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A kind of method that manganese oxide gas-based reduction prepares manganese carbide

A technology of manganese oxide and manganese carbide, which is applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of high smelting temperature, reduce the reduction roasting temperature, shorten the production process, and have a wide range of sources

Active Publication Date: 2018-06-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

2) The melting temperature is high, as high as 1300 ° C ~ 1500 ° C

Method used

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  • A kind of method that manganese oxide gas-based reduction prepares manganese carbide
  • A kind of method that manganese oxide gas-based reduction prepares manganese carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The mass percentage of -325 mesh particle size is 90% of the mixture of analytically pure manganese dioxide and trimanganese tetraoxide, added with 0.5% of CMC and 7.5% of water, then pelletized, and then dried, the dried Sample in CH 4 10% by volume, H 2 Volume percentage 30%, CO volume percentage 10%, N 2 Carry out roasting in the atmosphere of 50% volume percent, roasting temperature 1150 ℃, roasting time is 120min, then in N 2 After cooling to room temperature in the atmosphere, the obtained roasted product is a manganese carbide product, and the conversion rate of manganese dioxide is 95%. The XRD pattern of manganese carbide obtained under this condition is as follows figure 1 As shown, the SEM pictures of manganese carbide particles are as follows figure 2 shown.

Embodiment 2

[0027] The -325 mesh particle size accounted for 92% pure mineral manganese dioxide, added 0.5% bentonite and 7.5% moisture, then pelletized, then dried, and the dried sample was placed in CH 4 8% by volume, H 2 Volume percentage 62%, CO volume percentage 20%, N 2 Carry out roasting in the atmosphere of 10% volume percent, roasting temperature 1250 ℃, roasting time is 30min, then in N 2 After cooling to room temperature in the atmosphere, the obtained roasted product is a manganese carbide product, and the conversion rate of manganese dioxide is 94%.

Embodiment 3

[0029] The -325 mesh particle size accounted for 95% pure mineral manganese oxide, added 0.5% humic acid and 7.5% water, then pelletized, then dried, and the dried sample was placed in CH 4 20% by volume, H 2 Volume percentage 60%, CO volume percentage 12%, N 2 Carry out roasting in the atmosphere of 8% volume percent, roasting temperature 1200 ℃, roasting time is 90min, then in N 2 After cooling to room temperature in the atmosphere, the obtained roasted product is a manganese carbide product, and the conversion rate of manganese dioxide is 96%.

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Abstract

The invention discloses a method for preparing manganese carbide by gas-based reduction of manganese oxides. The method comprises the following steps of mixing the manganese oxides, a bonding agent and water uniformly, agglomerating and drying, putting dry blocks into mixed atmosphere containing H2, CH4, CO and N2, calcining to obtain a manganese carbide product. Compared with the traditional method for preparing the manganese carbide by high-temperature smelting of manganese metal and graphite, the method disclosed by the invention has the characteristics of moderate reaction condition, low cost and simple process flow, and the prepared manganese carbide is high in purity and is applicable to requirements for preparing precursors of various functional materials.

Description

technical field [0001] The invention relates to a method for preparing manganese carbide by gas-based reduction of manganese oxide, in particular to a method for preparing manganese carbide by gas-based solid-state reduction of manganese oxide, and belongs to the field of preparation of functional material precursors. Background technique [0002] Trimanganese tetroxide is one of the important raw materials for the production of manganese zinc ferrite soft magnetic materials in the electronics industry, and it is widely used. According to reports, manganese carbide hydrolysis is one of the preparation methods of manganese tetraoxide micropowder. A method for producing manganese tetraoxide with carbon-manganese alloy (application number 200810203968.9), a method for producing manganese tetraoxide with low selenium and high specific surface area with one-step method of carbon-manganese alloy (application number: 200910044828.6), manganese carbide hydrolysis oxidation method P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/914
CPCC01P2002/72C01P2004/03
Inventor 张元波刘兵兵李光辉姜涛苏子键彭志伟范晓慧黄柱成郭宇峰杨永斌李骞陈许玲甘敏徐斌张鑫杜明辉陈迎明刘继成欧阳学臻
Owner CENT SOUTH UNIV
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