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High-proportion manganous-manganic oxide and preparation method thereof

A technology of manganese tetroxide and high specific gravity, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of difficult to increase tap density, low process cost, long oxidation time, etc., and achieve high product specific gravity, low process cost, The effect of uniform particle size distribution

Inactive Publication Date: 2010-12-01
HUNAN HUITONG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the hydrolyzate of manganese sulfate solution in alkaline medium has also been used to prepare trimanganese tetraoxide. This method is directly oxidized without electrolysis, which makes the process cost significantly lower. It was once paid attention to at home and abroad, but Manganese tetraoxide prepared by direct oxidation of manganese hydrolyzate has a large specific surface area, it is difficult to increase the tap density, and it is easy to generate basic manganese sulfate, and the oxidation time is relatively long

Method used

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  • High-proportion manganous-manganic oxide and preparation method thereof
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  • High-proportion manganous-manganic oxide and preparation method thereof

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Embodiment 1

[0025] a kind of like Figure 1 ~ Figure 2 The high specific gravity trimanganese tetraoxide of the present invention shown, the tap density of this high specific gravity trimanganese tetraoxide is 2.25g / cm 3 , the specific surface area is 1.9419m 2 / g, the median particle size is 8.42 μm.

[0026] The high specific gravity trimanganese tetraoxide of the present embodiment is prepared by the following method:

[0027] First, prepare the Mn 2+ Concentration is the manganese sulfate solution of 60g / L, 50g / L, add 5L Mn 2+ Air is directly passed through the manganese sulfate solution with an initial concentration of 60g / L for oxidation, the oxidation temperature is controlled at 55°C, the air flow rate is controlled at 900L / h-1200L / h, the initial pH value is 6.5, and the stirring intensity is 75r / min; With the Mn in the reaction system 2+ Slowly decrease the concentration, then slowly add Mn 2+ Manganese sulfate solution with a concentration of 50g / L, and slowly add ammonia ...

Embodiment 2

[0030] a kind of like Figure 3 ~ Figure 4 The high specific gravity trimanganese tetraoxide of the present invention shown, the tap density of this high specific gravity trimanganese tetraoxide is 2.10g / cm 3 , the specific surface area is 2.3276m 2 / g, the median particle size is 7.21 μm.

[0031] The high specific gravity trimanganese tetraoxide of the present embodiment is prepared by the following method:

[0032] First, the preparation of Mn 2+ Concentration is the manganese sulfate solution of 50g / L, to 5L, Mn 2+ Air is directly passed through the manganese sulfate solution with an initial concentration of 50g / L for oxidation, the oxidation temperature is controlled at 70°C, the air flow rate is controlled at 800L / h-1000L / h, the initial pH value is 6.0, and the stirring intensity is 85r / min; With the Mn in the reaction system 2+ Slowly decrease the concentration, then slowly add ammonia water dropwise, so that the pH value of the reaction system increases slowly, and ...

Embodiment 3

[0035] a kind of like Figure 5 ~ Figure 6 The high specific gravity trimanganese tetroxide of the present invention shown, the tap density of this high specific gravity trimanganese tetraoxide is 1.95g / cm 3 , the specific surface area is 2.9015m 2 / g, the median particle size is 10.72 μm.

[0036] The high specific gravity trimanganese tetraoxide of the present embodiment is prepared by the following method:

[0037] First, prepare 5L, Mn 2+ Concentration is the manganese sulfate solution of 80g / L, to Mn 2+ Air is directly passed through the manganese sulfate solution with an initial concentration of 80g / L for oxidation, the oxidation temperature is controlled at 80°C, the air flow rate is controlled at 800L / h-1000L / h, the initial pH value is 5.5, and the stirring intensity is 85r / min; With the Mn in the reaction system 2+ Slowly reduce the concentration, and then slowly add ammonia water dropwise, so that the pH value of the reaction system increases slowly, and is cont...

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Abstract

The invention relates to an oxide of manganese and a preparation method thereof, in particular to a high-proportion manganous-manganic oxide and a preparation method thereof. The tap density of the high-proportion manganous-manganic oxide is at least 1.8g / cm<3>, and the specific surface area thereof is 1.5m<2> / g-3.0m<2> / g. The preparation method comprises the following steps of: directly introducing air into a manganese sulfate solution for oxidation, wherein the air flow is controlled to be 800L / h-2500L / h, the oxidation temperature is controlled to be 50-80 DEG C, and the stirring strength in the oxidation process is 75r / min-200r / min; dropwise adding ammonia water in the oxidation process so as to neutralize H<+> generated by oxidization reaction to make the pH value of a reaction system controlled to be 4.5-8.0; repeatedly rinsing manganous-manganic oxide slurry obtained after the reaction is completely ended by using pure water and then drying to obtain the high-proportion manganous-manganic oxide. The high-proportion manganous-manganic oxide not only has higher tap density, smaller specific surface area and even particle size distribution but also has low impurity content and low preparation cost.

Description

technical field [0001] The invention relates to a manganese compound and a preparation method thereof, in particular to a manganese oxide and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of electronic products such as AV machines and notebook computers in the direction of portability and wireless, the requirements for driving power for such products are also getting higher and higher. Demand for secondary batteries has also increased. At the same time, people have also begun to realize the enthusiasm and importance of low-carbon economy and circular economy to the entire ecological environment. Green industries such as new energy vehicles have also begun to be encouraged and respected. New energy vehicles (especially electric vehicles) Vehicles, hybrid vehicles, fuel cell vehicles, etc.) reserve power is a large demand for medium and large batteries. Based on this situation, lithium-ion secondary batteries, which h...

Claims

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Application Information

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IPC IPC(8): C01G45/02
Inventor 彭天剑申喜元陈丽鹃唐素娟
Owner HUNAN HUITONG SCI & TECH
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