Key Laboratory for Polymetallic Ores Evaluation and Utilization

Zhengzhou, China

Key Laboratory for Polymetallic Ores Evaluation and Utilization

Zhengzhou, China
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Liu L.,Zhengzhou Institute of Multipurpose Utilization of Mineral Resources CGS | Liu L.,Key Laboratory for Polymetallic Ores Evaluation and Utilization | Liu L.,China National Engineering Research Centerer for Utilization of Industrial Minerals | Tan Q.,Zhengzhou Institute of Multipurpose Utilization of Mineral Resources CGS | And 8 more authors.
Physicochemical Problems of Mineral Processing | Year: 2017

We comparatively studied the ball mill grinding characteristics of comminuted hematite products using a high-pressure grinding roll (HPGR) and a conventional cone crusher (CC). The major properties, including grinding kinetics and technical efficiency (Et), were investigated. The parameters in m-th order grinding kinetics were analyzed, and grinding specific rates were visualized. Ore particles experienced three inherent stages in ball grinding mills, that is i) rapid grinding of coarse fraction, ii) dynamic grinding of medium size fraction, and iii) single grinding of medium size fraction. Particles with size -0.043+0.031 mm were used into dynamic grinding stage earlier than particles -0.105+0.043 mm, and then over-grinding of fines occurred easily. Compared with CC products, HPGR products had significantly shorter turning time points in three breakage stages, implying that HPGR products were ground faster with earlier occurrence of fines over-grinding. HPGR products gave lower Et at a decreasing rate than the CC products for -2.0 mm and -0.5 mm feeds. Then, it showed a slightly higher value of Et for -2.0+0.5 mm feed. This indicated that fines over-grinding in HPGR full-size products were more serious under the condition of coarse grinding, whereas the efficiency was higher, and over-grinding weakened significantly in HPGR coarse products because of screening-out fines.


Liu L.,Chinese Academy of Geological Sciences | Liu L.,Key Laboratory for Polymetallic Ores Evaluation and Utilization | Cao J.-C.,Chinese Academy of Geological Sciences | Cao J.-C.,Key Laboratory for Polymetallic Ores Evaluation and Utilization | And 8 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

In consideration of overgrinding in grinding process, the grinding technical efficiency (Et) of comminuted hematite products using a high-pressure grinding roller (HPGR) and a conventional cone crusher (CC) were comparatively studied. Compared with CC products, individual size distributions (ISDs) in HPGR product show a more significant "double-peak" characteristic. The results show that HPGR products are finer and have a wider full-size distribution because of the greater proportion of fines. HPGR products need a shorter grinding time and have a lower relative grindability. HPGR products have a lower Et at a decreasing rate than the CC product for feeds of <2.0 mm and <0.5mm size fractions, and then show a slightly higher Et for the feed of 0.5-2.0 mm size fraction. Based on the above research, a new process of ultra-crushing in HPGR-classified grinding is advanced. The new comminuting process is adopted to reduce ores tonnage into first stage ball mill significantly, improve grinding efficient and weaken overgrinding in the whole grinding process. ©, 2015, Central South University of Technology. All right reserved.

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