The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
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Page 2
... proportion ( often one half ) of the stream of ore falling from a funnel is continuously diverted to one side , the same process being repeated at a lower level on the remainder of the stream until what is left , say one - eighth or one ...
... proportion ( often one half ) of the stream of ore falling from a funnel is continuously diverted to one side , the same process being repeated at a lower level on the remainder of the stream until what is left , say one - eighth or one ...
Page 5
... proportion , one - fourth to one- half , is thus caught in the troughs , the remainder passing through to form the rejected heap . When nearly full , the troughs are emptied on to a separate heap , which is the reduced sample . The ...
... proportion , one - fourth to one- half , is thus caught in the troughs , the remainder passing through to form the rejected heap . When nearly full , the troughs are emptied on to a separate heap , which is the reduced sample . The ...
Page 8
... proportion of borax , while Iles † uses 30 grammes of a flux made up by the Denver Fireclay Company , in which the proportion of sodium carbonate is somewhat increased . The ore and flux should be very thoroughly mixed in the crucible ...
... proportion of borax , while Iles † uses 30 grammes of a flux made up by the Denver Fireclay Company , in which the proportion of sodium carbonate is somewhat increased . The ore and flux should be very thoroughly mixed in the crucible ...
Page 15
... proportion of sulphur present . b . Without previous roasting . c . After previous roasting . d . The proportion of flour varies according to the nature of the base ; with lime and alumina one - tenth part is sufficient , with all iron ...
... proportion of sulphur present . b . Without previous roasting . c . After previous roasting . d . The proportion of flour varies according to the nature of the base ; with lime and alumina one - tenth part is sufficient , with all iron ...
Page 19
... proportion , owing , no doubt , to errors of manipulation and to the smaller quantity of metal operated upon . Furman Ş found losses in cupelling amounting to from 1 to 7 per cent . of the silver , and 0 to 12 per cent . of the gold ...
... proportion , owing , no doubt , to errors of manipulation and to the smaller quantity of metal operated upon . Furman Ş found losses in cupelling amounting to from 1 to 7 per cent . of the silver , and 0 to 12 per cent . of the gold ...
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Common terms and phrases
20 per cent amount antimony arsenic assay average blast furnace bottom brick Broken Hill bullion carbon cast-iron charcoal charge CHARLES GRIFFIN coal coke concentrates consumption containing cooling copper cost crucible crust cupellation desilverisation dross dust employed Engineers EXETER STREET feet firebrick flue flue-dust Freiberg fuel fume fusible galena gases gold hearth heat Hofman inches Lautenthal lead and silver lime liquation litharge matte melting metallic Metallurgy Metallurgy of Lead method mixture molten ordinary oxide oxidised Parkes process pipe plates Port Pirie practice produced proportion pyrites quantity reaction reduced residue reverberatory reverberatory furnace rich roasting sample Schnabel separate shown in Figs siliceous sintering SiO2 skimmings slag smelting smelting zone softening furnace speiss sulphate sulphide sulphuric acid Table tapped temperature tons Trans treated tuyeres usually volatilisation Water Jacket weight work-lead zinc zinc sulphate
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