A kind of method of producing high-quality potassium nitrate by potassium chloride and ammonium nitrate metathesis cycle method

Abstract

The invention discloses a potassium chloride and ammonium nitrate double decomposition and circulation method for producing high quality potassium nitrate. According to the method, potassium chloride and ammonium nitrate are taken as the raw materials, and the method comprises steps of raw material preparation, potassium nitrate crystallization, foam floatation and separation, potassium nitrate refinement, and ammonium chloride crystallization. The method is developed on the basis of conventional potassium nitrate production technology by improving part of the technology; wherein in the foam flotation and separation technology, in the presence of a floatation reagent (C12-C20 higher straight-chain aliphatic amine) and in a certain pH value range, the ammonium chloride and coarse potassium nitrate can be separated through foam entrainment; in the potassium nitrate refinement, the refined potassium mother liquid in the previous circulation is used to wash the coarse potassium nitrate, and then potassium nitrate is purified by sodium carbonate. In one aspect, the conventional potassium nitrate production technology is optimized, the potassium nitrate quality is improved, and the impurity content of the potassium nitrate product is greatly reduced. In the other aspect, the water using amount is reduced, the labor intensity is also reduced, and the production cost is saved. The industrial grade KNO3 mass content is not less than 99.7%, the content of Cl<-> is not more than 0.01%, and the content of NH4<+> is not more than 0.03%. the method has a wide application value and can generate prominent social benefit and economic benefit.

Description

technical field [0001] The invention relates to a method for producing high-quality potassium nitrate by a metathesis cycle method of potassium chloride and ammonium nitrate. Background technique [0002] Potassium nitrate is a colorless orthorhombic crystal or white powder, and is an important inorganic chemical product. According to the function and use of potassium nitrate, potassium nitrate can be divided into agricultural grade potassium nitrate and industrial grade potassium nitrate. Agricultural-grade potassium nitrate is mainly used as a high-quality chlorine-free potassium and nitrogen binary compound fertilizer for chlorine-sensitive crops, and it is called the "green potassium fertilizer" that is in short supply in the world; industrial-grade potassium nitrate, compared with agricultural Grade potassium nitrate, high quality, excellent performance, its purity is higher than 99.0%, widely used in national defense, military industry, special glass preparation and o...

AI Technical Summary

Problems solved by technology

[0014] After decades of development, although domestic potassium nitrate production enterprises have optimized and improved the traditional potassium nitrate production process to varying degrees, the series of drawbacks in traditional production have not been fundamentally resolved

To sum up, it is mainly reflected in two aspects: on the one hand, the ammonium chloride separation process is cumbersome, high energy consumption, and labor-intensive; on the other hand, the potassium nitrate product has high impurity content and poor quality, and the product quality cannot reach industrial grade potassium nitrate Quality Standard

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