System and process for smelting fused magnesia in sub-vacuum, capturing and recycling carbon dioxide

Abstract

The invention relates to a system for smelting fused magnesia in sub-vacuum, capturing and recycling carbon dioxide. The system comprises a smelting and moving trolley, a furnace body, a smelting furnace barrel, a feeding device, an electrode lifting mechanism, a bag-type dust remover, a transformer and an automatic control system, wherein the system further comprises a carbon dioxide recycling system connected with the bag-type dust remover; the furnace body is a sub-vacuum furnace body; and the carbon dioxide recycling system comprises a flue gas recycling pipe, a vacuum pump, a waste gas exhausting pipe and a carbon dioxide recycling pipe. According to a carbon dioxide capturing and recycling method, magnesite concentrate powder is smelted under a sub-vacuum condition, carbon dioxide gas in magnesium oxide liquid in the furnace can be forcibly sucked out, splashing cannot be generated during smelting, production safety is guaranteed, the cost is effectively reduced, 90% of the carbon dioxide gas is recycled; and the smelting process achieves positive facilitation effects on carbon recovery, carbon neutralization and clean production.

Description

technical field [0001] The invention belongs to the technical field of non-metallic electric melting smelting, and in particular relates to a sub-vacuum electric melting magnesium oxide smelting and carbon dioxide capture and recovery system and process. Background technique [0002] In recent years, with the rapid development of the international and domestic iron and steel smelting industry, the demand for high-quality refractory materials has also increased, especially the consumption of fused magnesia, but the high-quality raw material magnesite resources in nature Indeed, it keeps decreasing. [0003] With the reduction of high-quality magnesite resources, a new magnesite beneficiation process has been developed in the industry. The raw material for beneficiation is low-grade magnesite that could not be used before, and high-quality magnesite can be obtained through flotation process. Ore concentrate, the magnesium oxide content can reach more than 47.4%, but in the tr...

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Problems solved by technology

[0003] With the reduction of high-quality magnesite resources, a new magnesite beneficiation process has been developed in the industry. The raw material for beneficiation is low-grade magnesite that could not be used before, and high-quality magnesite can be obtained through flotation process. Ore concentrate, the magnesium oxide content can reach more than 47.4%, but in the traditional fused magnesium smelting process, this kind of magnesite concentrate powder must be pelletized before it can be used for smelting, and the cost of pelletizing is generally 200 yuan / ton, the amount of fused magnesia balls per ton is 2.5:1

[0004] The traditional fused magnesia smelting process is to use super-grade magnesite raw ore to be crushed and screened by a crusher to obtain a magnesite lump ore with a particle size of 20mm-80mm, which is energized and heated in the furnace. Since the carbon dioxide generated during the smelting process must be naturally discharged, if If the discharge is not smooth, it will cause splashing, which will cause scalding hazards to the on-site staff. In addition, the bag filter adopts open dust collection, and the carbon dioxide gas discharged from smelting is mixed with air, and the proportion of carbon dioxide gas is not large, which is not conducive to Carbon dioxide recycling, but also caused environmental pollution

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