Smelting and separating method of noble lead

Abstract

The invention discloses a smelting and separating method of noble lead, comprising the following steps of: oxidizing and converting the noble lead till a silver-copper-bismuth alloy with the total content of lead and stibium, lower than 5 percent by weight, smoke dust B and oxidized slag are generated; dissolving the silver-copper-bismuth alloy with a nitric acid, and filtering to obtain filter liquor A and filter residues A; separating the silver by chloridizing the filter liquor A, and filtering to obtain filter liquor B and silver chloride; purifying the silver chloride to reduce the silver; displacing tellurium contained in the filter liquor B, then depositing bismuth and copper step by step, and recovering the bismuth and the copper; separating gold from the filter liquor A with an aqueous solution chlorination method, and reducing a solution to obtain gold powder; recovering platinum and palladium from the gold-separated solution, and returning gold-separated chlorination slag to an anode mud smelting process; and recovering the lead and the stibium from the oxidizing slag and the smoke dust B. In the invention, the silver-copper-bismuth alloy with the total content of the lead and the stibium lower than 5 percent by weight is produced through oxidization and converting, and the lead and the stibium enter the oxidized slag and the smoke dust B, therefore, not only are the conditions for the recovery of the lead and the stibium created, but also the valuable metal is basically concentrated in the silver-copper-bismuth alloy by reducing the valuable metal entering the smoke dust B and the oxidized slag; in addition, various metals are extracted from the silver-copper-bismuth alloy step by step by using a wet method, the direct recovery rate of the silver and the gold is higher than 99 percent, the direct recovery rate of selenium and the tellurium is higher than 80 percent, and the direct recovery rate of the platinum and the palladium is higher than 95 percent.

Description

Technical field: [0001] The invention relates to a precious metal smelting technology, in particular to a noble lead smelting and separation method. Background technique: [0002] There are currently three methods of silver smelting: fire method, wet method, and fire-wet combined process. Pyro-smelting is a relatively traditional method. Generally, crude silver is produced by pyro-smelting, and the oxidized slag is returned to the lead system for recycling. Hydrometallurgy uses acidification to dissolve various metals into the solution, and then separates silver and other metals. The fire-wet combined process method is also divided into two categories. One is that the fire method produces coarse silver and oxide slag, and the wet method is used to separate silver and other metals from the oxide slag. The other is to leaching copper, antimony, and bismuth by wet pretreatment first, then separating copper, antimony, and bismuth from the leaching solution, and leaching the sl...

AI Technical Summary

Problems solved by technology

[0005] The fire-wet combined process method is relatively advanced. The oxidation slag produced by silver separation is treated by wet method, and copper, bismuth, etc. are leached. The yield of silver and other precious metals is significantly improved. The silver recovery rate can reach more than 95wt%, but it cannot avoid The disadvantages of wet method, comprehensive recovery is difficult, nitrogen and sulfur waste gas and waste water are still the main problems of polluting the environment

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