Study on critical particle size of thixotropic characteristics of full tailings slurry
The flocculation-decomposition of fine-size tailings particles is the fundamental reason for the thixotropy of filling slurry.However,there is little research on the critical particle size of filling slurry that causes the thixotropy.Through thixotropic tests and microstructure evolution tests on filling slurry prepared from tailings with different particle sizes,combined with non-Newtonian fluid theory proposed by Patwardhan,the interaction force of tailings particles was analyzed,and the theoretical value of critical particle size leading to thixotropic performance of full tailings slurry was derived.Finally,the thixotropic model of filling slurry was established.The results show that thixotropy of filling slurry is positively correlated with shear rate,mass fraction and fine particle content of tailings,and the critical value of thixotropy of filling slurry with particle size of 45 μm is obtained by theoretical derivation.When the filling slurry contains particles with particle size＜45 μm and mass fraction≥6%,the filling slurry has obvious thixotropic effect.On the contrary,the filling slurry has no thixotropy.Based on the experimental results,the Hattori-Lzumi theory is used to construct a thixotropic model,and combined with the rheological test results,the thixotropic coefficient of the filling slurry is obtained.
backfilling slurrythixotropic characteristicscritical particle sizethixotropic model
NETL
NSTL
万方数据
维普
