Study on Meso-mechanism of Deep Dewatering of Mine Filling Materials Based on CT Scanning
Aiming at the problems of difficult thickening and dewatering of total tailings and low underflow mass concentration,the deep thickening and dewatering of slurry flocs based on the meso-structure of slurry flocs at different heights of the compressed bed was studied.Through the dynamic thickening experiment of the whole tailings,the slurry sample of the compressed bed layer was obtained.With the help of SEM and high-precision CT scanning equipment,the obtained floc structure was scanned and three-dimensionally reconstructed to analyze the pore structure variation along the direction of the compressed bed layer.The results show that the average pore radius of the five groups of slurry is 9.58 μm,9.23 μm,8.76 μm,8.63 μm and 8.31 μm respectively.The mass concentration of slurry at the top of the bed is 59.4%,and the flocs are loose and irregular.The mass concentration of slurry at the bottom is 62.1%,and the flocs are dense and regular.Compared with the top and bottom slurry,the porosity decreased by 3.7 percentage points,the connected pore ratio decreased by 35.53%,the average coordination number of pores decreased by 22.73%,and the pore connectivity was greatly reduced.This thesis the microscopic pore structure characteristics are quantitatively characterized from the microscopic point of view,which provides a theoretical basis for further dehydration of mine filling materials.
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