Preliminary Study on Rheological Characteristics of Viscous Fine Tailings Slurry
In order to investigate the rheological properties of viscous fine tailings slurry,a gold mine fine tailings slurry was taken as the study object.Rheometer,pH meter,ICP-OES and Zeta potentiometer were used,the water retention properties and thixotropy properties were studied,the rheological characteristics of viscous fine tailings slurry was analyzed,and the transi-tion from laminar flow to turbulent flow and the relationship between the expansion degree and rheological parameters were dis-cussed.The results show that:① the composition of clay minerals and large specific surface area of fine tailings are important internal factors affecting the water retention,thixotropy,fluidity and laminar-turbulent transition of slurry.② The alkali cation dissolved from clay minerals reduces the zeta potential and decreases the thickness of the adsorbed water film.However,when the adsorbed water film is shared among the fine tailings particles,the attraction is enhanced,which promotes the development of the flocculation network and improves the strength of the flocculation network,and finally increases the amount of water wrapped in the flocculation network.In addition,the larger specific surface area increases the water film area,resulting in an increase in the adsorption water of slurry.③ The larger the clay mineral composition and the larger the specific surface area of the fine tailings,the more difficult it is to restore and rebuild the damaged floc structure,and the more obvious the thixotropy.Thixotropy can be weakened by increasing shear rate and decreasing slurry concentration.④ The fine tailings slurry belongs to"bingham plastic flow",and the clay minerals and larger specific surface area help to maintain laminar flow state of slurry,in-crease yield stress,stiffness coefficient and decrease expansibility.The extensibility is controlled by both yield stress and stiff-ness coefficient,and follows a negative power function relationship.
fine tailings slurrywater-retaining propertythixotropyrheological property
万方数据
维普
