• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    The present invention discloses a red clay phosphorus adsorbent, including 115-145 parts 5 of red clay particle, 20-30 parts of diatomite, 10-15 parts of glass powder and 3-10 of marble powder. The preparation process comprises preparing red clay particles, weighing raw materials, crushing, calcining, mixing, etc. Red clay has good adsorption property for phosphorus, has the characteristics of rich resources, wide distribution range and low costs. Meanwhile, as a natural environment-friendly material, red clay may not cause secondary pollution and other problems 10 when being thrown into wastewater, thereby having great development potential in the aspect of adsorption of phosphorus.
    公开号:NL2025922A
    申请号:NL2025922
    申请日:2020-06-25
    公开日:2021-04-26
    发明作者:Hang Xiaoshuai；Wang Wei；Zhang Lei；You Xiaohui；Zhu Dongdong；Ding Chengcheng；Cui Yibin；Chen Yudong；He Fei；Zhuang Wei；Chao Jianying
    申请人:Mini Of Ecology And Environment；
    IPC主号:
    专利说明:

    RED CLAY PHOSPHORUS ABSORBENT, PREPARATION METHOD AND APPLICATION
    THEREOF Technical Field The present invention relates to the technical field of phosphorus adsorption materials, and more particularly to a red clay phosphorus absorbent, and preparation method and application thereof. Background In recent years, the phenomenon of eutrophication has intensified, which has become a problem in water environment management. Phosphorus is the main factor leading to eutrophication. Therefore, reducing emissions of phosphorus is the key to controlling eutrophication. At present, the methods of removing phosphorus in wastewater can be divided into 3 categories: physical method, chemical method and biological method. The physical method has the defect of poor treatment effect and the biological method has the defect of difficult operation, thereby being limited in practical application. At present, the most widely used method at home and abroad is the chemical method of removing phosphorus. The adsorption method, as a frequently-used chemical method of removing phosphorus, has attracted much attention because of economy and efficiency in recent years, and the development and study of efficient and cheap phosphorus adsorption materials have become the hot topic of research on the adsorption method.
    As a land resource, red clay is widely distributed in tropical and subtropical regions, but has poor fertility and poor productivity, is not suitable for crop growth, and may cause low crop yield. However, red clay has high clay particle content, is rich in oxides such as iron, aluminum and the like, and has high adsorption and fixation capacity especially for phosphorus. At present, the focus at home and abroad is mainly on the study on fixation and release of phosphorus in soil by red clay and the influencing factors thereof, but there are still few reports on the use of red clay as an adsorption material and use of same as an adsorbent for phosphorus in polluted water.
    Therefore, the problem to be urgently solved by those skilled in the art is how to prepare red clay into a phosphorus absorbent and use the absorbent to adsorb phosphorus in wastewater. Summary In view of this, the present invention provides a red clay phosphorus absorbent, and preparation method and application thereof. Red clay has good adsorption property for phosphorus, has the characteristics of rich resources, wide distribution range and low costs. Meanwhile, as a natural environment-friendly material, red clay may not cause secondary pollution and other problems when being thrown into wastewater, thereby having great development potential in the aspect of adsorption of phosphorus.
    To achieve the above purpose, the present invention adopts the following technical solution: A red clay phosphorus absorbent, comprising the components of the following parts by weight: 115-145 parts of red clay particle, 20-30 parts of diatomite, 10-15 parts of glass powder and 3-10 of marble powder.
    The technical solution has the technical effects that: red clay has good adsorption property for phosphorus, is suitable for adsorbing phosphorous in natural water and wastewater, has the characteristics of rich sources, wide distribution range and low costs, and as a natural environment-friendly material, red clay may not cause secondary pollution. Marble decomposes and foams during calcination, so that each diatomite and glass powder has a loose and porous structure, thereby enhancing the adsorption capacity thereof for phosphorus.
    As a preferred technical solution of the present invention, the red clay phosphorus adsorbent further comprises the component of the following parts by weight: 5-10 parts of sodium borate.
    A preparation method of the red clay phosphorus absorbent, comprising the following steps: step 1: preparing red clay particles: preparing red clay particles by using southern natural red clay as a raw material; step 2: weighing raw materials: weighing diatomite, glass powder, marble powder and sodium borate according to the above parts by weight, and uniformly mixing the weighed raw materials, to obtain a mixture; step 3: crushing and calcining: drying and crushing the mixture obtained in the step 2 into 200-300 meshes, and calcining the crushed raw material, to obtain an adsorption ingredient; and step 4: mixing: mixing the red clay particles prepared in the step 1 with the adsorption ingredient according to a weight part ratio, to obtain a phosphorus absorbent.
    The technical solution has the technical effect that: the marble, diatomite, sodium borate and glass powder are mixed and then calcined, the marble is decomposed by being heated to produce CO:, so a loose porous structure is formed on the surface of the glass powder, diatomite and sodium borate, and then the adsorption property thereof for phosphorus and other heavy metals is enhanced.
    As a preferred technical solution of the present invention, in the step 1, the specific process of preparing red clay particles by using red clay as a raw material comprises: (1) roughing natural red clay, and selecting red clay with clay particle and iron-aluminum oxide content of 35-60%; (2) crushing and refining the red clay roughed in the step (1), and separating clay particles with a particle size of 0.1-2 um; and (3) drying and crushing the clay particles obtained in the step (2), sieving the crushed clay particles with a sieve of 100 meshes, placing the sieved clay particles into a thermal reactor, roasting for 1-2 h at 200-800°C, taking out the roasted clay particle after roasting, cooling the roasted clay particles at room temperature, crushing the cooled clay particles, and thus obtaining red clay particles.
    The technical solution has the technical effect that: by only simply refining and roasting natural red clay, efficient phosphorus adsorption particles can be obtained, the whole preparation process is simple, the production cost is low, and the soil components with large particle size produced during the production process can be used for backfilling without generating waste.
    As a preferred technical solution of the present invention, in the step (2), the red clay is refined with a magnetic stirrer; the specific process of refinement includes: mixing red clay with water according to the volume ratio of 1: 3-5, stirring for gravitational settling, and screening upper layer of clay particles, i.e. refined clay.
    As a preferred technical solution of the present invention, in the step (3), before roasting, the clay particles are crushed to a fineness of 70-80 meshes.
    As a preferred technical solution of the present invention, in the step (3), after roasting, the clay particles are crushed to a fineness of 200-300 meshes.
    As a preferred technical solution of the present invention, the process of calcining the raw material in the step 3 comprises the following steps: raising the temperature to 400-500°C at a temperature rising rate of 10-15°C/min, and keeping the temperature for 20-30 min; raising the temperature to 1000-1100°C at a temperature rising rate of 10-15°C/min, and keeping the temperature for 10-20 min; reducing the temperature to 800-900°C at a temperature reducing rate of 20-30°C/min; and naturally cooling to normal temperature to obtain an adsorption ingredient.
    As a preferred technical solution of the present invention, in the step 2 to step 3, crushing is performed with a pulverizer.
    An application of the red clay phosphorus absorbent in the aspect of adsorbing phosphorus in wastewater.
    The technical solution has the technical effect that: at present, the focus at home and abroad is mainly on the study on fixation and release of phosphorus in soil by red clay and the influencing factors thereof, but there is no report on the use of red clay to adsorb phosphorus in water. Thus, the technical solution provides a new use of red clay and provides theoretical support for the development of the property of red clay.
    It can be known from the above technical solution that compared with the prior art, the present invention discloses and provides a red clay phosphorus absorbent, and preparation method and application thereof, and has the following technical effects: 1} In the present invention, red clay with specific components is used as a raw material, which is rich in resource and widely distributed, so the cost of the raw material is basically ignored.
    2) The red clay, diatomite, and marble as raw materials of the adsorbent in the present invention are natural environment-friendly materials, and thus may not cause secondary pollution and other adverse effects on the environment in the treatment process.
    3) By only simply refining and roasting natural red clay, an efficient phosphorus adsorbent can be obtained. The whole preparation process is simple, the production cost is low, and the soil components with large particle size produced in the production process can be used for backfilling without generating waste.
    4) The adsorbent has a wide application range and can be used to remove phosphorus in natural water, breeding wastewater and other fields. The adsorbent has excellent adsorption effect on the phosphorus in the solution; the adsorbent has a high concentration of phosphorus after adsorption and can be used as a raw material of compound fertilizer or phosphorus-rich nutritional soil, so resource reuse can be realized.
    Description of Drawings To describe the technical solution more clearly in the embodiments of the present invention or in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be simply presented below. Apparently, the drawings in the following description are merely the embodiments of the present invention, and for those ordinary skilled in the art, other drawings can also be obtained according to the provided drawings without contributing creative labor.
    Fig. 1 is a diagram showing the effect of performing a phosphorus adsorption test using different adsorption material as a phosphorus adsorbent in embodiment 6; Fig. 2 is a diagram showing the effect of performing a phosphorus adsorption test using natural red clay (NS), refined red clay (WS) particles and activated carbon in embodiment 7; Fig. 3 is a diagram showing the change in the concentration of phosphorus in the solution when natural red clay (NS) and refined red clay (WS) particles are used as raw material to prepare a phosphorus adsorbent for phosphorus adsorption test in embodiment 8; Fig. 4 is a diagram showing the change in the adsorption amount of phosphorus when natural red clay (NS) and refined red clay (WS) particles are used as raw materials to prepare a phosphorus adsorbent for phosphorus adsorption test in embodiment 9; Fig. 5 is a diagram showing the relationship between the concentration of adsorbed phosphorus and the original pH of the solution if the original phosphorus concentration is 35mg/L when natural red clay (NS) and refined red clay (WS) particles are used as raw material to prepare a phosphorus adsorbent for phosphorus adsorption test in embodiment 10; and Fig. 6 is a diagram showing the relationship between the concentration of adsorbed phosphorus and the original pH of the solution if the original phosphorus concentration is 50mg/L when natural red clay (NS) and refined red clay (WS) particles are used as raw material to prepare a phosphorus adsorbent for phosphorus adsorption test in embodiment 10.
    Detailed Description The technical solution in the embodiments of the present invention will be clearly and fully described below in combination with the drawings in the embodiments of the present invention. Apparently, the described embodiments are merely part of the embodiments of the present 5 invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those ordinary skilled in the art without contributing creative labor will belong to the protection scope of the present invention.
    In each of embodiments 1-5 of the present invention, crushing is performed with a pulverizer, and the pulverizer is a MKL-QL jet pulverizer; and the magnetic stirrer is a HS-350C magnetic stirrer.
    Embodiment 1 A preparation method of the red clay phosphorus absorbent, comprising the following steps: Step 1: preparing red clay particles: (1) using southern natural red clay as a raw material, roughing the natural red clay, and selecting red clay with clay particle and iron-aluminum oxide content of 35-45%; (2) crushing the red clay roughed in the step (1) with a pulverizer and refining same with a magnetic stirrer, and separating clay particles with a particle size of 0.5-2 um, wherein the specific process of refinement includes: mixing red clay with water according to the volume ratio of 1:3, stirring with the magnetic stirrer, and screening upper layer of clay particles with a particle size of
    0.5-2 um; and (3) drying and crushing the clay particles obtained in the step (2) into a fineness of 70 meshes, sieving the crushed clay particles with a sieve of 100 meshes, placing the sieved clay particles into a thermal reactor, roasting for 1 h at 200°C, taking out the roasted clay particles after roasting, cooling the roasted clay particles at room temperature, crushing the cooled clay particles into a fineness of 200 meshes, and thus obtaining red clay particles.
    Step 2: weighing raw materials: weighing 20 parts of diatomite, 10 parts of glass powder, and 3 parts of marble powder, and mixing the weighed raw materials, to obtain a mixture.
    Step 3: crushing and calcining: drying and crushing the mixture obtained in the step 2 into 200 meshes, calcining the crushed raw material, raising the temperature to 400°C at a temperature raising rate of 10°C/min during calcining, and keeping the temperature for 20 min; raising the temperature to 1000°C at a temperature rising rate of 10°C/min, and keeping the temperature for 10-20 min; reducing the temperature to 800°C at a temperature reducing rate of 20°C/min, and naturally cooling to normal temperature to obtain an adsorption ingredient.
    Step 4: mixing: weighing 115 parts of the red clay particles prepared in the step 1 and mixing same with the adsorption ingredient, to obtain a red clay phosphorus absorbent.
    Embodiment 2 A preparation method of the red clay phosphorus absorbent, comprising the following steps: Step 1: preparing red clay particles: (1) using southern natural red clay as a raw material, roughing the natural red clay, and selecting red clay with clay particle and iron-aluminum oxide content of 46%-50%; (2) crushing the red clay roughed in the step (1) with a pulverizer and refining same with a magnetic stirrer, and separating clay particles with a particle size of 0.1-0.5 um, wherein the specific process of refinement includes: mixing red clay with water according to the volume ratio of 1:4, stirring with the magnetic stirrer, and screening upper layer of clay particles with a particle size of 0.1-0.5 ym; and (3) drying and crushing the clay particles obtained in the step (2) into a fineness of 80 meshes, sieving the crushed clay particles with a sieve of 100 meshes, placing the sieved clay particles into a thermal reactor, roasting for 2 h at 800°C, taking out the roasted clay particles after roasting, cooling the roasted clay particles at room temperature, crushing the cooled clay particles into a fineness of 300 meshes, and thus obtaining red clay particles.
    Step 2: weighing raw materials: weighing 30 parts of diatomite, 15 parts of glass powder, 10 parts of marble powder, and 10 parts of sodium borate, and mixing the weighed raw materials, to obtain a mixture; step 3: crushing and calcining: drying and crushing the mixture obtained in the step 2 into 300 meshes, calcining the crushed raw material, raising the temperature to 500°C at a temperature raising rate of 15°C/min during calcining, and keeping the temperature for 30 min; raising the temperature to 1100°C at a temperature rising rate of 15°C/min, and keeping the temperature for 20 min; reducing the temperature to 900°C at a temperature reducing rate of 30°C/min; and naturally cooling to normal temperature to obtain an adsorption ingredient.
    Step 4: mixing: weighing 145 parts of the red clay particles prepared in the step 1 and mixing same with the adsorption ingredient, to obtain a red clay phosphorus absorbent.
    Embodiment 3 A preparation method of the red clay phosphorus absorbent, comprising the following steps: Step 1: preparing red clay particles: (1) using southern natural red clay as a raw material, roughing the natural red clay, and selecting red clay with clay particle and iron-aluminum oxide content of 51-52%; (2) crushing the red clay roughed in the step (1) with a pulverizer and refining same with a magnetic stirrer, and separating clay particles with a particle size of 0.5-1 um, wherein the specific process of refinement includes: mixing red clay with water according to the volume ratio of 1:5, stirring with the magnetic stirrer, and screening upper layer of clay particles with a particle size of
    0.5-1 um; and
    (3) drying and crushing the clay particles obtained in the step (2) into a fineness of 75 meshes, sieving the crushed clay particles with a sieve of 100 meshes, placing the sieved clay particles into a thermal reactor, roasting for 1.5 h at 400°C, taking out the roasted clay particles after roasting, cooling the roasted clay particles at room temperature, crushing the cooled clay particles into a fineness of 230 meshes, and thus obtaining red clay particles.
    Step 2: weighing raw materials: weighing 25 parts of diatomite, 12 parts of glass powder, 6 parts of marble powder, and 8 parts of sodium borate, and mixing the weighed raw materials, to obtain a mixture; Step 3: crushing and calcining: drying and crushing the mixture obtained in the step 2 into 230 meshes, calcining the crushed raw material, raising the temperature to 450°C at a temperature raising rate of 12°C/min during calcining, and keeping the temperature for 25 min; raising the temperature to 1050°C at a temperature rising rate of 12°C/min, and keeping the temperature for 15 min; reducing the temperature to 850°C at a temperature reducing rate of 25°C/min; and naturally cooling to normal temperature to obtain an adsorption ingredient.
    Step 4: mixing: weighing 125 parts of the red clay particles prepared in the step 1 and mixing same with the adsorption ingredient, to obtain a red clay phosphorus absorbent.
    Embodiment 4 A preparation method of the red clay phosphorus absorbent, comprising the following steps: Step 1: preparing red clay particles: (1) using southern natural red clay as raw material, roughing the natural red clay, and selecting red clay with clay particle and iron-aluminum oxide content of 53-55%; (2) crushing the red clay roughed in the step (1) with a pulverizer and refining same with a magnetic stirrer, and separating clay particles with a particle size of 1.5-2 um, wherein the specific process of refinement includes: mixing red clay with water according to the volume ratio of 1:4.5, stirring with the magnetic stirrer, and screening upper layer of clay particles with a particle size of
    1.5-2 um; and (3) drying and crushing the clay particles obtained in the step (2) into a fineness of 80 meshes, sieving the crushed clay particles with a sieve of 100 meshes, placing the sieved clay particles into a thermal reactor, roasting for 1.3 h at 500°C, taking out the roasted clay particles after roasting, cooling the roasted clay particles at room temperature, crushing the cooled clay particles into a fineness of 250 meshes, and thus obtaining red clay particles.
    Step 2: weighing raw materials: weighing 27 parts of diatomite, 14 parts of glass powder, 9 parts of marble powder, and 7 parts of sodium borate, and mixing the weighed raw materials, to obtain a mixture; Step 3: crushing and calcining: drying and crushing the mixture obtained in the step 2 into 250 meshes, calcining the crushed raw material, raising the temperature to 460°C at a temperature raising rate of 13°C/min during calcining, and keeping the temperature for 27 min;
    raising the temperature to 1070°C at a temperature rising rate of 13°C/min, and keeping the temperature for 17 min; reducing the temperature to 810°C at a temperature reducing rate of 26°C/min; and naturally cooling to normal temperature to obtain an adsorption ingredient.
    Step 4: mixing: weighing 135 parts of the red clay particles prepared in the step 1 and mixing same with the adsorption ingredient, to obtain a red clay phosphorus absorbent.
    Embodiment 5 A preparation method of the red clay phosphorus absorbent, comprising the following steps: Step 1: preparing red clay particles: (1) using southern natural red clay as raw material, roughing the natural red clay, and selecting red clay with clay particle and iron-aluminum oxide content of 56-60%; (2) crushing the red clay roughed in the step (1) with a pulverizer and refining same with a magnetic stirrer, and separating clay particles with a particle size of 1-2 um, wherein the specific process of refinement includes: mixing red clay with water according to the volume ratio of 1:3.5, stirring with the magnetic stirrer, and screening upper layer of clay particles with a particle size of 1-2 um; and (3) drying and crushing the clay particles obtained in the step (2) into a fineness of 70 meshes, sieving the crushed clay particles with a sieve of 100 meshes, placing the sieved clay particles into a thermal reactor, roasting for 1.7 h at 600°C, taking out the roasted clay particles after roasting, cooling the roasted clay particles at room temperature, crushing the cooled clay particles into a fineness of 270 meshes, and thus obtaining red clay particles.
    Step 2: weighing raw materials: weighing 28 parts of diatomite, 11 parts of glass powder, 8 parts of marble powder, and 6 parts of sodium borate, and mixing the weighed raw materials, to obtain a mixture; Step 3: crushing and calcining: drying and crushing the mixture obtained in the step 2 into 270 meshes, calcining the crushed raw material, raising the temperature to 480°C at a temperature raising rate of 14°C/min during calcining, and keeping the temperature for 22 min; raising the temperature to 1080°C at a temperature rising rate of 11°C/min, and keeping the temperature for 14 min; reducing the temperature to 870°C at a temperature reducing rate of 22°C/min; and naturally cooling to normal temperature to obtain an adsorption ingredient.
    Step 4: mixing: weighing 140 parts of the red clay particles prepared in the step 1 and mixing same with the adsorption ingredient, to obtain a red clay phosphorus absorbent.
    Embodiment 6 Using activated carbon as a phosphorus absorbent for phosphorus absorption test, as control group; Directly using natural red clay sieved with a sieve of 100 meshes as a phosphorus absorbent for phosphorus absorption test, as test group 1;
    Replacing natural red clay with kaolin, sieving with a sieve of 100 meshes, conducting a phosphorus absorption test, as test group 2; Replacing natural red clay with attapulgite clay, sieving with a sieve of 100 meshes, conducting a phosphorus absorption test, as test group 3; Replacing natural red clay with bentonite, sieving with a sieve of 100 meshes, conducting a phosphorus absorption test, as test group 4; Replacing natural red clay with zeolite, sieving with a sieve of 100 meshes, conducting a phosphorus absorption test, as test group 5; Respectively taking 4g of the above 6 kinds of adsorbents and placing them in multiple 250mL conical flasks, placing each kind of absorbent into two conical flasks, respectively adding 100mL of phosphorus-containing solution with a phosphorus concentration of 35mg/L and 100mL of phosphorus-containing solution with a phosphorus concentration of 50mg/L into the conical flasks containing identical absorbent, sealing and placing the conical flasks in a constant- temperature oscillator, and shaking for 2h at constant temperature at the revolving speed of 200r/min; after reaction, centrifuging at 4000r/min for 5min in a tabletop centrifuge, taking the supernatant and filtering with a microporous membrane of 0.45 pm, and measuring the concentration of phosphorus in the residual solution.
    The test results are shown in Fig. 1. Red clay has good efficiency of removing phosphorus in solutions with initial concentrations of 35mg/L and 50mg/L, which is significantly higher than that of kaolin, attapulgite clay, bentonite and zeolite.
    The removal rates for red clay to remove phosphorous in the solutions with initial concentrations of 35mg/L and 50mg/L are 79.2% and 73.5% respectively, which are slightly lower than that of activated carbon, the removal rates for activated carbon to remove phosphorus in the solutions with initial concentrations of 35mg/L and 50mg/L are 85.3% and 79.6% respectively.
    Embodiment 7 Respectively taking 4g of natural red clay (NS) sieved with a sieve of 100 meshes, refined red clay (WS) particles prepared in the step 1 of embodiment 4, and activated carbon and placing them into multiple groups of 250mL conical flasks, respectively adding 100mL of phosphorus- containing solution with a phosphorus concentration of 35mg/L and 100mL of phosphorus- containing solution with a phosphorus concentration of 50mg/L (calculated as P) into the conical flasks, and conducting a phosphorus absorption test (the process is the same as that in embodiment 6); respectively recording as test group 1, test group 2 and control group.
    The test results are shown in Fig. 2. The removal rates for the refined red clay (WS) to remove phosphorous in the solutions with the initial concentrations of phosphorus of 35mg/L and 50mg/L are obviously increased respectively, i.e. increased by 9.1% and 3.5% respectively, equivalent to the removal effect of activated carbon.
    Embodiment 8 Taking natural red clay sieved with a sieve of 100 meshes, and mixing the natural red clay sieved with a sieve of 100 meshes with other raw materials according to the methods in step 3 to step 4 directly in accordance with the method in embodiment 4 without being treated as in the step 1 of embodiment 4 and preparing a phosphorus adsorbent for phosphorus adsorption test, as test group 1; and using the phosphorus absorbent prepared in embodiment 4 for phosphorus absorption test, as control group.
    The test process is as follows: Respectively taking 4g of phosphorus adsorbent from each group and placing them in 3 groups of 250mL conical flasks, each group including two 250mL conical flasks, respectively adding 100mL of simulated phosphorus-containing wastewater with a phosphorus concentration of 35mg/L and 100mL of simulated phosphorus-containing wastewater with a phosphorus concentration of 50mg/L (calculated as P) into each group of conical flasks, shaking for 5min-24h at constant temperature, and conducting a phosphorus adsorption test (refer to embodiment 6 for other conditions). The results are shown in Fig. 3. As shown in Fig. 3, the reaction time is 5min- 2h. The removal rates for the test group 1 (that uses natural red clay as raw material) and the control group (that uses the refined red clay particles as raw material) to remove phosphorous in the solutions with initial concentrations of 35mg/L and 50mg/L are continually increased over time.
    Wherein, at 2h, the removal rates for the test group 1 to remove phosphorous in the solutions with initial concentrations of 35mg/L and 50mg/L reach 82.2% and 76.5% respectively, while the removal rates for the control group to remove phosphorous reach 91.4% and 82.1%. With the increase of shaking time after 2h, the removal rate is not increased significantly, tending to be balanced.
    Embodiment 9 Taking natural red clay sieved with a sieve of 100 meshes, and mixing the natural red clay sieved with a sieve of 100 meshes with other raw materials according to the methods in step 3 to step 4 directly in accordance with the method in embodiment 4 without being treated as in the step 1 of embodiment 4 and preparing a phosphorus adsorbent for phosphorus adsorption test, as test group 1; and using the phosphorus absorbent prepared in embodiment 4 for phosphorus absorption test, as control group. The phosphorus adsorption test process is the same as that in embodiment 6. The results are shown in Fig. 4. The adsorption amounts of phosphorus adsorbed by the test group 1 and control group are continually increased with the increase of the initial solution phosphorus concentration. When the initial solution phosphorus concentration reaches 450 mg/L, the adsorption amounts of phosphorus adsorbed by the test group 1 and the control group basically reach the maximum, which are 2.83 mg/g and 3.21 mg/g, respectively.
    As the initial solution phosphorus concentration continues to increase, the adsorption amounts are not increased any longer.
    Embodiment 10 Taking natural red clay sieved with a sieve of 100 meshes, and mixing the natural red clay sieved with a sieve of 100 meshes with other raw materials according to the methods in step 3 to step 4 directly in accordance with the method in embodiment 4 without being treated as in the step 1 of embodiment 4 and preparing a phosphorus adsorbent for phosphorus adsorption test, as test group 1; and using the phosphorus absorbent prepared in embodiment 4 for phosphorus absorption test, as control group.
    Respectively taking 4g of phosphorus adsorbent from each group and placing them in 3 groups of 250mL conical flasks, each group including two 250mL conical flasks, respectively adding 100mL of simulated phosphorus-containing wastewater with a phosphorus concentration of 35mg/L and 100mL of simulated phosphorus-containing wastewater with a phosphorus concentration of 50mg/L (calculated as P) into each group of conical flasks, adjusting the initial solution pH to 3.5-10.5 by means of hydrochloric acid and sodium hydroxide, and conducting a phosphorus adsorption test (refer to embodiment 6 for the steps and conditions of absorption test). The results are shown in Figs. 5-6. The removal rates for the test group 1 and the control group to remove phosphorous in the solutions with initial concentrations of 35mg/L and 50mg/L are gradually reduced with increase of pH.
    For the test group 1 and the control group, when the initial solution phosphorus concentration is 35 mg/L, the removal rates for the test group 1 and the control group to remove phosphorous are reduced from 91.4% and 94.3% at pH 3.5 to 43.8% and 55.5% at pH 10, respectively.
    When the initial solution phosphorus concentration is 50 mg/L, the removal rates for the test group 1 and the control group to remove phosphorous are reduced from 85.0% and 85.8% at pH 3.5 to 35.9% and 47.6% at pH 10, respectively.
    Each embodiment in the description is described in a progressive way.
    The difference of each embodiment from each other is the focus of explanation.
    The same and similar parts among all of the embodiments can be referred to each other.
    For the device disclosed by the embodiments, because the device corresponds to a method disclosed by the embodiments, the device is simply described.
    Refer to the description of the method part for the related part.
    The above description of the disclosed embodiments enables those skilled in the art to realize or use the present invention.
    Many modifications to these embodiments will be apparent to those skilled in the art.
    The general principle defined herein can be realized in other embodiments without departing from the spirit or scope of the present invention.
    Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principle and novel features disclosed herein
    权利要求:
    Claims (10)
    [1]
    A red clay - phosphorus absorbent, comprising: 115 - 145 parts by weight of red clay particles, 20 - 30 parts by weight of diatomite, - 15 parts by weight of glass powder and 3 - 10 parts by weight of marble powder.
    [2]
    The red clay phosphorus absorbent of claim 1, further comprising 5-10 parts by weight of sodium borate.
    [3]
    A method of preparing the red clay - phosphorus absorbent according to claim 1 or 2, comprising the steps of: step 1: preparing red clay particles by using southern natural red clay as a raw material; step 2: weighing the raw materials according to the above weight ratios and evenly mixing the weighed raw materials to obtain a mixture; step 3: drying and grinding the mixture obtained in step 2 to 200-300 mesh and annealing the ground raw material to obtain an adsorption component; and step 4: mixing the red clay particles prepared in step 1 with the adsorption component according to the above weight ratios, to obtain the phosphorus absorbent.
    [4]
    The method of preparing the red clay phosphorus absorbent according to claim 3, wherein step 1 comprises: (1) roughening natural red clay and selecting red clay particles having an iron alumina content of 35-60%; (2) grinding and refining the red clay roughened in step 1 and separating clay particles with a particle size of 0.1-2 µm, and (3) drying and grinding the clay particles obtained in step (2), sieving the crushed clay particles with a 100 mesh sieve, placing the sieved clay particles in a thermal reactor, roasting for 1 - 2 hours at 200 - 800 ° C, removing the roasted clay particles after roasting, cooling the roasted clay particles at room temperature, grinding the cooled clay particles to obtain the red clay particles.
    [5]
    The method of preparing the red clay - phosphorus absorbent according to claim 4, wherein in step (2) the red clay is refined with a magnetic stirrer.
    [6]
    The method of preparing the red clay - phosphorus absorbent according to claim 4, wherein the clay particles are ground to a fineness of 70-80 mesh in step (3) prior to roasting.
    [7]
    The method of preparing the red clay phosphorus absorbent according to claim 4, wherein the clay particles are ground to a fineness of 200-300 meshes after roasting in step (3).
    [8]
    The method of preparing the red clay phosphorus absorbent according to claim 4, wherein in step (3) the specific annealing process of the raw material is performed: increasing the temperature to 400-500 ° C with a temperature rise rate of 10- 15 ° C / min, and maintaining the temperature for 20-30 minutes; raising the temperature to 1000-1100 ° C at a temperature rise rate of 10-15 ° C / min, and maintaining the temperature for 10-20 minutes; reducing the temperature to 800-900 ° C at a temperature reduction rate of 20-30 ° C / min; and allowed to cool naturally to a normal temperature to obtain the adsorption component.
    [9]
    The method of preparing the red clay phosphorus absorbent according to any of claims 3-7, wherein the grinding in steps 2 and 3 is performed with a pulverizer.
    [10]
    Use of the red clay phosphorus absorbent according to claim 1 or 2 for adsorbing phosphorus in waste water.
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