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Method for extracting gold and silver from anode mud through wet process

A technology of anode slime and wet method, applied in the field of hydrometallurgy, can solve the problems of unfriendly environment and deteriorating workshop environment, and achieve the effects of simplified process flow, efficient separation and reduced energy consumption

Active Publication Date: 2018-05-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0007] However, these wet treatment processes all use ammonia immersion or sodium sulfite to separate silver, and water chlorine method to extract gold from silver separation residue. The process of silver separation and gold separation volatilizes ammonia and chlorine respectively, which seriously deteriorates the workshop environment and is environmentally unfriendly. method

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  • Method for extracting gold and silver from anode mud through wet process
  • Method for extracting gold and silver from anode mud through wet process

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Embodiment

[0058] The content of some elements in the anode slime in a certain place is shown in Table 1:

[0059] Table 1. Partial element content of anode slime in a certain place (%, Au, Ag unit g / t)

[0060]

[0061] (1) Pretreatment: Take 5g of anode slime, add it to 25% dilute sulfuric acid, prepare it into a slurry according to the liquid-solid ratio of 3:1, and add 2gMnO at a mass fraction of 15% 2 , the stirring speed was set to 400rpm, the temperature was 80°C, and the leaching time was 12h. After the pretreatment, the solid-liquid separation is carried out to obtain filtrate and filter residue containing copper and manganese ions. Because part of the silver dissolves, in order to recover this part of silver, add 0.16g of sodium chloride 1.2 times the theoretical amount, and stir at room temperature for 30 minutes. . The silver chloride filter residue enters the silver separation process, and 1.13g of zinc powder, which is 1.2 times the theoretical amount, is added to the...

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Abstract

The invention relates to a method for extracting gold and silver from anode mud through a wet process. The method includes the following steps that (1) pretreatment is carried out, wherein pretreatment is carried out to remove acid soluble metal from the anode mud, the gold and silver are enriched, and meanwhile, the silver is converted to be in the form easy to lixiviate; (2) a silver separatingprocess is carried out, wherein the silver is extracted from lixiviating slag obtained through pretreatment by using an efficient silver separating agent, namely thiosulfate, and an appropriate amountof zinc powder is added into silver separating liquid after liquid solid separation to restore a complex of silver thiosulphate into silver elementary substance; and (3) a gold separating process iscarried out, wherein alkaline medium thiosulfate-a novel oxidizing agent system are adopted for separating gold to achieve efficient gold lixiviating, an appropriate amount of zinc powder is added into the silver separating liquid to restore the gold thiosulphate complex into gold powder. According to the method, the gold and silver in the anode mud can be sufficiently recovered, the gold and silver direct recovery rates are 96.82% and 99%, the process is environment-friendly and efficient, and no poisonous and harmful gas is generated.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for extracting gold and silver from anode mud by a wet method. Background technique [0002] Anode slime is a by-product of the metal smelting process. Some impurities contained in the anode metal plate fall off from the anode plate during the electrolysis process and deposit on the bottom of the electrolytic cell, commonly known as anode slime. The components in anode slime include rare and precious metals such as gold, silver, platinum, and palladium, which have extremely high recycling value. [0003] At present, the comprehensive utilization process of anode slime at home and abroad is mainly divided into three categories: pyrometallurgy process, combined process of dressing and smelting, and hydrometallurgy process. [0004] Pyrometallurgy process-this process is the earliest developed conventional anode slime treatment process, including the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00
CPCC22B7/008C22B11/042C22B15/0091Y02P10/20
Inventor 陈运法肖力王永良付国燕钱鹏叶树峰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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