Journal - South African Institute of Mining and Metallurgy . g beencollected in tubs are screened through a series ofinclined sieves placed above one another in aframe to which a side motion is given by meansof a crank driven from the main shaft. The frame moves on wheels, and has a motion eachway of 3 in. Water is sprayed at each screenhead for the purpose of washing the sifted-material down aprons which underlie the screened material talis at the head of thenext screen which slopes in an opposite the lower end of each screen is a gutter inwhich collects each grade se
Journal - South African Institute of Mining and Metallurgy . g beencollected in tubs are screened through a series ofinclined sieves placed above one another in aframe to which a side motion is given by meansof a crank driven from the main shaft. The frame moves on wheels, and has a motion eachway of 3 in. Water is sprayed at each screenhead for the purpose of washing the sifted-material down aprons which underlie the screened material talis at the head of thenext screen which slopes in an opposite the lower end of each screen is a gutter inwhich collects each grade separately. The screensused from top to bottom are :—-]-6 in. mesh, 8mesh, 10 mesh and 12 mesh. The stuff remainingon No. 1 screen is generally sorted by hand on asheet of iron ; that passing through 12 mesh istreated over the Wilfley tables. The four inter-mediate graded products are passed through ahydraulic separator. A. D. Wilsons Hydraulic Separator.—Thisapparatus is based upon the principle of thespitzkasten. It consists (Fig. VI.) of a vessel A of. 2 /?ee?u/cif/ncr l/cr/rs /? CocA FIG. I>. WILSONS SEPARATOR. the shape of two cones joined at their base andfitted at, the top part with a feeding this vessel is fixed a similar one, havinga pipe E at its lower end, and a side discharge Dei LOOT Harry />. Griffiths Notes on Tin Mining in Cape Colony. 177 pipe, and of such dimensions as to allow anannular space of 1 in. between the two. Thevessel A is connected with a receiving vessel Cby means of a 2 in. pipe. The water used forthe separation enters the Bide of the receivingvossel. The upward current units the ore at thebase of pipe B, the lighter particles finding theirway up to the discharge pipe, tin- heavy ore over-coming the current drops into the receiver fromwhere it is drawn oul at will through a tap. Avalve ii inlet water pipe regulates accurately theamount of water required for perfect , of course, has to be varied for each
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