A method for preparing trimanganese tetraoxide by two-stage dry roasting of manganese sulfate

A technology of manganese tetroxide and dry roasting, applied in chemical instruments and methods, manganese oxide/hydroxide, sulfur compounds, etc., can solve the problems of environmental pollution in production process, increase in production cost, and high safety risk, and achieve improved performance. The effect of comprehensive utilization rate, loose packing density and environmental impact reduction

Active Publication Date: 2021-01-19
四川星恒青源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, manganese carbonate is produced by carbonizing manganese sulfate, and manganese hydroxide is produced by neutralizing manganese sulfate with alkali. Both of them need to co-produce manganese sulfate, resulting in increased production costs.
The second is the two-stage manganese sulfate roasting method (Two Calcination Manganese Sulfate referred to as "TCM" method). For this method, many researchers and entrepreneurs have studied and explored it in the past period of time, but there are still some problems, such as preparing The product is far from the physical performance requirements of the lithium manganese oxide precursor for new energy batteries, the impurity content is high, there is no clear calcination atmosphere and means, the production process used is serious environmental pollution, the production process is difficult, and the safety risk is high.

Method used

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  • A method for preparing trimanganese tetraoxide by two-stage dry roasting of manganese sulfate
  • A method for preparing trimanganese tetraoxide by two-stage dry roasting of manganese sulfate
  • A method for preparing trimanganese tetraoxide by two-stage dry roasting of manganese sulfate

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Experimental program
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Effect test

Embodiment 1

[0034] Material selection:

[0035] Raw manganese sulfate quality requirements: the main content of the mass percentage is ≥ 32.2% in terms of Mn.

[0036] The index of impurity mass percentage content in the raw material manganese sulfate is shown in Table 1.

[0037] Table 1: Index of impurity mass percentage content in raw manganese sulfate

[0038]

[0039] The first stage of calcination: 500kg of manganese sulfate raw material that meets the requirements is transported to the drying silo by a belt conveyor or vacuum air flow, and the feeding is controlled by a screw (frequency conversion is 10Hz), and evenly fed to the first stage of drying kiln , Control the kiln speed of the rotary kiln to 35s / cycle, use natural gas to heat up the drying kiln to make the temperature reach 600°C, dry the material, and maintain the residence time of the material in the kiln for 2hr. The water vapor in the kiln is pumped into the scrubber by the induced draft fan to wash the tail gas ...

Embodiment 2

[0049] Material selection:

[0050] Raw manganese sulfate quality requirements: the main content of the mass percentage is ≥ 32.2% in terms of Mn.

[0051] The mass percentage index of impurities in the raw material manganese sulfate is shown in Table 1.

[0052] The first stage of calcination: 500kg of manganese sulfate raw material that meets the requirements is transported to the drying silo by a belt conveyor or vacuum air flow, and the feeding is controlled by a screw (frequency conversion is 10Hz), and evenly fed to the first stage of drying kiln , control the kiln speed of the rotary kiln to 35s / cycle, use natural gas to heat up the drying kiln to make the temperature reach 550°C, dry the material, and maintain the residence time of the material in the kiln for 2hr. The water vapor in the kiln is pumped into the scrubber by the induced draft fan to wash the tail gas and discharge it up to the standard.

[0053]The second stage of calcination: the dried materials in th...

Embodiment 3

[0062] Material selection:

[0063] Raw manganese sulfate quality requirements: the main content of the mass percentage is ≥ 32.2% in terms of Mn.

[0064] The index of impurity mass percentage content in the raw material manganese sulfate is shown in Table 1.

[0065] Two-stage calcination: transport 800kg of manganese sulfate raw materials that meet the requirements to the raw material transfer bin with a belt conveyor or vacuum airflow for automatic feeding; then run the entire roller kiln system and operate auxiliary equipment at the same time, and then separately The roller kiln drying section and the calcining section heat up. When the temperature reaches the process control requirements (that is, drying at 600°C and calcining at 1350°C), the loading manipulator is started to load the assembly line from the transfer bin to control each sagger The loading weight is 6kg; when the material passes through the drying section, all the moisture in the material is dried, and th...

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Abstract

The invention discloses a method for preparing manganous-manganic oxide by using manganese sulfate two-section roasting. The method for preparing the manganous-manganic oxide by using the manganese sulfate two-section roasting comprises the following steps: drying materials for 2 hours by keeping the materials at a constant temperature of 500-600 degrees centigrade, wherein in the drying process,water vapor in a kiln is pumped into a washing tower to be washed by using an induced draft fan; calcining the dried materials for 6 hours at a constant temperature of 1150-1350 degrees centigrade; introducing SO2 gas generated by calcining into a sulfur dioxide collection system by using the induced draft fan; conveying the calcined materials to a cooling section; cooling the calcined materials to a normal temperature; and finally crushing the cooled materials to prepare the manganous-manganic oxide. The method for preparing the manganous-manganic oxide by using the manganese sulfate two-section roasting, disclosed by the invention, has the advantages that the mass percentage of the main content of the prepared manganous-manganic oxide is more than or equal to 71.00% in Mn; the purity ishigh; impurities are less; indexes such as tap density and apparent density can all very well meet physical performance requirements of a new energy battery lithium manganese oxides precursor. In addition, tail gas is utilized, so that the influences on the environment are reduced and the comprehensive utilization rate of the raw material is also increased.

Description

technical field [0001] The invention relates to the technical field of producing lithium manganese oxide precursors for new energy batteries, in particular to a method for preparing trimanganese tetraoxide by two-stage dry roasting of manganese sulfate. Background technique [0002] The development of new energy vehicles has greatly promoted the development of the lithium battery industry. In the lithium battery industry, especially lithium manganese oxide batteries, because of their high capacity, many charging times, safe use, and easy recycling, they are widely used by manufacturers and researchers. The favor of personnel, and the precursor of this kind of battery market is manganese tetraoxide, which has obvious price advantages compared with nickel, cobalt and other elements, resulting in the rapid development of industrial preparation technology of manganese tetraoxide. [0003] At present, the industrial preparation technology of trimanganese tetroxide is classified a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02C01B17/52C01B17/74
CPCC01B17/52C01B17/74C01G45/02
Inventor 胡义华王正伟
Owner 四川星恒青源新材料科技有限公司
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