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 9
... added . Quartz is often found accompanying galena ; and this mineral , as well as aluminous substances , causes the more loss of metal the finer the ore has to be pulverised for its preparation , and in many cases they cannot be ...
... added . Quartz is often found accompanying galena ; and this mineral , as well as aluminous substances , causes the more loss of metal the finer the ore has to be pulverised for its preparation , and in many cases they cannot be ...
Página 33
... added , and again the temperature is raised . In this way an additional quantity of lead is extracted , and the processes of roasting and reduction are once more repeated . Finally , the ashpit is completely closed , the working door ...
... added , and again the temperature is raised . In this way an additional quantity of lead is extracted , and the processes of roasting and reduction are once more repeated . Finally , the ashpit is completely closed , the working door ...
Página 40
... added , and the doors again opened , so as to allow the contents of the furnace to cool slightly . In about three and a - half hours ' time the third firing commences ; in this the alternate roasting and strong firing is continued as ...
... added , and the doors again opened , so as to allow the contents of the furnace to cool slightly . In about three and a - half hours ' time the third firing commences ; in this the alternate roasting and strong firing is continued as ...
Página 52
... added , and the mass turned over every quarter or half hour . These two - ton charges are then heated in a reverberatory fur- nace for 3 hours till they become nearly liquid , and coal rubbish or saw - dust , and afterwards lime , are ...
... added , and the mass turned over every quarter or half hour . These two - ton charges are then heated in a reverberatory fur- nace for 3 hours till they become nearly liquid , and coal rubbish or saw - dust , and afterwards lime , are ...
Página 57
... fume . The hearth of the reverberatory furnace is removed every 1 years , and added in mixture to the ore smelting in cupola furnaces . The total loss of lead varies according to the weather THE FRENCH REVERBERATORY PROCESS . 57.
... fume . The hearth of the reverberatory furnace is removed every 1 years , and added in mixture to the ore smelting in cupola furnaces . The total loss of lead varies according to the weather THE FRENCH REVERBERATORY PROCESS . 57.
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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