Method for producing tellurium dioxide by self-purification of crude tellurium powder

A tellurium dioxide, self-purification technology, applied in the direction of selenium/tellurium oxide/hydroxide, binary selenium/tellurium compound, etc., can solve the problems of long process and low recovery rate, achieve short process and shorten the process flow , the effect of reducing the content

Active Publication Date: 2020-06-12
JIANGXI COPPER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] In the above several tellurium enrichment and purification methods, the effective enrichment of tellurium and the production of refined tellurium products above 4N can be realized. The process is long and the recovery rate is not high

Method used

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  • Method for producing tellurium dioxide by self-purification of crude tellurium powder

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Effect test

Embodiment 1

[0048] The coarse tellurium powder derived from copper and lead anode mud generally contains a small amount of impurities such as Cu, Pb, Bi, Sb, Ag, Na, and Se. Impurities such as Cu, Pb, Bi, Sb, Na, etc. can be preliminarily separated by washing with a small amount of oxidant in the hydrochloric acid medium; the oxide slag (tellurium dioxide slag) produced has a higher impurity content, and the subsequent purification to produce 4N tellurium requires alkali Processes such as leaching and purification are subjected to further impurity removal treatment, the process flow is long, there are many side reactions in the process, and the yield of tellurium is low and unstable. In this scheme, the crude tellurium powder is subjected to pressure oxidation-autoclave treatment under alkaline conditions, the reaction temperature is controlled at 110°C, the pressure oxidation time is 100 min, the autoclave time is 100 min, and the alkalinity of the reaction system is 57 g / l; After the com...

Embodiment 2

[0050] The coarse tellurium powder derived from copper and lead anode mud generally contains a small amount of impurities such as Cu, Pb, Bi, Sb, Ag, Na, and Se. Impurities such as Cu, Pb, Bi, Sb, Na, etc. can be preliminarily separated by washing with a small amount of oxidant in the hydrochloric acid medium; the oxide slag (tellurium dioxide slag) produced has a higher impurity content, and the subsequent purification to produce 4N tellurium requires alkali Processes such as leaching and purification are subjected to further impurity removal treatment, the process flow is long, there are many side reactions in the process, and the yield of tellurium is low and unstable. In this scheme, under alkaline conditions, the crude tellurium powder is subjected to pressure oxidation-autoclave treatment, the reaction temperature is controlled to 100 ℃, the pressure oxidation time is 40 min, the autoclave time is 20 min, and the alkalinity of the reaction system is 60 g / l; After the comp...

Embodiment 3

[0052] The coarse tellurium powder derived from copper and lead anode mud generally contains a small amount of impurities such as Cu, Pb, Bi, Sb, Ag, Na, and Se. Impurities such as Cu, Pb, Bi, Sb, Na, etc. can be preliminarily separated by washing with a small amount of oxidant in the hydrochloric acid medium; the oxide slag (tellurium dioxide slag) produced has a higher impurity content, and the subsequent purification to produce 4N tellurium requires alkali Processes such as leaching and purification are subjected to further impurity removal treatment, the process flow is long, there are many side reactions in the process, and the yield of tellurium is low and unstable. In this scheme, the crude tellurium powder is subjected to pressure oxidation-autoclave treatment under alkaline conditions, the reaction temperature is controlled at 90°C, the pressure oxidation time is 20 min, the autoclave time is 40 min, and the alkalinity of the reaction system is 65 g / l; After the comple...

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Abstract

The invention belongs to the technical field of nonferrous metallurgy. The invention relates to tellurium dioxide, in particular to a method for producing high-quality tellurium dioxide through self-purification of crude tellurium powder. The method comprises the following steps: carrying out pressurized oxidation-pressure boiling treatment on a material containing crude tellurium powder by utilizing a reaction container; after the reaction is finished, filtering a reaction product to obtain autoclaved liquid, and carrying out oxidation neutralization on the autoclaved liquid for selenium removal, thus preparing high-quality tellurium dioxide residue serving as a raw material for following production of 4N tellurium; according to the method, self-purification of impurities in the crude tellurium powder is achieved through oxidation neutralization after pressurized oxidation-pressure boiling treatment, the content of impurity elements in the produced tellurium dioxide can be remarkablyreduced, the quality of the tellurium dioxide is improved, and the subsequent refined tellurium production technological process is shortened. The method is short in process and low in cost, the effect of improving the quality of tellurium dioxide produced by taking crude tellurium powder as a raw material is obvious, and the obtained tellurium dioxide slag contains more than or equal to 70% of tellurium, less than 0.02% of arsenic, less than or equal to 0.01% of copper, less than or equal to 0.01% of selenium, less than 0.01% of lead and less than 0.03% of tin.

Description

Technical field [0001] The invention belongs to the technical field of non-ferrous metal metallurgy, and specifically relates to a method for producing tellurium dioxide by self-purification of coarse tellurium powder produced by using coarse tellurium powder as a raw material. Background technique [0002] Tellurium is one of the indispensable materials in modern industry and high-tech industry. It is called "the vitamin of modern industry, national defense and cutting-edge technology". It is widely used in chemical, metallurgy, medicine, glass ceramics, electronics, national defense, energy and other fields . [0003] The tellurium element produced in industry mainly comes from the anode mud in the copper electrolytic refining process, usually containing 1% to 10% tellurium, most of which are Ag 2 Te, Cu 2 Te, Au 2 Te and other forms exist. Since the tellurium content is not high, in order to facilitate the subsequent extraction and purification of tellurium, separation and enri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
CPCC01B19/004Y02P10/20
Inventor 杨兴文张飞吴杰涂相林肖亚松钟志燕刘海华祝仕清邹志武
Owner JIANGXI COPPER
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