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Treatment process for recycling of nickel-cobalt hydrometallurgical waste residues

A technology for wet smelting and treatment process, applied in the field of treatment technology for recycling nickel-cobalt wet smelting waste residue, can solve the problems of high investment cost, environmental protection risks and high content of heavy metals, and achieves reduction of environmental pollution, acid consumption and The effect of sulfur dioxide consumption and improving sulfur utilization rate

Active Publication Date: 2021-07-16
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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  • Application Information

AI Technical Summary

Problems solved by technology

This process method also has the problem of high investment cost, high heavy metal content, and environmental risks

Method used

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  • Treatment process for recycling of nickel-cobalt hydrometallurgical waste residues

Examples

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Effect test

Embodiment 1

[0033] A process for recycling nickel-cobalt hydrometallurgy waste slag, the specific steps are as follows:

[0034] (1) Add cobalt hydrometallurgy waste slag to additive coke powder for mixing; cobalt hydrometallurgy waste slag contains 4.62% sulfur, 27% iron, 0.19% cobalt, and 30wt% coke powder.

[0035] (2) Form a reducing atmosphere at 1200-1250°C in the high-temperature reaction zone of the additive in step (1) in the rotary kiln, so that the iron oxide in the cobalt hydrometallurgy waste residue undergoes a reduction reaction, and the reduction produces iron and four Ferric oxide; the cobalt in the cobalt wet smelting waste slag undergoes double salt decomposition and reduction reaction to form cobalt element and cobalt oxide, and after water quenching and magnetic separation to obtain iron and cobalt iron concentrate, cobalt in iron concentrate Enrichment; sulfate decomposition and reduction reactions occur, and sulfur oxides are precipitated and enter the desulfurizati...

Embodiment 2

[0039] A treatment process for recycling nickel hydrometallurgy waste slag, the specific steps are as follows:

[0040] (1) The nickel hydrometallurgy waste slag was mixed with additive coke powder; the sulfur content of the nickel hydrometallurgy waste slag was 3.98%, the iron content was 30%, the nickel content was 0.21%, and the coke powder addition amount was 35wt%.

[0041](2) The high-temperature reaction zone of the additive in step (1) in the rotary kiln forms a certain reducing atmosphere at 1150 ° C ~ 1200 ° C, so that the iron oxide in the nickel hydrometallurgy waste residue undergoes a reduction reaction, and the reduction produces iron elemental and ferroferric oxide; the nickel in the nickel hydrometallurgy waste slag undergoes double salt decomposition and reduction reaction to form nickel elemental and nickel oxide, and after water quenching and magnetic separation to obtain iron-nickel iron concentrate, nickel in iron Enrichment in the concentrate; decomposit...

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Abstract

The invention discloses a treatment process for recycling of nickel-cobalt hydrometallurgical waste residues. The treatment process comprises the following steps that an additive with reducibility and flammability is added into the nickel-cobalt hydrometallurgical waste residues to achieve mixing, the additive forms a reducing atmosphere in a high-temperature reaction zone in a rotary kiln, and iron oxide in the nickel-cobalt hydrometallurgical waste residues is subjected to the reduction reaction; cobalt and nickel in the nickel-cobalt hydrometallurgical waste residues are subjected to double salt decomposition and the reduction reaction to form cobalt-nickel elementary substances and cobalt-nickel oxide, and iron ore concentrates are obtained through water quenching cooling and magnetic separation; and sulfate is subjected to the decomposition reaction and the reduction reaction, and separated sulfur oxide enters a desulfurization system along with flue gas. According to the process method, the treatment problem of the nickel-cobalt hydrometallurgical waste residues is solved, valuable iron ore concentrates with cobalt and nickel enriched are recycled, and iron residue recycling and beneficial environmental protection are achieved; and nickel salt or cobalt salt generated by an original system is used as a desulfurizing agent, the desulfurization cost is reduced, and meanwhile consumption of auxiliary materials in the nickel salt or cobalt salt leaching process is reduced.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a process for recycling nickel-cobalt hydrometallurgy waste slag. Background technique [0002] Most of the existing nickel-cobalt ores adopt the acid leaching wet process. Because the grade of mineral Ni (Co) is generally low, a large amount of waste residue will be produced every year in the process of wet smelting. A large amount of waste residue is mainly stored in tailings ponds or reclamation. After a long time, the soluble harmful substances in the waste residue will dissolve, enter the soil and flow into rivers, causing serious environmental pollution. [0003] The nickel-cobalt hydrometallurgy waste slag produced during the acid leaching wet process has a high iron content and a high sulfur content. How to economically and effectively desulfurize and recover iron, so that the waste slag can be used as resources, is still an environmental protection problem fac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/02C22B5/10B01D53/78B01D53/50
CPCC22B7/001C22B23/023C22B5/10B01D53/78B01D53/50B01D2258/0283Y02P10/20
Inventor 胡雷杨亚刚刘婷娇熊家任王浬周勤俭
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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