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The Metallurgy of Lead: Including Desilverisartion and Cupellation
No hay vista previa disponible - 2018
The Metallurgy of Lead: Including Desilverization and Cupellation (Classic ...
No hay vista previa disponible - 2017
Abstrich alloy antimony argentiferous arsenic assay baryta blast blast-furnace bottom calcination carbonate carbonic acid cast-iron centners charcoal charge chloride of lead coal colour composition condenser cooling copper crucible crystals ctrs cupellation cwts Derbyshire desilverized dross dwts enriched lead experiments Fcap fire-bridge Flintshire Flintshire furnace flue formed fuel fume fusible fusion galena grains grey-slag hard lead hearth heated impure lead containing lead-smelting lime liquated liquid litharge matter melted metallic lead mixture molten obtained operation ore-hearth oxide of lead oxygen Pattinson Pontgibaud poor lead portion Post 8vo powder proportion protoxide of lead quantity of lead red-lead reduced regulus residue reverberatory furnace rich roasting separated sesquioxide side silicate silver skimmed slag slag-lead smelter smelting softening sulphide of lead sulphuric acid surface tap-hole tapped Tarnowitz temperature thick tion tons treatment twyer volatilization Vols weight white-lead woodcuts yield zinc
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Página 501 - The operation is conducted by two men. One is seated on the floor, with a large flat stone before him, and with a moveable flat stone-stand at his side. His fellow-workman stands beside him with a crucible filled with melted lead, and having poured a certain quantity upon the stone, the other lifts the moveable stone, and dashing it on the fluid lead, presses it out into a flat and thin plate, which he instantly removes from the stone.
Página 123 - After observing this phenomenon once or twice, he began to conceive that possibly some difference might be found in the proportions of silver held by the part that crystallized, and the part that remained liquid. Accordingly, he divided a small quantity of lead into two portions, by melting it in a crucible, and allowing it to cool very slowly with constant stirring until a considerable quantity crystallized, as already mentioned ; from which the remainder, while still fluid, was poured...