The Metallurgy of Lead & Silver: LeadGriffin, 1899 - Lead |
From inside the book
Results 1-5 of 67
Page 14
... sulphur in the ore acts as a reducer , but is counteracted by nitre as well as by oxides of iron and manganese . There are two principal systems of fluxing ; the old system advocated by Mitchell aims at keeping an excess of litharge ...
... sulphur in the ore acts as a reducer , but is counteracted by nitre as well as by oxides of iron and manganese . There are two principal systems of fluxing ; the old system advocated by Mitchell aims at keeping an excess of litharge ...
Page 15
... 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 one - fourth ...
... 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 one - fourth ...
Page 18
... sulphur with a forceps . Burn these in a porcelain crucible , add the residue to the precipitate , which dry and mix in a small glass or porcelain mortar with thrice its own weight of lead flux , adding also the ashes of the filter ...
... sulphur with a forceps . Burn these in a porcelain crucible , add the residue to the precipitate , which dry and mix in a small glass or porcelain mortar with thrice its own weight of lead flux , adding also the ashes of the filter ...
Page 24
... sulphur , arsenic , and even from its alloy with copper . As a rule , commercial lead contains from 1 to 12 dwts . of silver per ton , and rarely as much as 1 oz . The small quantities present appear to protect the lead somewhat from ...
... sulphur , arsenic , and even from its alloy with copper . As a rule , commercial lead contains from 1 to 12 dwts . of silver per ton , and rarely as much as 1 oz . The small quantities present appear to protect the lead somewhat from ...
Page 27
... sulphur in proper proportions , by reducing lead sulphate with any reducing agent , and by pre- cipitating any solution of a lead salt with HS . Lead sulphide , although not so fusible as the metal , readily melts at a bright red heat ...
... sulphur in proper proportions , by reducing lead sulphate with any reducing agent , and by pre- cipitating any solution of a lead salt with HS . Lead sulphide , although not so fusible as the metal , readily melts at a bright red heat ...
Other editions - View all
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...