Show the alsol dry concentrator MINING AND OIL BULLETIN dry concentration is easy theoretically since it is a matter of strati stratification fie at i on of th the e various ore products by gravity and then of removing each stratum in turn practically ti it is not so easy although the proper application of mechanical principles to physical laws should be only a matter of careful design of course the situation is complicated by the various grades and sizes of ore to be handled inasmuch as the larger particles gravitate easily while the very fine material rises in the form of dust this is particularly true where air is the medium by which stratification is facilitated in wet sy systems stenis the fines tend to float the mechanism required for agitation and continuous flow of the material over the concentrating cent rating surface is also a problem requiring careful consideration the fine material any fine material rising from the surface is drawn up through the uptake U and collects and discharges at F the return air circuit A connects with the exhauster blower B which serves the double purpose of furnishing air to the air chamber and collecting the fines fi ne s simultaneously A blast gate not shown in the illustration is inserted in the circuit between the blower and air chamber for regulating the air supply A peculiarly arranged set of eccentrics in the two shafts on which the surface is mounted gives the necessary table movement for rapid progression of the material over the surface all parts are simply arranged reducing the wearing parts to three boxes outside of those of the blower there ZI 17 1 1 i A the alsol dry concentrator A air return 6 exhauster C pneumatic concentrating surface D concentrate discharge E air chamber F fines discharge H feed hopper T tailings discharge U fines uptake description of system the alsol dry concentrating system was invented and perfected to accomplish practically what theory said was possible A specially constructed metal C over which the crushed ore is made to travel forms one of its principal features this surface is perforated with nozzle like perforations through 01 which air is forced from an air chamber E on which the surface is mounted the air shooting through these tiny perforations together with a rapid table movement quickly causes stratification fi of the material A specially formed riffle tapering from a large cross section at the teed feed end H down to a comparatively small cross section at the concentrate discharge to separate the different end D serves contained in the classes classe s of material along the surface ore as it advances is practically nothing to get out of order thus requiring very little attention and making the operation one that may be taken care of by any ordinary mill attendant glean clean concentrates are taken off at D and the tailings flow off at 1 T I power necessary the power required is practically that necessary to drive the blower this runs from less than one horsepower on the small sizes to three horsepower on the largest size some of the ores being successfully handled by this ti is machine are lead zinc gold silver copper and antimony the alsol concentrator is th the e invention of A W tyler of young tyler construction and metallurgical engineers wesley roberts building los angeles t and the th 3 machines are being built in los angeles |