云磷集团晋宁磷矿2号坑深部矿体开采方法

摘要

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 com-parison,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 phos-phate group corporation and the open pit mining of phosphorus mines under similar conditions.%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。