kurtak
Well-known member
OK - recently there has been a fair amount of discussion about cyanide leaching & the various methods of recovery of the gold from the leach solutions
What has not really been discussed - at least not discussed in any detail is the destruction of the cyanide for safe disposal
As a result of more recent open discussions of working with cyanide there are now a number of member using &/or at least experimenting with cyanide leaching (including me) so it seems to me the prudent thing to do now is to discuss the destruction/disposal of our cyanide waste - we NEED to make this a priority discussion such that detailed instructions are made known & ALL safety precautions made know
Based on my research - like most of what we do - there is more then one way to skin this cat as well --- so lets get this "important" discussion underway :!: :!: :!:
This discussion needs to be such the it ends up in the forum library for easy reference/search in the future :!:
On the forum 4metals made a good post about CN destruction - but - it was made back in 2010 & needs to be brought back to the forefront for current discussion - here is a link to what 4metals posted back in 2010
:arrow: http://goldrefiningforum.com/phpBB3/viewtopic.php?f=40&t=7627&p=70020&hilit=cyanide+orp#p70020
I will copy that post & re-post it here along with some questions after this post
Also Deano more recently posted info about doing it with the same flow through cell used for winning the gold from solution (which is also the cell Jon is working on & posted about) Deano's post about using it for cyanide destruction can be found here
:arrow: http://goldrefiningforum.com/phpBB3/viewtopic.php?f=37&t=21526&p=223805&hilit=cyanide+destruction#p223805
Back in May 6th, 2014, Lou posted the following comment in reply to a question about CN destruction
[/quote] You are best off to leave it to the professionals and have it disposed of responsibly.
Bleach and peroxide both destroy free CN, but most large facilities use thermal hydrolysis to decompose it. [/quote]
So we see two more methods for dealing with CN waste treatment (H2O2 - or thermal hydrolysis) - BUT - no details on the process &/or safety protocols --- soooo :?: :?: :?:
Also - in my research outside the forum I found this :arrow: http://www.spartanwatertreatment.com/ozone-oxidation-cyanide.html
So ozone is yet another method of dealing with CN waste treatment
Then I also found this where they talk about the two step bleach/acid method - BUT - also another method using SO2 (Sulphur Dioxide)
So as we can see there are a lot of options here for dealing with our CN waste & we need to discuss all of them (in detail) so that members can choose the method that beast suits them - AND - then do it "safely"
I will next copy the old post by 4metals along with some questions about it - & then I have a question about the Eco-Goldex waste in particular due to the fact that ammonia is added to it in order to recover the gold by cementing with zinc or aluminum - I will post that question following re-post of 4metals old post
As a Note; - I posted this here rather then in chemical process because not all the methods are chemical
Kurt
What has not really been discussed - at least not discussed in any detail is the destruction of the cyanide for safe disposal
As a result of more recent open discussions of working with cyanide there are now a number of member using &/or at least experimenting with cyanide leaching (including me) so it seems to me the prudent thing to do now is to discuss the destruction/disposal of our cyanide waste - we NEED to make this a priority discussion such that detailed instructions are made known & ALL safety precautions made know
Based on my research - like most of what we do - there is more then one way to skin this cat as well --- so lets get this "important" discussion underway :!: :!: :!:
This discussion needs to be such the it ends up in the forum library for easy reference/search in the future :!:
On the forum 4metals made a good post about CN destruction - but - it was made back in 2010 & needs to be brought back to the forefront for current discussion - here is a link to what 4metals posted back in 2010
:arrow: http://goldrefiningforum.com/phpBB3/viewtopic.php?f=40&t=7627&p=70020&hilit=cyanide+orp#p70020
I will copy that post & re-post it here along with some questions after this post
Also Deano more recently posted info about doing it with the same flow through cell used for winning the gold from solution (which is also the cell Jon is working on & posted about) Deano's post about using it for cyanide destruction can be found here
:arrow: http://goldrefiningforum.com/phpBB3/viewtopic.php?f=37&t=21526&p=223805&hilit=cyanide+destruction#p223805
Back in May 6th, 2014, Lou posted the following comment in reply to a question about CN destruction
[/quote] You are best off to leave it to the professionals and have it disposed of responsibly.
Bleach and peroxide both destroy free CN, but most large facilities use thermal hydrolysis to decompose it. [/quote]
So we see two more methods for dealing with CN waste treatment (H2O2 - or thermal hydrolysis) - BUT - no details on the process &/or safety protocols --- soooo :?: :?: :?:
Also - in my research outside the forum I found this :arrow: http://www.spartanwatertreatment.com/ozone-oxidation-cyanide.html
So ozone is yet another method of dealing with CN waste treatment
Then I also found this where they talk about the two step bleach/acid method - BUT - also another method using SO2 (Sulphur Dioxide)
So as we can see there are a lot of options here for dealing with our CN waste & we need to discuss all of them (in detail) so that members can choose the method that beast suits them - AND - then do it "safely"
I will next copy the old post by 4metals along with some questions about it - & then I have a question about the Eco-Goldex waste in particular due to the fact that ammonia is added to it in order to recover the gold by cementing with zinc or aluminum - I will post that question following re-post of 4metals old post
As a Note; - I posted this here rather then in chemical process because not all the methods are chemical
Kurt