E/MJ : engineering and mining journal . well, but it has a tendency to bring upa lot of gangue, unless copper sulphate is added inlarge quantities. The latter chemical seems almostessential to secure good results on these ores. Adilute solution, 1 to 2 lb. to a barrel of water, ispreferable to a saturated solution, as the flow iseasier to regulate. The solution is made up alter-nately in two barrels. In cold weather, steam is used in the mixing is led through a i-2- or %-in. pipe, which passesinside the li,4-in. pipe carrying the oil. This keepsthe oil veiy thin, even in cold weather. T
E/MJ : engineering and mining journal . well, but it has a tendency to bring upa lot of gangue, unless copper sulphate is added inlarge quantities. The latter chemical seems almostessential to secure good results on these ores. Adilute solution, 1 to 2 lb. to a barrel of water, ispreferable to a saturated solution, as the flow iseasier to regulate. The solution is made up alter-nately in two barrels. In cold weather, steam is used in the mixing is led through a i-2- or %-in. pipe, which passesinside the li,4-in. pipe carrying the oil. This keepsthe oil veiy thin, even in cold weather. The outlet ofthe steam pipe is about 3 in. below the pulp level inthe mixing box. The flotation concentrate is carried by a launderto a table, where the zinc and lead sulphides are sep-arated, and any floated gangue is removed. Tablemiddling is taken off over a length of from 2 to 3 ft.,and is run back to the feed elevator leading to thedistributing box. The tailing is returned to the Doit DORR TANK . .Overflow ^ i^ ^ ^ r-. TABLE r^^r^^. flotation mill flow sheet tank, carrying with it most of the oil used in break-ing down the froth, which oil seems to be of distinctbenefit at this point in two ways. The free sulphideparticles suitable for flotation are oiled and sink tothe bottom, where they are later drawn off ready tobe floated. The finest slimes, possibly colloidal,which make trouble in the flotation machine, arefloated off with the assistance of this oil, making theDorr overflow cloudy. A cloudy overflow which getsrid of this troublesome exceedingly fine material isof great advantage, and it pays to circulate aroundthrough the thickener as much as possible the tail-ing from the table on which the froth is tar creosote is about the best oil to use for re-moving this colloidal matter, although I have founda mixture of two parts du Pont wood oil and one partNo. 2 wood creosote to be very good and to producea high-gi-ade concentrate. The pulp should be kept as nea
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
