Method of separation of potassium chloride |
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IPC classes for russian patent Method of separation of potassium chloride (RU 2315713):
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.
 A method of obtaining a crystal of potassium chloride from the cyclone dust potash ore flotation concentrate / 2232130
The invention relates to the processing of sylvinite ores in potash and is intended for the production of white potassium chloride from the cyclone dust flotation concentrate
 The method of obtaining dust-free potassium fertilizers / 2215717
The invention relates to techniques for the production of potassium chloride from sylvinite ores with low content of dust fractions
 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
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.
 Device for processing of sylvinite-carnallite raw materials / 2369558
Device for processing of sylvinite-carnallite raw materials includes the following components installed along with flow - lye clarifier, two dissolving apparatuses connected to each other, augers and drier. Dissolving apparatuses are installed vertically along flow one after another and are connected to each other by means of transport auger. The last of apparatuses is connected to drier via dehydration auger installed at the angle of at least 15°. Inside each dissolving apparatus, coaxially to flow, there is a column installed for processing of mix with alternating feeding and grounding electrodes installed in them. Walls of column for processing of mix and dissolving apparatus create a tube space for lye drain.
 Method to control silvinite ore dissolution / 2398620
Invention can be used in production of potassium chloride. Proposed method comprises control over ore feed subject to content of useful component in inlet flows, measurement of ready solution temperature, density, temperature and consumption of dissolving solution. Additionally, content of potassium chloride in ready solution is measured after its defecation, as well as its consumption. Obtained data and temperature are used to determine roe feed to correct its main flow in compliance with the following relation, and calculated magnitudes are entered in proportioner control system:
 Method to control carnallite ore dissolution / 2404845
Invention can be used in production of synthetic carnallite. Proposed method comprises adjusting ore feed depending upon the content of useful component in inlet flows and measurement of temperature. Besides solvent flow rate, solvent density and content of magnesium chloride therein and content of potassium chloride in carnallite ore flow are measured. Parametres thus obtained allow determining carnallite ore flow rate from the relationship indicated below to make setting to be incorporated with ore consumption control system:
 Method of controlling process of dissolving potassium chloride / 2409415
Invention can be used in halurgic production. The method of controlling the process of dissolving potassium chloride involves controlling supply of ore depending on content of the useful component in input streams, measuring temperature of the ready solution and consumption of dissolving solution. The ore used is an electrolyte obtained during electrolysis of molten dehydrated synthetic carnallite having the following composition: KCl - 60-80 %, MgCl2 + CaCl2 - 7-9%, insoluble particles - up to 1 %, NaCl - the rest. Content of magnesium chloride in the ready solution, its consumption, content of potassium chloride in the halite wastes and its consumption are also measured. The obtained parametres are used to determine maximum content of potassium chloride in the ready solution. The optimum consumption of electrolyte is calculated and the calculated value is used as a setting in the electrolyte consumption control system:
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FIELD: separation of potassium chloride from sylvinite ores. SUBSTANCE: 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. EFFECT: possibility of using off-grade floatation potassium chloride at halurgy plants without impairment of water balance in potassium chloride dissolving-crystallizing processes. 2 tbl, 3 ex
The invention relates to techniques for the allocation of potassium chloride from sylvinite ores by the method of dissolution-crystallization using in the technological cycle substandard flotation of potash. Widely known methods of extraction of potassium chloride from sylvinite ores, including its dissolution at elevated temperature, the allocation of halite blade, clarification received hot saturated liquor, crystallization of potassium chloride while cooling liquor under vacuum, the thickening of the suspension and isolation of the target product from the solution by heating the latter and filing for the dissolution (see Meiosis. Technology of mineral salts, vol.1, Chemistry, 1970, C-159, 167-168). In the combined schemes to the raw material supplied to the dissolution, added pulverized potassium chloride, separated from the main mass of the product by sieving or air classification. Known methods theoretically allow the use of substandard flotation of fine potassium chloride on gallerycheck factories, however, as shown by our studies when applying flotation pulverized potassium chloride, for example, cyclone dust, dissolving together with sylvinite ore in solvents was observed intense pricing, Pena scored a bucket elevators, and dissolve the oil of halite stopped, that led to the stop AIDS. The method for extracting potash from potassium-sodium raw materials, including leaching of raw materials at about 100-105 With whitening slurry, evaporating the clarified solution with separation from solution of excreted sodium chloride, separation of the product from the solution by crystallization, separating it from the mother liquor and returning on the last stage of leaching. Order processing clay-salt suspension - waste flotation of sylvinite and obtain potassium chloride high quality mother solution process raw materials and heat (see A.S. USSR №806605, CL CO1D 3/04, publ. 23.02.81, bull. No. 7). There is a method allows the use of waste flotation of clay-salt slurry containing potassium chloride, however, does not preclude intense pricing suspensions in solvents due to the presence in the slurry of flotation reagents. In addition, the known method is complicated and energy-intensive, since it involves the use of residue to maintain the water balance of the process. A known way of separating potassium chloride from sylvinite, including its dissolution, the clarification received a busy liquor, crystallization of the product, the thickening of the suspension and centrifugation in the presence of the amine with the separation of the product from the filter is and the supernatant. Before dodging rich liquor is treated with the filtrate and crystallization is carried out in the presence of supernatant (see A.S. USSR №833507, CL 01D 3/08, publ. 30.05.81, bull. No. 20) - the prototype. There is a method allows the selection of potassium chloride from sylvinite method of dissolution-crystallization in the presence of a flotation reagent - amine, however, it is not possible to use substandard products photofabric containing potassium chloride. In addition, the treatment of hot saturated liquor filtrate and feed on the crystallization of supernatant having a temperature of 25-40°and lowering the temperature of the clarified liquor before vacuum crystallization unit (ADC) with the release of halite. To prevent crystallization of halite, you must enter an excessive amount of condensate, otherwise it is impossible to get conditioned potash. Enter excess condensate will result in the disturbance of the water balance of the process and the loss of the target product. Object of the present invention is to provide the possibility of using substandard crystalline flotation of potassium chloride on gallerycheck enterprises without disorders of water balance processes of dissolution-crystallization. The problem is solved in that in contrast to the known with the person, including the dissolution of potassium chloride from sylvinite, clarification received hot saturated liquor, crystallization of the product in the presence of flotation reagents, thickening and filtering the suspension, the processing of thick saturated liquor, the proposed method of processing clarified saturated liquor before the crystallization of the product are hot saturated in potassium chloride solution obtained by dissolving in water substandard flotation of potassium chloride, which represents the cyclone dust, fines flotation product or filtered, preproduce with obtaining a slurry suspension, which is then lighten, and the thickened slurry suspension resulting from the clarification sent for processing thick saturated liquor. The essence of the method consists in the following. In contrast to the known method, the treatment of hot clarified liquor before the crystallization of the product are rich in potassium chloride solution obtained by dissolving substandard flotation of potassium chloride, which represents the cyclone dust, fines flotation product or filtered, preproduce. The dissolution is carried out at the temperatures of 80-100°to obtain the solution with the highest concentration of KCl and tempera is Urai, similar to the temperature of the clarified liquor. Then, the solution lighten with the addition of flocculant, for example, polyacrylamide, obtaining plum, almost not containing sludge. Perhaps the use of additional control filtering, for example, on a filter press. Processing the clarified liquor take saturated in potassium chloride and unsaturated in sodium chloride solution in an amount equivalent to the amount of water added to prevent crystallization of sodium chloride due to the formation of the salt slurry (NaCl) when the cooling of the hot liquor gallerycheck factories, as well as to replenish the water evaporating on installing vacuum crystallization (ICD) during cooling under vacuum, the clarified liquor, preventing saturation sodium chloride liquid phase. Table 1 shows the dependence of the formation of the salt slurry in the cooling of the hot liquor gallerycheck factories at OJSC "Uralkali".
The degree of saturation of the cooled solution after internals for sodium chloride should be 0,97-0,99 that guarantees conditional on KCl product. Processing the clarified liquor are in the receiving tank internals, either directly in the body internals. Under these conditions, is fully observed water balance of the process. You can enter excess of a solution of potassium chloride, but it leads to and the discharge of excessive uterine solutions. With a lack of off-grade potassium chloride used to prepare the solution, internals along with a heated saturated solution of KCl is injected DL water which prevent contamination of the target product sodium chloride in the process vacuum crystallization. Table 2 shows examples of characterizing the consumption norms of the input at the UWC water and KCl solution for conditions gallerycheck factories of the Urals, calculated from the equations of material balance. These figures illustrate the proposed method, and they can change with temperature fluctuations of dissolution, the degree of saturation KCl, hot saturated liquor and the content of sodium chloride, flow of sylvinite ore, and its chemical and granulometric composition and other parameters.
Note: the Composition of the ore, mass fraction, %: 27,9 - KCl, 68,0 NaCl, 0.14 To MgCl2, 1,97 - CaSO4,1,7 - h.o., 0,29 - N2O. The composition of the cyclone dust mass fraction, %: 92,17 - KCl, 5,69 NaCl, 0,23 - MgCl21,10 - CaSO4at 0.7-h.o., 0,11 - H2O. Mass fraction of KCl in the solution of the cyclone dust - 28%. In contrast to the known method of processing a busy thick liquor are condensed, for example, to W:T=1-3, slurry suspension obtained from substandard flotation of potassium chloride when lightening hot saturated solution. The processing liquor lead either to feed him for clarification, or in the thickener. While potassium chloride contained in the slurry suspension is transferred into the liquid phase of liquor without cooling, and insoluble compounds - clay and CaSO4together with the thick sludge liquor separated in the thickener. Flotation reagents introduced to the flotation potassium chloride, do not accumulate in the technological cycle, as are sorbed clay slurry of ore and crystallization at the UWC. As substandard flotation of potassium chloride used cyclone dust, fines flotation product, filtered middlings obtained, for example, hindered suspension. To reduce the content of sodium chloride in the feed to the processing of hot saturated in potassium chloride solution KCl content in the non-conforming product it is desirable to have more than 90%.Thus, the implementation of the present invention can solve the problem: use substandard crystalline flotation potassium chloride on gallerycheck enterprises without disturbing the water balance processes of dissolution-crystallization. Examples of the method. Example 1 500 parts by weight of sylvinite ore containing 27.9% of KCl was dissolved in 1197,7 parts by weight of the solvent solution with obtaining 1328,8 parts by weight of thick saturated liquor composition, mass fraction, %: 19,76 - KCl, 17,32 - NaCl, 0,69 - MgCl2, 0,78 - CaSO4, 0,53 - h.o., 60,92 - H2O. of 25.8 parts by weight of a cyclone dust containing 92,2% KCl was dissolved in 57,8 parts by weight of water at a temperature of 90°and osvetleni on the thickener with the addition of 0.1%aqueous solution of polyacrylamide. Got 53,6 clarified by mass of the solution and slurry suspension with W:T=2, which processed the thick rich liquor. The resulting suspension was applied to the thickener is by adding polyacrylamide and the clarified liquor was treated with a solution of potassium chloride, then cooled at the UWC to a temperature of 25°C. Suspension of kristalliset has agglomerated and the target product is separated on a filter and the mother liquor was heated to 112°and filed for dissolution of sylvinite ore. Got 138,8 parts by weight of the product with a mass fraction of KCl to 98.6%. Example 2 The method was carried out in accordance with example 1, but on preparation of a solution of potassium chloride was taken flotation concentrate obtained by hindered by class - 1 mm photoproduct and filtering, and a saturated solution of flotation of potassium chloride after separating from him slurry suspension was subjected to final filtration on a filter press before applying the solution on a processing clarified saturated solution held in zapatoca glass thickener. Example 3 The method was carried out in accordance with example 1, but on preparation of a solution of potassium chloride used fractions of the flotation product less than 1 mm. A way of separating potassium chloride from sylvinite, including its dissolution, the clarification received hot saturated liquor, crystallization of the product in the presence of flotation reagents, thickening and filtering the suspension, the processing of thick saturated liquor, characterized in that the clarified saturated solution before crystallization of the product treated with a hot saturated with respect to x is Oristano potassium solution, obtained by dissolving in water substandard flotation of potassium chloride, which represents the cyclone dust, fines flotation product or filtered middlings, obtaining slurry suspension, which is then lighten, and the thickened slurry suspension resulting from the clarification sent for processing thick saturated liquor.
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