云磷集团晋宁磷矿2号坑深部矿体开采方法

为确定云南磷化集团有限公司晋宁磷矿2号坑深部矿体的采矿方法,以该矿2号坑深部缓倾斜含软夹层薄至中厚矿体为研究对象,在对其矿体赋存特征、开采工程技术条件、底板及围岩特征综合分析的基础上,采用现场调研、理论分析与方案对比等进行分析研究。结果表明:1实行矿层1、11、12分矿层混合开采,采出矿石混合后,矿石品位可达22.97%,资源回收率高;2对于2号坑这种典型的缓倾斜含软夹层薄至中厚难采磷矿体,采用单一的采矿方法很难获得理想的经济技术指标,对上盘矿层宜采用分段留矿崩落法作为采矿方法,对下盘矿层,由于矿层薄,宜采用浅孔留矿法作为采矿方法。相关结果可为云南磷化集团有限公司晋宁磷矿2号坑及类似条件的磷矿山深部矿开采方法提供参考依据。

Research on the Mining Method of the Deep Ore-body of No.2 Pit of Jinning Phosphate Mine under Yunnan Phosphate Chemical Group

In order to determine the mining method for exploiting the deep ore body of No.2 pit in Jinning Phosphate Mine of Yunnan Phosphate Chemical Group Co.，Ltd.，and taking the deep slowly inclined-thin to medium thick-soft interlayer ore body of No.2 pit in the Mine as the research object，on basis of the field investigation，theoretical analysis and scheme comparison，the comprehensive analysis on the occurrence characteristics of ore body mining engineering，the technical conditions and the bottom characteristics of surrounding rock are made.The results show that:①the mixed mining way of ① seam，①1 seam and ①2 seam should have been carried out，and the ore grade could reach 22.97% with the high resource recovery after mixing the ores.②For the typical hard-to-mining ore body of No.2 pit in Jingning phosphate mine，it is very difficult to obtain the ideal economic and technical index by using a single mining method.The section shrinkage-caving method is the right one to take as the mining method to the hanging wall seam.Duo to the thin seam for the footwall seam，the shallow-hole shrinkage mining is taken as the better mining method.The related results provides certain reference for the deep mining of Yunnan phosphate group corporation and the open pit mining of phosphorus mines under similar conditions.