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A method for preparing nano manganese dioxide from waste batteries

A nano-manganese dioxide and waste battery technology, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of insufficient utilization of useful components in waste batteries, few methods of recycling manganese, and no solution to heavy metal pollution. , to avoid heavy metal pollution, the preparation method is simple, easy to operate, and easy to control

Active Publication Date: 2017-10-13
GUANGXI GUILIU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of incineration and landfilling, attention should be paid to the protection of the environment. Landfilling can easily cause groundwater pollution, while incineration can easily cause air pollution.
These processes make the useful components in the used batteries less than fully utilized, resulting in waste
Although it has been reported that waste batteries are harmless now, they only eliminate mercury in the battery manufacturing process and do not solve the pollution problem of other heavy metals.
There are many manganese elements in the battery, but there are not many ways to recycle the manganese element in the battery at present, resulting in a great waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing nano-manganese dioxide from waste batteries, comprising the steps of:

[0027] (1) Calcination: crush the waste batteries and sieve them, collect the black manganese-containing mixture, mix the manganese-containing mixture and carbon powder at a mass ratio of 2.6:1, and calcinate at 450°C for 20 minutes to obtain gray-green powder;

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

[0029] (3) Crystallization: Concentrate the secondary filtrate in vacuum at room temperature. When crystals are precipitated in the filtrate, cool the filtrate to 4°C to precipitate sodium sulfate crystals, filter, and add manganese sulfate in an amoun...

Embodiment 2

[0032] (1) Calcination: crush the waste batteries and sieve them, collect the black manganese-containing mixture, stir the manganese-containing mixture and carbon powder at a mass ratio of 2.2:1, and calcinate 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, stir once every 5 minutes, add milk of lime after the reaction is complete, adjust the pH to 4.5, filter to obtain the filtrate, add sulfuration to the filtrate while stirring Sodium, until no more precipitation occurs, suction filtration to obtain the secondary filtrate;

[0034] (3) Crystallization: Concentrate the secondary filtrate in vacuum at room temperature. When crystals are precipitated in the filtrate, cool the filtrate to 5°C to precipitate sodium sulfate crystals, filter, and add manganese sulfate in an amount of 0.1 g / 100 ml to the remaining filtrate Seed, continue vacuum concentration at normal temperature, a l...

Embodiment 3

[0037] (1) Calcination: crush the waste batteries and sieve them, collect the black manganese-containing mixture, stir the manganese-containing mixture and carbon powder at a mass ratio of 3:1, and calcinate at 300°C for 30 minutes to obtain gray-green powder;

[0038] (2) Acid-soluble: Soak the gray-green powder in 5 mol / L sulfuric acid for 15 minutes, stir once every 2 minutes, add milk of lime after the reaction is complete, adjust the pH to 5.5, filter to obtain the filtrate, add sulfuration to the filtrate while stirring Sodium, until no more precipitation occurs, suction filtration to obtain the secondary filtrate;

[0039] (3) Crystallization: Concentrate the secondary filtrate in vacuum at room temperature. When crystals are precipitated in the filtrate, cool the filtrate to 2°C to precipitate sodium sulfate crystals, filter, and add manganese sulfate in an amount of 0.5 g / 100 ml to the remaining filtrate Seed, continue vacuum concentration at normal temperature, a lar...

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Abstract

The invention relates to a method for preparing nanometer manganese dioxide by taking waste batteries as raw material. The method comprises the following steps: firstly crushing and screening the waste batteries to obtain black manganese-containing mixture, adding reductive carbon powder and calcinating to obtain grey-green powder the main component of which is manganese oxide, dissolving with sulfuric acid to obtain manganese sulfate solution, and performing redox reaction to manganese sulfate and potassium permanganate under acidic conditions to obtain the nanometer manganese dioxide. The nanometer manganese dioxide is prepared by recovering manganese element of the waste batteries, so that the recycling problem of the waste batteries is solved, the heavy metal pollution of the waste batteries can be avoided, and the resources can be saved.

Description

technical field [0001] The invention belongs to the field of preparation of manganese dioxide nanometer materials, and in particular relates to a method for preparing nanometer manganese dioxide by using waste batteries as raw materials. Background technique [0002] Manganese dioxide material is 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 multifunctional fine inorganic functional material, it can be applied as molecular sieves, advanced catalyst materials, etc. As an amphoteric transition metal oxide, it is widely used in industrial production and environmental treatment, such as the adsorption and degradation of organic pollutants, and the treatment of heavy metal wastewater containing mercury, mercury, lead, chromium, and metalloid arsenic. Application prospect. In particular, nano-manganese dioxide has many unique properties, such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02
CPCC01G45/02
Inventor 陈建强许雄新罗驰飞覃胜先吴元花
Owner GUANGXI GUILIU CHEM CO LTD
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