A Practical Treatise on Metallurgy: Adapted from the Last German Edition of Prof. Kerl's Metallurgy, Volúmenes1-2Longmans, Green, and Company, 1868 |
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Página 7
... less extent . The richer the ores are concentrated , the less cost and loss of lead will be occasioned in smelting ; but this preparation can only be effected with a great sacrifice of ore , especially if it contains much silver , and ...
... less extent . The richer the ores are concentrated , the less cost and loss of lead will be occasioned in smelting ; but this preparation can only be effected with a great sacrifice of ore , especially if it contains much silver , and ...
Página 14
... less . increased temperature for a longer or shorter time , and is thereby converted more or less into oxide of lead and sulphate of lead ; part of the galena , however , remains undecom- posed . If the temperature is raised rapidly , less ...
... less . increased temperature for a longer or shorter time , and is thereby converted more or less into oxide of lead and sulphate of lead ; part of the galena , however , remains undecom- posed . If the temperature is raised rapidly , less ...
Página 15
... less loss of lead by volatilisation ( Carinthian process ) than when calcareous galena is employed ( English process ) ; whilst galena containing pyrites must be roasted at a temperature rising gradually but not getting too high ...
... less loss of lead by volatilisation ( Carinthian process ) than when calcareous galena is employed ( English process ) ; whilst galena containing pyrites must be roasted at a temperature rising gradually but not getting too high ...
Página 18
... less fusible , a more frequent repetition of the roasting reduction process is practicable , and , in this way , poorer slags are formed ; but the reactions are mechanically prevented if the quantity present exceeds 10 or 12 per cent ...
... less fusible , a more frequent repetition of the roasting reduction process is practicable , and , in this way , poorer slags are formed ; but the reactions are mechanically prevented if the quantity present exceeds 10 or 12 per cent ...
Página 19
... less liquid slags . The lower the temperature at which the lead is extracted , the purer the metal ; there will also be less loss by volatilisation , and the foreign metals will be sooner oxidised and volatilised . Care must be taken ...
... less liquid slags . The lower the temperature at which the lead is extracted , the purer the metal ; there will also be less loss by volatilisation , and the foreign metals will be sooner oxidised and volatilised . Care must be taken ...
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Términos y frases comunes
24 hours Altenau amalgam amount of silver antimony argentiferous arsenic baryta bismuth black copper blast calcined cent of copper cent of lead cent of silver charcoal charge chiefly clay coal cobalt coke condensation copper matt crucible cubic feet cupelling cupola furnaces cwts decomposed desilverised dross extraction flue fluxes formation formed Freiberg fuel furnace ends fused galena gold hearth heated impure inches iron pyrites Lautenthal lead containing lead matt lime liquation litharge loss of lead loss of metal loss of silver mercury metre mixed mixture muffles nickel oxide oxide of lead oxidised Pattinson's process precipitated production quantity quartz raw lead raw matt reduced refined residues resulting reverberatory furnaces rich lead roasting mass roasting process schlich silica silver per cwt slags smelting process sodium sodium amalgam spar speiss sulphate of lead sulphide sulphuric acid sump temperature treated tuyere u. h. Ztg Upper Hartz volatilisation whilst yield zinc blende