. Graphite. mm. and should beclosely sized, say through a 20-mesh screen on a 30-mesh, through 30 on 40, 40 on 60,60 on 80, 80 on 120 and 120 on 250. Of course, when there is considerable variance betweenthe mineral and gangue, close sizing is not so important. The speed of the machine variesfrom 350 revolutions per minute in the case of coarse material to 450 for fine. Thisvariation in speed is obtained by means of cone pulleys. The stroke or force of air is variedby the length of eccentric throw by adjusting the eccentric sleeves before described. Thegreater the throw of these eccentrics the
. Graphite. mm. and should beclosely sized, say through a 20-mesh screen on a 30-mesh, through 30 on 40, 40 on 60,60 on 80, 80 on 120 and 120 on 250. Of course, when there is considerable variance betweenthe mineral and gangue, close sizing is not so important. The speed of the machine variesfrom 350 revolutions per minute in the case of coarse material to 450 for fine. Thisvariation in speed is obtained by means of cone pulleys. The stroke or force of air is variedby the length of eccentric throw by adjusting the eccentric sleeves before described. Thegreater the throw of these eccentrics the stronger the air blasts. The heavier the materialtreated the heavier the air blast required. All machines are now supplied with an adjustingdevice by means of which the throw of the eccentrics may be altered at will without stoppingthe machine. The capacity of the machine varies from 9 to 16 tons per day of 24 hours,according to the character of ore treated, and the horse-power required varies from \\to Tailings- \ Middlings* Fig. 13. Sutton, Steele and Steele three-section jig. The Hooper table was used formerly on the graphite ores of theBuckingham district, Quebec, with what results is not known to the writer. 71 Fig. 13 shows the Sutton, Steele and Steele 3-section, dry jig table,which has been used in both Alabama and Canadian mills. This tablehas a smooth deck, free of riffles. It is mounted on a shallow wind chest. Two 30 ton drying fa/ns I Gnzz/y. %• CONCENTRATING DEPARTMENT 7/J Throughs OversI Two whiptap /Rolls/40 * 16 set at %) Throughs 1 Oeduster screws//6 mesh) OyersI Oyers fines /fo//s/40*36) Two Alewaygo screens {30 mesh) Oyers Throughs 3 section dry table , 1 I Concentrates Middlings Tailings 4 I I •— Three cyc/one dust co//ectorsOvers Dust Three screens{/00 mesh)Overs Throughs t—* tzt Overs Ree//40mesh) ThroughsStandard dry ta6/e I T~ 1 Concentrates Middlings Tailings /o/umetric sizer Coarse Medium I 1 c? 3 section dry table 3 section dry table Con
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Keywords: ., bookauthorcanadami, bookcentury1900, bookdecade1920, bookyear1920
