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WATER in the desert - Flocculants


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  1. How do flocculants (clarifying/flocculating agents) affect gold recovery?
  2. Do these agents act detrimentally to the recovery process?
  3. Do they attach themselves to gold particles similar to Sodium Thiosulfate?
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Sounds like you are trying to recover gold chemically.  Those questions are likely beyond what you'll get a reasonable answer to, and probably will need to get a mining degree to get an answer to.

That seems like an "End of the internet question" where good knowledge on that is just not available on a google search.

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Posted (edited)

I work for the Las Vegas Water District, we use Sodium Thio for Floc... have 2 treatment plants each capable of running 600 MGD.  Our drying beds from the leftover particulate, has no Gold :aw-shucks: , thats water from Colorado River/ Lake Mead...

Edited by DolanDave
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Flocculants help to remove suspended particles from wash water. If you are wet processing free milling gold the addition of settling ponds is necessary whether you are processing your material with fresh water or reusing the water.

Flocculants are added to the already used process water so they have no direct contact with free gold unless you are getting losses in your processing system. Flocculants will increase your gold recovery if you are recycling your process water because all things being equal dirty water loses more gold in a gravity separation process than clean water.

Flocculants are necessary, and often required by law, if you are returning process water to a surface body of water. Basic mining - if you take clean water out you must return clean water to the system. Flocculants are a big part of that.

If you don't like the idea of using minerals (Flocculants) to clear your process water you can do what the big miners do and use a centrifuge, a lamella clarifier or an ips.

If you are wet processing placer material in the desert you can expect to lose anywhere from 40 - 80% of your process water for each wet process cycle. Most will be trapped in the fine silty material that is a constant companion of desert placers. The more clay in the material the lower your gold and water recovery rates will be. Recovering what water you can will help your operation keep costs down but you will need to constantly import fresh water to your site to continue processing.

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20 hours ago, DolanDave said:

I work for the Las Vegas Water District, we use Sodium Thio for Floc... have 2 treatment plants each capable of running 600 MGD.  Our drying beds from the leftover particulate, has no Gold :aw-shucks: , thats water from Colorado River/ Lake Mead...

This is interesting ...

What tests are being ran on your dry bed particulate?

As I have read and tried to understand it, Sodium Thiosulfate binds to AU, then processing further via electrowinning gold is extracted.

 

21 hours ago, Stillweaver hillbelli said:

Doesn't quite answer the questions posed, but... 

https://www.911metallurgist.com/blog/flash-flotation-cell

This is neat. We used something similar when I worked in the plating industry, the flotation cells were used to keep metals suspended in our processes.

22 hours ago, chrisski said:

Sounds like you are trying to recover gold chemically.  Those questions are likely beyond what you'll get a reasonable answer to, and probably will need to get a mining degree to get an answer to.

That seems like an "End of the internet question" where good knowledge on that is just not available on a google search.

https://www.google.com/search?q=sodium+thiosulfate+gold+extraction

 

 

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wrong rabbit hole

The most common, cheap and effective mine water flocs are Aluminum sulfate (alum), ferric chloride and ferric sulfate. Which is best to use depends on your waste pH and associated minerals.

Flocs are used to process wastewater. There is no reason but incompetent processing that would lead to free gold being exposed to a Floc.

Keep It Simple

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22 hours ago, clay said:

 

Flocs are used to process wastewater. There is no reason but incompetent processing that would lead to free gold being exposed to a Floc.

 

My initial post-

WATER in the DESERT - Flocculants

  1. How do flocculants (clarifying/flocculating agents) affect gold recovery?
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