The apparatus illustrated in the drawings-may be used very effectively in carrying out a method of the invention as follows: Any goldor silverbearing ore or like'material, an alkaline material a such 'as calcium oxide, and a solution of sodium cyanide are introduced moreor less continuously into the ball mill. Antimony Mining Equipment . The ground product 'from'the ball mill passed through conduit 25 into the A perforated cylinder may also be operated any place in the pulp of conduit '25. The finely ground and suspended particles of ore in the cyanide solution overflow through conduit 26 into vessel '3 as the :pulp treated by our invention. The coarser particles which settle to the bottom of the classifier are carried upwardly by the usual rake and are returned through conduit 25' to the ball mill for further grinding. The pulp flows in series from vessel 3, through conduit 21 into vessel A, "from vessel through conduit 28 to vessel 5 and is discharged as tail ings through conduit 29. "In each of these vessels, thepulp is thoroughly-agitated by the paddle wheel W.
The activated carbon must not only be sufficiently coarse/preferably varying from 48 mesh ('Iylervseries) to 1 inch'particles, that it does not pass through the perforations in the cylinders to any appreciable extent but it must be sufficiently hard that it does not pulverize as a result "of attrition in passing through the operation. Antimony Processing Equipment . We appreciate that some carbon will be lost through the perforations due to imperfect screening or breakage but we aim to minimize this condition because the carbon thus lost will result in a loss of metal adsorbed thereon.
Carbon formed of dense woods, nut shells or fruit pits, or coke derived from anthracite coal or petroleum products is suitable foruse in the operation. The fresh carbon is introduced through conduit 30 into the hollow trunnion I I through which it descends to an opening at the bottom. It is there picked up by the worm I1 and conveyed upwardly through the cylinder to an overflow at the top and is discharged into conduit 3|. This fresh carbon has the maximum capacity to adsorb the metals and is brought into contact with a solution having the minimum metal content. The cyanide solution leaving conduit 29 to..be discharged as tailings is practically stripped of its metal content by reason of its contact with the fresh activated carbon in cylinder 8.