Potassium chloride production process for decomposing carnallite with cleaning solution

Abstract

The invention discloses a potassium chloride production process for decomposing carnallite with a cleaning solution. The potassium chloride production process is realized by the following steps of: a, dispersing carnallite by using a cleaning solution and putting the dispersed carnallite into a crystallizer; b, adding water in the crystallizer for decomposition, and controlling the concentration to be 31.5-31.7OBe'; c, subjecting a solution obtained after the decomposition to dehydration and separation to obtain crude potassium chloride and a decomposition solution; d, then, adding water into the crude potassium chloride for cleaning to obtain a potassium chloride solution with the concentration controlled to be 27-27.2OBe'; e, dehydrating the potassium chloride solution to obtain a potassium clloride product and a cleaning solution; and f, decomposing the carnallite by using the cleaning solution and repeating the steps b-e. By using the process disclosed by the invention, the carnallite is completely decomposed and particle uniformity of a product is ensured, and because the added water volume is reduced in a cleaning process, the losses of potassium chloride in the cleaning process are reduced.

Description

technical field [0001] The invention relates to the field of potassium chloride production technology, more specifically, relates to a potassium chloride production technology using washing liquid to decompose carnallite. Background technique [0002] In the process of producing potassium chloride, the evaporated liquid is separated from solid and liquid, cooled and crystallized to form carnallite (a double salt formed by potassium chloride, magnesium chloride and six crystal waters), carnallite is decomposed by adding water, dissolved Remove magnesium chloride and some other impurity salts to produce potassium chloride. The existing production process is that carnallite is dispersed into the crystallizer using the decomposition liquid, and in the crystallizer, it is decomposed by adding water, and the concentration is controlled at 31.7-31.9 〇 Be', decomposed to obtain crude potassium chloride, then washed with water, the concentration is controlled at 26.5-26.7 〇 Be', th...

AI Technical Summary

Problems solved by technology

[0003] 1. Use the decomposition liquid to disperse carnallite. The content of magnesium chloride in the solution is high, which is not conducive to the decomposition of carnallite

[0004] 2. Due to the incomplete decomposition of carnallite, the quality of crude potassium is not high, which affects the quality of finished products

[0005] 3. In order to pursue the qualified rate of the product, the amount of water added in the post-process is large, and the loss of potassium chloride increases, which reduces the extraction rate

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