Can anyone help me to recover silver from Silver Potassium Cyanide which used in plating industries.
Thanks
Hrushikesh
Thanks
Hrushikesh
Juan Manuel Arcos Frank said:Basically you have to use a pH of 12,lower pH yields to hydrogen Cynide,a very toxic gas wich smells like almonds,then add zinc dust,the silver goes down BUT the best and safe way to do this will be provided by GSP or Harold_V,both have experience with cyanide solutions better than mine.
hrushi said:Thanks
but how to destruct cyanide
Hrushi
hi, by adding dilute HCL to eliminate free zinc, this process can precipitate silver?Actually, pretty good advice. The pH is somewhat more forgiving than you implied, but it's better to be safe than sorry. PH can slip as low as 9½ and still be safe.
The solution should contain a little free cyanide----and best results are achieved using zinc flour (fine dust). You can expect an ounce of silver for every ounce of zinc used, to the point of total extraction.
I suggest a large vessel, stirred well, with the zinc sprinkled in while the solution is in motion. Stir again, using an aluminum rod if available. Allow to settle well, then decant. A second precipitation with a small amount of zinc will insure that all of the values have been recovered. Rinse the solids well with water, then process with cold dilute HCl to eliminate free zinc. If the solution contained traces of gold, the wash could be with dilute nitric, separating silver from the gold.
Harold
Welcome to us.Hi i need help. How can I recover Ag silver from cyanide solution
Here are some Links to study:Hi i need help. How can I recover Ag silver from cyanide solution
To elaborate, yes Zinc can recover Silver and/or Gold from a Cyanide solution.Hi i need help. How can I recover Ag silver from cyanide solution
hi thanks for the reply. i understood acid mixed with cyanide release HCN which is very toxic. Is there other method to recover the silver.Welcome to us.
Harold has not been here in years.
And you DO NOT add acids to Cyanide.
thank you..Here are some Links to study:
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From my understanding adding HCL can precipitate silver as silver chloride?To elaborate, yes Zinc can recover Silver and/or Gold from a Cyanide solution.
But as you read from Harold's description, it need a small excess of Cyanide and when finished it needs to be very well washed free of Cyanide.
After it is established that it is Cyanide free, you can dissolve the excess Zinc by HCl.
You use Zinc as described in the post from Harold.hi thanks for the reply. i understood acid mixed with cyanide release HCN which is very toxic. Is there other method to recover the silver.
Thank you
What kind of safety measures do you have at your facility??From my understanding adding HCL can precipitate silver as silver chloride?
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