Show the story of milling and smelling smelting Sm elting at midvale M I 1 Z f W U 11 1 W VIP n i ka w ta w g 4 va ap S R WR v 4 7 A 6 W v 55 N 01 1 A y faai not unlike huge soup bowls the lead kettles at midvale utah plant represent on one e of the last steps in the production of lead bullion the soup fed into these huge kettles kettle is i molten lead and here impurities puri ties art are removed before the lead is is cast into anodes editors note this is i the fourth of 0 a aries of fi die e articles on the story of milling end and sm smelling smelting elting of 0 lead zinc ore ere at mid midvale v ale I 1 the previous article of this series described briefly notation flotation ot lead zinc sulphide ores at its ha midvale Alid vale plant united states smelting smelling Sm elting refining kenning and mining company colo pany annually treats thousands ot of tons of 0 ead zinc milling ores in its modern ully fully equipped custom flotation mill anil and additional thousands ot of tons ot of siliceous and direct smelting smelling sm elting ores in its large Emel tel A substantial portion of this tonnage comes from numerous nui nerous independent mining companies in utah arizona california colorado laho labo montana oregon and other outside points yes midvale is an important spot on the milling and smelting smelling sm elting map ot of the world the smelter situated adjacent to the flotation mill discussed in previous article treats concentrates from the mill and direct smelting smelling sm elting ores from company and custom mines in utah and out of o state points after weighing and sampling these materials are placed into bins to be withdrawn later tor for roasting or sintering wintering sint ering weighed amounts of 0 certain concentrates ores roaster calcines other materials and fluxes are sintered in order to combine the fine materials into a sinter cake this sinter cake together with oxidized lead ores lime rock scrap iron and furnace coke make up a charge tor for the blast furnace the entire charge Is liqua ted by the intense heat 0 of the furnace the lead trickles through the charge to the bottom of the fur furnace n ace collecting g the gold and silver and some of the other metals the molten lead is drawn ore off into immense kettles where some of the impurities are eliminated before the lead bullion slabs are cast tor for shipment to the lead refinery in the refinery the lead le cl bullion is refined producing ahagh a high grade lead and certain byproducts also gold and silver this electrolytic refining is similar to the well known electroplating pro L THE FIFTH OF THESE ARTICLES WILL APPEAR SOON |