The Metallurgy of Argentiferous Lead: A Practical Treatise on the Smelting of Silver-lead Ores and the Refining of Lead Bullion Including Reports on Various Smelting Establishments ... in Europe and America

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C. Lockwood and son, 1891 - 396 páginas
 

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Página ii - "From first to last the book is thoroughly sound and reliable." — Colliery Guardian. "For chemists, practical miners, assayers, and investors alike, we do not know of any work on the subject so handy and yet so comprehensive."— Glasgow Herald.
Página 96 - ... sows" occurs also in nearly all cases during the stoppages, when the small doughy masses of reduced metallic iron have an opportunity to stick to the bottom of the crucible, which is no longer protected by a liquid mass. It is well known to every metallurgist that whenever the foundation is laid for a "sow...
Página 99 - The bottom stone, previously put in, is now provided with a thin coating of clay or brasque (a composition of powdered charcoal and clay in varying proportions), which is rammed in with a wooden stamper, after wetting it until it just coheres in lumps. The dam is made in the same manner, but of very good fire-clay, and taking care to make it extremely hard. It has a steep pitch towards the bottom.
Página 141 - ... proper commences. Previous to putting on the blast, however, the front is put in ; that is, the space h under the bridge g is closed up with bricks of stiff clay, rammed in tightly, and reaching a few inches below the damplate. Then the fore-hearth is also covered with clay, pounded down tightly. All the tuyeres, except the four nearest the front, are closed with clay stoppers; their respective wind-bags are tied up with strings, to prevent the escape of wind. The nozzles of the four tuyeres...
Página iii - THE METALLURGY OF ARGENTIFEROUS LEAD. A Practical Treatise on the Smelting of Silver.Lead Ores and the Refining of Lead Bullion. Including Reports on various Smelting Establishments and Descriptions of Modern Smelting Furnaces and Plants in Europe and America. By M. EISSLER, ME, Author of "The Metallurgy of Gold,
Página 99 - ... (a composition of powdered charcoal and clay in varying proportions), which is rammed in with a wooden stamper, after wetting it until it just coheres in lumps. The dam is made in the same manner, but of very good fire-clay, and taking care to make it extremely hard. It has a steep pitch toward the bottom. The tap-hole is made by pounding clay into the space left for that purpose and turning a pointed stick on the outside round a central axis, thus circumscribing a cone. The taphole may be in...
Página 335 - ... stop running. A diminution of the iron-ore and increase of the limestone also worked unfavorably, and the more so the less oxide of iron was in the smelting-mixture. Pure silicates of lime cannot be perfectly liquefied by the temperature prevailing in a leadfurnace. The tapping is done at these works in the old manner, by piercing the tap-hole with a bar as soon as the lead has risen to the slag-spout. The tap-hole is just high enough above the bottom of the hearth to leave a suitable quantity...

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