Efficient Separation and Recovery Method of Arsenic, Antimony and Bismuth from High Antimony and Lead Anode Sludge

CN122128528APending Publication Date: 2026-06-02GUANGXI NANGUO COPPER IND CO LTD +1

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: GUANGXI NANGUO COPPER IND CO LTD
Filing Date: 2026-03-12
Publication Date: 2026-06-02

AI Technical Summary

Technical Problem

Existing technologies for treating high-antimony-lead anode mud are characterized by high energy consumption, low separation efficiency, and severe pollution. Pyrometallurgical processes are energy-intensive and cause severe environmental pollution, while wet processes are inefficient and costly.

Method used

A combined alkaline leaching and gradient temperature control method was adopted to simultaneously leach arsenic, antimony, and bismuth using a sodium hydroxide-glycerol composite leachate at low alkaline concentrations. Selective separation was achieved by combining segmented pH adjustment and gradient temperature control, and high-purity products were prepared through reduction, oxidation, and electrolysis processes.

Benefits of technology

It achieves low-energy consumption and high-selectivity simultaneous separation and recovery of arsenic, antimony, and bismuth, with product purity exceeding 99.96%, a 50% reduction in process time, lower reagent costs, and environmental friendliness.

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Abstract

This invention provides an efficient method for separating and recovering arsenic, antimony, and bismuth from high-antimony-lead anode mud, comprising the following steps: Step A: ball milling the high-antimony-lead anode mud to 200-400 mesh to obtain fine-grained raw material; Step B: preparing a sodium hydroxide-glycerol composite leachate, wherein the sodium hydroxide concentration is controlled at 1-2 mol / L and the glycerol concentration at 200-250 g / L, and adding the fine-grained raw material obtained in Step A to the leachate at a liquid-to-solid ratio of 5:1; Step C: slowly adding dilute sulfuric acid to the leachate to adjust the pH value to 4.0-5.0, precipitating bismuth precipitate. By slowly adding dilute sulfuric acid to the leachate to adjust the pH to 4.0-5.0, bismuth precipitates. After filtration, the pH is further adjusted to 2.0-3.0, antimony precipitates. After filtration again, the pH is adjusted to 0.5-1.5, arsenic precipitates. This process achieves efficient separation of arsenic, antimony, and bismuth. Combined with gradient temperature reduction and electrolytic refining processes, the product purity is increased to over 99.96% for arsenic, 99.5% for antimony, and 99.6% for bismuth, meeting the requirements for industrial-grade high-purity products.

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