Device and method for producing regenerative electrolyte from aluminum-electrolysis carbon residues

Abstract

The invention relates to a device and a method for producing regenerative electrolyte from aluminum-electrolysis carbon residues. The device comprises a sorting platform, a carbon residue stock bin, a crushing device, a first magnetic separation device, a ball milling device, a flotation tank, a second magnetic separation device, a sedimentation basin, a feeding device, a drying device, a third magnetic separation device, an intermediate frequency furnace, a dust-removal device and a chimney, which are sequentially connected with one another, wherein a carbon powder tank, a filter-press device and a carbon powder bin are further sequentially connected to the flotation tank, and a regenerative electrolyte bin is connected to the intermediate frequency furnace. The method comprises the following steps: (a) raw material sorting, (b) carbon residue crushing, (c) ball-milling, (d) flotation, (e) drying, (f) regenerative electrolyte refining, and (g) tail gas treatment. The method has the beneficial effects that the carbon residues are sorted to be a utilizable value resource, and basically no industrial waste residue is generated; the process is simple, the processing cost is low, the industrialized application is easily realized, the production water supply is completely recycled in the whole process, no polluted gas is discharged, and the method is a brand new method for processing and comprehensively utilizing the carbon residues and has a high promotional value.

Description

technical field [0001] The invention relates to the technical field of waste recycling, in particular to a device and method for producing regenerated electrolyte by using aluminum electrolysis carbon slag. Background technique [0002] The aluminum industry is an important basic raw material industry for the development of the national economy. my country is the world's largest aluminum producer and aluminum consumer. In the process of aluminum electrolysis, the generation of aluminum electrolytic cell carbon slag (referred to as carbon slag) is inevitable. Rough calculations show that 5-10kg of carbon slag will be produced for every 1 ton of primary aluminum produced. According to the domestic production capacity of electrolytic aluminum reaching 25.5 million tons in 2011, 13,000-25,000 tons of carbon slag will be produced nationwide every year. The charcoal slag taken out contains a large amount of electrolytes, about 70%, mainly cryolite. Both the carbon and the electr...

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Problems solved by technology

[0005] 1. The production efficiency is low, and the three processes of carbon powder sedimentation, removal and air drying all take a long time, and the degree of automation is low, which is not conducive to large-scale mass production;

[0006] 2. Because the carbon powder products and regenerated electrolyte products produced by the traditional flotation method contain a large amount of fluorine, which is a highly toxic substance; the traditional stacking and air-drying process occupies a large area, and flying is prone to occur during transportation, stacking, and air-drying , leakage and other problems, which pose a great threat to the environment. At the same time, the product carbon powder and regenerated electrolyte are also easily polluted by flying dust, resulting in a decline in quality

[0007] 3. Among the recovered products, the recovered carbon powder products generally contain more than 7% of impurities such as fluorine, and the quality is far from meeting the raw material requirements of carbon products, and subsequent processing is difficult; the carbon content of recycled electrolyte products is also low. Usually greater than 3%, the silicon and iron content also exceeds the national cryolite product standard, and it is harmful to aluminum electrolysis production after being added to the electrolytic cell;

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