Al2O3, Cr2O3 composite nanofiber or nanosheet prepared from chromium-bearing aluminium sludge and preparation method thereof

A technology of composite nanofibers and nanosheets, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as unfavorable sustainable development of chromium salt industry, environmental pollution, waste of resources, etc. The product morphology and size are controllable, the operating cost is low, and the reaction speed is fast.

Inactive Publication Date: 2013-07-31
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only seriously pollutes the environment and occupies land, but also causes a huge waste of resources, which is not conducive to the sustainable development of my country's chromium salt industry

Method used

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  • Al2O3, Cr2O3 composite nanofiber or nanosheet prepared from chromium-bearing aluminium sludge and preparation method thereof
  • Al2O3, Cr2O3 composite nanofiber or nanosheet prepared from chromium-bearing aluminium sludge and preparation method thereof
  • Al2O3, Cr2O3 composite nanofiber or nanosheet prepared from chromium-bearing aluminium sludge and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Weigh 5 g of chromium-containing aluminum slime in a beaker, add 6 mol / L H at a solid-to-liquid ratio of 1:10 2 SO 4 solution, heated to dissolve, suction filtered to remove insoluble matter, retain the filtrate to obtain an acid solution containing chrome-aluminum mud. Add Primene JMT solution to the acid solution containing chrome-aluminum mud at a volume ratio of 1:5, shake at room temperature for 20 min, and let it stand until the solution is separated and the oil phase is removed. Determination of Cr in chromium-containing aluminum mud acid solution after iron removal 6+ content, according to the Cr 6+ reduced to Cr 3+ Required H 2 o 2 1.0 times of adding H 2 o 2 solution, stirred for 60 min, Cr 6+ reduced to Cr 3+. Use 0.5 mol / L NaOH solution to adjust the pH of the chromium-containing aluminum mud acid solution to 4.0 after reduction treatment to form Al(OH) 3 and Cr(OH) 3 The mixture was precipitated, left to stand for 20 h, and filtered with suction...

Embodiment 2

[0075] Weigh 5 g of chromium-containing aluminum slime in a beaker, add 12 mol / L H at a solid-to-liquid ratio of 1:2 2 SO 4 solution, heated to dissolve, suction filtered to remove insoluble matter, retain the filtrate to obtain an acid solution containing chrome-aluminum mud. Add TBP solution to the acid solution containing chromium-aluminum mud at a volume ratio of 1:0.1, shake at room temperature for 2 min, and let stand until the solution is separated and remove the oil phase. Determination of Cr in chromium-containing aluminum mud acid solution after iron removal 6+ content, according to the Cr 6+ reduced to Cr 3+ Required H 2 1.2 times of adding H 2 , stirring the reaction for 10 min, the Cr 6+ reduced to Cr 3+ . Use 1 mol / L NaOH solution to adjust the pH of the chromium-containing aluminic acid solution to 6.0 after reduction treatment to form Al(OH) 3 and Cr(OH) 3 The mixture was precipitated, left to stand for 0.5h, and filtered with suction to obtain Al(OH)...

Embodiment 3

[0078] Weigh 5 g of chromium-containing aluminum slime in a beaker, add 1mol / L H at a solid-to-liquid ratio of 1:50 2 SO 4 solution, heated to dissolve, suction filtered to remove insoluble matter, retain the filtrate to obtain an acid solution containing chrome-aluminum mud. Add N1923 solution to the acid solution containing chromium-aluminum mud at a volume ratio of 1:10, shake at room temperature for 60 min, and let it stand until the solution is separated and the oil phase is removed. Determination of Cr in chromium-containing aluminum mud acid solution after iron removal 6+ content, according to the Cr 6+ reduced to Cr 3+ Add ascorbic acid to 1.5 times of the required ascorbic acid, stir and react for 50 min, and Cr 6+ reduced to Cr 3+ . Use 8 mol / L KOH solution to adjust the pH=12.5 of chromium-containing aluminum mud acid solution after reduction treatment to form Al(OH) 3 and Cr(OH) 3 The mixture was precipitated, left to stand for 24h, and filtered with suctio...

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Abstract

The invention mainly relates to an Al2O3, Cr2O3 composite nanofiber or nanosheet prepared from chromium-bearing aluminium sludge and a preparation method thereof. The method is performed according to the following steps: dissolving aluminium sludge with acid, removing iron, reducing, preparing a mixture of Al(OH)3 and Cr(OH)3, preparing an Al2O3, Cr2O3 composite nanofiber or nanosheet precursor, and finally preparing the Al2O3, Cr2O3 composite nanofiber or nanosheet. The preparation method provided by the invention has advantages of rapid reaction speed, mild and safe condition, controllable morphology and size of the product and low cost, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of comprehensive application of chemical waste, in particular to an Al 2 o 3 、Cr 2 o 3 Composite nanofibers or nanosheets and methods for their preparation. Background technique [0002] At present, the rapid development of the metallurgical industry brings huge economic benefits, but also brings environmental problems caused by a large amount of metallurgical waste slag discharge and dumping. Therefore, the effective treatment and resource utilization of solid waste is of great significance to the sustainable development of our country. With the promotion of calcium-free roasting technology in the production of chromium products in my country, the amount of discarded chromium-containing aluminum sludge has increased sharply. The production of 1 ton of chromium products produces 6,000-7,000 tons of chromium-containing aluminum sludge on a dry basis, causing great pollution and harm to the environment. . The exist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08C01F7/02C01G37/033B82Y30/00
Inventor 孙彤李微
Owner BOHAI UNIV
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