Method and system for preparing potassium chloride from carnallite raw ore

Abstract

The invention discloses a method for preparing potassium chloride from carnallite raw ore. The method comprises the following steps of generating low-sodium carnallite slurry in a first flotation device from carnallite raw ore slurry; feeding the low-sodium carnallite slurry into a first screening device to obtain a first oversize product and a first undersize product; feeding the first oversize product into a crushing device, and returning the crushed first oversize product to the first flotation device; containing crystallizer underflow and crystallizer overflow liquid are from the first screen underflow in a crystallizer; conveying the bottom flow of the crystallizer into a second screening device to obtain a second oversize product and a second undersize product, conveying the second oversize product into the crushing device, and conveying the second undersize product into a fourth concentrating device for producing potassium chloride; and generating crude potassium slurry in the second flotation device form the overflow liquid of the crystallizer, and feeding the crude potassium slurry into the fourth concentrating device for producing potassium chloride. According to the method, the low-sodium carnallite ore pulp is subjected to circulating screening-crushing treatment, so that the particle size of the first screen underflow is uniform and stable, the crystallizer overflow liquid is subjected to reverse flotation again, and the potassium resource is recycled.

Description

technical field [0001] The invention relates to the technical field of potassium chloride production, in particular to a method and system for preparing potassium chloride from 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. The representative resources are salt lake resources, and the salt lake resources mainly include sedimentary resources and brine resources. Salt lake brine belongs to liquid chloride minerals Resources, rich in various components. Salt lake brine uses rich carnallite ore to process potassium chloride to produce potassium fertilizer. Potassium fertilizer is one of the three major chemical fertilizers of nitrogen and phosphorus and potassium. The life process plays a significant role, which is conducive to improving the water absorption in plants, the synthesis and transfer of sugars, and the u...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and system for producing potassium chloride from carnallite raw ore, which is used to solve the problem of potassium chloride caused by direct discharge of oversize and crystallizer overflow liquid to the tailing salt pond in the existing potash fertilizer production method. The problem of low recovery

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