1 室内物理相似模拟试验
1.1 工程概况
1.2 试验模型设计
1.3 试验材料制备
表2 试验和矿山物料参数Table 2 Experimental and mine material parameters |
| 物料名称 | 品位/% | 容重/(g·cm-3) |
|---|---|---|
| 采场矿石 | 40.11 | 3.782 |
| 实验室矿石 | 40.11 | 3.782 |
| 采场废石 | 15.04 | 3.055 |
| 实验室废石 | 15.04 | 3.055 |
|
1.4 物理模型放矿试验过程
1.5 试验结果分析
表3 物理模型截止品位为23%和20%时的损失贫化指标Table 3 Dilution and loss indexes of physical model with 23% and 20% cut-off grades |
| 截止品位/% | 分段 | 矿石回采率/% | 废石混入率/% | 采出矿石品位/% | 贫化率/% |
|---|---|---|---|---|---|
| 23 | 1 | 57.32 | 37.45 | 30.71 | 23.44 |
| 2 | 73.30 | 48.48 | 27.94 | 30.35 | |
| 3 | 83.19 | 60.16 | 25.01 | 37.66 | |
| 平均值 | 71.27 | 48.69 | 27.88 | 30.48 | |
| 20 | 1 | 60.98 | 42.11 | 29.54 | 26.36 |
| 2 | 75.06 | 54.93 | 26.32 | 34.39 | |
| 3 | 96.62 | 63.09 | 24.27 | 39.49 | |
| 平均值 | 74.55 | 53.37 | 26.71 | 33.41 |
2 PFC颗粒流数值模拟分析
2.1 模型建立
2.2 模拟过程及结果分析
图7 数值模型截止品位为23%的放矿结果Fig. 7 Ore drawing results of numerical model with 23% cut-off grade |
图8 数值模型截止品位为20%的放矿结果Fig. 8 Ore drawing results of numerical model with 20% cut-off grade |
表5 数值模型截止品位为23%和20%时的损失贫化指标Table 5 Dilution and loss indexes of numerical model with 23% and 20% cut-off grades |
| 截止品位 | 分段 | 矿石回采率/% | 废石混入率/% | 采出矿石品位/% | 贫化率/% |
|---|---|---|---|---|---|
| 23% | 1 | 51.43 | 28.21 | 33.03 | 17.66 |
| 2 | 64.06 | 37.25 | 30.76 | 23.32 | |
| 3 | 79.56 | 48.57 | 27.91 | 30.41 | |
| 平均值 | 65.02 | 38.01 | 30.57 | 23.79 | |
| 20% | 1 | 58.43 | 34.29 | 31.50 | 21.47 |
| 2 | 71.30 | 42.71 | 29.39 | 26.74 | |
| 3 | 84.96 | 55.09 | 26.28 | 34.49 | |
| 平均值 | 71.56 | 44.03 | 29.05 | 27.56 |
图9 数值模型截止品位为23%和20%时对应的贫化损失指标对比Fig. 9 Comparison of loss-dilution indexes corresponding to cut-off grade of 23% and 20% in numerical model |
2.3 物理模型和数值模型结果验证
表6 物理模型与数值模型相关性验证结果Table 6 Correlation validation results of physical model and numerical model |
| | | | |
|---|---|---|---|
| | 0.96559 | 0.93237 | 0.0695 |
| | 0.93884 | 0.88142 | 0.0498 |
| | 0.93920 | 0.88209 | 0.0217 |
| | 0.93877 | 0.88129 | 0.0431 |

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