Method for preparing oxide of bimetal and hydrotalcite by using Bayer red mud as raw material

A technology for bimetallic oxides and hydrotalcites is applied in the field of preparing bimetallic oxides and hydrotalcites, which can solve the problems of low added value of products, and achieve the effects of low price, simple process flow and simplified production process.

Inactive Publication Date: 2005-03-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The added value of the product obtained by this method is low, it is difficult to compete with the existing iron ore, and it has not been put into use due to economic factors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Preparation of bimetallic oxides from brucite and Bayer red mud.

[0033] 1) Weigh 50 kg of brucite, grind it to less than 300 mesh, weigh 50 kg of Bayer red mud dry powder, add it to the mixer, add 350 kg of water, and stir evenly;

[0034] 2) Put the mixture on a filter cloth to filter and dehydrate, dry it and calcinate it at 500°C for 3 hours, cool it and grind it to less than 200 mesh for use.

Embodiment 2

[0035] Example 2: Preparation of bimetallic oxides from magnesite and Bayer red mud.

[0036]1) Weigh 150 kg of magnesite and heat it to 400°C, and keep the temperature constant for 3 hours to decompose it into MgO;

[0037] 2) Weigh 50 kg of Bayer red mud dry powder, add it to the mixer together with the MgO obtained in the previous step, then add 500 kg of water, and stir evenly;

[0038] 3) Put the mixture on a filter cloth to filter and dehydrate, dry it and calcinate it at 450°C for 3 hours, cool it and grind it to less than 200 mesh for use.

Embodiment 3

[0039] Example 3: Preparation of bimetallic oxides from commercial zinc oxide and Bayer red mud.

[0040] 1) Weigh 60 kg of commercial zinc oxide and 100 kg of Bayer red mud dry powder and add them to the mixer, then add 600 kg of water and stir evenly;

[0041] 2) Put the mixture on a filter cloth to filter and dehydrate, dry it and calcinate it at 750°C for 4 hours, cool it and grind it to less than 200 mesh for use.

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Abstract

The invention is to mix divalent metal oxide, hydroxide and red mud, then beating, drying and burning to produce divalent metal oxide which is hydrated in carbonate or bicarbonate solution to produce hydrotalcite. Said divalent oxide and hydrotalcite can be used as catalytic agent, catalytic agent carrier, infrared or ultraviolet absorbing and separating material, fire retardant and PVC stabilizer, they have strong adsorption to many harmful and poisonous negative ions.

Description

technical field [0001] The invention relates to a method for preparing double metal oxides and hydrotalcites by using industrial waste red mud formed in the production process of Bayer process alumina as raw materials. Background technique [0002] Red mud is the largest amount of waste in the alumina production process, and it is also the largest source of pollution. For every ton of alumina produced, about 0.5 to 2.0 tons of red mud are formed. At present, most of the alumina plants use wet method to build dams to stockpile red mud. This method is easy to cause the lye contained in the red mud to leak, pollute the groundwater, and cause soil salinization. If the red mud is dried and dehydrated and stacked, it will consume a lot of energy and still occupy land. The environmental hazards caused by red mud stacking have aroused social concern. [0003] At present, there are three methods of producing alumina in the world, namely Bayer method, sintering method and combined ...

Claims

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Application Information

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IPC IPC(8): C01G1/02C01G1/04
Inventor 叶瑛季珊珊邬黛黛叶葳陈志飞郑丽波李俊张维睿
Owner ZHEJIANG UNIV
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