Treatment process for arsenic sulfide containing material

Abstract

The invention discloses a treatment process for an arsenic sulfide containing material. The treatment process for the arsenic sulfide containing material comprises three main steps: pulpifying of theraw material, oxygen pressure acid leaching, and reducing and separating. The liquid-solid mass ratio is 3:1 to 10:1 in the pulpifying of the raw material, the pulpifying lasts for 2-4 hours at the temperature of 80-100 DEG C; the oxygen pressure acid leaching lasts for 2-4 hours at the temperature of 90-180 DEG C at the pressure of 0.1-3 MPa at the speed of 100-3000 r / min; an arsenic containing leaching agent is reduced and separated through sulfur dioxide, sodium thiosulfate or sulfite, and is then secondarily pulpified and separated to obtain a sulfite product. The arsenic content in a leaching residue is less than 5%, the recovery rate of arsenic is more than 80%; a surfactant is added in the pulpifying process, so that the oxidation reaction is more thorough; a vacuum pulpifying tankprovided with an exhaust system is used to prevent the waste gas from overflowing, and is beneficial for improving the operation environment. The technological process is short, and the treatment process has the advantages of environmental protection, economical efficiency, energy saving, and efficient utilization of resources, etc.

Description

technical field [0001] The invention relates to a treatment process for materials containing arsenic sulfide, specifically belonging to the technical field of metallurgy. Background technique [0002] Arsenic is a highly toxic and carcinogenic element, enriched in copper, lead, zinc, nickel, cobalt, gold and silver and other non-ferrous metal ores. During the smelting process, arsenic mainly enters the flue gas and dust in the form of oxides. In the washing process, the arsenic is discharged along with the waste acid. Smelters generally use sulfuration process to treat waste acid, so that arsenic will eventually enter the arsenic-containing filter cake. [0003] At present, there are mainly two methods for processing arsenic-containing filter cakes, one is fire separation, and the other is wet separation. Fire production mainly uses the roasting method. The arsenic trioxide produced by oxidation and roasting of arsenic sulfide directly volatilizes into the flue gas, and is...

AI Technical Summary

Problems solved by technology

The reduction effect of this method is poor. Trivalent arsenic needs to be crystallized by cooling down, which consumes a lot of energy. The sulfur element generated during the reaction will also cover the surface of the reactant, resulting in incomplete reaction.

[0007] To sum up, there are many research papers and related patent reports on the wet treatment of arsenic sulfide-containing materials, but the existing technology still has the problems of incomplete reaction, high equipment material requirements, and high energy consumption.

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