Soot treatment process in copper smelting process

Abstract

The invention provides a soot treatment process in a copper smelting process. The soot treatment process comprises the following steps: firstly carrying out water leaching on copper smelting soot to obtain a water leaching fluid and water leaching residues; then, carrying out acid leaching on one part of the water leaching residues obtained in the last step to obtain an acid leaching fluid, and carrying out alkali leaching on the other part of the water leaching residues to obtain an alkali leaching fluid; carrying out metal replacement on the acid leaching fluid obtained in the last step to precipitate copper to obtain copper-precipitated filtrate; and finally, neutralizing and oxidizing the copper-precipitated filtrate obtained in the last step and the alkali leaching fluid obtained in the last step to obtain ferric arsenate precipitates and arsenic-precipitated filtrate. The soot treatment process provided by the invention, especially the treatment process for high-arsenic high-copper soot realizes the hazard-free treatment effect of arsenic in the high-arsenic high-copper soot, and comprehensively recycles valuable metal copper, zinc and the like in the high-arsenic high-copper soot, so that gradient recycling and comprehensive utilization of soot impurities are realized.

Description

technical field [0001] The invention belongs to the technical field of copper smelting, and in particular relates to a soot treatment process in the copper smelting process. Background technique [0002] Copper smelting technology refers to the process of obtaining refined copper from copper ore through various process steps. The copper smelting industry is a basic industry in the national economy, especially in my country, which is in the stage of industrialization, and the demand for copper maintains a high-speed growth. The status of the smelting industry in the national economy has been continuously improved. At present, the copper smelting industry has entered a new round of industrial upgrading period, and the copper smelting industry is becoming increasingly collectivized, specialized, large-scale and internationalized. The development of copper smelting technology has gone through a long process, but so far copper smelting is still dominated by pyrometallurgy, and it...

AI Technical Summary

Problems solved by technology

The treatment of copper smelting soot was mainly fire method in the early days, so that zinc was separated out preferentially. It was treated with reverberatory furnace and electric arc furnace, and some were directly returned to smelting treatment. However, this not only reduced the ability of the smelting system to process concentrates, but also affected blister copper. quality, and the vicious cycle of impurities also affects production operations

The low level of comprehensive recovery, poor working conditions and pollution problems generally exist in the treatment of copper soot by pyrolysis. Therefore, metallurgists at home and abroad have studied new treatment methods, such as wet treatment of copper soot, etc.

[0004] However, due to the influence of copper concentrate raw materials, copper smelting process methods, and process conditions, the composition of copper soot in various copper factories is complex, and the phase composition fluctuates greatly, so it is difficult to have a unified treatment method

The soot in the copper smelting process contains valuable metals such as Cu, Pb, Zn, Bi, etc. The chemical composition is complex and difficult to handle, and it pollutes the environment. There is no mature and reliable technology in the world that can comprehensively recycle the above materials together.

If the soot is directly returned to the copper smelting system, it will not only greatly increase the impurity content of the furnace raw materials, deteriorate the furnace condition, and reduce the processing capacity of the furnace, but also the cyclic accumulation of As, Bi, Zn and other impurities will directly affect the quality of electrical copper

In addition, especially for high-arsenic soot with high arsenic content compared to other impurities, As will also affect the service life of acid-making catalysts and reduce SO 2 Conversion and sulfuric acid product quality

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