Abstract
We studied on the use of iron sand in the blast furnace.
In the case of pig iron making with a high rate charge of iron sand, it is well known thatpig iron runs out of the slag tapping hole at slagging. Therefore in actual operation, it isnot practicuble to use iron sand in large quantities. Thorough investigation of this problemshows that viscosity of pig iron grows worse with the increase of Ti in pig iron, and stickyiron does not flow out well at tapping, and as the result pig iron surface becomes higherthan the slag tap hole of the furnace and pig iron runs out of the slag tap hole. We studiedhow to decrease Ti content of pig iron and improve iron viscosity, and found that blowingof fines ore through the pig iron layer was the most effective for oxidization (slagging) of Ti in pig iron. As the first step to industrialization of this method, we applied it to thesmall blast furnace (inner volume 50m3) and found that blast furnace operation could bemade successfully even with 50% iron sand charging. This method is being applied for apatent.
