METHOD FOR RECOVERING MAGNESIUM OXIDE AND AND SILICON OXIDE FROM STEEL MAKING SLAG

摘要

The present invention relates to a method for recovering magnesium oxide and silica using steel slag, and more particularly, to a method for recovering magnesium oxide and silica using iron sulfate slag, comprising the steps of: ammonium fluoride reaction step in which iron sulfate slag is mixed with ammonium fluoride compound; A solid-liquid separation step of mixing and dissolving and filtering solid-liquid separation, a silica recovery step of reacting ammonia water with the filtrate separated through the solid-liquid separation step to recover silica, washing and filtering the recovered silica through the silica recovery step A magnesium hydroxide recovery step of recovering magnesium hydroxide by reacting ammonia water with the solid matter separated through the solid-liquid separation step, and a sintering step of sintering the recovered magnesium hydroxide through the magnesium hydroxide recovery step.The method of recovering magnesium oxide and silica using the steel slag described above can recover magnesium oxide and silica at low cost through the process of circulating ammonium fluoride and ammonia water and is environmentally friendly since the amount of generated wastewater is low.;