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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. Source

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