上向分条分层废石充填采矿法试验研究

东大山铁矿倾斜厚矿体主体采矿方法为分段崩落法,分段高度8～10 m,矿石回收率为49.25%～55%,贫化率29.92%～33.37%。研究表明,分段崩落法在该矿应用时存在采切比大、放矿时下盘矿石残留损失大、顶底柱无法回采等一系列问题。针对上述主要问题,提出采用上向分条分层废石充填采矿法。实践表明,新型采矿工艺可将矿石回收率提高到87%左右,贫化率降低到15%左右,有效地延长了矿山服务年限,因而经济效益显著。该工艺对同类矿山有一定的借鉴意义。

Experimental Study of Waste Rock Fill Mining Method with the Upward Slitting Stratification

The main mining method for Dongdashan inclined thick iron ore bodies is with sublevel caving with its sublevel height of 8～10 m. The ore recovery is about 49.25%～55% and the dilution is about 29.92%～33.37%,which have been maintained for many years. Researches showed that there are many problems in the sublevel caving process,such as large rate of mining-cut ratio,huge ore-drawing loss,and unrecovered roof and bottom pillar etc. According to the problems above,the waste rock fill mining method with the upward slitting stratification is put forward. The operation shows that the recovery can be increased to about 87%,and the dilution rate can be decreased to about 15% by the new mining process. Hence,the mine service life is effectively extended,and the economic benefits are significantly improved. The process can be referred by some other similar mines.