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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4992

Title: Settlement in backfill pipelines: its causes and a novel online detection method
Authors: Goosen, P
Ilgner, H
Dumbu, S
Keywords: Deposition velocity
Stationary bed detection
Settled bed measurements
Slurry flow control
Deposition criteria
Backfill pipelines
Backfill pipeline blockages
Issue Date: Mar-2011
Citation: Ilgner, H. 2011. Settlement in backfill pipelines: its causes and a novel online detection method. 10th International Symposium on Mining with Backfill - MINEFILL 2011. Cape Town, South Africa, 21-25 March 2011, pp 187-195
Series/Report no.: Workflow;5885
Abstract: Many predictive models exist for the calculation of the critical deposition velocity for settling slurries and pastes. However, unforeseen variability of backfill operations as well as changing properties of source materials used for a particular backfill recipe may result in unexpected pipeline blockages. Although quality control procedures are often in place to ensure consistency of the backfill recipe, the large number of factors influencing pipeline blockages and their interdependence cannot always be determined reliably. This paper addresses what are considered to be the dominant parameters affecting backfill pipeline blockages. In particular, backfills with low water content and high cement content may undergo significant rheological changes during extended pipeline transportation, which may affect the settling characteristics. Various methods and types of instrumentation are used in laboratories to measure the velocity and flow conditions at the pipe invert, but no simple instrumentation is readily available as an industrial monitoring tool. A novel method to detect the onset of a stationary bed with an all-metal pipe spool is presented. This instrumentation has been shown to detect the existence of a stationary bed at the pipe invert reliably over a wide range of slurry compositions and slurry densities. Its non-intrusive nature makes it an ideal tool for abrasive and coarse backfill types.
Description: 10th International Symposium on Mining with Backfill - MINEFILL 2011. Cape Town, South Africa, 21-25 March 2011
URI: http://hdl.handle.net/10204/4992
ISBN: 978-1-920410-15-5
Appears in Collections:Pollution and waste
Mining and geoscience
Sensor science and technology
Manufacturing science and technology
General science, engineering & technology

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