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采用特制的脉冲微波设备,研究脉冲微波功率、脉宽、辐照时间对湖南某铅锌矿力学强度的影响规律。铅锌矿经脉冲微波辐照后,矿物内部和外部缺陷明显增多,矿物强度降低很明显,其抗压强度下降值随脉冲微波功率、脉宽、辐照时间的增加而增大。铅锌矿未经微波辐照时抗压强度平均值为9.24 MPa,当微波功率为40 k W,脉宽为1000μs,辐照时长为40 s时,其抗压强度弱化程度最大,抗压强度平均值为5.12 MPa,相比微波处理前下降了44.6%。铅锌矿经相同微波参数辐照后,喷水冷却较自然冷却导致的铅锌矿强度弱化程度更高,其抗压强度平均值为4.35 MPa,比自然冷却强度下降值增加了8.3%,更加有助于铅锌矿强度的弱化。扫描电镜(SEM)分析结果表明:经过微波辐照处理的铅锌矿在有用矿物和脉石间产生了裂纹,能够有效地促进矿物与脉石的解离,导致了铅锌矿强度的降低,有利于后续磨矿的进行。
A special pulse microwave equipment was used to study the influence of pulse microwave power, pulse width and irradiation time on the mechanical strength of a lead-zinc mine in Hunan. After pulsed microwave irradiation, the internal and external defects of lead and lead in lead-zinc mine obviously increase, and the decrease of mineral strength is obvious. The decrease of compressive strength of Pb-Zn ore increases with the increase of pulsed microwave power, pulse width and irradiation time. The average compressive strength of lead-zinc mine without microwave irradiation is 9.24 MPa. When the microwave power is 40 kW, the pulse width is 1000μs and the irradiation time is 40s, the compressive strength is weakened to the maximum. The compressive strength The average value was 5.12 MPa, which was 44.6% lower than that before microwave treatment. Lead and zinc ore irradiated by the same microwave parameters, water jet cooling than natural cooling led to the strength of lead-zinc ore to a higher extent, the average compressive strength of 4.35 MPa, down from natural cooling intensity increased by 8.3%, more Help lead-zinc mine strength of weakening. Scanning electron microscopy (SEM) results show that the lead-zinc mine irradiated by microwave radiation has cracks between the useful minerals and gangue, which can effectively promote the dissociation of minerals and gangue, leading to the decrease of the strength of lead-zinc ore, In favor of follow-up grinding.