转炉炼钢过程中加锰矿直接合金化提高终点钢水残锰含量这一炼钢新技术，其实质是渣中的MnO与钢水中的C之间的熔融还原，转炉少渣炼钢及终点高拉碳操作是提高锰收得率的必需条件。鉴于我国转炉还无法实现少渣炼钢的现况，本项目提出了将由贫锰矿粉和煤粉压制成的自还原团块在吹炼后期加入转炉以进行直接合金化的方法。由于锰矿与还原剂充分混合且紧密接触，在团块内部氧化锰与内配碳进行高温熔融自还原反应，该反应受转炉渣量和终点钢水碳含量的影响很小。本项目旨在模拟从转炉吹炼结束到出钢完成的几分钟时间内，利用炉内高温条件使贫锰矿含碳团块快速发生自还原，解明自还原团块在转炉熔渣中的锰、铁氧化物的高温熔融自还原机理，查明在高温熔融自还原过程中生成金属的聚集长大行为，探明在高温熔融自还原过程中产物金属锰的挥发特性及其影响因素和抑制措施，为该技术的推广应用提供理论依据。

It is a new steelmaking technology that the manganese ore is directly used as the alloy element to increase residual manganese content of molten steel at the end-point of converter operation. The essence of the technology is the smelting reduction of MnO by carbon dissolved in molten steel. Less volume of steelmaking slag and higher content of carbon at end-point control are the necessary condition in order to improving the manganese yield. At present, BOF steelmaking process can not achieve less slag operation in China. Therefore, this project proposed a technology of direct alloying using self-reduction briquettes made of lean manganese ore mixed with coal powder at the end-point of converter blowing. The manganese ore and coal could be mixed evenly and contact closely on the briquettes. The reduction reaction between MnO and carbon taking place in briquettes is quite fast. And the BOF slag volume and carbon content of steel at end-point of converter have little influence on the self-reduction reaction. The reaction of lean manganese ore containing carbon during the period of blowing end to tapping finish will be investigated in this project. The aims are to interpret the melting self-reduction mechanism of manganese and iron oxides in the converter slag, find out the aggregation and growth behavior during the metal generating process, and verify the volatilization characteristics, its influencing factors and suppression measures of manganese. The results could provide theoretical basis for the popularization and application of the technology.