E/MJ : engineering and mining journal . ool-proof any process may be, variation- are demanded bydifferent ore- and foi different fields of operation. The procedure as first tried aboul ten years ago is shown in How sheet No. 1. This provides for roasting a muffle furnace at a finishing temperature of aboul i that no zinc remains ?\oi,. Hence, b) the aid of a serubbii weak once startin all) all the Si l returned t, - I orbed dail) mi the scrubl Heat required for -from the . Iphite solution (and thet i to be evolved as gas i was obta ined Ivi Inments, by i •? muffle furnace; thai is, both -e- an
E/MJ : engineering and mining journal . ool-proof any process may be, variation- are demanded bydifferent ore- and foi different fields of operation. The procedure as first tried aboul ten years ago is shown in How sheet No. 1. This provides for roasting a muffle furnace at a finishing temperature of aboul i that no zinc remains ?\oi,. Hence, b) the aid of a serubbii weak once startin all) all the Si l returned t, - I orbed dail) mi the scrubl Heat required for -from the . Iphite solution (and thet i to be evolved as gas i was obta ined Ivi Inments, by i •? muffle furnace; thai is, both -e- and the fuel _ The gaseo St l ing on the roasted ore in thei luc of water renders all zinc, which exists as oboluble in the course of two or three mint As a or zinc oxide, s< i i- 30 desirable because it i- pi nc-hi-ulphide solutions containing Complex2mc Sulphide Ore + Dry Crushing PtonT +Muffled Roasting Furnace. T *r- SOWlOn 1 ZincBisulphite Heat(See Ex: Ore gangueLead and Silver FLOW SHEET NO. 1. SHOWING ORIGINAL BISULPHITEPRI ICESS aboul %% zinc, and these solutions on I I • the hoiling [loini under favorable conditions for tl of SO, give off : as insoluble zinc m sulphite abo ts. This insoluble zinc monosulphite is heated incast-in yielding zinc oxide ai S that, like the S()_. from heating the bisulphite solution, is used on a new lot of roasted •free from rod makes first-j spelter. T luble zinc, contains all the lead and silver—ii—and in a • 31 quenl loss to aid the i I or the temperature of the fini 896 ENGINEERING AND MINING JOURNAL Vol. 102, No. 21 roast will cause sintering. Ores with much lime or mag-nesia are not desirable, as these materials consume lime and magnesia will eventually appear with thefinal zinc oxide, as sulphate of lime is very soluble in S02solution. The defects in the procedure outlined in flow sheetNo. 1 were so numerous that the process
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
