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Clean and environment-friendly comprehensive novel recycling process by virtue of high-indium high-iron zinc concentrate

A high-iron zinc and zinc concentrate technology, which is applied in the field of comprehensive recovery of zinc, indium and iron in hydrometallurgical integrated innovative technology, can solve the problem of low direct yield of zinc smelting, difficult recovery of sulfide ore and the consumption of elemental sulfur and zinc concentrate Large and other problems, to achieve the effect of complete separation, efficient separation, and high metal recovery rate

Active Publication Date: 2014-01-22
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing problems: more than 70% of indium and iron in zinc calcine have been leached in the low-acid leaching process, and indium and iron in high-acid leaching slag only account for 15%-20% of the total. This process only solves this part resource utilization of indium and iron; the existing high-acid leaching process directly returns the high-acid leaching solution to low-acid leaching, making full use of the residual 80-100g / L sulfuric acid in the high-acid leaching solution. This process needs to add a large amount of sulfuric acid to the zinc system to meet the The need for zinc leaching
The technology combines hot acid leaching process with Fe 3+ The reduction process is combined, resulting in the mixing of unreacted zinc concentrate and hot acid leaching slag. It is difficult to recover sulfide ore and elemental sulfur by flotation of the mixed slag. At the same time, the consumption of zinc concentrate is large, and the direct recovery rate of zinc smelting is low.

Method used

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  • Clean and environment-friendly comprehensive novel recycling process by virtue of high-indium high-iron zinc concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Main components of zinc calcine hot acid leaching solution (g / L): Zn104.52, In0.15, Fe 总 20.5, H 2 SO 4 51.4, heat up the hot acid leaching solution to 85°C, add zinc concentrate with a particle size below 0.074mm accounting for 90% as a reducing agent, and the amount of reducing agent added is Fe 3+ The theoretical amount is reduced by 1.05 times, and the reduction time is 3 hours. Fe in the hot acid leaching solution after reduction 3+ 1.36g / L, the final acid concentration was 38.2g / L.

[0048] Add limestone to the hot acid leach solution after reduction, the mass of limestone added is 85% of the theoretical amount, the neutralization time is 60min, the neutralization process temperature is controlled at 60°C, the neutralization final acid concentration is 10g / L, and the neutralization slag contains In0. 0011%, In loss is less than 0.15%.

[0049] Add zinc oxide to the solution after neutralization, the mass of zinc oxide added is 120% of the theoretical amount, t...

Embodiment 2

[0053] Main components of zinc calcine hot acid leaching solution (g / L): Zn101.8, In0.18, Fe 总 28.4, H 2 SO 4 45.8, the temperature of the hot acid leaching solution was raised to 95°C, and SO was added 2 As a reducing agent, the amount of reducing agent added is Fe 3+ The theoretical amount is reduced by 1.75 times, and the reduction time is 3 hours. Fe in the hot acid leaching solution after reduction 3+ 1.76g / L, the final acid concentration was 50.2g / L.

[0054] Limestone was added to the hot acid leaching solution after reduction, the mass of limestone added was 70% of the theoretical amount, the neutralization time was 60min, the neutralization process temperature was controlled at 60°C, the neutralization final acid concentration was 15g / L, and the neutralization slag contained In0. 0003%, In loss is less than 0.07%.

[0055] Add zinc powder to the neutralized solution, the mass of zinc powder added is 200% of the theoretical amount, the reaction temperature is 60°C...

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Abstract

The invention discloses a clean and environment-friendly comprehensive recycling method by virtue of high-indium high-iron zinc concentrate, and relates to a method for comprehensively recycling zinc, indium and iron by taking the high-indium high-iron zinc concentrate as a raw material by using a hydrometallurgy method. The method is characterized in that in a comprehensive recycling process, Fe3+ in a zinc calcine thermal acid leaching liquid is reduced into Fe2+ by using a reducing agent, In / Fe is separated in two-stage process, indium is further recycled from high-indium slag, iron is removed from liquid by a hematite process after In / Fe is separated, iron slag which can be utilized as iron concentrate can be obtained, and the liquid after iron is removed is fed back to subject to neutral leaching. The method disclosed by the invention is simple and short in procedure, thorough in separation of zinc, indium and iron metals, high in metal recycling rate and environment-friendly, and resource utilization of iron slag is achieved.

Description

technical field [0001] A new process for the comprehensive recovery of high-indium and high-iron-zinc concentrates relates to a method for comprehensively recovering zinc, indium and iron by using high-indium and high-iron-zinc concentrates as raw materials and adopting hydrometallurgical integrated innovative technologies. Background technique [0002] At present, the main processes of zinc smelting in my country are traditional hydrometallurgy process and pressure leaching process. The main process of the traditional zinc hydrometallurgy process is roasting-leaching-purification-electrodeposition. According to the different zinc leaching slag treatment processes, the traditional zinc hydrometallurgy process is divided into rotary kiln volatilization method (commonly known as conventional method) and hot acid leaching process ( According to different principles of iron removal, it is divided into jarosite method, goethite method and hematite method). [0003] Conventional ...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B19/20C22B58/00C01G49/06
CPCY02P10/20
Inventor 蒋开喜张邦胜王海北赵磊蒋训雄刘三平蒋伟邹小平张磊王玉芳汪胜东林江顺范艳青魏帮冯亚平黄胜
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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