前言 新西兰钢铁公司的SL/RN回转窑法的发展,清楚地表明了把使用煤的直接还原法扩大到工业规模时所遇到的各种问题。因为是固态还原,所以应当避免反应物和产物的熔融。但是由于矿石中的氧化铁、脉石和还原剂中的灰份能形成低熔点的物质,常常粘结在耐火炉衬上或者在反应料层里产生结块。这就是用煤直接还原法在大设备操作中所要克服的主要困难。 Preface The development of New Zealand’s SL / RN rotary kiln method clearly shows the problems encountered when extending the direct reduction of coal to industrial scale. Because it is a solid state reduction, melting of reactants and products should be avoided. However, due to the iron oxide in the ore, gangue and reducing agent in the ash can form a low melting point of the material, often bonded to the refractory lining or lump in the reaction bed. This is the major difficulty to be overcome in the operation of large equipment with direct coal reduction.