Practice of Reducing Refractory Material Consumption in BOF

TAN Xiyang; WANG Haihua; QUAN Yong; CUI Hui; ZHANG Jiayan; LEI Zhongxing

Abstract：Reducing the refractory consumption per ton liquid steel in the converter is key indicator of advanced smelting technologies.This article elaborates on the current situation of high refractory consumption per ton liquid steel in the 210 ton converter of a domestic steel plant.Optimization practices and applications are conducted from aspects such as optimization of the bottom profile,reasonable refractory matching,and control of the converter slag.It is shown that for the flat-bottomed converter shell of this steel plant,designing the refractory working layer as a flat for the flat-bottomed converter shell of this plant can slow down the erosion rate of the bottom center.Furthermore,increasing the thickness of the refractory working layer from 800 mm to 1 000 mm and altering the bottom profile can prolonged the full campaign life of the converter.The average erosion rate of the bottom in full campaign has been decreased by 22.7％.For converter smelting of low-carbon steel,reducing the carbon content of magnesia carbon bricks at the bottom and tap-pad can slow down the erosion.Properly adjusting the basicity and MgO content of the final slag of the converter and increasing the proportion of slag splashing in the entire furnace can effectively reduce converter maintenance.After adopting a series of measures such as optimizing the bottom furnace type,reasonable matching of refractory materials,and controlling the final slag of the converter,the total maintenance consumption of the converter has been decreased by 0.13 kg/ton of steel.