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Process for preparing tellurium dioxide

A tellurium dioxide and process technology, which is applied in the field of producing tellurium dioxide, can solve the problems of low leaching rate, low recovery rate, and large investment in equipment costs, and achieve the effect of improving the recovery rate

Active Publication Date: 2019-09-20
YANGGU XIANGGUANG COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copper and tellurium in acidic strong oxidizing solution are difficult to separate, using oxalic acid to remove copper is expensive and difficult to filter, and the valence composition of tellurium in strong oxidation leaching is complex, the recovery rate is not high, and the loss is large; the leaching rate is low in alkaline leaching , there is a large amount of peroxidation or incomplete oxidation, and the alkali leaching slag contains a large amount of copper slag, especially in the case of high copper slag, it is difficult to filter and inconvenient to operate; high-pressure leaching has high equipment investment and is prone to peroxidation, and the equipment Large cost input, poor adaptability to multiple materials

Method used

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  • Process for preparing tellurium dioxide
  • Process for preparing tellurium dioxide
  • Process for preparing tellurium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 200kg tellurium copper slag, add water according to the liquid-solid ratio of 6:1, add 65kg of 93% sulfuric acid, add 50kg of hydrochloric acid, stir and react for 15min, feed chlorine gas at 50L / min until the final pH is controlled to 3, the reaction temperature is 75°C, and the reaction Time 2h, get high tellurium slag 120kg;

[0036]The high tellurium slag was mixed with water according to the liquid-solid ratio of 6:1, the temperature was raised to 75°C, sulfur dioxide was introduced at 30L / min for 0.5h, the pH was controlled by hydrochloric acid to 1, and then 75kg of caustic soda was added, and the reaction time was 2h to obtain the fraction Tellurium tailings 23kg, tellurium leaching solution 843L;

[0037] The temperature of the tellurium leaching solution was raised to 70°C, and 1:1 diluted 93% sulfuric acid was slowly added to control the pH to 5-6, and 87kg of tellurium dioxide was obtained by filtration.

[0038] The data of the raw materials and produ...

Embodiment 2

[0044] Take 200kg tellurium-copper slag, add water according to the liquid-solid ratio of 5:1, add 75kg of 93% sulfuric acid, add 44kg of hydrochloric acid, stir and react for 15min, feed chlorine gas at 50L / min to finally control pH = 3, and react at a temperature of 75°C. Time 2h, obtain high tellurium slag 103kg;

[0045] Mix the high tellurium slag according to the liquid-solid ratio of 6:1, raise the temperature to 75°C, feed sulfur dioxide 30L / min for 0.5h, control the pH=1 by hydrochloric acid, add 65kg of caustic soda, and react for 2h to obtain the tellurium tail 15kg of slag, 742L of tellurium leaching solution;

[0046] Raise the temperature of the tellurium leaching solution to 70°C, slowly add 1:1 diluted 93% sulfuric acid to control the pH to 5-6, and filter to obtain 68kg of tellurium dioxide.

[0047] The data of the raw materials and products involved in the above-mentioned preparation process are shown in the following table:

[0048] Table 2 Example 2 prep...

Embodiment 3

[0053] Take 200kg tellurium copper slag, add water according to the liquid-solid ratio of 6:1, add 67kg of 93% sulfuric acid, add 40kg of hydrochloric acid, stir and react for 15min, feed chlorine gas at 50L / min until the final pH is controlled to 3, the reaction temperature is 75°C, and the reaction Time 2h, obtain high tellurium slag 132kg;

[0054] Mix the high tellurium slag according to the liquid-solid ratio of 6:1, raise the temperature to 75°C, feed sulfur dioxide 30L / min for 0.5h, control the pH=2 with hydrochloric acid, add 75kg of caustic soda, and react for 2h to obtain the tellurium tail 27kg of slag, 870L of tellurium leaching solution;

[0055] The temperature of the tellurium leaching solution was raised to 70°C, and 93% sulfuric acid diluted 1:1 was slowly added to control the pH between 5 and 6, and 69kg of tellurium dioxide was obtained by filtration.

[0056] The data of the raw materials and products involved in the above-mentioned preparation process are...

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Abstract

The invention provides a process for preparing tellurium dioxide. The process comprises the following steps: (A) enabling tellurium copper slag to be pulpified and then adding mixed acid to react to obtain pre-leaching slurry; (B) enabling the pre-leaching slurry to react with an oxidizing agent and then adjusting the pH value to 2-4 to obtain high-copper liquid and tellurium-rich slag; (C) enabling the tellurium-rich slag to be pulpified and then react with a transformation agent and an impurity-removing agent to obtain transformation slurry; and enabling the transformation slurry to react with alkali to obtain tellurium-separated tailings and tellurium leach liquor; and (D) hydrolyzing the tellurium leach liquor to obtain the tellurium dioxide. The invention firstly provides the steps of pre-leaching to remove copper through controlling a weak acid environment, then oxidizing self-precipitated tellurium, separating the tellurium from the copper effectively and then removing impurities and transformed high-valence tellurium through adding the transformation agent and the impurity-removal agent before alkali leaching, the steps of the process realize multiple functions in a short condition and are easy to control, so that the leaching rate is high, the impurity-removing effect is good, and the recovery rate of the copper and the tellurium is high.

Description

technical field [0001] The invention relates to the technical field of rare metal recovery, in particular to a process for preparing tellurium dioxide. Background technique [0002] The content of tellurium metal is rare, but it is widely used in some specific fields, such as: refrigeration and heating of solar cells, catalyst for petroleum cracking, brightener for electroplating solution, coloring material for glass, additive to increase the ductility of steel, and to increase Lead is an additive for strength and corrosion resistance, and further, tellurium and its compounds are a semiconductor material. Therefore, although the content of tellurium is rare, it is widely used, so the demand for tellurium is still very large. [0003] The extraction sources of tellurium are mainly copper anode slime and tellurium-containing waste; at present, copper powder is widely used in industrial applications to replace tellurium into tellurium-copper slag, and then the tellurium-copper...

Claims

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Application Information

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IPC IPC(8): C01B19/04
CPCC01B19/004C01P2006/80
Inventor 谢祥添余华清韩义忠赵宁宁刘连杰范宗伟
Owner YANGGU XIANGGUANG COPPER
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