File:Lead poisoning in the smelting and refining of lead (1914) (14779127145).jpg

Identifier: leadpoisoningins00hami (find matches)
Title: Lead poisoning in the smelting and refining of lead
Year: 1914 (1910s)
Authors: Hamilton, Alice, 1869-1970 Meeker, Royal, b. 1873
Subjects: Lead Lead industry and trade Hazardous occupations Lead Poisoning
Publisher: Washington, Govt. print. off.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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AND REFINING IN THE UNITED STATES. At the present time a great variety of furnaces exist in the lead industry as practiced in the 20 plants which form the subject of this study. In the preparation of the ores and intermediate products for actual reduction the old hand-rabbled reverberatory is still used to a slight extent, in particular for roasting lead mattes. The Brückner cylinder, which for a very few years flourished as an improvement on reverberatory roasting, has disappeared entirely. The Huntington-Heberlein process of pot roasting, the next roasting innovation after the Brückner, is still largely used side by side with the more recent innovations. The Midvale converters are a mere variation of this process and, hygienically considered, are practically the same thing. A method which is coming into general use now for preparing ore for the blast furnace is down-draft, sinter-roasting by means of the Dwight-Lloyd machines. For pre-roasting the Godfrey or Holthoff Bulletin No. 141—Labor.
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PLATE 2.—ORE HEARTH OR SCOTCH HEARTH. This is protected by a double hood, the flaring outer hood coming over the work plate, but not over the lead well, to the right, nor the car for gray slag, to the left. The photograph was taken purposely during an interval when there was no slag on the work plate, so that fumes would not obscure the view. LEAD POISONING IN SMELTING AND REFINING LEAD. 23 furnaces are commonly used, but Wedge furnaces, patterned on those used in copper smelting, are being introduced. In the actual reduction of the ores to metallic lead the ore hearth, first used in England about the middle of the seventeenth century, is even to-day used on a large scale and with only little change in furnace construction. The reverberatory furnace, whose climax came about a century ago in England, is all but extinct with us now,only a couple of furnaces being in use in just one plant. The blast furnace is our main device for winning metallic lead; it has had a great development and appears

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