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Method for preparing tellurium dioxide from tellurium slag

A technology for tellurium dioxide and tellurium slag is applied in the field of separation chemistry, which can solve the problems of complicated operation, low yield and low product purity, and achieve the effects of improving main grade, high replacement rate and reducing pollution.

Inactive Publication Date: 2013-04-10
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] To sum up the above, hydrometallurgy-replacement extraction of tellurium is the future development direction. Select scientific process route, efficient leaching agent, suitable replacement agent and reducing agent to maximize the recovery rate of tellurium and the purity of tellurium dioxide. To solve the problems of complicated operation, low yield and low product purity in the recovery process of tellurium in materials with low tellurium content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Method for preparing tellurium dioxide from low-grade tellurium slag

[0028] Raw materials: tellurium slag provided by a company A: the results of phase and quantitative analysis of the raw materials show that the main elements in this material contain Au128.3g / t, Ag 0.449%, Zn 9.07%, Cu 8.96%, Te 5.45%, in addition Contains Se, As, Bi, Sb and other impurity ions. This is a special material containing Zn, Cu and Te with variable composition, complex phase and different shapes.

[0029] (1) Take 600 grams of tellurium slag and add 4M H 2 SO 4 900ml, stirred at room temperature for one hour, added dropwise 180mL 10%H 2 o 2 , keep the temperature at 30-40°C, stir for half an hour after the addition, raise the temperature to 80-90°C, stir for 15 minutes, heat filter to obtain tellurium-containing immersion solution.

[0030] (2) Take about 90 grams of copper powder twice the theoretical amount, add it to the above-mentioned tellurium-containing immersion ...

Embodiment 2

[0037] Example 2 Method for preparing tellurium dioxide from low-grade tellurium slag

[0038] Raw material: Tellurium slag provided by a company B: The phase and quantitative analysis results of the raw material show that the main elements in this material include Pb 37.2%, Bi 6.32%, Sn 1.67%, Cu 8.96%, Te 3.15%, and Si in addition , As, Sb and other impurity ions. This is a special material containing Pb, Cu and Te with variable composition, complex phase and different shapes.

[0039] (1) Take 600 grams of tellurium slag and add 4M H 2 SO 4 500ml, stirred at room temperature for one hour, added dropwise 100mL 10%H 2 o 2 , keep the temperature at 30-40°C, stir for half an hour after the addition, raise the temperature to 80-90°C, stir for 15 minutes, heat filter to obtain tellurium-containing immersion solution.

[0040] (2) Take about 50 grams of copper powder twice the theoretical amount, add it to the above-mentioned tellurium-containing immersion solution, carry ...

Embodiment 3

[0047] Example 3 Method for preparing tellurium dioxide from low-grade tellurium slag

[0048] Raw materials: Tellurium slag provided by a company C: The phase and quantitative analysis results of the raw materials show that the main elements in this material include Pb 43.2%, Si 0.94%, Fe 0.22%, Cu 0.23%, Te 3.92%, and Se , As, Sb and other impurity ions. This is a special material containing Pb, Cu and Te with variable composition, complex phase and different shapes.

[0049] (1) Take 600 grams of tellurium slag and add 4M H 2 SO 4 600ml, stirred at room temperature for one hour, added dropwise 120mL 10%H 2 o 2 , keep the temperature at 30-40°C, stir for half an hour after the addition, raise the temperature to 80-90°C, stir for 15 minutes, heat filter to obtain tellurium-containing immersion solution.

[0050] (2) Take about 65 grams of copper powder twice the theoretical amount, add it to the above-mentioned tellurium-containing immersion solution, carry out displa...

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Abstract

The invention relates to a method for preparing tellurium dioxide from tellurium slag. According to the technical scheme, the method comprises the following steps of: adding tellurium slag to sulfuric acid solution, stirring at normal temperature, adding 10% oxydol at the temperature of 30-40 DEG C, and then heating to 80-90 DEG C, and leaching under normal pressure; adding copper powder to leachate, carrying out replacement reaction at the temperature of 90-95 DEG C for 2 hours, and carrying out solid-liquid separation to obtain copper telluride slag; adding copper telluride slag to sulfuricacid solution, adding 10% oxydol, stirring at the temperature of 90 DEG C for 1 hour, and filtering; adding sodium carbonate to filtrate for neutralizing the filtrate till pH of the filtrate is 3, and filtering; adding NaOH to filter residue, carrying out alkali leaching and stirring at the temperature of 85-95 DEG C for 1 hour, and filtering; and adding H2SO4 to filtrate for neutralizing the filtrate till pH of the filtrate is 6-7, filtering, washing and drying to obtain a product. The method has the characteristics that: low-grade tellurium-containing material discarded by a copper anode mud production enterprise is used as a raw material to produce high-purity tellurium dioxide, the process is reasonable and pollution-free, and the recovery rate of tellurium is high.

Description

technical field [0001] The invention belongs to the field of separation chemistry, in particular to a method for extracting tellurium from low-grade tellurium slag to prepare tellurium dioxide. Background technique [0002] Tellurium is one of the scattered elements and has many excellent properties. It is the main material for making semiconductors, refrigeration components, and photoelectric components. It is widely used in high-tech fields such as aviation, aerospace, and electronics. With the rapid development of high-tech in aerospace, military, electronics, refrigeration, glass, and organic synthesis industries, the demand and purity requirements for tellurium and its compounds are getting higher and higher. [0003] The main source of tellurium is copper anode slime, with Te 2- 、 Te 4+ 、 Te 6+ The valence exists in the compound. Tellurium has a tendency to autodistribute in filtrates and residues of hydrometallurgical processes, while it also has a tendency to be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/04
Inventor 熊英单炜军娄振宁
Owner LIAONING UNIVERSITY
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