Process for decomposing potassium feldspar by adopting low-temperature semidry method for comprehensive utilization

Abstract

The invention relates to potassium feldspar decomposition and comprehensive utilization technology and in particular relates to a process for decomposing potassium feldspar by adopting a low-temperature semidry method for comprehensive utilization. The process comprises the steps of fully mixing potassium feldspar, fluorite and sulfuric acid, then adding the mixture to a converter reactor to react at 180-250 DEG C, separating SiF4 and HF generated through a reaction from a system under the condition of negative pressure, carrying out absorption with ethanol and water solution to prepare white carbon black, recovering fluorine resources in the process from the solution in the forms of ammonium fluoride and other aids by adopting the method of adding ammonia water and applying the recovered fluorine sources to decomposition of potassium feldspar and carrying out a series of processes such as extraction on the solids after a reaction to obtain calcium sulfate whisker, potassium fluosilicate, aluminium hydroxide and ferric sulfate products. Compared with the method for decomposing potassium feldspar by a high temperature method, the process has the advantages that the reaction conditions are mild and the requirements for equipment are lower; the white carbon black is directly prepared through gas hydrolysis, thus avoiding the tedious course from solid phase separation; and the fluorine resources introduced to the decomposition course are recycled by adopting the mode of ammonium fluoride, thus avoiding waste of the fluorine resources.

Description

technical field [0001] The invention relates to a technology for comprehensive utilization of potassium feldspar decomposition, in particular to a process method for comprehensive utilization of potassium feldspar by using a low-temperature semi-dry method. The potassium feldspar is decomposed in a converter reactor at 180-250°C. Background technique [0002] At present, the reserves of soluble potash resources identified in my country are not large, and it is difficult to meet the agricultural demand for potash fertilizers. So far, 70% of potash fertilizers in China need to be imported. Therefore, potash mines are listed as one of the urgently needed minerals by the country. The reserves of soluble potassium salt resources in my country are small, but the reserves of insoluble potassium salt resources in my country are abundant. The insoluble potassium salt rocks represented by potassium feldspar are almost distributed in most provinces and regions of my country, and their ...

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Problems solved by technology

As far as the current potassium feldspar decomposition process is concerned, the main problems of the high temperature method are high energy consumption, high requirements on the material of the equipment, and serious pollution; although the low temperature solution method reduces the decomposition temperature, the subsequent separation process is relatively complicated. , still cannot solve the problem of high energy consumption

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