E/MJ : engineering and mining journal . esent invention was designed to over-come this trouble. The apparatus is intended to bringpulped old ores into intimate contact with mercury, soas to extract the gold in the form of amalgam, and topossess great capacity while requiring little attention. The tapered barrel 1. shown in the accompanyingillustration, is inclosed in the outer casing 2, which isprovided with a removable door 3 suitably fastened to barrel rotates on its inlet and outlet tubes, 4 and 5respectively. To inlet tube 4 is attached the rotary scoop6, common in most forms of tub
E/MJ : engineering and mining journal . esent invention was designed to over-come this trouble. The apparatus is intended to bringpulped old ores into intimate contact with mercury, soas to extract the gold in the form of amalgam, and topossess great capacity while requiring little attention. The tapered barrel 1. shown in the accompanyingillustration, is inclosed in the outer casing 2, which isprovided with a removable door 3 suitably fastened to barrel rotates on its inlet and outlet tubes, 4 and 5respectively. To inlet tube 4 is attached the rotary scoop6, common in most forms of tube mills. The outer endof the outlet tube 5 is closed, and the discharge flow isallowed by apertures 7 around the circumference of thetube. These apertures are protected by the guard ring 8,properly spaced from the apertures to allow a free dis-charge, the purpose of this arrangement being to preventtheft of amalgam. The interior of the barrel is divided by a series of parti-tions 9 to form a number of sections or ungula?, these par- 2E. ROBBINS BARREL AMALGAMATOR titions being set alternately at right angles to the barrelaxle and inclined to it as shown. Openings 10 in the par-titions constitute the inlet and outlet of each section in thescries extending the length of the barrel. Referring tothe illustration, it will be noticed that the volume of anygiven section is greater on one side of the barrel axisthan on the other. It is therefore obvious that with agiven volume of mercury in any section the surface ofthe mercury will rise and fall considerably as the barrelrotates. This variation of level results in a more perfect settlingof gold, whereas the alternate expansion and contractionof the width of mercury line in the section exerts a sortof kneading action on the layer of heavy concentratesabove the mercury. Eventually this action brushes theconcentrates through the discharge orifices 10 into thenext chamber of the series as the mercury level of the mercury f
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
