. Transactions. nditions, the sUme is quickly passed through as thickened A. L. BLOMFIELD AND M. J. TROTT 129 product. This thickenerpractically clears itself ofslime in half an hourafter the feed is shutoff. The pulp thengoes to a mechanicalagitator containing per-forated air pipes, wherethe first change of solu-tion is made. A further change ofsolution and partial de-cantation is made in traythickeners of the opentype. The pulp thenpasses to agitators. 4. To fill sand tanksby methods such as But-ters distributors, thoughmechanically cheaperthan the present method,has the chemical dis-advanta
. Transactions. nditions, the sUme is quickly passed through as thickened A. L. BLOMFIELD AND M. J. TROTT 129 product. This thickenerpractically clears itself ofslime in half an hourafter the feed is shutoff. The pulp thengoes to a mechanicalagitator containing per-forated air pipes, wherethe first change of solu-tion is made. A further change ofsolution and partial de-cantation is made in traythickeners of the opentype. The pulp thenpasses to agitators. 4. To fill sand tanksby methods such as But-ters distributors, thoughmechanically cheaperthan the present method,has the chemical dis-advantage of allowingthe sand to rest too longin a dead solution in theearly stages of treat-ment. It might be pos-sible to overcome this,since the sand has beencleaned, by opening thevalves and draining thesolution off and back tothe crushing plant. Thepossible saving in costof operation over thepresent semi-dry methodof belt conveyor anddistributor is very small,and the method is notas safe from a 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 ton.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
