The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
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Page 7
... added . As soon as the mixture is completely melted ( which should take about five minutes ) , the contents of the crucible are stirred and its sides scraped down with a chisel- ended iron rod . The crucible is returned to the furnace ...
... added . As soon as the mixture is completely melted ( which should take about five minutes ) , the contents of the crucible are stirred and its sides scraped down with a chisel- ended iron rod . The crucible is returned to the furnace ...
Page 8
... added , points downward , according to Iles , for they are then less likely to retain small globules of lead than if heads downward as recommended by Mitchell and other authorities . No nails are required if the ore be oxidised ; one is ...
... added , points downward , according to Iles , for they are then less likely to retain small globules of lead than if heads downward as recommended by Mitchell and other authorities . No nails are required if the ore be oxidised ; one is ...
Page 10
... adding a drop of the solution to one of the tannin drops on the plate . The standardisation is performed in duplicate , and the value of 1 c.c. calculated . For the assay , take 1 gramme if under 30 per cent . Pb , or gramme if over ...
... adding a drop of the solution to one of the tannin drops on the plate . The standardisation is performed in duplicate , and the value of 1 c.c. calculated . For the assay , take 1 gramme if under 30 per cent . Pb , or gramme if over ...
Page 10
... added of the oe , or in hen the on when eads are Articles of observa- quired for in acid of kes place ; acid of 1.27 ive minutes washed twice ly * each time th water is in- .M.E . , vol . xxiv . , 2 for lead ores , for coppery ores ...
... added of the oe , or in hen the on when eads are Articles of observa- quired for in acid of kes place ; acid of 1.27 ive minutes washed twice ly * each time th water is in- .M.E . , vol . xxiv . , 2 for lead ores , for coppery ores ...
Page 12
... to be scorified with more lead . 35-40 0.0-2.0 Cover of litharge . * Powdered glass helps . Sodium carbonate helps . glass can be added after scorification has commenced , when 12 THE METALLURGY OF LEAD . Scorification Assays,
... to be scorified with more lead . 35-40 0.0-2.0 Cover of litharge . * Powdered glass helps . Sodium carbonate helps . glass can be added after scorification has commenced , when 12 THE METALLURGY OF LEAD . Scorification Assays,
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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...