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Low temperature and low pressure countercurrent leaching method for tellurium in copper anode slime

A copper anode slime, countercurrent leaching technology, applied in the direction of element selenium/tellurium, process efficiency improvement, etc., can solve the problems of limited promotion and application, poor operating conditions, low tellurium recovery rate, etc., to reduce cycle accumulation and increase economy Benefit, solve the effect of low tellurium removal rate

Active Publication Date: 2017-12-05
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process uses mixed acid of nitric acid and sulfuric acid, which requires too high corrosion resistance of the equipment, and the operating conditions are harsh, so the popularization and application are limited
[0007] In the practice of processing copper anode slime in the Kaldor furnace, after the copper anode slime is pretreated and decoppered, tellurium is only recovered as an additional product, so the recovery rate of tellurium is not high
The tellurium-containing Kaldor furnace smelting slag returns to the large smelting system, causing the cycle accumulation of tellurium, so finding a method that can efficiently recover tellurium is of great significance for the Kaldor furnace method to treat copper anode slime

Method used

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  • Low temperature and low pressure countercurrent leaching method for tellurium in copper anode slime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The copper anode slime treated in this example contains Cu20.26% and Te2.01%. The treatment process and treatment effect are as follows:

[0026] (1) Wash the copper anode slime in a washing tank, the liquid-solid ratio is 4:1 by volume to mass ratio L / Kg, the temperature is 30°C, and the time is 0.8h; the washing slag contains 14.5% copper and 2.25% tellurium.

[0027] (2) Put the water-washed slag in the reaction kettle for one oxygen pressure acid leaching to remove copper, control the liquid-solid ratio by volume to mass ratio L / Kg to 5:1, the acidity of sulfuric acid is 200g / L, the temperature is 100°C, and the oxygen partial pressure is 1.2 MPa, time 0.5h; primary leaching slag contains 5.22% copper and 1.85% tellurium.

[0028] (3) Put the primary leaching residue in an autoclave for secondary leaching, control the liquid-solid ratio by volume to mass ratio L / Kg to 10:1, sulfuric acid acidity 200g / L, temperature 180°C, oxygen partial pressure 0.8MPa, time 1.5 h;...

Embodiment 2

[0031] The copper anode slime treated in this example contains Cu20.26% and Te2.01%. The treatment process and treatment effect are as follows:

[0032] (1) Wash the copper anode slime in a washing tank with a liquid-solid ratio of 5:1 by volume to mass ratio L / Kg at a temperature of 40°C for 0.5 hours; the washing slag contains 12.91% copper and 2.41% tellurium.

[0033] (2) Put the water-washed slag in the reaction kettle for oxygen pressure acid leaching to remove copper, control the liquid-solid ratio according to the volume and mass ratio L / Kg to 7:1, the acidity of sulfuric acid is 150g / L, the temperature is 120°C, and the oxygen partial pressure is 1MPa , time 1h; the first leaching slag contains 4.18% copper and 1.97% tellurium.

[0034] (3) Put the primary leaching residue in an autoclave for secondary leaching, control the liquid-solid ratio by volume to mass ratio L / Kg to 15:1, sulfuric acid acidity 250g / L, temperature 160°C, oxygen partial pressure 1.2MPa, time 1h ...

Embodiment 3

[0037] The copper anode slime treated in this example contains Cu20.26% and Te2.01%. The treatment process and treatment effect are as follows:

[0038] (1) Put the copper anode slime in the washing tank for washing, the liquid-solid ratio is 3:1 according to the volume-to-mass ratio L / Kg, the temperature is 50°C, and the time is 1h; the washing slag contains 15.27% copper and 2.17% tellurium.

[0039] (2) Put the water-washed slag in the reaction kettle for one oxygen pressure acid leaching to remove copper, control the liquid-solid ratio by volume to mass ratio L / Kg to 10:1, the acidity of sulfuric acid is 100g / L, the temperature is 130°C, and the oxygen partial pressure is 0.5 MPa, time 1.5h; primary leaching slag contains 4.76% copper and 1.59% tellurium.

[0040] (3) Put the primary leaching residue in an autoclave for secondary leaching, control the liquid-solid ratio by volume to mass ratio L / Kg to 8:1, sulfuric acid acidity 150g / L, temperature 120°C, oxygen partial pre...

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Abstract

The invention discloses a method of low-temperature and low-pressure countercurrently leaching tellurium from copper anode mud. In the invention, according to the solubility of tellurium in a sulfuric acid system, under a low temperature and low pressure condition, the copper anode mud, after water washing, is processed through the processes of performing countercurrent leaching process to controlled-leaching the tellurium, feeding a secondary leaching solution to the primary leaching step, and recycling the copper and tellurium from the primary leaching solution, and ending the process. The method can significantly improves the effect of removing copper and tellurium from the copper anode mud during a pre-treatment process before material feeding in a Kaldo furnace smelting process. On the basis of ensuring copper removal rate, leaching of the tellurium is enhanced, so that the method is more than 99% in copper removal rate and is 70-85% in tellurium removal rate. The method reduces circulating accumulation of the tellurium in the system, reduces or avoids influences of the tellurium on subsequent noble metal recovery, and increases economic benefit of enterprises through centralized treatment.

Description

technical field [0001] The invention relates to a method for secondary recovery and utilization of mineral resources, in particular to a method for strengthening tellurium leaching in copper anode slime, in particular to a method for strengthening tellurium leaching by changing the leaching conditions and operation mode according to the solubility of tellurium in acidic solution. Background technique [0002] Scattered metal tellurium has many good physical properties, and is an indispensable key material for manufacturing components such as optoelectronics, semiconductors, and refrigeration, and is widely used in high-tech fields such as aerospace, military, and electrical. With the increasing demand for the quantity and quality of tellurium in the market, how to extract tellurium from tellurium-containing materials has become an important research direction. [0003] In the earth's crust, tellurium mainly exists in minerals such as gold, silver, copper, lead and nickel in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/02C22B7/00C22B15/00
CPCC01B19/02C22B7/007C22B15/0071Y02P10/20
Inventor 王俊娥张焕然衷水平熊家春林泓富苏秀珠吴健辉张永锋刘建强陈杭
Owner ZIJIN MINING GROUP
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