The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
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Page 5
... usually passed through a pair of fine rolls which reduce it to about 10 mesh size ( or smaller in the case of very rich ores ) , and is then again quartered or split - shovelled down to about 10 or 20 lbs . , which is taken to the ...
... usually passed through a pair of fine rolls which reduce it to about 10 mesh size ( or smaller in the case of very rich ores ) , and is then again quartered or split - shovelled down to about 10 or 20 lbs . , which is taken to the ...
Page 6
... usually 400 grains or 30 grammes ( at Tarnowitz 50 grammes ) , and the flux employed is , according to Percy , a mixture of * The student may consult Phillips ' Elements of Metallurgy , 1891 , pp . 626 , et seq .; Percy , Metallurgy of ...
... usually 400 grains or 30 grammes ( at Tarnowitz 50 grammes ) , and the flux employed is , according to Percy , a mixture of * The student may consult Phillips ' Elements of Metallurgy , 1891 , pp . 626 , et seq .; Percy , Metallurgy of ...
Page 12
... usually 19 inches by 12 inches wide , and they are gener- ally heated with bituminous coal ( Swansea fashion ) instead of with coke . The scorifier commonly used in Colorado is the 21 - inch size , the charge for which is assay ton ( or ...
... usually 19 inches by 12 inches wide , and they are gener- ally heated with bituminous coal ( Swansea fashion ) instead of with coke . The scorifier commonly used in Colorado is the 21 - inch size , the charge for which is assay ton ( or ...
Page 14
... usually done in ordinary commercial work ) , a closer ap- proximation to the truth is obtained by making no deduction for the silver contained in the granulated lead . Crucible Assays . - The special applicability of this method to ...
... usually done in ordinary commercial work ) , a closer ap- proximation to the truth is obtained by making no deduction for the silver contained in the granulated lead . Crucible Assays . - The special applicability of this method to ...
Page 15
... usually the case ) the author prefers to place the weighed sample in a large roasting dish just inside the muffle door and to roast out the sulphur and arsenic , melting the residue with a mixture intermediate between 4 and 8 ...
... usually the case ) the author prefers to place the weighed sample in a large roasting dish just inside the muffle door and to roast out the sulphur and arsenic , melting the residue with a mixture intermediate between 4 and 8 ...
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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...