A method for high-value zinc smelting intermediate materials and collaborative chlorine removal

A zinc smelting and high-value technology, applied in the field of high-value treatment technology, can solve problems such as poor activity, low bivalent copper content, and increased dechlorination costs, and achieve quick results, low operating costs, and improved copper slag. active effect

Active Publication Date: 2022-03-11
ZIJIN MINING GROUP +3
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the copper slag is replaced by zinc powder, the activity is poor (the main phase is elemental copper, and the content of divalent copper is low), so it is necessary to purchase copper sulfate, copper oxide, etc. to supplement the Cu2+ concentration in the solution to achieve dechlorination in the solution. removal, resulting in a sharp increase in the cost of dechlorination

Method used

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  • A method for high-value zinc smelting intermediate materials and collaborative chlorine removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this example, the amount of copper slag (low activity) added is 2% of the silver concentrate quality, and the mixed material of silver concentrate and copper slag contains Cu: 1.24%, Ag: 3629g / t, Pb: 2.04%, Zn: 30.86%, the dosage of sulfuric acid is 15% of the quality of silver concentrate, such as figure 1 As shown, the processing technology and effect are as follows:

[0026] (1) The mixture is roasted, roasting conditions: temperature 550 ° C, time 4h, air excess coefficient 1.2, the composition of the calcined sand and soot mixture is Cu: 1.42%, Pb: 2.31%, Zn: 34.83%, Ag : 4108.07g / t.

[0027] (2) The mixture of calcine and soot is leached out with chlorine-containing waste acid. Leaching conditions: temperature 80°C, liquid-solid ratio 10:1 (volume L / mass g), acidity 150g / L, time 1h, chlorine concentration in chlorine-containing waste acid 1.26g / L. The composition of acid leaching solution is Cu: 1.38g / L, Zn: 33.70g / L, Pb: 2.67mg / L, Ag: <0.1mg / L, Cl: 0.96g / L,...

Embodiment 2

[0032] In this example, the dosage of copper slag is 4.5% of the mass of silver concentrate, and the mixed material of silver concentrate and copper slag contains Cu: 2.32%, Ag: 3347g / t, Pb: 3.73%, Zn: 28.69%. sulfuric acid, such as figure 1 As shown, the processing technology and effect are as follows:

[0033] (1) The mixture is roasted, the roasting conditions are: temperature 600°C, time 3.5h, air excess coefficient 1.1, the composition of the calcined sand and soot mixture is Cu: 2.61%, Pb: 4.18%, Zn: 32.07%, Ag: 3748.82g / t.

[0034] (2) Leaching of calcine and soot mixture by using chlorine-containing waste acid. Leaching conditions: temperature 90°C, liquid-solid ratio 15:1 (volume L / mass g), acidity 50g / L, time 2h, chlorine concentration in chlorine-containing acidic liquid is 2.47g / L. The composition of the acid leaching solution is Cu: 1.64g / L, Zn: 20.98g / L, Pb: <0.1mg / L, Ag: <0.1mg / L, Cl: 2.04g / L, and the composition of the acid leaching residue is: Cu: 0.55%, Z...

Embodiment 3

[0039]In this example, the dosage of copper slag is 0.5% of the silver concentrate, and the mixture of silver concentrate and copper slag contains Cu: 1.04%, Ag: 3507g / t, Pb: 3.87%, Zn: 31.82%, sulfuric acid The input amount is 8% of the mass of silver concentrate, such as figure 1 As shown, the processing technology and effect are as follows:

[0040] (1) The mixture is roasted, roasting conditions: temperature 700 ° C, time 2h, air excess coefficient 1.2, the composition of the calcined sand and soot mixture is Cu: 1.17%, Pb: 4.35%, Zn: 35.65%, Ag : 3937.4g / t.

[0041] (2) Leaching of calcine and soot mixture by using chlorine-containing waste acid. Leaching conditions: temperature 90°C, liquid-solid ratio 20:1 (volume L / mass g), acidity 170g / L, time 3h, chlorine concentration in chlorine-containing acidic liquid is 0.8g / L. The composition of the acid leaching solution is Cu: 0.57g / L, Zn: 17.53g / L, Pb: <0.1mg / L, Ag: <0.1mg / L, Cl: 0.45g / L, and the composition of the acid l...

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Abstract

The invention discloses a method for increasing the value of zinc smelting intermediate materials and synergistically removing chlorine. By adding a certain proportion of low-activity copper slag to silver concentrate for oxidation and roasting, the activity of copper slag is improved, and the chlorine removal efficiency is increased from 30 ‑60% increased substantially to over 85%. The invention solves the problems of low dechlorination efficiency of copper slag alone, high cost of dechlorination of silver chloride and difficult recovery of silver by coupling copper slag and silver concentrate dechlorination technology; meanwhile, silver, copper, The cascade recovery and high-value utilization of valuable metals such as zinc and lead solve the problems of large pollution, high cost and low metal recovery rate in the existing process.

Description

technical field [0001] The invention relates to the field of non-ferrous metal smelting, in particular to a treatment process for synergistic dechlorination and high-value flotation of silver concentrate by using zinc smelting copper slag and acid leaching slag. Background technique [0002] The zinc acid leaching slag of hydrometallurgy produces high value-added silver concentrate after flotation, which contains a large amount of valuable metals such as silver, zinc, copper, lead, etc., and has huge economic value. At present, zinc smelting enterprises usually send flotation silver concentrate together with lead concentrate to the pyrometallurgical lead smelting system for comprehensive recovery of valuable metals such as lead, zinc, copper, and silver. However, this process has disadvantages such as complex process, poor furnace stability, high cost, dispersed silver, copper and zinc, low comprehensive metal recovery rate, and serious loss of economic benefits. [0003] C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B7/02C22B15/00C22B19/30C22B1/02C22B19/20
CPCC22B7/04C22B1/02C22B7/02C22B7/007C22B7/006C22B11/04C22B15/0084C22B19/30C22B19/26Y02P10/20
Inventor 林泓富衷水平陈杭吴星琳王俊娥石瑀张恒星
Owner ZIJIN MINING GROUP
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