The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
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Page xii
... Weight of Charge , 188 Method of Feeding , 188 Pressure of Blast , 190 Calculation of Charge , Analyses of Ores and Slags ,. 1. Dark Tuyeres with Long Noses , 2. " Hot Top , " 3. Uneven Descent of Charges , 4. Obstruction of the Syphon ...
... Weight of Charge , 188 Method of Feeding , 188 Pressure of Blast , 190 Calculation of Charge , Analyses of Ores and Slags ,. 1. Dark Tuyeres with Long Noses , 2. " Hot Top , " 3. Uneven Descent of Charges , 4. Obstruction of the Syphon ...
Page 4
... weight made of heavy boiler plates , with planed edges closely butted , and fastened by means of countersunk screws . Two main methods are employed for " cutting down " a sample —viz . , “ quartering " and " split - shovelling . " of ...
... weight made of heavy boiler plates , with planed edges closely butted , and fastened by means of countersunk screws . Two main methods are employed for " cutting down " a sample —viz . , “ quartering " and " split - shovelling . " of ...
Page 6
... weight of sample passing the sieve being also determined . The correct assay value of the ore is then the amount shown by assay of the fine powder plus the assay of the " metallics " calculated back on the weight of sample which passed ...
... weight of sample passing the sieve being also determined . The correct assay value of the ore is then the amount shown by assay of the fine powder plus the assay of the " metallics " calculated back on the weight of sample which passed ...
Page 7
... weight of ore taken . When , however , the gangue consists mainly of silica the results on poor ores ( 8 to 25 per cent . ) are from 3 to 34 per cent . lower than the truth , this error in the case of an 8 per cent . ore amounting to no ...
... weight of ore taken . When , however , the gangue consists mainly of silica the results on poor ores ( 8 to 25 per cent . ) are from 3 to 34 per cent . lower than the truth , this error in the case of an 8 per cent . ore amounting to no ...
Page 9
... weight ( gold and silver 0.42 per cent . , Sb , Cu , Fe , & c . , 3.33 per cent . ) ; so that the net amount by which the dry assay is too low , is in this case 3.45 per cent . of the weight of lead present . He suggests the employment ...
... weight ( gold and silver 0.42 per cent . , Sb , Cu , Fe , & c . , 3.33 per cent . ) ; so that the net amount by which the dry assay is too low , is in this case 3.45 per cent . of the weight of lead present . He suggests the employment ...
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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...