. Transactions. VOL. LX. 9. 130 ROASTING SULFO-TELLUEIDE GOLD ORES 5. Aeration of slimes immediately after classification is very effective—probably such aeration almost instantly gets rid of the unstable solublesulfides. We attempt to do it fairly fast without additional agitationstorage. Possibly, if room permitted, an aerating agitator between clas-sifiers and first settler would be more effective, 6. It is found that a roast giving the lowest residue also gives a slow-treating slime. Therefore excessive agitation is a good safety insurance,and the additional agitation is obtained in a 37 b
. Transactions. VOL. LX. 9. 130 ROASTING SULFO-TELLUEIDE GOLD ORES 5. Aeration of slimes immediately after classification is very effective—probably such aeration almost instantly gets rid of the unstable solublesulfides. We attempt to do it fairly fast without additional agitationstorage. Possibly, if room permitted, an aerating agitator between clas-sifiers and first settler would be more effective, 6. It is found that a roast giving the lowest residue also gives a slow-treating slime. Therefore excessive agitation is a good safety insurance,and the additional agitation is obtained in a 37 by 23-ft. Dorr agitator, ata cost of 4 mils per Fig. 2.—Dorr duplex classifier with 6-ft. bosvl. 7. The precipitation of solutions from moderately roasted ores, espe-cially of the more basic type, has been distinctly diJB&cult. A markedimprovement in effectiveness and cost has been made by the installationof the Crowe vacuum sjstem of precipitation. Conclusions There is room for argument regarding the relative efficiency of treatingroasted ores in an all-sliming cyanide plant, or in a combination shme andleaching plant. The all-shming plant is probably less costly to install,and it reduces the number of metallurgical problems. This ore, DISCUSSION ]3J however, after roasting, does not require finer grinding than 20 grinding, even in normal times, costs more than the extra recoveryattained. The slimes from a roasted ore have small adhesive quahties and areincapable of sustaining much sand. This limits the type of cyanideapparatus available, unless the all-sliming process is carried far beyondthe economical crushin
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
