A theoretical analysis and control study of open-circuit grinding |
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| Authors: | GT Adel AG Ulsoy KVS Sastry |
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| Institution: | 1. Department of Materials Science and Mineral Engineering, University of California at Berkeley, Berkeley, CA. 94720 U.S.A.;2. Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann-Arbor, MI 48109 U.S.A. |
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| Abstract: | Regrinding is an essential step in many mineral processing flowsheets as a final preparatory step for mineral separation. It is normally carried out in open-circuit ball mills or rod mills. Wide fluctuations occurring in the hardness and size distribution of feed materials to regrinding mills result in a nonuniform product fineness and processing inefficiency. Using a previously developed regrinding model, this paper presents the dynamic analysis and design considerations of a control system for open-circuit grinding, using the traditional P-, PI-, and PID-control algorithms. This study shows the utility of simple analysis techniques in designing a mineral process control system with special attention given to the effect of sampling and analysis time on control system performance. |
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