The flotation process . o provide good agitation, four vertical baffles are attachedto the wall of the agitation-compartment, against which the pulp isswirled by the two impellers. Lining the walls with expanded metallathing or with a coarse-mesh iron screen adds to the thorough mixingthat the pulp must receive. The two impellers are on a common 282 THE FLOTATION PROCESS shafting, which enters the machine through a stuffing-box in thebottom of tlie machine. The lower impeUer with four vertical vanesis submerged; it agitates and emulsifies the pulp while the upperimpeller, likewise with four ve
The flotation process . o provide good agitation, four vertical baffles are attachedto the wall of the agitation-compartment, against which the pulp isswirled by the two impellers. Lining the walls with expanded metallathing or with a coarse-mesh iron screen adds to the thorough mixingthat the pulp must receive. The two impellers are on a common 282 THE FLOTATION PROCESS shafting, which enters the machine through a stuffing-box in thebottom of tlie machine. The lower impeUer with four vertical vanesis submerged; it agitates and emulsifies the pulp while the upperimpeller, likewise with four vertical vanes, acts as a pump to liftthe pulp and beat air into it. A pulley and belt connects theshafting with a variable-speed motor. A dome-shaped lid is used on the machine. A small hole in thetop of the dome allows the introduction of oil, acid, water, orother materials without the removal of the lid. The lid is soconstructed that it can be turned upside-down with the dome Sfe^m Line Oarcferr Hose. /Wooden Fig. 57. a potter-delprat test. extending down into the froth-box, and in this position it can actas a funnel. The dome rests then on the top of the agitation-compartment and no froth can escape into the froth-box. Thisallows a period of agitation of the pulp before the dome-top isturned right-side up to allow aerated pulp to overflow into the froth-box and down into the spitzkasten, where the froth can be removed. A discharge-plug at the bottom of the machine allows the flushingout of tailing after the test has been completed. So careful hasbeen the design of this test-machine that even this discharge-plugis beveled to fit flush with the bottom of the machine and thus affordno dead space in which the solids might settle. The spitzkasten is long and narrow, in order to permit a deepfroth to be formed and to travel over as long a space as possible,before reaching the discharge. This tends to allow more of the TESTING ORES FOR THE FLOTATION PROCESS 283 entrained
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Keywords: ., bookcentury1900, bookdecade1910, bookidflotationpro, bookyear1916
