The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
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Page xii
... Weight of Charge , 188 5. Wall Accretions or Method of Feeding , 188 " Hangings , " 192 Pressure of Blast , 190 Working Force , 191 6. Hearth Accretions or " Sows , " 193 4. Irregularities in Furnace Work , . 191 7. Cracked Jackets ...
... Weight of Charge , 188 5. Wall Accretions or Method of Feeding , 188 " Hangings , " 192 Pressure of Blast , 190 Working Force , 191 6. Hearth Accretions or " Sows , " 193 4. Irregularities in Furnace Work , . 191 7. Cracked Jackets ...
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 ...
... 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 ...
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
20 per cent amount antimony arsenic assay average blast furnace bottom brick Broken Hill bullion carbon cast-iron charcoal charge CHARLES GRIFFIN coal coke concentrates consumption containing cooling copper cost crucible crust cupellation desilverisation dross dust employed Engineers EXETER STREET feet firebrick flue flue-dust Freiberg fuel fume fusible galena gases gold hearth heat Hofman inches Lautenthal lead and silver lime liquation litharge matte melting metallic Metallurgy Metallurgy of Lead method mixture molten ordinary oxide oxidised Parkes process pipe plates Port Pirie practice produced proportion pyrites quantity reaction reduced residue reverberatory reverberatory furnace rich roasting sample Schnabel separate shown in Figs siliceous sintering SiO2 skimmings slag smelting smelting zone softening furnace speiss sulphate sulphide sulphuric acid Table tapped temperature tons Trans treated tuyeres usually volatilisation Water Jacket weight work-lead zinc zinc sulphate
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