Abstract:The technology and research of converter steel slag dephosphorization and the existing problems are introduced. On the purpose of recycle high-grade phosphorus resource, melting upgrading treatment of converter steel slag in order to achieve the full enrichment of phosphorus in slag and promote the formation of large high-grade phosphate-rich crystalline phase is discussed based on the analysis of phosphorus occurrence. The method is of great significance to the promotion of energy conservation and emission reduction as well as the efficient and comprehensive utilization of metallurgical slag.