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Method for treating smelting slag through electrolytic reduction of molten aluminum salt

A molten salt electrolysis device and molten salt electrolysis technology are applied in the field of using aluminum molten salt electrolytic reduction to treat smelting slag. The process is controllable, the waste residue is greatly reduced and recycled, and the consumption of raw materials is less.

Active Publication Date: 2020-02-07
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the defects in the prior art such as incomplete reduction of smelting slag, large amount of waste slag, difficulty in resource utilization of waste slag, and low utilization rate of sensible heat of smelting slag, the purpose of the present invention is to provide a method for treating smelting slag by electrolytic reduction of molten aluminum salt. This method has the advantages of fast reduction speed, high-grade metal products formed in one step, short regeneration process, sensible heat of smelting slag can be used, and environmental pollution is small.

Method used

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  • Method for treating smelting slag through electrolytic reduction of molten aluminum salt

Examples

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Embodiment 1

[0055] First dry and dehydrate the raw materials except smelting slag until the water weight content is less than 0.1%, then mix the aluminum molten salt (95% cryolite and 5% alumina by mass fraction respectively) and put it into the fume collection hood In the aluminum electrolytic cell, the temperature is raised to 700 ° C, and then calcium chloride, aluminum fluoride, sodium hydroxide and calcium carbonate are added to the electrolytic cell in sequence, and the auxiliary materials mixed with calcium carbonate and molten copper converter slag containing iron and silicon are added. Copper converter slag, aluminum molten salt and auxiliary materials account for 10%, 80% and 10% of the mass fraction of the total charge respectively; 30%, 5%, 40%, 25%;

[0056] Using graphite as anode and cathode materials, maintain a constant temperature of 1300°C and control the tank pressure of 2.0V to carry out molten salt electrolysis for 1 hour; after the reaction is completed, the bottom ...

Embodiment 2

[0059] First dry and dehydrate the raw materials except smelting slag until the water weight content is less than 0.1%, and then mix the aluminum molten salt (cryolite with a mass fraction of 65% and alumina with a mass fraction of 35% respectively) and put it into a fume collection hood The aluminum electrolytic cell is heated to 600°C, and then the mixed auxiliary materials and the mixed smelting slag of molten steelmaking converter slag and blast furnace slag are added to the electrolytic cell in sequence (the mass ratio of steelmaking converter slag and blast furnace slag is 1:1 ), the molten mixed smelting slag, aluminum molten salt and auxiliary materials account for 80%, 15% and 5% of the mass fraction of the entire charge respectively; the auxiliary material components are sodium chloride and aluminum chloride mixture (sodium chloride and aluminum chloride mass ratio is 1:1), magnesium fluoride, potassium hydroxide, sodium carbonate and potassium carbonate mixture (mass...

Embodiment 3

[0063] First dry and dehydrate the raw materials except smelting slag until the water weight content is less than 0.1%, and then mix the aluminum molten salt (cryolite with a mass fraction of 75% and alumina with a mass fraction of 25% respectively) and put it into a fume collection hood In the aluminum electrolytic cell, the temperature is raised to 650 ° C, and then the mixed auxiliary materials and the red mud formed by aluminum smelting are added to the electrolytic cell in sequence, and the mass fraction of the red mud, aluminum molten salt and auxiliary materials accounted for 10% of the total feeding materials is respectively , 10% and 80%; the auxiliary material components are a mixture of magnesium chloride and potassium chloride (the mass ratio of magnesium chloride and potassium chloride is 1:1), a mixture of aluminum fluoride and calcium fluoride (the mass ratio of aluminum fluoride and calcium fluoride ratio of 1:1), calcium hydroxide, sodium carbonate and calcium ...

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Abstract

The invention relates to a treating technology of smelting slag containing iron and silicon, and particularly provides a method for treating smelting slag through electrolytic reduction of a molten aluminum salt. The technological process of the method comprises the following steps that firstly, raw materials except the smelting slag are fully dried and dehydrated, the molten aluminum salt is putinto an electrolytic bath with a gas collecting cover for heating, an auxiliary material and the smelting slag are added in sequence to be mixed so as to form a melt, an electrode is inserted, a direct current is introduced to carry out reduction reaction at a certain temperature and voltage, a slag layer and a liquid metal layer can be guided out through a slag tap and liquid discharging respectively to form a product after the reaction is finished, and a molten salt medium can be recycled. The method has the advantages that the process is simple, the metal reduction is thorough, the slag isgreatly reduced and recycled, the physical sensible heat of the smelting slag can be utilized in the process, and energy conservation and environmental protection are achieved.

Description

technical field [0001] The invention belongs to the field of smelting waste slag disposal, and in particular relates to a method for disposing of smelting slag by using aluminum molten salt electrolytic reduction. Background technique [0002] With the rapid development of the metallurgical industry, the resource and environmental problems faced by the industry have become increasingly prominent, which has become the lifeline of my country's smelting enterprises. Metal smelting slag has the characteristics of complex composition and great environmental hazards. It is a bulk industrial solid waste. Its comprehensive utilization is the difficulty of solid waste treatment and disposal. For example, non-ferrous smelting slag includes copper slag, lead-zinc slag, red mud, nickel-iron slag, vanadium Iron slag, etc. Black smelting slag includes steel slag, blast furnace slag, ferromanganese slag, etc. According to statistics, about 2-3 tons of slag will be produced for every 1 ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/36
CPCC25C3/36
Inventor 陈国宝马云瑞高世雄高富聪
Owner NORTHEASTERN UNIV LIAONING
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