富氧密闭鼓风炉
oxygen enrichment closed-top blast furnace
高炉鼓风机
BF fan
BF air-blower
blast furnace blower
BF blower
blast furnace blowing engine
blast-furnace blower
Air blower of blast furnace
blast furnace electric air-blower
blower for blast furnace
鼓风炉还原
Blast furnace reduction
Reduction with blast furnace
鼓风炉炼铅
lead smelting in blast furnace
lead smelting by blast furnace