转炉炼钢过程中炉渣的岩相特征对转炉的冶炼操作以及炉渣的综合利用都具有重要意义。本文对转炉冶炼过程中炉渣的岩相特征进行了系统研究。结果表明，岩相检验方法可以确定炉渣的矿相组成和分布，把岩相检验和炉渣化学成分、炉渣的相图等知识结合起来可以更全面的认识炉渣的性质。转炉冶炼过程中所形成的游离氧化钙和方镁石是影响钢渣长期不稳定性的主要因素。

Mineralogical morphology of converter steelmaking slag has great significance to smelting operations, as well as to the utilization of steelmaking slag. In this paper, we give the process of mineralogical morphology of steelmaking slag a systematic study. The results show that the mineral composition and distribution of slag can be determined through mineralogical morphology inspection. Combined mineralogical morphology inspection、 composition and phase diagram of slag will display the characters of slag thoroughly. The free calcium oxide and the periclase formed in the converter smelting process are primary factor affect the steel slag long-term unstable.