Facts & Figures Book - KPI-JCI

Material HandlingMATERIAL HANDLINGBelt conveyors are designed to carry material via the shortestdistance between the loading and unloading points.When required, belt conveyors can operate continuouslywithout loss of time and are capable of handling tonnages ofbulk materials that would be more costly and often impracticalto transport by other means. This often avoids confusion,delays and safety hazards of rail and motor traffic in plantsand other congested areas.Choosing the right conveyor starts with looking at the fivebasic considerations: Material characteristics, conveyorlength and/or discharge height, TPH feed, conveyor widthand horsepower requirements.1. Material Characteristicsa. Variables include: Particle shape, particle size, moisture,angle of repose, lump size and percentage fines and weight.Characteristics normally used as a rule of thumb include:100 lbs. per cubic foot density, 37 degree angle of reposeand less than 25% of a max. 3” lump.180RECOMMENDED MAXIMUM ALLOWABLE INCLINEFOR BULK MATERIALS° Angle ° AngleMaterial Incline % Grade Material Incline % GradeAlumina 10-12 17.6-21.2 Gypsum, 1/2” Screening 21 38.3Ashes, Coal, Dry, 1/2” Gypsum, 1-1/2” to 3”and Under 20-25 36.4-46.6 Lumps 15 26.8Ashes, Coal, Wet, 1/2” Earth—Loose and Dry 20 36.4and Under 23-27 42.4-50.4 Lime, Ground, 1/8”Ashes, Fly 20-22 36.4-40.4 and Under 23 42.4Bauxite, Ground, Dry 20 36.4 Lime, Pebble 17 30.6Bauxite, Mine Run 17 30.6 Limestone, Crushed 18 32.5Bauxite, Crushed 3” Limestone, Dust 20 36.4and Under 20 36.4 Oil Shale 18 32.5Borax, Fine 20-25 36.4-46.6 Ores—Hard—PrimaryCement, Portland 23 42.4 Crushed 17 30.6Charcoal 20-25 36.4-46.6 Ores—Hard—SmallCinders, Blast Furnace 18-20 32.5-36.4 Crushed Sizes 20 36.4Cinders, Coal 20 36.4 Ores—Soft—NoCoal Crushing Required 20 36.4Bituminous, Run of Mine 18 32.4 Phosphate Triple Super,Bituminous, Fines Only 20 36.4 Ground Fertilizer 30 57.7Bituminous, Lump Only 16 28.6 Phosphate Rock,Anthracite, Run of Mine 16 28.6 Broken, Dry 12-15 21.2-26.8Anthracite, Fines 20 36.4 Phosphate Rock, Pulverized 25 46.6Anthracite, Lump Only 16 28.6 Rock, Primary Crushed 17 30.6Anthracite, Briquettes 12 21.3 Rock, Small Crushed Sizes 20 36.4Coke—Run of Oven 18 32.4 Sand—Damp 20 36.4Coke, Breeze 20 36.4 Sand—Dry 15 26.8Concrete—Normal 15 26.8 Salt 20 36.4Concrete—Wet Soda Ash (Trona) 17 30.6(6” Slump) 12 21.3 Slate, Dust 20 36.4Chips—Wood 27 50.9 Slate, Crushed, 1/2”Cullet 20 36.4 and Under 15 26.8Dolomite, Lumpy 22 40.4 Sulphate, Powder 21 38.3Grains—Whole 15 26.8 Sulphate, Crushed—1/2”Gravel—Washed 15 26.8 and Under 20 36.4Gravel and Sand 20 36.4 Sulphate, 3” and Under 18 32.5Gravel and Sand Taconite—Pellets 13-15 23.1-26.8Saturated 12 21.3 Tar Sands 18 32.5Gypsum, Dust Aerated 23 42.4NOTE: *When mass slips due to water lubrication rib type belts permit three to five degrees increase.