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Technological process for preparing submicron alumina using improved salting out method

A process method and sub-micron technology, applied in chemical instruments and methods, improvement of process efficiency, inorganic chemistry, etc., can solve the problems of large distillation volume and high energy consumption for cooling and salting out

Inactive Publication Date: 2005-01-19
王海舟
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  • Abstract
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Problems solved by technology

However, the production of 99-99.9% alumina has the disadvantages of large distillation volume and high energy consumption for cooling and salting out.

Method used

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  • Technological process for preparing submicron alumina using improved salting out method

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Embodiment Construction

[0012] Below in conjunction with example the present invention is described in further detail.

[0013] Crush the kaolinite-type clay to 60-100 meshes, and roast at 700-760°C for 3 hours. Use circulating distillate, hydrochloric acid azeotropic liquid, and supplementary industrial hydrochloric acid to leach for 2 hours at 109°C, filter with a frame filter press, discharge the silicon slag from the stockyard, and extract the leachate with an organic solvent. Pass hydrogen chloride gas into the extracted liquid to carry out salting-out, the free acid at the end point of salting-out is 350-390g / l, the salting-out temperature is 60-25°C, and then filter, and the crystalline aluminum chloride is heated in a fluidized suspension furnace at 1220-1300 Calcination at ℃, phase inversion, salting-out mother liquor is sent to distillation, the final temperature of one distillation is 109-110 ℃, the distilled hydrogen chloride gas is sent to salting-out, after distillation, the liquid frac...

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Abstract

The invention relates to a process for preparing sub-micron aluminum oxide through improved salting out method comprising the steps of, subjecting the collyrium type clay to hydrochloric acid extraction, extraction, salting-out, thermal dissociation incineration and super fine integration, wherein the extracting agent employs tributyl phosphate, the thinning agent employs petroleum ether or sulphonated kerosene.

Description

technical field [0001] The invention relates to a process method for producing submicron alumina by hydrochloric acid method. Background technique [0002] my country's coal-measure kaolinite-type clay reserves amount to 11 billion tons, and 2.5 billion tons have been proven. It has the characteristics of high kaolinite content (over 95%) and easy mining. The use of kaolinite-type clay acid method to produce special alumina (alumina other than electrolytic aluminum application) has great economic significance, and it also has practical significance for the development of non-coal industries in the coal system. Chinese patent ZL95103368.9 is a process for producing alumina and alumina micro-powder by salting-out method, which can produce high-purity alumina powder due to repeated salting-out. However, the production of 99-99.9% alumina has the disadvantages of large distillation volume and high energy consumption for cooling and salting out. Contents of the invention [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/22C22B3/00C22B3/10C22B3/38
CPCY02P10/20
Inventor 王海舟
Owner 王海舟
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