A comprehensive recovery process for selectively and efficiently extracting copper from lead matte

Abstract

The invention discloses a process for selective efficient copper extraction and comprehensive recovery from lead copper matte and belongs to the field of wet processes of non-ferrous metal metallurgy. According to the process disclosed by the invention, the lead copper matte is taken as a raw material, and the process comprises the following steps: crushing, grinding and screening the lead copper matte, performing pulp conditioning on the lead copper matte after screening and sulfuric acid (or a waste electrolyte), then pouring into a high-pressure kettle, performing leaching, adding an adjusting agent A and introducing pure oxygen; controlling technical conditions, oxidizing sulfur in the lead copper matte to elemental sulfur in the oxidization and leaching processes, and transferring into slag; oxidizing copper to enable the copper to enter a solution in the form of copper ions and enabling lead to leave in the slag in the form of lead sulfate with gold and silver; and enabling most of iron to enter into the slag in the forms of hematite and yellow calcium iron vitriol under high-temperature, high-pressure and high-acid conditions. After the completion of the leaching process, liquid-solid separation is performed to realize primary separation of the copper and other valuable elements; after acid adjustment of a leachate, cyclone electrolysis is directly performed to extract the copper in the leachate, and then a cathode copper product which is in line with a national standard can be obtained; and leaching residues are sent into a lead pyrometallurgy system for comprehensively recovering Pb, Ag, Au and other valuable elements.

Description

technical field [0001] The invention relates to a comprehensive recovery process for selectively and efficiently extracting copper from lead matte, which belongs to the field of nonferrous metal hydrometallurgy. Background technique [0002] Lead matte is PbS, Cu 2 The eutectic of sulfides such as S and FeS, which still contains metal sulfides such as ZnS and a small amount of AgS, and also melts part of the metal Ag, Au, Pt and other precious metals. Lead matte is mainly produced in the process of pyrometallurgy. Lead smelting bottom-blown furnace, side-blown furnace, blast furnace and lead scum reverberatory furnace all produce lead matte by-product. Due to the difference in raw material composition and operating system, the composition of lead matte produced in each process of lead smelting fluctuates widely, and the lead content and copper content fluctuate between 10-20% and 20-50% respectively. If it is directly sold as copper raw material For copper smelting enterpr...

AI Technical Summary

Problems solved by technology

Although this process can realize the selective leaching of metals, because the process conditions require a liquid-solid ratio of 10:1 to achieve the desired effect, it brings a lot of inconvenience to actual production. Because the liquid-solid ratio is too large, the copper content in the leaching solution is low. Lead to low electrodeposition efficiency and unqualified copper product quality

In addition, due to the generation of sulfur during the oxidation and leaching process of lead matte, it is easy to wrap the material, which leads to problems such as low copper leaching rate and low comprehensive recovery degree.

Images