Metallurgical process for recovering metal copper, lead, zinc and tin from copper refining waste slag

Abstract

The invention discloses a metallurgical process for recovering metal copper, lead, zinc and tin from copper refining waste slag, which uses waste liquid of zinc electrolysis with sulfuric acid or waste liquid of zinc electrolysis to perform the acid leaching; more than 95% of the zinc and copper are in the solution, the Fe 2+ in the solution is less than or equal to 1.5g / L; then the copper slag is used for removing chlorine; when the Cl- in the solution is less than or equal to 1.0g / L, the solution is sent to a copper electro-deposition; the electro-deposition decopperization can produce copper piece or copper powder; the decopperization neutralization is to add calcine or zinc oxide for neutralizing acid when the Cu2+ in the solution is less than or equal to 1.0g / L; lime is used for adjusting the pH value to 5.2-5.4; after purifying and removing residue of the zinc sulfate solution, the solution is sent to the zinc electro-deposition for producing zinc piece; the lean and tin pyrometallurgical purification is that, after more than 98% of lead and tin is sent to the acid leaching residue, the material of the acid leaching residue is balled and sent to a smelting furnace, so as to produce lead-tin alloy; the lead-tin alloy is directly sent to a vacuum fractionation furnace for purifying the lead and tin product; sulfur dioxide in the tail gas is absorbed by ammonia, so as to obtain ammonium sulphate product. The process is to extract copper and zinc joint wet process and to purify lead and tin by pyrometallurgical method; the process flow is effectively shortened, the metalrecovery rate and the resource utilization rate are both largely increased, and there is no secondary pollution in the process.

Description

technical field [0001] The invention belongs to the technical field of purification and smelting of complex and various metals, and is a brand-new method for comprehensive recycling of secondary resources of copper smelting waste slag, and relates to a new wet-fire method cleaning combined process for extracting copper, zinc, tin and lead Technology for metal products. Background technique [0002] Copper smelting waste slag contains copper, lead, zinc, tin, cadmium and other valuable metals, with considerable economic value; however, it also contains harmful impurities such as fluorine, chlorine, iron, etc., and the composition is quite complex. Low, many manufacturers want to use the existing smelting technology to extract these valuable metals, which is quite difficult, the cost is high, and there is no economic benefit. Therefore, copper smelting waste slag is in the development and utilization stage. [0003] It has been reported in the literature that the use of pyro-...

AI Technical Summary

Problems solved by technology

[0004] From the above process, it can be seen that the process is long, the layout of process equipment is difficult; the amount of slag is large, the requirements for waste gas treatment are high, the work of environmental governance is large; the investment scale is large; the production cost is high; the comprehensive recovery rate is not high

It is difficult to popularize, but it is still a good method. At present, there is no manufacturer who uses this process to treat copper smelting waste.

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