Arsenic-containing anode mud treatment method

By using carbon powder and metallic Bi reducing agent to reduce arsenic-containing anode mud at low temperatures, and combining it with vacuum distillation and staged condensation technology, the problem of arsenic oxide volatilization was solved, and efficient and environmentally friendly recycling of metals from anode mud was achieved.

CN121518801APending Publication Date: 2026-02-13KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202511540728.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-27
Publication Date
2026-02-13

AI Technical Summary

Technical Problem

In existing technologies, arsenic enters the flue dust in the form of As2O3 during the treatment of lead and copper anode sludge, which has no effective treatment, leading to environmental pollution and health threats, and the separation process is complex.

Method used

A mixture of carbon powder and metallic Bi was used as a reducing agent for solid arsenic smelting. Arsenic-containing anode mud was reduced at 400℃~500℃. Subsequently, elemental arsenic, lead-antimony-bismuth alloy, silver-copper-gold alloy and other metals were extracted by vacuum distillation and staged condensation separation. The low melting point and reducing properties of Bi were used for synergistic reduction and capture.

Benefits of technology

This method enables the effective reduction of arsenic oxides to elemental arsenic at low temperatures, avoiding arsenic volatilization, simplifying the separation process, and improving metal recovery rate and environmental friendliness.

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Abstract

The invention provides an arsenic-containing anode slime treatment method which can comprise the following steps: drying arsenic-containing anode slime, and screening to obtain anode slime powder; and the anode slime powder and a reduction arsenic fixing smelting agent are mixed, reduction smelting is carried out in the inert atmosphere at the temperature of 400-500 DEG C till the reaction is finished, cooling is carried out to the room temperature, a product containing elemental arsenic is obtained, and the reduction arsenic fixing smelting agent is a mixture of carbon powder and metal Bi. According to the method, reduction smelting of solid arsenic can be achieved at low temperature, it is avoided that arsenic enters smoke in the form of arsenic oxide in a traditional method, and arsenic harm is avoided.
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