Granular charring rice husk thermal insulation agent

Abstract

The invention relates to metallurgy field, in particularly to a granular carbonizing rice husk thermo to insulating agent used in iron and steel melting progress. The invention is characterized in that: the thermo of the insulating agent consists of 45 to 80 percent carbonizing rice husk, 10 to 30 percent binder and 1 to 30 percent filling material. The binder refers to one of or a combination of at least two components among amylum, caustic soda flake, bentonite, white putty waterglass, sodium carboxymethyl cellulose (CMC), phosphoaluminate cement and silicate cement. The thermo-insulating agent contains comparatively high carbonizing rice husk, and effectively bonds the carbonizing rice husk into granule shape while at the same time avoids the adoption of calcareousness and dolomite, so as to preserve insulation property of the thermo-insulating.

Description

technical field [0001] The invention relates to metallurgy, in particular to an insulating agent used in the steelmaking / ironmaking process, a granular carbonized rice husk insulating agent. Background technique [0002] At present, carbonized rice husk powder is commonly used as ladle insulation agent in steel mills. Carbonized rice husk powder is popular because of its good thermal insulation effect and low cost. The high dust content affects the environment and the health of workers. Chinese patent application 00123230.4 introduces a carbonized thermal insulation agent on the surface of granular molten steel. This thermal insulation agent has a low content of carbonized rice husk, less than 50%, and has no other light materials, which causes the specific gravity of the thermal insulation agent to be heavy and affects the thermal insulation effect. Generally, if the content of carbonized rice husk is high, it is difficult to effectively bond it into granules without affec...

AI Technical Summary

Problems solved by technology

[0002] At present, carbonized rice husk powder is commonly used as ladle insulation agent in steel mills. Carbonized rice husk powder is popular because of its good thermal insulation effect and low cost. High dust content, affecting the environment and the health of workers

Chinese patent application 00123230.4 introduces a carbonized thermal insulation agent on the surface of granular molten steel. The carbonized rice husk content of this thermal insulation agent is low, less than 50%, and there are no other light materials, which causes the specific gravity of the thermal insulation agent to be heavy, which affects the thermal insulation effect.

Generally, if the content of carbonized rice husk is high, it is difficult to effectively bond it into granules without affecting the quality of molten steel. Chinese patent application 00110748.8 introduces a round particle molten steel heat preservation agent. It contains a large amount of carbonized rice husk powder, but it also contains more lime powder and dolomite powder as gelling agents. As we all know, lime powder and dolomite powder are materials with strong water absorption, and after absorbing water, they become crystal water. 200℃-300℃ can not be removed at all, if the baking temperature is too high, it may burn the carbonized rice husk material

Therefore, if this kind of round particle molten steel heat preservation agent containing crystal water is added to the surface of molten steel, it will easily cause hydrogenation of molten steel, and the defects of white spots in the slab will cause great losses to the steel factory.