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A kind of sodium manganese oxide micropowder and preparation method thereof

A sodium manganese oxide and micropowder technology, applied in manganese compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems affecting the quality of the composition and the high requirements of mixing uniformity, and achieve large-scale production and easy large-scale production. Production, the effect of low crystallinity

Active Publication Date: 2016-10-05
GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

High-temperature solid-phase method products have the highest crystallinity, but due to the solid-state reaction, the requirements for uniformity of the mixture are high, and the finer the solid particles are ground, the better the effect, otherwise the quality of the compound will be seriously affected

Method used

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  • A kind of sodium manganese oxide micropowder and preparation method thereof
  • A kind of sodium manganese oxide micropowder and preparation method thereof
  • A kind of sodium manganese oxide micropowder and preparation method thereof

Examples

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Embodiment 1

[0029] A kind of sodium manganese oxide micropowder of the present invention, the sodium content of this sodium manganese oxide micropowder is 5.6%, the crystal structure of this micropowder and Na 0.55 mn 2 o 4 1.5H 2 O is consistent, with low crystallinity, wrinkled surface, fluffy and porous structure characteristics, and its particle size D 50 12.2μm, tap density 0.57g / cm 3 , with a specific surface area of ​​92m 2 / g (see Table 1 below).

[0030] The preparation method of the sodium manganese oxide micropowder of the foregoing embodiments of the present invention comprises the following steps:

[0031] Pre-prepared manganese sulfate solution with a metal manganese content of 90g / L and a sodium hydroxide solution with a concentration of 240g / L, added 10L of pure water into a 30L reaction kettle as the bottom liquid, and heated until the temperature reached 55°C. Stir, first add a small amount of sodium hydroxide solution to make the pH value of the bottom liquid be 1...

Embodiment 2

[0035] A kind of sodium manganese oxide micropowder of the present invention, the sodium content of this sodium manganese oxide micropowder is 8.5%, the crystal structure of this micropowder and Na 0.55 mn 2 o 4 1.5H 2 O is consistent, with low crystallinity, wrinkled surface, fluffy and porous structure characteristics, and its particle size D 50 12.9μm, tap density 0.52g / cm 3 , with a specific surface area of ​​69m 2 / g (see Table 1 above).

[0036] The preparation method of the sodium manganese oxide micropowder of the foregoing embodiments of the present invention comprises the following steps:

[0037] Pre-prepared manganese chloride solution with a metal manganese content of 45g / L and a sodium hydroxide solution with a concentration of 60g / L, put 2L of pure water into an 8L reactor as the bottom liquid, and heated until the temperature reached 65°C and then introduced air And stir, first add a small amount of sodium hydroxide solution to make the pH value of the bo...

Embodiment 3

[0039] A kind of sodium manganese oxide micropowder of the present invention, the sodium content of this sodium manganese oxide micropowder is 9.6%, the crystal structure of this micropowder and Na 0.55 mn 2 o 4 1.5H 2 O is consistent, with low crystallinity, wrinkled surface, fluffy and porous structure characteristics, and its particle size D 50 20.6μm, tap density 0.60g / cm 3 , with a specific surface area of ​​86m 2 / g (see Table 1 above).

[0040] The preparation method of the sodium manganese oxide micropowder of the foregoing embodiments of the present invention comprises the following steps:

[0041] Pre-prepared manganese sulfate solution with a metal manganese content of 120g / L and a sodium hydroxide solution with a concentration of 200g / L, added 3000L of pure water to an 8000L reaction kettle as the bottom liquid, heated until the temperature reached 70°C, and introduced air and Stir, first add a small amount of sodium hydroxide solution to make the pH of the b...

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Abstract

A sodium-manganese oxide micropowder, wherein the sodium content is more than 5%, its particle size D50 is 5-100 μm, its tap density is 0.2-0.8 g / cm3, and its specific surface area is greater than 60 m2 / g; its preparation method comprises the following steps : At a temperature of 40°C to 90°C, the soluble divalent manganese salt solution and the sodium hydroxide solution are continuously added in parallel flow into a reaction kettle continuously fed with sufficient air, and the pH value of the reaction system is controlled to be above 10.5. Stay in the reactor for 4-20 hours, then wash the obtained black slurry with water, and dry to obtain sodium manganese oxide powder. The invention has the advantages of low synthesis temperature, simple process route, short reaction time, high production efficiency, low production cost, and the product has better performance.

Description

technical field [0001] The invention belongs to the technical field of manganese oxide materials and their preparation, and in particular relates to a sodium manganese oxide micropowder and a manufacturing method thereof. Background technique [0002] Sodium manganese oxide refers to the embedded Na in manganese dioxide + compounds, of which birnessite is the most typical. Natural birnessite is a manganese oxide formed by blending trivalent manganese and tetravalent manganese, generally in a layered structure, and its chemical formula can be approximately described as Na 4.1 mn 14 o 28 9H 2 O, and artificially synthesized sodium manganese oxide, due to the different synthesis processes and conditions, there are significant differences in its crystal structure, chemical composition and physical and chemical properties. [0003] With the continuous progress of research and development work, it is found that sodium manganese oxide has new application prospects in the field...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/00H01M4/505
CPCY02E60/10
Inventor 刘务华高智彭天剑
Owner GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD