Method for comprehensively recovering valuable metal from copper tellurium slag

Abstract

The invention discloses a method for comprehensively recovering valuable metal from copper tellurium slag. The copper tellurium slag is dissolved by using nitric acid, so that silver, copper and bismuth in the copper tellurium slag are basically dissolved in a solution; tellurium is oxidized into tellurium oxide, thereby entering undissolved slag. Silver, copper and bismuth are separated and recovered via fractional precipitation of the solution; and tellurium is separated and recovered via alkaline leaching of the undissolved slag. The method solves the problems that cost of a conventional process is high, copper recovery rate and tellurium recovery rate are not high, and that silver and bismuth cannot be recovered in the conventional process; influences on the environment of the production process are reduced; a whole process is simple; and pollutions toward the environment is small. The method is simple in the whole production process, low in cost and small pollutions toward the environment, has high comprehensive recovery rate, and realizes complete separation of silver, copper, bismuth and tellurium. The obtained products have high purity; and the recovery rate of silver, copper, bismuth and tellurium is higher than 99%.

Description

Technical field: [0001] The invention relates to a copper-tellurium slag recovery method, in particular to a method for comprehensively recovering valuable metals from copper-tellurium slag. Background technique: [0002] At present, in the copper leaching process of the wet treatment anode mud, 25-50% of the tellurium in the anode mud enters the copper separation solution. This part of the tellurium is mainly replaced by copper powder to produce copper tellurium slag for recovery. The main component of copper tellurium slag is copper telluride, in addition to copper, bismuth, silver and other metals. There are two main methods for the comprehensive recovery of traditional copper tellurium slag: [0003] Method 1: Copper-tellurium residue is leached copper with sulfuric acid and oxidant, and then alkaline leaching is used to separate tellurium. Its disadvantages are: low leaching rate of copper and tellurium; a large amount of expensive oxidants are required; silver and bismuth i...

AI Technical Summary

Problems solved by technology

The disadvantages are: low leaching rate of copper and tellurium; a large amount of expensive oxidant is required; silver and bismuth in raw materials cannot be separated and recovered; the production process is complicated

Its disadvantages are: raw materials need to be mixed with a large amount of concentrated sulfuric acid for roasting, and the sintered agglomerates after roasting need to be ball milled, resulting in serious corrosion of production equipment and poor production environment; complex production process and high pressure on environmental protection; silver and bismuth in raw materials cannot be obtained Separation and recovery