SU686987A1 - Method of obtaining solution of potassium chloride - Google Patents

Description

(54) METHOD FOR PREPARING CHLORIDE SOLUTION

Potassium

one

The invention relates to methods for processing Shenitic liquors, which are formed during the complex processing of polymineral potash ores.

A known method of processing chloride-sulphate solutions, including their concentration, separation of sodium chloride and re-concentration of the remaining solution to precipitate chloride-sulphate salts 1,.

There is also known a method of obtaining a solution of potassium chloride, which includes evaporation of a solution containing chlorides and sulphates of sodium, potassium and magnesium, with separation of sodium chloride, re-evaporation of the solution with separation of artificial kakita and further evaporation with separation of carnallite 2.

The disadvantage of this method is the complexity of the process.

The purpose of the invention is to simplify the process by reducing the evaporation stages.

The goal is achieved by the proposed method, including the evaporation of a solution containing chlorides and sulphates of sodium, potassium and magnesium, and the separation of sodium chloride, and

after separation of sodium chloride, the solution is treated with a 2.7-5.4% solution of potassium hydroxide.

This makes it possible to exclude from the technological scheme the processing of chenite liquors the second and third stages of evaporation, the stage of decomposition of carnallite and the dissolution of potassium chloride. Alkali Concentration Used

0 due to the need to obtain 4 8% solution of potassium chloride, suitable for further use at the stage of obtaining potassium sulfate.

five

PRI im p . The original chenite liquor in the amount of 100.0 g of the composition, wt.%:, 98, 11, Na 3.95, cr 14.72, SO / 5.47, 68.77 is evaporated to remove 23.0 g of water. Pulp

0 filtered out and get 6.2 g of salt and 68.2 g of one of the evaporated silk composition, wt.%:

TO

5.60

Md

4.33

Na

2.47

SG 15.79

7.75 64.06,

Hgo

To one stripped off liquor is added at

Claims (2)

0 constant re-curing of 454.2 g of 3% potassium hydroxide solution. The hydroxide precipitation temperature is maintained at 85 ° C. After pulp filtration, 500, liquid phase composition, wt.%: No, 0.32 2.11 1.00 93.97, 5 g of contaminated hydroxide mg / day composition, wt.% G.Md {ON48.62 K 2.02 are obtained Na 0.15 CE o ,, 88 S0 “1.60 46.73. The filtered magnesium hydroxide is subjected to three times washing, each time giving 20 g of water. After washing, 13.1 g of Mg (OH) was isolated from the mixture, wt.%: MgfOHL53.66 K 0.09 Na0.01 DG0.04, 42, 78. DETAILED DESCRIPTION A method for producing a potassium chloride solution, comprising evaporating a solution containing sodium, potassium and magnesium chlorides and sulphates, and separating sodium chloride, which is the same, in order to simplify the process by reducing the evaporation steps after separation of sodium chloride, the solution is treated with 2.75, 4% potassium hydroxide solution. Sources of information taken into account in the examination 1. US patent 3432258, cl. 23-91, publ. 1964. 2. Technological regulations of the Kauta Chemical and Metallurgical Plant No. 44-72.