Chambers's encyclopaedia; a dictionary of universal knowledge . heinj;used instead of a copper vessel. These pans, whichwere introduced soon after the silver ores ofNevada and adjoininj; states bejran to be worked,are tubs .jorfi feet in diameter, and jjenerally madeentirely of iron. Each has a vertical shaft passingui) throu;,h the centre, upon which is litted a re-volvini; muller with iron shoes, which come almostclose to dies li.\ed to the l)ottoni, and between whichthe pulp passes. This shaft is kept in motion bystrong sjiur gearing, and there is usually a doublebottom to the pan for heati
Chambers's encyclopaedia; a dictionary of universal knowledge . heinj;used instead of a copper vessel. These pans, whichwere introduced soon after the silver ores ofNevada and adjoininj; states bejran to be worked,are tubs .jorfi feet in diameter, and jjenerally madeentirely of iron. Each has a vertical shaft passingui) throu;,h the centre, upon which is litted a re-volvini; muller with iron shoes, which come almostclose to dies li.\ed to the l)ottoni, and between whichthe pulp passes. This shaft is kept in motion bystrong sjiur gearing, and there is usually a doublebottom to the pan for heating Ijy steam. Ditierentpans are in use, but they vary moie in detail thanm principle. Fig. 1. from Eglestons ,shows the Horn pan in section. These vessels arecharged half-full of crushed ore and water, andthey are designed with the intention of unitingas far as possilde a grinding with a stirring sur-face. Common salt, sulphate of copper, and some-times other chemicals are added to the charge. Apul|> is produced just thick enough to allow the. Fig. 1.—Amalgamating Pan :a, muIIer; b, shoes fixed to muller: c, dies fixed to bottom ofpail; rt, scraper; e, driving wheels ; /, wiugs to prevent pulprising too Uigb ; g, steam space. muller to rotate, and the temperature of the chargeis raised by steam to from 160 to 200° F. Thenecessary ijuantity of mercury is added, and thepulp containing the amalgam is ready to be re-moved after the charge has been in the jjan )i\ehours. The amalgam is then cleaneil and straineil,and the mercury separated from the silver bydistillation in a cast-iron retort. Freiherri —The Barrel AmalgamationProcess, formerly practised with much success atFreiberg in Saxony, is lu very recently was in useat some silver-extraction works in America. TheFreil)erg ores are complex. Certain lodes containvarious sulphuretted silver ores in quartz vein-stufi,but other lodes yield along with these argentiferousgalena, zinc-blende, copjier an
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondo, bookyear1901
