3. A gold ore concentrate consists mostly of silica, along with some arsenopyrite (FeAsS), and pyrite (FeS2), and a very small amount of gold. It analyzes 2% arsenic and 4% sulphur, which when roasted with air will form As2O3 and SO2 vapour and hematite in the solid residue. If stoichiometric dry air is used, how many kilo-mole of oxygen will have to be blown into the roaster per hundred tonnes of concentrate?

Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter5: Gases
Section: Chapter Questions
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3. A gold ore concentrate consists mostly of silica, along with some arsenopyrite
(FeAsS), and pyrite (FeS2), and a very small amount of gold. It analyzes 2% arsenic and
4% sulphur, which when roasted with air will form As2O3 and SO2 vapour and hematite
in the solid residue. If stoichiometric dry air is used, how many kilo-mole of oxygen
will have to be blown into the roaster per hundred tonnes of concentrate?
Transcribed Image Text:3. A gold ore concentrate consists mostly of silica, along with some arsenopyrite (FeAsS), and pyrite (FeS2), and a very small amount of gold. It analyzes 2% arsenic and 4% sulphur, which when roasted with air will form As2O3 and SO2 vapour and hematite in the solid residue. If stoichiometric dry air is used, how many kilo-mole of oxygen will have to be blown into the roaster per hundred tonnes of concentrate?
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