Process for producing potassium chloride by using potassic salt ores

Abstract

The invention discloses a process for producing potassium chloride by using potassic salt ores, which comprises the following steps: firstly, crushing potassic salt ores into particles with a size of 2-5 mm; then, adding the particles into a decomposition crystallizer through an electromagnetic oscillator, and simultaneously adding fresh water and circulated saturated fluid KCl-NaCl-MgCl2-H2O quanternary-system brine into the decomposition crystallizer, wherein in the process of adding, the circulated brine and raw ores are simultaneously fed into a reaction area of the decomposition crystallizer, and the fresh water is added at the junction of the reaction area and a crystallization area of the decomposition crystallizer; driving a bottom flow of the decomposition crystallizer into a flotation machine to carry out flotation, wherein the flotation is implemented sequentially through primary rougher flotation, primary scavenging and primary or secondary fine flotation; and carrying out washing, centrifugal dehydration and drying on concentrates subjected to fine flotation so as to obtain a potassium chloride product. The process disclosed by the invention is simple in production process and easy to operate, and has no restriction on the content of each component of the raw material potassic salt ores. Produced potassium chloride products are good in quality, large in particle size, and can be easily filtered and subjected to centrifugal dehydration, the energy consumption is reduced in the process of drying, and a phenomenon of blocking is uneasily caused, thereby bringing convenience to users.

Description

technical field [0001] The invention relates to a preparation process of potassium chloride, which is particularly suitable for preparing high-quality potassium chloride from carnallite ore. Background technique [0002] The methods for preparing potassium chloride from carnallite ore are generally divided into forward flotation method and reverse flotation-cold crystallization method. However, the positive flotation method used before is generally: carnallite → hydrolysis → flotation. After the carnallite is decomposed, it directly enters the flotation operation. The flotation generally adopts a roughing, a sweeping, and a second beneficiation. The second beneficiation concentrate is washed→dehydrated→dried to obtain potassium chloride product. The potassium chloride product obtained by this process has a fine particle size (the average particle size is only 0.074 mm), and the dehydration performance is poor. At the same time, due to the fine particle size of the potassium...

AI Technical Summary

Problems solved by technology

The potassium chloride product obtained by this process has a fine particle size (the average particle size is only 0.074 mm), and the dehydration performance is poor. At the same time, due to the fine particle size of the potassium chloride product and high energy consumption during drying, the production cost of the enterprise is increased; in addition, the product is easy to agglomerate , causing inconvenience to use