Show the american a new design vacuum filter contributed I 1 in this era of rapid development and Sa option of the flotation system of concen tion any device that simplifies opera ion n or increases economical recovery is of lime I 1 alue importance to mill men in particular sd d to the mining manint industry as a whole one if the most difficult and expensive problems eways ays present is proper f filtration of recovered ed slimes the american continuous vacuum filter manufactured by the united filters corporation on at salt lake city utah is of unique coeur dalene mine owners association is treating retreating re slimes pumped from the river bed and where great difficulty has been experienced perien ced hitherto in providing satisfactory filtration the consolidated mining smelting smelling Sm elting company of canada has just installed a machine of larger capacity in its smelter at trail B C the machine which differs radically from the drum type in construction consists of a series of vertical filter discs on a horizontal shaft thus allowing use of a iw S IA IV T 4 J the american continuous vacuum filter Is of unique design and is said to be a distinct and said to be a distinct improvement over the drum type now commonly in use while its basic principle is practically the athe same the cake is continuously built and f dried by means of a vacuum discharged by a blowback blow back of low pressure air dropping z I 1 the concentrate automatically into a hopper or conveyor below experiments and mill installations have been conducted for over two years but the filter was not put upon the market commercially until some six months ago among the more recent installations is J i a three disc unit just installed at the hayes company slimes plant above pine creek ton the coeur dalene river idaho where the smaller machine in every way more accessible absolutely foolproof and so constructed that changes of filter cloth are easily and quickly made discs are divided into eight pie shaped sections or frames each removable without disturbing any other section the horizontal center shaft consists of eight pipes spaced equidistant around a center shaft by spider spacers and thus held firmly into one main center shaft from each spider radiate eight rods terminating in a rod clamp and nut thus dividing each disc into eight sections between these rods are held the pie shaped frames constructed of double crimped wire bordered by a flatte flattened fied slotted pipe and terminating at the small or denter center shaft end in a nipple saddle flange and gasket the whole is welded into a firm frame over which is drawn a sewed canvas bag the nipple end is wrapped the open end of the bag is closed by lapping the ends over the frame and is held tight with a periphery bag clamp this bag clamp is held in place by the rod clamps and by tightening the rod nuts the bag is sealed and the frame held tightly in place the inside of the bag is connect improvement drum type ed through the saddle flange gasket to one of the eight center shaft pipes hence to the valve when eight of these pie shaped see sections are this thus assembled assemble dp the disc is formed m making aking a rigid yet easily changed filter surface below the ce center anter line of the shaft t the he pulp hopper is placed A half cal tank bogged jogged ged on the discharge side of the filter conforms with the shape of the leaves and thus allows discharge of cake from both surfaces of the discs the filter rotates slowly into the pulp and as soon as a pie shaped frame is submerged the automatic valve turns on the vacuum and sucks water from the pulp build building ing a cake upon the bag As the bag slowly leaves the pulp and passes into the air the vacuum sucks out the remaining water nater and dries the cake just before the bag starts to enter the pulp hopper again the vacuum is shut off and low pressure air automatically inflates the bag bulging it against the scrapers and discharging the cake the scrapers are perpendicular to the center shaft on both surfaces of each disc the jogged bogged pulp hopper forms their support thus allowing the cage to drop straight down to a conveyor or bin below this disc construction filtering on both sides gives a very very much greater capacity for the same space occupied the accessible knockdown knock down discs form an easy means of changing 6 cloths claths only two nuts are loosened to remove any pie shaped bag injured while another can be inserted without stopping the filter due to the direct passage from froin the bag to the valve there is no blowback blow back moisture and there are no wires to impede the canvas it is claimed that for every cubic foot of space occupied the machine produces nine times as much dried concentrate as any other device A fourteen foot drum type s machine of square feet filter a rea has overall over all height of nineteen feet ten inches overall over all width of twenty feet and length of nineteen feet six inches while the american machine of 1100 square feet area occupies floor space of but eight feet by nineteen feet and height of eight feet thus the latter takes up about one sixth of the formers cubic area besides having almost twice the filter area the american machine handles all kinds of concentrates and is especially adapted to very fine colloidal slimes where only a very thin cake can be built the pulp produced by the hayes plant in the coeur calenes dA lenes is more than ordinarily fine and the new machine which has been inspected by many well known operators of the district is said to be doing excellent work |