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Decomposition and Precipitation Circulation Process for Preparation of Trimanganese Tetroxide with Manganese Sulfate Solution

A technology of manganese tetroxide and manganese sulfate solution, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of high cost, unenvironmental protection, large consumption of ammonium bicarbonate, etc., and achieve the effect of high degree of automation and reduced energy consumption

Active Publication Date: 2016-01-20
CHONGQING SHANGJIA ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The traditional method of producing manganese tetraoxide by co-precipitation process is to use ammonium bicarbonate to precipitate manganese sulfate to obtain manganese carbonate, and then decompose manganese carbonate to make manganese tetraoxide. In the production process, a large amount of Ammonium bicarbonate, while producing a large amount of carbon dioxide, carbon dioxide is directly emitted into the air, causing the greenhouse effect, not environmentally friendly, and high cost

Method used

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  • Decomposition and Precipitation Circulation Process for Preparation of Trimanganese Tetroxide with Manganese Sulfate Solution

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Effect test

Embodiment 1

[0021] Inject 65*10 into the coprecipitation reactor 3 L manganese sulfate solution (concentration of manganese is 45g / l), add 5500kg ammonium bicarbonate, control the temperature at 30°C, react for 2 hours, then pump it to the belt filter for filtration, washing, filtration, and then send it to the decomposition kiln break down. When decomposing, control the amount of manganese carbonate entering the kiln to 1286±128kg / hour (8.94±0.89mol) (water content 20%), the decomposition temperature is 800°C, and the tail gas temperature is 110°C. Pass into manganese sulfate solution (the concentration of manganese is 45g / l) the feeding flow rate of manganese sulfate is 11*10 3 L / h, at the same time, the ammonia water with a mass concentration of 10% is charged at a feed rate of 1.46*10 3 L / h is pumped into the absorption tower to ensure that the pH of the reaction solution is about 6.5. The reacted slurry overflows from the discharge port into the coprecipitation reactor, and is pump...

Embodiment 2

[0023] Inject 65*10 into the coprecipitation reactor 3 L manganese sulfate solution (the content of manganese is 45g / l), add 5500kg ammonium bicarbonate, control the temperature at 30°C, react for 2 hours, then pump it to the belt filter for filtration, washing and filtration, and then send it to the decomposition kiln break down. The amount of manganese carbonate entering the kiln is controlled to be 1286±120kg / hour (water content 20%), the decomposition temperature is 800°C, and the tail gas temperature is 110°C. The content is 60g / l), according to the feed amount, it is 8.25*10 3 L / h is pumped into the absorption tower, and liquid ammonia water is injected into the absorption tower at the same time according to the feed rate of 146kg / h. Ensure that the pH of the reaction solution is about 6.5, and the reacted slurry overflows into the coprecipitation reactor, and is pumped to the belt filter for filtration, washing, and filtration, and then sent to the decomposition kiln ...

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Abstract

The invention discloses a decomposition deposition cycle technology for preparing trimanganese tetroxide through using a manganese sulfate solution. The technology comprises the following steps: 1, adding a manganese sulfate solution and ammonium bicarbonate into a deposition reaction kettle to make manganese in the manganese sulfate solution fully deposited, filtering, and washing to obtain manganese carbonate; 2, sending manganese carbonate into a suspension decomposition kiln, and decomposing to obtain trimanganese tetroxide; 3, introducing the manganese sulfate solution and ammonia water or liquefied ammonia into an absorbing tower, introducing tail gas from the suspension decomposition kiln into the absorbing tower to carry out a reaction, allowing the obtained reaction liquid to flow into a deposition reaction kettle, and depositing to obtain manganese carbonate, wherein the introduction amount of the ammonia water or liquefied ammonia makes the pH value of the reaction liquid controlled at about 6.5; and 4, sending manganese carbonate into the suspension decomposition kiln, and repeating step 3. The technology using carbon dioxide decomposed by manganese carbonate and the ammonia or liquefied ammonia to deposit manganese carbonate has the advantages of environmental protection, low energy consumption and low cost.

Description

technical field [0001] The invention relates to a decomposition and precipitation circulation process for preparing trimanganese tetraoxide with manganese sulfate solution. Background technique [0002] The traditional method when adopting co-precipitation process to produce manganese tetraoxide is to use ammonium bicarbonate to precipitate manganese sulfate to obtain manganese carbonate, and then decompose manganese carbonate to make manganese tetraoxide. In the production process, a large amount of ammonium bicarbonate, while producing a large amount of carbon dioxide, carbon dioxide is directly emitted into the air, causing the greenhouse effect, not environmentally friendly, and high cost. Contents of the invention [0003] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a decomposition and precipitation circulation process for preparing trimanganese tetraoxide with manganese sulfate. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02
Inventor 马俊才黎树春符靓廖新仁赵飞
Owner CHONGQING SHANGJIA ELECTRONICS
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