A method for extracting Pb, In, Ag from indium-containing lead silver slag

Abstract

The invention discloses a method for extracting Pb, In and Ag from indium-containing lead silver residues. The method comprises the following steps of: Pb extracting, In extracting and Ag extracting. The method disclosed by the invention is used for sufficiently recycling resources by recycling valuable metal Pb, In and Ag from the indium-containing lead silver residues, has a very high economic value, and also avoids pollution of the lead silver residues on environment.

Description

technical field [0001] The invention relates to a method for extracting metal compounds by a wet method, in particular to a method for extracting Pb, In and Ag from lead-silver slag containing indium. Background technique [0002] Extracting valuable metals such as Zn, In, Pb, etc. from materials containing zinc, indium, lead, silver, etc. with low grades often needs to be reduced, oxidized, and roasted in a rotary kiln first, so that the valuable metals can be volatilized and enriched and combined with iron. , silicon, calcium and other elements are separated, most of the valuable metals Zn, In, Pb form oxides and enter the bag dust collection system, and then use neutral leaching-leaching solution to purify and remove impurities, then perform electrolytic separation to extract zinc, and use neutral leaching to make The indium in the slag is further enriched, and then carry out sulfuric acid leaching of In and neutral leaching of residual Zn. The acidic leaching solution is...

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Problems solved by technology

The traditional smelting method of lead and silver slag is pyrometallurgy. The blast furnace is used to reduce and smelt lead, and the silver is also reduced to a metal state and enters the crude lead to form a lead-silver alloy. Then the lead and silver are separated by electrolytic refining. This method can well Lead is extracted, but the recovery rate of silver is not high. Some silver and most of indium enter the slag and are difficult to recover, resulting in a waste of rare and precious metal resources. In addition, the fire method of lead smelting has great environmental pollution, high energy consumption, and the recovery rate of rare and precious metals. Secondly, most of the current production adopts the flotation method to treat the lead and silver slag, first separate and extract the silver, and then use the fire method to extract the lead. This method is ideal for the extraction of metallic lead and precious metal silver, but it is not suitable for the extraction of precious metals The lead-silver slag of indium, indium cannot be recovered well, which will cause waste of resources; there is also the use of pressure oxidation leaching, through which the sulfides such as ZnS and InS in the material can be oxidized and leached, Let the Zn and In in it be fully leached and recovered. The indium content in the leached slag is naturally low, and then the lead and silver are recovered through other methods of smelting lead and silver slag. This method is an ideal recovery method, which can make Zn and In one time However, the pressure oxidation leaching has the disadvantages of large equipment investment, high requirements for equipment and technical personnel, and it is difficult to implement and apply to small and medium-sized enterprises.

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