Method for separating potassium sulfate from sodium-potassium-sulfur-chlorine quaternary system

Abstract

The invention provides a method for separating potassium sulfate from a sodium-potassium-sulfur-chlorine quaternary system. The method is characterized by comprising the following steps: (1) adding sulfuric acid into a mixed system, performing gas-liquid separation, and condensing to recover diluted hydrochloric acid; (2) adding a neutralizer into the mixed solution obtained in the step (1), and regulating the pH value; (3) concentrating the mixed solution obtained in the step (2); and (4) performing evaporative crystallization on the concentrated solution obtained in the step (3), filtering and separating, and recovering the potassium sulfate crystal. The separation method provided by the invention is simple and rapid, the separating energy consumption is reduced, and valuable resources,particularly potassium salts, are effectively separated and recovered.

Description

technical field [0001] The invention belongs to the field of separation and relates to a method for separating potassium sulfate from a sodium-potassium-sulfur-chloride quaternary system. + and K + The method for separating sylvite in the chlorine-sulfate root mixture, specifically relates to a kind of Na + 、K + , SO 4 2- , Cl - A method for separating potassium sulfate in a quaternary system. Background technique [0002] In industry, there are often some containing Na + and K + Chlorine-sulfate mixed solution, especially in which the content of NaCl is higher than that of K 2 SO 4 , such solutions urgently need to recover valuable resources, especially potassium salts. How to separate the potassium sulfate with higher value, the traditional method is to add CaCl 2 , so that the sulfate in it is CaSO 4 Precipitate in the form of NaCl and KCl, and convert the solution into a mixed solution of NaCl and KCl. The further separation of NaCl and KCl generally adopts t...

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Problems solved by technology

How to separate the potassium sulfate with higher value, the traditional method is to add CaCl 2 , so that the sulfate in it is CaSO 4 Precipitate in the form of NaCl and KCl, and convert the solution into a mixed solution of NaCl and KCl. The further separation of NaCl and KCl generally adopts the method of evaporation concentration and multiple recrystallization. Because the solubility of NaCl and KCl is relatively large, there is a large energy consumption. , product CaSO 4 no export problem

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