The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
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Page 3
... remaining much coarser than is necessary for accurate work in machine sampling . As pointed out by Reed for ores of any given grade , there is a definite maximum ratio between the bulk of the sample which is to be reduced in size at ...
... remaining much coarser than is necessary for accurate work in machine sampling . As pointed out by Reed for ores of any given grade , there is a definite maximum ratio between the bulk of the sample which is to be reduced in size at ...
Page 4
... remaining two quarters a new cone is built up in another spot a few feet away , and the same process is repeated until the sample is small enough for another crushing operation , which is performed by rolls when the sample is already of ...
... remaining two quarters a new cone is built up in another spot a few feet away , and the same process is repeated until the sample is small enough for another crushing operation , which is performed by rolls when the sample is already of ...
Page 5
... remaining one - fourth retained in the deep central trough forms the sample . Finishing Sample . - When a sample has been cut down by either of the above methods to about 100 lbs . it is usually passed through a pair of fine rolls which ...
... remaining one - fourth retained in the deep central trough forms the sample . Finishing Sample . - When a sample has been cut down by either of the above methods to about 100 lbs . it is usually passed through a pair of fine rolls which ...
Page 29
... remaining unaltered at a bright red heat . At a white heat , however , it softens and loses a part of its SO , becoming basic sulphate . Although undecomposed by simple heating , it is readily decomposed by silica according to the ...
... remaining unaltered at a bright red heat . At a white heat , however , it softens and loses a part of its SO , becoming basic sulphate . Although undecomposed by simple heating , it is readily decomposed by silica according to the ...
Page 36
... remaining localities cited . The Spanish galena deposits in limestone ( Linares , Sierra Almagrera , Almeria , & c . ) , which are also comparatively free from other metallic sulphides , are of an intermediate character , averaging , as ...
... remaining localities cited . The Spanish galena deposits in limestone ( Linares , Sierra Almagrera , Almeria , & c . ) , which are also comparatively free from other metallic sulphides , are of an intermediate character , averaging , as ...
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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...