The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
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Page 3
... tons to 10 tons , 10 tons to 1 ton , 1 ton to 200 lbs . , 200 lbs . to 20 lbs . , VALUE IN SILVER - OZ . PER TON . Richest lump , 300 ozs . Average between 20 and 50 ozs . Cocoanut . Orange . Walnut . Richest lump , 3000 ozs . Average ...
... tons to 10 tons , 10 tons to 1 ton , 1 ton to 200 lbs . , 200 lbs . to 20 lbs . , VALUE IN SILVER - OZ . PER TON . Richest lump , 300 ozs . Average between 20 and 50 ozs . Cocoanut . Orange . Walnut . Richest lump , 3000 ozs . Average ...
Page 12
... ton ( or on the 2000 lbs . ton scale , 2.9167 grammes , upon which quantity each mg . of silver obtained represents 1 oz . per ton ) . With ores which are very refractory , or which contain much of volatile constituents , a larger sized ...
... ton ( or on the 2000 lbs . ton scale , 2.9167 grammes , upon which quantity each mg . of silver obtained represents 1 oz . per ton ) . With ores which are very refractory , or which contain much of volatile constituents , a larger sized ...
Page 15
... ton each to be taken , adding the buttons together for weighing , and it is even better to make duplicates of 2 tons each , using slightly larger crucibles . The crucibles should be heated up before use in the SAMPLING AND ASSAYING OF ...
... ton each to be taken , adding the buttons together for weighing , and it is even better to make duplicates of 2 tons each , using slightly larger crucibles . The crucibles should be heated up before use in the SAMPLING AND ASSAYING OF ...
Page 21
... ton with test lead the author has found the uncorrected results to range from 5 to 8 per cent . lower than the assay ... tons to the square inch , while two and a - half times that pressure liquefies the metal . It is , however , low in ...
... ton with test lead the author has found the uncorrected results to range from 5 to 8 per cent . lower than the assay ... tons to the square inch , while two and a - half times that pressure liquefies the metal . It is , however , low in ...
Page 33
... ton of ore ; the richest known is that from Schemnitz ( Hungary ) , a specimen of which , ac- cording to Beudant , gave 7 per cent . of silver , or over 2200 ozs . per ton . † It is a common belief among miners that the grain of galena ...
... ton of ore ; the richest known is that from Schemnitz ( Hungary ) , a specimen of which , ac- cording to Beudant , gave 7 per cent . of silver , or over 2200 ozs . per ton . † It is a common belief among miners that the grain of galena ...
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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...