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An experimental study on the changes in underflow solids fraction and yield stress in paste thickeners by circulation

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  • Received: 12 November 2019Revised: 1 September 2020Accepted: 2 September 2020Available online: 3 September 2020
  • The trouble-free and efficient operation of paste thickeners requires optimal design and cooperation of each component. When the underflow discharging is suspended, alleviating vast torque that the remaining solids within thickeners may place on rakes mainly lies in the circulation unit. In this work, the mechanism of this unit was analyzed and a mathematical model was developed for description of the changes in underflow solids concentration and yield stress. The key parameters of the circulation unit, namely the height and flow rate, were varied to test its performance in the experiments with a self-designed laboratorial thickening system. The results show that the circulation unit is valid in reducing underflow solids fraction and yield stress to a reasonable extent, and the model could be used to describe its efficiency at different heights and flow rates. A suitable design and application of the circulation unit contributes to a cost-effective operation of paste thickeners.
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An experimental study on the changes in underflow solids fraction and yield stress in paste thickeners by circulation

  • Corresponding author:

    Ai-xiang Wu    E-mail: forresearch2018@126.com

  • 1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China
  • 2. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 3. Shandong Taikai Power Electronic Co., LTD, Taian 271000, China

Abstract: The trouble-free and efficient operation of paste thickeners requires optimal design and cooperation of each component. When the underflow discharging is suspended, alleviating vast torque that the remaining solids within thickeners may place on rakes mainly lies in the circulation unit. In this work, the mechanism of this unit was analyzed and a mathematical model was developed for description of the changes in underflow solids concentration and yield stress. The key parameters of the circulation unit, namely the height and flow rate, were varied to test its performance in the experiments with a self-designed laboratorial thickening system. The results show that the circulation unit is valid in reducing underflow solids fraction and yield stress to a reasonable extent, and the model could be used to describe its efficiency at different heights and flow rates. A suitable design and application of the circulation unit contributes to a cost-effective operation of paste thickeners.

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