Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

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Pre-treatment of sulphide bearing gold ores before cyanide leaching. (2 replies and 2 comments)

Mshindo jr
6 years ago
Mshindo jr 6 years ago

I am currently working as a graduate metallurgist at Anglo-gold Ashanti - Geita Gold Mine in Tanzania. Regarding the sulphide nature of the ore we treat at the plant, we normally add Lead Nitrate so as to suppress the Sulphide minerals from been leached by cyanide but rather react with Lead nitrate added to chemically form Lead Sulphide (Galena). The current problem we are facing is; a daily blockage of the piping system that advances Lead Nitrate solution from our Lead Nitrate mixing tank ( i.e.an agitated tank)... Can I get help on what can be the reason(s) behind the blockage despite perfect mixing withing the mixing tank and what can be the proposed solution(s)?

Thanks in Advance.


Richard S
6 years ago
Richard S 6 years ago
1 like by David

I suspect that your lead nitrate reagent is reacting with something in the water you are using to mix the reagent.  Do you have an analysis of the water that you are using?  You might be forming a carbonate or other scale compound.  You might try a practical test by using deionized water for mixing and see if the blocking by scale diminishes or ceases.  Another possibility is that the reagent is close to saturation and is crystallizing out of solution.  Try reducing the strength to see if that helps.

5 years ago

Am interested with topic, am Tanzanian student and I need your support if you don't mind

6 years ago
Pabloski 6 years ago

I would check, precipitation of the mix (temperature and saturation points) and velocity of the pumping.

Are you adding CaO? if yes, if nothing of the previous mentioned points doesn´t gives you an answer, I would go with an anti-incrustant, just a small volume per minute and problem solved.

6 years ago

Hi Richard,
Check system pumps. Which type of pumps do you use? I recommend peristaltic pumps with VSD and cheek diameter of pipes

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