Method for producing potassium fertilizer and aluminum oxide by comprehensively using potassium feldspar

Abstract

The invention relates to a method for producing a potassium fertilizer and aluminum oxide by comprehensively using potassium feldspar. The method comprises the following steps of: (1) smashing potassium feldspar and inorganic chlorate, and burdening potassium feldspar, inorganic chlorate and potassium carbonate in the mass ratio of 1:(1-2):(1-10); (2) pelletizing the prepared material, and sintering at the temperature of 500-1,200 DEG C for 1-5 hours to obtain a sintered material and generate CO2 gas simultaneously; (3) soaking the material obtained in the step (2) into water and filtering; (4) introducing a filtrate obtained in the step (3) into the CO2 gas obtained in the step (2) to obtain an aluminum hydroxide precipitate, and filtering; (5) adding a filtrate obtained in the step (4) into nesquehonite, introducing CO2 gas to obtain a complex salt precipitate, filtering and crystalizing a filtrate to obtain a potassium chloride chemical fertilizer; and (6) adding water for dissolving a complex salt obtained in the step (5) to obtain a solid of nesquehonite, circularly using, heating a potassium bicarbonate solution for decomposing to obtain a potassium carbonate solution for circularly using, and repeating the step (1) to the step (6).

Description

technical field [0001] The invention relates to the comprehensive utilization of potassium feldspar, in particular to a method for comprehensively utilizing potassium feldspar to produce potash fertilizer and alumina. Background technique [0002] my country is the largest agricultural country in the world, and is currently facing many agricultural problems, the most important of which is the production and quality of grain. Potassium fertilizer, as a basic fertilizer, has obvious effects on promoting photosynthesis of crops, improving the absorption and utilization of nitrogen by crops, enhancing the stress resistance of crops, and increasing food production. At present, the supply of potassium salt (fertilizer) in my country is far from meeting the needs of industry and agriculture. Most of the potash fertilizer (nearly 80%) depends on imports. not high. my country is rich in insoluble potassium ore resources, with reserves of nearly 10 billion tons, distributed almost al...

AI Technical Summary

Problems solved by technology

The main problems of the current research method are: on the one hand, the energy consumption in the sintering process is high, and the requirements for equipment are also high; on the other hand, the dissolution rate of aluminum is not high, generally 50% to 80%. Converted to aluminosilicate and cannot be effectively utilized

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