A kind of method for stepwise separation and high-efficiency flotation of potassium salt ore to produce KCl

Abstract

The invention discloses a method for efficient flotation production of KCL through sequential separation of sylvite ore, and relates to a method for producing KCl from sylvite ore. According to the technical scheme, the method comprises the steps that after the sylvite ore is manufactured into the certain granularity, pulping, desalting, coarse KCL grain separation, coarse KCl grain washing, fine KCl grain floatation, fine KCl grain washing, dehydration and drying are performed to obtain crude KCl grain products and fine KCl grain products with the purity being 95% or more are obtained; on the basis of advanced separation of some NaCl tail salt and crude KCL grains before KCL floatation or during floatation, the KCL floatation amount is decreased, the floatation strength is lowered, the equipment input is decreased, the building investment is lowered, the floatation reagent consumption is reduced, the environment-friendly pressure is relieved, the mineral separation energy consumption is reduced, the production cost is lowered, the product type is optimized, the product quality is improved, and the KCL recycling rate is increased; the method is mainly used for washing machining of carnallite and sylvine ore of deposit mining.

Description

technical field [0001] The invention relates to a method for producing KCl by using potash ore, in particular to a method for producing KCl by stepwise separation and high-efficiency flotation of potash ore, which is mainly used for washing and processing of carnallite and potash salt ore mined in ore deposits. Background technique [0002] Potassium resources in the world mainly exist in solid and liquid forms, more than 90% are marine salt deposits, and a small part is potassium-bearing brine. The types of potassium salt deposits mainly include potassium halite (generally 25%-35% potassium chloride grade, mainly a mixture of potassium chloride and sodium chloride) and carnallite (generally 15%-20% potassium chloride grade %, mainly a mixture of carnallite and sodium chloride). Potassium resources in major potash producing countries such as Canada and Russia in the world are mainly potassium halite, and potassium resources in Laos and Congo are mainly carnallite ore. [0...

AI Technical Summary

Problems solved by technology

The traditional flotation process is mature and reliable, but before KCl flotation or during flotation, the materials are not effectively separated according to the material composition, particle size distribution and screening performance of KCl and NaCl, such as carnallite materials Before entering the flotation stage, part of the NaCl tailing salt and coarse KCl are not separated first, but are sent to the flotation stage together, or before the potash rock salt material enters the flotation selection stage, the coarse particle KCl is separated first, resulting in a large amount of flotation materials, high strength, large equipment selection, high construction investment and production costs, and low KCl recovery rate. At the same time, KCl is not properly classified according to the particle size distribution and sieving performance of KCl. , so the product is single and the particles are small, it is difficult to use carnallite and potassium halite ore to produce KCl products with high efficiency, low cost and high quality

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