Comprehensive recovery method of bismuth matte

Abstract

The invention relates to a hydrometallurgy technology for separating copper and bismuth from bismuth matte produced by a bismuth pyrometallurgy system and obtaining qualified copper products and belongs to the field of nonferrous metals hydrometallurgy. Bismuth matte is crushed, ground, sieved to be below -80 meshes and sent to a leaching tank for acid oxidation leaching, a leaching liquid is purified by a purifying agent and subjected to conventional copper electro-deposition treatment sequentially, and national standard copper products are obtained; after enrichment, leaching residues containing valuable metals such as lead, silver, sulfur and the like return to a lead smelting system for recovery, purifying residues containing the bismuth return to a bismuth smelting system for recovery of the bismuth. The recovery rate of valuable metals such as the copper, the silver, the sulfur, the bismuth, the lead and the like is high, the investment is low, energy consumption is low, no pollution is caused, no three-wastes are produced, green production is realized, and current environmental protection requirements are completely met.

Description

Technical field [0001] The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a comprehensive recovery method of bismuth copper matte. Background technique [0002] The raw material for bismuth extraction is mainly bismuth concentrate (with Bi 2 S 3 Mainly) and bismuth oxide produced during silver smelting with lead anode slime. These two raw materials contain Ag, Cu, Pb and other valuable metals to varying degrees. In order to ensure the quality of crude bismuth, elements such as Cu and Pb are effectively separated during the rough bismuth smelting process. The charge is 90% copper, 40% lead, 15-40% silver, 2~ 3% of bismuth enters into the copper matte phase, usually called bismuth matte. The mass percentage concentration of its chemical composition is: Cu20-40%, Fe2.5-15%, S8-20%, Pb9-38%, Sb0. 2 to 3%, Ag 0.65 to 4.15%, Bi 1.5 to 6%, As 0.3 to 1.5%, Zn 0.2 to 1.2%. With the development of bismuth metallurgy and the increase of lead out...

AI Technical Summary

Problems solved by technology

This method has been applied industrially, and there is no waste water discharge. However, the higher-value bismuth in bismuth matte is dispersed to varying degrees and has not been recovered. In the process of selling bismuth into the blister copper, it cannot be valued as an impurity, but because of Contains a variety of impurities to reduce its price; more than 90% of the silver in bismuth matte enters blister copper, resulting in silver loss. In addition, this method has low metal recovery, low processing capacity, high energy consumption, and high consumption of high-value reagents. , high cost and environmental pollution; and the method is difficult to miniaturize, and the bismuth matte output of general bismuth smelting enterprises is small, so it is not suitable to use the above method for processing. Therefore, in the prior art, it is usually only used as a copper raw material for commercial use

The acid leaching method is to carry out oxidation roasting desulfurization first, convert copper sulfide or cuprous sulfide into copper oxide or copper sulfate, then leaching copper with sulfuric acid and leaching bismuth with hydrochloric acid, so as to separate copper, bismuth from lead and silver. It is easy to sinter, and the oxidation of copper sulfide is not complete, resulting in low copper recovery rate, low concentration of sulfur dioxide produced in the process, and polluting the environment; - , Cl - It is an impurity that should be strictly controlled in the conventional hydrometallurgy zinc production process, which is not conducive to the large cycle production of hydrometallurgy zinc enterprises

[0003] For example, the patent application number is 201310288293.3, a lead matte fire treatment process, which uses reducing agent coke and flux sodium carbonate to reduce lead copper in lead matte to lead copper under high temperature conditions of 600-700 °C Alloy, while enriching zinc and iron impurities that are easy to remove in subsequent processes, so that most of the sulfur forms sodium sulfide, reducing SO 2 generation, reducing the SO 2 environmental pollution; but this method is only suitable for lead matte, and has special requirements for equipment, which inevitably produces low concentrations of SO 2 and smoke dust containing heavy metal lead, at the same time produce sodium sulfide scum containing heavy metal arsenic, lead, zinc, etc. It is difficult to deal with, and there is a problem of "three wastes" environmental pollution

[0004] In summary, the existing technology cannot adapt to the comprehensive recovery of valuable elements such as copper, sulfur, bismuth, lead and silver from bismuth matte. How to find a technically feasible and economically reasonable method suitable for processing bismuth matte , not only can solve the "resource" reuse of solid waste, and meet the requirements of national green production and circular economy, but also achieve greater economic and social benefits, which is a difficult problem to be further explored

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