Method applied to acid-base combined extraction of aluminum, potassium and sodium from water-insoluble potassium ore

Abstract

The invention discloses a method applied to acid-base combined extraction of aluminum, potassium and sodium from water-insoluble potassium ore resource such as nepheline, potassium feldspar and the like. The method comprises the following steps: uniformly mixing finely-ground water-insoluble potassium ore with a proper amount of concentrated sulfuric acid, curing, and carrying out rapid high-temperature reduction roasting desulfurization at a certain temperature by a reducing agent, wherein the sulfur-containing flue gas is used for acid preparation to achieve regeneration and cyclic utilization of sulfuric acid; extracting potassium and sodium by water from the reduced calcine, and preparing aluminum oxide by alkaline leaching. By virtue of the method, the decomposition of aluminosilicate-containing material phase in the water-insoluble potassium ore resource such as nepheline, potassium feldspar and the like is enhanced by high-temperature reaction of concentrated sulfuric acid; the cyclic utilization of sulfuric acid is realized. The method can be used for comprehensively recycling aluminum, potassium and sodium resources; the recycling rate of aluminum oxide is high; the energy consumption is low; the corrosion to equipment is small; the large-scale industrialization is easy to implement.

Description

technical field [0001] The invention belongs to the comprehensive utilization of non-water-soluble potassium ore resources such as nepheline, potassium feldspar, potassium-rich shale and illite, and specifically relates to a method for extracting aluminum, potassium and sodium from water-insoluble potassium ore, especially The acid-base combined process is used for extraction. Background technique [0002] my country is a large agricultural country, and potash is very important to our country, but our country is poor in potash, accounting for only 1.63% of the world's total reserves. Although my country's water-soluble potash resources are poor, my country's non-water-soluble potash resources are rich and diverse , such as potassium feldspar, alunite, illite, potassium-rich shale, etc., and the reserves are huge. It is conservatively estimated that the total amount of resources exceeds 20 billion tons. If such water-insoluble potash resources can be utilized on a large scale...

AI Technical Summary

Problems solved by technology

However, various methods are either of high temperature and high energy consumption, complicated process routes, and high equipment requirements, so there is no value for industrial production, so the technology is difficult to promote

After the 1970s, there were few foreign research reports on the production of potassium salt from potassium feldspar

[0006] 1. Too high alkalinity

Excessively high alkalinity (>1.1) is unnecessary for the reduction reaction, but it will increase the melting point and viscosity of the charge, which is not conducive to the diffusion of the reduction reaction

[0007] 2. Furnace charges fluctuate greatly

During the operation of the blast furnace, the charge fluctuates greatly, causing scarring in the furnace, and the furnace condition is not smooth. It must be maintained at a relatively high furnace temperature, which reduces the economic benefits of production.

[0008] 3. Too frequent slagging

Avoid the disadvantages of high temperature sintering in current industrial applications, such as high energy consumption and large amount of slag

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