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Method for pre-calcining carbon-containing manganese ore through microwave heating

A technology for carbon-containing manganese ore and microwave heating is applied in the field of microwave metallurgy and ferromanganese alloy smelting. , the effect of improving production efficiency

Inactive Publication Date: 2015-05-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims at the large load of smelting furnace and low productivity in the technology of melting manganese-ferroalloy with ore cold material into the furnace in the prior art, and the phenomenon of material collapse and splashing is easy to occur in the production process, and large-sized ore or sintered, cooled and crushed sieves are required. To solve the problem of using small particle size ore, provide a method for microwave heating and pre-calcining carbon-containing manganese ore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The method for pre-calcining carbon-containing manganese ore by microwave heating, its specific steps are as follows:

[0025] Step 1. First, crush the carbon-manganese ore to 5-20mm, and the carbonaceous reducing agent to 50-100 meshes, and then mix the carbon-manganese ore and the carbonaceous reducing agent evenly according to the mass ratio of 95:5 to obtain a mixed material; Carbon-manganese ore includes the following mass percentage components: Mn 2 o 3 36.1%, CaCO 3 10.4%; carbonaceous reducing agent is coal;

[0026] Step 2. The mixed material obtained in step 1 is reduced to low-valent manganese oxide and carbonate under microwave conditions at 750°C to decompose for 50 minutes to obtain a hot material, and the reduction rate of the hot material is 70.4 %, the temperature is maintained at 723°C without pulverization.

Embodiment 2

[0028] The method for pre-calcining carbon-containing manganese ore by microwave heating, its specific steps are as follows:

[0029] Step 1. First crush the carbon-manganese ore to 20-35mm, and the carbonaceous reducing agent to 50-100 meshes, and then mix the carbon-manganese ore and the carbonaceous reducing agent uniformly according to the mass ratio of 97:3 to obtain a mixed material; wherein Carbon-containing manganese ore includes the following mass percentage components: Mn 2 o 3 39.5%, CaCO 3 20%; carbonaceous reducing agent is coal powder;

[0030] Step 2. Reduce the high-valent manganese oxides to low-valent manganese oxides and carbonates by decomposing the mixed materials obtained in step 1 under microwave conditions at 800°C for 40 minutes to obtain hot materials. The reduction rate of the hot materials is 88.3%. , The temperature is maintained at 776 ° C without pulverization.

Embodiment 3

[0032] The method for pre-calcining carbon-containing manganese ore by microwave heating, its specific steps are as follows:

[0033] Step 1. First crush the carbon-manganese ore to 35-50 mm, and the carbonaceous reducing agent to 60-200 mesh, and then mix the carbon-manganese ore and the carbonaceous reducing agent uniformly according to the mass ratio of 96:4 to obtain a mixed material; Carbon-containing manganese ore includes the following mass percentage components: Mn 2 o 3 40.6%, CaCO 3 22.3%; carbonaceous reducing agent is charcoal;

[0034] Step 2. Reduce the high-valent manganese oxides to low-valent manganese oxides and carbonates by decomposing the mixed material obtained in step 1 under microwave conditions at 850°C for 50 minutes to obtain hot materials. The reduction rate of the hot materials is 88%. , The temperature is maintained at 821 ° C without pulverization.

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Abstract

The invention relates to a method for pre-calcining carbon-containing manganese ore through microwave heating, and belongs to the technical field of microwave metallurgy and manganese-iron alloy smelting. The method comprises: crushing carbon-containing manganese ore to 5-80 mm, crushing a carbonaceous reducing agent to 50-200 mesh, and then uniformly mixing carbon-containing manganese ore and the carbonaceous reducing agent to obtain a mixed material; keeping warm at 750-950 DEG C under a microwave condition for 20-50 min, so as to obtain a water-eliminated thermal-state material possessing a certain carbonate decomposition rate and obtained after high-valent manganese oxides are reduced. According to the method, a microwave heating precalcination process is firstly employed for reducing high-valent manganese oxides in carbon-containing manganese ore, and then a manganese-iron alloy melting furnace (blast furnace or submerged arc furnace) reducing reaction in the prior art is combined for preparing manganese-iron alloy.

Description

technical field [0001] The invention relates to a microwave heating method for precalcining carbon-containing manganese ore, which belongs to the technical fields of microwave metallurgy and ferromanganese alloy smelting. Background technique [0002] In modern industry, ferromanganese alloy has a very important strategic position. Ferromanganese alloys are widely used in the manufacturing of steel and stainless steel, with a consumption of 0.8-0.9% of steel production, which accounts for 85-90% of the total manganese demand. [0003] The current main industrial production process of manganese ferroalloy is to put the "cold material" of carbon-containing manganese ore directly into blast furnace or submerged arc furnace for smelting. The advantage of this process is that the steps are simple and the required supporting equipment is relatively small. But its disadvantages are obvious. Because the cold material is put into the furnace, the melting furnace needs to heat the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B47/00
CPCC22B1/02C22B47/00
Inventor 张利波叶乾旭彭金辉陈菓朱红波普靖中李磊
Owner KUNMING UNIV OF SCI & TECH
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