Zinc hydrometallurgy production process

A production process, a technology of hydrometallurgy, applied in the field of hydrometallurgy, can solve the problems of high production cost, low zinc leaching rate, unfavorable environmental protection, etc., and achieve the effects of low production cost, high iron removal rate and small zinc loss

Inactive Publication Date: 2013-01-16
广西华锡集团股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned various wet zinc smelting iron removal processes can be classified into two categories: one is the pyrolysis leaching slag process represented by the conventional method, which is characterized by a waste slag (containing iron) The solidified slag is discharged, and the waste slag is convenient for storage and sales, which is beneficial to environmental protection, but the zinc leaching rate is low, and a rotary kiln is required to process the leaching slag to recover zinc oxide, which consumes a lot of energy and low concentration of SO 2 Flue gas needs to ...

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  • Zinc hydrometallurgy production process

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 The zinc concentrate is roasted to obtain calcined sand and flue gas, and the calcined sand is subjected to neutral leaching, the temperature is controlled at 40°C, and the pH at the end point is 4.8. After separation, the middle leaching supernatant and the middle leaching underflow are obtained. The clear liquid is leaching the zinc sulfate solution. Hot acid leaching is carried out on the middle leaching bottom flow, and waste electrolyte is added to further leach insoluble zinc with zinc ferrite as the main form under high temperature and high acid, and then reduction leaching is carried out, and excessive zinc sulfide concentrate is added to make the Fe in the solution 3+ reduced to Fe 2+ , the temperature is controlled at 85°C, and the final acid is 45g / l. After separation, the reduction leaching supernatant and underflow slag are obtained. The underflow slag is sent to flotation to obtain sulfur concentrate and tailings. Sulfur concentrate and zinc conc...

Embodiment 2

[0020] Example 2 The zinc concentrate is roasted to obtain calcined sand and flue gas. The calcined sand is subjected to neutral leaching, the temperature is controlled at 45°C, and the pH at the end point is 4.9. The clear liquid is leaching the zinc sulfate solution. Hot acid leaching is carried out on the middle leaching bottom flow, and waste electrolyte is added to further leach insoluble zinc with zinc ferrite as the main form under high temperature and high acid, and then reduction leaching is carried out, and excessive zinc sulfide concentrate is added to make the Fe in the solution 3+ reduced to Fe 2+ , the temperature is controlled at 87°C, and the final acid is 48g / l. After separation, the reduction leaching supernatant and underflow slag are obtained. The underflow slag is sent to flotation to obtain sulfur concentrate and tailings. Sulfur concentrate and zinc concentrate are roasted together to obtain roasted Sand and calcined sand are used for neutral leaching, ...

Embodiment 3

[0021] Example 3 The zinc concentrate is roasted to obtain calcined sand and flue gas. The calcined sand is subjected to neutral leaching, the temperature is controlled at 48°C, and the pH at the end point is 5.0. The clear liquid is leaching the zinc sulfate solution. Hot acid leaching is carried out on the middle leaching bottom flow, and waste electrolyte is added to further leach insoluble zinc with zinc ferrite as the main form under high temperature and high acid, and then reduction leaching is carried out, and excessive zinc sulfide concentrate is added to make the Fe in the solution 3+reduced to Fe 2+ , the temperature is controlled at 90°C, and the final acid is 50g / l. After separation, the reduction leaching supernatant and underflow slag are obtained. The underflow slag is sent to flotation to obtain sulfur concentrate and tailings. Sulfur concentrate and zinc concentrate are roasted together to obtain roasted Sand and calcined sand are used for neutral leaching, a...

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Abstract

The invention relates to a zinc hydrometallurgy production process. According to the zinc hydrometallurgy production process provided by the invention, reduction leached supernate is subjected to preneutralization, then zinc dust is added for replacing indium, after the indium is separately removed, oxygen with the concentration being not lower than 98 percent is filled into liquid obtained after the indium is deposited, controlling the temperature in the range of 160 to 200 DEG C and controlling the pressure in the range of 1,000 to 2,000kPa, so that iron precipitates in the liquid obtained after the indium is deposited enter slags. The iron removed liquid obtained by the zinc hydrometallurgy production process has the iron content being lower than 1.2g/l, the iron removed liquid can be directly returned to be subjected to neutral leaching, and the system has stable production working conditions and is beneficial to stable production; in the iron slags obtained by the zinc hydrometallurgy production process, the zinc content is lower than 1 percent, the zinc loss is low and the zinc recovery rate is high; the iron slags can be directly sold to a cement plant and an iron and steel plant to be used as the raw materials without being stacked in a slag field, so that the zinc hydrometallurgy production process is beneficial to environmental-protection and the comprehensive utilization of resources and mineral resources are saved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a zinc hydrometallurgy production process. Background technique [0002] Iron removal is an important subject of wet zinc smelting. The processes of roasting, leaching, purification, electrowinning and melting and casting in wet zinc smelting are basically the same. The main difference is that different methods of iron removal are used, resulting in different wet zinc. Smelting process: 1. Conventional method. After the zinc concentrate is roasted, neutral leaching and low acid leaching are used. The zinc leaching rate is about 70%, the slag rate is about 60%, and the iron remains in the leaching slag. This method is due to the leaching slag containing Zinc is high. Generally, rotary kiln is used to volatilize and recover zinc oxide, and iron is removed by kiln slag. The kiln slag contains about 1-2% zinc and 25-30% iron. The iron slag produced by this method ...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B3/20C22B7/00C22B19/00
CPCY02P10/20
Inventor 梁敏炎文丕忠廖春图王学洪徐林建陈光耀陶政修刘俊兰李显华蒋光佑舒见义张成松左小红陈阜东蒋国林徐静阳伦庄董鹏王兴何醒民
Owner 广西华锡集团股份有限公司
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