Characteristics of Crushing Energy and Fractal of Magnetite Ore under Uniaxial Compression

4th International Conference on Advanced Engineering and Technology

Gao, F.^1,2 ; Gan, D.Q.^1,2 ; Zhang, Y.B.^1,2

College of Mining Engineering, North China University of Science and Technology, Tangshan

063210, China^1

Mining Development and Safety Technology Key Lab of Hebei Province, Tangshan

063210, China^2

关键词: Compression deformation;    Crushing mechanisms;    Deformation mechanism;    Dissipation energy;    Fractal characteristics;    Fractal properties;    Statistical self similarity;    Uni-axial compression;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/317/1/012004/pdf
DOI  :  10.1088/1757-899X/317/1/012004

来源: IOP

【 摘 要 】

The crushing mechanism of magnetite ore is a critical theoretical problem on the controlling of energy dissipation and machine crushing quality in ore material processing. Uniaxial crushing tests were carried out to research the deformation mechanism and the laws of the energy evolution, based on which the crushing mechanism of magnetite ore was explored. The compaction stage and plasticity and damage stage are two main compression deformation stages, the main transitional forms from inner damage to fracture are plastic deformation and stick-slip. In the process of crushing, plasticity and damage stage is the key link on energy absorption for that the specimen tends to saturate energy state approaching to the peak stress. The characteristics of specimen deformation and energy dissipation can synthetically reply the state of existed defects inner raw magnetite ore and the damage process during loading period. The fast releasing of elastic energy and the work done by the press machine commonly make raw magnetite ore thoroughly broken after peak stress. Magnetite ore fragments have statistical self-similarity and size threshold of fractal characteristics under uniaxial squeezing crushing. The larger ratio of releasable elastic energy and dissipation energy and the faster energy change rate is the better fractal properties and crushing quality magnetite ore has under uniaxial crushing.