Rheological properties and pipeline transportation of cemented waste rock backfill slurry

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0023

Abstract

Abstract:

To optimize the mine filling process and improve safety and control costs, the backfill slurry prepared from mine waste rock, cement, and water was taken as the research object. An ICAR rheometer was used to carry out rheological tests, and the effects of waste rock particle gradation, ash/waste ratio, and slurry mass concentration on rheological properties were analyzed. Then, a numerical simulation was performed based on ANSYS-FLUENT software. The results show that the yield stress and plastic viscosity of the slurry increase significantly with the increase of the waste rock particle size, the decrease of the ash/waste ratio, or the increase of the mass concentration. Among them, for every 1% increase of the concentration, the yield stress increases by about 10%, and the increase of the viscosity shows a slow and then rapid trend. The resistance loss of the pipeline approximately decreases linearly with the increase of the pipe diameter. The slurry flow rate in the vertical pipeline is accelerated continuously due to gravity. There is a significant change in flow rate in the elbow section, and the distribution of flow rate in the horizontal section is characterized by a feature: higher at the bottom and lower at the top. The overall maximum value is located in the center of the lower region.

Key words: waste rock, backfill slurry, rheological property, pipeline transportation, numerical simulation

CLC Number:

X936

LI Lei, WU Di, YANG Guanding. Rheological properties and pipeline transportation of cemented waste rock backfill slurry[J]. China Safety Science Journal, 2025, 35(S2): 29-35.

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影响因素	试验序号	废石粒径/ mm	灰废比 (水泥∶废石)	料浆质量浓度/%
废石粒径	A₁	-10	1/8	80
	A₂	-15
	A₃	-20
灰废比 (水泥∶废石)	B₁	-15	1/6	80
	B₂		1/7
	B₃		1/8
	B₄		1/9
	B₅		1/10
料浆质量浓度	C₁	-15	1/6	78
	C₂			79
	C₃			80
	C₄			81
	C₅			82

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