C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 1/02 (2006.01) C22B 1/10 (2006.01) C22B 11/02 (2006.01)
Patent
CA 2065837
Roasting of ores with metal values such as precious metal ores for recovery of metal values with conversion of arsenic to an insoluble form in-situ in presence of an additive such as iron and in presence of oxygen injected initially or supplementally in a roaster such as in a circulating fluid bed roaster; volatilized arsenic in roasting of ores may also be converted to am insoluble form in gas phase in a two stage roaster process after removal of solids from a gas phase and contact with an additive at high oxygen concentration in a second stage roaster.
Bandel Gebhard
Fernandez Rene R.
Fitting Arno
Hannaford Anthony L.
Kofalck Hans
Metallgesellschaft Aktiengesellschaft
Outokumpu Oyj
Robic
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