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用人工混合的粗粒和细粒和二氧化硅及磁铁矿(用以模拟脉石)与细粒钨(用以模拟金)的混合样作为给料研究了尼尔森(Knelson)选矿机的选别性能。首先确定了每一种脉石类型的最佳冲洗水流率。然后在最佳的冲洗水流率条件下研究尼尔森选矿机的过负荷问题。对于细粒二氧化硅脉石而言,在所有研究的任何操作条件下都不会产生过负荷的问题。用细粒磁铁矿脉石时过负荷很小,而用粗粒二氧化硅脉石时则产生相当大的过负荷,但用这种过负荷只在已形成明显的钨精矿层之后才产生。对于细粒磁铁矿脉石而言,过负荷的现象比用粗粒二氧化硅时更早地开始产生。用粗粒磁铁矿时几乎立即产生严重的过负荷。应用冲刷精矿床层的一阶动力学速率常数以及发生冲刷时精矿的临界质量来模拟过负荷的产生。研究结果清楚地表明了排除过粗粒度以使尼尔森选矿机的回收率达到最高是至关重要的,当脉石密度较大时这点尤为重要。
The Knelson concentrator selection was studied using artificially mixed coarse and fine grains and a mixed sample of silica and magnetite (used to simulate gangue) and fine grain tungsten (used to simulate gold) as feedstock Do not performance. First determine the best flushing water flow rate for each gangue type. The Nielsen concentrator overload problem was then studied at the optimum flushing flow rate. For fine-grained silica gangue, there was no overloading problem under any operating conditions of all studies. Overburden with fine-grained magnetite gangue is very small, whereas with coarse-grained silica gangue, considerable overloading occurs, but this overloading occurs only after a distinct tungsten concentrate has been formed. For fine-grained magnetite gangue, overloading occurs earlier than with coarse-grained silica. With coarse-grained magnetite, severe overloading occurs almost immediately. Applying the first-order kinetic rate constant of the scouring concentrate bed and the critical mass of the concentrate during scouring simulate the generation of overburden. The results of the study clearly demonstrate the crucial importance of excluding coarse grain so that the Nielsen concentrator recovery is maximized, which is especially important when the gangue density is high.