Ball Mill Failures In November 2011 Collahuasi senior management requested the services of A Boughey Pty Ltd to assist in an investigation of a main pad Ball Mill Shell Crack In April 2012 Collahuasi personnel discovered a crack approximately 2 metres in length on the welded joint between the shell and head on List of Projects INVESTMECH
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Get Detailsball mill shell crack welding A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing processes paints pyrotechnics ceramics and selective laser works on the principle of impact and attrition size reduction is done by impact as the balls drop from near the top of the shell
Get DetailsThe internals of a ball mill can be divided in 4 categories primary role of the mill lining is obviously to protect the mill shell from excessive wear and possible cracks Drying chambers shells are protected by plates with lifters welded on it
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Get DetailsThe ball mill is basically a large cylinder consisting of a shell two slide rings which are supported on sliding bearing one fixed and one mobile and two heads All structural steel members of the cylinder are joined by full penetration welds Fig 1 shows schematically a ball mill and presents photos of its
Get DetailsAccording to this definition given that the energy utilization in a ball mill is between 1×10 −3 and 4×10 −3 m 2 J and that the crack resistance value is between 30 and 60 Jm 2 the theoretical efficiency of the ball mill should be in the range of 15–12
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Get Detailswith increasing mill speed as shell lifters wear is a promising current development in shell liner design and SAG mill operation providing the potential for lower energy consumption increased throughput and startup “ongrind” with new lifters Veloo et al 2006b Highly worn shell
Get DetailsFigure 5 High–low wave ball mill liner Materials The selection of the material of construction is a function of the application abrasivity of ore size of mill corrosion environment size of balls mill speed etc liner design and material of construction are integral and cannot be chosen in isolation
Get Detailseach ball position with a bright finish and sharp demarcation often surrounded by a ring of brown dehrisindicates excessive external vibration A small relative motion between balls and raceway occurs in nonrotating ball bearings that are subject to external vibration When the bearing isnt turning an oil film cannot be formed to prevent
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Get DetailsMar 16 2018 · Taken from the site cement Basic Checklist Shell Liner Thickness Ball Charge Remarks – sizes shape contamination breakages Shell Liner Lifter Thickness Ball Coating Remarks Shell Liner Remarks – crack gaps Ball Classification Remarks Inlet Head Liner Thickness Discharge Grate Slot SizeAverage Inlet Head Liner Remarks Discharge Grate Slot SizeMaximum
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Get DetailsRepair Ball Mill Discharge Trunnion Crack There was a continual increase in ball mill lubrication oil consumption however visual inspections could not confirm the presence of a trunnion oil seal leak by the end of month it was assumed that the only possible place for this leak was at the outboard discharge trunnion seal so that oil was leaking into the slurry discharge pump a maintenance
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Get DetailsCeramic ball mill linings will eventually wear down and need replacement Even old pebble mills with Burrstone linings can be relined with highalumina brick We tear out and dispose of the old brick check the steel shell thickness repair or replace and thin or corroded section and
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Get Detailseach ball position with a bright finish and sharp demarcation often surrounded by a ring of brown dehrisindicates excessive external vibration A small relative motion between balls and raceway occurs in nonrotating ball bearings that are subject to external vibration When the bearing isnt turning an oil film cannot be formed to prevent
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