Research on the Rheological Properties of High-Density Filling Slurry Added with Gobi Sand-Rod-Mill Tailings Based on RSM.

In order to analyze the rheological properties and viscosity effects of gobi sand-rod-mill tailings filling slurry, the optimal pipeline transport parameters were obtained. Particle size grading analysis was carried out for gobi sand and rod-mill tailings with different particle sizes in the Jinchuan mining area, and the optimal mixing ratio of gobi sand and rod-mill tailings was determined by an experimental method. A high concentration of slurry was prepared for gobi sand and rod-mill tailings with different particle sizes. Rheological parameters were obtained by rheological experiments, and the influence of the response surface method on the rheological characteristics of slurry was analyzed. The results show that the gobi sand-rod-mill tailings filling slurry meets the industrial requirements of the filling slurry, and the rheological model of the slurry conforms to the Herschel-Bulkey model. Mass concentration, cement content, and ratio all significantly influence slurry viscosity, and the influence of mass concentration is the most significant. Based on multivariate analysis, a nonlinear model of viscosity was established with high accuracy, and the correlation coefficient reached 0. 967. Combined with the backfill strength experiment results, the optimal filling slurry concentration was determined to be 82% - 83%, which provided theoretical support for the follow-up pipeline design of filling slurry. [ABSTRACT FROM AUTHOR]