Rheological properties of f ull ta ilings slurry in pipeline transportation based on the hydromechanics theory

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1 Journal of University of Science and Technology Beijing Vol. 31 No. 11 Nov ) 1) 2) 1) 1), ), ,, L. :,.,,,. ; ; ; TD ; O 373 Rheological properties of f ull ta ilings slurry in pipeline transportation based on the hydromechanics theory D EN G Dai2qiang 1), GA O Yong2tao 1), YA N G Yao2liang 2), W U S hun2chuan 1) 1) School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing , China 2) Changsha Institute of Mining Research, Changsha , China ABSTRACT To study the rheological properties of filling slurry, using the principle of hydrodynamics, a gravity flow test through a L2shaped pipe was carried out and the mechanical properties of slurry flow in the pipe was analyzed. The results indicated that the flow resistance and filling rate were depended on slurry concentration, flow rate and pipe diameter, among which slurry concentration was the predominant influencing factor. Under the condition of reasonable filling rates at which the gravity flow of slurry can be achieved, after determining the flow rate and pipe diameter based on filling ability, the slurry concentration can be adjusted in the fill2 ing station to obtain excellent results in transportation, sedimentation, anti2eduction, dehydration and drainage, concretion and me2 chanical properties. KEY WORDS rheological properties ; pipeline transportation ; Bingham fluids ; shear stress,., [1-3 ] ; [4-6 ], ;, [7-13 ],. [12-15 ],.,.,,,.,.,,,, [7-13 ].,,, : : (1974 ),,; (1962 ),,,,E2mail sina. com

2 11 : 1381,,.,,. 1. [7-13 ],,, = 0 + d v d r (1),, Pa ; 0, Pa ;, Pa s; d v/ d r,s - 1., 1. : d p r 0 = 2 0 d l - 1 = 2 0 i, i, Pa m - 1. (6), :R > r 0, ; R r 0,,. 0,,,,.,,,., : 8 V D = (7) 0 /, : = V (8) D 1 Fig. 1 Force analysis of Bingham fluids in a pipeline d p d l r, : : (1) (3) : ( p + d p)r 2 = pr 2 + 2r d l (2) = d p r 2d l (3) d v d r = 1 d p r - 2d l 0 (4) r,r = R, V = 0, : V = 1 1 d p 4 d l ( R 2 - r 2 ) - 0 ( R - r) (5),d p, MPa ; R, m, V,m s - 1. r :r = 0,,, ; r = R,,,. (4) d v/ d r = 0, r, D, m., : 0 = h 0 D 4 ( h 0 + L ) (3-4 0) D = 24 V (9) (10),,t m - 3 ; V,m s - 1 ; h 0, m ; L, m ; 0, Pa ;, Pa s., : i = D + 32V D 2 (11), H, L, : H = i ( H + L ) + n i = 1 i V g +V 2 g (12), H i ( H + L ) n i = 1 i [ V 2 ( 2 g) - 1 ] V 2 (2 g) - 1., 15 %,:

3 : H = 1115 i ( H + L ) (13) H + L H = 1115 i (14) ( H + L ) / H, ,.,, L. 212.,.,1.. V, 2. V = Q/, Q, m 3 h D2 (15) 1 Table 1 Testing data of full tailings slurry s flowing properties /,,,,, / % mm / (t m - 3 ) h 0 / m V / (m s - 1 ) 0 / Pa / ( Pa s) Table 2 Flow velocity of slurry at different pipe diameters and fluxes / (m 3 h - 1 ) / mm m s , :,, ;,,.,,.. 1,,. : 76 % ; 74 % 40 m 3 h mm 1104 ; 72 %70 %,, 3. 3 :,, ;,,.,,,. :,,,,, ;,.,2 3,,,,.

4 11 : : (a) 70 % ; (b) 72 % ; (c) 74 % ; (d) 76 % Fig. 2 Change of slurry s transportation resistance with pipeline diameter and flux. Its mass fraction is (a) 70 %, (b) 72 %, (c) 74 %, and (d) 76 %, respectively 3. : (a) 70 % ; (b) 72 % Fig. 3 Change of slurry s flow rate with pipeline diameter and flux. Its mass fraction is (a) 70 % and (b) 72 %, respectively 3 (1),.,,,. (2),,. 0,.,,,. (3) i 0 V D,,,. 70 %72 %,,,.. [ 1 ] Xiao S X, Gao Z M, Huang X B. Experimental study and numer2 ical simulation of new a modified Ross static mixer. Chin J Pro2

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INFLUENCE OF CONCENTRATION AND ADDITIVES ON RHEOLOGICAL PROPERTIES OF COAL WATER SLURRY

18th International Conference on TRANSPORT AND SEDIMENTATION OF SOLID PARTICLES 11-15 September 217, Prague, Czech Republic ISSN 867-7964 ISBN 978-83-7717-269-8 INFLUENCE OF CONCENTRATION AND ADDITIVES