Froth Flotation (Sulphide & Oxide)

Froth Flotation (Sulphide & Oxide)

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Oxidized copper flotation with NaHS (1 reply)

M
Maryam
3 years ago
Maryam 3 years ago

Recently we received a bad quality of NaHS (red color), I need please to know the specifictions of the NaHS reagents which impact the sulphidation of oxidized copper.. if there is someone who can help me

J
Jorge
3 years ago
Jorge 3 years ago
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Sodium Hydrosulfide (NaSH) is a light-yellow colored solution with a pH of 11 to 12. The usual strength is around 42% w/w and has a rotten egg smell. It is necessary to prepare a solution (e.g. 20% w/w) to add in the conditioning stage y some flotation cells.  It is important to mention that the addition of air as flotation gas tends to increase the NaHS consumption. Other point to comment is that NaHS is mildly corrosive to carbon steel and cast iron. Stainless steel is a good option. If the reagent is contaminated, its efficiency would be low.

A good preparation system should include a pumping system to transfer the NaHS from the storage tank to the mixing tank. Automatically fresh water is added every time that the transference pump operates. In this way, it is possible to dilute the NaHS to 15 to 20 % w/w.

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