Process for producing aluminum oxide by using hydrochloric acid method

An alumina and hydrochloric acid process technology, applied in the chemical industry, inorganic chemistry, aluminum compounds, etc., can solve the problems of high decomposition heat consumption, equipment corrosion and wear, high cost, avoid the accumulation of impurities, increase economic benefits, and solve the problem of wear and tear Effect

Inactive Publication Date: 2014-08-06
四川纳动科技有限公司
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AI Technical Summary

Benefits of technology

This patented technology describes an improved way to manufacturing pure aluminums through traditional methods such as hydrocracking processes. By gradually adding water at different temperatures over several hours, it becomes possible to achieve higher yields without causing damage to equipment. Additionally, there are various techniques available like controlling pH levels, introducing hydroxyl groups on surfaces, adjusting concentrations of other substances involved in reaction chemistry, etc., resulting in better efficiency and cost savings compared to current technologies. Overall, these improvements improve the overall performance and economics of making highly pure alunites while reducing their impact upon environmental concerns.

Problems solved by technology

The present study discusses the challengings faced during the manufacturing processes used in this type of aluminate materials such as ceramics or glass industries. While traditional methods like sintering can efficiently separate out impurity elements without damaging other components, they may lead to excessive waste material disposal. Therefore, there is a desire to find alternatives to these existing techniques while maintaining their effectiveness over longer periods of time.

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  • Process for producing aluminum oxide by using hydrochloric acid method

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Embodiment 1

[0027]The low-grade bauxite is crushed and ground, and the output particle size of the ground is 75 μm. The grinding pulp is mixed with 31% hydrochloric acid and enters the dissolution system. The dissolution temperature is 120°C, the dissolution time is 2 hours, and the dissolution rate of aluminum reaches more than 95%. The dissolved ore pulp is separated and washed, and discharged to the acid slag yard. The separated crude liquid is fine-filtered with a pre-coated vertical leaf filter, and the obtained aluminum chloride semen contains 10 mg / L of floating matter. Concentrate the aluminum chloride semen to a concentration of 32% aluminum chloride by using a three-effect down-flow falling film evaporator, and then enter the acid analysis system. The acid analysis temperature is controlled at 45°C, and the crystallization residence time is 1 hour to obtain aluminum chloride hexahydrate with an average particle size of 0.5 mm and a purity of >99.7%, and the purity of alumina aft...

Embodiment 2

[0029] High-alumina circulating fluidized bed fly ash is mixed with 29% hydrochloric acid into the dissolution system, and the hydrochloric acid is mixed according to 95% of the theoretical required acid amount. The dissolution process parameters are: dissolution temperature 180°C, dissolution time 2.5h. At this time, the dissolution rate of aluminum reaches more than 90%, and the dissolution rate of iron is close to 100%. The dissolved ore pulp is separated and washed, and discharged to the acid slag stockpile. The separated crude liquid is fine-filtered with a pre-coated vertical leaf filter, and the obtained aluminum chloride semen has a float content of 5 mg / L. The aluminum chloride semen is concentrated to a concentration of 30% aluminum chloride by a four-effect down-flow falling film evaporator, and then enters the acid analysis system. The acid analysis temperature is controlled at 55°C, and the crystallization residence time is 0.5h to obtain aluminum chloride hexahy...

Embodiment 3

[0031] Aluminum hydroxide and 36% hydrochloric acid are mixed into the dissolution system, the dissolution temperature is 80°C, the dissolution time is 1h, and the dissolution rate of aluminum reaches 100%. After dissolution, aluminum chloride semen is obtained, the concentration of which is about 27%, and the content of suspended matter is <1mg / L. Aluminum chloride crystallizes into the acid analysis system. The acid analysis temperature is controlled at 15°C to obtain colloidal aluminum chloride hexahydrate with a purity of 99.999%, and ultrafine alumina with a purity of 99.997% after calcination.

[0032] Provided in the present invention such as figure 1 In the shown a kind of technology that adopts hydrochloric acid method to produce alumina,

[0033] ——The acid dissolution system adopts a semi-continuous or continuous dissolution process, and the preferred equipment is an enamel dissolution tank and a PTFE-lined dissolution tank; wherein, the process parameters of the ...

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Abstract

The invention belongs to the technical field of aluminum oxide extraction, and in particular discloses a process for producing aluminum oxide by using a hydrochloric acid method. The process comprises the following steps: crushing and grinding aluminum-containing mineral, mixing with hydrochloric acid, feeding into an acid digestion system, dissolving in acid, subsequently separating acid residues to obtain acid residues and a crude aluminum chloride liquid, washing the acid residues, feeding into a storage yard for stockpiling, performing refined filtration on the crude aluminum chloride liquid to obtain a refined aluminum chloride liquid, performing evaporation and concentration on the refined aluminum chloride liquid, and feeding into an aluminum chloride acidification system; separating and washing aluminum chloride crystals obtained after acidification, and feeding into an aluminum chloride calcining system; and calcining aluminum chloride crystals to obtain an aluminum oxide product. The process is particularly applicable to processes for producing aluminum oxide from non-bauxite resource such as coal ash, high silica bauxite, nepheline, clay and kaolin by using an acid method, and the prepared aluminum oxide can meet or be superior to national standard class or one-class aluminum oxide products, and can completely meet the requirements of electrolytic aluminum.

Description

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Claims

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Application Information

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Owner 四川纳动科技有限公司
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