High-purity aluminum fluoride production technology

Abstract

The invention belongs to the technical field of aluminum fluoride production, and relates to a production technology of high-purity aluminum fluoride. The technology comprises the steps that: (1) hydrogen fluoride gas desiliconization is carried out, wherein fluorite and sulfuric acid are subjected to a reaction; produced hydrogen fluoride gas sequentially passes through a pre-purification tower and a purification tower, such that sulfuric acid washing and condensation are carried out; condensed acid overflows to a rectification tower through a crude acid tank, and is subjected to desiliconization; degassing is carried out in a degassing tower; and the obtained product overflows to a finished product tank through a rectified acid cooling device; (2) anhydrous hydrogen fluoride evaporation is carried out, wherein the finished product acid is pumped into a hydrogen fluoride distillation tower kettle by using a submerged pump; evaporation is carried out by using an evaporator in the tower kettle; hydrogen fluoride gas after evaporation is delivered through an integral superheater in the tower kettle, and directly flows into a fluidized bed; and (3) aluminum fluoride is produced, wherein the hydrogen fluoride gas enters the fluidized bed and is subjected to a reaction with aluminum hydroxide, such that aluminum fluoride is produced. According to the invention, because anhydrous hydrogen fluoride is adopted as a raw material, and the desiliconization treatment is carried out in the preparation process, the produced aluminum fluoride has the advantages of high purity, low silicon dioxide content, low discretionary reduction amount, and simple and feasible production process.

Description

technical field [0001] The invention belongs to the technical field of aluminum fluoride production and relates to a production process of high-purity aluminum fluoride. Background technique [0002] Aluminum fluoride is mainly used as a flux for electrolytic aluminum to adjust the performance of the electrolyte, enhance the conductivity, reduce the electrolysis temperature, and benefit the electrolysis of alumina and reduce the energy consumption of the electrolysis process. The performance and quality of aluminum fluoride are directly related to the energy consumption and pollutant emissions in the electrolytic aluminum production process. Aluminum fluoride products with high performance and excellent quality will reduce the electricity consumption of electrolytic aluminum enterprises, reduce the emission of flue gas containing fluorine and sulfur, and be more conducive to the improvement of product quality and energy saving and emission reduction of electrolytic aluminum....

AI Technical Summary

Problems solved by technology

[0003] With the rapid growth of the number of aluminum fluoride production lines at home and abroad in recent years, the high-grade raw material fluorite ore is on the verge of being mined out. Low-grade fluorite ore and lower-grade fluorite ore are the inevitable trend of the aluminum fluoride production industry. However, The existing fluorite ore raw materials are not up to standard, forcing enterprises to improve the production process in order to ensure the quality of products

In fact, SiO in aluminum fluoride produced by conventional dry process 2 content is often exceeded

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