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Method of preparing high-purity nickel sulfate from electrolytic manganese sulfide slag

A technology of sulfide slag and electrolytic manganese, applied in the direction of nickel sulfate, cobalt sulfate, improvement of process efficiency, etc., can solve problems such as complicated process, and achieve the effect of improving separation effect, reducing production cost and reducing acid consumption

Pending Publication Date: 2021-04-16
GUANGXI NORMAL UNIV OF SCI & TECH
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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

Method used

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  • Method of preparing high-purity nickel sulfate from electrolytic manganese sulfide slag

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preparation example Construction

[0043] (7) Preparation of high-purity nickel sulfate: separate nickel sulfate solution, evaporate and concentrate it, crystallize and centrifuge to obtain high-purity nickel 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 of preparing high-purity nickel sulfate from electrolytic manganese sulfide slag. The method comprises the following steps of (1) crushing and sieving; (2) oxidizing and leaching; (3) calcium removal; (4) manganese removal; (5) synchronous extraction of cobalt and nickel: taking a solution rich in cobalt, nickel and magnesium, and adding a third organic extractant formed by mixing saponified neodecanoic acid with sulfonated kerosene for extraction to obtain an organic phase rich in the cobalt and the nickel and a magnesium-contained aqueous phase; (6) cobalt removal: taking the organic phase rich in the cobalt and the nickel, adding dilute sulfuric acid for reverse extraction to obtain a cobalt-nickel sulfuric acid solution and a neodecanoic acid organic phase, separating out the cobalt-nickel sulfuric acid solution, and adding a fourth organic extractant formed by mixing saponified P507-Cyanex301 with sulfonated kerosene for extraction to obtain a cobalt-rich organic phase and a nickel sulfate solution; and (7) preparation of the high-purity nickel sulfate. The method has the advantages that the method is simple and feasible, leaching of nickel sulfate can be realized, and production of hydrogen sulfide gas, use of an iron precipitation process and a method of removing calcium and magnesium ions with precipitation of fluorine ions can be avoided.

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 nickel 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 Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B3/40C22B47/00C01G53/10C01G51/10
CPCY02P10/20
Inventor 叶有明曾军谢雪珍廖政达覃逸明蒋才云蓝峻峰农永萍
Owner GUANGXI NORMAL UNIV OF SCI & TECH
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