The method of obtaining dust-free potassium fertilizers |
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IPC classes for russian patent The method of obtaining dust-free potassium fertilizers (RU 2215717):
 The method of obtaining potassium chloride / 2147011
The invention relates to the processing of potash ores, in particular the production of mineral fertilizers
 The way quasi determine the degree of saturation silvina hot solutions and device for its implementation / 2114804
The invention relates to a method continuous determining the degree of saturation Silvina hot solutions and device for its implementation
 The method of dust suppression potash fertilizers / 2095336
The invention relates to technologies for non-dusting of potash fertilizers by treating them glyconeogenesis reagents-dust-depressors with the addition of
 Method of improving soil fertility / 2093001
 The method of obtaining potassium chloride from sylvinite ores / 2019536
The invention relates to the field of flotation beneficiation of potash ores and can be used to produce potassium chloride improved particle size distribution
 The method of obtaining potassium fertilizers / 2196759
The invention relates to the field of production of potash fertilizers from sylvinite ores by flotation method
The method of obtaining salt / 2167286
 The method of obtaining potassium chloride / 2154025
The invention relates to techniques for processing fine potassium chloride, resulting in the production of potash fertilizers from sylvinite ores
The method of obtaining potassium chloride / 2147011
The invention relates to the processing of potash ores, in particular the production of mineral fertilizers
The method of obtaining potassium chloride / 2143999
The invention relates to techniques for the production of potassium chloride from sylvinite ores by the method of dissolution-crystallization
 The method of obtaining potassium chloride from sylvinite ores / 2136594
The invention relates to the enrichment of sylvinite ores upon receipt of potassium chloride
The way quasi determine the degree of saturation silvina hot solutions and device for its implementation / 2114804
The invention relates to a method continuous determining the degree of saturation Silvina hot solutions and device for its implementation
 The method of obtaining potassium chloride / 2114784
The invention relates to the production of potassium chloride from substandard fine by-product of potash factories and involves the dissolution of fine substandard potassium chloride - cyclone dust gallerycheck or flotation plants, crystalline product obtained by classification of the main product or concentrate, etc
Potassium chloride and sodium chloride production process / 2307790
Invention is intended for use in chemical and mining industries to manufacture mineral fertilizers and food salts. Ground sylvinite ore is dissolved in recycled potassium chloride-saturated lye. Resulting solution is directed at a rate of 0.03-0.15 m/s to leaching in the first dissolution column, with its electrodes connected to one of a current source poles, and treated by low-frequency (1-5 Hz) alternating electric field at voltage 30-100 v. Solution thus enriched with potassium chloride is fed together with solid phase into the downstream second dissolution column with its electrodes connected to opposite pole of the current source. Treatment by alternating electric field in the second column is effected under the same conditions as in the first column. Two-step leaching results in potassium chloride solution and sodium chloride-enriched solid phase. Separated sodium chloride is sent to production of food salt. Potassium chloride is separated from solution via crystallization.
Method of separation of potassium chloride / 2315713
Proposed method includes dissolving of sylvinite, clarification of hot saturated lye, crystallization of product in presence of fluoro-reagents, thickening and filtration of suspension and treatment of non-clarified saturated lye. Clarified saturated lye is treated with hot solution saturated with potassium chloride before crystallization of product. Potassium chloride solution is obtained by dissolving off-grade floatation potassium chloride in water. Off-grade floatation potassium chloride is just cyclone dust, fine fractions of floatation product or filtered-off intermediate product used for forming sludge suspension which is clarified and is thickened after clarification and is directed for treatment of non-clarified saturated lye.
Method for processing salt rejects of magnesium production / 2316604
Method comprises steps of grinding salt rejects material; leaching them by means of concentrated solution of potassium chloride; separating mother liquor and solid potassium chloride; washing potassium chloride and drying potassium chloride; before washing procedure, dissolving solid potassium chloride in water at temperature 70 - 90°C; filtering solution and cooling filtrate till temperature 10 - 25°C; filtering received suspension of potassium chloride; washing deposit by means of potassium chloride solution with concentration 300 - 350 g/dm3 and filtering it; returning prepared filtrate for leaching salt rejects material.
 Method of producing brine for electrolysis / 2347746
Present invention can be used for obtaining aqueous saturated solutions of alkali metal halides, which are used in the production of chlorine and alkali from electrolysis. The method of producing aqueous saturated brine of alkali metal halides involves underground dissolving of salt deposits with simultaneous purification of brine in the brine production well. Purification from toxic impurities - calcium and magnesium compounds is done using spent brine of a halide of the corresponding metal as the solvent, obtained from an electrolysis unit with pH 9-12. The brine from the well is then purified from calcium and magnesium compounds.
 Method of controlling process of sylvinite ore dissolution / 2352385
Invention relates to technique of controlling processes of sylvinite ores dissolution and can be used in production of potassium chloride by dissolution-crystallisation method. Method of controlling processes of sylvinite ores dissolution includes regulation of ore supply depending on content of useful component in input flows, measuring ready solution temperature and determining sodium chloride content in solution by calculation method. Additionally determined are density, temperature and consumption of dissolving solution, content of sodium chloride in it is determined by content of useful component, density and temperature. Ore supply is calculated according to suggested equation and calculated value is given as task to system of weigher control.
Potassium chloride obtaining method from sylvinite ore / 2366607
Method involves ore crushing, mill pulverising, sludge removal, grouping of desludged ore suspension. Coarse fraction of desludged ore suspension with density of 60-70% of solid matter is conditioned with emulsion of reagents, which is taken in quantity of 60-70% of total reagent flow; then, coarse fraction is combined with small fraction of desludged ore suspension with density of 30-40% of solid solid matter and supplied to the combined floatation. At that, the rest part of the emulsion of reagents is supplied in parts immediately to the combined floatation process thus obtaining crude concentrate and remainders. Crude concentrate is processed thus obtaining the finished product, and floatation remainders are grouped, small fraction of remainders is supplied to the dump pit, and coarse one - to the mill to be pulverised. When coarse fraction of ore suspension is being conditioned, water solution containing hydrochloride of high-molecular amine, oksal and catalytic gas oil at mass ratio of 1:0.4:0.4 correspondingly is used as emulsion of reagents.
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The invention relates to techniques for the production of potassium chloride from sylvinite ores with low content of dust fractions. The method involves dissolving the ore, the crystallization of potassium chloride from the resulting hot saturated solution in a multi-stage vacuum crystallization installation with getting the suspension with a degree of saturation of the liquid phase on sodium chloride to 0.98, the classification of the solid phase of the suspension into coarse and fine fractions of potassium chloride, drying and dedusting of the coarse fraction, while the filtered wet crystalline fraction of potassium chloride is subjected to storage at ambient temperature, drying and dedusting with the addition of a dedicated dust-like fraction to wet the solid phase entering the store. Wet crystalline fraction of potassium chloride after storage is dried together with the coarse fraction of the main flow or separately. The method allows to obtain a dust-free potassium - potassium chloride while simplifying the process by eliminating technological operations of dissolution of the crystalline fraction and crystallization Gloria to techniques for the production of potassium chloride with low content of fine fractions.
Widely known methods for producing potassium chloride from sylvinite ores by methods of hot dissolution, separation of sodium chloride, bleaching solutions, cooling installation, vacuum crystallization, separation of kristalliset with subsequent drying and allocation of dust fractions. Dust fraction can either be returned to the process or to pelletize (see M. E. Posin. Technology of mineral salts, so 1, Ed. In chemistry, 1970, S. 154-159).
As shown, the known methods do not allow to obtain the target product with a low content of fine fractions (less than 100 microns) or are complex and require more power consumption.
A method of obtaining dust-free potassium fertilizers (see and.with. The USSR 781194, CL 05 D 1/04, bull. 43, 1980) by processing of sylvinite ores, followed by separation of potassium chloride from the clarified solution multistage vacuum crystallization when the degree of saturation of the solution in sodium chloride 0,97-0,98 with subsequent classification of the solid phase on the coarse and fine crystalline product, drying, dust removal and processing of dust fraction water return solution together with the washing water from the coarse fraction in the crystallization process, obrir>Since filing the last in the solution before the vacuum crystallization. There is a method allows to obtain the target product with a low content of dust fractions, however, differs complexity associated with the need to adjust the water balance of the process of dissolution-crystallization when entering suspension dust fractions, fraction of which reaches 30% of the flow kristalliset, and requires large energy consumption for heating of the suspension to 90-100oC, and then cooling the solution to installing vacuum crystallization.
A method of obtaining dust-free potassium fertilizers from sylvinite ores - prototype (see a.with. The USSR 990757, CL 05 D 1/04, bull. 3, 1983) by dissolution, including the crystallization of potassium chloride from the resulting hot saturated solution in a multi-stage vacuum crystallization installation with getting the suspension with a degree of saturation of the liquid phase on sodium chloride to 0.98, the classification of the solid phase of the suspension into coarse and fine fractions, separation from the suspension, washing, drying and dedusting coarse fraction, followed by a mixture of crystalline and dust fractions with 15-20% hot saturated solution, cooled under stability, associated with the need to adjust two threads crystallization of potassium chloride, and water balance of the process of dissolution-crystallization and requires energy for the dissolution of the crystalline fractions and crystallization of the desired product from the resulting suspension.
Object of the present invention to provide a dust-free potash - potassium chloride - while simplifying the process and reducing energy consumption.
The positive effect is achieved by the fact that in contrast to the known method, including the dissolution of sylvinite ores, the crystallization of potassium chloride from the resulting hot saturated solution in a multi-stage vacuum crystallization installation with getting the suspension with a degree of saturation of the liquid phase on sodium chloride to 0.98, the classification of the solid phase of the suspension into coarse and fine fractions of potassium chloride, drying and dedusting coarse fraction, the proposed method filtered wet crystalline fraction of potassium chloride is subjected to storage at ambient temperature, drying and dedusting with the addition of selected powdered Malorita potassium after storage of dried separately or combined with the coarse fraction of potassium chloride the main thread.
A positive effect in getting dedusted potassium chloride on the proposed method is expressed in simplifying the process by eliminating complicated hardware design of technological operations of dissolution of the crystalline fraction and crystallization of potassium chloride, and reduction in energy consumption for heating and cooling of the suspension.
The method consists in the following. In contrast to the known method in the proposed method, the filtered wet crystalline fraction of potassium chloride is subjected to storage at ambient temperature. The solubility of potassium chloride significantly depends on temperature. Crystalline potassium chloride has a developed surface which is in contact with the liquid phase contained in the filtered potassium chloride.
When the temperature of the environment at different times of day on the surface of the crystals intensive processes are dissolution-crystallization with the formation of numerous phase contacts, which leads to crystal growth and the alignment of their surface. The process of recrystallization of potassium chloride is particularly intense at high polydispersity melkomasshtabnogo potassium chloride under static loads.
At the same time, the presence of filtered potassium chloride to 10% of the liquid phase does not lead to the drying up of salts in the mass and caking potassium chloride during storage is negligible. Storage of wet potassium chloride can be carried out in covered warehouses and open shoulders. In the latter case, necessary drainage and the use of liquid phase formed from precipitation.
The table below shows the change in particle size distribution of wet potassium chloride, depending on the duration of storage on the indoor warehouse.
The table below shows that during storage of the crystalline potassium chloride in the wet state is the aggregation of the product by recrystallization with the gradual disappearance of particulate fractions is less than 0.2 mm
When filtering the crystalline potassium chloride, obtained by hydroclassification suspension kristalliset, humidity filtered potassium chloride reaches 12% (typically 8-10%), adding to it a dry cyclone dust moisture content is reduced to 6-9%. During storage of this product there is a gradual decrease humidity salt in the top layer of the pile (up to~ 4%) and uterine migration process is at the bottom of the pile.
Potassium chloride after storage of dried separately or combined with the coarse fraction of potassium chloride the main thread. Cyclone dust direct mixing with the filtered wet crystalline fraction of potassium chloride, the resulting mixture is sent to storage at ambient temperature.
From the above description, the essence of the method shows that the proposed method allows to obtain a dust-free potassium - potassium chloride with simultaneous simplification by eliminating compared to prototype complex hardware design of technological operations of dissolution of the crystalline fraction and crystallization of potassium chloride, as well as reducing energy consumption for heating and cooling of the suspension.
The method is as follows.
Sylvinite ore is subjected to the dissolution of the hot circulating solution with separation from the sodium chloride solution and slurry. From the clarified solution is crystallized potassium chloride in a multistage vacuum crystallization installation with getting the suspension with a degree of saturation of the liquid phase on sodium chloride to 0.98. The suspension is classified, for example, hydrocyclones on krupnokristallichesky are preferably class 0,2 mm Suspension coarse and fine fractions of potassium chloride is filtered separately and washed on the filter. The coarse fraction of potassium chloride is dried to obtain the target product, and crystalline potassium chloride is subjected to storage at ambient temperature, then dried.
Wet crystalline potassium chloride is stored either in covered warehouses or outdoors. In the latter case, the quality of the product is enhanced by additional washing precipitation, however, it requires drainage of wash water and their subsequent use in the main loop.
Duration of storage of wet potassium chloride for specific conditions is determined experimentally depending on the storage volume, climatic conditions of the region, time of year and the requirements of the final content of small classes in the wet product.
Dedusting of the target product as a rule combined with the drying, for example, in the apparatus of the "fluidized bed", in which classes of less than 0.2 mm otdovat and out through the cyclone system. Cyclone dust added to the mixer to the filtered wet crystalline fraction of potassium chloride.
Wet mackris is stogo potassium main thread or separately.
Examples of the method.
EXAMPLE 1 100.00 wt.parts of sylvinite ore having the composition (wt.share,%): KCl - 26,52; NaCl - 69,12; MgCl2- 0,08; CaS4- 2,18; N. O. - 1,72; H2O - 0,38, processed 199,63 wt.the working parts of a solution having the composition (wt. share, %): KCl - 11,50; NaCl - 19,33; MgCl2- 0,50; CaSO4- 0,47; H2O - 68,20 and 17,71 wt.parts of water at a temperature of ~100oC.
After separation of nerastvorimaya part of the ore and clarification of the saturated solution from the particles of the clay slurry was obtained 232,77 wt.parts of the clarified solution having a temperature of 95oAnd the following composition (wt.share,%): KCl - 19,86; NaCl - Of 16.84; MgCl2- 0,43; CaS4at 0.42; N2On - 62,45. The degree of saturation of the clarified solution of KCl is 0.95, the degree of saturation of NaCl is equal to 1.
Clarified saturated solution was cooled under vacuum to a temperature of 30oWith, in the process of cooling to the solution was added 11,07 wt. parts of water. The result was the suspension obtained, consisting of 23,28 wt.parts of the solid phase composition (wt.share,%): KCl - To 99.00; NaCl - 1,00; MgCl2- 0; CaSO4- 0; N. O. - 0; H2O - 0 and 201,66 wt.parts of mother liquor having the composition (wt. share, %): KCl - 11,50; NaCl - 19,33; MgCl2- 0,50; CaSO4of 0.47; N2On - 68,20. The degree of saturation of the uterine classification class0,2 mm
Suspension of kristalliset with a particle size of more than 0.2 mm filtered; it was obtained 12,80 wt.parts filtered kristalliset having the following composition (wt.share,%): KCl - 93,87; NaCl - 2,07; MgCl2- 0,03; CaSO4- 0,03; N. O. - 0; H2O - 4,00, which was dried to obtain 12,31 wt.part dedusted product of the following composition (wt.share,%): KCl - 97,58; NaCl - 2,16; MgCl2- 0,03; CaS4- 0,03; N. O. - 0; H2O - 0,20. If this product had the following particle size distribution, wt.the fraction, %: +1 mm - 1,8; -1 - +0,2 mm - 95,3; of-0.2 to +0.1 mm - 2,6; -0,1 mm to 0.3.
Suspension of kristalliset with a particle size less than 0.2 mm filtered separately; it was obtained 12,51 wt.parts filtered kristalliset having the following composition (wt -%): KCl-90,02; NaCl - 2,88; MgCl2- 0,05; CaSO4- 0,05; N. O. - 0; H2On - 7,00.
The mother liquor is separated by filtration of a suspension of coarse and fine fractions kristalliset, United (just 199,63 wt.parts of mother liquor) and returned to the stage of dissolution of sylvinite ore.
Crystallized with a particle size less than 0.2 mm was mixed with 1,14 wt.parts of the cyclone dust generated during the subsequent drying kristalliset.
The resulting mixture was stirred at ambient temperature is th dried dust class 0,2 mm. The result is a 11,66 wt.parts dedusted product of the following composition (wt.share, %): KCl - 96,60; NaCl - 3,10; MgCl2- 0,05; CaSO4- 0,05; N. O. - 0; H2O - 0,20, and 1.14 wt.parts of the cyclone dust, which is returned to the process. The resulting product had the following particle size distribution, wt. the fraction, %: +1 mm - 0; -1 - +0.2 mm is 98.2; of-0.2 to +0.1 mm - 1,8; -0,1 mm - 0.
EXAMPLE 2 the process was carried out in accordance with example 1, but 12,51 wt. part of the filtered kristalliset with a particle size less than 0.2 mm kept at ambient temperature for 20 days, after which he teamed with 12,80 wt.parts filtered kristalliset with a particle size of more than 0.2 mm, the United crystallized mixed with 2,34 wt.parts of the cyclone dust generated during the subsequent drying kristalliset. The mixture was dried to obtain 23,97 wt.parts dedusted product of the following composition (wt.share, %): KCl - 97,11; NaCl - 2,61; MgCl2- 0,04; CaSO4- 0,04; N. O. - 0; H2O - 0,20.
Granulometric composition of the dust-free product, wt.the fraction,%: +1 mm to 1.0; -1 - +0,2 mm - 97,2; of-0.2 to +0.1 mm - 1,8; -0,1 mm - 0.
EXAMPLE 3 the Method was carried out in accordance with example 1, but the product is kept in an open collar.
After storage and drying stages of the dissolution of sylvinite ore.
Claims 1. The method of obtaining dust-free potassium fertilizers from sylvinite ores, including dissolution, crystallization of potassium chloride from the resulting hot saturated solution in a multi-stage vacuum crystallization installation with getting the suspension with a degree of saturation of the liquid phase on sodium chloride to 0.98, the classification of the solid phase of the suspension into coarse and fine fractions of potassium chloride, drying and dedusting coarse fraction, wherein the filtered wet crystalline fraction of potassium chloride is subjected to storage at ambient temperature, drying and dedusting with the addition of a dedicated dust-like fraction to wet the solid phase coming into the store. 2. The method according to p. 1, characterized in that the filtered wet crystalline fraction of potassium chloride after storage is dried together with the coarse fraction of the main flow.
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