摘要
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。
The influence law of pulse microwave power, pulse width and exposure time on the mechanical strength of a lead-zinc ore in Hunan with special-made heating device with pulse microwave was studied. After irradiated by pulsed microwave, the internal and external defects of lead-zinc ore increased significantly, the strength of ore decreased obviously and the decreased value of compressive strength increased with the increase of the pulse microwave power, pulse width and exposure time. The average of compressive strength of lead-zinc ore was 9.24 MPa before microwave. When the microwave power was 40 kW, the pulse width was 1000 μs, the irradiation time was 40 s, the decreasing degree of the compressive strength was the maximum, and the average of compressive strength of lead-zinc ore was 5.12 MPa, which decreased by 44.6% compared with that of no microwave irradiation. After irradiated by the same pulsed microwave parameter, the weakening degree of compressive strength by water quenching was greater than that of natural cooling, and the average of compressive strength of lead-zinc ore was 4.35 MPa, the decrease value of which increased by 8.3% than that of natural cooling, so water quenching was more beneficial to the deterioration of the strength of lead-zinc compared with natural cooling. Scanning electron microscope （SEM） analysis showed that it generated the fractures between useful minerals and gangue after micro- wave irradiation treatment of lead-zinc ore, which could promote the mineral liberation from gangue effectively, thus caused a reduction in the strength of lead-zinc, and it would be conducive to the subsequent grinding.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2016年第11期1154-1160,共7页
Chinese Journal of Rare Metals
基金
国家自然科学基金重点项目(U1401231)
湖南省教育厅项目(13C800)
衡阳市科技局项目(2013KS31)
南华大学创新训练中心校级项目(2014-12)
南华大学创新团队项目(CNHCXTD04)资助
关键词
铅锌矿
微波辐照
破碎
力学强度
lead-zinc ore
microwave irradiation
crushing
mechanical strength
