利用锰硅合金粉生产低磷中碳锰铁的理论研究与实验

利用锰硅合金破碎产生的残粉作为生产低磷中碳锰铁的主要原材料,通过分析电硅热法(冷装法)生产中碳锰铁存在的问题和产品碳高、磷高的质量状况,提出了“二步法”脱磷、“二步法”脱硅生产中低碳锰铁的新工艺。根据拟定的工艺实验方案,完成了台架实验和现场模拟实验。实验表明：采用脱磷合金和No．3造渣剂,可以实现MnSi合金同时脱磷、脱碳,合金中磷含量降至0．15％、碳含量降至1．40％以下;脱磷合金用量6％～14％,脱磷率约为18．5％～43．1％;低磷富锰渣预脱硅和锰矿终脱硅的“二步法”熔炼工艺能满足生产低磷中碳锰铁的技术要求。

THEORETICAL RESEARCH AND EXPERIMENT FOR PRODUCING MC FERROMANGANESE CONTAINING LOW PHOSPHORUS WITH SILICOMANGANESE POWDER

The main raw materials for MC ferromanganese containing low phosphorus is powder which is producing during crushing silicomanganese, by means of analyzing the problems in produce MC ferromanganese with cold charging and the condition of production containing high carbon, high phosphorus. A new technology of "dual process" in dephosphorization and desiliconization for MC ferromanganese is promoted. According to technology experimental plan, pedestal experiment and imitation experiment on spot have been finished. It shows that silicomanganese can be dephosphorizated and decarbonizated in the mean while the phosphorus content in alloys can be decreased to 0.15%, carbon content can be decreased to 1.40% in silicomanganese with dephosphorization alloy and No.3 slagging flux at the same time, the output of dephosphorization alloy is 6%-14%, dephosphorization efficiency is 18.5%-43.1%, the technological request of producing MC ferromanganese with low phosphorus content" can be satisfied by "dual process" for preliminary desiliconization in manganese-rich slag with low phosphorus content and final desiliconization in manganese ore.