The practice of using LT dust and BOF slag as hot metal dephosphorizing fluxes at Baosteel

摘要

In order to meet the requirements for environmental protection and achieve sustainable development for the steel industry,Baosteel's secondary resources should be utilized in production.Hot metal dephosphorizing factors are analyzed and the practice of a dephosphorizing agent for molten iron pretreatment with LT dust and BOF slag is introduced.Experimental results show that LT dust and BOF slag can be substituted for traditional raw materials,such as sinter and quicklime,etc in molten iron dephosphorization.The proper addition of LT dust or BOF slag and the proper control over basic agents,oxidizing agents and fluxes can achieve the same effect as traditional dephosphorizing agents.BaO can reduce the activity of P_2O_5 and form stable dephosphorizing products.Using a BaO dephosphorizing agent as a kind of harmless dephosphorizing agent will be one of the trends of molten iron dephosphorization.