Method for selectively removing arsenic and recycling valuable metals from white smoke dust

Abstract

The invention discloses a method for selectively removing arsenic and recycling valuable metals from white smoke dust. The method comprises the following steps: mixing and acidifying arsenic-containing white smoke dust generated by copper smelting, sulfuric acid and an additive in a ratio of white smoke dust to sulfuric acid to the additive being 1 to (0.1-1) to (0.01-0.5); roasting the mixed acidified materials for 1-6 hours at a temperature of 250-600 DEG C, violating and introducing arsenic in the white smoke dust into smoke dust in the form of arsenic trioxide, roasting and transforming valuable metals into sulfate or metal oxides or sulfide for slagging, and realizing separation of arsenic and valuable metals, thereby accomplishing arsenic removal; adding water into roasted slag for leaching in a solid-to-liquid ratio being 1 to (2-7), controlling the pH value of leach liquor to be smaller than or equal to 7 at a leaching temperature being 80-95 DEG C, stirring and leaching for 2-4 hours, and filtering; and recycling copper and zinc from filtrate, and recycling other metals from filter slags. The method disclosed by the invention is good in universality, is wide in raw material adaption, is good in value metal and arsenic separation effect, and is simple in value metal recycling process.

Description

technical field

[0001] The invention relates to the technical field of resource utilization methods for white smoke and dust in the copper smelting industry. Background technique

[0002] The white fumes produced in copper smelting production contain more valuable metals. Different raw materials and smelting processes result in large differences in the composition of white fumes such as arsenic, copper, tin, and lead. The current treatment methods for these arsenic-containing hazardous waste materials There are mainly harmless, resourceful and source reduction treatment.

[0003] The existing white soot resource treatment processes mainly include wet method, fire method, and fire-wet (wet-fire) method combined process. There is no perfect treatment process. For example, the water leaching arsenic removal process (a method for pre-removing arsenic from arsenic-containing soot disclosed in Chinese patent CN201610998354.9), uses one-stage hot water leaching and two-stage alka...

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