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Comprehensive reutilization technology for chromium-containing aluminium mud during production of chromium salt

A technology of chromium salt and chromium aluminum, which is applied in the field of comprehensive reuse of solid chemical waste slag, and can solve the problems of complex treatment process, high equipment requirements, and non-recycled products

Inactive Publication Date: 2014-10-15
唐翔 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent has the following problems: the main material components in the chromium-containing aluminum sludge are not well considered, the equipment used is high in requirements, large in investment, high in processing costs, complicated in the processing process, and the main products are not recycled
Therefore, using the patented process of this invention to process chromium-containing aluminum sludge has a serious loss and cannot meet the best treatment requirements.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] In order to perfect this invention patent and become a scientific and technological productivity, and serve the enterprise and society faster and better, in August 2012, the chromium-containing aluminum sludge of domestic calcium-free chromium salt production enterprises was implemented:

[0017] 1. Take 100kg of chromium-containing aluminum sludge and add 50kg of water to stir and dissolve, repeat twice to obtain filter residue aluminum sludge and filtrate;

[0018] 2. Add 50kg of sulfuric acid to the filter residue, stir and dissolve fully, add H 2 C 2 o 4 、Na 2 SO 3 , FeSO 4 Stir, add 40kg of alkali and stir, precipitate, filter, wash, separate, and dry to obtain products: 30kg of ferrochrome powder, 50kg of silica-alumina powder;

[0019] 3. Take 30kg of ferrochrome powder, add 20kg of sulfuric acid to dissolve, filter, wash, and dry to obtain the product Cr 2 o 3 12kg, add alkali to the filtrate and stir, precipitate, filter, wash, and dry to obtain the prod...

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Abstract

The invention discloses a comprehensive reutilization technology for chromium-containing aluminium mud during production of a chromium salt. A wet method is employed for processing the chromium-containing aluminium mud, pollution and harm of hexavalent chromium in the aluminium mud to human and environment are thoroughly removed, and substances in the aluminium mud can be used to directly prepare AI(OH)3, Fe(OH)3, NaCrO4, Cr2O3, Cr(OH)3, silicon powder and other products. The processing process does not cause secondary pollution, recovered products are good in quality and high in value, the processing cost is low, the technological flow is simple and rapid, the processing capacity is large and the effect is good, and the comprehensive reutilization technology is capable of greatly pushing development of circular economy, and has good environment benefit and social benefit.

Description

technical field [0001] The invention relates to a comprehensive recycling process of chromium-containing aluminum sludge in the production of chromium salts, which belongs to the field of comprehensive recycling of solid chemical waste residues, and is particularly suitable for the requirements of national green economic cycle development. Background technique [0002] At present, chromium salt enterprises at home and abroad are in a critical period of transformation and development. There are nearly 20 chemical chromium salt production enterprises, including 11 large-scale enterprises in China. In the production of chromium salt, 80kg to 200kg of chromium-containing aluminum sludge will be produced for every ton of chromium salt produced, and hundreds of thousands of tons of chromium-containing aluminum sludge will be produced every year. The hexavalent chromium contained in aluminum sludge will cause great harm to the human body and the environment. Domestic and foreign ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/06C22B3/44C22B21/00C22B34/32
CPCY02P10/20
Inventor 唐翔唐瑜
Owner 唐翔