45 PROBLEMS 1. A short-head cone crusher is available for crushing 2 tons of pyrites per hour. On similar materials, the

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45 Problems 1 A Short Head Cone Crusher Is Available For Crushing 2 Tons Of Pyrites Per Hour On Similar Materials The 1 (98.71 KiB) Viewed 25 times

45 PROBLEMS 1. A short-head cone crusher is available for crushing 2 tons of pyrites per hour. On similar materials, the overall energy efficiency has been found to be 3.15 per cent. The raw feed is to be crushed by a jaw crusher, whose product constitutes the feed to the cone crusher. The cone crusher operates in closed circuit with a 14-mesh screen. The cone crusher product and recycle stream analyses are given below. On the basis of calculations and of any assumptions which you may find necessary, select a Dodge-type crusher that will do the job. The surface ratio (n) may be considered to be 6.5 above 3 mesh. The full-load energy requirement for the short-head cone crusher is 5 hp. The recycle ratio (recycle stream/prod- uct stream) is 1. - - Product Mesh Mass % -14 + 20 29.8 --20 + 28 30.2 -28 + 35 25.0 -- 35 + 48 9.6 -48 + 65 3.8 -65 +100 1.6 Recycle Stream Mesh Mass % - 3+ 4 + 3.8 - 4 + 6 + 6 10.0 - 6 + 8 8 19.6 8 +10 26.0 -10 +14 36.6 -14 +20 4.6 - - - - 100.0 100.0