METHOD OF PRODUCING CIVIL ENGINEERING MATERIAL SUITED FOR SUBBASE COURSE MATERIAL OR THE LIKE FROM CONVERTER SLAG

摘要

PURPOSE:To obtain a civil engineering material suited as a subbase course material by blowing a stirring gas into the molten slag remained in a bottom blown converter, charging a slag modifier thereto and stirring the mixture. CONSTITUTION:Molten steel is tapped from a bottom blown converter which has been completed of blowing, and converter slag is allowed to remain as it is in the furnace. A stirring gas such as oxidative gas like, for example, oxygen or air, or inert gas like N2 or Ar is blown through a plurality of the tuyeres in the furnace bottom, and the bottom blown converter is erected vertically to stir the slag. Thence, a slag modifier such as material contg. SiO2, Al2O3, Fe2O3, etc., for example, gravel, blast furnace slag or the like is charged through the hopper provided on the furnace. After the molten slag is sufficiently stirred to allow the unslagged CaO to melt thoroughly, the slag is discharged to the outside of the furnace. Thereby, the converter slag may be modified to a civil engineering material.