Method for leaching tellurium from copper anode mud using pressurized acid leaching process

Abstract

The present invention relates to pressurizing and acid leaching process for leaching out tellurium from copper anode mud, and belongs to the field of wet metallurgical technology of rare dispersion element. The process includes the following steps: mixing water and anode mud in 1-40 wt% to prepare slurry, filtering to eliminate large grain and sand, mixing with sulfuric acid solution of 70-300 g / L concentration, heating in a high pressure reactor at 100-180 deg.c, introducing gaseous oxidizing medium, regulating and maintaining the pressure at 0.5-1.6 MPa for direct acid leaching reaction for 60-120 min, solid-liquid separation to obtain the tellurium leachate. The present invention has simple technological process, less needed apparatus, reinforced process, short leaching period and high tellurium leaching rate.

Description

technical field [0001] The invention relates to a method for leaching tellurium from copper anode slime, which belongs to the technical field of wet extraction metallurgy of scattered elements. Background technique [0002] Scattered element tellurium is an alloy additive widely used in iron and steel and nonferrous metallurgy; a catalyst in chemical industries such as petroleum and rubber, and an important raw material for semiconductors and infrared optical devices. Because of its important position in the fields of modern high-tech industry, national defense and cutting-edge technology, tellurium has been paid more and more attention by people, and its application range has become wider and wider. Most of the world's recoverable tellurium is associated with copper deposits and telluride-type gold-silver deposits. [0003] The industrially produced tellurium element mainly comes from the anode slime in the copper electrolytic refining process. Due to the high price of te...

AI Technical Summary

Problems solved by technology

There are three ways to produce tellurium from tellurium dioxide. The first method is direct reduction with charcoal powder or flour; this method is simple and low in cost, but the loss of tellurium in the reduction process is large and the working conditions are not good

The second method is to dissolve tellurium dioxide in sulfuric acid and reduce it with sulfur dioxide; the tellurium recovered by this method is in the form of a sponge and has limited uses

Moreover, the anode slime is repeatedly carried out in alkaline and acidic environments during the treatment process, resulting in ineffective consumption of auxiliary materials; or causing the precious metals and other valuable metals in the anode slime to be converted into compounds that are difficult to process and extract, making the subsequent recovery of precious metals more difficult. difficult, affecting the recovery rate of precious metals; in addition, when the roasting process is used, the flue gas contains a large amount of SO2 gas, which increases the difficulty of flue gas treatment and easily causes environmental pollution; The process operation (low temperature process) is carried out alternately several times, which greatly increases the energy consumption of the process, and the energy utilization is unreasonable

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