Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning 2017-03-23T09:55:18+00:00
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Gold recovery from carbon ash (4 replies and 2 comments)

Ahmed Zaky
2 months ago
Ahmed Zaky 2 months ago

Hello  i want to ask  about the efficiency of gold recovery from ash of activated carbon by aqua regia

(active carbon loaded with gold from cyanide leaching )  where this ash contains average gold 15 gram per kilo ash

 

thank you

Jaswant
2 months ago
Jaswant 2 months ago

It's very carbon will burn at 700-900 °c temperature in muffle furnace

Ahmed Zaky
2 months ago

i already burn it i know have gold in the ash and want to try aqua regia to recover gold from ash

Colette
2 months ago
Colette 2 months ago
1 like by David

Hi Ahmed

Leaching gold from ash is probably going to be tricky, with preg robbing being a real possibility. In practice I have only ever seen ash treated by direct smelting - if you have the ability to go this route I would recommend it over leaching.

 

inOr
2 months ago
inOr 2 months ago

If the gold is present in metallic form, you might try grinding and separating by gravity, under water.  

Ahmed Zaky
2 months ago

how can i know if all gold is metallic or not and if it is metallic what is the tool by which i can separate gold by gravity?

Deano
3 days ago
Deano 3 days ago
1 like by David

The gold in the ash will all be metallic but it will be so finely divided that gravity separation will not work.

The gold can be dissolved in aqua regia or in cyanide solution.

Usually with either of these leaches you carry out filtration after the dissolution and any un-ashed carbon on the filter is sent for re-ashing.

It is possible to ash carbon completely if the carbon layers in the furnace are kept shallow, around 10mm deep for CIP type carbon, 20mm deep for carbons which have only contacted solutions.

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