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Method for leaching zinc concentrate with high iron

A zinc concentrate and leaching technology, which is applied in the field of zinc extraction from low-grade zinc concentrate, can solve the problems of large amount of slag, difficult separation of lead and silver, and high disposal cost

Inactive Publication Date: 2019-10-11
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iron precipitates into the slag. Although the iron removal process is simplified, the iron is mainly precipitated in the form of iron and vanadium, and only a small part is hematite, resulting in a large amount of slag, which is difficult to separate from lead and silver. The slag belongs to the category of hazardous waste. Enterprises have used Kifset furnace or Ausmelt furnace for treatment, but the disposal cost is high
Especially in the two-stage countercurrent leaching process, iron precipitates into the slag in the first stage, and leaches into the solution in the second stage under high temperature and high acid conditions, resulting in the circulation of iron in the system and the consumption of oxygen

Method used

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  • Method for leaching zinc concentrate with high iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Composition of zinc concentrate for leaching (%): Zn47.92, Fe12.32, S31.83.

[0033] The pressure leaching conditions are as follows: zinc concentrate is ball milled until more than 90% of the zinc concentrate has a particle size of 45 μm or less, weighs 100g, slurry liquid-solid ratio is 5:1, initial iron ion concentration is 10g / L, and initial sulfuric acid concentration is 180g / L. The temperature is 100°C, and the leaching time is 5h. The leaching slag rate is 43.8%, the zinc leaching rate is 96.43%, and the iron leaching rate is 63.24%.

Embodiment 2

[0035] Zinc concentrate composition (%) for leaching: Zn47.41, Fe7.97, S27.93.

[0036] The pressure leaching conditions are as follows: zinc concentrate is ball milled until more than 90% of the zinc concentrate has a particle size of 45 μm or less, weighs 100g, slurry liquid-solid ratio is 5:1, initial iron ion concentration is 5g / L, initial sulfuric acid concentration is 180g / L, and leaching The temperature is 100°C, the leaching time is 5h, and the oxygen partial pressure is 300kPa. The leaching slag rate is 44.58%, the zinc leaching rate is 96.29%, and the iron leaching rate is 72.20%.

Embodiment 3

[0038] Composition of zinc concentrate for leaching (%): Zn39.52, Fe14.36, S29.03.

[0039] The pressure leaching conditions are as follows: zinc concentrate is ball milled until more than 90% of the zinc concentrate has a particle size of 45 μm or less, weighs 100g, the slurry liquid-solid ratio is 4:1, the initial iron ion concentration is 5g / L, and the initial sulfuric acid concentration is 180g / L. The temperature is 110°C, the leaching time is 4h, and the oxygen partial pressure is 300kPa. The zinc leaching rate is 95.87%, and the iron leaching rate is 61.32%.

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Abstract

The invention discloses a method for leaching zinc concentrate with high iron, and belongs to the technical field of zinc smelting. The method comprises the steps: after the zinc concentrate is finelyground, carrying out slurrying and leaching by using a solution containing sulfuric acid and ferric (ferrous) sulfate, and controlling the solid ratio of the leaching solution to be 2-8: 1, the initial iron ion concentration to be 2-50 g / L, the initial sulfuric acid concentration to be 20-200 g / L, the oxygen partial pressure to be 100-600 kPa, and the reaction temperature to be 80-130 DEG C; controlling the initial sulfuric acid concentration and the oxygen partial pressure to enable zinc in the concentrate and iron in non-pyrite to leach into a solution at the same time, after the leach solution is neutralized, removing iron by adopting a goethite method or a hematite method to obtain high-grade iron slag; and carrying out flotation hot filtration on the leach slag to recover sulfur, andrecovering lead-silver slag. The zinc is efficiently leached at a lower temperature by utilizing the catalytic action of iron ions, meanwhile, the leaching of iron from non-pyrite in zinc concentrateis controlled to enter the solution, so that the zinc and the iron are separated from lead-silver and the sulfur, the iron is produced in the form of separate iron slag, the grade of the sulfur and the lead-silver slag is effectively improved, and the comprehensive utilization of resources is achieved.

Description

technical field [0001] The invention belongs to the technical field of zinc smelting, and relates to a method for extracting zinc from zinc concentrate, low-grade complex ore such as copper-zinc mixed ore, copper-lead-zinc mixed ore, or low-grade zinc concentrate. Background technique [0002] Aiming at the problem of a large amount of sulfur dioxide produced in the traditional zinc smelting process, in the 1950s Sherritt proposed a zinc concentrate pressure leaching technology. The zinc sulfide concentrate is directly leached, and sulfur enters the leaching slag in the form of sulfur, which has metal synthesis. It has the advantages of high recovery rate, fast reaction rate, and no sulfur dioxide produced during the process, which effectively solves the problems of sulfuric acid storage, sales, and transportation. In 1981, the Trail Plant in Canada was first applied in industry, using one-stage pressure leaching to treat zinc concentrate and combining it with traditional te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/08C22B3/44C25C1/16C01B17/06
CPCC01B17/06C22B3/08C22B3/44C22B19/22C22B19/26C25C1/16Y02P10/20
Inventor 王玉芳刘三平王海北周起帆郑朝振秦树辰邓超群
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD