Technology for recovering tellurium from high-tellurium slag

A process and slag technology, 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 the effects of low production cost, less equipment and significant economic benefits

Inactive Publication Date: 2016-09-28
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • 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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  • Technology for recovering tellurium from high-tellurium slag

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Effect test

Embodiment 1

[0020] Example 1: 5000 g of high tellurium slag material (Te73.18%, 3659g; Pb0.64%, 32g; Ag0.055%, 2.75g) was crushed to a particle size ≤ 10mm, and 16L aqua regia solution prepared in advance was slowly added Stir continuously in the reaction tank. After the reaction is complete, liquid-solid separation is carried out to obtain tellurium-containing leaching solution and leaching slag. The leaching slag is tempered and the lead smelting system recovers valuable elements such as Ag and Pb. The leaching solution was neutralized with sodium hydroxide solution until the final pH was 6. Tellurium dioxide precipitate was obtained after liquid-solid separation, and the weight of tellurium dioxide was 4665.85g after denitrification and selenium removal by calcination. The tellurium content was 77.3% (tellurium metal content) by sampling analysis. 3606.7g), the recovery rate of tellurium is as high as 98.57%, the recovery rate of silver is >99.4%, and the recovery rate of lead is >97.6%...

Embodiment 2

[0021] Example 2: 5000 g of high tellurium slag material (Te71.08%, 3554g; Pb0.79%, 39.5g; Ag0.062%, 3.1g) was crushed to a particle size of ≤10mm, and the pre-prepared 12L aqua regia solution was slowly Add it into the reaction tank and keep stirring. After the reaction is complete, liquid-solid separation is carried out to obtain tellurium-containing leaching solution and leaching slag. The leaching slag is tempered and the lead smelting system recovers valuable elements such as Ag and Pb. The leaching solution was neutralized with sodium hydroxide solution until the final pH was 6. Tellurium dioxide precipitate was obtained after liquid-solid separation, and the weight of tellurium dioxide was 4598.7g after denitrification and selenium removal by calcination. The tellurium content was 74.12% (the amount of tellurium metal) analyzed by sampling. 3408.56g), the recovery rate of tellurium is 95.91%, the recovery rate of silver is >99.0%, and the recovery rate of lead is >98.1%....

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Abstract

The invention provides a technology for recovering tellurium from high-tellurium slag. The technology comprises 1, crushing high-tellurium slag until granularity is less than or equal to 10mm, 2, pouring the broken high-tellurium slag into a reactor, slowly adding aqua regia into the high-tellurium slag and carrying out oxidation leaching, 3, after the slag is completely dissolved, carrying out liquid-solid separation so that a main element tellurium enters the leachate and Pb and Ag valuable metals enter slags, returning the Pb and Ag slags to a Pb smelting system and recovering valuable metals, and 4, preparing a solution of caustic soda flakes, slowly adding the solution into the tellurium-containing leachate, adjusting pH to 5.0-6.0, carrying out solid-liquid separation to obtain TeO2 precipitates, carrying out calcining denitration on the TeO2, carrying out liquid preparation, returning the liquid to an electrodeposition process and directly recovering metal Te. The technology has the characteristics of simple processes, less equipment, low production cost and high comprehensive recovery degree and has a certain application prospect.

Description

technical field [0001] The invention relates to a process for recovering tellurium from high tellurium slag material, which belongs to the field of nonferrous metal hydrometallurgy. Background technique [0002] In the tellurium smelting process, a kind of slag with high tellurium content will be produced. Most of the tellurium exists in the form of metal tellurium, and it also contains some valuable elements such as lead, silver and antimony. For example, tellurium casting slag is Such a scum. Most enterprises usually return the slag directly to the tellurium slag-making stage in the later stage of the silver smelting oxidation refining pyrotechnic process for enrichment and recovery. The recovery rate of tellurium metal 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, poor operating conditions and poor economic benefits. [0003] October 28, 2009; Chinese invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
CPCC01B19/004C01P2006/80
Inventor 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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