In iron ore/coal compsite,there truely is a soild-soild state direct reduction of iron oxide by carbon before the direct reduction through gaseous intermediate,but the reduction rate is lower.

• 在铁矿／煤混合料中，在借助气体的直接还原开始前，确实存在着碳直接还原铁氧出物的固体间的直接还原，但不能达到有效的反应速度。