Preparation method of manganous-manganic oxide

A technology of manganese tetroxide and manganese powder, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of slow manganese hydrolysis, influence of purity, chlorine and sulfur residues, etc., to accelerate the hydrolysis reaction, accelerate the complexation, shorten the effect of time

Inactive Publication Date: 2013-04-24
JISHOU UNIVERSITY
View PDF13 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the addition of ammonium oxalate will form manganese oxalate precipitate with manganese ions, and the predetermined manganese hydroxide cannot be obtained, and the weak complexing ability of ammonium formate and ammonium acetate to manganese ions makes the hydrolysis rate of manganese slower
[0008] Chinese patent CN1252385A proposes to prepare trimanganese tetraoxide by a two-step method. In the first step, the metal manganese powder is completely generated into manganese hydroxide or basic manganese salt under the action of a catalyst, and in the second step, it is oxidized into trimanganese tetraoxide. ; Because t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of manganous-manganic oxide
  • Preparation method of manganous-manganic oxide

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1: First step reaction conditions: take manganese powder with a particle size less than 50μm, ammonium lactate concentration 10g / L, temperature 40°C, stirring speed 300rpm / min, reaction for 5h, all manganese hydroxides are generated; second step Reaction conditions: at a temperature of 60℃, blow in sufficient air to oxidize, stir at 300rpm / min, and complete the reaction in 4h. After washing and drying, trimanganese tetroxide is obtained. The product index is: manganese content is 71.6%, Na 2 O0.0045%, CaO0.0025%, MgO0.0045%, S0.007%, the specific surface area measured by BET method is 25.4m 2 / g; the above-mentioned filtrate is recycled after adding 10-20% of the original ammonium lactate dosage.

Example Embodiment

[0034] Example 2: The first step reaction conditions: take manganese powder with a particle size of less than 50μm, ammonium succinate concentration, namely 20g / L, temperature 50℃, stirring speed 400rpm / min, reaction for 6h, all to generate trimanganese tetroxide precursor The second step reaction conditions: at a temperature of 50 ℃, pass in sufficient air to oxidize, the air is dispersed into small bubbles through the air flow distributor, the stirring speed is 400 rpm / min, the reaction is completed for 6 hours, and the manganese tetroxide is obtained after washing and drying , Its product index is: manganese content is 71.8%, Na 2 O0.0048%, CaO0.0035%, MgO0.0044%, S0.006%, the specific surface area measured by BET method is 26.5m 2 / g; The above-mentioned filtrate is recirculated after adding 10-20% of the amount of ammonium orthosuccinate.

Example Embodiment

[0035] Example 3: Take manganese powder with a particle size of less than 50μm, ammonium lactate concentration of 20g / L, temperature of 30℃, stirring speed of 300rpm / min, reaction for 3h, all the precursors of trimanganese tetroxide are generated; reaction conditions of the second step: at temperature At 70℃, blow in enough air to oxidize, the air is dispersed into small bubbles through the air distributor, the stirring speed is 500rpm / min, and the reaction is completed for 4.5h. After washing and drying, trimanganese tetroxide is obtained. The product index is: manganese content is 71.9%, Na 2 00.0040%, CaO0.0046%, MgO0.0033%, S0.006%, the specific surface area measured by BET method is 24.8m 2 / g; the above-mentioned filtrate is recycled after adding 10-20% of the original ammonium lactate dosage.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Specific surface areaaaaaaaaaaa
Granularityaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of manganous-manganic oxide. Manganese metal powder is manufactured into manganous-manganic oxide with high purity and high specific surface area by using a two-step method in the presence of an organic acid catalyst or an organic acid amine salt catalyst. In the first step, the manganese powder is added into a solution containing the catalyst and hydrolyzed and reacted for a period of time, and all manganese powder is completely converted into hydroxide of the manganese; and in the second step, a suspension containing the hydroxide of the manganese is oxidized by air, filtered and dried by airflow so as to obtain solid powder of the manganous-manganic oxide, and a filter liquor is continuously used after being supplemented with a little amount of lost catalysts. The catalyst is characterized by being the organic acid or the amine salt of the organic acid; through adoption of the catalyst, the reaction speed can be increased, impurities in a product are reduced, the purity of the product is improved, the specific surface area of the product is increased and the manganous-manganic oxide with high purity and high specific surface area can be obtained.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of manganese tetraoxide. The invention relates to a catalyst used in the production of manganese manganese tetraoxide with high purity and high specific surface area by a two-step method of hydrolysis and oxidation of metal manganese powder. Background technique [0002] As an important industrial raw material, electronic grade trimanganese tetraoxide is mainly used in the preparation of manganese zinc ferrite and Li-Mn-O batteries, and their performance is affected by the purity and specific surface area of ​​trimanganese tetraoxide used. In the national standard GB / T21836-2008, there are specific regulations on the use of manganese tetraoxide for soft magnetic bodies. There is no clear regulation on the trimanganese tetraoxide used in the preparation of Li-Mn-O batteries, but experiments have confirmed that the Li-Mn-O battery positive electro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01G45/02
Inventor 陈上吴显明李长安刘伟刘建本
Owner JISHOU UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products