下古生界朱砂洞组石灰岩综合开采利用——以汝州–登封一带为例
Comprehensive Exploitation and Utilization of Limestone in Zhushadong Formation of Lower-Paleozoic—A Case Study of Ruzhou-Dengfeng Area

下古生界寒武系朱砂洞组(∈₁z)主要赋矿岩石用途为水泥用灰岩、黑色冶金熔剂用灰岩、建筑石料用灰岩。水泥用灰岩矿石的化学成分主要为CaO、MgO，有害元素SiO2均小于4%，Al₂O₃含量均小于0.5%，TFe₂O₃含量均小于0.25%，K₂O + Na₂O均小于0.2%，SO₃、Cl、Mn₃O₄、P₂O₅含量均小于0.1%；黑色冶金熔剂用灰岩矿石的化学成分主要为CaO、MgO，有害成分：SiO₂含量均小于4%，Al₂O₃含量均小于0.5%，TFe₂O₃含量均小于0.35%，K₂0 + Na₂O均小于0.3%，SO₃、Cl、Mn₃O₄、P₂O₅含量均小于0.1%。水泥用灰岩(III)矿体位于上部，黑色冶金熔剂用灰岩(VIII)位于水泥用灰岩(III)体下部，并含有不能满足工业品位的夹石。单独矿种露天开采，矿石量较少，并不满足剥采比不大于0.5:1的要求。两种矿体综合利用共同开采，满足剥采比不大于0.5:1的要求，具有开采经济性。
The lower-Paleozoic Cambrian Zhushadong Formation (∈₁z) is mainly used as the host rock for cement limestone, black metallurgical flux limestone and construction stone limestone. The chemical composition of limestone ores used for cement is mainly CaO and MgO, with harmful elements SiO₂ less than 4%, Al₂O₃ content less than 0.5%, TFe₂O₃ content less than 0.25%, K₂O + Na₂O content less than 0.2%, SO₃, Cl, Mn₃O₄, P₂O₅ content less than 0.1%. The chemical composi-tion of limestone ores used for black metallurgical flux is mainly CaO and MgO, and the harmful components are SiO₂ content less than 4%, Al₂O₃ content less than 0.5%, TFe₂O₃ content less than 0.35%, K₂O + Na₂O content less than 0.3%, SO₃, Cl, Mn₃O₄, P₂O₅ content less than 0.1%. The cement limestone (III) orebody is located in the upper part, and the black metallurgical flux limestone (VIII) is located in the lower part of the cement limestone (III) orebody, and contains the inclusion stone which cannot meet the industrial grade. Single ore open-pit mining, ore quantity is less, does not meet the stripping ratio of less than 0.5:1 requirements. The two ore bodies can be exploited together by comprehensive utilization, which meets the requirement of stripping ratio not more than 0.5:1 and has economic exploitation.