The material source of the Carboniferous karst type bauxite in North China mainly came from the underlying Late cambrian-middle Ordovician carbonate rock.
华北石炭纪岩溶型铝土矿的主要物质来源为下伏的晚寒武世—中奥陶世碳酸盐岩。
The authors suggest that the main material source of bauxite is originated from its underlying Ordovician limestone.
本文认为孝义铝土矿物质来源主要是下伏奥陶系灰岩。
Using fired bauxite and silicon carbide as main material, adding suitable amount of carbon based material, binder and other additive, the gunning mix for trough of blast furnace was developed.
以一级矾土熟料和碳化硅为主要原料，配以适量的碳质材料、复合添加剂等，研制出适用于中小型高炉出铁沟的快速修补用喷补料。
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