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Comprehensive recovery method for arsenic and antimony smoke dust

A recovery method and smoke dust technology, applied in the direction of instrumentation, optics, process efficiency improvement, etc., can solve the problems of inability to completely separate arsenic and antimony, unfavorable industrialization promotion, and high cost of chemicals, so as to save the cost of chemicals, reduce processing costs, reduce The effect of processing costs

Pending Publication Date: 2022-01-14
HUNAN RES INST FOR NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the oxidation-alkali leaching method cannot leach the arsenate in the soot, it cannot completely separate arsenic and antimony; at the same time, it needs to consume 0.2-1 ton of hydrogen peroxide and 1-4 tons of caustic soda to treat one ton of arsenic and antimony soot, and the cost of chemicals is very high. Conducive to the promotion of industrialization

Method used

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  • Comprehensive recovery method for arsenic and antimony smoke dust

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Effect test

Embodiment 1

[0038] A kind of processing method of arsenic antimony smoke dust of the present invention, its process flow schematic diagram is as figure 1 As shown, the object of processing is the arsenic-antimony smoke dust (the mass content of As is 12.7%, and the mass content of Sb is 44.26%) produced by a gold and silver workshop of a lead smelter, including the following steps:

[0039] (1) Add arsenic and antimony fumes to the sodium carbonate solution, heat up to 100° C., carry out a stage of oxidation leaching for 2 hours under air stirring conditions, the pH value at the end of the reaction is 8, and obtain filtrate A and filter residue A after filtration;

[0040] (2) Add filter residue A to 20% sodium carbonate solution, heat up to 95°C, carry out two-stage oxidation leaching for 3 hours under air stirring and microwave radiation conditions, the frequency of microwave is 2450MHz, and obtain filtrate B and filter residue B after filtration ; The content of arsenic and antimony in...

Embodiment 2

[0044] A method for processing arsenic-antimony fumes of the present invention, the object of treatment is the arsenic-antimony fumes (the mass content of As is 24.15%, and the mass content of Sb is 49.78%) produced by a Xigui workshop of a lead smelter, comprising the following steps:

[0045] (1) Add arsenic and antimony fumes to the sodium carbonate solution, heat up to 100° C., carry out a stage of oxidation leaching for 2 hours under air stirring conditions, the pH value at the end of the reaction is 9, and obtain filtrate A and filter residue A after filtration;

[0046] (2) Add filter residue A to 20% sodium carbonate solution, heat up to 95°C, carry out two-stage oxidation leaching for 3 hours under air stirring and microwave radiation conditions, the frequency of microwave is 2450MHz, and obtain filtrate B and filter residue B after filtration ; The content of arsenic and antimony in the filter residue B is detected, the mass content of As is 3.94%, and the mass conten...

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Abstract

The invention discloses a comprehensive recovery method for arsenic and antimony smoke dust. The method comprises the following steps that (1) the arsenic and antimony smoke dust is added into a leaching solution to conduct first-stage oxidation leaching, and filtering is conducted after the leaching is completed, so as to obtain a filtrate A and filter residues A; (2) the filter residues A are added into a leaching solution to conduct second-stage oxidation leaching, and filtering is conducted after the leaching is completed, so as to obtain a filtrate B and filter residues B; (3) the filtrate A is electrolyzed to obtain electrolytic arsenic and electrolytic waste liquid; and (4) the filter residues B are roasted at a high temperature to obtain low-arsenic high-antimony cinder. According to the method, the arsenic and antimony smoke dust is comprehensively recovered and treated, a removal rate of arsenic in the arsenic and antimony smoke dust can reach 98% or above, a total residual arsenic content of smoke dust obtained after arsenic removal is lower than 0.5%, a separation effect is desirable, a requirement for raw materials entering a furnace for antimony smelting is met, an arsenic-containing filtrate obtained in a recovery process can be used for electrolyzing to produce electrolytic arsenic, and CO2 generated by leaching is blown into the electrolytic waste liquid to regenerate sodium carbonate, so that zero medicament cost and zero discharge of wastewater are realized.

Description

technical field [0001] The invention belongs to the technical field of hazardous solid waste treatment, and in particular relates to a comprehensive recovery method for arsenic, antimony, smoke and dust. Background technique [0002] During the pyro-smelting process of lead anode slime, high arsenic and antimony smoke dust is produced, and the arsenic in it is mainly As 2 o 3 The form of arsenic and antimony enters the flue and is enriched in the flue dust. Since arsenic and antimony are elements of the same main group, their physical and chemical properties are relatively similar, and their boiling points are lower. Smoke and dust with high antimony content, the general arsenic content is about 20%-40%, and the antimony content is about 20%-50%. In a general large-scale smelter, the annual output of high-arsenic and antimony fume is more than 800 tons. Arsenic is harmful to the human body and the environment, and antimony is a valuable metal, so this kind of smoke needs ...

Claims

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Application Information

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IPC IPC(8): C22B30/02C22B7/02C22B30/04C22B1/11C25C1/22
CPCC22B30/02C22B7/02C22B7/008C22B30/04C22B1/11C25C1/22Y02P10/20
Inventor 陈伟曹柏林
Owner HUNAN RES INST FOR NONFERROUS METALS
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