Froth Flotation (Sulphide & Oxide)

Froth Flotation (Sulphide & Oxide)

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Pyrite depression by AMBS (3 replies)

Marshal Meru
8 years ago
Marshal Meru 8 years ago

While I was studying flotation using seawater, I had a problem with understanding the reason why Aeration and Sodium Metabisulfite is used as a Pyrite depressant in Cu-Mo flotation in seawater.

An article said that sufficient Cu-Mo recovery is attained at the expense of allowing large amount of pyrite in flotation froth and AMBS could be a treatment agent because of not requiring lime to depress Pyrite. (Note: Recovery reduction of Molybdenum was suggested to occur in seawater with high PH level.)

However, considering the PH level must be modified before the flotation start, how could the pyrite is cleaned by using AMBS? If the PH is not modified for Chalcopyrite, the dosage of collectors for Cu is dramatically increased, isn't it? Too Complex!

(unknown)
8 years ago
(unknown) 8 years ago
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I'm not 100% what AMBS is but I know SMBS (sodium metabisulphite) is used in this role. AMBS = Air Metabisulfite Treatment http://is.gd/N8zBcW

Have a look and see if you can find any papers on Antofagasta’sCentinela (formerly Esperanza) as I think SMBS may be used in this role.

The other place to look would be in publications from Ian Wark research institute in South Australia. I know as part of the AMIRA P260 project they've done work on the chemistry of sea water flotation systems.

O
Obersturmbann
8 years ago
Obersturmbann 8 years ago
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Na2S, Metabisulfite (Na2S2O5) suppresses all sulfides (exception is molybdenite)

S
Sturmbann
8 years ago
Sturmbann 8 years ago
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I believe he actually meant AMBS = Air + MBS. Air + MBS (normally SMBS) was used at some sites to depress pyrite when sea water is used. I'm not 100% certain on the pyrite depression mechanism either. I'm following discussion in this topic as well.

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