China Nonferrous Metallurgy

Steel slag is a by-product produced in the steelmaking process, which contains a variety of useful components. However, at present, steel slag is mainly used for steel slag brick, subgrade material and waste water treatment in China, and the effective components in steel slag are not re-used. The calcium base in steel slag, where its content is 40%-60%, plays a positive role in the preparation of industrial grade calcium carbonate products. Therefore, the study on calcium component extraction technology of steel slag is of great significance to the comprehensive utilization and carbon reduction of steel slag. The paper focused on the calcium component leaching treatment technology of steel slag at home and abroad, mainly including deionized water leaching method, acid leaching method and ammonium salt leaching method. The paper briefly described the research progress of calcium component extraction technology from steel slag in China in recent years, compared the advantages and disadvantages of several mainstream leaching methods, makes simple suggestions on the limitations of its current technology and prospects the future development direction.