C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/176
C22B 30/04 (2006.01) C01G 28/00 (2006.01) C22B 1/11 (2006.01) C22B 7/00 (2006.01)
Patent
CA 1154971
A B S T R A C T A method of converting an arsenic-containing waste product to a depositable, substantially arsenic-free form in which the waste product is melted, optionally in the presence of slag former, to form a slag melt and optionally a sulphide melt, in a furnace in which, during turbulence of the melt, there is maintained an atmos- phere having a preselected partial pressure of oxygen and a tem- perature such that arsenic(III)oxide is formed, whereat the arsenic content of the waste product is driven off in the form of gasous arsenic(III)oxide, which is separated by condensation, while the slag melt is removed as a substantially arsenic-free depositable slag. When a sulphide melt is also obtained, this melt is removed sep- arately, subsequent to the smelting and treated so as to recover the metal values thereof.
371628
Eriksson B. Sune
Petersson Stig A.
Boliden Aktiebolag
Gowling Lafleur Henderson Llp
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