![]() Slime water concentration system with concentration detection function and concentration detection m
专利摘要:
The present invention belongs to the technical field of slime water treatment, and particularly relates to a slime water concentration system with a concentration detection function and a concentration detection method thereof. The system comprises weight detection assemblies, the weight detection assembly comprises a slime water feeding pipe, a sampling pipe and a slime water discharging pipe which are sequentially arranged along the advancing path of slime water, the slime water feeding pipe is communicated with a concentration tank, and the two ends of the sampling pipe are fixedly connected and communicated with the slime water feeding pipe and the slime water discharging pipe through flexible connecting pipes respectively; the weight detection assembly further comprises a weighing sensor and a drainage valve or a drainage pump; and more than two groups of weight detection assemblies are sequentially arranged along the height direction of the concentration tank. According to the system, the real-time concentrations of slime water at different heights can be obtained by monitoring the real-time weights of slime water samples taken at different heights, the detection process is simple, convenient and rapid, and the detection result is high in reliability, accurate and stable. The invention further provides a concentration detection method so as to further improve the convenience of the detection process. 公开号:NL2027665A 申请号:NL2027665 申请日:2021-02-26 公开日:2021-10-20 发明作者:Zhang Yong;Zhu Hongzheng;Han Mingyue 申请人:Univ Anhui Sci & Technology; IPC主号:
专利说明:
SLIME WATER CONCENTRATION SYSTEM WITH CONCENTRATIONDETECTION FUNCTION AND CONCENTRATION DETECTION METHODTHEREOF TECHNICAL FIELD The present invention belongs to the technical field of slime water treatment, and particularly relates to a slime water concentration system with concentration detection function and a concentration detection method thereof. BACKGROUND Coal is the main energy in China, accounting for more than 70% of primary energy consumption. For a long period of time, the status of coal as the main energy source will not change. Due to the geological structure and mining methods, a large number of gangue are inevitably mixed after coal mining. This gangue has high ash content, high sulfur content and low calorific value, which greatly adversely affects the clean utilization of the coal. At present, the main solution is coal separation. The main separation method of traditional coal is wet separation, and the coal preparation method is divided into desliming selection and non- desliming selection according to whether desliming is performed before selection. No matter which way is adopted, the treatment of the slime water in a coal preparation plant is a big problem in the coal preparation plant production, and even becomes an obstacle to improve quality and increase efficiency in a coal preparation plant. The treatment of the slime water in a coal preparation plant mainly includes five stages: classification concentration, separation, desliming dehydration, sedimentation and filtration dehydration. In the above stages, due to the fine particle size of the coal slime, the sedimentation process is affected by buoyancy, mutual collision resistance, gravity and water impact force, and its sedimentation process is complex and slow, so it is usually necessary to build a large concentration tank as the equipment for coal slime sedimentation, so the effect of the slime sedimentation is the key factor to measure the working efficiency of coal slime water treatment system. As the slime water gradually settles to the bottom of the concentration tank, it is necessary to monitor the settling speed during the settling process, and determine the dosage of the coagulant and fiocculant according to the settling speed, and the settling speed can be fed back through the concentration at different heights. Ultrasonic interface instrument is mostly used in traditional detection to detect the concentration of the slime water. Ultrasonic interface instrument requires a clear interface between solid and liquid, which leads to inaccurate and large errors in monitoring the sedimentation effect of the coal slime in a concentration tank by existing detection methods, and brings many troubles to actual detection work. SUMMARY One of the aims of the present invention is to overcome the shortcomings of the prior art and provide a slime water concentration system with a reasonable and compact structure and a concentration detection function, which can obtain the real-time concentration of the slime water at different heights by monitoring the real-time weight of slime water samples taken at different heights, and the detection process is simple and fast, and the detection result is highly reliable, accurate and stable; another object of the present invention is to provide a concentration detection method applied to the slime water concentration system with the concentration detection function, so as to further improve the convenience of the detection process. In order to achieve the above purpose, the invention adopts the following technical solution: A slime water concentration system with concentration detection function, comprising a concentration tank; wherein, the system further comprises a weight detection component which comprises a slime water feeding pipe, a sampling pipe and a slime water discharging pipe which are sequentially arranged along a slime water traveling path; the slime water feeding pipe is communicated with the concentration tank, and both ends of the sampling pipe are respectively fixedly connected and communicated with the slime water feeding pipe and the slime water discharging pipe through flexible connecting pipes; the weight detection component further comprises a weighing sensor for weighing a real-time weight of the sampling pipe and a drainage valve or a drainage pump for timely discharging the weighed slime water in the sampling pipe; there are more than two groups of the weight detection component which are arranged in sequence along a height direction of the concentration tank. Preferably, the slime water feeding pipe of the weight detection component located at a highest position is communicated with an overflow weir of the concentration tank. Preferably, the flexible connecting pipe is a corrugated hose, and a connecting rod is fixedly connected to the sampling pipe, and the connecting rod extends vertically upward and is fixedly connected with a sensing end of the weighing sensor. Preferably, the drainage valve is an electromagnetic valve, and the slime water discharge pipe is communicated with a slime water inlet of the concentration tank. Preferably, the system further comprises a flocculant dosing component and a coagulant dosing component; the flocculant dosing component and coagulant dosing component both comprise a dosing and stirring barrel, and medicines or medicinal powders enter a barrel cavity of the dosing and stirring barrel through a medicine feeder and a feeding conveyor belt at a medicine storage part in sequence, and a water feeding pipe for feeding water is arranged at the dosing and stirring barrel; a water feeding pipe for feeding water and a stirring component for mixing medicines in the cavity of the stirring barrel are also arranged at the dosing and stirring barrel; medicine discharge pipes of the dosing and stirring barrels of the flocculant dosing component and the coagulant dosing component are communicated with the slime water inlet and then communicated with the concentration tank; the stirring component comprises a stirring motor, a power output shaft of the stirring motor extends vertically downwards and stirring blades are arranged on the power output shaft; each set of the stirring blades comprises an upper blade plate and a lower blade plate which are arranged in parallel with each other, and an inclined cotyledon plate is convexly arranged at a lower plate surface of the upper blade plate in the direction towards the lower blade plate; there is an included angle between a plate surface of the inclined cotyledon board and that of the upper blade plate, and there is a distance between the inclined cotyledon board and the lower blade plate in the height direction. Preferably, the stirring blades present a curved and twisted structure bent upward or downward as a whole, and in the height direction, more than one group of adjacent stirring blades is taken as one group of stirring layers, and the bending directions of the stirring blades of two adjacent groups of stirring layers are opposite to each other. A concentration detection method using the slime water concentration system with concentration detection function, comprising the following steps: preparing the slime water using water and slime, with a density of water being p1 and a density of slime being p 2; and taking slime water samples on site, and centrifuging the samples at a high speed in a laboratory centrifuge to obtain water samples and coal slime samples at the bottom, and measuring densities thereof respectively to obtain pt and p2 values; wherein, a volume v is known, and correction of the volume v is completed through a first correction; the specific process is as follows: an actual concentration in the sampling pipe at any group of the weight detection components is measured in advance, and then the measured weight is displayed in the weight detection component at this time, thus obtaining the volume v of the slime water sample in any group of the weight detection components; assuming that weight values in the sampling pipe which can be obtained from top to bottom are x1, x2, x3, x4..., concentration values to be obtained are m1, m2, m3, m4...; the actual values of m1, m2, m3, m4...can be obtained through the following formulas: xt=mtvpt+{1-m1)vp2 x2=m2*v 'pt+{1-m2)v*p2 x3=m3*v*pi+{1-m3)*'v'p2 x4=mdv'pi+{1-m4)vp2 The method has the following beneficial effects: 1} accord to the present invention, the weight detection components are arranged at different heights on the side surface of the concentration tank, so that slime water with different heights can be taken out from the concentration tank body respectively. Taking one of them as an example, the slime water enters one of the sampling pipes through the flexible connecting pipe, and the weight of slime water samples taken at different heights above and below the concentration tank can be obtained by the weighing sensor; because the concentration of the slime water sample below is higher than that above, the weight measured below is greater than that above. After the weight is obtained, the concentration of the slime water at the current height can be obtained by calculation, and then the dosage of coagulant and flocculant to be added can be calculated. The slime water in the sampling pipe can be timely updated by the drainage valve or pump, so that the real-time monitoring of the real-time weight of slime water samples taken at different heights can be realized, and then the real-time concentration of the slime water at different heights can be obtained. The detection process is simple and fast, and the detection result is highly reliable, accurate and stable. 2) Further, the slime water feeding pipe of the weight detection component 5 located at the highest position is communicated with the overflow weir of the concentration tank, so that the concentration change of the slime water at different heights can be more clearly confirmed, and the conversion result is more accurate. The flexible connecting pipe is a corrugated hose, and in actual use, the two ends of the sampling pipe can be directly fixed, or even the adjacent ends of the two groups of flexible connecting pipes can be extended oppositely and fixedly connected, and then the sampling pipe can be sheathed. On the one hand, the sampling pipe provides the slime water sample to accommodate the space, on the other hand, it serves as a hard carrier for the installation and measurement of the sensing end of the weighing sensor, so as to ensure the stability and reliability of the actual work. 3) Because the concentration of the slime water in the concentration tank changes in real time, or it is considered to take the average value from multiple sampling, or the sample of slime water after detection does not interfere with the subsequent sampling, the detected slime water should directly flow back to the slime water inlet through the drain valve to ensure the accuracy of the subsequent detection data of the weight detection component. 4) Further, the system is additionally provided with a flocculant dosing component and a coagulant dosing component; in this way, once the concentration of the slime water at different heights in the concentration tank is detected, the dosage of the coagulant and flocculant to be added can be calculated. Then, the coagulant, flocculant and slime water can be mixed into the concentration tank, which can realize automatic reagent adding operation and finally achieve the best effect of slime sedimentation. Because the concentration detection in the concentration tank is real-time, the addition of flocculant and coagulant should also be real-time without delay; obviously, the design of the stirring blade is the key to the dosing and stirring barrel and it must be able to get the water and the corresponding medicine in the first time to quickly achieve the purpose of mixing and stirring. On the one hand, the stirring blade itself is formed by matching the upper blade plate and the lower blade plate, and is matched with the inclined cotyledon plate, which is more conducive to the formation of turbulence effect, so that water and corresponding medicines can be mixed and stirred more quickly; on the other hand, each layer of the stirring blades presents a curved and twisted structure bent upward or downward as a whole, and in the height direction, more than one group of adjacent stirring blades is taken as one group of stirring layers, and the bending directions of the stirring blades of two adjacent groups of stirring layers are opposite to each other, which is more conducive to improving the actual stirring effect. BRIEF DESCRIPTION OF DRAWINGS Fig. 1 is a schematic diagram of the structure of the present invention; Fig. 2 is a matching state diagram of a concentration tank and a weight detection component; Fig. 3 is a schematic structural diagram of a flocculant adding component; Fig. 4 is a schematic structural diagram of a weight detection component; Fig. 5 is an arrangement state diagram of the stirring blades; Fig. 6 is a top view of fig. 5; Fig. 7 is a schematic diagram of the three-dimensional structure of the upper blade plate; Fig. 8 is a schematic diagram of the matching state of the inclined cotyledon plate and the upper leaf plate. The actual correspondence between each reference sign and part name of the present invention is as follows: a-PLC master control module b-weight measurement monitoring PLC sub-module c-flocculant monitoring PLC sub-module d-flocculant monitoring PLC sub-module e-medicine discharge pump 10-concentration tank 20-weight detection component 21-slime water feeding pipe 22-sampling pipe 23-slime water discharge pipe 24-drainage valve 25-flexible connecting pipe 26-connecting rod 27-weighing sensor 30-slime water inlet 40a-flocculant dosing component 40b-coagulant dosing component 41-dosing and stirring barrel 42a-medine storage part 42b-medicine dispenser 43-feeding conveyor belt 43a- weight sensor 43b-belt cleaner 44- water feeding pipe 44a-water inlet solenoid valve 45- stirring motor 46-stirring blade 46a- upper blade plate 46b- lower blade plate 46c- inclined cotyledon plate 47- liquid level meter DESCRIPTION OF EMBODIMENTS For convenience of understanding, the specific structure and working mode of the present invention are further described below with reference to Figs. 1-8. Referring to Figs. 1-8, the concrete structure of the present invention includes a concentration tank 10 with the concentration tank 10 as the core and provided with a weight detection component 20, a flocculant dosing component 40a and a coagulant dosing component 40b. Wherein, as shown in Figs. 2 and 4, the weight detection component 20 includes a slime water feeding pipe 21, a flexible connecting pipe 25, a sampling pipe 22 and a slime water discharge pipe 23 arranged in sequence. In actual assembly, the flexible connecting pipe 25 may be a separate soft pipe structure, such as a corrugated hose. The two ends of the flexible connecting pipe 25 are respectively fixed with the slime water feeding pipe 21 and the sampling pipe 22, and the slime water discharge pipe 23 and the sampling pipe 22, so as to form a circulation channel of slime water samples. Of course, it is also possible to extend the adjacent ends of the two groups of flexible connecting pipes 25 towards each other to form an integrated structure, and the sampling pipe 22 is directly sleeved on the extended ends of the flexible connecting pipes 25, thus forming the structure shown in Fig. 3, which can also realize the sampling detection function of the sampling pipe 22. It can be seen from the structure shown in Fig. 3 that a connecting rod 26 extends vertically upward from the outer wall of the sampling pipe 22, and the top end of the connecting rod 26 is fixedly connected with a weighing sensor 27 to obtain the weight of the slime water sample in the sampling pipe 22 in real time. After the sampling and weighing operation is completed, the slime water sample can be quickly discharged through the drain valve 24. If necessary, it may also be considered to add a controllable an on-off valve or on-off pump at the slime water feeding pipe 21, so as to realize the functions of quantitatively pumping and weighing slime water in the sampling pipe 22. At this time, a drainage pump is preferred to discharge slime water samples in the sampling pipe 22 in a timely manner, so as to follow up and detect new slime water samples later. For the flocculant dosing component 40a and coagulant dosing component 40b, their specific structures are shown in Fig. 1 and Figs. 3-6. The flocculant dosing component 40a and the coagulant dosing component 40b both include a dosing and stirring barrel 41, and a medicine dosing component and a water dosing component are arranged at the barrel mouth of the dosing and stirring barrel 41. The medicine dosing component comprises a feeding conveyor belt 43, and a weight sensor 43a is arranged below the upper belt surface of the feeding conveyor belt 43, so as to timely monitor the weight of the medicine flowing out from the medicine feeder 42D, that is, the medicine storage part 42a; specifically, the belt surface of the feeding conveyor belt 43 may be arranged in the shape of a container, or a container for temporarily storing medicine may be directly arranged at the upper belt surface of the feeding conveyor belt 43. Of course, if the medicine powder is directly discharged from the medicine feeder 42b, the structure can be as shown in Fig. 1 and Fig. 3, and the medicine powder can be directly discharged to the upper belt surface of the feeding conveyor belt 43. When the weight reaches the standard, the feeding conveyor belt 43 will drive the medicine forward until it is poured into the dosing and stirring barrel 41. Considering the cleaning effect, a belt cleaner 43b may also be arranged at the feeding conveyor belt 43, which will be discussed later. The water dosing component includes a water inlet pipe 44 and a water inlet solenoid valve 44a, so as to realize the rapid addition of water in the dosing and stirring barrel 41 in time. In order to ensure the liquid level in the dosing and stirring barrel 41, a liquid level meter 47 can be arranged for monitoring and corresponding management can be carried out through the PLC module. A stirring component is also arranged at the dosing and stirring barrel 41. As can be seen from Figs. 4-6, the stirring component includes a stirring motor 45, and the power output shaft of the stirring motor 45 extends vertically downward, and a stirring blade 46 is arranged on the power output shaft. Each set of the stirring blades 46 includes an upper blade 46a and a lower blade 46b arranged in parallel with each other, and an inclined cotyledon plate 46c is convexly arranged at the lower surface of the upper blade 46a toward the lower blade 46b. The inclined cotyledon plate 46c has an included angle with the upper blade 46a, and there is a distance between the inclined cotyledon plate 46c and the lower blade 46b in the height direction. In order to ensure the stirring effect, the stirring blades 46 present a curved and twisted structure bent upward or downward as a whole, and in the height direction, more than one group of adjacent stirring blades 46 is taken as one group of stirring layers, and the bending directions of the stirring blades 46 of the adjacent two groups of stirring layers are opposite to each other. The matching inclination degree of the inclined cotyledon plate 46c and the upper leaf plate 46a can be seen in Figs. 7-8. In actual operation, on the basis of the above structure, the automatic operation function of the whole system can be realized by adding PLC modules. Specifically, PLC modules can be divided into PLC master control module A, weight measurement monitoring PLC sub-module B for monitoring weight measurement component, flocculant monitoring PLC sub-module C for monitoring flocculant dosing component 40a, and coagulant monitoring PLC sub-module D for monitoring coagulant dosing component 40b. In operation, the weight measurement monitoring PLC sub-module B summarizes the data of slime water concentration at different heights in the concentration tank 10 and sends it to the PLC master control module A. After processing the summarized data, the PLC master control module A sends the information to the flocculant monitoring PLC sub-module C and coagulant monitoring PLC sub-module D, so that the flocculant and coagulant can be added to the concentration tank 10 by the drug discharge pump E as shown in Figure 4, and the automation degree can be significantly improved. In actual operation, on the basis of the above structure, the automatic operation function of the whole system can be realized by adding PLC modules. Specifically, PLC modules can be divided into a PLC master control module a, a weight measurement monitoring PLC sub-module b for monitoring the weight measurement component, a flocculant monitoring PLC sub-module ¢ for monitoring the flocculant dosing component 40a, and a coagulant monitoring PLC sub-module d for monitoring the coagulant dosing component 400. In operation, the weight measurement monitoring PLC sub-module b summarizes the data of the slime water concentration at different heights in the concentration tank 10 and sends it to the PLC master control module a. After processing the summarized data, the PLC master control module a sends the information to the flocculant monitoring PLC sub-module c and coagulant monitoring PLC sub-module d, so that the flocculant and coagulant can be added to the concentration tank 10 by a medicine discharge pump e as shown in Fig.4, and the automation degree can be significantly improved. Further, the actual detection process of the slime water sample of the present invention includes the following steps: preparing the slime water using water and slime, with a density of water being pt and a density of slime being p 2; and taking slime water samples on site, and centrifuging the samples at a high speed in a laboratory centrifuge to obtain water samples and coal slime samples at the bottom, and measuring densities thereof respectively to obtain pt and p2 values; wherein, a volume v is known, and correction of the volume v is completed through a first correction; the specific process is as follows: an actual concentration in the sampling pipe (22) at any group of the weight detection components (20) is measured in advance, and then the measured weight is displayed in the weight detection component (22) at this time, thus obtaining the volume v of the slime water sample in any group of the weight detection components (20); assuming that weight values in the sampling pipe (22) which can be obtained from top to bottom are x1, x2, x3, x4..., concentration values to be obtained are m1, m2, m3, m4 the actual values of m1, m2, m3, m4...can be obtained through the following formulas: xiemipt+(1-m1)}vp2 x2=m2*v*pt+(1-m2)*v*p2 x3=m3*v'pi1+(1-m3)"v*p2 x4=m4*vpt+{1-m4)v*p2 According to the obtained actual values of m1, m2, m3, m4..., the dosage of the coagulant and flocculant to be added can be obtained by conventional calculation. After that, the flocculant dosing component 40a and coagulant dosing component 40b can be operated, and the medicine discharge pump e is started to cooperate with the normal addition of the slime water at the slime water inlet 30, so as to finally realize the online change of slime water concentration in the concentration tank 10 and the optimal adjustment of sedimentation effect. Of course, the above is one of the specific embodiments of the present invention. In actual operation, the conventional structural changes under the premise of the structure of the present invention should fall into the protection scope of the present invention as equivalent or similar designs, for example, replacing the simple structure under the functions of the sampling pipe 22 and the flexible connecting pipe 25 in the weight detection component 20, replacing the electromagnetic valve with other pump or valve structures, or making precise numerical changes to the bending radian of the stirring blade 48, or even making other changes to the shape of the concentration tank 10.
权利要求:
Claims (7) [1] A sludge water concentration system with a concentration detection function, comprising a concentration tank (10); the system further comprising a weight detecting component (20) comprising a sludge supply line (21), a sampling line (22) and a sludge water discharge line (23) arranged one behind the other along a sludge water conduit path; the sludge supply line (21) is in fluid communication with the concentration tank (10}, and both ends of the sampling line (22) are rigidly connected to and in fluid communication with the sludge water supply line (21) and the sludge discharge line (23) respectively via flexible connecting lines (25 the weight detecting component (20) further comprises a weighing sensor (27) for weighing a real weight of the sampling line (22), and a drainage valve (24) or a drainage pump for timely discharging the weighed sludge into the sampling line (22). wherein there are more than two groups of the weight detecting component (20) arranged one behind the other in a height direction of the concentration tank (10). [2] The sludge water concentration system with concentration detecting function according to claim 1, wherein the sludge water supply line (21) of the weight detecting component (20) present at the highest position is in fluid communication with an overflow barrier of the concentration tank (10). [3] The sludge water concentration system with concentration detecting function according to claim 1, wherein the flexible connecting line (25) is a corrugated hose, and a connecting rod (26) is fixedly connected to the sampling line (22), and the connecting rod (26) extends vertically upwards and is rigidly connected to a functional end of the weighing sensor (27). [4] The sludge water concentration system with concentration detecting function according to claim 1, wherein the drainage valve (24) is an electromagnetic valve, and the sludge water discharge conduit (23) is in fluid communication with the sludge water inlet (30) of the concentration tank (10). [5] The sludge water concentration system with concentration detection function according to any one of claims 1-4, wherein the system further comprises a flocculant dosing component (40a) and a coagulant dosing component (40b); wherein the flocculant dosing component (40a) and coagulant dosing component (40b) both comprise a dosing and stirring vessel (41), and drugs or medicinal powders enter a vessel interior space of the dosing and stirring vessel (41) through a drug supply (42b) sequentially ) and a conveyor (43) at a drug storage part (42a); and a water inlet pipe (44) for supplying water is arranged at the metering and stirring vessel (41); a water inlet pipe (44) for supplying water and a stirring component for mixing drugs in the inner space of the stirring vessel (41) are also arranged on the dosing and stirring vessel (41); drug delivery pipes of the metering and stirring vessels (41) of the flocculant metering component (40a) and the coagulant metering component (40b) are in fluid communication with the sludge water inlet (30) and then with the concentration tank (10); the stirring component consists of a stirring motor (45), a power output shaft of the stirring motor (45) extends vertically downwards, and stirring blades (46) are mounted on the power output shaft; wherein each set of the rudder blades (46) comprises an upper blade plate (46a) and a lower blade plate (46b) disposed parallel to each other, and an inclined cotyledon plate (46c) is arranged convexly at a lower plate surface of the upper blade plate (46a ) toward the lower blade plate (46b); there is an included angle between a plate surface of the inclined cotyledon plate (46c) and that of the upper leaf plate (46a), and there is a distance between the inclined cotyledon plate (46c} and the lower leaf plate (46b) in the height direction. [6] The sludge water concentration system with concentration detecting function according to claim 5, wherein the agitator blades (46) have a curved and twisted structure that is bent upwards or downwards as a whole, and in the height direction, more than one group of adjacent agitator blades (46) is formed as one group of stirring layers, and the bending directions of the stirring blades (46) of two adjacent groups of stirring layers oppose each other. [7] A concentration detection method using the sludge concentration system according to any one of claims 1-4, comprising the steps of: preparing sludge water using water and sludge, wherein the density of water is p1 and the density of sludge is p2 is; taking samples of sludge on site, and centrifuging the samples at high speed in a laboratory centrifuge to obtain water samples and carbon sludge samples at the bottom, and measuring the densities thereof to obtain p1 and p2 values, respectively; wherein a volume v is known, and correction of the volume v is completed by a first correction; wherein the specific process is as follows: an actual concentration in the sampling line (22) at each group of the weight detection components (20) is measured in advance, then the measured weight is displayed in the weight detection component (22) at that time, so that the volume v of the sludge sample is obtained for each group of the weight detection components (20); assuming that the weight values in the sampling line (22) obtainable from top to bottom are x1, x2, x3, x4…; the concentration values to be obtained are m1, m2, m3, m4 ...; and the actual values of m1, m2, m3, m4 ... can be determined with the following formulas: x1=m1*v*p1+(1-m1})*v*p2 x2=m2*v*p1+(1-m2) *v“p2 x3=m3*v*p1+(1-m3)*v*p2 x4=m4*v*p1+(1-m4)}*v*p2
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公开号 | 公开日 CN111377514A|2020-07-07|
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申请号 | 申请日 | 专利标题 CN202010195347.1A|CN111377514A|2020-03-19|2020-03-19|Coal slime water concentration system with concentration detection function and concentration detection method thereof| 相关专利
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