Method for separating and enriching valuable metals from copper anode mud

Abstract

The invention discloses a method for separating and enriching valuable metals from copper anode mud. The method comprises the following steps that (1) the copper anode mud and a smelting agent are mixed evenly and are smelted at the temperature of 350-700 DEG C, and a smelting product is obtained; (2) the smelting product is crushed and immersed in water, alkaline leaching residues and alkaline leaching liquid are obtained, and selenium and arsenic are recycled from the alkaline leaching liquid; (3) acid and sodium chloride are added into the alkaline leaching residues, ozone is introduced in the alkaline leaching residues for ozone strengthening acid leaching, and acid leaching residues and acid leaching liquid are obtained; and copper and tellurium are recycled from the acid leaching liquid, and lead, stibium and precious metals are recycled from the acid leaching residues. According to the process, the method has the advantages that the selenium and arsenic removal rate is high; the moving directions of the valuable metals are more reasonable and concentrated; the enrichment ratio of the precious metals is high; the direct recovery rate of all elements is high; the comprehensive recovery benefits are good; the problem that tellurium and arsenic in the copper anode mud are dispersed seriously in a traditional process is solved; operation is safe; the labor intensity is low; the treatment time is short; and the operation environment is good.

Description

technical field [0001] The invention relates to a method for recovering valuable metals, in particular to a method for separating and enriching valuable metals from copper anode slime. Background technique [0002] Copper anode slime is an important by-product produced in the process of blister copper electrolytic refining, which mainly contains gold, silver, copper, lead, selenium, tellurium, arsenic, antimony, nickel, bismuth, tin and platinum group metals, and is used to extract rare and precious metals main raw material. [0003] In order to extract rare and precious metals in copper anode slime, it is necessary to pretreat copper anode slime before extracting precious metals to remove impurity metals that have a great influence on the extraction process of precious metals, and then extract gold and silver by fire or wet methods. There are many studies on the pretreatment methods of copper anode slime, mainly including air oxidation decopper method, oxidation roasting m...

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Problems solved by technology

[0004] The sulfuration roasting method is to mix copper anode slime with concentrated sulfuric acid and then roast in a rotary kiln to oxidize selenium into volatile SeO 2 And recover in the form of crude selenium, copper is converted into soluble copper sulfate, and then the copper is dissolved with dilute acid; Long, serious environmental pollution, prominent arsenic dispersion problem

The pressurized oxidative acid leaching method uses high temperature and high pressure in the sulfuric acid system to strengthen the decopper reaction process. The leaching rate of copper in this method reaches more than 98%, accompanied by the dissolution of a small amount of silver, selenium, tellurium, arsenic and other metals; The advantages of this method are high copper removal rate and short process, but there are disadvantages such as easy corrosion of equipment, low removal rate of selenium and tellurium, and prominent arsenic dispersion problem.

The alkaline pressure oxidation leaching method is to carry out pressure oxidation leaching of selenium and arsenic in copper anode slime in an alkaline sodium hydroxide system. This method has a high removal rate of selenium and arsenic and a short process, but the equipment is prone to corrosion, Disadvantages such as complicated operation and low tellurium recovery rate

The beneficiation and enrichment method is that the copper anode slime is oxidized and decoppered by air and then flotation treatment, so that most of the base metals such as lead and antimony are separated from the precious metals, and gold, silver, selenium, tellurium and platinum group metals are enriched in the silver concentrate In the process, the obtained silver concentrate contains more than 50% silver. This method is often combined with the copper anode mud fire treatment process and is called the combined process of dressing and smelting. Before the reduction smelting, the roasting method is used to volatilize selenium with selenium dioxide. ; This method has the advantages of high precious metal enrichment ratio, short process and low cost, but its disadvantages such as large amount of waste water and poor comprehensive recovery effect limit the promotion of this method

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