Method for preparing superfine alumina-chromic oxide or alumina and chromic oxide by using aluminium-chromium mud

A technology of ultra-fine alumina and chromium oxide, applied in the direction of alumina/aluminum hydroxide, chromium trioxide, chromium oxide/hydrate, etc.

Inactive Publication Date: 2010-08-18
SHANGHAI UNIV
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Problems solved by technology

Another object of the present invention is to solve the problem of res

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Embodiment

[0038] In this embodiment, the method for preparing superfine alumina-chromia or alumina and oxidation with aluminum chromium mud, its specific preparation process and steps:

[0039] A. Preparation of ultra-fine alumina-chromium oxide with aluminum chrome mud

[0040] Take by weighing 45.093g of aluminum chromium mud, add appropriate amount of water, stir, obtain cloudy liquid; Adopt 250 mesh sieves to filter, then add the hydrochloric acid (concentration is 37wt%) of 147.2g in the cloudy liquid after filtering, make it dissolve And react, then filter, remove undissolved precipitation; Then add 0.4509g of dispersing agent polyethylene glycol in the remaining clear liquid; After fully stirring, add 200.7g ammoniacal liquor (concentration is 26wt%) again; Generate aluminum hydroxide and chromium hydroxide precipitation mixture, roast the resulting precipitation mixture at 250°C for thermal decomposition, and finally obtain ultrafine alumina-chromium oxide composite;

[0041] B. ...

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Abstract

The invention relates to a method for preparing superfine alumina-chromic oxide or alumina and chromic oxide by using aluminium-chromium mud which is a chromium ore industrial solid waste, belonging to the technical field of preparation processes of inorganic nonmetallic materials and waste solid recycling and regeneration. The method comprises the following steps of: taking the solid waste aluminium-chromium mud as raw material, washing, sieving, adding hydrochloric acid for dissolving, filtering to remove solid impurities, adding ammonia and polyethylene glycol in the filtrate to generate precipitation, filtering, and drying the precipitation to obtain a solid mixture of superfine aluminium hydroxide and chromium hydroxide. Superfine alumina-chromic oxide can be prepared by baking the solid mixture at the temperature of 250-300 DEG C after thermal decomposition. Superfine alumina can be prepared by adding hydrogen peroxide in the solid mixture, filtering, separating the precipitation and solution, drying the precipitation and baking at the temperature of 140-150 DEG C. Superfine chromic oxide can be finally obtained by adding proper amount of hydrochloric acid, sodium thiosulfate pentahydrate and polyethylene glycol in the solution, adjusting the pH of the solution to 1-1.5, adjusting the pH of the solution to 7-8 when the color of the solution is similarly green in the reaction process to enable chromium hydroxide to spontaneously deposit, and baking the obtained chromium hydroxide precipitation at the temperature of 200-300 DEG C.

Description

technical field [0001] The invention relates to a method for preparing superfine alumina-chromium oxide or alumina and chromium oxide by using aluminum-chromium sludge, which is industrial solid waste of chromium ore, and belongs to the technical field of preparation technology of inorganic non-metallic materials and the technical field of resource recycling and utilization of waste solids. Background technique [0002] Chromium is a strategic metal and ranks first. According to statistics, 76% of the world's chromium ore consumption is used in the metallurgical industry, 13% is used in refractory materials, and 11% is used in the chemical industry. The global reserves of chromium resources are not abundant, which is a scarce resource. my country's currently proven chromium ore reserves account for 0.825% of the world's total reserves, and more than 80% of annual consumption depends on imports, basically belonging to countries with poor chromium resources. Due to the gradua...

Claims

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Application Information

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IPC IPC(8): C22B7/00C01F7/02C01G37/033
CPCY02P10/20
Inventor 甄强高林倪亮袁强余敬世
Owner SHANGHAI UNIV
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