System and method for treating red mud through electric arc furnace

An electric arc furnace and red mud technology, applied in the field of solid waste recycling, can solve the problem that red mud slag cannot be used in large quantities, and achieve the effects of solving solid waste stacking, satisfying the quality of fiber products and reducing energy consumption

Pending Publication Date: 2017-11-24
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in addition to the direct use of red mud, some studies have carried out iron extraction from red mud, and the red mud slag produced after the separation of slag and iron cannot be used in large quantities.

Method used

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  • System and method for treating red mud through electric arc furnace
  • System and method for treating red mud through electric arc furnace
  • System and method for treating red mud through electric arc furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Such as figure 2 As shown, in this embodiment, the above-mentioned system is used to process red mud, and the red mud of the alkali aluminum plant is used as raw material. The water content of the red mud is 38%. The chemical composition of its main elements is analyzed in Table 1 below.

[0060] Table 1 The main chemical composition of red mud wt.%

[0061]

[0062] R 2 O is a basic oxide, such as Na 2 O and K 2 One or two mixtures of O, because the elements are not fixed, so this representation is used.

[0063] The red mud with a water content of 38% is sent to the dehydration device for dehydration, and the water content of the red mud after pre-dehydration is reduced to 10%. Then the dehydrated red mud enters the mixing device through the belt conveyor, and a certain amount of coke powder and carbide slag enters the mixing device through the lower hopper to form a mixture. Among them, the proportion of coke powder and carbide slag ground to less than 200 m...

Embodiment 2

[0068] Such as figure 2 As shown, in this embodiment, the above-mentioned system is used to process red mud, and the red mud from the Alkali Aluminum Plant is used as the raw material. The water content of the red mud is 32%. The chemical composition of its main elements is analyzed in Table 3 below.

[0069] Table 3 The main chemical composition of red mud wt.%

[0070]

[0071] R 2 O is a basic oxide, such as Na 2 O and K 2 One or two mixtures of O, because the elements are not fixed, so this representation is used.

[0072] The red mud with a water content of 32% is sent to the dehydration device for dehydration, and the water content of the red mud after pre-dehydration is reduced to 10%. Then the dehydrated red mud enters the mixing device through the belt conveyor, and a certain amount of coke powder and carbide slag enters the mixing device through the lower hopper to form a mixture. Among them, the proportion of coke powder and carbide slag ground to less than...

Embodiment 3

[0077] Such as figure 2 As shown, in this embodiment, the above-mentioned system is used to process red mud, and the red mud of the alkali aluminum plant is used as raw material, and the water content of the red mud is 30%.

[0078] Table 5 Main chemical composition of red mud wt.%

[0079]

[0080] R 2 O is a basic oxide, such as Na 2 O and K 2 One or two mixtures of O, because the elements are not fixed, so this representation is used.

[0081] The red mud with a water content of 30% is sent to the dehydration device for dehydration, and the water content of the red mud after pre-dehydration is reduced to 10%. Then the dehydrated red mud enters the mixing device through the belt conveyor, and a certain amount of coke powder and carbide slag enters the mixing device through the lower hopper to form a mixture. Among them, the proportion of coke powder and carbide slag ground to less than 200 mesh is more than 60%, and the mass ratio of red mud, carbide slag and coke p...

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Abstract

The invention relates to a system for treating red mud through an electric arc furnace. The system comprises a dehydrating device, a material mixing device, a pelletizing device, a belt conveyer, a drying device, an automatic feeding device, the electric arc furnace, a temperature measuring device, a hardening and tempering device and a centrifuging device. The invention further relates to a method for treating the red mud through the electric arc furnace. The system and method are free of secondary pollution, sensible heat of thermal state slag is directly utilized, the operating cost is low, the waste heat recovery rate is high, the red mud is converted into cellucotton and metallic iron for sale, industrialized application of the red mud is promoted, and real harmless treatment, reduction and reclamation are achieved.

Description

technical field [0001] The invention relates to the field of solid waste resource treatment, in particular to a system and method for treating red mud in an electric arc furnace. Background technique [0002] In 2015, my country's alumina output was 58.98 million tons, and about 70 million tons of red mud were produced. By the end of 2015, the cumulative storage of red mud was about 380 million tons, and the utilization rate of red mud was less than 5%. per ton of Al produced 2 o 3 , can produce 1.0 to 1.8 tons of red mud. A large amount of red mud accumulation not only occupies land but also pollutes the environment, and it is a waste of resources. [0003] The utilization of red mud mainly includes three aspects: extraction of valuable metals, preparation of building materials and environmental adsorption materials. In the prior art, the red mud adopts reduction roasting-magnetic separation iron separation process. It is studied that red mud, sodium carbonate and 1% a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C21B13/12
CPCC22B1/2406C21B13/12C22B1/005
Inventor 边妙莲马冬阳孙辉陈士朝吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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