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| Rheological properties of composite aggregate paste backfill slurry |
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Received:April 11, 2025
Revised:June 08, 2025
Accepted:June 09, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2025.06.008 |
| KeyWord:composite aggregate;paste backfilling;pipeline transportation;rheological parameters;time-dependent characteristics;failure mechanism |
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| 1.Yiliang Chihong Mining Co. Ltd., Zhaotong 657000, Yunnan, China;2.BGRIMM Technology Group Co. Ltd., Beijing 102628, China;3.National Centre for International Research on Green Metal Mining, Beijing 102628, China |
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| Abstract: |
| The stable transportation of paste backfill slurry is a critical technical aspect for the safe and efficient operation of mine backfilling processes, in which the rheological properties of the slurry serve as key intrinsic factors determining the reliability of pipeline transportation. In response to the frequent occurrences of pipeline blockage and bursting in the backfilling process at the Maoping Lead-Zinc Mine, this study systematically analyzes the types of on-site backfilling failures. Samples were taken from the mixer in the backfill station to test parameters such as fluidity and consistency of the backfill slurry under different standing times. A mathematical model for calculating the rheological parameters of the backfill slurry was established based on viscometer test data, revealing the variation patterns of the slurry's rheological properties over time and their impact on transportation failures. The results indicate that the backfill slurry exhibits significant time-dependent characteristics. After standing for 10 minutes, the difference in fluidity between the upper and lower layers of the slurry was minor. However, after standing for 70 minutes, the fluidity difference between the layers increased significantly, with the yield stress of the lower layer being 175.02% higher than that of the upper layer. The stratification and deterioration of fluidity during slurry transportation are identified as the main internal causes of pipeline failures. Improving mixing homogeneity, increasing slurry flow velocity, or optimizing the aggregate ratio can effectively reduce the risk of transportation failures. The research findings provide theoretical support and technical references for the optimization and failure prevention of paste backfilling systems in similar mines. |
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