A method for producing carnallite by using flotation tail salt

Abstract

The invention discloses a method for producing carnallite from flotation tailing salts. The method comprises the following steps: performing (S1200) tailing salt leaching, namely putting a solvent into flotation tailing salt slurry, and stirring so as to obtain a precipitate and a mother liquid, wherein the solvent comprises old brine, water and raw brine; the weight ratio of the old brine and thewater to the raw brine is (0.4-5:(0.2-3):(0-3); the old brine comprises the following components in percentage by weight: 0.1-0.8% of KCl, 30.5-35.0% of MgCl2, 0.1-0.8% of NaCl and 62.0-68.0% of H2O;adding the solvent according to the content of potassium chloride in a tailing salt solid, wherein the mass ratio of the solvent to the potassium chloride in dry substances of the tailing salt solidis (0.2-10):1. By adopting the method disclosed by the invention, a small amount of fresh water of the solvent is used in the whole process, no heating is needed, a small amount of energy is consumed,and the produced carnallite can be adopted to produce potassium chloride through obverse flotation and adverse flotation.

Description

technical field [0001] The invention relates to the technical field of potassium chloride production, in particular to a method for producing carnallite by using flotation tail salt. Background technique [0002] When potassium chloride is produced from salt lake mineral resources in the Chaerhan Salt Lake area, two production processes, forward flotation and reverse flotation, are mainly used. When the positive flotation method is used to produce potassium chloride, there will be a large amount of flotation tail salt slurry ( Including tail salt solids and tail liquid), the main component in the tail liquid is magnesium chloride, and a small amount of sodium chloride and potassium chloride (see Table 1 for components). [0003] Table 1 [0004] components KCl MgCl 2 NaCl content% 2-8 16-23 1-7 [0005] Main component is sodium chloride (more than 80%) in the tail salt solid, also has a small amount of potassium chloride and magnesium chlorid...

AI Technical Summary

Problems solved by technology

In the process of leaching and thawing, the consumption of fresh water is large, and the investment in mining and transportation equipment for potassium halite is also relatively high; finally, although the product obtained by the hot solution production of potassium chloride has a large particle size and high quality, the energy consumption is large and the equipment Severe corrosion and high production cost

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