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Improved process for recovering zinc from zinc-containing feedstock

A raw material, zinc-rich technology, applied in the direction of improving process efficiency, can solve problems such as high infrastructure costs, achieve the effect of optimizing capital and operating expenses, and optimizing the requirements of fire protection components

Pending Publication Date: 2022-05-27
TECH REUNIDAS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should also be expected that these processes do not involve higher costs for the necessary infrastructure in the plants used to implement them

Method used

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  • Improved process for recovering zinc from zinc-containing feedstock
  • Improved process for recovering zinc from zinc-containing feedstock
  • Improved process for recovering zinc from zinc-containing feedstock

Examples

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Embodiment 1

[0163] Example 1. Recovery of ultrapure zinc according to the method of the present invention

[0164] The invention will be better understood by the examples in which the improved method according to the invention is described and the results compared to the previous method as defined in EP1361296. figure 1 and figure 2 Also used as a support to understand the different steps and flows resulting from the method described in this example, where all operating elements are denoted by capital letters.

[0165] This example relates to the production of Special High Grade zinc from secondary zinc-containing materials using the following operating units:

[0166] - Raw material leaching to convert zinc from solid to liquid

[0167] - Extraction of Zn from aqueous solution into organic extractant (D2EHPA)

[0168] - The zinc is stripped from the extractant using an acidic treatment, so the organic solution can be recycled back into the extraction

[0169] - SHG Zn production usi...

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Abstract

The invention relates to an improved process for recovering zinc from a primary feedstock and a secondary feedstock, said process comprising a first leaching step wherein a ratio between the weight of zinc in the feedstock and the volume of the leach liquor is comprised of at least 20 kg zinc / m3 of an acidic aqueous solution; a neutralization step; and a solvent extraction stage in the presence of an organic extractant, wherein the temperature is maintained at 47 DEG C to 52 DEG C.

Description

technical field [0001] The present invention relates to the field of zinc recovery methods, and more particularly to hydrometallurgical processing using different zinc primary and / or secondary feedstocks allowing to obtain electrolytic zinc or high purity zinc compounds. Background technique [0002] Processes using various primary or secondary zinc sources as raw materials have been known for decades. Most of them are based on hydrometallurgical processing, the main purpose of which is to obtain zinc or its salts with high purity. [0003] The first method involves the roasting of the primary raw material (zinc sulfide concentrate), by which impure zinc oxide is obtained. It was then subjected to a leaching step with sulfuric acid, thereby producing an aqueous zinc-containing solution still containing high levels of impurities, which was purified by displacing the precipitation with zinc powder. The purified solution is sent to an electrolytic extraction step to produce m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/06C22B3/08C22B3/10C22B3/38
CPCC22B19/22C22B3/06C22B3/065C22B3/08C22B3/10C22B3/26Y02P10/20C22B3/3846C22B3/44
Inventor 安娜·贝伦·梅希亚斯科尔德罗埃米利奥·佩查罗曼梅尔卡多马里亚·弗拉德斯塔皮亚塞尔希奥·桑吉琳达索兰
Owner TECH REUNIDAS SA
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