Production system and production method for anhydrous aluminum fluoride

Abstract

The invention belongs to the technical field of aluminum fluoride production, concretely discloses a production system and a production method for anhydrous aluminum fluoride. The anhydrous aluminum fluoride production system comprises a hydrofluoric acid evaporator, wherein the hydrofluoric acid evaporator is connected in series to a tail gas heat exchanger, a tail gas outlet and a hydrogen fluoride gas outlet are provided with the tail gas heat exchanger, a tail gas washing apparatus is provided with the tail gas outlet, a gas mixing chamber is provided with the hydrogen fluoride gas outlet, a double-layer fluidized bed reactor is provided with a gas mixture outlet of the gas mixing chamber, the bottom of the double-layer fluidized bed reactor is provided with an aluminum fluoride product outlet, a high temperature tail gas outlet of the double-layer fluidized bed reactor is provided on the top, a reaction material inlet is provided on the double-layer fluidized bed reactor, a firstorder gas flow reactor is provided at the high temperature tail gas outlet of the double-layer fluidized bed reactor, the first order gas flow reactor is connected in series to a second order gas flow reactor, a third order gas flow reactor and a fourth order gas flow reactor, the second order gas flow reactor, the third order gas flow reactor and the fourth order gas flow reactor are communicated with the double-layer fluidized bed reactor, the fourth order gas flow reactor is communicated with the tail gas heat exchanger.

Description

technical field [0001] The invention relates to the technical field of aluminum fluoride production, in particular to a production system of anhydrous aluminum fluoride and a method for producing anhydrous aluminum fluoride using the system. Background technique [0002] Aluminum fluoride (AlF 3 ) is mainly used as a flux in aluminum electrolysis, which can reduce the electrolysis temperature, enhance the conductivity, adjust the electrolyte molecular ratio, and benefit the electrolysis of alumina and reduce energy consumption in the electrolysis process. Aluminum fluoride can also be used as an inhibitor of secondary fermentation in alcohol production, a flux for non-ferrous metals, a flux for ceramic glazes and enamel, etc. [0003] At present, various aluminum fluoride production processes at home and abroad can be divided into two categories: dry process and wet process. The wet process is basically the same in China at present, and they are all produced by fluorite...

AI Technical Summary

Problems solved by technology

Most of these processes use unpurified HF gas produced by high-grade fluorite, resulting in high raw material costs for aluminum fluoride products, high impurity content in products, and production capacity problems. At present, the production capacity of a single aluminum fluoride production unit used in China is the largest About 30,000 tons / year, the main equipment fluidized bed is the key

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