Abstract
Cemented tailings backfill (CTB) is mainly made with tailings, binder and water, and it commonly flows through pipeline into mined-out areas for the support of rock. The grain composition of tailings can notably affect the workability and strength of CTB. As a result, this study aims to utilize hydraulic cyclone to optimize the particle size distribution of the tailings that are used to prepare the CTB, according to four gradation yields. The settlement properties, bleeding rate, slump and rheology of the fresh CTB are investigated, and the uniaxial compressive strength of the hardened CTB is also measured. The obtained outcomes indicate that the tailings gradation can remarkably improve the workability and strength of the CTB. The gradation yield of 50% is regarded as the optimal value for grading the tailings. This study is expected to provide contributions for improving the CTB performance, in terms of optimizing the tailing grain composition by the hydraulic cyclone.
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