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Method for separating tellurium from precious metals

A precious metal and material technology, applied in the field of separation of selenium, tellurium and precious metals, can solve the problems of large processing capacity, large amount of slag returned, long production cycle, etc., and achieve the effect of simple process, high leaching rate and complete separation

Inactive Publication Date: 2013-11-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method has strong adaptability to raw materials and large processing capacity. The precious metal alloy formed is not conducive to the separation and recovery of gold, platinum and palladium. The direct metal recovery rate is not high, the loss of tellurium and selenium is large, and the production cycle is long.
The latter two methods cannot effectively and thoroughly separate tellurium from precious metals at one time, and have many disadvantages such as long production cycle, more slag returning, and low direct recovery rate of precious metals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Clean the precious metal material containing tellurium and selenium (the composition percentage range of the precious metal material containing tellurium and selenium: precious metal 50wt%, tellurium 20wt%, selenium 18wt%), and mix the water-containing material with sodium carbonate and sodium chlorate evenly Mix (the mass ratio of the noble metal material containing tellurium and selenium to sodium carbonate and sodium chlorate is 10:12:3, and the purity of sodium carbonate and sodium chloride is commercially available industrial grade), aging for 12 hours, and the mixed material Naturally air-dry; then oxidize the noble metal materials containing tellurium and selenium in a low-temperature environment of 250°C with sufficient air for 2 hours, and keep stirring during the oxidation process;

[0023] (2) Within 8 hours, leaching the oxidized roasting conversion material obtained in step (1) in NaOH alkali aqueous solution with a concentration of 10g / L, stirring conti...

Embodiment 2

[0025] (1) Clean the noble metal material containing tellurium and selenium (the composition percentage range of the noble metal material containing tellurium and selenium: 80wt% noble metal, 25wt% tellurium, 1.0wt% selenium), and mix the aqueous material with sodium carbonate and sodium chlorate Mix evenly (the mass ratio of precious metal materials containing tellurium and selenium to sodium carbonate and sodium chlorate is 10:8:0.1, and the purity of sodium carbonate and sodium chloride is commercially available industrial grade), age for 18 hours, and wait to mix Naturally air-dry the material; then oxidize the noble metal material containing tellurium and selenium in a low temperature environment of 300°C with sufficient air for 1.5 hours, and keep stirring during the oxidation process;

[0026] (2) Within 1 hour, leaching the oxidized roasting conversion material obtained in step (1) in NaOH alkali aqueous solution with a concentration of 10g / L, stirring continuously duri...

Embodiment 3

[0028] (1) Clean the precious metal material containing tellurium and selenium (the composition percentage range of the precious metal material containing tellurium and selenium: 95wt% precious metal, 1.0wt% tellurium, 25wt% selenium), and mix the aqueous material with sodium carbonate and sodium chlorate Mix evenly (the mass ratio of the precious metal material containing tellurium and selenium to sodium carbonate and sodium chlorate is 10: 5:2, and the purity of sodium carbonate and sodium chloride is commercially available industrial grade), aging for more than 22 hours, and wait for The mixture is air-dried naturally; then oxidize the noble metal materials containing tellurium and selenium in a low temperature environment of 500 ° C with sufficient air for 2.5 hours, and keep stirring during the oxidation process;

[0029] (2) Within 2 hours, leaching the oxidized roasting conversion material obtained in step (1) in NaOH alkali aqueous solution with a concentration of 10g / L...

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Abstract

The invention relates to a method for separating tellurium from precious metals, belonging to the field of rare non-ferrous metal metallurgy and precious metal metallurgy. In the invention, a low temperature oxidization-alkaline water leaching method is adopted, the flow is simple, the selenium and tellurium leaching rate is high, the precious metals are not oxidized and all kept in solid phase, the precious metal slag rate is greater than 99.99% and the selenium and tellurium leaching rate is greater than 96.00%, so that the thorough separation of selenium and tellurium from precious metals in precious metal materials containing certain selenium and tellurium is realized.

Description

technical field [0001] The invention relates to a method for separating selenium, tellurium and precious metals, belonging to the fields of rare ferrous metal metallurgy and precious metal metallurgy. Background technique [0002] This kind of precious metal material comes from the treatment process of various metal electrolytic anode slimes, such as tellurium-containing precious metal materials produced when copper anode slime undergoes copper separation, precious metal recovery, and enrichment treatment. During copper electrolysis, base metals with negative potential dissolve into the solution, and noble metals, scattered metals (such as selenium and tellurium), anode powder, etc. form insoluble matter, which is anode slime. Such precious metal materials containing tellurium and selenium are also produced during the process of extracting precious metals from copper anode mud. [0003] The yield of copper anode slime is generally 0.2 to 1%, and generally up to 1.4%. In th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B1/02C22B3/12C01B19/02
CPCY02P10/20
Inventor 朱云陈雯刘中华
Owner KUNMING UNIV OF SCI & TECH