Method for producing KCl from ground surface carnallite

Abstract

The invention relates to the field of potassium salt extraction from solid ores, particularly a method for producing KCl from ground surface carnallite, which comprises the following steps: 1) mixing ground surface carnallite with a high-Mg<2+> brine solution, and stirring to obtain a slurry; 2) sending the prepared slurry into a spiral particle grader to perform primary desliming; sending the coarse material subjected to particle gradation into a hydroclone to perform two-stage swirl desliming, and carrying out vacuum separation on the cyclone underflow, wherein the solid sample is deslimed carnallite; 3) carrying out cold decomposition on the deslimed carnallite for 20-30 minutes; and 4) adding a decomposition mother solution obtained by cold decomposition into the deslimed subjected to cold decomposition, adding a floatation agent, and carrying out two-refinement one-scavenging floatation to obtain KCl double-refined concentrate. The technique does not need any salt field solution mining or evaporation process, thereby saving the salt field construction cost and fresh water resources and greatly shortening the whole production process and production cycle for producing KCl from high-clay carnallite. Meanwhile, the method directly implements ore/clay physical separation, and generates the KCl product with the grade of at least 95%.

Description

technical field [0001] The invention relates to the field of extraction of potassium salt from solid ore, in particular, the invention relates to a method for producing KCl from surface carnallite ore. Background technique [0002] Nearly 60% of the proven potash resources in my country are mainly distributed in the Qaidam Basin of Qinghai Province, and the brine potash ore is the main one among these potash ore resources. A considerable part of the solid carnallite ore is high-clay ore. Most of these surface carnallite ores cannot be used due to low grade and large mud content. If these carnallite ores are directly decomposed-flotation, the product quality will be improved. Poor, large consumption of flotation reagents, low potassium yield, greatly reduced device production capacity, high economic costs and other problems. Therefore, before using this kind of ore, it should be considered to design high clay separation technology, use spiral separator, hydrocyclone and othe...

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Problems solved by technology

[0015] The Balun Mahai Dry Salt Lake in Haixi, Qinghai is rich in surface solid carnallite ore with high clay content. Based on the above-mentioned existing public production technology of potassium fertilizer, none of them can be used to directly produce high-grade KCl from this ore.

[0016] At present, potash fertilizer enterprises in the Mahai area basically leave the high-clay surface carnallite ore unused. Even small-scale mining uses solution mining technology to build large-scale salt pans, inject a large amount of fresh water, and then dissolve these surface carnallite ores. , and then evaporate until the carnallite ore is precipitated and reproduced. At present, there is no mature technology for directly mining and utilizing these surface carnallite ore

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