自然崩落法漏斗放矿规律三维模拟

为了优选自然崩落法低损贫的放矿方案,引进REBOP软件开展镍矿下盘、上盘及中部多排漏斗放矿规律三维数值模拟及损贫预测。结果表明,3种方案均匀放矿30 d后放矿点上方均形成近70 m的移动单元体及超30m的放矿单元体。矿体下盘、上盘及中部放矿时平均出矿率依次为85.6%、85.4%及85.7%,出矿品位依次为0.56%、0.43%及0.47%。此外,下盘放矿时极限放出矿量及放出矿石品位均优于其他方案,且放矿周期内矿石品位均达到设计品位,故优选为最佳放矿方案。

Three-dimensional Simulation of Hopper Ore Drawing Regularity in Natural Caving

To obtain an optimized ore-drawing scheme with low ore loss and dilution in natural caving,the software REBOP was introduced to conduct three-dimensional simulation and loss-dilution prediction of multiple hopper drawing with regard to hanging wall,footwall and medium drawing in nickel mine.Results showed that an Isolated Movement Zone (IMZ) of nearly 70 m in height and an Isolated Extraction Zone (IEZ) of higher than 30 m were formed at drawing points after uniformly ore drawing for 30 days under three schemes.The ore-drawing percentages of hanging wall,footwall and medium drawing were sequentially 85.6%,85.4% and 85.7%,while the drawn ore grades were sequentially 0.56%,0.43% and 0.47%.Additionally,the maximal drawn ore volume and the ore grades of footwall were higher than that of other schemes,and drawn grades throughout the production period reached the designed grades,therefore the footwall drawing was selected as the optimized ore drawing scheme.