Method for preparing manganese carbonate

A technology of manganese carbonate and ammonium bicarbonate, applied in chemical instruments and methods, manganese compounds, inorganic chemistry, etc. Questions such as requirements

Inactive Publication Date: 2010-05-12
GUIZHOU REDSTAR DEVING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the manganese carbonate prepared by the existing method does not meet the technical indicators of the secondary battery due to the content of impurities, especially the content of calcium and magnesium ions does not meet the requirements of the secondary battery.

Method used

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  • Method for preparing manganese carbonate
  • Method for preparing manganese carbonate

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Experimental program
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Effect test

Embodiment 1

[0018] 354g / L MnSO with a pH value of 3 4 Put 2000ml of the solution in a 5000ml beaker, and heat it in an electric furnace to control the temperature at 35±5°C. Slowly add 749g of food-grade ammonium bicarbonate. During the process, control the temperature of the reaction system to maintain the range of 35±5°C. The time for adding the synthetic agent is controlled at 40°C. 4 ) 2 SO 4 , The solid is hot-washed twice at 100°C at a material-to-water ratio of 1:5, and the washing time is controlled at about 1 hour each time.

[0019] Place the manganese carbonate after washing in a vacuum oven at 85°C for 16 hours to obtain manganese carbonate sample 1 # .

Embodiment 2

[0021] 354g / L MnSO with a pH value of 2 4 Put 1000ml of the solution in a 5000ml beaker, heat it in an electric furnace to 55±5°C, and slowly add 1.5mol / L NH 4 HCO 3 The solution is synthesized. During the synthesis process, the power of the electric furnace is adjusted to maintain the system temperature at 55±5°C. The synthesis agent is added within 30 minutes, and the volume is 3125ml.

[0022] The above-mentioned synthetic solution was subjected to solid-liquid separation, and the solid part was hot-washed twice at 80°C with a material-to-water ratio of 1:5, each time for 1 hour. After suction filtration, it was dried in a vacuum oven at 85°C for 16 hours to obtain a manganese carbonate sample. 2 # .

Embodiment 3

[0024] 354g / L MnSO with a pH value of 4 4 Put 500ml of the solution in a 5000ml beaker, raise the temperature to 55±5°C while stirring, slowly add 1.50mol / L NH 4 HCO 3 Solution 1500ml, then add 354g / l MnSO 4 Solution 500ml, add 1.5mol / lNH under stirring 4 HCO 3 The solution was 1625ml, and the time for adding the synthetic agent was maintained at 35 minutes each time.

[0025] The above-mentioned synthesized solution was subjected to solid-liquid separation, and the solid part was hot-washed twice at 100°C according to the material-to-water ratio of 1:5, each time for 1 hour. After suction filtration, it was dried in a vacuum oven at 85°C for 16 hours, and manganese carbonate sample 3 was obtained. # .

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Abstract

The invention relates to a method for preparing manganese carbonate, which comprises the steps of: adding MnSo4 into H2SO4, and adjusting the pH value to be between 2 and 4; adding ammonium hydrogen carbonate into the mixture for synthesis under the stirring at the temperature of between 30 and 80 DEG C, and controlling a synthesis end point to ensure an equimolar reaction to obtain a synthetic fluid; and performing solid-liquid separation on the synthetic fluid, using hot water at the temperature of between 80 and 100 DEG C to wash a solid phase, and then drying the solid phase to obtain the manganese carbonate. The method can prepare manganese carbonate with low calcium and low manganese, and can obtain the manganese carbonate with different particle size distributions.

Description

technical field [0001] The invention relates to a preparation method of manganese carbonate. Background technique [0002] There are many methods for synthesizing manganese carbonate, generally using sodium carbonate as a synthetic agent, the impurity separation ability in the synthesis process of this type of method is relatively weak, especially the separation of calcium and magnesium ions of manganese sulfate is not obvious, and the sodium ions introduced at the same time affect the to the quality of manganese carbonate products. [0003] With the development of lithium manganate secondary batteries, corresponding high-quality narrow-distribution spherical manganese carbonate materials are required. Therefore, the manganese carbonate prepared by the existing method does not meet the technical indicators of the secondary battery due to the content of impurities, especially the content of calcium and magnesium ions does not meet the requirements of the secondary battery. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00
CPCC01G45/00C01P2004/51C01P2006/80
Inventor 姜志光华东
Owner GUIZHOU REDSTAR DEVING
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