Desilication method in the dry type naluminum fluoride production
A technology of aluminum fluoride and desiliconization, applied in the direction of aluminum chloride, aluminum halide, etc., can solve problems such as high silica content, unqualified product quality, and difficulty in purchasing fluorite resources, and achieve easy process realization and easy operation Control, principle simple effect
Inactive Publication Date: 2008-03-12
宁夏金和化工有限公司
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Problems solved by technology
However, there are currently such problems: due to the increasing shortage of fluorspar resources in the market, it is difficult to purchase good-grade fluorspar resources, and low-grade fluorspar resources have a high silica content. Aluminum fluoride is easy to cause unqualified product quality
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[0010] Use three-stage fluorite and sulfuric acid to produce hydrogen fluoride gas in the acid furnace body, and then the mixed gas (mainly hydrogen fluoride gas, also containing impurity silicon tetrafluoride gas) produced in the acid furnace body enters the pre-purification through the gas guide pipe After the tower is cooled and washed by sulfuric acid, it enters the secondary washing tower for secondary washing, reaches the two-stage condenser, and changes the hydrogen fluoride gas into hydrofluoric acid liquid through temperature control. The temperature is controlled at -6 ~ -14 ° C, and part of the condensate is refluxed The hydrogen fluoride gas containing certain impurities coming out of the acid furnace body is washed in the washing tower, and the uncondensed silicon tetrafluoride gas is pumped to the tail gas purification system through the negative pressure of the fan and sprayed with water to absorb it into fluorosilicic acid liquid. After the hydrofluoric acid liq...
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The present invention relates to a desiliconization method in dry aluminum fluoride production and is characterized in that the hydrogen fluoride gas in the mixed gas prepared in an acid production furnace is condensed into hydrofluoric acid liquid and then the hydrofluoric acid liquid is vaporized into gas and sent to a fluidized bed after separating. The phase transition condensation point of the hydrogen fluoride gas is 19.5 degrees and the phase transition condensation point of the silicon tetrafluoride gas is 65 degrees below zero. The present invention makes use of the different condensation points of the hydrogen fluoride gas and the silicon tetrafluoride gas and leads the hydrogen fluoride gas to transfer into liquid through controlling a certain condensation temperature, thereby reaching the goal of separating with the silicon tetrafluoride gas. The present invention has the advantages of simple principle, easy flow realization and easy operation and control; simultaneously through practical operation, the silicon content in the aluminum fluoride products produced by three-grade fluorite is in the range of quality requirement and qualified products can be produced.
Description
technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a desiliconization method in dry aluminum fluoride production. Background technique [0002] In the prior art, the main process for producing dry-process aluminum fluoride is as follows: first, fluorite and sulfuric acid are used to produce hydrogen fluoride gas in the acid furnace body, and then part of the dust and part of sulfur trioxide are washed with sulfuric acid, and finally enter the multilayer flow The chemical bed reacts with aluminum hydroxide to produce aluminum fluoride. One of the main quality indicators of dry-process aluminum fluoride products is the content of silicon, and the source of its control is the content of silicon dioxide in the raw material fluorite. The main product generated by the reaction of fluorite and sulfuric acid in the acid furnace is hydrogen fluoride gas, which exists in the form of silicon tetrafluoride gas after reacting with ...
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IPC IPC(8): C01F7/62
Inventor 魏学谢永军曹永平刘生礼柴炯陈宁宇兰朝荣周忠淳李修勇孙日明
Owner 宁夏金和化工有限公司