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- Addie, Graeme, et al.
(författare)
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Pipeline design characteristics of some industrial paste-like slurries
- 2005
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Ingår i: Conference Proceedings - First Extractive Metallurgy Operators' Conference. - : The Australian Institute of Mining and Metallurgy. ; , s. 147-154
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Konferensbidrag (refereegranskat)abstract
- There is a wide variety of industrial pastes or non-settling slurries pumped in mining, dredging and reclamation projects as products, refuse and tails. The types and/or names of some of the common ones are alumina red mud, phosphate clays, tar sands mature fine tails, tar sands (CT) consolidated clays and fly ash. The pipeline performance or friction of these varies dramatically with the type, its concentration and the particulars of the actual slurry making it difficult to select pumping equipment and to design associated pipelines. The GIW Hydraulic Laboratory in Grovetown Georgia has tested a number of these slurries over the last 30 years for various mining customers. Where available in the public domain and/or where permission has been obtained, the results of those tests are presented in this paper in a form usable for pipeline and pump system designers and users.
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- Furlan, J., et al.
(författare)
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Pipe loop testing of a mixture containing fine, dense solids with magnetic properties
- 2019
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Ingår i: 19th International Conference on Transport & Sedimentation of Solid Particles. - : Wydawnictwo Uniwersytetu Przyrodniczego we Wrocławiu (Wrocław University of Environmental and Life Sciences). ; , s. 23-29
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Tests were performed in the GIW Hydraulic Laboratory on a milled copper slag tailings slurry in pipe loops with 75 and 100 mm diameter loss sections. Volumetric concentrations of 1 to 14% were tested in the 100 mm loop, and the initial results, derived using magnetic flow meter measurements, showed pressure losses approximately equal to that of water. Chemical Testing of the solid particles was performed, and they were found to be made up of 56% magnetite by weight. Magnetite has been found in the past (Sonar Trac paper) to effect magnetic flow meter measurements, which was the primary method being used in this test program. Secondary measurements using a Sonar Trac instrument indicated, in contrast, the more common and expected equivalent fluid behavior in the 4” loop at the lower concentrations, where the losses, when expressed in height of slurry, now landed on top of the carrier liquid curve, which was found to be equal to that of water. A comparison between the measurements from the magnetic flow meter, and those from the sonar trac, showed a linear dependency between the flow rate ratio (between the magnetic flow meter measurement and the sonar trac measurement) and the solids concentration. These tests illustrate the importance of having knowledge of the makeup of the solid particles in a slurry, and the utility of acoustic based flow rate measurement methods in cases where magnetite (or other solids particles with magnetic properties) particles are present within the slurry.
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- Sellgren, Anders, et al.
(författare)
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Prediction of slurry pump component wear and cost
- 2005
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Ingår i: Proceedings, WEDA XXV and Texas A& M Annual Dredging Seminar. - : Western Dredging Association.
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Konferensbidrag (refereegranskat)abstract
- Slurry pumps are used for the transportation of solids in coal, copper, iron ore, phosphate and in other mining operations. They are also used on dredges cleaning waterways, in environmental cleanup and in reclaiming land throughout the world. Slurries by their very nature are very abrasive requiring the impeller, casing and suction liner wet end component parts be replaced at regular intervals. It is not uncommon, for example, for six liners, three impellers and two casings to be consumed in one year. It is estimated that about $500 million in slurry pump wear parts are consumed every year. Numerical models now exist to predict component wear for a given set of operating conditions with a given design. The use of these models is however available to a select few and no general relations exist for the user. The writers in this paper model a selection of pump designs producing general relationships for the different pump casing, impeller and liner components for different duties. They then take these and show which offer the lowest cost of ownership for different services.
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- Sellgren, Anders, et al.
(författare)
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Pump and pipeline performance when pumping slurries with different particle gradings
- 2014
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Ingår i: 19th International Conference on Hydrotransport 2014. - 9781634394444 ; , s. 131-143
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Konferensbidrag (refereegranskat)abstract
- A pipeline slurry friction loss model consisting of three regimes was initially proposed by K.C. Wilson in Wilson and Sellgren (2001), then extended to a four components consisting of fluid, pseudo-homogeneous, heterogeneous and fully stratified regimes, Wilson et al. (2006). The weighting technique using up to four regime related components often works well for friction loss estimations based on simple input data and model parameters. This also holds for the ANSI/HI (2011) pump performance derating procedure for settling slurries. The comparisons and discussion focus on coarse particle slurries and some cases where the modelling estimations for pipeline and pump performance were not particularly accurate.--------------------------------------------------------------------------------
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- Visintainer, R, et al.
(författare)
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Testing and modelling of diverse iron ore slurries for pipeline friction and pump head derate
- 2021
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Ingår i: Iron Ore Conference 2021: Conference Proceedings. - : The Australasian Institute of Mining and Metallurgy. ; , s. 514-530
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A 4-component model for settling slurry pipe flow has been previously described by Wilson et al (2006) and Sellgren et al (2014) to predict pipeline friction loss (hydraulic pressure gradient) over a range of slurry compositions: from fine to coarse particle size, narrow to broad particle size distribution, and low to high solids concentration. The method applies a weighted average of established pipeline models for various settling slurry flow regimes, according to the volume fraction of solids falling within the applicable size range for each model. Further development of the model was undertaken by Visintainer et al (2017a, 2017b), based on a comprehensive set of laboratory tests in 203 mm (8 inch) and 103 mm (4 inch) pipelines, and it was also adapted to the modelling of slurry pump performance derates. However, this work was all performed with solids having a specific gravity near 2.65, as is typical for many mineral processing and dredging applications.The goal of the present work is to test the applicability of these models for settling slurries having a higher solids specific gravity, as may often be seen in the mineral processing of iron ore deposits. To that end, a test program was carried out in a 103 mm (4 inch) pipe loop using various compositions of an iron ore product having a solids specific gravity of 4.75 and containing both coarse and fine solids. By screening and flushing operations, a range of particle size distributions were created having different proportions of the coarse and fine elements. In all, 19 tests were performed with d50 particle sizes ranging from 50 μm to 3.2 mm and delivered solids concentrations from 10 per cent to 43 per cent by volume. Particle size distributions varied from very narrow to very broad, with d85/d50 ratios ranging from 1.75 to 26. Pipeline pressure gradient and pump performance data were collected and used to test the applicability of the previously developed 4- component models and to propose improvements to the models for the handling of high-density solids.
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