OCR Text |
Show I The Story of Milling and Smelting at Midvale 1 - - I i . - ! V r I. " ' rt ''it t n Not unlike huge soup bowls, the lead kettles at M;dvale, Utah plant represent one of the lart steps in I the production of lead bullion. The "soup" fed into these huge kettles ts molten lead and here impurities im-purities are removed before the lead is cast into anodes. (Tviitr.r's Nto; T;,N i ihr- f-.ur'.h of a ffrics of i- arrirks mi h" -to;-y of mill-inir mill-inir ami sr.-.vl of I-;.il-.ii:c ore nt Mi.iv.ik.. ) The prrviniis article of Mii: Sfrifs described briflly floiiiti-m of lead-zinc lead-zinc supliide oros. At its Midvole P i ; i n t T'niH-rl Strilf'S Pnifdtin Refining and Minim; Min-im; company annualiy treats ijiou tands of tons of lead-zinc milline ores in its n i d d " r n . fully equipped custom flotation mill and additional thousands of tons of siliceous anil direct smrdt in? or(-s in Us lariro emeltf r. A sub? tan! inl port ion of j this tonnaze conies from numerous independent minin z com pan ies in Ctah, Arizona. California. Colorado. I Idaho, Montana. Ore -on and o;h-r ' outside points. Yt'S, Midvale is an ' iniort ant. spot on the milling and snvdtini; map of the world. Thij snHdicr, sitnal'-fl ad.iaeent to the. Hot at ion mill ( d is cussed in previous a n icl ) 1 rca: s connf-n-tratf-s from the mill and direct smeitin? ores from company and custom mines in "L'tah and out-of- statu points. After wejL'hiiiK and sampling tiifse materials are placed into bins i lo lie wifiidrawn later ffir roastin? or sin t i-rinz. Wei.h"d a mount s of : certain c on r-f-n rates, ores, roaster calcines, other materials and fluxes i are sintered in order to coin bine the fi n e materials into a s i n t er , cake. This sint'-r cake, toL'"tber with ox id iz'.'d Jea d ores, lime rock. sera p iron and furnace coke mako up a. charge for the blast, furnace. The entire charge is liquated by the intense lieat of Hip fuiTiace. The lead 1 rick P-s t h roii: h t h cliartre tf) the bottom of the fiirnac coJ!er;ini t)ie gold and silver and some of the olb'r metals. Th molt en lead is dra wn off into j ri-niense ri-niense kt'ttles where Rome of lh impurities are eliminated before tii lead bullion slabs are cast for shipment ship-ment to the b ad refinery. In the refinery the lea 4 bullion is refined eb-d rolyUcally producing a h ii-'h Krade )-ad and certain hy products, also gold and silvpr. Thlt f'Jectrolyt ie refill in? in nm ilar 1 1 the well-known elect ropl.it In g jir o- c FF.. jl (THF, FIFTH OF THF..-F. ARTIfl.FS WII.I, AI'I'KAR SOON.) |