Technique for producing aluminum fluoride by dry method

A production process, aluminum fluoride technology, applied in the field of dry aluminum fluoride production process, can solve the problems of pre-reactor production impact, improper control of reaction parameters, etc., to expand production capacity, improve equipment operation rate, and save equipment Maintenance cost and effect of investment

Inactive Publication Date: 2008-09-17
河南未来铝业(集团)有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a new dry-process aluminum fluoride production process, which solves various problems caused by improper control of reaction parameters in the pre-reactor, and also solves the problems caused by the maintenance of the pre-reactor on production. influences

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  • Technique for producing aluminum fluoride by dry method
  • Technique for producing aluminum fluoride by dry method

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Embodiment 1

[0017] Dry aluminum fluoride production process, adding concentrated sulfuric acid with a mass concentration of 98% and 105% nicotinic acid to the fuming acid reactor at room temperature, and the mixed acid obtained after mixing is fully reacted with fluorite in the reactor to obtain HF gas. After the HF gas is purified, it enters the fluidized bed from the bottom of the fluidized bed; the solid residue CaSO 4 One part returns to the kiln head from the kiln tail, and the other part is discharged through the slag discharge screw. Aluminum hydroxide enters the fluidized bed from the upper part of the fluidized bed, and reacts with HF gas entering the fluidized bed from the bottom to form AlF 3 and water. Coarse AlF 3 The material enters the cooler through the discharge screw, fine AlF 3 Materials and tail gas enter the first-stage cyclone for dust collection, and part of the fine material obtained by the first-stage dust collection enters the bottom of the fluidized bed and ...

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Abstract

The invention relates to a production process of dry method aluminum fluoride, which comprises the steps like preparation of HF gas, and the preparation of aluminum fluoride by means of HF and aluminum hydroxide; wherein, the preparation method for HF gas comprises the following step: concentrated sulphuric acid and nicotinic acid are added into a fuming acid reaction kettle and mixed, and the mixed acid obtained from the mixing adequately reacts with fluorite directly in a reaction furnace, so as to acquire HF gas. By obviating the steps of sulphuric acid preheating and pre-reactor reaction, the production process of dry method aluminum fluoride has the advantages of preventing a variety of problems due to the improper control of the reaction parameters in the pre-reactor, improving the running rate of equipment, saving the equipment maintenance costs and investments, lowering the labor intensity for workers, as well as bettering the production capacity of the overall process to approximately 25 thousand tons due to the absence of restriction of the two steps obviated.

Description

(1) Technical field [0001] The invention relates to a production process of dry-process aluminum fluoride. (2) Background technology [0002] The traditional dry aluminum fluoride production process is to add 98 acid (98% concentrated sulfuric acid) and 105 acid (fuming sulfuric acid) preheated by the heat exchanger into the oleum reactor, and the mixed acid obtained enters the pre-reactor. At the same time, the fluorite material is also added to the pre-reactor, the mixed acid is mixed with the fluorite and undergoes a preliminary reaction, and the pre-reacted material enters the reaction furnace for a full reaction. The reaction furnace adopts a rotary kiln, and the large ring gear of the reaction furnace The support ring is in the middle of the furnace, and the hot air system of the furnace is divided into three sections, with six hot air sealing surfaces. The hot air system adopted is in the form of three inlets and four outlets, and the generated solid residue CaSO 4 T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/50
Inventor 王志勇郎胜利廖学建王有伦
Owner 河南未来铝业(集团)有限公司
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