摘要
在矿山的矿石破碎过程中,存在着能耗巨大的弊端,严重阻碍了企业的绿色发展。利用落锤冲击破碎试验,结合微波加热技术,针对含层理面的矿石试件进行冲击破碎试验,并基于岩石剪切破坏角的Coulomb准则,对未经微波照射与经微波照射下,含不同层理倾角矿石的吸收能及碎屑块度分布情况进行了研究。研究表明,随着层理倾角的增大,矿石吸收能呈先降低后增大的趋势,当倾角为90°时,吸收能存在最小值;经微波加热处理后的矿石吸收能E_(WJL)低于未经微波处理的矿石吸收能E_(JL),且在10°～20°时,E_(JL)-E_(WJL)值最大。随着层理倾角的增大,矿石破碎后的平均块度呈逐渐减小趋势,破碎程度加重;经微波预处理后,矿石的平均块度显著降低,破碎程度最高;因冲击破碎后的碎屑尺寸影响,矿石的平均块度与分形维数相关性较弱。研究成果对于矿石破碎中的能耗控制具有一定参考价值。
In the process of ore crushing in mines, there is huge energy consumption, which hinders the green development of enterprises seriously. By using drop hammer impact crushing test and microwave heating technology, the impact crushing test of iron ore specimens with stratified surface were carried out. Based on the coulomb criterion of rock shear failure angle, the absorption energy and fragment lumpiness distribution of ore with different bedding dip angles were studied without and under microwave irradiation. The results show that the ore absorption energy decreases first and then increases with the increase of bedding dip angle. When the dip angle is 90°, the absorption energy has a minimum value. The absorption energy ( E WJL ) of the ore treated by microwave heating is lower than that of the ore without microwave treatment ( E JL ), and the maximum value of E JL - E WJL is obtained at 10°~20°. With the increase of bedding dip angle, the average fragmentation of ore decreases gradually, and the degree of ore broken increases. And after microwave pretreatment, the average size of ore decreases evidently, and the degree of broken is the highest. Because of the impact crushing fragment size, the correlation between the average size and fractal dimension of ore is weak. The research results have certain reference value for energy consumption control in ore crushing.
作者
王晓东
郝家旺
WANG Xiaodong;HAO Jiawang(The 4th Geology Brigade of Hebei Province Bureau of geology &Mineral, Chengde Hebei 067000, China;North China University of Science and Technology, Tangshan Hebei 063200,China)
出处
《有色金属（选矿部分）》
CAS
北大核心
2019年第3期64-68,共5页
Nonferrous Metals（Mineral Processing Section）
基金
河北省自然科学基金项目(E2015209176)
关键词
冲击载荷
微波加热
吸收能
破碎程度
impact load
microwave heating
absorption energy
degree of broken
