Copper smelting hazardous waste co-processing and valuable metal comprehensive recovery method

Abstract

The invention provides a copper smelting hazardous waste co-processing and valuable metal comprehensive recovery method which comprises the following steps of firstly, carrying out atmospheric pressure-pressurization two-stage countercurrent leaching on copper smelting smoke to obtain atmospheric pressure leachate and lead-silver-bismuth slag, and carrying out electrodeposition pre-copper removalon the atmospheric pressure leachate to obtain electrocoppered and pre-decoppered liquid; then adding arsenic sulfide slag into the pre-decoppered liquid for replacement and copper precipitation to obtain copper sulfide concentrate and copper precipitation post-liquid; and introducing SO2-containing flue gas into the copper precipitation post-liquid for reduction and arsenic precipitation, and obtaining arsenic trioxide and arsenic precipitation post-liquid. According to the copper smelting hazardous waste co-processing and valuable metal comprehensive recovery method provided by the invention, the waste residue recycling and harmless processing degree is high, the valuable metal comprehensive recovery effect is good, no waste acid, waste water or hazardous solid waste is generated in thewhole process, a new path is provided for copper smelting hazardous waste co-processing, and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the fields of non-ferrous metal smelting and environmental protection, in particular to a method for co-processing hazardous waste from copper smelting and comprehensively recovering valuable metals. Background technique [0002] The rapid development of the non-ferrous metal industry not only faces the shortage of primary minerals, but also increases the amount of hazardous waste generated during the smelting process. Copper smelting dust (white dust) produced during copper pyrometallurgy smelting and blowing process, lead-zinc soot produced by pyro-depletion of smelting slag, arsenic sulfide slag, lead filter cake and gypsum slag produced by polluted acid treatment, Hazardous wastes such as lead sulfate slag and silver separation slag produced in the anode slime treatment process contain a large amount of valuable metal elements, and the comprehensive and efficient recovery of the valuable elements is of great importance to d...

AI Technical Summary

Problems solved by technology

However, this method changes the S element from -2 to sulfate, and the waste acid treatment capacity is large, and the solution purification cost is high.

[0006] Another example is CN 108624759 A, which mixes white smoke with arsenic sulfide slag, then adds sulfuric acid to mix the slurry, and then conducts low-temperature indirect roasting to obtain arsenic trioxide and dearsenic calcine, and then acid leaches the dearsenic calcine, and then treats them separately Leaching solution and leaching slag, and finally obtain products such as bismuth, copper, and lead slag. This method converts arsenic into As through sulfuric acid aging and roasting conversion. 2 o 3 It enters the smoke and dust for recovery, realizing the preferential extraction of arsenic. The calcined sand is then leached with dilute sulfuric acid, and the leaching rate of Cu, Zn and other metals is relatively high. Sulfuric acid, causing acid swelling in the system, concentrates crystalline zinc sulfate to produce a large amount of waste acid by-product, and finally converts the waste acid into pure sulfuric acid through high-cost membrane separation. The treatment cost is high, and the concentration of purified dilute sulfuric acid is low, so it cannot be returned directly Ripening process, the actual industrial production is difficult to promote

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