Method for preparing powdery electrolytic manganese dioxide (EMD)

An electrolytic manganese dioxide, powdered technology, applied in the electrolysis process, electrolysis components and other directions, can solve the problems of difficult control of product quality, particle size and morphology, difficult removal of sulfate ions, affecting material properties, etc. The effect of low and low raw material requirements

Active Publication Date: 2013-07-10
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] With the vigorous development of the electronics industry, the demand for EMD in the battery industry has gradually increased. At present, the production of EMD in various countries mainly adopts high-temperature electrolysis, and the powdery electrolytic manganese dioxide is obtained by stripping the plate-shaped manganese dioxide from the electrolytic anode plate. Manganese is produced after crushing, rinsing, neutralization, drying and other treatments. Its disadvantages are that the product quality (such as particle size and shape) is difficult to control, the product is dense, the particle size is large, and the particles are uneven. The sodium ions mixed in the electrolysis process, Sulfate ions are difficult to remove, which affects its material properties. At the same time, there are disadvantages such as long production process and complicated process.

Method used

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  • Method for preparing powdery electrolytic manganese dioxide (EMD)
  • Method for preparing powdery electrolytic manganese dioxide (EMD)
  • Method for preparing powdery electrolytic manganese dioxide (EMD)

Examples

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Effect test

Embodiment 1

[0031] Before electrolysis, treat the anode plate with acid to activate its surface: prepare a sulfuric acid solution with a concentration of 0.1mol / L, use a lead-silver alloy plate for the anode, and a graphite plate for the cathode, place the anode and cathode plates in the acid solution, / m 2 Electrolyze at room temperature for 5 minutes at a current density of 100%; lightly polish the anode plate after electrolysis with fine sandpaper to make its surface smooth.

[0032] Weigh 17g of chemically pure manganese sulfate and 75g of concentrated sulfuric acid, dissolve them in 250mL of water, add polyethylene glycol accounting for 0.01% of the mass of manganese sulfate as an active agent, and prepare an electrolytic solution, using a diaphragm electrolyzer, constant current electrolysis, and setting the current density at 1A / m 2 , Electrolyzed at 30°C for 60 minutes, the particulate manganese dioxide was suspended in the solution, the solution was filtered, the anode area afte...

Embodiment 2

[0034] Before electrolysis, carry out acid treatment on the anode plate to activate its surface: prepare an acid solution with a concentration of 0.5mol / L, use a lead-silver alloy plate for the anode, and use a stainless steel plate for the cathode, place the anode and cathode plates in the acid solution, at 0.01A / m 2 Electrolyze at room temperature for 30 minutes at a current density of 100%; lightly polish the anode plate after electrolysis with fine sandpaper to make its surface smooth.

[0035] Weigh 42g of chemically pure manganese sulfate, 75g of concentrated sulfuric acid, dissolve them in 250mL of water, add ethanol accounting for 10% of the mass of manganese sulfate as an active agent, and prepare an electrolytic solution, adopt a diaphragm electrolyzer, conduct constant current electrolysis, and set the current density at 5000A / m 2 , electrolysis at 30°C for 240min, particulate manganese dioxide was suspended in the solution, the solution was filtered, the anode a...

Embodiment 3

[0037] Before electrolysis, treat the anode plate with acid to activate its surface: prepare an acid solution with a concentration of 0.5mol / L; use a titanium-manganese alloy plate for the anode, and a graphite plate for the cathode. / m 2 Electrolyze at room temperature for 10 minutes at a current density of 100 min; slightly polish the anode plate after electrolysis with fine sandpaper to make its surface smooth.

[0038]Weigh 34g of chemically pure manganese sulfate, 25g of concentrated sulfuric acid, dissolve them in 250mL of water, add polysorbate accounting for 10% of the mass of manganese sulfate as an active agent, and prepare an electrolytic solution, using a diaphragm electrolyzer, constant current electrolysis, and the current density is set at 1A / m 2 , electrolyze at 90°C for 240 minutes, suspend particulate manganese dioxide in the solution, filter the solution, the anode area after filtration is paste, and the precipitate is washed several times. Alcohol is used...

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Abstract

The invention discloses a method for preparing powdery electrolytic manganese dioxide (EMD). In the method, the powdery EMD is directly obtained from solution by improving the electrolytic process and controlling the electrolytic condition; and during electrolysis, a diaphragm electrolytic cell is adopted, a lead silver alloy plate or a titanium manganese alloy plate subjected to acid treatment is taken as an anode, and a graphite plate or a stainless steel plate is taken as a cathode. The method comprises the following steps of: preparing electrolyte with 0.1 to 10.0mol / L sulfuric acid and 0.4 to 1.2mol / L manganese sulfate, adding an active agent into the electrolyte, electrolyzing at the temperature of between 20 and 100 DEG C under the action of ultrasonic waves, and filtering to obtain the powdery EMD; and washing the powdery EMD for multiple times, adding a dispersing agent into solution when the powdery EMD is washed for the last time, and drying to obtain the powdery EMD. The method has the characteristics that: the process flow is simple, energy consumption and cost are low, product particles are uniform and have good appearance, and the like.

Description

Technical field: [0001] The invention belongs to the technical field of electrolytic manganese dioxide (EMD) preparation, and relates to a preparation method of a powdery electrolytic manganese dioxide precursor used for synthesizing lithium manganate. Background technique: [0002] With the vigorous development of the electronics industry, the demand for EMD in the battery industry is gradually increasing. At present, the production of EMD in various countries mainly adopts high-temperature electrolysis, and the powdery electrolytic manganese dioxide is obtained by stripping the plate-shaped manganese dioxide from the electrolytic anode plate. Manganese is produced after crushing, rinsing, neutralization, drying and other treatments. Its disadvantages are that the product quality (such as particle size and shape) is difficult to control, the product is dense, the particle size is large, and the particles are uneven. The sodium ions mixed in the electrolysis process, Sulfate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/21
Inventor 王志兴牛莎莎郭华军李新海彭文杰张云河胡启阳
Owner CENT SOUTH UNIV
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