C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/08 (2006.01) C22B 3/20 (2006.01)
Patent
CA 2104736
14 Abstract of the Disclosure: A process for high extraction of zinc from calcine containing zinc oxide and zinc ferrite, comprises the steps of leaching such calcine with a sulphuric acid bearing solution in a neutral leach stage followed by a low acid leach stage with a first solid-liquid separation stage between the neutral and low acid leach stages to dissolve the zinc oxide while leaving the zinc ferrite substantially undissolved, separating a residue containing the zinc ferrite in a second solid-liquid separation stage following the low acid leach stage, leaching the zinc ferrite with a sulphuric acid bearing solution at an initial acid concentration of 50-60 g/l and a temperature of 90°C up to boiling to simultaneously dissolve the zinc ferrite and precipitate the iron content of the ferrite as a jarosite by the addition of ammonia or other alkali ions to the leaching solution, separating a residue containing jarosite in a third solid-liquid separation stage, neutralizing the overflow of the third solid-liquid separation stage to a pH of about 1.4-1.8 with neutral leach underflow from the first solid-liquid separation stage or calcine at a temperature of at least 75°C to further precipitate iron as jarosite and reduce the soluble iron concentration to less than 4 g/l, and recycling the content of the neutralization/iron precipitation stage to the low acid leach stage.
Berube Michel
Rosato Lucy
Nadeau Francois
Noranda Inc.
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