Basic oxygen steel making process using caustic soda - introduced as reaction prod. with lime-bearing material

摘要

The flux is obtd. by reacting an aq. soln. of caustic soda with a lime bearing material at a temp. sufficient to complete the reaction, followed by reduction of the prodn. to particulate form, which is used as the only source of NaOH in the steel making process. The particles may form 2-15% of the total flux, possibly partially replacing fluorspar; the furnace lining may contain MgO. Pref. the flux is made by reacting a soln. contg. >50 wt. % NaOH with a lime-bearing material in a molar NaOH; CaO ratio of 2-6:1 at a temp. between 60 degrees C and the m.pt. of NaOH.