A method for recovering manganese dioxide from electrolytic manganese anode slime

A technology of manganese dioxide and anode slime, applied in the direction of improving process efficiency, etc., can solve the problems of waste of resources, complex components, low activity, etc., and achieve the effect of increasing the reaction area, simple reaction, and improving electrical conductivity

Active Publication Date: 2018-01-02
GUANGXI GUILIU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of manganese dioxide in electrolytic manganese anode slime accounts for about 50%-70%. Due to its complex composition and low activity, except for a small amount of manganese ore leachate used in electrolytic manganese plants to remove iron, most of the anode slime is sold cheaply or piled up, resulting in waste of resources and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for recovering manganese dioxide from electrolytic manganese anode slime includes the following steps:

[0027] (1) Calcination: The electrolytic manganese anode slime is dried and crushed into powder, mixed with the carbon powder at a mass ratio of 2.6:1, and calcined at 450°C for 20 minutes to obtain a gray-green powder;

[0028] (2) Acid soluble: soak the gray-green powder in 6 mol / L sulfuric acid for 12 minutes, and stir every 3 minutes. After the reaction is complete, add lime milk to adjust the pH to 5.0, filter to obtain the filtrate, and add sulfide to the filtrate while stirring Sodium, until no more precipitation, filter with suction to obtain a second filtrate;

[0029] (3) Crystallization: Concentrate the second filtrate in vacuum at room temperature. When crystals precipitate in the filtrate, cool the filtrate to 4℃ to precipitate sodium sulfate crystals, filter, and add manganese sulfate in the amount of 0.3 g / 100 ml to the remaining filtrate The seed c...

Embodiment 2

[0032] (1) Calcination: The electrolytic manganese anode slime is dried and crushed into powder, mixed with carbon powder at a mass ratio of 2.2:1, and calcined at 600°C for 15 minutes to obtain gray-green powder;

[0033] (2) Acid soluble: soak the gray-green powder in 8 mol / L sulfuric acid for 10 minutes, and stir every 5 minutes. After the reaction is complete, add lime milk to adjust the pH to 4.5, filter to obtain the filtrate, and add sulfide to the filtrate while stirring Sodium, until no more precipitation, filter with suction to obtain a second filtrate;

[0034] (3) Crystallization: Concentrate the second filtrate in vacuum at room temperature. When crystals precipitate in the filtrate, cool the filtrate to 5°C to precipitate sodium sulfate crystals, filter, and add manganese sulfate in the amount of 0.1 g / 100 ml to the remaining filtrate The seed crystals are continuously concentrated in vacuum at room temperature to precipitate a large amount of manganese sulfate crysta...

Embodiment 3

[0037] (1) Calcination: The electrolytic manganese anode slime is dried and crushed into powder, mixed with carbon powder at a mass ratio of 3:1, and calcined at 300°C for 30 minutes to obtain a gray-green powder;

[0038] (2) Acid soluble: soak the gray-green powder in 5 mol / L sulfuric acid for 15 minutes, and stir every 2 minutes. After the reaction is complete, add lime milk to adjust the pH to 5.5, filter to obtain the filtrate, and add sulfide to the filtrate while stirring Sodium, until no more precipitation, filter with suction to obtain a second filtrate;

[0039] (3) Crystallization: Concentrate the second filtrate in vacuum at room temperature. When crystals precipitate in the filtrate, cool the filtrate to 2°C to precipitate sodium sulfate crystals, filter, and add manganese sulfate in the amount of 0.5 g / 100 ml to the remaining filtrate The seed crystals are continuously concentrated in vacuum at room temperature to precipitate a large amount of manganese sulfate crysta...

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PUM

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Abstract

The invention discloses a method for recycling manganese dioxide from electrolytic manganese anode mud. The method comprises the following steps: drying and crushing the electrolytic manganese anode mud into powder; adding reducing carbon powder into the powder to roast to obtain grey-green powder of which the main component is manganese oxide; dissolving the grey-green powder by use of sulfuric acid to obtain a manganese sulfate solution; and enabling the manganese sulfate and potassium permanganate to generate redox reaction in an acidic condition to obtain nano manganese dioxide. According to the method, a manganese element in the electrolytic manganese anode mud is recycled and prepared into the nano manganese dioxide, so that the resource reuse problem of the electrolytic manganese anode mud is solved, heavy metal pollution is avoided, and resources are saved.

Description

Technical field [0001] The invention belongs to the technical field of electrolytic manganese anode mud resource reuse, and specifically relates to a method for recovering manganese dioxide from electrolytic manganese anode mud. Background technique [0002] Due to the diversity of its structure and its unique physical and chemical properties, as well as its low price and environmental friendliness, manganese dioxide material is an important electrode material, widely used in dry batteries, alkaline manganese batteries, zinc manganese batteries, magnesium manganese batteries, In chemical power sources such as buried manganese batteries, as a multi-functional fine inorganic functional material, it can be used as molecular sieves and advanced catalyst materials. As an amphoteric transition metal oxide, it has a wide range of applications in industrial production and environmental treatment, such as the adsorption and degradation of organic pollutants, and the treatment of heavy met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B3/08C22B47/00
CPCC22B1/02C22B3/08C22B7/007C22B47/00Y02P10/20
Inventor 覃胜先陈建强许雄新罗驰飞吴元花
Owner GUANGXI GUILIU CHEM CO LTD
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