印度瓦拉纳西市的贝拿勒斯一兴都大学冶金工程系进行了这项研究。研制成的预还原铁粉主要由海绵铁组成，海绵铁被包裹在局部被还原和烧结的氧化铁外壳中。这种粉末的生产工艺大致力：将铁矿粉和煤粉按一定比例混和，其中煤粉是经两次制粉获得，将混和好的原料进一步粉化，再进? The study was carried out by the Department of Metallurgical Engineering at Benares, Hindu University, Varanasi, India. Developed pre-reduced iron powder is mainly composed of sponge iron, sponge iron is wrapped in partially reduced and sintered iron oxide shell. This powder production process is roughly: the iron ore powder and pulverized coal by a certain percentage of mixing, pulverized coal is obtained by two pulverizing, mixing good raw materials further pulverized, and then into?