Preparation method of food-grade potassium chloride based on salt lake brine

Through the multiple grading and decomposition mechanism based on salt lake brine, high-purity food-grade potassium chloride was prepared, which solved the problems of low potassium resource utilization and low product purity in salt lakes, and achieved efficient and environmentally friendly potassium resource utilization and product purity improvement.

CN119706875APending Publication Date: 2025-03-28MINMETALS SALT LAKE CO LTD
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Patent Information

Application Number
CN202510036977.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-09
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the prior art, the comprehensive utilization rate of salt lake potassium resources is not high, resulting in serious waste of potassium resources. The production cost of food-grade potassium chloride is high and the purity is low, making it difficult to meet the quality requirements of the low-sodium salt industry and export potassium chloride.

Method used

The preparation method of food-grade potassium chloride based on salt lake brine is adopted, and high-purity potassium chloride is prepared by cold crystallization, positive flotation, reslurry washing, hot-soluble ultrafiltration, precipitation adsorption and concentration and drying, combined with multiple grading and decomposition mechanisms combined with dissolution crystallization, physical adsorption and chelating resin columns.

Benefits of technology

It effectively improves the utilization rate of potassium resources, reduces the introduction of impurities, improves the purity of products, and reduces production costs. This method is simple, convenient, green and environmentally friendly, and is suitable for industrial applications.

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Abstract

The invention relates to the technical field of potassium chloride extraction, and discloses a preparation method of food-grade potassium chloride based on salt lake brine. The method comprises the following steps of cold crystallization, direct flotation, re-pulp washing, hot melting ultrafiltration, precipitation adsorption and concentration drying. By adopting a multi-stage impurity removal mechanism combining elution crystallization, physical adsorption and a chelating resin column, the entrainment loss caused in an intermittent production process can be effectively reduced, the utilization rate of potassium resources is improved, other extra impurity ions are not introduced in the whole impurity removal process, the subsequent impurity removal burden is relieved, and the production cost is reduced. The method is simple, convenient, green and environment-friendly, the advantages of salt lake potassium resources are fully played, the potassium resources are comprehensively utilized to produce food-grade potassium chloride which is increasingly short in supply, and the great requirements of China for food-grade potassium chloride products are met.
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