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Cobalt removing agent and application thereof

A cobalt removal agent and reaction technology, applied in the field of secondary resource recovery, can solve the problems of decomposition, large dosage, and low overall efficiency, and achieve the effect of high selectivity, strong selectivity, and suitable for large-scale industrialization

Active Publication Date: 2019-04-23
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from the literature that it still has many defects. The first is that the amount is large and can only handle low-cobalt solutions. The amount of zinc added needs to be hundreds of times higher than the content of cobalt.
Another cobalt removal efficiency requires high acidity, the higher the acidity, the better the effect, however high acidity will lead to the decomposition of ziram, so the overall efficiency is not high
[0008] So far, there is no cobalt removal agent with high efficiency and high selectivity, especially suitable for the leaching solution of zinc smelting slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Mix 2mol / L sulfuric acid and zinc smelting slag at a liquid-solid ratio of 5:1, heat and stir for 2 hours, and filter to obtain a leaching solution. Use neutralization hydrolysis and zinc powder replacement to remove iron and cadmium ions respectively, and filter to obtain a pre-cobalt solution . The concentration of zinc in the solution before cobalt removal is 110g / L, the concentration of cobalt is 650mg / L, the concentration of manganese is 2.4g / L, and the pH value is adjusted to 4.5. Add 6g ziram and 0.5g sodium nitrite to the 1L solution, and use 500 React at a stirring rate of rev / min for 2 hours, filter, the cobalt concentration in the filtrate is 1.3mg / L, the manganese concentration is basically unchanged, the cobalt recovery rate is 99.8%, the precipitated residue is pickled and dried, and the cobalt grade is 13.8%. The cobalt precipitate was oxidized and roasted at 600°C for 1 hour, and the cobalt grade in the cobalt slag was 59.4%.

Embodiment 2

[0041] Mix 2mol / L sulfuric acid and zinc smelting slag at a liquid-solid ratio of 5:1, heat and stir for 2 hours, and filter to obtain a leaching solution. Use neutralization hydrolysis and zinc powder replacement to remove iron and cadmium ions respectively, and filter to obtain a pre-cobalt solution . The concentration of zinc in the solution before cobalt removal is 115g / L, the concentration of cobalt is 550mg / L, the concentration of manganese is 2.8g / L, and the pH value is adjusted to 5. Add 5g of ziram and 0.4g of sodium nitrite to 1L of the solution. React at a stirring rate of 500 rpm for 2 hours, filter, the cobalt concentration in the filtrate is 1.5 mg / L, the manganese concentration is basically unchanged, the cobalt recovery rate is 99.7%, the precipitated residue is pickled and dried, and the cobalt taste is 13.5%. The cobalt precipitate was oxidized and roasted at 600°C for 1 hour, and the cobalt grade in the cobalt slag was 58.4%.

Embodiment 3

[0043] Mix 2mol / L sulfuric acid and zinc smelting slag at a liquid-solid ratio of 5:1, heat and stir for 2 hours, and filter to obtain a leaching solution. Use neutralization hydrolysis and zinc powder replacement to remove iron and cadmium ions respectively, and filter to obtain a pre-cobalt solution . The concentration of zinc in the solution before cobalt removal is 108g / L, the concentration of cobalt is 600mg / L, the concentration of manganese is 2.3g / L, and the pH value is adjusted to 5. Add 6g of ziram and 0.4g of sodium nitrite to 1L of the solution. React at a stirring rate of 500 rpm for 1.5 hours, filter, the cobalt concentration in the filtrate is 1 mg / L, the manganese concentration is basically unchanged, the cobalt recovery rate is 99.8%, the precipitated residue is pickled and dried, and the cobalt taste is 13.7%. The cobalt precipitate was oxidized and roasted at 800°C for 1 hour, and the cobalt grade in the cobalt slag was 59.6%.

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PUM

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Abstract

The invention discloses a cobalt removing agent and application thereof. The cobalt removing agent consists of dimethyl dithiocarbamate and sodium nitrite; and the ratio of dimethyl dithiocarbamate tosodium nitrite by mass is 12-18: 1. The cobalt removing agent is applied to zinc smelting slag leaching liquid for cobalt removal; the cobalt removing rate is above 99.7%, that is, cobalt can be nearly removed, so that the concentration of cobalt in solution totally meets the zinc electrolysis requirements, meanwhile, higher selectivity is achieved, and manganese ions achieving an electrolysis protecting effect in the solution cannot be removed; and in addition, the cobalt removing process, the grade of cobalt slag obtained after heat treatment of cobalt precipitates is above 58%, and higherrecovery value is achieved.

Description

technical field [0001] The invention relates to a cobalt removal agent and its application, belonging to the technical field of secondary resource recovery. Background technique [0002] Global zinc consumption exceeds 13 million tons per year, and it is expected that global zinc demand will continue to grow in the future. However, as zinc consumption increases, the content and grade of primary zinc resources are declining. At the same time, the discharge and accumulation of a large amount of smelting waste residues has led to serious waste of resources and prominent environmental problems. Therefore, from the perspective of resource utilization and environmental protection, smelting slag with high zinc content as a secondary resource must be further processed and recycled to promote the sustainable development of the zinc industry in the future. [0003] The zinc smelting waste slag treatment process mainly consists of four basic processes: roasting, leaching, purificatio...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/46C22B3/44C22B23/00
CPCC22B3/44C22B3/46C22B7/007C22B23/0461Y02P10/20
Inventor 杨越孙伟宋绍乐胡岳华雷舒雅王长涛吴美荣陆红羽
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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