Chemical engineering . gaskets. The jars wererotated in the Richards revolving apparatus shown in and 2. This is seen to consist of a horizontal shaft withpulley, having at cither end a cylindrical box holding sevenjars. A bo.\ has a wooden bottom, twelve staves connectedby a stout wire, and sides of lead. A jar is heldloosely in a horizontal position by three sheet-steel .springsscrewed to the wooden bottom. A circular felt pad, l>. tackeddown l>etween three springs protects the bottle against barrel makes revolutions per minute. The results aregiven in
Chemical engineering . gaskets. The jars wererotated in the Richards revolving apparatus shown in and 2. This is seen to consist of a horizontal shaft withpulley, having at cither end a cylindrical box holding sevenjars. A bo.\ has a wooden bottom, twelve staves connectedby a stout wire, and sides of lead. A jar is heldloosely in a horizontal position by three sheet-steel .springsscrewed to the wooden bottom. A circular felt pad, l>. tackeddown l>etween three springs protects the bottle against barrel makes revolutions per minute. The results aregiven in tables and diagrams. One diagram is reproduced inFig. 3, the constant for each curve being the quantity of activereagent in 150 c. c. water; the percentage of extraction is givenas ordinate, and the ratios of gold and silver in tlie alloy as chlorine is a slightly stronger solvent than bromine. For con-centrations below gram chlorine (equivalent to gramof bromine) bromine is a better solvent than chlorine. The. FIGS. I 2.— .xrr.^ FOR CHI,ORIN.\ abscissas. A supersaturated solution of chlorine in water actsmore strongly than one that is merely .saturated: a super-saturated solution can extract a satisfactory percentage of goldfrom a gold-silver alloy containing as much as zo per cent ofsilver, while with the decrease of chlorine flow a certainamount ( g.) and the increase of silver above 10 per cent,the extraction of gold falls off quickly. Bromine is also anefficient solvent for gold, giving extractions of , , and per cent, with solutions of , 5,98, , g. of bromine in 150 c. c. of water; when the brominepresent sinks to g. the yield in gold falls quickly to percent, and then diminishes more gradually. With the concen-trated solutions ( g. of CI equivalent to g. of Br.^ n 1 1 1 ~ CHL ORINATION BROMINATJlON \^ .„ \ ~ V \l <f< \ ?-^ K \ K \ |.. , ..C,.,m. =...,
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
