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| The effect of temperature on the rheological properties of cemented phosphogypsum backfill slurry |
| Received:November 26, 2017 Revised:January 11, 2018 |
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| DOI： |
| KeyWord:temperature; yield stress; viscosity; resistance loss |
| Author | Institution |
| HeJiang |
中南大学资源与安全工程学院 |
| Li Diyuan |
中南大学资源与安全工程学院 |
| Li Xi Bng |
中南大学资源与安全工程学院 |
| Shi Yng |
中南大学资源与安全工程学院 |
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| Abstract: |
| This work is aiming to investigate the response of the rheological parameters of cemented phosphogypsum backfill slurry to the changes in temperature with the help of the temperature controlled water bath and rheometer. The measurement results showed that the shear stress and shear rate quite well fitted to the Hershel-Bulkley model. When the temperature of backfill slurry reached 10 ℃, the value of yield stress increased with solid concentration, but the increasing rate was relative lower in the case of solid concentration below 58 wt%. This increasing rate can be effectively improved with rising of temperature. Furthermore, both yield stress and viscosity increased with the rising of temperature, which means the internal structure of backfill slurry has been strengthened. The resistance loss of cemented phosphogypsum backfill slurry flowing through the pipes was calculated by assuming the slurry flow in laminar regime, which found that the resistance loss value also increased with temperature. By comparing the resistance loss values in different flowing conditions, increasement of slurry average flowing velocity helps to increase the resistance loss value caused by the rising temperature, but the increase rate get more slowly. |
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