Transactions . -^ t~ ** > mrm. tttif i Screening and Classifying—Cox-Gibbins-Porter o31 recovery in the finer sizes. As the dotted lines show, had not therecovery in the natural feed on the 60 mesh fallen, the curve wouldhave been very similar to the screened feed curve, and even moreregular. From our original feed analyses and assays, table 24,one would expect the recovery to follow the dotted lines and it isquite possible that the result obtained by us was a mere coincidence. mffi^^^^^Htt ^^B -MMMMPU 1 a- * 552 ScHEENixr. and Classifyixg—Cox-Gibbins-Porter The middles recoveries of screen
Transactions . -^ t~ ** > mrm. tttif i Screening and Classifying—Cox-Gibbins-Porter o31 recovery in the finer sizes. As the dotted lines show, had not therecovery in the natural feed on the 60 mesh fallen, the curve wouldhave been very similar to the screened feed curve, and even moreregular. From our original feed analyses and assays, table 24,one would expect the recovery to follow the dotted lines and it isquite possible that the result obtained by us was a mere coincidence. mffi^^^^^Htt ^^B -MMMMPU 1 a- * 552 ScHEENixr. and Classifyixg—Cox-Gibbins-Porter The middles recoveries of screened and natural feeds showthe same general trend, curves somewhat comparable to theletter S. The natural feed, however, is a curve comparable to arectangular hyperbola. The combined recovery curves prove the natural feed to beclearly superior to the others, especially if the curves are roundedout as shown. ?„;.:.,i!;,,i , rrr. N»V! (».. ) f .- -W /• -»! iWXO . ... Screening and Classifying—Cox-Gibbins-Porter 553 The screened feed curve is similar in shape to the naturalfeed curve. The classified feed curve has the appearance of aswitchback, the recover}- rising and falling, though always showinga general decrease. Table 24 gives the results obtained in screening two absolutelyindependent samples of the feed; it is an interesting illustrationof the efficiency of the screening machine. The table also showsthe percentage of copper in the various sizes. Table 25 gives the amounts of copper in the varioiLs sizes ofthe original feed as used for the screening tests and for the classi-fication tests. It will be seen that the primary and secondaryassays check exceedingly well, showing a difTerence of only 0-3lbs. of copper, or less than 0-7%. These tables agree very fairly with Table 19. Thus, fromTable 19 C tests, We find about 3-3 lbs. of copper ore on 20 25 shows 3 14 lbs. In the
Size: 1273px × 1962px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
