Method for preparing compound powder of alumina and chrome oxide from chromium-containing aluminum sludge

A composite powder, chromium oxide technology, applied in the direction of improving process efficiency, can solve problems such as pollution, and achieve the effects of no by-products, eradication of pollution problems, and control of product components

Inactive Publication Date: 2012-09-26
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing aluminum oxide and chromium oxide composite powders from chromium-conta

Method used

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  • Method for preparing compound powder of alumina and chrome oxide from chromium-containing aluminum sludge
  • Method for preparing compound powder of alumina and chrome oxide from chromium-containing aluminum sludge

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1:

[0028] Weigh 30 g of chromium-aluminum mud into a beaker, add 180 mL of 3 mol / L hydrochloric acid, heat to 80 ℃ under stirring, continue stirring, and keep it warm until all chromium-aluminum mud is dissolved to obtain an aluminum mud solution. Determine the concentration of Cr(Ⅲ), Cr(Ⅵ) and Al(Ⅲ) in the aluminum sludge dissolved solution and convert them to Cr 2 O 3 , Cr 2 O 3 , Al 2 O 3 The mass ratio is 1:1.5:100, adding 1 g of glucose, stirring, after the reaction is complete, standing, and cooling to room temperature. Add NaOH solution to pH 3.5, filter to remove Si and Fe impurities. Add 2.5 mL polyethylene glycol 400, mix well, add NaOH solution to pH 7.7 to obtain Al(OH) 3 , Cr(OH) 3 Mix the precipitate and obtain the filtrate and filter cake after filtration. The filter cake is washed with water until the washing liquid does not contain Cr (VI), and the washing liquid is combined into the filtrate. The filter cake was air-dried at 120 ℃ until the p...

Example Embodiment

[0029] Example 2:

[0030] Weigh 50 g of chromium-aluminum mud in a beaker, add 50 mL of 6 mol / L sulfuric acid, heat to 100 ℃ under stirring, continue stirring, and keep it warm until all chromium-aluminum mud is dissolved to obtain an aluminum mud solution. Determine the concentration of Cr(Ⅲ), Cr(Ⅵ) and Al(Ⅲ) in the aluminum sludge dissolved solution and convert them to Cr 2 O 3 , Cr 2 O 3 , Al 2 O 3 Calculate, the mass ratio is 2:1:100, add 2 g of sucrose, stir, after the reaction is complete, stand still and cool to 50°C. Add NaOH solution to pH 3.0, filter to remove Si and Fe impurities. Add 5 mL of absolute ethanol, mix well, add NaOH solution to pH 7 to obtain Al(OH) 3 , Cr(OH) 3 Mix the precipitate and obtain the filtrate and filter cake after filtration. The filter cake is washed with water until the washing liquid does not contain Cr (VI), and the washing liquid is combined into the filtrate. The filter cake was air-dried at 100 ℃ until the powder became dry and easi...

Example Embodiment

[0031] Example 3:

[0032] Weigh 30 g of chromium-containing aluminum mud into a beaker, add 150 mL of 5 mol / L nitric acid, heat to 30 ℃ under stirring, continue stirring, and keep the temperature until all the chromium-containing aluminum mud is dissolved to obtain an aluminum mud solution. Determine the concentration of Cr(Ⅲ), Cr(Ⅵ) and Al(Ⅲ) in the aluminum sludge dissolved solution and convert them to Cr 2 O 3 , Cr 2 O 3 , Al 2 O 3 Calculate, the mass ratio is 2:3:100, add 1 mL of formaldehyde, stir, after the reaction is complete, stand still and cool to room temperature. Add NaOH solution to pH 2.5, filter to remove Si and Fe impurities. Add 5g of sodium dodecyl sulfonate with the mass of the solution, mix well, add NaOH solution to pH 6.8 to obtain Al(OH) 3 , Cr(OH) 3 Mix precipitation. Add 0.3 mL of 5‰ polyacrylamide flocculant, filter after precipitation is complete, and obtain filtrate and filter cake. The filter cake is washed with water until the washing liquid doe...

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Abstract

The invention provides a method for preparing compound powder of alumina and chrome oxide from chromium-containing aluminum sludge. The method comprises that contents of Al, Cr, and Fe in the chromium-containing aluminum sludge are weighed, an inorganic acid solution is added according to the contents, and the mixture is heated and stirred until the mixture is completely dissolved; or that the chromium-containing aluminum sludge is heated, the inorganic acid solution is added, and the mixture is stirred while maintaining the temperature till the mixture is completely dissolved; that a required reducing agent is calculated and then added for reaction, after which the solution is kept stand and cooled; that the pH value of the solution is adjusted to 2.5-3.5, the solution is filtered to remove impurities, a liquid dispersant is added to mix the solution evenly, the PH value of the solution is then adjusted to 5.0-7.8 to generate a mixed deposition, the solution is filtered after full settlement to obtain a filtrate and a filter cake, the filter cake is washed till a washing solution contains no Cr(VI), and the washing solution is added into the filtrate; that the washed filter cake is dried; and that the object product is obtained by crushing, grinding and calcining. The method fundamentally solves environmental pollution of the chromium-containing aluminum sludge, and comprehensively utilizes the chromium-containing aluminum sludge. The method is simple in reaction processes and has no by-products, and products of the method are easy to control and reach nano-level granularity. Thus, the method can be used for producing grinding materials, cutting tools and refractory materials.

Description

technical field [0001] The invention relates to the harmless and comprehensive application field of hazardous chemical waste, in particular to a method for preparing aluminum oxide and chromium oxide composite powder by using chromium-containing aluminum mud. Background technique [0002] At present, there are more than 20 manufacturers of red alum and related products in my country. Due to the backward production technology of calcium roasting, about 4 to 5 million tons of chromium slag are improperly handled, causing great environmental pollution and waste of resources. The calcium-free roasting method to produce red alum sodium greatly reduces the amount of slag discharge, so that the problem of serious environmental pollution from chromium slag can be fundamentally controlled, and clean production is realized, which is in line with the national environmental protection industry policy; and the Cr(Ⅵ) content in the slag is reduced. It is more than 90% free of carcinogens,...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/06C22B3/46C22B21/00C22B34/32
CPCY02P10/20
Inventor 孙彤刘连利王莉丽张艳萍彭晓琳杨海龙
Owner BOHAI UNIV
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