. Transactions. r Cent. Cent. On 4 On 8 On 14 On 28 On 48 On 100 On 200 On 300 Through 300 E. W. DAVIS 261 The flow sheet shown in Fig. 2 has been designed to meet theserequirements. Its most conspicuous feature is the large number ofclassifiers; possibly there are too many, but in all tests the limiting factorhas been the capacity of these machines. It is estimated that the capac-ity of this plant will
. Transactions. r Cent. Cent. On 4 On 8 On 14 On 28 On 48 On 100 On 200 On 300 Through 300 E. W. DAVIS 261 The flow sheet shown in Fig. 2 has been designed to meet theserequirements. Its most conspicuous feature is the large number ofclassifiers; possibly there are too many, but in all tests the limiting factorhas been the capacity of these machines. It is estimated that the capac-ity of this plant will be 720 T. per day, receiving a feed and delivering aproduct as shown. The plant will require 344 kw. at the switchboard,which will be per ton of ore crushed, or 14 per ton ofminus 200-mesh material actually produced. This is not an extremelylow figure as better results have been obtained many times in the tests. 6 Ft. Duplex ^\ 6 I 8x2:2) v -, 6 /°\ 1 8x22l v. T Product-200 Mesh Fig. 2.—Flow sheet. The 720 T. per day, or 30 T. per hr., of original feed will divide tothe various units in the following manner: Each first-stage ball-mill willcrush 15 T. per hr. to minus 48 mesh. This 15 T. will pass into theSimplex bowl-type classifier, where 10 T. will overflow as finished product;the 5 T. of sand, with the 5 T. of sand from the second Simplex bowl-typeclassifier, will constitute the feed to the second-stage ball-mill. Thetest data indicate that this can be accomplished with one classifier inclosed circuit with each ball-mill. By adding the second classifier, asshown, it is expected that the tonnage can be increased at least 25 percent. In order to maintain this feed rate, it will be necessary to main-tain carefully the proper ball charge in each mill. A slight increase or 262 FINE CRUSHING IN BALL-MILLS decrease in the average size of the balls making up the charge will causea large loss in efficiency and a corresponding re
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
