Production system and production method for anhydrous aluminum fluoride

A water fluoride, production system technology, applied in the direction of aluminum fluoride, aluminum halide, etc., can solve the problems of high impurity content in products, high raw material cost of aluminum fluoride products, etc., and achieve stable product quality, significant social and environmental benefits , the effect of reducing energy consumption

Active Publication Date: 2012-01-18
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Production system and production method for anhydrous aluminum fluoride
  • Production system and production method for anhydrous aluminum fluoride
  • Production system and production method for anhydrous aluminum fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 and Embodiment 2 are two specific embodiments of the anhydrous aluminum fluoride production system provided by the present application. Embodiment 3 and Embodiment 4 are two specific embodiments of the production method of anhydrous aluminum fluoride provided by the present application.

[0022] Example 1

[0023] Such as figure 1As shown, a production system of anhydrous aluminum fluoride includes a hydrofluoric acid evaporator 2, and the hydrofluoric acid evaporator 2 is provided with a hydrofluoric acid inlet 1 and a first outlet 3 of hydrogen fluoride gas, and a first outlet 3 of hydrogen fluoride gas Tail gas heat exchanger 6 is arranged in series, and tail gas heat exchanger 6 is provided with tail gas inlet 27, tail gas outlet 5 and hydrogen fluoride gas second outlet 4, and tail gas outlet 5 string is provided with tail gas washing device 7, and tail gas washing device 7 is provided with Tail gas evacuation pipeline 8, hydrogen fluoride gas second...

Embodiment 2

[0026] Such as figure 2 As shown, a production system of anhydrous aluminum fluoride includes a hydrofluoric acid evaporator 2, and the hydrofluoric acid evaporator 2 is provided with a hydrofluoric acid inlet 1 and a first outlet 3 of hydrogen fluoride gas, and a first outlet 3 of hydrogen fluoride gas A tail gas heat exchanger 6 is arranged in series, and the tail gas heat exchanger 6 is provided with a tail gas inlet 27, a tail gas outlet 5, and a second hydrogen fluoride gas outlet 4, and the tail gas outlet 5 is sequentially provided with a first Venturi scrubber 33, a second Venturi scrubber Li scrubber 34 and the 3rd Venturi scrubber 35, the first Venturi scrubber 33 is provided with the first Venturi scrubber tail gas inlet 32, the first Venturi scrubber tail gas inlet 32 ​​is arranged on the tail gas heat exchanger 6 The tail gas outlet 5 on the top is connected, the third Venturi scrubber 35 is provided with a tail gas emptying pipeline 8, and the first Venturi scru...

Embodiment 3

[0029] A kind of production method of anhydrous aluminum fluoride, concrete steps are:

[0030] (1) Anhydrous hydrofluoric acid feed

[0031] The anhydrous hydrofluoric acid pump sends 1000kg of anhydrous hydrofluoric acid to the hydrofluoric acid evaporator 2 after being metered by the flow meter and the control valve, and the anhydrous hydrofluoric acid is vaporized by steam heating in the hydrofluoric acid evaporator 2 Become hydrogen fluoride gas, then hydrogen fluoride gas flows out from hydrogen fluoride gas first outlet 3, enters tail gas heat exchanger 6 through control valve, carries out heat exchange with the tail gas from four-stage airflow reactor 10 in tail gas heat exchanger 6, then from hydrogen fluoride The gas second outlet 4 comes out and enters the gas mixing chamber 21, mixes with the hot air provided by the hot blast stove 20 in the gas mixing chamber 21, and is sent to the bottom of the double-layer fluidized bed reactor 25 through the mixed gas outlet 18...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/50
Inventor 李世江侯红军杨华春于贺华薛旭金李凌云高胜军尚钟声贾棉刘海霞
Owner DO FLUORIDE CHEM CO LTD
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