Show callows settling and pulp thickening tank ta ilk N j 9 callow of salt lake city who tanks ranks as an eminent authority in matters pertaining to ore dressing and ore treatment by concentrations concentration and who has in vented and patented many valuable devices whose application greatly aid in economical and successful ore treatment has issued a circular descriptive of a recent invention which he calls callows settling and pulp Thicken thickening ilig tanks tank s from which we quote as follows settling tanks are a conspicuous and As a matter of fact to get the greatest griea test settling effect it I 1 is not distance of travel that is wanted but low velocity of flow the missouri river is muddy from its source to its mouth the suspended matter never being able to settle in its comparatively swift moving current and it is not until lit it empties and expands into the gulf of mexico that its waters are eventually clarified the cyanide men have appreciated this idea and in their tanks for settling wet pulps culps they have long used this principle of reff reduced where the classification if any is isso so crude that it might as well not exist so that the Wilf leys are practically fredwith fed with an unclassified ed feed these tanks serve to condense the feed to a certain extent and throw off at least some of the accumulated waters water the overflow water in some cases going to other tanks and thence to banners van ners and in others direct to the creek owing to the height or depth ot of the tanks the orifices which discharge the sands have to be very small to give any condensation at all they then give trouble by choking up when made large enough zo so as not to choke the feed is too dilute to do good work with an on the tables or banners below many attempts have been made to use the aython draw off on these the I 1 se tanks but in every case it V 7 7 ik plan calloe tank 16 3 3 1 10 AW very necessary piece e of apparatus in every concentrating mill As generally designed thoy they are long wooden troughs through which the slimy water flows the settlings being ng drawn off at the inverted apex of the tank from a series of plug holes the preying idea being that length of tank is what at is wanted to get complete settling and allear a clear water overflow the tanks are run tandem or in series the overflow of the first discharging ging into the second and so on the velocity of the last tank being practically the lis as the firt first at most only diminished by the reduced flow of water due to the oe amount drawn off from the spigots of previous tanks velocity by arranging their ta tanks aks for slime settling with a central feed and a peripheral overflow the most direct way of getting a low velocity of flow the callow tank embodies this principle together with other innovations which renders it without exception the best and most efficient device that has yet been put on the market for settling and thickening up the extremely dilute overflows from concentrating cent rating or other mills present methods in many mills water classification below the last jig has been abandoned the overflow from the last jig classifier going direct to tanks which teed feed the Wil Wilf leys has been abandoned sooner or later because it always choked and was to unstop than the old fashioned plugs plugs of all kinds have been designed and tried without improving materially the results if the plug is small enough to do fair work it stops up and if large enough to not stop then the pulp is too thin what the callow tank will do the callow tank will malm make a pulp of any consistency up to 40 per cent of solid matter on any kind of ore feed from 20 to mesh and finer and will not choke but should by accident a gob of waste or other foreign matter stop the discharge pipes they can instantly be cleared by the shutting and closing of two or three small valves it will settle the most dilute slimes and give a clear overflow and a uniform pulp as thick as 40 per cent of solids without the least attention indefinitely what it Is doing the advantage of bf a thickened feed for foi wilfley or banners work is generally lecog S YM R 4 J THE CALLOW TANK nihed but its immense importance in reducing the tailing losses is not sufficiently appreciated precia ted experiments made at the hecla mill couer dalene district idaho show that by increasing the feed to the banners from to grammes per gallon by means of the callow tank the tailings were cut in two and that one 6 foot vanner fed with the thickened pulp made five times more mineral than four other machines working on the old dilute feed at the basin reduction co butte mont overflow waters carrying I 1 per cent of solids were condensed to 10 per cent of solids and several thousand pounds of actual copper per day Is 13 now being saved out of slimy waters that were hitherto considered worthless the tank saves 42 out of the 45 grammes going into it the overflow carrying only 3 grammes of solid matter per gallon it being practically clear enough to wash in or even to drink advantages the main principles of the tank are A central and submerged feed a peripheral per pheral overflow and a dyphon discharge for the settled product its advantages over existing types of settling tanks are I 1 greater settling capacity per square of floor area than any other 2 it never chokes 3 it never leaks 4 it uses up less actual mill height than any other tank 6 it gives a uniform settling of any desired consistency 7 it requires no attention description the callow settling and pulp thickening tank is constructed entirely of steel and cast iron and is in the form of a circular cone A general idea of it can be had from the accompanying half tones an outline drawing of the tank is given on page 14 from which it will be seen that the tank is fed by a lateral from the main supply launder into a receiving box over the center of the tank in which is a feed tube 12 inches in diameter and entering the water to a depth of 12 inches below its surface the overflow ring is a strip of metal 6 inches high and 8 feet in diameter fastened to the sides of the tank with cast iron lugs and forms a gutter into which the clarified water flows from this gutter are two cast iron overflow spouts into the corner formed by the junction of this ring with the sides of the tank is poured thin cement grouting which in pouring makes its own natural slope towards the two overflow spouts surrounding the ring is a 3 inch rubber band held by friction to the ring by tightening clamps similar to the clamps on a band the purpose of this band is to bring the overflow ring to a perfect level by raising or lowering where necessary when the tank is full of water so that the overflow may be exactly the same over all points of the circumference this is a very important adjustment and provides a simple ani and efficient means of maintaining a perfect overflow at all times the water enters the funnel and impinges on the flood float and passes smooth posited the solid matter held in suspension by it becomes clarified at the top and flow ing e over the ring runs down the ce cemented m anted incline gutter and a d out through the th e overflow spouts the solid matter settles to the inverted apex of the tank passes through gli the hollow terminating casting and thence up through the pipe and hose and is delivered through the bent pipe at a point approximately 12 inches below the water level in the tank the consistency of the pulp is regulated by either raising or lowering this discharge or by changing the size of the plug at this point construction the tank is made of no 14 sheet steel riveted together in sections the overflow spouts and lugs for fastening the ring to the tank and the gooseneck goose neck casting at bottom are shipped knocked down all holes are drilled in these and the sheet iron to exact templates the piping hose and nozzles ari ara furnished together with tube and feed funnel and the e necessary rivets and bolts the callow settling tank is manufactured by the utah mining machinery supply company of salt lake city utah ex elusive agents where plans and specifics specific a eions can be obtained together with price and other particulars N V Z K INTERIOR VIEW OF THE CALLOW TANK ly over the edges of this float down through the lower part of the feed tube and into the tank the slimes are thus delivered into the tank below the surface of its contents without agitation and gradually extend outwards to the overflow ring this also has the advantage of submerging those fine particles of mineral that might otherwise have a tendency to float off the water having de d |