Method for recovering tellurium from high-tellurium residues

A technology of slag and tellurium slag, applied in the field of non-ferrous metal hydrometallurgy, can solve the problems of difficult oxidation of tellurium metal, unqualified tellurium products, incomplete removal of impurities, etc., and achieve low production cost, no environmental pollution, and significant economic benefits Effect

Active Publication Date: 2017-02-08
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process is feasible in principle, but tellurium metal is difficult to be oxidized. This process has problems such as slow reaction speed, long cycle and incomplete removal of impurities, which may easily lead to unqualified tellurium products.

Method used

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  • Method for recovering tellurium from high-tellurium residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The flow chart of the method for recovering tellurium from high tellurium slag material in this embodiment is as follows figure 1 As shown, the specific steps are as follows:

[0033] Crush 5000g of high tellurium slag material (Te 73.18%, 3659g; Pb 0.64%, 32g; Ag 0.055%, 2.75g) to a particle size ≤ 10mm, slowly add 16L of hydrochloric acid and hydrogen peroxide mixed solution prepared in advance into the reaction tank and keep stirring , carry out oxidative leaching; wherein, in the oxidative leaching stage, hydrochloric acid is concentrated hydrochloric acid for industrial use, hydrogen peroxide is industrial hydrogen peroxide with a content of 20% to 40%, the mass ratio of hydrochloric acid to high tellurium slag material is 1.1:1, hydrogen peroxide and high tellurium slag The mass ratio of the material is 1.5:1; the temperature is controlled at 70-80°C, and the liquid-solid separation is carried out after the high-tellurium slag material is completely dissolved to o...

Embodiment 2

[0035] The flow chart of the method for recovering tellurium from high tellurium slag material in this embodiment is as follows figure 1 As shown, the specific steps are as follows:

[0036]5000g of high tellurium slag material (Te 71.08%, 3554g; Pb 0.79%, 39.5g; Ag 0.062%, 3.1g) was crushed to a particle size ≤ 10mm, and 12L of hydrochloric acid and hydrogen peroxide mixed solution prepared in advance was slowly added to the reaction tank and continuously Stir and carry out oxidation leaching; wherein, in the oxidation leaching stage, hydrochloric acid is industrial concentrated hydrochloric acid, hydrogen peroxide is industrial hydrogen peroxide with a content of 20-40%, the mass ratio of hydrochloric acid to high tellurium slag material is 2.5:1, hydrogen peroxide and high tellurium slag The mass ratio of the slag is 3:1; the temperature is controlled at 70-80°C, and the liquid-solid separation is carried out after the high-tellurium slag is completely dissolved to obtain t...

Embodiment 3

[0038] The flow chart of the method for recovering tellurium from high tellurium slag material in this embodiment is as follows figure 1 As shown, the specific steps are as follows:

[0039] Break 5000g of high tellurium slag material (Te 70.01%, 3501g; Pb 0.85%, 42.5g; Ag 0.071%, 3.55g) to particle size ≤ 10mm, slowly add 14L of hydrochloric acid and hydrogen peroxide mixed solution prepared in advance into the reaction tank and continuously Stir and carry out oxidation leaching; wherein, in the oxidation leaching stage, hydrochloric acid is concentrated hydrochloric acid for industrial use, hydrogen peroxide is industrial hydrogen peroxide with a content of 20% to 40%, the mass ratio of hydrochloric acid to high tellurium slag material is 2.0:1, hydrogen peroxide and high tellurium slag The mass ratio of the slag is 2.5:1; the temperature is controlled at 50-70°C, and the liquid-solid separation is carried out after the high-tellurium slag is completely dissolved to obtain t...

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Abstract

The invention discloses a method for recovering tellurium from high-tellurium residues in an efficient and environment-friendly mode. The method includes the steps of breaking the high-tellurium residues, slowly adding hydrochloric acid and hydrogen peroxide into the high-tellurium residues, controlling the temperature and continuously stirring to carry out oxidizing leaching; carrying out liquid-solid separation after the residues are completely dissolved, wherein tellurium oxide as the major element enters leaching solutions, valuable metal such as Pb and Ag enters leaching residues in the mode of chloride salt, and lead and silver residues return to a lead smelting system to recover the valuable metal; and adjusting the pH value of the tellurium-containing leaching solutions to be 5.0-6.0 through sodium hydroxide solutions, obtaining TeO2 sediments, carrying out liquid preparation after TeO2 is roasted and nitrate is removed and returning to the electrodeposition process to directly recover the tellurium. According to the method, the high-tellurium residues is directly leached to recover the tellurium through the hydrochloric acid and the hydrogen peroxide, the direct recovery rate of the tellurium can reach above 95%, so that efficient recovery of the tellurium is realized, the recovery rate of silver can reach above 99.0%, and the recovery rate of lead can reach above 97.6%. The method has the advantages that the technological processes are simple, needed equipment is reduced, the production cost is low, the environment friendliness is high and the comprehensive recovery degree is high, thereby having wide application prospects.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy of nonferrous metals, in particular to a method for recovering tellurium from high tellurium slag materials. Background technique [0002] In the tellurium smelting process, a kind of slag with high tellurium content will be produced, and most of the tellurium exists in the form of metal tellurium, and it also contains some valuable elements such as lead, silver, and antimony, such as tellurium casting slag. A kind of scum. Most enterprises usually return this slag directly to the silver smelting oxidation refining pyrotechnic process, and enrich and recycle it in the later stage of tellurium slag production. The recovery rate of metal tellurium in the process is less than 40%, which not only causes waste of raw materials and low recovery rate, but also has disadvantages such as long process, high production cost, harsh operating conditions, and poor economic benefits. In addition, the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B11/00C22B13/00C25B1/00
CPCC22B7/007C22B7/04C22B11/044C22B13/045C25B1/00Y02P10/20
Inventor 蒋兆慧蒋朝金杨跃新许孔玉许军王强
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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