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 14
... temperature is raised slowly , or continued for a longer time . The most suitable temperature , and the proper time required for the roast- ing , depend on the quality of the ore ; and it is essential * Theorie des Flammöfen processes ...
... temperature is raised slowly , or continued for a longer time . The most suitable temperature , and the proper time required for the roast- ing , depend on the quality of the ore ; and it is essential * Theorie des Flammöfen processes ...
Página 15
... temperature for roasting , and hence there is 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 ...
... temperature for roasting , and hence there is 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 ...
Página 16
... temperature , and the oxide and sulphate of lead formed can be made to react upon the remaining galena , by raising the temperature and stirring the mass till the lead . again ceases to run off . This roasting and reaction is repeated ...
... temperature , and the oxide and sulphate of lead formed can be made to react upon the remaining galena , by raising the temperature and stirring the mass till the lead . again ceases to run off . This roasting and reaction is repeated ...
Página 17
... temperature ; if a higher temperature is employed , oxysulphide will be formed , which does not decompose galena . Towards the end of the second period the temperature must be considerably raised , for the purpose of extracting the lead ...
... temperature ; if a higher temperature is employed , oxysulphide will be formed , which does not decompose galena . Towards the end of the second period the temperature must be considerably raised , for the purpose of extracting the lead ...
Página 19
... temperature , and the silver becomes more concentrated in the former portions of the extracted lead than in the latter . When the lead from the different periods of the reverberatory process is collected together , the average amount of ...
... temperature , and the silver becomes more concentrated in the former portions of the extracted lead than in the latter . When the lead from the different periods of the reverberatory process is collected together , the average amount of ...
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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