Method for preparing potassium chloride from raw carnallite ore

Abstract

The invention provides a method for preparing potassium chloride from raw carnallite ore. The method comprises the following steps: carrying out flotation on raw carnallite ore slurry in a flotation device by using a flotation reagent to generate low-sodium carnallite slurry; decomposing and crystallizing the low-sodium carnallite slurry in a crystallizer to obtaining crystallizer underflow; screening the crystallizer underflow to obtain an oversize product and an undersize product, wherein the oversize product comprises undecomposed carnallite and sodium chloride particles, and the undersizeproduct is used for generating potassium chloride; and crushing the oversize product, detecting the content of sodium chloride in the crushed oversize product, and if the content of sodium chloride inthe oversize product is higher than a set value, applying the oversize product to generation of the low-sodium carnallite slurry, or if the content of sodium chloride in the oversize product is lowerthan the set value, applying the oversize product to generation of potassium chloride. Compared with the mode that the content of sodium chloride is not detected and oversize products are directly discharged, the method of the invention has the following advantages: materials in the oversize product are recycled again, and the utilization rate of the raw material in the production process is effectively increased.

Description

technical field [0001] The invention relates to a method for preparing potassium chloride from carnallite raw ore, in particular to a method for improving the utilization rate of carnallite raw ore. Background technique [0002] Potassium resources in China widely exist in remote areas such as Qinghai, among which the reserves in Qinghai account for more than 50% of the national reserves, and the representative resources are salt lake resources. At present, due to the continuous expansion of potash fertilizer production scale in the Salt Lake area and the gradual release of production capacity, starting from the brine mining area, there is a trend of shortage of raw brine and a decrease in potassium content of raw brine resources year by year. Along with the use of large particle carnallite raw ore (hereinafter referred to as raw ore) in recent years, sodium chloride content increases in the raw ore, causes potassium fertilizer production enterprise to produce such as the po...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing potassium chloride from carnallite raw ore, which is used to solve the problem of low utilization rate of raw materials and the recovery of the overall production process caused by the direct discharge of oversize to the outside of the production system in the prior art low rate problem

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