Show the new hydraulic cyanide ank the mining review is in receipt of a circular letter issued by the hydraulic cyanide tank company of denver descriptive of tha th 3 hydraulic cyanide tank recently invented and for which letters patent have been issued from this letter we boute as follows the apparatus the apparatus consists of a solid Puts outside fide shell of boiler steel and an inner shell the bottom and sides of which are perforated metal covered with suitable filters the same as the false bottom of an ordinary cyanide tank in other words the principle of the peri perforated orated false bottom is carried up along the sides also alpo thus increasing the filtering surface enormously the outer shell is so arranged that the openings in it can be made air and water tight when under pressure in the center of the tank is a pressure standpipe which is also perforated and covered on the outside with filtering material to prevent it from being filled with slimes during the filling of the tank this central pressure standpipe stand pipe is connected at the top with the hydraulic pressure pipes supplying either cyanide solution or wash water as required which are forced from the center outwardly through the pulp and filters into the annular space between the perforated and solid walls the piping is also so arranged that the fluid pressure can be cut off and compressed air introduced into the central pressure standpipe stand pipe the supply pipes furnishing the cyanide solution wash water and compressed air are so arranged with proper valves and connections that the supply and pressure of any one of them can be reversed from its flow into the central pressure standpipe and directed into the annual space between the solid outside shell and the perforated walls and bottom forcing the pressure inwardly through the perforations and niters filters into the pulp thus cleaning the filters and counteracting any packing of the pulp against them no great pressure is ever needed for whenever pressure is applied one drain cock must be open ordinarily 15 to 20 pounds is ample and this should be put on gradually by slowly opening the pressure valve percolation a failure the treatment of slimes by percolation has s always been a failure even when aided by a vacuum pump owing to the impossibility of getting the cyanide solution and wash ash water to move fast enough through the fine pulp but in using this new method the enormously increased filtering area of the fhe tank and the hydraulic pressure combined gives the operator absolute control i of the speed and flow of the liquid and h he e n force it through the pulp as rapidly or as slowly as he desires this tank can be used in dry crushing mills where the dust or slimes are collected by sizing screens or bag houses in wet crushing mills where the ore is amalga mated and concentrated and the tailings and slimes treated by cyanide but ut it is especially valuable in cyanide mills which have adopted the practice of wet crushing with stamps using the cyanide solution as battery water and separating the sands from the slimes before treatment construction and operation referring to the cut it is a front view of the tank showing the construction of both the outer and inner shells p parts arts of which are broken away and the perforated central pressure standpipe stand pipe connected with which are the hydraulic pressure pipes for the cyanide solution and the wash water as well as the pipe for compressed air the arrangement of pipes and valves for reversing the flow of solution wash water and compressed air from the central pressure standpipe stand pipe into the annular space the arrangement ran gement of the filters on sides bottom and central pressure standpipe stand pipe the bottom discharge valve etc etc every part being numbered in accordance with the following description of its use in wet crushing cyanide mills where the solution is used as battery water viz the slimes are run into the drainage and leaching tank through the filling pipe no 1 and the liquid contained in them at once begins to drain out through the filtering materials no 3 and no 4 and the perforated inner shell no 5 and is caught and held in the annular space between the inner shell no 5 and the solid outside shell no 6 from whence it runs out through the drainage pipes no 7 and no 8 and is conducted through the precipitation boxes the filters no 3 and no 4 prevent the slimes from running through the solution and they gradually settle on tile the bottom of the tank and accumulate until there is a sufficient amount for treatment the supply is then cut off by closing the valve in the filling pipe no 1 the manhole man hole no 2 is then closed the valve in the solution pipe no 9 is opened and fresh cyanide solution is admitted into the central pressure standpipe stand pipe no 10 which is surrounded by the filtering materials no aa and no aa the hydraulic pressure of the column of cyanide solution forces it continuously through every particle of the pulp and out through the filtering materials no 3 and no 4 and the perforations no 11 of the inner shell no 5 where it drains into the annular space between the outer solid shell no 6 and the perforated inner shell no 5 from whence it Is carried off through the drainage pipes no 7 and no 8 passing through the precipitation boxes into a sump where it is standardized and pumped to the top of the solution column again this operation is continued until the values are all dissolved when the supply of solution is cut off if during the leaching process the pressure radiating OUTWARDLY from the central standpipe stand pipe no 10 should pack paak the pulp on the side niters filters and interfere with the drainage the flow of the solution can be reversed by conducting it through the branch pipe no 12 into the annular space between the two walls thus forcing it INWARDLY through the perforations no 11 and the filters no 3 and no 4 freeing and cleansing them and draining off through the perforated bottom no 13 and the drainage pipe e assure 1 1 r pressure avani e n pipe h water pipe pipe for reversing pipe for reversing flo of cyanide flow of wash solution az water shmas L 14 r pipe 2 aa perforated standpipe stand pipe calva 4 cocoa matti X per shell per r 80 t I 1 solid outer shell 9 CL drain pip 7 aldrain per orr 0 bottom 8 inch discharge valve 11 HYDRAULIC PRESSURE SLIMES TANK webbs no 8 this cleansing may be supplemented by introducing compressed air into the annular space through the air reversing pipe no 15 which will alil thoroughly open the pores of the filters should the filters on the perforated bottom no 13 become clogged the solution can be introduced between the solid and perforated bottoms through the lower portion of the pipe no 12 so that it will rise UPWARDLY through the perforations and filters freeing and cleans cleansing ng them and drain off through the side filters and out through the drainage pipe no 7 and this may also be supplemented by introducing compressed air under the perforated bottom no 13 through the lower portion of the air reversing pipe no 15 when the leaching is completed compressed air is admitted into the pressure standpipe stand pipe no 10 through the air pipe no 14 the effect being to at once compress the pulp and thus force or squeeze out all of the gold solution held therein and this pressure of the compressed air may be alternately reversed through the pipe no IS 16 until the pulp is as dry as is desired when the pressure Is cut off wash water is then admitted into the pressure standpipe stand pipe no 10 by opening the valve in the hydraulic water column no 16 and is forced by its own pressure through the leached beached mass to wash out the remaining values being caught in the annular space and discharged through th the e drainage pipes no 7 and no 8 after being thoroughly washed the leached beached and worthless pulp is quickly discharged from the tank by opening the bottom discharge valve no 17 and turning on the water column no 16 alternating the flow of water through the pressure pressure standpipe no 10 and reversing water pipe no 18 until the tank is empty and filters clean application in amalgamating mills where the ore is crushed in clear battery water fh the fhe e tailings or slimes after passing over the plates and concentrators are run into the hydraulic tank the battery water forced out of them by compressed air the solution admitted through the pressure preisur e standpipe stand pipe and the leaching and washing proceeded with as above described in dry crushing mills the tank is filled with the dry ore or with the dust from the sizing screens or bag houses and the valve in the solution pipe no 9 is opened when the pressure of the cyanide solution at once forces it outwardly through the perforations fo and filters of the pressure e standpipe so that it it radiates eap evenly n ly and quickly t through the ore until every atom is thoroughly saturated saturate with it when the leaching and washing are m accomplished ill as before described bed n W c V with m many i any refractory ores arid afia slimes it may be e found advisable to saturate them t thoroughly with the cyanide soji solution tion and allow them to standard stan dand leach a certain time and gnp in such ch cases the dissolution of the gold will be much more rapid if compressed air is introduced into the solution to replenish the supply of oxygen or fresh cyanide solution may be forced through them intermittently I 1 as pi preferred referred by the operator As with wath all ordinary slimes a very short treatment will extract all odthe values contained in them the tank can be discharged and refilled every few hours summary competent cyanide experts have pronounced this tank to tobe be the most practical and valuable invention in metallurgy since the perfection of the modern concentrating table as it combines in one simple device all of the good features of every known method of cyanide treatment in addition to the absolutely new feature of using hydraulic pressure in forcing the solutions and water water through the pulp the following is a short summary of its good points viz alz 1 it does away with filter presses 2 collects and treats the slimes in the same tank without the expense of 3 surplus solution in slimes is decanted i off automatically while the tank is fillin filling g and thus decreases by 75 per cent the amount of solution to be carried off in stock by wet crushing cyanide mills A 4 hydraulic pressure forces both solution and wash water through the pulp rapidly 5 hydraulic pressure does not pack slimes as one atom of fluid simply displaces another atom 6 pressure can be applied from elevated storage tanks or with small duplex pump 7 no great pressure Is required and there is but little strain on the tank as one drain drain cock must always be open when the pressure is applied 8 clogging of filters is absolutely prevented by reversing the flow of solution wash water or compressed air from the central standpipe stand pipe to the annular space between the flow and perforated walls 9 compressed air is used to drive out solutions and wash water from the pulp to keep the pores of the filters open and to aerate the solution when needed 10 no labor and no power is required the whole treatment treatment consists of turning the column valves and reversing the pressure when needed 11 the tank is quickly emptied of leached beached pulp by opening the bottom discharge valve and reversing the flow of wash water from the central standpipe stand pipe to the annular space caving the pulp to the bottom and cleansing the filters at the same time 12 values in the pulp are rapidly and completely extracted in a few hours instead of days in the settling tanks 13 costs but little more thana than a settling tank andaas and has tenfold ten fold its capacity Is built of boiler steel stee and will last a lifetime there is nothing to get out of repair r 15 will pay for itself in a short time out cf values now lost i 15 will work even better on the lore ore just as it comes from the crushing machinery without any sizing to separate the sands from the slimes and in fact an entire cyanide plant of any given capacity could be equipped with these tanks of larger size for one halt half of the cost of the present tank equipment and do much more rapid raped and satisfactory work |