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Combined process for organic solvent extracting zinc and wet zinc refining

A technology of zinc hydrometallurgy and organic solvents, applied in the combined process field, can solve the problems of raw material shortage, low grade, and insufficient production capacity, etc., and achieve the effect of flexible configuration

Active Publication Date: 2006-11-08
YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Non-ferrous metallurgy is a typical resource-based industry, but the non-renewable nature of mineral resources and the increasing demand for non-ferrous metals in the national economy force people to use resources that were previously considered unusable, renewable resources, and secondary resources, and these resources are often complex in composition, high in harmful impurities or low in grade, and are not suitable for treatment by traditional hydrometallurgy technology
On the other hand, the zinc smelting capacity that has been built in my country and even the world is very large. The resource crisis faced by these smelting capacity is getting closer and closer. Due to the shortage of raw materials, the production capacity cannot be fully utilized. How to use the traditional production capacity to deal with Raw materials that cannot be processed by traditional processes are new issues faced by zinc smelting enterprises

Method used

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  • Combined process for organic solvent extracting zinc and wet zinc refining

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] the element

[0026] After leaching with dilute sulfuric acid, the solution contains 52 g / L of Zn, 60 mg / L of Co, and 128 mg / L of Ni. It is very difficult to remove Co and Ni by the solution purification technology in the conventional hydrometallurgy process.

[0027] the element

[0028] After separating Zn from Co and Ni through this process, zinc ions are selectively transferred to the waste electrolyte, and then electrolytically produced through the leaching and purification process of the conventional wet zinc smelting process. The raffinate is returned to the acid leaching of low-grade and high-impurity zinc materials and recycled, achieving the purpose of using high Co and Ni zinc oxide ore with conventional hydrometallurgy zinc production capacity, and no waste water is produced. The organic matter after stripping is also returned to the leaching of low-grade and high-impurity zinc materials for recycling.

example 2

[0031] Fe in solution is Fe +2 , due to Fe and SO 4 2- The content is high, it is not suitable for the production of zinc chloride products, the use of P 204 After the zinc is extracted, the electrolytic waste liquid is used for back extraction, and the zinc ions can be transferred to the waste electrolyte.

[0032] Dilute the solution to 60 g / L Zn with 20% P 204 Solvent extraction mixed with 260# kerosene, the extraction ratio is O / A=2.5 / 1, the acid produced is neutralized with NaOH solution during the extraction process, after a first-stage extraction, the extraction mixing time is 5 minutes, and the extraction temperature is 20 ° C ~ 40 °C, the end point pH is 3.6, and the raffinate contains less than 0.5 g / L of zinc. After phase separation and clarification, use H 2 SO 4 180 g / L of waste electrolyte is used for back-extracting zinc, the stripping ratio is O / A=2 / 1, the stripping temperature is 20°C-40°C, and the zinc content of the waste liquid increases from 4...

example 3

[0034] A zinc-containing mineral contains 8.54% zinc, of which the oxidation rate of zinc is 84.5%.

[0035] Leach with a solution containing dilute sulfuric acid, the solution contains 10.2 g / l to 12.5 g / l of zinc, 0.7 mg / l to 1.5 mg / l of Fe, and the zinc leaching rate is 72% to 75%.

[0036] with 35%P 204 It is mixed with 260# kerosene to form an extraction solvent, and it is subjected to three-stage countercurrent extraction, O / A=1 / 1, the extraction mixing time is 1 minute, the extraction temperature is 30°C, the raffinate contains Zn 2.5-4.5 g / L, and contains H 2 SO 4 13-15 g / L, and the organic phase contains Zn 8-10 g / L. The organic phase is back-extracted with a waste electrolyte containing 180 g / L of acid and 45 g / L of Zn. The back-extraction ratio is O / A=5 / 1, the back-extraction temperature is 40°C, and the back-extraction solution contains 95-100 g / L of Zn. Liters with H 2 SO 4 95-100 g / L, the back-extraction solution is returned to conventional wet zinc leaching...

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Abstract

The present invention belongs to the field of wet zinc smelting technology, and is one combined technological process of organic solvent extraction of zinc and wet smelting of zinc. The combined technological process includes organic solvent extraction of low grade and high impurity content zinc material, wet zinc smelting, reverse extracting the zinc containing organic phase with the waste electrolyte from wet zinc smelting, returning the reverse extracted liquid to the wet zinc smelting, and returning the reverse extracted organic phase to the organic solvent extraction. The present invention has best utilization of zinc resource and less environmental pollution.

Description

technical field [0001] The invention belongs to the field of zinc hydrometallurgy, and is a joint process formed by combining the zinc solvent extraction technology with the traditional hydrometallurgy process. Background technique [0002] Traditional zinc hydrosmelting includes leaching of zinc-containing minerals - solution purification, electrowinning. The electrowinning of zinc is very sensitive to impurity elements, and has strict requirements on the content of F, Cl, As, Sb, Co, Ni, Ge, etc. As, Sb, Co, Ni, Ge, etc. can be removed in the solution purification process, However, when the content of these impurities is high, the purification cost will be greatly increased. F. Raw materials with high Cl content will enter the solution during the leaching process and are not easily removed. Long-term use will cause their accumulation in the solution. Therefore, the traditional hydrometallurgy has strict requirements on the content of F, Cl, As, Sb, Co, Ni, Ge, etc. in th...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/26C25C1/16
CPCY02P10/20
Inventor 舒毓璋杨龙
Owner YUNNAN XIANGYUNFEILONG RESOURCES RECYCLING TECH CO LTD
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