Journal of Northeastern University(Natural Science)

Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (12): 1764-1768.DOI: 10.12068/j.issn.1005-3026.2016.12.020

• Resources & Civil Engineering • Previous Articles     Next Articles

Grinding Kinetics of Anshan Type Hematite Ores in a Ball Mill

CAO Jin-cheng1， LIU Lei2,3， HAN Yue-xin1   

  1. 1． School of Resources & Civil Engineering，Northeastern University， Shenyang 110819， China; 2. Key Laboratory for Polymetallic Ores′ Evaluation and Utilization， Ministry of Land and Resources， Zhengzhou 450006， China; 3. Zhengzhou Institute of Multipurpose Utilization of Mineral Resources， China Geological Survey， Zhengzhou 450006， China.
  • Received:2015-10-20 Revised:2015-10-20 Online:2016-12-15 Published:2016-12-23
  • Contact: CAO Jin-cheng
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Abstract: Grinding specific rate of Anshan type hematite ores was analyzed using MATLAB software. Test results showed that breakage of ore particles in the grinding process went through three inherent stages: rapid grinding of coarse size fraction， dynamic grinding of middle size fraction and single grinding of middle size fraction. Particles in 0.043~0.031mm size fraction went into dynamitic grinding stage earlier than particles in 0.105~0.043mm size fraction， and then overgrinding of fines occurred easily in ball mill. Compared with cone crusher products， HPGR (high pressure grinding rolls) products had significantly shorter turning time points in three breakage stages， which means that HPGR products were ground faster with earlier occurrence of overgrinding. Given this， the increase of HPGR product tonnages into mills shortened the residence time of materials in ball mill， not only improving the capacity of mineral processing plants but also weakening overgrinding of fines.

Key words: high pressure grinding rolls (HPGR), cone crusher, grinding kinetics, grinding specific rate, breakage stages

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