Method for separating and purifying crude cuprous telluride slag

A technology for cuprous telluride slag and cuprous telluride is applied in the directions of binary selenium/tellurium compound, selenium/tellurium preparation, selenium halide/tellurium, etc. The effect of reducing equipment investment, simple process flow and shortening process route

Inactive Publication Date: 2020-09-11
CNBM CHENGDU OPTOELECTRONICS MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing recovery method of cuprous telluride slag is to realize the separation of copper and tellurium through multiple processes of acid leaching, alkali dissolution, impurity removal, neutralization and alkali dissolution of crude cuprous telluride. The loss of materials in the process is serious, and the waste materials discharged are correspondingly increased, which is easy to cause the waste of raw materials and human resources. The environmental protection problems in the production process are also becoming more and more prominent. The corresponding environmental protection facilities also require a lot of investment, which not only causes environmental protection. It is also not conducive to the control of production costs
There are also reports of direct alkali-dissolution separation of cuprous telluride slag, but in the production process of this process, a large amount of entrainment cannot complete alkali dissolution, and the leaching rate is low, resulting in waste of acid and alkali
[0005] In summary, the current recovery technology of cuprous telluride slag has problems such as long process, low added value of products, low recovery rate, high input cost, and serious waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Take 5kg of coarse cuprous telluride slag and grind it to 100 meshes; in terms of mass fraction, the composition of the coarse cuprous telluride slag includes: Te 18%, Cu 39%, Se 3%, As 2.5% ,, Ag 0.04%.

[0033] Slurry the coarse cuprous telluride slag after grinding according to the solid-to-liquid ratio of 1:3, and then perform an oxidation leaching, that is, add 11L concentrated sulfuric acid solution (mass concentration: 98%) and 8L chlorine dioxide to the coarse cuprous telluride slag slurry In the mixed solution of sodium acid solution (mass concentration: 50-70g / L), heat to 70-90°C, stir for 50-60min, filter after cooling to 50-60°C, and then wash the filter residue to obtain 0.45Kg acid leaching residue and primary leachate;

[0034] Add the acid leaching residue to 1L of concentrated sulfuric acid solution (mass concentration is 98%) and 0.7L sodium chlorate solution (mass concentration is 50-70g / L) and stir, react for 2-3 hours, after the reaction is com...

Embodiment 2

[0044] (1) Take 5kg of coarse cuprous telluride slag and grind it to 100 meshes; in terms of mass fraction, the composition of the coarse cuprous telluride slag includes: Te 18%, Cu 39%, Se 3%, As 2.5% , Ag 0.04%.

[0045] Slurry the coarse cuprous telluride slag after grinding according to the solid-to-liquid ratio of 1:5, and then carry out an oxidation leaching, that is, add 21 L of hydrochloric acid solution (mass concentration percentage is 35%) and 9L of sodium chlorate solution (mass concentration: 50-70g / L), heated to 70-90°C, stirred for 50-60min, cooled to 50-60°C and then filtered to obtain 0.56Kg of acid leaching residue and primary leaching solution;

[0046] Add the acid leaching residue to 1.2L hydrochloric acid solution (mass concentration percentage is 35%) and 0.6L sodium chlorate solution (mass concentration is 50-70g / L) and stir, react for 2-3 hours, after the reaction is completed, cool After reaching 50-60°C, filter to obtain filter residue and secondary...

Embodiment 3

[0056] (1) Take 5kg of coarse cuprous telluride slag and grind it to 100 meshes; in terms of mass fraction, the composition of the coarse cuprous telluride slag includes: Te 18%, Cu 39%, Se 3%, As 2.5% , Ag 0.04%.

[0057] Slurry the coarse cuprous telluride slag after grinding according to the solid-to-liquid ratio of 1:7, and then perform an oxidation leaching, that is, add 23L hydrochloric acid solution (mass concentration percentage: 31%) and 17L Hydrogen peroxide solution (mass concentration percentage is 29%), heated to 70-90°C, stirred for 50-60min, filtered after cooling to 50-60°C, and then washed the filter residue to obtain 0.79Kg of acid leaching residue and primary leaching solution;

[0058] Add the acid leaching residue to 1.8L hydrochloric acid solution (mass concentration percentage: 31%) and 1L hydrogen peroxide solution (mass concentration percentage: 29%) and stir, react for 2-3 hours, after the reaction is completed, cool to 50-60°C Finally, filter, and t...

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PUM

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Abstract

The invention discloses a method for separating and purifying crude cuprous telluride slag. The method comprises the following steps that oxidation acid leaching is carried out on the crude cuprous telluride slag to remove impurities such as silver, selenium and the like in the crude cuprous telluride slag, then a leaching solution containing copper and tellurium is obtained; and after the pH value and the copper content of the leaching solution are adjusted, the leaching solution is subjected to extraction and reverse extraction operation through a hydroxyl crotch extraction agent, and the copper and the tellurium are separated. According to the method, traditional processes such as repeated acid leaching neutralization and impurity removal are not needed, the tellurium and the copper aredirectly separated through selection of the extraction agent, so that equipment investment is reduced, and the process route is shortened; and according to the method, the problems of high cost and aplurality of pieces of equipment caused by separating the crude cuprous telluride slag through the conventional procedures of acid leaching, neutralization, alkali dissolution, re-neutralization, impurity removal, acid leaching and the like in the prior art can be solved, and the method can reduce the problems of environmental pollution, incomplete separation and the like in the separation process.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a method for separating and purifying crude cuprous telluride slag. Background technique [0002] Tellurium is a kind of scattered element, which has been widely used as an additive in metallurgy and chemical industry. In addition, tellurium also plays an important role in the preparation of materials such as electronics and optics in modern high-tech fields. Tellurium is often associated with ores such as copper, lead and bismuth, and usually few separate tellurium deposits exist. At present, tellurium is mainly obtained from the by-products produced in the non-ferrous metal smelting process through comprehensive recovery. Copper anode slime and bismuth refining slag are the main sources of tellurium industrial recovery. [0003] Copper anode slime pretreatment methods mainly include sulfated roasting-water leaching process, air-stirred sulfuric acid direct l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B3/30C01B19/04
CPCC01B19/001C01B19/005C22B7/007C22B15/0069C22B15/0071C22B15/0084C22B3/30Y02P10/20
Inventor 潘锦功傅干华段杰明周毅郑林彭寿马立云
Owner CNBM CHENGDU OPTOELECTRONICS MATERIAL
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