Chemical engineering . level of the solution. The cyanogen thus being set free, and haxing intense chemical activity, owing to its nascent state. fli—** unites with the gold, with the re-sult that a nuuli larger proportion of the metal is saved, or that with a given ore a \voa;er cyanide so- Imidii may he em-ployed. h has. ? if course, long been known that the presence of air is essential for dis-solving gold in cyanide .\. Duncan (787,878, .April 18) patents a treatment of slimes by fiUerin<;.The essential point is that the slimes are accumulated on tlie < xterior nf a filte
Chemical engineering . level of the solution. The cyanogen thus being set free, and haxing intense chemical activity, owing to its nascent state. fli—** unites with the gold, with the re-sult that a nuuli larger proportion of the metal is saved, or that with a given ore a \voa;er cyanide so- Imidii may he em-ployed. h has. ? if course, long been known that the presence of air is essential for dis-solving gold in cyanide .\. Duncan (787,878, .April 18) patents a treatment of slimes by fiUerin<;.The essential point is that the slimes are accumulated on tlie < xterior nf a filterina cell bv suction from the interior of the cell while thelatter is im-mersed in theslime - bearingliquid. The sup-ply of this li-quid is thencut ofl and ametal - solventliquor is intro-duced, and issuclced through,the slimes, etc.\-, .\. (,Mai-eli 21 ) pat-i-nls the oreaKitator a n <1tiller shown inFig. 3, in which8 is a foramin-ous supplemen-tal same is a per-revolving it a con-. FTG. 3.—.\GIT.\TnR .\Nn which acts as a filtering medium : aboveforated inverted-cone-shaped agitator. Bytinuous .systematic agitation is produced, whereby the filteringmedium, 8, is kept free from clogging. The material in theimier inverted-cone-shaped agitator is continuously carriedupwards, flows over and passes downwards between the outersurface of the agitator and the inner surface of the filteringsurface. Through the perforations in the surface of theagitator it enters again into the latter and so on, imtd theprocess is completed. B. Hunt (786,441, -April 4) patents a gravity filter for ex-tracting liquids from granular or comminuted material. is arranged in pyramidal form, of sufficient height tncause its compression by its own gravity. The inventor pro-vides means for removing from the base of the column, bymechanical appliances, a quantity equal to that svipplied at thetop, so that the head and pressure will remain approximatelyu
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
