A kind of method that takes carnallite as raw material to produce potassium sulfate

Abstract

The invention provides a method for producing potassium sulphate by using carnallite as raw materials. The method comprises the following steps of 1, proportioning and conversion: performing mixing proportioning and conversion on carnallite, sodium sulfate, water and system slurry to obtain soft leonite slurry; 2, soft leonite floatation: adding a soft leonite and sodium chloride saturated mother solution; adding a floatation agent for floatation and separation to obtain soft potassium concentrates and a first mother solution; 3, potassium sulphate conversion: mixing the soft potassium concentrates obtained in the second step with potassium chloride and water; performing conversion and separation to obtain potassium sulphate products and a second mother solution. The K2O content in the potassium sulphate products obtained by the method is greater than or equal to 50 percent; the GB20406-2006 agricultural first grade product requirements are met; the system total potassium yield is as high as 96.45 percent; the production cost is low; the mother solution utilization rate is high; the external discharge mother solution quantity per ton of products can be reduced by about 70 percent; the technical flow process is short; the production control operation is simple and convenient; the adaptability on raw materials is high; the yield of the potassium slat is high.

Description

technical field [0001] The invention relates to a method for producing potassium sulfate, in particular to a method for producing potassium sulfate by using carnallite and sodium sulfate as raw materials combined with a flotation process. Background technique [0002] Potassium sulfate is an important chlorine-free high-quality potassium fertilizer, which has a wide application range and good effect. The demand for agricultural production is increasing year by year, and the market prospect is very broad. Because its market price is about 1.5 to 2.0 times that of potassium chloride, many potassium chloride production enterprises seek product transformation and switch to potassium sulfate. [0003] At present, my country's proven potassium chloride resources are concentrated in Chaerhan Salt Lake, Qinghai, mainly using chloride-type potassium-containing brine as raw material, which is dried in salt fields to obtain salt field carnallite ore, and then further processed to obtai...

AI Technical Summary

Problems solved by technology

This method avoids the dissolution and mechanical removal of mirabilite ore, and simplifies the process flow, but there are generally technical defects such as large amount of material, low potassium yield and large amount of discharged mother liquor, and the conversion mother liquor is not rationally recycled.

[0006] The method for preparing potassium sulfate disclosed by CN104477943A is a method for stirring and transforming potassium mixed salt ore, potassium chloride, sodium sulfate and solvent into flotation langbeinite and transforming to produce potassium sulfate. Mixed salt ore has high mineral composition requirements, and is not suitable for the production of potassium sulfate from chloride-type salt lakes

This method is also only suitable for the production of potassium sulfate by using sulfate type brine as raw material

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