High speed slurry-pot type erosion wear tester


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New high speed slurry-pot wear tester was introduced in 2012 at Nordtrib symbosium (http://www.ntnu.no/nordtrib). The tester provides higher testing speeds and also it enables testing with large particles sizes. Currently sample speed can be up to 20 m/s and partcile size up to 10 mm.
More information about the tester at Tampere Wear Center: http://www.tut.fi/en/about-tut/departments/materials-science/research/research-equipment/wear-research/high-speed-slurry-pot/index.htm

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  • INTRODUCTION Capture audience’s attention (Why is this relevant or important for them? What's in this for them?) Purpose: (What do you hope to accomplish?) Slurry-erosion wear limits machine lifetime and causes breakdowns in heavy industry, like pumping or rock drilling. In these applications the slurry-erosion environment is normally very rough for materials: high velocities and possibly large particle sizes. Still scientific studies have been mostly conducted by test equipment that employs small particle size and/or low velocities.
  • First... Second... And thirdly.. .Reason for pin mill -> heavy-duty
  • Pros and cons of pin mill+durable -> large particles!! =better+many samples-slurry concentration variations
  • Slurry channged after each run!In the tests with fixed sample levels, this (slurry concentration variation) leads to considerable uncertainties and variations in the test results. Therefore, another test method with sample rotation was developed. By rotating the samples evenly through all sample levels, the overall deviations between samples can be minimized. With the sample rotation method, up to eight materials can be tested simultaneously.
  • Slurry channged after each run!
  • Slurry channged after each run!
  • Large particles in contrast to earlier studies (<1 mm)In future work this equipment will be used to test slurry-erosion resistance of different types of materials in variable slurry conditions, including concentration, particle size, and abrasive type. Furthermore the equipment will be used for characterization of different minerals by their erosiveness.
  • High speed slurry-pot type erosion wear tester

    1. 1. New versatile pin mill slurry-pot‘High speed slurry-pot type erosion wear tester’Niko Ojala1*, Veli-Tapani Kuokkala1 and Kati Valtonen1, Päivi Kivikytö-Reponen2 and Petri Vuorinen21Tampere University of Technology, Department of Materials Science,Tampere Wear Center, P.O.Box 589, FI-33101 Tampere, Finland2Metso Minerals Inc., Materials Technology Solutions, Tampere, Finland*email: niko.ojala@tut.fiPresented atNORDTRIB 2012Trondheim, Norway12th – 15th June 2012
    2. 2. MotivationWear of componentsComponent lifetimeService breakdownsMajor failuresSlurry-erosion wearin slurry pumpsHigh velocitiesLarge particle sizes[figure] R.J. Llewellyn, S.K. Yick, K.F. Dolman. Scouring erosion resistance of metallicmaterials used in slurry pump service. Wear 256 (2004) 592–599.
    3. 3. MotivationIn industrial slurry pumping [1]:• The speeds of the particlescan be up to 30 m/s• The size of the particles canvary from micrometers toseveral centimetersIn the previous slurry-pot testers• The speeds are often under10 m/s• The particle size under 1 mmInletOutlet[1] Basics in Minerals Processing, 6th ed., Metso Minerals, 2008[upper figure] http://www.mining-technology.com[lower figure] http://www.metso.com/miningandconstruction
    4. 4. Development of thetesting methodDevelopment of the highspeed slurry-pot testerOverview to topicsThe pin mill configuration
    5. 5. The pin mill configuration• Slurry-pot testers are quite simple machines• There are two distinct types of configurations• Whirling disc/arm - vertical sample positions• Pin mill – horizontal sample positionsWhirling disc slurry-pot [2][2] A.A. Gadhikar, A. Sharma, D.B. Goel, C.P. Sharma, Fabrication and Testing of Slurry Pot Erosion Tester.Pin mill slurry-pot
    6. 6. Structure of pin mill slurry-potWith the new pin millslurry-pot:• Max 2000 rpm(20 m/s sample tipspeed)• Max 8/10 mmabrasives
    7. 7. Characteristic features of high speed pin millconfiguration• Velocity distribution over sample length• Crushability of the abrasives02468101214161820220 1 2 3 4 5 6Peripheralspeed[m/s]Sample length from the sample holder to the sampletip [cm]rpm: 2000 17500204060801000.1 1 10%Fraction [mm]20 min 10 min 5 min2 min 1 min original 8/10 mmVelocity distribution over sample lengthAbrasive crushability: size fractions afterseveral test runs
    8. 8. Development of the high speed slurry-pot tester...
    9. 9. MotorLid withbearingSlurry-potCoolingcoilSieves anddrainagecontainer...and the current equipment
    10. 10. Versatile pin mill equipment...high velocities...slurry-erosion wear...many samples...erosiveness of different abrasivesEnables studies of... Enables use of......behavior of different materials ...large particle sizes...different sample profiles
    11. 11. Development of the testing method• Test materials• AISI 316, round sample profile• Two wear resistant rubbers, square sample profile• Test parameters• 2000 rpm for AISI 316• 1750 rpm for rubbers• Slurry:• 1 kg, 8/10 mm granite gravel• 10 l of water• Concentration 9 wt. %• Change of the slurry withsample weighingFigure. Sample levels (L1...L4).
    12. 12. 0123456780 10 20 30 40 50 60Cumulativemassloss[g]Test time [min](L4) AISI 316-4(L3) AISI 316-3(L2) AISI 316-2(L1) AISI 316-1Longer run timesFixed sample position test with AISI 316 samplesFixed sample position tests have largedeviation of results...The slurry is changedafter eachmeasurement!
    13. 13. time [min] AISI316-8 AISI316-7 AISI316-6 AISI316-50-5 L4 L3 L2 L15-10 L3 L2 L1 L410-15 L2 L1 L4 L315-20 L1 L4 L3 L2Sample levelsSample rotation scheme for AISI samples...improving the testing method: ’Sample rotation’
    14. 14. 01230 5 10 15 20Cumulativemassloss[g]Test time [min]AISI316-8AISI316-7AISI316-6AISI316-5Sample rotation test with AISI 316 samplesStandard deviation with•fixed sample positions up to ±40 %•sample rotation under ±1 %With sample rotation deviation in final resultsshows lot smaller deviationThe slurry is changedafter eachmeasurement!
    15. 15. Sample rotation tests with wear resistant rubbers:Results correlate with the real life applications• Rubber A is ’normal’ wear resistant styrene-butadienerubber with shore A hardness of 60• Rubber B is slurry-erosion resistant natural rubber withshore A hardness of 50• Tested at 1750 rpm for 4x20 minutes with 8/10 mm granite
    16. 16. Conclusions• New high speed slurry-pot tester enables testing• With high speeds, up to 20 m/s• With large particle sizes, up to 10 mm• Of different materials with various sample profiles• Of erosiveness of different abrasives10 mm
    17. 17. Thank you for your attention!Questions?Niko OjalaResearch ScientistTampere University of TechnologyDepartment of Materials Science, Tampere Wear CenterP.O.Box 589, FI-33101 Tampere, Finlandphone: +358 50 317 4516email: niko.ojala@tut.fi