Method for preparing carbon-containing fused magnesite with electric-arc furnace

A technology of fused magnesia and electric arc furnace, which is applied in the field of fused magnesia smelting, can solve the problems of carbon element residues and undisclosed issues, and achieve the effects of improving conductivity, reducing waste of resources, and saving power consumption

Inactive Publication Date: 2019-06-25
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This document does not disclose how to make the carbon component melt into the high temperature liquid under high temperature conditions before the electric arc furnace electric melting treatment of magnesite crushed ore and fine ore to make sand, and finally the carbon element remains in the electric fused magnesia.

Method used

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  • Method for preparing carbon-containing fused magnesite with electric-arc furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 920kg (equivalent to 92% by weight) of three kinds of (first, second, third grade) magnesite crushed ore ore, 60kg of petroleum coke (equivalent to 6% by weight), 20kg of phenolic resin powder (equivalent to 2% by weight), mixed evenly with a mixer, pressurized at 40MPa by a mineral powder briquette machine, and then dried at 250°C for 6 hours, and put the dried pellets into an electric arc furnace for smelting, buried The arc melting time is 12 hours. The melted lumps are naturally cooled for more than 7 days. After cooling, the melted lumps are broken into 80~120mm particle size, and then classified according to the grade. Finally, the classified samples are tested separately and determined according to the test results. product grade.

[0031] According to the method described in Example 1 to prepare fused magnesia, the single power consumption is 2800kWh, and the electrode consumption is 40kg. The product is characterized by means of chemical analysis and X-ra...

Embodiment 2

[0035] Take three kinds (first grade, second grade, third grade) magnesite crushed ore or fine ore 910kg (equivalent to 91% by weight), 65kg of earthy graphite powder (equivalent to 6.5% by weight), 25kg of phenolic resin powder (Equivalent to 2.5% by weight) Mix evenly with a mixer, pressurize 40MPa with a mineral powder briquetting machine, shape, and then dry at 275°C for 6 hours, put the dried pellets into an electric arc furnace for smelting, The submerged arc melting time is 12 hours. The melted lumps are naturally cooled for more than 7 days. After cooling, the melted lumps are broken into 80~120mm particle size, and then classified according to the grade. Finally, the classified samples are tested separately. According to the test results Determine the product class.

[0036] According to the method described in Example 2 to prepare fused magnesia, the single power consumption is 2750 kWh, and the electrode consumption is 50 kg. The product is characterized by means o...

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Abstract

The invention relates to the technical field of fused magnesite smelting, in particular to a method for preparing carbon-containing fused magnesite with an electric-arc furnace. The carbon-containingfused magnesite is characterized by being prepared from the following raw materials in percentage by weight: amorphous graphite and/or petroleum coke, phenolic resin and magnesite powder. The preparation process comprises material mixing, pelletizing and clustering, fusing, cooling and sorting. Compared with the prior art, the method has the beneficial effects that: 1) a carbon-containing raw material is added into fused magnesite briquette in advance, thereby improving the conductivity of a fused material, reducing the loss of electrodes, and achieving the aim of lowering power consumption; 2) smelting is performed by pelletizing smashed ore or powdered ore of magnesite, and crude ore is small in granularity and relatively loose in structure, so that the crude ore is easier to decompose and melt during smelting in the electric-arc furnace. By adopting the method, the production benefit can be improved in the production of the fused magnesite; meanwhile, waste resources left after mining can be utilized fully, the environment can be improved, and the resource waste is reduced.

Description

technical field [0001] The invention relates to the technical field of fused magnesia smelting, in particular to a method for preparing carbon-containing fused magnesia by an electric arc furnace. Background technique [0002] China is one of the countries rich in magnesite resources in the world. Among the magnesite resources it has, low-grade magnesite accounts for nearly half of the total reserves. Mining lacks scientific basis and is highly random. The phenomenon of mining the rich and abandoning the poor, and random mining are very serious. During the mining and rough processing of high-quality magnesite, a large amount of powder will be produced, and when beneficiating low-grade magnesite, the original ore needs to be crushed. These behaviors have caused a large amount of crushed ore and fine ore to be abandoned, and resources cannot be effectively used. [0003] Fused magnesia produced by electric arc furnace is one of the most important raw materials for refractori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C04B35/66C04B35/043
Inventor 罗旭东郑玉李婷
Owner UNIV OF SCI & TECH LIAONING
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