Method for recovering tellurium in copper anode slime through normal-pressure closed oxygenation

Abstract

The invention provides a method for recovering tellurium in copper anode slime through normal-pressure closed oxygenation. The method comprises the following specific steps: adding a dilute sulphuric acid-dilute nitric acid mixed acid into copper anode slime for pulp blending, wherein the weight-volume ratio of copper anode slime in the blended pulp is controlled to be 15-25 g/mL, the dilute sulphuric acid content of the mixed acid is controlled to be 0.5-2 mol/L, and the dilute nitric acid content of the mixed acid is controlled to be 0.03-0.1 mol/L; placing the blended pulp in a closed container, introducing oxygen into the closed container for air removal, carrying out 0.5-1.5 hours' leaching under normal pressure, and then carrying out solid-liquid separation, wherein the leaching temperature is 100-115 DEG C, and the rotating speed of stirring is 300-500 r/min. The method provided by the invention has the advantages of being high in leaching rate, safe, reliable, and easy to handle; the tellurium leaching rate reaches 97.6-99.8%; moreover, the method is low in energy consumption and requirement for reaction equipment, the cost can be reduced, and the industrialized recovery of the element tellurium in copper anode slime is facilitated.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology, and in particular relates to a method for recovering tellurium in copper anode slime through airtight airflow at normal pressure. Background technique [0002] Tellurium is a rare element, mainly used in metallurgy and electronics industry. In terms of metallurgy, adding a small amount of tellurium to the alloy can improve the properties of the alloy. For example, adding about 0.04% tellurium to the steel can increase its cutting speed by three times without affecting its mechanical strength; adding 0.01% tellurium to the lead-based alloy %~0.5% tellurium can improve its corrosion resistance, hardness, and elasticity. In the electronics industry, tellurium is a good semiconductor material and can also be used in the production of solar cells. In addition, tellurium can also be used in chemical rubber industry, catalyst, glass industry, as well as photography, printing toner an...

AI Technical Summary

Problems solved by technology

The traditional sulfuration roasting method produces a large amount of harmful gas during operation, which has the disadvantages of large pollution and high energy consumption, and the recovery rate of tellurium is not high, and the valuable metals tend to disperse; the oxygen pressure leaching method is divided into acid leaching and alkali leaching Two, the sulfuric acid concentration used in the acid leaching process is as high as 93%, which has the defects of high acid consumption and harsh leaching conditions; while the alkali leaching process has the defects of excessive oxygen and alkali consumption

In addition, the oxygen pressure immersion method also has disadvantages such as high energy consumption, dangerous operation, and high requirements for equipment and materials.