On Iron Oxide Coolants in the LD Process

Abstract

In the LD process, the operation, using sintered ore, briquet, iron sand, and Marcona pellet as iron-oxide coolants, was investigated about the following items comparing with mill scale operation: slopping conditions, total iron contents in the final slag, dephosphorization and desulphurization during the blowing, the metallic yield, oxygen consumption and. the cooling effects.
This article shows the results obtained from the test blowing charged with the abovementioned coolants.
1) These coolants slightly increase slopping.
2) The addition of iron sand or pellet increases the total Fe content in slag by about 2% respectively, and improves dephosphorization efficiency.
3) The use of briquet reduces desulphurization efficiency.
4) The use of sintered ore, iron sand and pellet lowers the metallic yield by 04%, 1.1% and 0.3% respectively.
5) Oxygen consumption is the same as in the normal operation.
6) The relative cooling coefficients of sintered ore, briquet, iron sand and pellet to scrap are 26, 18, 22 and 28 respectively.
Considering the handling troubles, the cost of these coolants and the amounts of domestic. supply of mill scale, 0k/t-ingot sintered ore and 10 to 15kg/t-ingot mill scale are now used our LD shop.