Fragmentation mechanism of low-grade hematite ore in a high pressure grinding roll
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- 作者：Zhi-tao Yuan 袁致涛 ; Li-xia Li 李丽匣 ; Yue-xin Han 韩跃新…
- 关键词：high pressure grinding roll ; hematite ; specific pressure ; fragmentation mechanism
- 刊名：Journal of Central South University
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：23
- 期：11
- 页码：2838-2844
- 全文大小：
- 刊物类别：Engineering
- 刊物主题：Engineering, general; Metallic Materials;
- 出版者：Central South University
- ISSN：2227-5223
- 卷排序：23
文摘
The fragmentation mechanism of low-grade hematite ore in a high pressure grinding roll (HPGR) was studied based on the characteristics of comminuted products at different specific pressure levels. The major properties included the reduction ratio, liberation, specific surface energy, and specific surface area. The results showed that the fracture of low-grade hematite ore in HPGR was an interactive dynamic process in which the interaction between coarse particles of gangue minerals and fine particles of valuable minerals was alternately continuous with increased compactness and compacting strength of materials. Within a range of 2.8–4.4 N/mm2, valuable minerals were crushed after preferentially absorbing energy, whereas gangue minerals were not completely crushed and only acted as an energy transfer medium. Within a range of 4.4–5.2 N/mm2, gangue minerals were adequately crushed after absorbing the remaining energy, whereas preferentially crushed valuable minerals acted as an energy transfer medium. Within a range of 5.2–6.0 N/mm2 range, the low-grade hematite ore was not further comminuted because of the “size effect” on the strength of materials, and the comminution effect of materials became stable.