During the industrial aluminium refining process, harmful solid waste - Spent Carbon Anode (SCA) is generated due to oxidation and slag loss on the surface of the anode carbon, erosion and scouring of the electrolyte solution and aluminum liquid. Therefore, this study uses a simple and clean flotation method to separate and purify the electrolyte from SCA using one-roughing and three-sweeping flotation process based on the characteristics of SCA. By means of analytical characterization, a high purity and recovered electrolyte is obtained, which can be returned to the electrolytic aluminum plant for secondary use. The harmless treatment and resource utilization of SCA is achieved, and the utilization rate of SCA is improved, which achieves the purpose of treating waste with waste.
1-methyl-2-pyrrolidone (NMP) is a good solvent with high solubility, high boiling point and high selectivity, which is widely used as a coating solvent in the preparation of cathode materials in the production of lithium-ion batteries. Since NMP is a costly solvent, and the waste gas containing NMP produced in the production process will cause pollution to the environment, it is necessary to recover NMP waste gas. In this paper, we studies the research technologies of NMP in lithium-ion battery production industry and draws some orientation.
The spent carbon anode (SCA) produced by electrolytic aluminum plants contains a large amount of fluoride salt electrolyte, which is harmful to the enterprises, environment and society. At present, the solution strategies of SCA produced by electrolytic aluminum plants mainly include flotation, roasting, vacuum smelting, fluidized bed technology and safe landfill, but only the flotation method does not produce toxic and harmful substances which is a relatively clean treatment method. However, in the past, the focus of flotation treatment of SCA was to separate and purify the carbon of SCA to obtain high-purity carbon as recarburizer, battery anode material or fuel, which is a waste of the separated electrolyte. Therefore, the electrolyte in the SCA is recycled by the flotation method. The best flotation conditions are obtained through single factor experiment. Then, a new flotation process of one coarse and three sweeps are adopted to improve the purity and recovery rate of the electrolyte until it reaches the highest value. Thus, the electrolyte of treated SCA can be returned to the electrolytic aluminum plant to recycle or sell. Therefore, the harmlessness, resource utilization and reduction of solid waste are realized, and the social and economic benefits of the enterprise are improved with the utilization rate of SCA increased.
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