Method for extracting high-purity tellurium oxides from copper anode mud

Abstract

The invention discloses a method for extracting high-purity tellurium oxides from copper anode mud. The method comprises the steps as follows: firstly, sulfuric acid is added in the copper anode mud at first, sodium chlorate is then added in the copper anode mud, the mixture is heated, silver and lead are precipitated in residues and are separated out, and gold, copper, bismuth, tellurium and selenium enter leach liquor; secondly, common salt is added in leach liquor that is processed in the first step, the mixture is mixed and resolved, then gaseous SO2 is pumped in mixed liquor for 1 hour, and gold, tellurium and selenium are reduced and deposited and then are processed through pressure filtration; thirdly, in step A, sulfuric acid is added in deposited residues of the gold, tellurium and selenium, then catalytic agents are added in the mixture, then sodium chlorate is added in the mixture until the color of the deposited residues is transformed into the color of tellurium oxides, and pressure filtration is carried out; in step B, sodium hydroxide is added in the deposited residues that are processed in the step A, the mixture is processed through pressure filtration, and then sodium tellurite and sodium selenite solution are obtained; and fourthly, sulfuric acid is added in sodium tellurite and sodium selenite solution which are obtained in the third step, sodium selenite remains in liquid, and tellurium dioxide is precipitated and separated out.

Description

technical field [0001] The invention relates to a method for extracting tellurium oxide, in particular to a method for extracting high-purity tellurium oxide from copper anode slime. Background technique [0002] Copper anode slime contains more valuable elements, including precious metals gold, silver, platinum, palladium, scattered metals selenium and tellurium, non-ferrous metals copper, lead, bismuth, etc. Extracting tellurium oxide from copper anode slime is the key to obtaining metal tellurium important way. In the existing separation methods, the combined process of partial fire furnace and wet leaching is generally used. For example, after the rotary kiln is roasted to extract selenium, the roasted slag is leached to separate copper, tellurium and lead, and then separate gold and silver. The process is relatively complicated. , and part of the tellurium will disperse when the copper is leached, and the lead will be leached together when the tellurium is separated. I...

AI Technical Summary

Problems solved by technology

In the existing separation methods, the combined process of partial fire furnace and wet leaching is generally used. For example, after the rotary kiln is roasted to extract selenium, the roasted slag is leached to separate copper, tellurium and lead, and then separate gold and silver. The process is relatively complicated. , and part of the tellurium will disperse when the copper is leached, and the lead will be leached together when the tellurium is separated. If the lead is not recovered intensively, the recovery and impurity removal load of the tellurium will be increased. The recovery rate is not high, and the grade of the tellurium oxide is low.