摘要
为了研究含层理矿石微波加热后的冲击破碎特性,采用落锤冲击破碎系统、微波加热设备和高速摄影技术,对含层理矿石进行微波加热后冲击破碎试验,系统地研究层理倾角对矿石动态强度的影响,分析经微波照射后含层理矿石力学性能。结果表明:在层理倾角10°~60°时,矿石动态强度逐渐降低,在层理倾角>60°~90°时,矿石动态强度逐渐升高;相同层理倾角下,经微波加热后的矿石与未经微波加热的矿石相比,其强度显著降低且矿石异性比略有增加;当层理倾角60°时,2种情况下的矿石动态强度均最小,表明矿石沿层理面破坏是以剪应力为主导的。研究成果可为选矿厂破碎含层理矿石的相关工艺流程设计提供参考。
In order to study the impact crushing characteristics of bedding ore after microwave heating,the impact crushing tests of the ore-bearing ore were carried out by using the drop hammer impact crushing system,microwave heating equipment and high-speed photography technology.The influence of the bedding dip angle on the dynamic strength of the ore was systematically studied,and the mechanical properties of bedded ore irradiated by microwave were analyzed.The results showed that the ore dynamic strength decreased gradually when the bedding angle was between 10°and 60°.When the bedding angle was between 60°and 90°,the ore dynamic strength increased gradually.At the same bedding dip angle,the strength of microwave-heated ore was significantly lower than that of non-microwave-irradiated ore,and the ore anisotropy ratio slightly increased.When the bedding dip angle was 60°,the ore dynamic strength was the smallest in both cases,which indicated that the failure of ore along the bedding plane was dominated by shear stress.The research results could provide some reference value for the design of relevant process flow of the selected crushing bedding ore.
作者
程豪杰
李占金
郝家旺
甘德清
杨铭
CHENG Haojie;LI Zhanjin;HAO Jiawang;GAN Deqing;YANG Ming(College of Mining Engineering,North China University of Science and Technology,Tangshan 063000,Hebei,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2020年第6期16-22,共7页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(51374087)
河北省自然科学基金资助项目(E2015209176)。
关键词
层理结构面
落锤冲击
矿石破碎
微波加热
动态强度
bedding structural surface
drop hammer impact
crushing ore
microwave heating
dynamic strength
