SU966008A1 - Process for isolating schoenite from polymineral potassium ores - Google Patents

Description

The invention relates to the technology of inorganic substances and can be used in the processing of polymineral potash ores containing potassium, sodium and magnesium chloride sulfate salts.

The closest to the invention in technical essence and the achieved result is a method for isolating chenite. from polynomineral potash ores by dissolving them in a reusable chenitic paiCT pipe, separating the sludge, cooling the resulting solution, returning 65-75% of the mother liquor to the ore dissolution stage, evaporating the rest of its amount and separating the table salt. During the subsequent processing of the solutions after separation of the table salt, Cainite and carnallite flj are obtained.

The disadvantage of this method is the low degree of shenit (36.7 kg per 100 kg

ORE.

The purpose of the invention is to increase the yield of chenit1

The goal is achieved according to a method for separating chenite from polymineral ores, including dissolving the ore in the reverse uterine

sludge solution, sludge separation, cooling the obtained shenit solution, separating shenite, returning 65-75% of the mother liquor to the ore dissolution stage, evaporating the rest of the mother liquor and separating the sodium chloride, before evaporation the shenit mother liquor is treated with monohydro-oral phosphate 10 Fat sodium in a molar ratio to magnesium containing in solution equal to (0.55-0 ,, and the precipitate is separated. V

It is advisable to direct the solution after separation of sodium chloride to the stage of cooling the shenitic solution.

The proposed method allows to increase the yield of chenite to 38.4 kg per

20 100 kg of ore and at the same time receive highly concentrated magnesium-containing fertilizer.

The molar ratio of sodium monohydrogen phosphate to magnesium greater than 25 0.65 leads to a mother liquor, from which sulphates are emitted during evaporation along with sodium chloride, which leads to contamination of sodium chloride and a decrease in

30 yields of chenite, and the ratio of sodium monohydroportate sodium to magnesium less than 0.55 leads to an accumulation of magnesium in the system. Example 1. 100 kg of polymineral potassium ore, composition, weight. %: K 9.14} Md 3.66; Ca 1.66, Na 13.09-, C1 26.68; 504-20,88; the insoluble residue is 17.58 and, 31 is dissolved at 300.0 kg of diluting liquor, composition, weight. %; K 4.03; Md 3.07; Na 4.28; Cl 15.60; I5Of 4.93; Htp 68.09. At the same time, 76.5 kg of a mixture of halite dump and insoluble residue and 323.1 kg of saturated solution are isolated, which is fed to the crystallization of shenite. 39.6 kg of the solution obtained after evaporation and separation of sodium chloride from an excess shenit mother liquor is also fed to the crystallization. The cooling temperature of shenitic pulp at the crystallization stage of 20 ° C. At this stage, 38.4 kg of shenite are separated, the composition of wt.%: K 18.05; Md 5.60; Na 0.96; C1 3.09; SO 42.27; 30.03 and 324.0 kg shenitovogo stock solution, composition, weight. %: K 3.91; Eid 3.65; Na3.57 Cl, 15.33; ID 6.09; 67.45. The chenitic uterine solution is divided into two parts: 242.9 kg is directed to the preparation of the solvent liquor, and 81.1 kg to the precipitation of dimagnium phosphate. 19.9 kg of a 48% disodium phosphate solution, i.e. the ratio of disodium phosphate to magnesium is 0.55: 1. The precipitate of di-magnesium phosphate, separated by filtration, after washing with water (3.0 kg) is 11.7 kg and has a composition, weight. %: Md 11.54-; HPQ 44.8 41.37; K 0.10; Na 0.10; 804 1.88 C1 0.20. The mother liquor after separation of dimagnesium phosphate has a composition, weight. % K 3.56; MD 1.45; Na 6.73; Cl 13.97; .So 5.23} 69.06. It is evaporated until 37.9 kg of water is removed. The suspension is filtered out and get 12.1 kg of salt, composition, weight. %: Na 36.73; C1 55.84; K 0.75; Md 0.25; SO 2.00; 5, 43 and 39.6 kg of one stripped off solution, composition, weight. %: K 7.69; Md 3.23; Na 3.98; C1 14.36; SO. 11.50; N.O. 59.24. Example 2. 323.1 kg of the saturated solution obtained in the sample of the screw and 39.3 kg of the evaporated solution are fed to the crystallization of shenite. The temperature of the cooled shenitic pulp is. At the stage of crystallization, 38.4 kg of chenite are separated; composition, weight. %: K 18,12; Md.5,69; Na 1.07; Cl 3.25; ID 43.03 - 28.84 and 323.9 kg of Chenitic maternal solution, composition, weight. %: K 3.87; Nd 3.67; Na 3.57; Cl 15.30; 504 6.05; Hjp 67.54. The chenite mother liquor is divided into two portions of 242.8 kg which are used for the preparation of a solvent liquor, and 81.1 kg of precipitation of dimagnesium phosphate. 21.6 kg of a 48% disodium phosphate solution, i.e. the ratio of disodium phosphate to magnesium is 0.60: 1. The precipitate of di-magnesium phosphate, separated by filtration, after being wetted with water (3 kg) is 13.0 kg and has a composition, wt. %: Md 11.54; HPOI 33.69; K 0.14; Na 0.24; Cl, 0.21; SO. 2.07 and 41.11. The mother liquor has a composition, weight. %: K 3.53; Md 1.32; At 6.98; C1 13.86; S04 5.17; 69.14. The yoke is evaporated at 38.2 kg of water before removal. The suspension is filtered out and 12.2 kg of salt is obtained, the composition, weight. %: Na 36.97; C1 55.94; K 0.66; Md 0.18; 50 0.90; 5.35 and 39.3 kg of one stripped off of the solutions, composition, weight. %: K 7.82; Mq 2.95; Na 4.53; Cl 14.31; SO .. 11.43; BUT 58.96. Example 3. 323.1 kg of the saturated solution obtained in Example 1 and 39.9 kg of the evaporated solution are fed to the crystallization of shenite. The temperature of the cooled slurry is. At the stage of crystallization, 38.5 kg of chenite are separated; composition, weight. %: K 17.97; Md 5.57; Na 1,00; Cl 3.10; SO. 42.80; 29.65 and 323.9 kg shenitovogo stock solution composition, weight. %: K 3.90; MD 3.71; By 3.58; C1 15.32; 804 6.15 And Hjp 67.34. The chenite mother liquor is divided into two parts: 242.8 kg is directed to the preparation of the dissolving liquor, and 81.1 kg is directed to the precipitation of dimagnesium phosphate. 23.8 kg of a 48% dimagnesium phosphate solution, i.e. the ratio of disodium phosphate to magnesium is 0.65: 1. The precipitate was filtered off and washed with water (3 kg). Its weight is 14, 3 kg, and the chemical composition is as follows, wt%: Md 11.55; HP04.45; K 0.13; Na 0.17; C1 0.18; 5D2,09; 40.28. The mother liquor after separation of dimagnesium phosphate has a composition, weight. %: K 3.46; Md 1.17; Na 7.31; Cl 13.70; $ 04 5.21 and H.O 69.15. It is evaporated at. 85 seconds before the removal of 38.5 kg of water. The suspension. dissolve and get 12.3 kg of salt, composition, weight. %: Na 37.02; Cl 55.13; K 0.80; Mg 0.17; SO 1.02; Hj.O 5.26 and 39.9 kg of one stripped off solution of the composition, weight. %: K7.63) Md 2.64; Na 5.22; Cl 13.93; SO r 11, 55 and HgO 59.03. The implementation of the proposed method allows an increase in the yield of chenite.

to obtain magnesium phosphate fertilizer at the same time, to simplify the processing scheme of polymineral potash ores, eliminate the stages of obtaining kainit and carnallite and reduce the amount of waste in the form of gypsum.

Claims (2)

1. A method for isolating chenite from polymineral potash ores, including dissolving ore in a reverse chenitic solution, separating sludge, cooling the resulting chenitic solution, separating chenite, 3 gate 65.-75% mother liquor at the stage of dissolving the ore, evaporating the remaining colloid of the mother liquor and separating salt, characterized in that / in order to increase the yield of the product, before evaporation, the shenit mother liquor is treated with sodium monohydroorphosphate in a molar ratio to the content in the magnesium in the solution (0.55-0.65;: 1) and the precipitate is separated. 2. Method by ft. 1, and that the solution, after separation of the sodium chloride, sent dates to the cooling stage of the shenitic solution. Sources of information taken into account during the examination 1. USSR author's certificate 700444, cl. C 01 D 5/12, 1977.