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Method for preparing manganese sulfate from leaching slag of electrolytic manganese metal

A technology for electrolysis of metal manganese and leaching of slag, applied in the direction of improving process efficiency, etc., can solve the problems that manganese sulfate is difficult to meet the quality standard of nickel-cobalt-manganese secondary positive electrode material, large equipment investment, and high operation requirements, and achieves significant ecological benefits and Environmental benefits, less equipment investment, and broad application prospects

Active Publication Date: 2011-08-03
CHANGSHA RES INST OF MINING & METALLURGY
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Problems solved by technology

However, the preparation process of this manganese sulfate requires the use of high-pressure equipment such as high-pressure crystallization pots and high-pressure filter pots. The equipment investment is large, the operation requirements are high, and the production cost is high. Moreover, it is difficult for the prepared manganese sulfate to reach the level of the nickel-cobalt-manganese secondary positive electrode. Material Quality Standards

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  • Method for preparing manganese sulfate from leaching slag of electrolytic manganese metal
  • Method for preparing manganese sulfate from leaching slag of electrolytic manganese metal
  • Method for preparing manganese sulfate from leaching slag of electrolytic manganese metal

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Embodiment

[0021] a kind of like figure 1 Shown the present invention prepares the method for manganese sulfate with electrolytic metal manganese leaching slag, comprises the following steps:

[0022] 1. Preparation of manganese carbonate: using the washing solution of electrolytic manganese metal leaching slag in a certain electrolytic manganese process as raw material, after testing, the washing solution contained Mn 37.82g / L, containing (NH 4 ) 2 SO 4 91.82g / L, and then use ammonium bicarbonate to precipitate the washing solution. The amount of ammonium bicarbonate is 1.1 times the theoretical amount. The temperature during precipitation is 40°C, and the stirring time is 30min. After filtration and separation, manganese carbonate precipitation and precipitation residue are obtained. (The precipitation residue mainly contains ammonium sulfate). The reaction principle of this step is:

[0023] MnSO 4 +2NH 4 HCO 3 =MnCO 3 +(NH 4 ) 2 SO 4 +H 2 O+CO 2 ↑.

[0024] 2. Sulfuric ...

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Abstract

The invention discloses a method for preparing manganese sulfate from leaching slag of electrolytic manganese metal, comprising the following steps of: with a washing liquid of the leaching slag of the electrolytic manganese metal as a raw material, settling the washing liquid with carbonate and separating to obtain a manganese carbonate precipitation and a precipitated residual liquid; dissolving the manganese carbonate precipitation with sulfuric acid to obtain a manganese sulfate solution; and multiply purifying the manganese sulfate solution to obtain a pure manganese sulfate solution and evaporating and crystallizing the pure manganese sulfate solution to obtain a high-purity manganese sulfate product. The method disclosed by the invention has the advantages of resource saving, environmental protection, high economic benefit, simple process, low investment cost and the like.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and chemical production, and in particular relates to a preparation method of manganese sulfate. Background technique [0002] At present, the annual production capacity of electrolytic manganese in my country has exceeded 2 million tons, and the actual output is about 1 million tons. It is the largest producer and consumer of electrolytic manganese in the world, and domestic production accounts for 98% of the world's total production. Electrolytic manganese metal is an industry with high material consumption and high energy consumption. The rapid growth of the industry has caused a large consumption of resources on the one hand, and on the other hand, the production of electrolytic manganese metal has also brought great pollution to the environment. The surrounding environment of the electrolytic manganese plant is under pressure. getting bigger. [0003] About 8 tons of manganese carbon...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCY02P10/20
Inventor 李先柏陈一波许彬段兴无徐光前谭岳詹锡松习小明
Owner CHANGSHA RES INST OF MINING & METALLURGY
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