Abstract
The key technology in filling mining is the gravity transportation of high‐density slurries, and the filling system design is a significant part of this technology. The filling effect depends on the fluidity of the filling slurry. To investigate the influence of the gradation of tailings on the rheological properties of the filling slurry, this study uses particle size analysis to prepare three types of tailings: powder‐, relatively fine‐, and fine‐grained tailings, which are then mixed in different proportions. The rheological properties of the resulting filling slurries are tested; the viscosity coefficients and yield stresses of the slurries are obtained using the analysis software provided with the MCR102 advanced rheometer that is used to measure the rheological properties of the slurries. The experimental results demonstrate that there is no absolute relationship between the rheological properties of the slurry and the size of the tailings particles, but the rheological properties are related to the gradation of tailings. Lubricating effect is weakened with an insufficient content of powder‐grained particles in the tailings. On the contrary, when the content of powder‐grained particles in the tailings is too high, the viscous substances in the slurry increase. Both of these conditions can increase the friction loss of the slurry.
Highlights
Advances in Civil Engineering had been investigated, and the results show that the early strength of the filling body was related to many factors, such as the filling time, slurry concentration, and different cementing materials [20,21,22]
Wang et al determined the effect of fine fly ash particles on a filling slurry, and it was shown that the slump, divergence, setting time, and compressive strength of the paste firstly increased and decreased with increasing fine gangue rate [24]. e practice of using ultrafine tailings cementing filling technology in a gold mine had been researched and a good filling effect was obtained [25]. e relationship between the fineness content and the fluidity in the slurry tailings particles was analyzed. e experimental results show that the slurry strength increased with the increase of the specific gravity of the fine particles in the tailings [26, 27]
Many studies had investigated the effects of mass concentration and the lime-sand ratio, but relatively few have studied the effect of particle sizes of tailings on the rheological properties of the slurry [28, 29]. e gradation of tailings is described by the particle size distribution of the material, which refers to the percentage of different-sized particles in a granular material. e particle size distribution of the tailings controls the full filling process. e finer particles in the tailings have a smooth surface and play a role in ball lubrication at the contact of the tailings particles, which can effectively reduce the frictional loss between the angular tailings particles [30]
Summary
Advances in Civil Engineering had been investigated, and the results show that the early strength of the filling body was related to many factors, such as the filling time, slurry concentration, and different cementing materials [20,21,22]. Many studies had investigated the effects of mass concentration and the lime-sand ratio, but relatively few have studied the effect of particle sizes of tailings on the rheological properties of the slurry [28, 29]. If the particle size distribution of the tailings in the filling slurry is not suitable, the slurry will segregate in the pipeline, which can cause a series of serious consequences, such as pipe wears and blockages. Different particle size distributions of tailings can cause changes in the rheological properties of the filling slurry
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