Process for extracting potassium chloride from native sylvite ore

Abstract

The invention discloses a process for extracting potassium chloride from native sylvite ore, which comprises the following steps of: (1) crushing the ore: coarsely crushing the sylvite ore; (2) performing floatation: performing floatation in saturated motor solution at normal temperature and normal pressure, and adding an inhibitor modified cellulose, a collector alkyl fatty amine and an auxiliary collector unsaturated aliphatic hydrocarbon, wherein the floatation process comprises twice rougher floatation and twice concentration, and middlings in the concentration are sequentially returned for re-concentration; (3) dewatering and size mixing: dewatering products in a tank after primary rougher floatation and before secondary rougher floatation until the pulp concentration is 50 to 70 percent, and performing size mixing; and (4) washing concentrate: mixing washing water and a proper amount of floatation saturated mother solution, performing size mixing, washing and filtering on the floatation concentrate. The process ensures that the flow is reasonable, the selected granularity is high, the granularity of tailings is high, the ore is easy to dewater and convenient to refill, the energy consumption is low and the operation is simple, and is suitable for extracting a potassium chloride product used for agriculture and industry, which meets the national standard, from the native sylvite ore.

Description

technical field [0001] The invention relates to a process for extracting potassium chloride from potash halite ore, in particular to a process for extracting industrial and agricultural chlorinated chloride from primary potash halite ore through traditional positive flotation (coarse grain) Process for Potassium Products. Background technique [0002] Primary potassium halite is the main potassium-containing ore for the production of potassium chloride, and its main impurity is sodium chloride. The processing methods of this kind of ore at home and abroad mainly include dissolution crystallization method and flotation method. [0003] The dissolution crystallization method is to use the characteristics of different solubility of potassium chloride and sodium chloride in the solution at different temperatures to obtain potassium chloride by high-temperature dissolution and low-temperature crystallization separation. Well, the product has no chemical pollution. The disadvant...

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Problems solved by technology

At present, in the process of producing potassium chloride by flotation, there is a common problem of fine grinding particle size, which makes the grinding energy consumption high, and the product is inconvenient to use because the primary particles are relatively fine and easy to agglomerate and agglomerate. Flotation is an important development direction of the flotation process for the production of potassium chloride from potassium halite

[0005] However, the existing potassium halite coarse-grained flotation technology for producing potassium chloride has poor product quality and low potassium recovery rate, and there are no reports for production practice.

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