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现行的地质勘探规范、矿产工业要求参考手册中,矿产工业指标的表示方法上有些值得进一步明确的问题。如全国储委办公室主编的《矿产工业要求参考手册》(1987年)中,关于蓝石棉的矿石品级划分:Ⅱ级品:纤维长度5.5～20mm;Ⅲ级品:纤维长度2.5～5.mm;Ⅳ级品:纤维长度0.7～2.5mm。如果纤维长2.5mm是划Ⅳ级还是Ⅲ级?纤维长5.5毫米是划Ⅲ级还是Ⅱ级? 又如《水泥原料矿床地质勘探规范》中,对粘土质原料的要求(表)是:若硅酸率为2.7或3.5(铝
In the current reference manuals for geological prospecting regulations and mineral industry requirements, there are some problems that need to be further clarified in the indication method of mineral industry indicators. For example, in the “Mining Industry Requirements Reference Manual” (1987) edited by the Office of the National Reserve Committee, regarding the classification of ore grades of blue asbestos: Grade II products: fiber length 5.5 to 20 mm; Grade III: fiber length 2.5 to 5 mm; Grade IV: The fiber length is 0.7-2.5mm. If the fiber length 2.5mm is class IV or class III? 5.5mm fiber class is class III or class II? In the case of the “Geological Exploration Specification for Cement Raw Material Deposits”, the requirements for the clay material (Table) are: Acidity 2.7 or 3.5 (aluminum