摘要
为揭示不规则矿石颗粒冲击破碎能耗规律,采用自主改进的落锤冲击试验机,对6种不同性质的铁矿石开展单颗粒冲击破碎试验,分析不规则铁矿石破碎的分形特征,以及碎块平均粒度、分形维数和单位吸收能的尺寸效应,建立不规则单颗粒矿石冲击破碎的能耗模型。结果表明,在相同的冲击条件下,碎块平均粒度、分形维数、单位吸收能与等球直径均呈幂函数关系,随着颗粒等球直径的增大,碎块平均粒度逐渐增大,分形维数与单位吸收能逐渐降低;单位吸收能与碎块平均粒度呈幂函数增大的变化关系,单位吸收能对数与分形维数呈线性增长的关系;通过不规则单颗粒矿石破碎试验的方法,建立了不规则颗粒单位破碎能关于初始尺寸、碎块平均粒度与分形维数的关系模型,平均相关系数为0.789,较好地描述了矿石破碎能耗规律。
To reveal the energy consumption patterns of irregular ore particles under impact crushing,impact crushing tests were conducted on six types of iron ore with different properties,and the fractal characteristics of irregular iron ore fragmentation were analyzed,as well as the size effect on average particle size of fragments,fractal dimension,and unit absorption energy.Then,the energy consumption model of irregular single particle crushing was established.The results show that the average particle size of fragments,fractal dimension,unit absorption energy all exhibit a power function relationship with initial isosphere diameter under the same impact conditions.As the isosphere diameter of the particles increases,the average particle size of the fragments gradually increases,and the fractal dimension and unit absorption energy gradually decrease.There is an increasing relationship with power function between unit absorption energy and average particle size of fragments.The relationship between the logarithm of unit absorption energy and fractal dimension shows a linear increase.Through the method of ore crushing tests of irregular single ore particle,relationship models of unit crushing energy consumption of irregular iron ore particles changing with the initial size,average particle size of fragments,and fractal dimension were established,with an average correlation coefficient of o.789,which effectively describes the energy consumption pattern of ore crushing.
作者
高锋
郭君
甘德清
许佳宁
邵静静
GAO Feng;GUO Jun;GAN Deqing;XU Jianing;SHAO Jingjing(Department of Scientific Research Work,Shanxi Institute of Technology,Yangquan,Shanxi 045000,China;College of Civil Engineering,Tangshan University,Tangshan,Hebei 063000,China;College of Mining Engineering,North China University of Science and Technology,Tangshan,Hebei 063000,China;Department of Mining Engineering,Shanxi Institute of Technology,Yangquan,Shanxi 045000,China)
出处
《矿业研究与开发》
北大核心
2025年第10期215-223,共9页
Mining Research and Development
基金
山西省基础研究计划资助项目(20210302124135)
山西省高等学校科技创新项目(2021L581)
山西工程技术学院科研启动项目(2021QD-10)。
关键词
矿石破碎
落锤冲击
不规则颗粒
尺寸效应
能耗模型
Ore crushing
Drop hammer impact
Irregular particle
Size effect
Energy consumption model
