Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

Pyrometallurgy: Roasting, Smelting, Refining & Electrowinning

  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Pyrometallurgy and Electrometallurgy.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

Gold recovery from carbon ash (4 replies and 3 comments)

A
Ahmed Zaky
5 years ago
Ahmed Zaky 5 years 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

J
Jaswant
5 years ago
Jaswant 5 years ago

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

A
Ahmed Zaky
5 years ago

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

C
Colette
5 years ago
Colette 5 years 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.

 

M
inOr
5 years ago
inOr 5 years ago

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

A
Ahmed Zaky
5 years 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?

g
giom
4 years ago

mr ahmed please do you have any idea how to refine microscopic gold .iuse aqua regia on gold ore and i do precipate with smb a orange brown gold powder but no way i can melt it it fuse to black slage all time and in laboratory show no gold do you have any way of prossessing like this type of ore thanks

D
Deano
5 years ago
Deano 5 years 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.

Please join and login to participate and leave a comment.