32 5slag 98 73 5 9 5 6 51 5 67 5calc head 100 00 21 3 15 4 100 0 100 0______________________________________ magnetics produced by wet high intensity magnetic separation of a south african ore in a pilot plant were processed on a batch basis by spirals and wet high intensity magnetic separator according to the flowsheet shown in fig5 the magnetics product was fed to rougher spiral 48 at a feedrate of 1 2 tons per hour and about 35 solids by weight and the concentrates were fed to the cleaner spiral 49 to produce two products concentrates and tailings the mass and assay balances for the rougher and cleaner spirals are as follows ______________________________________rougher spiral assays recoveries product wt cr sub 2 o sub 3 ptg t pdg t cr sub 2 o sub 3 pt pd______________________________________concentrate 76 4 40 49 0 6 0 3 82 1 43 7 44 7tailings 23 6 28 59 2 5 1 2 17 9 56 3 55 3calculated 100 0 37 68 1 05 0 51 100 0 100 0 100 0headassayed 37 65 1 4 0 5head______________________________________ ______________________________________cleaner spiral assays recoveries product wt cr sub 2 o sub 3 ptg t pdg t cr sub 2 o sub 3 pt pd______________________________________concentrate 89 1 41 97 0 6 0 3 92 0 66 2 69 0tailings.