• 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:

    公开号:SU1813019A3
    申请号:SU894742968
    申请日:1989-12-27
    公开日:1993-04-30
    发明作者:R Klimpel Richard；D Khansen Robert；Dzh Fejzio Majkl
    申请人:Dow Chemical Co；
    IPC主号:
    专利说明:

    The invention relates to the separation of sulfur-containing compounds from coal, respectively. Foam flotation technology.
    Many coals contain relatively large amounts of sulfur, usually in the range from less than 1 and up to about 6%. Inorganic sulfur, which is mainly in the form of pyrite (iron disulfide), usually containing from about 40 to 80% sulfur, is part of most coals. This inorganic sulfur is present in both microscopic and microscopic forms. Microscopic forms are present mainly in veins, lenticular deposits, pyrite inclusions or strata, while microscopic forms are found in the form of fine particles, which can be very small, amounting to only 1 or 2 microns in diameter. The remaining sulfur, which is part of coal, (57) The method of foaming flotation of raw coal involves grinding to obtain 10-90% of coal particles smaller than 75 microns in size, introducing peerite depressant and releasing coal particles into the foam at a pH of 4.0 to 8 ,5. Pyrite Depressor is a compound of the formula
    Ι ·. '·· Η r 1 -sr 2 n
    Η. / '' / ·; '' Where R 1 : (CR R 5 R 6 ) n H at n = 1.5. or (CR ^ nOH for n = 1,2 or [(CR 5 R 6 ) xOy for x = 2-6, y = 1-3, R- (CH2) n for n = 2-3, R 3 and R ' 1 (CR 5 R 6 ) a - (O) b- (C =, OQ) at a = 0-2, vis = 0.1, QH, OH-, R 5 and R 6 - H, СНз C2H5. Depressor consumption is 0.01-1.0 kg / t. 2 zp f-crystals, 3 tabl. Sl - t is organic sulfur. 'Usually organic sulfur is contained in coal in the form of mercaptans and sulfides and is found in the very structure of coal.
    Air pollution from the burning of sulfur-containing coals is associated with ever-increasing concerns due to acid rain problems that occur in different parts of the world. It is assumed that the main factor that causes the acid rain problem is sulfur dioxide released during the combustion of sulfur-containing coals. Various technical solutions were investigated aimed at limiting the amount of sulfur dioxide released during the combustion of sulfur-containing coal. According to one such solution, it is planned to remove Sulfur dioxide from the exhaust gases generated during the combustion of sulfur-containing fuels, as described in the description of US> 1813019 AZ patent 4612175. The aim of other developments is to remove sulfur from coal before burning it. Since organic sulfur is usually extreme; it is difficult to remove from coal, the bulk of the effort in this area has been focused on removing inorganic sulfur from coal.
    One of the methods for removing inorganic sulfur from coal is flotation. Flotation is the process of processing a mixture of finely ground raw coal in a liquid. B. Provide flotation process. The separation of the target and hard coal from other undesirable finely dispersed coal. solid materials called ore rock, in particular from pyrite and ash, which are also present in liquids. Gas is introduced into the liquid or obtained at the place of use, as a result of which a foam mass is formed. This foam mass contains a certain amount of solid material and lifts it into the upper liquid layer together with the foam, while other solid materials remain in suspension in the liquid. Flotation is based on the principle that the introduction of gas into a liquid containing various solid particles causes the selective adhesion of a certain amount of gas and part of suspended solids. materials, leaving other materials unchanged. Particles to which gas bubbles adhere are lighter than other solid materials — materials, as a result of which they float on the surface, while other particles to which gas bubbles do not adhere remain suspended in the liquid. Selective adhesion of gas to some. solid particles, but not to others, due to. It is characterized by physical) chemical and surface differences of solid particles.
    Coal in an aqueous mixture is usually hydrophobic. That is, coal particles are poorly wetted by water, as a result of which, to a certain extent, a natural tendency is observed for adhesion to it: gas bubbles. In the processes of flotation processing of coal, various chemical additives are used that can improve the natural tendency of coal to flotation. In order to promote the natural hydrophobicity of coal, collectors are usually used, which are said chemical additives of one of the types. Such a collector increases the efficiency of adhesion of gas bubbles to coal. In cases where coal is oxidized or poorly flotated for some reason, a promoter may be added in addition to the collector to increase its efficiency. Another important chemical component that is commonly used in coal flotation processes is a foaming agent. 5 Foaming agents help to regulate the degree and efficiency of contact between bubbles and particles, the degree and efficiency of adhesion of bubbles to particles and the degree and effectiveness of removing 1θ of bubbles and particles from a liquid,,
    In addition to the use of chemical additives, a necessary part of any successful coal flotation process is a sufficient reduction in the size of the raw coal particles 15 before the actual flotation. Particle size reduction is necessary so that most of the coal and various solid ore materials that are present are in the form of physically different particles (particle release) or particles existing in the form of loose agglomeration. The chemical additives mentioned above can be successful in the process of separating coal from 25 ore rocks only if particles exist in this state.
    When coal and various ore particles have similar characteristics, it is difficult to separate them using simple flotation. When the differences are characteristics of solid hour. particles are small, or when particles of both the target and ore-rock solid materials show a tendency to flotation, as is often the case when processing particles of coal and pyrite, there is a need to use various methods to create or increase differences between particles in order to ensure separation flotation. To achieve this goal, there are various technologies and methods.
    One such technology is the separation of coal from inorganic sulfur-containing compounds. 45 studies on flotation processes is based on the use of depressants designed to weaken the flotation of either coal or inorganic sulfur-containing compounds. The depressant is a 50 agent that, when added to the flotation system, provides a special, voidable, and decontaminated material, due to which ; the possibility of its flotation is prevented. To explain this phenomenon, 55 different theories have been developed. In accordance with some of them, depressants enter into a chemical reaction with the surface of minerals, creating insoluble films of a wettable nature that are not able to interact with collectors, depressants
    due to various physicochemical mechanisms, in particular surface adsorption, effects on the mass, complexation or the like, they prevent the formation of a collector film, depressants act as solvents, activating the film, which is naturally associated with the mineral, and depressants act as a solution : Collector film repeaters. These theories seem to be closely related, therefore, an exact theory can ultimately be found with the inclusion of elements of the majority or all of the above and additional theories.
    In accordance with the description in the description of US patent f 3919080 flotation of inorganic sulfur in the form of pyrite sulfur. During the war, the flotation of coal particles is suppressed by the addition of sulfite in the flotation sludge. U.S. Pat. No. 3,807,557 discloses that pyrite is removed from coal in a two-stage flotation process. The usual first flotation is followed by a second stage, in which an organic colloid is used as a depressant for coal. US Pat. No. 4,211,642 discloses the use of polyoxyalkyl xanthate depressants to suppress pyrite flotation in coal flotation processes. British Patent Application Description 2174619A states that a compound that contains one group capable of adhesion to the surface of a hydrophilic mineral associated with a second group that is polar in nature and has hydrophilic properties ^ can be used in coal flotation processes for suppressing flotation of pyrite.
    Despite the many technical solutions that have been proposed for the separation of inorganic sulfur from coal, these proposed methods are not free from disadvantages. Some of these problems include the removal of insufficient amounts of inorganic sulfur from coal to a low overall degree of coal recovery. Thus, tr, which is necessary, is a method of separating coal from sulfur, which is inexpensive and simple to implement and use, and in the implementation of which the amount of inorganic sulfur remaining with coal is significantly reduced, which is combined with the absence of an undesirable Impact on the recovery of coal.
    In accordance with the present invention, there is provided a method for suppressing the flotation of inorganic sulfur-containing compounds during coal flotation. Such coal includes sulfur-containing compounds, is in the form of water sludge and is preliminarily crushed to a sufficiently small particle size, as a result of which most of the coal particles and particles of inorganic sulfur-containing compounds exist in the form of physically different particles or particles with loose agglomeration. The crude coal flotation process is carried out in the presence of an effective amount of depressant 15 for inorganic sulfur-containing compounds under conditions that suppress the flotation of these> inorganic sulfur-containing compounds, and the depressant includes a 20 compound corresponding to the formula:
    ОЗ rfleR 1 (CR 5 R% Н where η is an integer from 1 to 5, (CR 5 Rjn ОН where η is 1 or 2,
    KCR ^ 6 ^ Oy] H, where x ~ 2-6. y = 1-3.
    7CH2X1 where η = 2-3,
    R 5 and R-H, CH 3 or C 2 H 5 and each of R 3 and R 4 is a group of the formula
    ABOUT
    - (CR ^ -zKOJ-r-COe-Q where a is approximately 0 to 2, b is approximately 0 to 1, and c is approximately 0 to 1, each residue may occur in an unordered sequence, as indicated above, and the meanings of the symbols R 5 , R 6 and Q are defined above, Q-Η, OH.
    Quite unexpectedly, it was found that the implementation of the method of the present invention allows to selectively suppress the flotation of inorganic sulfur-containing compounds, without exerting an undesirable effect on the recovery of coal.
    Despite the fact that this was not specifically indicated in the description of the above formulas, in an aqueous medium with an acceptable pH, the depressant used in accordance with the method of the present invention. may be in salt form.
    Depressants suitable for practicing the present invention, by way of non-limiting examples, thus encompass CH3SCH2 / 2NH2.
    CHs / CHg / Z3 / CHg / gNNg, HOCH2CH2S / CH2 / 2NH hHOOCCH2S / CH2 / 2NH2. These compounds are either available in the art or can be prepared by a method known in the art. So, for example, a depressant that can be used in accordance with the present invention can be obtained by reactive acylation as described in U.S. Pat. No. 2,382,185, by reacting polyepichlorohydrin with an amine, as proposed in U.S. Pat. No. 3,320,317, or either amidation or transesterification of an acrylate polymer.
    Any amount of a depressant that is capable of suppressing the flotation of inorganic sulfur may be used 10 to practice the present invention. Typically, the amount of depressant needed change varies as a function of the conditions of the flotation process 15 and the degree of hydrolysis of the depressant. Other factors that affect the amount of depressant suitable for the practical implementation of the present invention encompass the type of coal that is subjected to flotation enrichment and the amount of inorganic compounds that are present in the coal. In a preferred embodiment, for each Metric ton of coal to be flotated, is used. use at least 0.01. kg depressant. In a more preferred embodiment, for every metric ton of coal that is flotated, it follows. use at least 0.025 kg of de30 _ mercaptan and 2-oxazoline in the presence of a catalytic amount of a transition metal salt, as proposed in the description of the measure a nd a p e rtance no. 4086273. They can also be obtained the reaction of mercaptan and alkanolamine sul. veil, as described in the description of US patent No. 2689867, or by the reaction of the primary amine with mercaptohalogenated elevated temperatures and pressure, as proposed in the description of US patent No. 2769839.
    Pyrite depressants can be used without further modification / can be introduced into the polymer main chain. Examples of polymers that can be used for this purpose, oh-. water-soluble polymers or their salts of anionic monomers, in particular alpha, beta-ethylenically unsaturated acids or esters, are included, including ': here, in particular acrylic, methacrylic,.
    fumaric, maleic, crotonic, itaconic or citraconic acids and partial esters of alpha, beta-ethylene unsaturated polycarboxylic acids, in particular acid methyl maleate, acid ethyl fumarate / Additional examples of polymers suitable for this purpose include polyepoxides obtained, in particular homopolymerization or copolymerization of glycidyl methacrylate. The class of other polymers that can be used for this purpose encompasses polyepichlorohydrins and polyethyleneimines.
    The polymers used in the practical embodiments of the present invention may have any molecular weight, or they would have the ability to suppress inorganic flotation 40 when they are introduced into the process in combination with a wide variety of collectors of foaming agents used in coal flotation processes. In the case where the angle 1>, which must be enriched by flotation, is oxidized 45 or it is difficult to flotate it for another reason, in order to increase the efficiency of collectors acceptable for the mass, it should be less than έδΟΟ'Ο, and ftp 'of foam coal flotation, fuel oils , kerosene, naphtha and other hydrocarbon materials. Examples of promoters are materials such as amines, condensation products of fatty acids with amines, and surfactants containing many ethylene oxide or propylene oxide residues. Examples of blowing agents that can be used in coal flotation include pine oils, eucalyptus oils, alcohols containing 5 to 12 carbon atoms, cresols, simple alkyl (C1-C4) pressants. In a preferred embodiment, for each metric ton of coal that is enriched by flotation, not more than 1 kg of depressant should be used, and in a more preferred embodiment, not more than 0.5 kg of depressant for each metric ton of coal to be flotated. .
    Depressants that may be used for. the practical implementation of the present invention, effective, sulfur, does not have any noticeable effect on the flotation of coal and does not possess practically ·, no flocculent properties. In the preferred embodiment, their average: molecular weight should be. be less than 40,000. In a more preferred embodiment, the average molecular mass should be less than 2500'0, and ftp ’most preferred should be less than 15,000.
    : In a preferred embodiment, the average molecular weight should be greater than 500, and with a more preferred embodiment greater than 2000. Most preferred. In an embodiment, the average molecular weight of the polymer acid or its salt should be greater than 4000.
    . A pyrite depressant may be given. den into the polymer backbone by methods known in the art. For example, they can be obtained at a polyethylene degree of grinding particles before the actual flotation; crude coal is usually necessary to grind with il-silt and grind. Coal can be crushed in a dry, semi-dry form and in the form of sludge. In the case where the coal is pulverized in the form of a slurry, this slurry typically contains at least about 50 weight. % dry matter. Different raw coal requires varying degrees of grinding to achieve a sufficient degree of crushing, depending on the geological history of coal deposition. Generally, in a preferred embodiment, the particle sizes of the raw coal should be such that at least 10 to 90% of the particles should be less than 75 microns. Before the flotation process begins, crushed coal is suspended in water. In a preferred embodiment, the content of 20 dry matter in the aqueous suspension of coal was equal to at least 2 wt.%, But did not exceed 30 wt.%.
    The depressants used in the practical embodiment of the present invention inhibit the flotation of inorganic sulfur-containing compounds. The term inorganic sulfur-containing compounds is used to mean inorganic compounds, naturally. associated with coal.
    It is characterized by a particularly high content of sulfur compounds, the cost of controlling the pH value can be compensated for by increasing the amount by which the flotation of inorganic sulfur-containing compounds is suppressed. In cases where it is desirable to optimize the amount necessary to suppress the flotation of inorganic sulfur-containing compounds, in a preferred embodiment, the coal flotation process of the present invention should be carried out at a pH of at least 5.5, but not higher than 8.5.
    The method of the present invention can be practically carried out using raw coal in the form of particles of the most various sizes, provided that before carrying out the flotation process, the coal must be subjected to sufficient grinding. A sufficient degree of grinding is achieved when the bulk of the particles of coal and ore rock, in particular pyrite, exists in the form of physically dissimilar particles or particles in a state of loose agglomeration. In the case when the particles are not in a physically separated form, they cannot be separated by flotation. To achieve sufficient esters of polypropylene glycols, dihydroxylates of polypropylene glycols and glycols. The selection of appropriate collectors and blowing agents should be made based on the circumstances of the particular flotation process.
    Depressants can be added at any stage of the separation process, provided that they are added before the flotation stage. In a preferred embodiment, the depressant should be added before or during the introduction of the collector, if any collector is used. In a more preferred embodiment, the depressant should be added before the introduction of the collector, if its addition is provided.
    The coal flotation method of the present invention can be carried out at any pH at which the depressants of the present invention are able to selectively inhibit the flotation of inorganic sulfur-containing compounds. In a preferred embodiment, flotation should be carried out at a natural pH of the source coal, which is usually at least 25, at least 4.0, but not exceeding 8.5. However, in some cases it is preferable to adjust the pH in order to optimize the effect of depressants. the latest invention. So, for example, in this 30 among which the compounds prevail, when the coal subjected to the fleet with sulfur, preferably the compounds of iron with sulfur. Examples of iron-containing compounds include pyrite (iron disulfide), marcasite and pyrrhotite. In a preferred embodiment, the inorganic sulfur-containing compound separated from the target coal should be pyrite.
    The degree of suppression of flotation of inorganic sulfur-containing compounds in the practical implementation of the present invention can be any, which will improve the process of separating inorganic sulfur-containing compounds from coal. Two factors are important to achieve this improvement. The first factor is that the amount of inorganic sulfur-containing compounds that flotate together with coal should be minimized. The second factor is that the amount of recovered enriched coal is optimal. In different situations, the relative importance of these two factors can vary. Any person skilled in the art is quite clear that in some situations it is desirable to reduce to a minimum Ko 1. the amount of sulfur-containing compounds that are released during the pro50
    IT 1813019 12, even if enriched coal is also provided at the same time. An example of such a situation is the case when the angle b includes sulfur-containing compounds in such a large amount that the effective use of coal becomes impossible. 'In such a situation, a significant reduction in the amount of inorganic sulfur-containing compounds is desirable even then; when 10 this process is accompanied by a decrease in the total amount of emitted enriched coal.
    In a preferred embodiment, the flotation process of inorganic sulfur-containing compounds 15 should be inhibited by at least about 5% using the depressants of the present invention; in a more preferred embodiment, the flotation of inorganic sulfur-containing compounds should be inhibited by at least about 10%. The following examples are provided for purposes of illustration, since they are by no means limited to the scope of the present invention. In all 25 cases, except as specifically indicated, the quantities of all materials are expressed in parts by weight or percent, Examples C-1 and 1-2. Suppression of pyrite flotation in coal with a low sulfur content of 30. ; ; ;
    The coal from the Lower Fruport formation is crushed and fractioned with particle sizes from 0.75 inches (1.91 cm) to 10 mesh. American standard si * ha (1.68 mm) 35 are separated by passing through a groove divider and a carousel packaging device in succession, and approximately 200 gram samples are packaged. These samples, which contain approximately 40 but 5% by weight of pyrite or approximately 2.7% by weight of sulfur, are stored before use in the freezer in order to slow down oxidation.
    Prior to flotation, a 200 gram coal sample taken in accordance with the foregoing is placed in a core mill with a diameter of 8 inches (20.3 cm) and a length of 9.5 inches (24.1 cm). Eight 1-inch (2.54 cm) diameter 50 stainless steel rods are also placed in this core mill. At the same time, they add if a flotation depressant and 500 ml of deionized water are used. Coal is milled in a cycle of 300 vol. at a rotation speed of 60 55 rpm. (OVM), after which the prepared slurry is transferred to a 3-liter cell of a flotation machine with an aerating mixer. Deionized water is added to this cell in the amount necessary to reach the mark and the pH value is measured. Any adjustments to pH at this stage are made by adding sodium hydroxide solution. The purified kerosene collector is added in an amount equivalent to 1.0 kg of collector per metric ton of raw coal and the slurry is conditioned with stirring for 1 minute. Then a foaming agent, a reaction product of glycerol with propylene oxide, is added with a molecular weight of approximately 450 in an amount equivalent to 0.1 kg per tonne of raw, unenriched coal. The sludge is again conditioned for 1 min, and then air is introduced into the flotation cell at a flow rate of 9 l / min. They include a scraper driven by an electric motor, which rotates at a speed of 10 rpm. and removes the foam-caked coal from the cell edge of the flotation machine to the collector trough. The foam is collected in two portions, the first of which is formed within 30 seconds, after the start of flotation, and the second during the next 3.5 minutes,
    Foam concentrates and non-flotated material, tails are dried in an oven overnight at 110 ° C. Then they are weighed and samples are taken for analysis. The ash content of each sample of the foam concentrate and tailings is determined by calcining a single-serving portion at that a temperature of 750 ° C in a muffle furnace. Then, the degree of recovery of enriched coal is calculated by the following formula:. . / t .. ..
    The degree of recovery of enriched coal in percent.
    [A / (A + B)] x 100 '., : Where A is the amount of recovered coal in the foam concentrate minus the amount of ash in this foam concentrate, and B is the amount in the tails minus the amount of ash in these tails. Thus, the degree of recovery of enriched coal in percent is equal to the percentage of coal that was originally present recovered as a result of the flotation process.
    The inorganic sulfur content in the coal sample is determined by analyzing the weighted portions of each sample. The sample is analyzed for iron and the percentage of iron is associated with the sulfur content since sulfur is present in. form of pyrite (iron disulfide). The weighed portion of the sample is oxidized in a solution of nitric acid, and then boiled in a solution of sulfuric acid. Then this solution is diluted to a standard volume and the iron content is determined in a DS plasma spectrometer. Then calculate the percentage of pyrite remaining with coal, which is equivalent to the percentage of remaining sulfur, as the pyrite content in the foam concentrate, the divided pyrite content in the concentrate plus the pyrite content in the non-flotation tailings. This amount is multiplied by 100 to obtain a percentage. Thus, the percentage of remaining pyrite is the percentage of pyrite that was originally present in coal and which remains with coal after the flotation process is completed. .
    The results are summarized in the following table. 1.
    1) The percentage of coal that is initially present and which is recovered as a result of the Processing. :
    2) The percentage by which the amount of recovered enriched coal is reduced when the depressant of the present invention is used.
    3) The percentage of pyrite that is initially present and which. stays with recovered enriched-! charcoal, ', 4) The percentage by which the remaining pyrite content decreases as a result of the use of depress ; RA of the present invention. 35
    The data table. 1 show that there is an improvement in the method when, in the course of the flotation process, which is usual in all other respects, for flotation of coal having a relatively low content of 40 samples are removed from them and analyzed according to the present invention.
    and a fraction with particle sizes less than Umesh. standard American sieves (1.68 mm) are separated by sequentially passing through a groove divider and a carousel packaging device and packaged in approximately 200 gram samples. Samples that contain approximately 7% by weight of pyrite or approximately 3.8% by weight of sulfur are stored in a freezer before use to slow down oxidation. 7
    Before flotation, a 200 gram coal cutter, selected in accordance with the foregoing, is placed in a core mill with a diameter of 8 inches (20.3 cm) and a length of 9.5 inches (25.1 s). In this core mill, eight 1-inch (2:54 cm) in diameter rods are then placed. of stainless steel. At the same time, add if a flotation depressant and 500 ml of deionized water are used. Coal is milled in a cycle of 60 vol. at a rotation speed of 60 rpm. (ОВМ), after which the prepared sludge is transferred to a 3-liter cell of a flotation machine with an aeration mixer. In this cell, deionized water is added in the amount necessary to reach the pH value. Any adjustments to pH at this stage are made by adding sodium hydroxide solution. The purified kerosene collector is added in an amount equivalent to 1.0 kg ’of the collector per metric ton of raw coal and the slurry is conditioned with stirring for 1 minute. Then a foaming agent, a methyl ether polypropylene oxide with a molecular weight of about 400, is added. equivalent to 0.1 kg per tonne of feed; raw coal. The sludge is again conditioned for 1 min, and then air is introduced into the flotation cell at a flow rate of 9 l / min. It includes an electric motor driven by a motor that rotates at a speed of 10 rpm. and remove the coal covered in foam. from the cell edge of the flotation machine to the collector trough. Foam is collected 8 in two portions, the first of which is formed within 30 seconds. after the start of flotation, a *.
    the second - over the next 3.5 minutes Samples of foam concentrates and flotation tails are collected, dried, taken'1.
    sulfur, use a depressant for pyrite as described above in previous examples :. . , rah. The results are shown in
    Examples 3-8 and C-2. Suppression of table 2.
    pyrite flotation in coal with a high content of- 1) The percentage of coal that is initially present by sulfur 45 and which is re-coal from the Lower Freeport formation is crushed and cooper as a result of processing ..
    2) The percentage value by which the amount of recovered enriched coal decreases if used. J niya depressant of the present invention.
    3). The percentage of pyrite that is initially present and which remains with recovered enriched coal.
    4) The percentage by which the remaining pyrite decreases as a result of using the depressant of the present invention.
    Comparison of comparative example 2 and examples 3-8 indicates that the application of depressants of the present invention does not exert any inhibitory effect on the flotation of pyrite due to the lack of a sufficient degree of grinding and release of particles. The effect of particle size reduction is illustrated in comparative examples C-3, C-6 and C-7, where it can be seen that an increase in the number of revolutions in the grinding cycle from 60 to 120 and up to 180 leads to a corresponding decrease. As a result of recovery of enriched coal recovery, and the amount of pyrite remaining with enriched coal, Examples 9-12 show that depressants of the present invention are effective when a sufficient degree of reduction in the size of the particles of raw coal is achieved. A higher degree of release of coal particles and pyrite particles is achieved when the coal grinding cycle in a core mill is 180 vol. in comparison with 120 vol. which provides a more efficient separation of coal from pyrite.
    权利要求:
    Claims (5)
    [1]
    1) The number of turns of raw coal in the mill during grinding in a rod mill before flotation. /
    1. The method of foam flotation of non-enriched coal, including grinding to obtain 10-90% of coal particles less than 75 microns in size, introducing a pyrite depressant and releasing coal particles into the foam at pH 4.0-8.5. Characterized in that, in order to increase efficiency a process, a compound of the general formula is administered as a depressant
    N
    R 1 -SR 2 -N, H N where R 1 - (CR 5 R 6 ) n> where η = 1-5 'is an integer: (CR 5 R 6 / n OH, where η = 1 or 2, or [(CR 6 RjxOyJ H, where x is 2-6 is an integer: y = 1-3 is an integer;
    H ^ CHnUn, where η = 2 or 3; >
    R 3 and R 4 are independently of each other - (CR ^ R 6 ^ - <0 ~ (0) b- (C ^) c ~ Q, where a = 0-2; c and c = 0.1. Q - ··. ··; hydrogen or hydroxyl;
    R 5 and R 6 are independently selected from H, CH3, or C2H5.
    [2]
    2) The percentage of coal that is initially present and which is recovered as a result of processing,
    2. The method according to claim 1, about t and l cha ysch and with me. that the depressant is a non-
    50 flocculation water-dispersible polymer containing residues of ethylene unsaturated acids not saturated with ethylene bonds of esters', partial esters not saturated with ethylene; bonds of α, β-polycarboxylic acids, polyepoxides, polyepichlorohydrins and polyethylene mines.
    [3]
    3) The percentage by which the amount of recovered enriched coal is reduced in the case of using the depressant of the present invention.
    3. The method of p.1,2, wherein u and d to I 1 in that a depressant is 0,011,0 consumption kg / t, '.,. /, ////. /// nenie listed depressants reduces the amount subjected pyrite flotation in combination with a very slight decrease in the amount of coal flotation being subjected. This demonstrates the effectiveness of the depressants of the present invention in the processing of coal with a relatively high sulfur content. The study of examples 2, 4, 5 and 8, which illustrate the preferred embodiments of the present invention, in comparison with examples 6 and 7 showed that the presence of small alkyl groups and / or the presence of a polar group in the depressants of the present invention provides a more efficient separation of pyrite from coal.
    Examples 9-12 and comparative examples C-3-7. /
    Particle Release Effect.
    <Using a different fraction of coal from the Lower Freeport formation, whose particle sizes were less than 10 mesh (1.68 mm), repeat the procedure described in the examples ·. ·. 2-8. Necessary. It is stated that the fraction minus 10 bbl (1.68 MM) that was used during the experiments of these examples was prepared at / Another time other than the time used to prepare the samples used during the experiments of Examples 3-8, and that from the data / data in the following table 3, it is obvious that it has the ability to release to a different degree. In the experiments of these examples, the number of revolutions of the core mill in the coal grinding cycle is different.
    The results obtained are summarized in the following table. 3.
    [4]
    4) Percentage of pyrite, which is first present and which remains with recovered enriched / ’coal.
    [5]
    5) The percentage by which the remaining pyrite is reduced as a result of / use of dep resso!
    ’RA of the present invention.
    Insolvency of insufficiently effective release of coal and pyrite particles is demonstrated in comparative examples C-3 to C-5. In each case ^
    1813019 18
    Table 1
    Example Depressor [0.025 kg / t] Enriched coal recovery. % 1 / The decrease in the recovery of enriched coal,% 2 / The remaining pyrite,% 3 / The decrease in the amount of remaining pyrite,% 4 / S-1 Is absent 82,4 - 32.8  - 1 C4H9S / CH2 / 2NH2 81.3 1.3 30.8 6.1 2 H2OOCH2S / CH2 / NH2 80.9 1.8 27.9 13.9
    table 2
    Example Depressor [0.025 kg / t] Enriched coal recovery,% 1 / The decrease in the amount of recovered coal,% 2 / The remaining pyrite,% 3 / The decrease in the number of remaining pyrite,% 4 / S-2 is absent 81.2  - 45.6 * 3 CE3S / CH2 / 2NH2 78.3 3.6 40.9 10.3 . 4. C4H9S / CH2 / 2NH2 79.9 1.6 38.9 14.7 5 HO / CH2 / 2S / CH2 / 2NH2 78.9 2,8 38.9 14.7 6 C7H15S / CH2 / 2NH2HCI 78.5 3.3 42,2 7.5 7 C10H21S / CH2 / 2NH2HCI 80.3 and 44.0 3,5 8 НО2ССН2 / СН2 / 2Н2 77.8 4.2 36.2 20.6
    Table 3
    Example Depressor [0.025 kg / t] Shredding / speed /! Enriched coal recovery,% 2 / The decrease in the amount of recovered coal,% 3 / The remaining pyrite,% 4 / Reducing the amount of remaining pyrite. %5/ S-3 is absent 60 76,4 - ‘ 38,0 S-4 HO2CCH2S / CH2 / 2NH2 60 77,2 -. 39.6 - S-5 CH2S / CH2 / 2NH2 60 78.5. - 40.3 S-6 is absent 120 74.1 - 33.8 - 9 HO2CCH2S / CH2 / 2NH2 120 73.0 1,5 32,0 5.3 10 CH3SCH2 / 2NH2 120 . 74.0 0.1 33.5 0.8 S-7 is absent 180 63.6 - 25.3 - ; eleven HO2CCH2S / CH2 / 2NH2 180 63.6 0 23.9 5.5 12 CH2S3 / CH2 / 2NH2 180 60.9 4.2 20.3 19.8
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    同族专利:
    公开号 | 公开日
    ZA893194B|1990-12-28|
    BR8906937A|1990-09-11|
    DE68920190D1|1995-02-09|
    CN1021414C|1993-06-30|
    EP0339856B1|1994-12-28|
    EP0339856A2|1989-11-02|
    US4826588A|1989-05-02|
    AU610727B2|1991-05-23|
    CN1037669A|1989-12-06|
    CA1335121C|1995-04-04|
    WO1989010199A1|1989-11-02|
    PL161814B1|1993-08-31|
    AU3558089A|1989-11-24|
    PL279154A1|1990-01-08|
    DE68920190T2|1995-05-11|
    EP0339856A3|1991-01-16|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US07/187,115|US4826588A|1988-04-28|1988-04-28|Pyrite depressants useful in the separation of pyrite from coal|
    PCT/US1989/001612|WO1989010199A1|1988-04-28|1989-04-17|Pyrite depressants useful in the separation of pyrite from coal|
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