Use of AEROPHINE® 3418A Promoter in the ... - CYTEC Industries

2. Zinc Flotation
Zinc is floated after the lead-copper minerals have been recovered
through selective collectors. If a xanthate is used as the primary
collector instead of AEROPHINE 3418A promoter, the iron not
floated at that stage may cause problems in the subsequent flotation
of zinc. In such cases, it is recommended that a selective flotation be
conducted again.
The zinc minerals should be floated in the traditional manner,
replacing the xanthate with a thionocarbamate (such as the
AERO XD600 or XD601 promoters) or an XD5000 collector.
Dithiophosphates can be used as auxiliary collectors when xanthates,
thionocarbamates, or the XD5000 collectors are used as primary
collectors.
When the xanthate is replaced with a thionocarbamate or an
XD5000 collector, the latter should be dosed at a ratio of one gram
for every three grams of xanthate, while for dithiophosphates the
ratio should be one to one.
Alkalinity
The pH of the circuit will depend on the zinc concentration in the
marmatite ore. Higher concentrations will require higher alkalinity,
ranging from pH 9.5 to 10.5. The pH level should be adjusted
with lime.
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Activation
Activation of the zinc mineral is achieved with copper sulfate at a
dosage of about 50 g/tonne for each one percent of zinc in the heads.
Recommended Collectors for Zinc Flotation
AERO XD601 promoter, AERO XD600 promoter and AERO
XD201 promoter, among others.
2.1 Collector Dosages for Zinc
The XD5000 collectors and the thionocarbamates are fed at a dosage
of 0.5 to 1.0 g/tonne for each 0.1 percent of zinc in heads, with
the pH between 9.0 and 9.5. The dithiophosphates require higher
alkalinity (pH 10.0 to 10.5), with dosages ranging from one to two
g/tonne for each 0.1 percent of zinc in heads.
The zinc associated with sphalerite generally requires lower dosages of
collector and frother, and a lower dosage of lime.
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