The Metallurgy of Lead: Including Desilverization and CupellationJ. Murray, 1870 - 567 頁 |
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Abstrich alloy Alumina antimony argentiferous arsenic assay baryta Berthier blast blast-furnace bottom button of lead calcination carbonic acid cast-iron centners charcoal charge chloride of lead coal coke colour composition condenser cooling copper crucible crystalline crystals ctrs cupellation cwts desilverized dwts experiments Flintshire flue formed Freiberg fuel fume fusible fusion galena grains grammes grey-slag Harz hearth hydrochloric acid latter Lautenthal lead containing lead heated lead-regulus lead-smelting lime liquid litharge loss of lead melted metallic lead mixture molten obtained operation ore-hearth oxide of iron oxide of lead Oxide of zinc oxygen Pattinson Pontgibaud powder proportion protoxide of iron protoxide of lead reduced regulus residue reverberatory furnace roasted Schlieg separated sesquioxide silicate silicate of lead silver skimmed slag slag-hearth smelter smelting soda solution sulphate of baryta sulphide of lead sulphuric acid surface tap-hole temperature tons twyer volatilization weight white-lead zinc
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第 501 頁 - 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.
第 123 頁 - 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...
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