Electrochemical and metallurgical industry . casions much loss of values due to sliming, sincethe recovery of the values from the slimes requires an ex-tensive system of settling tanks beyond the limits of ordinaryplants. In Browns process it is first subjected to the action ofa cyanide solution whereby the finer values are dissolved, andsecond to concentration whereby the coarser values are re-covered. The whole operation may be briefly described asconsisting of the following five steps: (i) pulverization ofthe ore in the presence of cyanide solution; (2) hydraulicclassification by the introd
Electrochemical and metallurgical industry . casions much loss of values due to sliming, sincethe recovery of the values from the slimes requires an ex-tensive system of settling tanks beyond the limits of ordinaryplants. In Browns process it is first subjected to the action ofa cyanide solution whereby the finer values are dissolved, andsecond to concentration whereby the coarser values are re-covered. The whole operation may be briefly described asconsisting of the following five steps: (i) pulverization ofthe ore in the presence of cyanide solution; (2) hydraulicclassification by the introduction of cyanide solution at thebottom of an overflow-tank to produce an ascending current;(3) leaching the ore by the use of cyanide whereby the finervalues of the ore are dissolved; (4) precipitation of the dis-solved metallic values from the solution; (5) treatment ofthe residue of ore by concentration. Barrel-Filter. H. C. Holthoff (782,031, February 7) patents a barrel witha barrel arranged centrally or co-axially, so that the balance. FIG. 2-—FILTER. of the barrel is maintained and less power is required to rotateit. Fig. 3 is a cross-section; a is the barrel, in the center ofwhich is arranged the cylindrical filter frames of lead orporcelain, which is composed of inner or outer =h-;l;s i and having in the outer side of the inner shell and in the innerside of the outer shell, cavities which coincide with each otherand from cells k, the opposite outer and inner walls of whichare perforated with small holes /. The component shells ofthe filter frame are made in segmental sections, bound to-gether and held in place upon the lead-covered rods g bysteel or iron rings encased in lead. The cavities or cells kare filled with coarse sand, crushed silicious stone or othersuitable granular material. On account of limitations of .space, notes on a number ofpatents which were granted during the past month had to bereserved for our next issue. BOOK REVIEWS. Techno-Chemic.\l
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