Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering 2017-03-23T09:50:31+00:00
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How to neutralize excess m-nitrobenzene sulphonic acid sodium salt used in Gold Stripper (2 replies and 1 comment)

Seeker
7 months ago
Seeker 7 months ago

How to neutralize excess m-nitrobenzene sulfonic acid sodium salt used in gold stripper after the gold has been removed from the substrate?

Please help!

Sorry if it is in the wrong category. I tried to search but could not get this  category.

inOr
6 months ago
inOr 6 months ago

What do you mean by 'neutralize'?  This usually means 'adjust pH to 7, or thereabouts', which usually creates salts of the acid or base you are trying to neutralize.  But you state you are starting with a salt - the sodium of m-nitrobenzene sulfonic acid.  If you are indeed referring to the pH of the gold stripper, then we need to know what it's pH is.  Above, or below 7?  If you are trying to inactivate the mNBS in some sense, then we could use more details before we can answer.  

 

Seeker
6 months ago

Thanks for your reply.
The PH of the solution is 5. M-nitrobenzenze sulfonic acid being a strong oxidizer does not let the gold precipitate out. Even if the gold does precipitate, it causes the gold redissolve into the solution. For this reason I want to make m-NBBS completely ineffective(neutralize) so that it should not interfere with the precipitation of the gold once the gold has been stripped from the substrate. I try to recover the gold with zinc dust. It would be great if you could also suggest some chemicals to recover gold from this gold stripper solution.
Thanks for your help.

Seeker
6 months ago
Seeker 6 months ago

Thanks for your reply.
The PH of the solution is 5. M-nitrobenzenze sulfonic acid being a strong oxidizer does not let the gold precipitate out. Even if the gold does precipitate, it causes the gold redissolve into the solution. For this reason I want to make m-NBBS completely ineffective(neutralize) so that it should not interfere with the precipitation of the gold once the gold has been stripped from the substrate. I try to recover the gold with zinc dust. It would be great if you could also suggest some chemicals to recover gold from this gold stripper solution.
Thanks for your help.

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