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A method for removing copper, lead and tellurium from copper smelting coarse selenium powder by controlled potential

A technology for copper smelting and crude selenium, which is applied in the field of metallurgical impurity removal, can solve the problems of difficulty in further improving the purity of selenium, difficult to effectively remove, etc., and achieves the effects of easy operation, low selenium loss and high selenium purity.

Active Publication Date: 2021-06-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above method, because the physical and chemical properties of the impurity tellurium in the coarse selenium powder are very similar to the main metal element selenium, it is difficult to effectively remove it by means such as distillation, and it is difficult to further improve the purity of selenium

Method used

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  • A method for removing copper, lead and tellurium from copper smelting coarse selenium powder by controlled potential
  • A method for removing copper, lead and tellurium from copper smelting coarse selenium powder by controlled potential

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Copper smelting coarse selenium powder includes the following components in mass percentage: Se 75.04%, Te 7.08%, Pb 2.78%, Cu 4.7%, and the balance is water, Fe and other impurities;

[0050] Add 1L of deionized water to 1kg of copper smelting coarse selenium powder, stir and adjust slurry to obtain selenium slurry;

[0051] Adding 390mL of dilute sulfuric acid with a mass concentration of 25% in the obtained selenium slurry, adjusting the pH value of the selenium slurry system to 1, and smelting crude selenium with 20mL / min / 1kg copper of 10% oxidant potassium permanganate solution with a mass concentration of 51mL The addition rate of the powder is added to the selenium mud and supplemented by 500rpm stirring, and the oxidation potential of the control system is 600mV, so that the impurities Cu and Pb are converted into soluble ions. After stirring for 1.5h, the material is press-filtered and washed to neutral to remove Cu. and Pb, to obtain primary selenium;

[0052...

Embodiment 2

[0059] Copper smelting coarse selenium powder includes the following components in mass percentage: Se 63.9%, Te 9.31%, Pb 2.78%, Cu 1.7%, and the balance is water, Fe and other impurities;

[0060] Add 0.5L of deionized water to 1kg of copper smelting coarse selenium powder, stir and adjust slurry to obtain selenium slurry;

[0061] Adding 260mL of mass concentration to the obtained selenium slurry is 30% dilute sulfuric acid to adjust the pH of the selenium slurry system to be 2, and 60mL of mass concentration is 15% oxidant sodium hypochlorite solution at a rate of 30mL / min / 1kg copper smelting coarse selenium powder Add selenium mud and stir at 500rpm, control the oxidation potential of the system to 500mV, convert impurities Cu and Pb into soluble ions, stir for 2 hours, press filter and wash the materials until neutral, thereby removing Cu and Pb, and obtaining primary selenium;

[0062] Adding 39mL of mass concentration to the primary selenium is 15% reductant ferrous c...

Embodiment 3

[0067] Copper smelting coarse selenium powder includes the following components in mass percentage: Se 78.9%, Te 8.31%, Pb 1.78%, Cu 4.7%, and the balance is water, Fe and other impurities;

[0068] Add 0.8L deionized water to 1kg copper smelting coarse selenium powder, stir and adjust the slurry to obtain selenium slurry;

[0069] Adding 305mL mass concentration to the obtained selenium mud is 28% dilute sulfuric acid, the pH of the adjustment system is 1.5, and 41mL mass concentration is 30% oxidant hydrogen peroxide solution with the addition rate of 50mL / min / 1kg copper smelting coarse selenium powder Add selenium mud and stir at 800rpm, control the oxidation potential of the system to 450mV, convert impurities Cu and Pb into soluble ions, stir for 1 hour, press filter and wash the material until neutral, thereby removing Cu and Pb, and obtaining primary selenium;

[0070] Add 68mL mass concentration to primary selenium and be the reductant ferrous sulfate solution of 20%,...

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Abstract

The invention belongs to the technical field of metallurgical impurity removal, and in particular relates to a method for removing copper, lead and tellurium from copper smelting coarse selenium powder by controlling electric potential. The invention provides a method for removing copper, lead and tellurium in coarse selenium powder from copper smelting by controlling electric potential, comprising the following steps: mixing the coarse selenium powder from copper smelting to obtain selenium slurry; performing a first step on the selenium slurry After the pH value is adjusted, an oxidizing agent is added to the oxidation potential, followed by the first precipitation reaction and the first filtration to remove copper and lead in the copper smelting coarse selenium powder to obtain primary selenium; the oxidation potential is 400-800mV; the The primary selenium is mixed with the reducing agent to the reduction potential, and after the second pH value adjustment, the second precipitation reaction and the second filtration are carried out in sequence to remove tellurium in the copper smelting coarse selenium powder; the reduction potential is -400~0mV. The test results show that the method provided by the invention realizes efficient removal of impurities copper, lead and tellurium in the coarse selenium powder for copper smelting.

Description

technical field [0001] The invention belongs to the technical field of metallurgical impurity removal, and in particular relates to a method for removing copper, lead and tellurium from copper smelting coarse selenium powder by controlling electric potential. Background technique [0002] Selenium is an important scattered metal, and the vast majority of selenium is produced as a by-product of copper smelting. In the copper smelting process, crude copper is electrolytically refined to produce high value-added anode slime, and copper anode slime is comprehensively recovered by pyrometallurgy or hydrometallurgy to produce coarse selenium powder for copper smelting. In terms of mass percentage, the main chemical composition of typical copper smelting coarse selenium powder is Se 60-80%, Te 1-10%, Cu 0.01-5%, Pb 0.01-5%, H 2 O 5~30%, the rest are trace elements such as Fe, S, Sn, As and Ni. Copper smelting coarse selenium powder must be purified to produce 99.99% high-purity s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/02C22B7/00C22B15/00C22B13/00
CPCC01B19/02C22B7/007C22B13/04C22B15/0071Y02P10/20
Inventor 杨斌查国正蒋文龙徐宝强刘大春孔祥峰罗欢黄大鑫郭新宇邓聚海陈秀敏李一夫郁青春杨红卫田阳邓勇王飞熊恒杨佳吴鉴
Owner KUNMING UNIV OF SCI & TECH
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