The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
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Page 5
... ordinary shovel by digging into the heap , the operator then Fig . 3. - Quartering Shovel . by a swift backward swing throws out three - fourths of the load over the open back of the shovel into the rejected heap , while the remaining ...
... ordinary shovel by digging into the heap , the operator then Fig . 3. - Quartering Shovel . by a swift backward swing throws out three - fourths of the load over the open back of the shovel into the rejected heap , while the remaining ...
Page 6
... ordinary crucible wind - furnace , and the crucible employed is of wrought iron 4 inches high . The quantity of ore taken is usually 400 grains or 30 grammes ( at Tarnowitz 50 grammes ) , and the flux employed is , according to Percy ...
... ordinary crucible wind - furnace , and the crucible employed is of wrought iron 4 inches high . The quantity of ore taken is usually 400 grains or 30 grammes ( at Tarnowitz 50 grammes ) , and the flux employed is , according to Percy ...
Page 7
... ordinary large scorification muffle , which is 19 inches by 12 inches inside , and the crucibles used are the " Colorado AA and A❞ of the Battersea Crucible Company , the former ( corresponding with the 5 - gramme cup of the Denver ...
... ordinary large scorification muffle , which is 19 inches by 12 inches inside , and the crucibles used are the " Colorado AA and A❞ of the Battersea Crucible Company , the former ( corresponding with the 5 - gramme cup of the Denver ...
Page 14
... ordinary commercial work ) , a closer ap- proximation to the truth is obtained by making no deduction for the silver contained in the granulated lead . Crucible Assays . - The special applicability of this method to certain classes of ...
... ordinary commercial work ) , a closer ap- proximation to the truth is obtained by making no deduction for the silver contained in the granulated lead . Crucible Assays . - The special applicability of this method to certain classes of ...
Page 31
... ordinary lead furnaces . There is no doubt that Hannay's work is interesting , as showing that the volatility of PbS is greater than it is generally supposed to be , and that it is increased in the presence of certain gases ; but his ...
... ordinary lead furnaces . There is no doubt that Hannay's work is interesting , as showing that the volatility of PbS is greater than it is generally supposed to be , and that it is increased in the presence of certain gases ; but his ...
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Common terms and phrases
alloy amount antimony arsenic assay average blast furnace bottom brick Broken Hill bullion carbon cast-iron cent charge CHARLES GRIFFIN coal coke concentrates consumption containing cooling copper cost crucible crust cupellation desilverisation doors dross dust Engineers EXETER STREET feet firebrick Flintshire flue flue-dust flux Freiberg fuel fume fusible fusion galena gases gold grey slag hearth Hofman inches iron jackets labour Lautenthal lead and silver lead sulphide Leadville lime liquation litharge matte melting metal Metallurgy Metallurgy of Lead method mixture molten oxide oxidised Parkes process pipe plates Port Pirie practice produced proportion pyrites quantity rabble reaction reduced residues reverberatory reverberatory furnace roasting sample Schnabel scorifier separate shown in Figs silicates silver contents sintering SiO2 skimmings slag smelting softening furnace speiss sulphate sulphide Table tapped temperature tons Trans treated tuyeres volatilisation volatilisation loss weight work-lead zinc
Popular passages
Page 85 - The arguments for and against " sintering " and " slagging " respectively have been already stated in this chapter, and need not be repeated here. Suffice it to say that the...