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Method for reducing pyrolusite by carrying out microwave heating on biomass

A microwave heating and biomass technology, which is applied in metallurgy and microwave heating biomass reduction pyrolusite field, can solve the problem of high equipment requirements, achieve the effect of increasing material contact area, increasing reaction intensity, and improving energy utilization rate

Active Publication Date: 2017-11-28
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this reaction needs to be carried out in an autoclave, which requires high equipment

Method used

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  • Method for reducing pyrolusite by carrying out microwave heating on biomass

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Effect test

Embodiment 1

[0036] A method for reducing pyrolusite by microwave heating biomass, the implementation steps of this embodiment are as follows:

[0037] The raw material pyrolusite is firstly analyzed, and its chemical composition is MnO by weight 2 22.4% and FeO 8.4%; the particle size of the pyrolusite after sieving is not greater than 200 mesh (0.074 mm).

[0038] The raw biomass was industrially analyzed, and its chemical composition was 66.19% volatile matter, 10.81% ash, 14.08% fixed carbon and 8.92% moisture; mm).

[0039] A. Mixed ingredients

[0040] The pyrolusite and biomass are mixed with a mass ratio of 1:10, and then

[0041] B. briquetting

[0042] Add 1% methyl cellulose by weight to the pyrolusite and biomass mixture, mix evenly, moisten it, put it into a special mold, make green pellets under 25 MPa pressure, and put it in an oven to dry for 12 h above;

[0043] C, microwave reduction

[0044] After the green pellets obtained in step B were put into a corundum cruc...

Embodiment 2

[0047] A method for reducing pyrolusite by microwave heating biomass, the implementation steps of this embodiment are as follows:

[0048] The raw material pyrolusite is firstly analyzed, and its chemical composition is MnO by weight 2 31.2% and FeO 23.7%; the particle size of the pyrolusite after sieving is not greater than 200 mesh (0.074 mm).

[0049] The raw biomass was industrially analyzed, and its chemical composition was 66.19% by weight of volatile matter, 10.81% of ash, 14.08% of fixed carbon and 8.92% of moisture; the particle size of the biomass after screening was not greater than 200 mesh (0.074 mesh). mm).

[0050] A. Mixed ingredients

[0051] The pyrolusite and biomass are mixed with a mass ratio of 2:10, and then

[0052] B. briquetting

[0053] Add 1% methyl cellulose by weight to the pyrolusite and biomass mixture, mix evenly, moisten it, put it into a specific mold, make green pellets under 25 MPa pressure, and put it in an oven to dry for 12 h above...

Embodiment 3

[0058] A method for reducing pyrolusite by microwave heating biomass, the implementation steps of this embodiment are as follows:

[0059] The raw material pyrolusite is firstly analyzed, and its chemical composition is MnO by weight 2 31.2% and FeO 23.7%; the particle size of the pyrolusite after sieving is not greater than 200 mesh (0.074 mm).

[0060] The raw biomass was industrially analyzed, and its chemical composition was 79.6% volatile matter, 0.87% ash, 13.02% fixed carbon and 6.51% moisture; mm).

[0061] A. Mixed ingredients

[0062] The pyrolusite and biomass are mixed with a mass ratio of 2:10, and then

[0063] B. briquetting

[0064] Add 1% methyl cellulose by weight to the pyrolusite and biomass mixture, mix evenly, moisten it, put it into a special mold, make green pellets under 25 MPa pressure, and put it in an oven to dry for 12 h above;

[0065] C, microwave reduction

[0066] After the green pellets obtained in step B were put into a corundum cruci...

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Abstract

The invention relates to a method for reducing pyrolusite by carrying out microwave heating on biomass and belongs to the technical field of microwave metallurgy. The method comprises the following steps: smashing pyrolusite and biomass, uniformly mixing to obtain a mixed material, then briquetting the mixed material, then putting into a corundum crucible, wrapping the outer wall of the corundum crucible with a thermal insulation material, then putting into a controllable atmosphere box-type microwave reactor, heating to 750-850 DEG C in presence of inert gas, carrying out heat preservation for 15-30 minutes, and carrying out furnace cooling to room temperature, thereby obtaining MnO-containing pellets. The method provided by the invention has the advantages that briquetting is carried out on the pellets, material contact area is increased, and reaction intensity is increased; and the advantages of selectivity and internal heating of the microwave heating are utilized, time required for reaction is shortened, and energy consumption utilization rate is improved.

Description

technical field [0001] The invention relates to a method for carbothermally reducing pyrolusite, in particular to the technical field of reducing pyrolusite by microwave heating, and belongs to the technical field of metallurgy. Background technique [0002] Manganese is an important strategic metal, and its content in the earth's crust is more than 0.1%. Most of manganese resources exist in the form of compounds in various silicate ores. In modern industry, manganese ore is an important basic bulk raw material mineral, 90%-95% is used in the iron and steel industry, mainly used as alloying element and desulfurization, deoxidizer and so on. [0003] my country is rich in manganese mineral resources. At present, manganese carbonate ore is the most used. After years of large-scale mining, manganese carbonate ore resources are increasingly scarce, which can no longer meet the huge demand for raw materials in the domestic electrolytic manganese industry. On the other hand, the ...

Claims

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Application Information

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IPC IPC(8): C22B1/244C22B1/00C22B47/00
CPCC22B1/00C22B1/2406C22B1/244C22B47/00
Inventor 陈菓廖雪峰陈晋彭金辉刘钱钱李毅恒冯康露何奥希
Owner YUNNAN MINZU UNIV
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