A method for preparing high-purity cobalt sulfate from electrolytic manganese sulfide slag

A technology of sulfide slag and electrolytic manganese, applied in the direction of cobalt sulfate, process efficiency improvement, etc., can solve problems such as cumbersome process, achieve the effects of simplifying process flow, reducing acid consumption, and improving safety

Active Publication Date: 2021-07-27
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this invention is: after adopting the complex technological process, only the enriched slag containing cobalt and nickel is obtained, and the utilization of the enriched slag rich in cobalt and nickel needs further leaching-extraction process, resulting in cumbersome process
The disadvantage of this invention is that after the manganese-containing cobalt-nickel waste residue is leached, it is necessary to further use the oxidation precipitation method to remove impurities from iron and aluminum

Method used

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  • A method for preparing high-purity cobalt sulfate from electrolytic manganese sulfide slag

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preparation example Construction

[0043] (7) Preparation of high-purity cobalt sulfate: separate high-purity rich-loaded cobalt sulfate solution, evaporate and concentrate it, crystallize, and centrifuge to obtain high-purity cobalt sulfate.

[0044] The composition detection of the electrolytic manganese sulfide slag adopted in the present invention is as shown in table 1:

[0045] Table 1

[0046] w Mn / ％

[0047] According to the above method for preparing high-purity cobalt sulfate, implement the following examples.

Embodiment 1

[0049] Crush and sieve 10g of electrolytic manganese sulfide slag and 17g of pyrolusite to 200 mesh, mix well, add 90g / L sulfuric acid solution according to the liquid-solid ratio of 10:1, feed oxygen 0.1Mpa, heat to 90°C, mechanically stir, and leaching 180min, the measured end point pH=3.0, filter, the leaching solution is adjusted to pH=0.5 with dilute sulfuric acid, and 30% P204+70% sulfonated kerosene is used to remove calcium according to the ratio O / A=1:1, wherein the saponification rate of the extractant is 20 %, extract for 10min, and then separate the liquid in a separating funnel to obtain a manganese-rich cobalt-nickel-magnesium solution after decalcification, then use sodium hydroxide to adjust the pH of the manganese-cobalt-nickel-magnesium solution to 3.5, and use 30% P204+70% sulfonation Kerosene is demanganese-rich manganese-cobalt-nickel-magnesium solution by ratio O / A=2:1, and wherein extractant saponification rate is 40%, extracts 10min, obtains loaded manga...

Embodiment 2

[0051] Crush and sieve 10g of electrolytic manganese sulfide slag and 17g of pyrolusite to 200 mesh, mix well, add 90g / L sulfuric acid solution according to the liquid-solid ratio of 10:1, feed oxygen 0.2Mpa, heat to 90°C, mechanically stir, and leaching 180min, the measured end point pH=3.0, filtered, the leachate was adjusted to pH=1 with dilute sulfuric acid, and 20% P204+80% sulfonated kerosene was used to remove calcium according to the ratio O / A=1:1, wherein the saponification rate of the extractant was 30 %, extract 10min, and then separate liquids in a separating funnel to obtain a calcium-removing manganese-rich cobalt-nickel-magnesium solution, then use dilute sulfuric acid to adjust the pH of the water phase to 4.0, and use 30% P204+70% sulfonated kerosene according to O / A=2.5:1 manganese removal, wherein the saponification rate of the extractant is 30%, extract for 10min, obtain the loaded manganese organic phase, then use 150g / L sulfuric acid to extract the loaded...

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Abstract

The invention discloses a method for preparing high-purity cobalt sulfate from electrolytic manganese sulfide slag, which is carried out according to the following steps: (1) crushing and sieving; (2) oxidation leaching; (3) calcium removal; (4) manganese removal; 5) Synchronous extraction of cobalt and nickel; (6) Recovery of cobalt: take cobalt-nickel-rich organic phase, add dilute sulfuric acid for back extraction, and obtain cobalt-nickel sulfuric acid solution and neodecanoic acid organic phase; separate cobalt-nickel sulfuric acid solution, add saponification P507-Cyanex301 mixed with sulfonated kerosene to form the fourth organic extractant extraction, to obtain cobalt-rich organic phase and nickel sulfate solution; separate the cobalt-rich organic phase, add sulfuric acid for back extraction, to obtain high-purity rich cobalt sulfate solution and P507- Cyanex301 organic phase; (7) Preparation of high-purity cobalt sulfate. The invention has the advantages of being simple and feasible, realizing the leaching of cobalt sulfate, avoiding the generation of hydrogen sulfide gas, the use of iron-precipitating process and the method of fluoride ion precipitation for removing calcium and magnesium ions.

Description

technical field [0001] The invention belongs to the fields of hydrometallurgy and clean metallurgy, and in particular relates to a method for preparing high-purity cobalt sulfate from electrolytic manganese sulfide slag. Background technique [0002] Cobalt is an important industrial raw material. Electrolysis is a common method for producing manganese. The basic steps are: leaching manganese ore to obtain manganese-containing leachate, then neutralizing and removing iron, vulcanizing agent to remove heavy metals, and finally electrolyzing to obtain electrolytic manganese. In addition to heavy metals, a large amount of cobalt will also be precipitated in the form of cobalt sulfide, resulting in the loss of cobalt, so it is of great significance to recover the cobalt therein. At present, the treatment method of electrolytic manganese sulfide slag often adopts direct leaching with sulfuric acid, which is easy to generate toxic hydrogen sulfide gas. After leaching, the liquid i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B23/00C22B3/38C22B3/08C01G51/10
CPCY02P10/20
Inventor 曾军陈进中叶有明蔡井泉
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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