The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
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Page 4
... become unevenly distributed through the coarse , which would lead to error . Split - Shovel Method . The tool known as the split - shovel consists of a narrow deep trough or series of troughs the same length as a square - ended shovel ...
... become unevenly distributed through the coarse , which would lead to error . Split - Shovel Method . The tool known as the split - shovel consists of a narrow deep trough or series of troughs the same length as a square - ended shovel ...
Page 16
... become bright . The temperature is then regulated so that the fumes rise largely to the muffle arch , a glowing piece of charcoal being sometimes placed in the mouth of the muffle should it appear to be too cool in front . If the ...
... become bright . The temperature is then regulated so that the fumes rise largely to the muffle arch , a glowing piece of charcoal being sometimes placed in the mouth of the muffle should it appear to be too cool in front . If the ...
Page 22
... becomes converted into carbonate . Melted at a low temperature in contact with air , iridescent pellicles of suboxide form on the surface , which at a dull red heat are converted into PbO ; and this PbO , when removed from the lead by ...
... becomes converted into carbonate . Melted at a low temperature in contact with air , iridescent pellicles of suboxide form on the surface , which at a dull red heat are converted into PbO ; and this PbO , when removed from the lead by ...
Page 27
... become wholly or partially oxidised , and their oxides either volatilise or dissolve in the excess of litharge , a ... becoming reconverted into PbO . Lead peroxide , PbO , may be prepared by digesting minium with dilute nitric acid ...
... become wholly or partially oxidised , and their oxides either volatilise or dissolve in the excess of litharge , a ... becoming reconverted into PbO . Lead peroxide , PbO , may be prepared by digesting minium with dilute nitric acid ...
Page 29
... becoming basic sulphate . Although undecomposed by simple heating , it is readily decomposed by silica according to the equation- 2PbSO4 + SiO2 = 2PbO . SiO2 + 2SO2 + O2 . Upon this reaction is based the process of " slag roasting ...
... becoming basic sulphate . Although undecomposed by simple heating , it is readily decomposed by silica according to the equation- 2PbSO4 + SiO2 = 2PbO . SiO2 + 2SO2 + O2 . Upon this reaction is based the process of " slag roasting ...
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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...