| Show STRAY ITEMS ITEM FROM AN ENGINEERS NOTE BOOK 6 BY J M CALLOW M E WATER continued each to 1000 pound stamp will require from to 14 gallons per minute each 6 foot flue vanner will require from to gallons per minute for headwater each wilfley table will require from 5 to 10 16 gallons per minute of headwater each compartment of jig treating particles 8 to 12 gals per min min i particles parn cies 6 u to 10 9 y gals guia per min mh tiiu particles 4 to 6 gals per min particles 3 to 4 gals per min particles 2 to 3 gals per min this is fresh water in addition to the amount mount in the pulp which is assumed to contain un not more than one ton water per ton of ore re each revolving screen for spray water ater will require on 1 to i holes 5 to 8 gals per min I 1 to 3 1611 16 holes 10 to 15 gals per min i to 10 M holes 15 to 25 gals brals per min for getting good discharge from elevator buckets running feet per minute every ton an of ore must contain not less than the following weight of water for material crushed through the following sizes of actual opening average dim size opening tons of material to crushed water be crushed through per ton inches inches of ore 03 0 04 4 0 05 5 0 06 08 0 10 inches x 25 millimeters each hydraulic sizer A very veritable quantity richards gives from 10 to 55 tons water per ton of pulp or an average of 20 tons for all the mills visited by him the author has succeeded however with his improved spitz lute in reducing this to from 3 to 31 tons of water per ton of pulp discharged at the when they are properly installed and run each indicated horse power will require with non condensing engines to gals per min condensing engines to gals 9 als per min compound condensing engines to gals per min for stamps and vanner coarse concentrating with jigs and tables and dry crushing cyanide mills I 1 H P per 24 hour ton of crude ore treated is safe figuring for power silver mills dry crushing 11 with stamps to 16 mesh and treating in in 1 pans will take 2 to 25 H P ton per or to 40 M as much as 45 H P per ton combination comb nation mills crushing wet with stamps I 1 concentrating on banners and pan ning the tailings will take H P per ton of ore stamps and banners crushing from 20 to 40 mesh will require from toa to 1 H P per ton coarse concentrating with jigs and tables from 05 to H P per ton dry crushing with rolls to 30 or 40 mesh for cyanide and similar mills 06 to 11 1 1 P per 24 hour ton stamps and vanner nills mills should not require more than I 1 to 5 tons of water per ton of ore coarse concentrating with rolls jigs and tables takes as much as 15 to 20 tons water per ton combination mills 8 tons cyanide mills shoveling tailings tai linas n to tons per ton of ore to sluice tailings from the tanks will take from to gallons per ton of ore or from 13 to 19 tons of water per ton of 30 or 40 mesh tailings A stream of gallons per minute under pounds pressure through a S 1 inch nozzle will sluice 30 mesh tailings from circular tanks at the rate of 60 tons an hour it is to be understood that many of the figures are only approximate and that exact figures cannot be given to cover the many varying conditions which exist in the milling of ores many of the figures are from the authors own experience and others from well known sources and authorities it is hoped that they may be useful to those contemplating mills to estimate offhand the quantities needed to conduct their operation and to enable others having the design of plants to properly proportion their flumes blumes launders and pipe arrangements with more accuracy than they can by the usual method of guessing where water is scarce the net amount required to run the various mills can be reduced to an allnott insignificant figure in comparison with the above div given en ones by the use of settling ponds spitz kasten or settling tanks at the eureka hill mill utah with stamps banners and pans the net consumption for both power heating and concentrating purposes was reduced with settling ponds to as low as 2 tons water per ton of ore treated see engineering and mining journal september 2 1899 at the Matt erhorn stamp mill cal large spitz kasten 6 6 deep preceded by a box ft deep for catching the coarser sands effected a recovery of 80 per cent of the water the spitz kasten being fitted with intermittently moved gates at the apex abek of the box which gave better satisfaction than sophon discharges which were at first tried see engineering and mining journal may 5 1900 in the desert of southern california and arizona both tailings ponds and square settling boxes are used the drained sands in iia the latter case being shoveled into cars for after cyanide treatment the best results with settling ponds ponas was tons of water loss and with settling tanks emptied with shoveling as low as 0 65 tons tolls loss see engineering and mining journ journal al august 24 1900 it would be safe fic figuring 1 to say that with settling ponds 50 to 60 per cent centon of the original quantity is available for use over again and with automatically discharging spitz kasten or square settling boxes from which the sands a ds and slimes are shoveled as much as 75 to 80 80 per cent of the gross quantity used can be recovered for water required for smelling smelting sm elting fur furnaces naces see peters copper smelting smelling Sm elting page to be continued |
