The flotation process . erably, on a concrete base. The inclined conveyor is first of all built on trestles at the anglerequired. As the size of the dump increases, the conveyor isextended in the form of a cantilever, held by guy-ropes from theupright trestles in the dump. A belt to handle 40 to 50 tons perhour would require to be one of 24 in. six-ply rubber built on 3 to10-in. stringers, placed 3-ft. centres. If driven from the head-end,the driving pulley should be 5 ft. diam. gear-driven, the tail-pulleybeing 2 ft. diameter. The Australian practice is to use separate rollers and troughing-i
The flotation process . erably, on a concrete base. The inclined conveyor is first of all built on trestles at the anglerequired. As the size of the dump increases, the conveyor isextended in the form of a cantilever, held by guy-ropes from theupright trestles in the dump. A belt to handle 40 to 50 tons perhour would require to be one of 24 in. six-ply rubber built on 3 to10-in. stringers, placed 3-ft. centres. If driven from the head-end,the driving pulley should be 5 ft. diam. gear-driven, the tail-pulleybeing 2 ft. diameter. The Australian practice is to use separate rollers and troughing-idlers instead of a combination idler. This practice is simple; theidlers can be more easily lubricated. The best size of roller is 4 in. 256 THE FLOTATION PROCESS diam. It is usually made of steel pipe shrunk onto east-iron endpieces. A favorite practice is to have idlers and dead-eyes on thetop of the same stringers, the loaded and return belt running onrollers supported by the same, and being about three inches The top rollers are usually spaced 4 to 6 ft. centres, the return idlersbeing spaced at twice this distance apart. Wooden rollers for fastbelts of this type are not satisfactory. In calculating the power required for this type of belt it is well DISPOSAL OP^ FLOTATION RESIDUE 257 to remember that the horsepower lost in friction per 100 ft. variesinversely as the length of the belt, averaging from 2 to 6 hp. per100 ft. A tightening arrangement is usually fixed on the tail-pulleyof this type of belt to cause it to run true and take up any unneces-sary slack. When an inclined conveyor has been carried out to aneconomical distance, the tailing at its end is made into a bed fora boom-stacker. This is an iron pole, which is held in position byfour strong guy-ropes. Attached to the pole is an iron lattice-girder,which is supported similar to a cantilever by guy-ropes attachedto the pole itself. This boom-stacker rests on a steel ball in a cup-shaped receiving device,
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