Comprehensive utilization method for aluminum oxide red mud

A technology of alumina and red mud, which is applied in the fields of metallurgy and environmental protection, can solve the problems of insufficient utilization of red mud, land occupation, environmental pollution, etc., and achieve the effect of harmless treatment

Active Publication Date: 2017-08-22
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the red mud produced by the alumina plant is mainly disposed of on land. However, with the development of the aluminum industry, the amount of red mud discharged from the production of alumina is also increasing. A large amount of red mud cannot be fully and effectively used. Large-scale storage yards take up a lot of land and cause serious pollution to the environment

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  • Comprehensive utilization method for aluminum oxide red mud
  • Comprehensive utilization method for aluminum oxide red mud
  • Comprehensive utilization method for aluminum oxide red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Such as figure 1 As shown, the comprehensive utilization method of alumina red mud in this embodiment is as follows:

[0095] Take 1000g of alumina red mud, dry it at 200°C for 2 hours, then calcinate at 700°C for 2 hours, crush the calcined red mud to 100 mesh, and then mix it with 100 mesh carbon powder , under the pressure of 60MPa, the agglomeration is made, and the amount of carbon powder is mixed according to 100% of the theoretical amount. Put the prepared agglomerate into a vacuum reduction tank, put the vacuum reduction tank into a heating furnace and heat it to 1000°C, and carry out vacuum thermal reduction under the condition of a vacuum degree of 20Pa. After the reduction, the reduction slag was ground to 100 meshes and then subjected to magnetic separation. The slag (coarse iron powder) obtained by the magnetic separation was reduced by hydrogen to obtain 200 g of reduced iron powder, and the purity of the reduced iron powder reached 98 wt%.

[0096] Grin...

Embodiment 2

[0098] Such as figure 2 As shown, the comprehensive utilization method of alumina red mud in this embodiment is as follows:

[0099] Take 1000g of alumina red mud, dry it at 200°C for 3 hours, then calcinate it at 700°C for 2 hours, crush the calcined red mud to 100 mesh, and then mix it with 100 mesh carbon powder , under the pressure of 60MPa, the agglomeration is made, and the amount of carbon powder is mixed according to 100% of the theoretical amount. Put the prepared agglomerate into a vacuum reduction tank for reduction, put the vacuum reduction tank into a heating furnace and heat to 850°C, and perform vacuum thermal reduction under the condition of a vacuum degree of 1Pa. After the reduction, the reduction slag was ground to 100 meshes and then subjected to magnetic separation. The slag (coarse iron powder) obtained by the magnetic separation was reduced by hydrogen to obtain 200 g of reduced iron powder, and the purity of the reduced iron powder reached 98 wt%.

...

Embodiment 3

[0102] Such as image 3 As shown, the comprehensive utilization method of alumina red mud in this embodiment is as follows:

[0103] Take 1000g of alumina red mud, dry it at 200°C for 3 hours, then calcinate it at 600°C for 2 hours, crush the calcined red mud to 100 mesh, and then mix it with 100 mesh aluminum powder , the amount of aluminum powder added is 200 grams, the mixed material is made into agglomerates under a pressure of 60MPa, the prepared agglomerates are put into a vacuum reduction tank for reduction, and the vacuum reduction tank is put into a heating furnace and heated to 950°C. Vacuum thermal reduction is carried out under the condition that the degree of vacuum is 5Pa. After the reduction, 130 grams of sodium metal was collected on the crystallizer, and the crystallizer together with the sodium crystallized on it was put into another corundum crucible in a vacuum furnace and melted at a temperature of 300°C and a vacuum of 1Pa , and then break the vacuum to...

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Abstract

The invention belongs to the technical field of metallurgy and environmental protection, and particularly relates to a comprehensive utilization method for aluminum oxide red mud. The comprehensive utilization method for the aluminum oxide red mud aims at solving the problem that the aluminum oxide red mud is difficult to treat and recycle effectively, the red mud is treated by adopting a vacuum thermal reduction method, carbon or aluminum serves as a reducing agent, iron oxide in the red mud is reduced into metal iron under a vacuum condition, then iron in reducing slag is separated out through magnetic separation to be used for producing reduced iron powder, combined-state sodium oxide is reduced into metallic sodium and is distilled out, and therefore, the purposes of dealkalization and alkali recovery from the red mud can be achieved; and meanwhile, other valuable substances (such as scandium, niobium, cesium) in the red mud are reduced to metallic states and form an alloy with aluminum so as to be separated from the slag with the main components being silicon oxide and aluminum oxide, and therefore the effects of harmless treatment of the aluminum oxide red mud and comprehensive recovery and utilization of the valuable elements can be achieved, and no waste gas, waste water, waste slag or other secondary pollution is generated in the treatment process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and environmental protection, and in particular relates to a comprehensive utilization method of alumina red mud. Background technique [0002] In the process of alumina production, alumina in bauxite enters the solution in the form of sodium aluminate, and other substances that are insoluble in alkali enter into the dissolution slag to form red mud. Generally, about 0.5-2.5 tons of red mud are produced for every ton of alumina produced. my country is the largest country in alumina production. In recent years, alumina production has been maintained at about half of the world's total alumina production, which is about 60 million tons. , and the annual discharge of red mud is as high as hundreds of millions of tons. [0003] Because red mud contains a large amount of strong alkaline chemical substances, its pH value is still as high as 11 or above after being diluted 10 times. The extremely high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B1/24C21B13/04C22B34/12C22B26/10C22B5/10C22B5/04C22B34/24C22B59/00C22B34/22C22B19/30
CPCC21B13/04C22B1/02C22B1/24C22B5/04C22B5/10C22B7/001C22B19/30C22B26/10C22B34/1218C22B34/22C22B34/24C22B59/00Y02P10/20
Inventor 王耀武彭建平狄跃忠
Owner NORTHEASTERN UNIV
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