Research on optimization of copper electrolysis process indicators

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Pick the source: Yunnan Provincial Department of Science and Technology 2004-02-18 __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 　　This project is a self-selected topic of Yunnan Copper Co., Ltd. It is research conducted by enterprises in response to the problems and challenges they face for their own survival and development. The project started in January 1997, lasted nearly four years, and was basically completed in December 2000. 　　Our country is a copper-poor country, with a copper product gap rate as high as 40%, and needs to rely on large amounts of imports to meet domestic demand. Yunnan Copper Co., Ltd. is a large-scale copper smelting enterprise in my country. It was built in 1958 and put into production in 1962. After more than 30 years of construction and development, it has now reached an annual production capacity of more than 180,000 tons of high-purity cathode copper, becoming one of the top three players in China's copper smelting industry. However, due to the early construction of the factory, process selection, factory configuration, process parameter setting, technical condition selection and control were all affected by the understanding level, construction ideas, and * * The limitations and impacts of the overall economic and technological level. Therefore, there are many defects and it is difficult to adapt to the needs of actual development. 　　The project will be comprehensively researched and improved based on the existing equipment level. ； Research is carried out by exploring the principles of process control theory, improving control levels, and reducing production costs. 　　The project research involves copper electrolytic production practice and theoretical research. From the study of the physical phases and phase changes of various substances during the electrolysis process, to the improvement of the "homogenization" of the production process and technical conditions at various spatial points, lines, and surfaces in the production process ； From the exploration of the role and mechanism of additives to the development of new control methods for electrowinning arsenic removal ； From the extension of the production cycle of high-purity cathode copper to the solution of the "flower board" problem in the production of starter electrodes. 　　This project has achieved the following series of significant results:: 1. Equipment production capacity has been greatly improved: 1.1. The current density of high-purity cathode copper production increased from 230A/m2 to 272 A/m2, and the unit production capacity increased by 18%. 1.2. Continuous arsenic removal was achieved, reducing the number of arsenic removal electrolytic cells from 36 to 24. ； The current density increases to 195~320A/m2. And the arsenic removal equipment capacity has been increased by 210%. 2. The yin and yang cycle ratio of high-purity cathode copper production is increased from TK: TA = 3: 1 to TK: TA = 2: 1, which increases labor productivity by 88%. 3. Significantly reduces processing costs and can create benefits of 25.974 million yuan per year. And saved 7.9718 million yuan in equipment capital investment. 4. Solve the problem of AsH3 produced during the electrowinning arsenic removal process, ensuring and improving production safety and working environment quality. 5. The quality of high-purity cathode copper has been greatly improved, so that our company's high-purity cathode copper was successfully registered in the LME in March 1998. 　　Through the search and novelty search of the Yunnan Provincial Institute of Science and Technology Information, this project has the following innovation points: ①, By controlling the process conditions, copper ions and arsenic ions are discharged together at the anode to form an alloy mainly composed of Cu2As, thus achieving continuous arsenic removal. ； Sand filtration and special filter cloth with a membrane layer are used to separate micron-sized suspended solids in the copper electrolyte to achieve electrolyte purification. ②, Eliminate the problem of initial plate flower board by reducing the Cl- concentration of the electrolyte. 　　The results of this research have been fully put into production practice in Yunnan Copper Co., Ltd. in January 2001, and have achieved significant benefits. Since this study is based on the existing conditions of the enterprise ； Carry out work based on the principle of solving problems in a scientific and concise way. The effective combination of technology and economy was emphasized during the research process. Therefore, its economic and social benefits are very significant. Therefore, the results of this research can serve as a good reference for the transformation of similar domestic enterprises.