Sign in to follow this  
Followers 0
K Rose

Using Leach On Ore For Gold Recovery

19 posts in this topic

Anybody out there versed in using iodide as leach? I need a little more info on using an acid buffer during oxidation and preciipitation to prevent base metal biuldup in leach.

Share this post


Link to post
Share on other sites

What kind of material are you leaching? How much of it do you have? What do the assays indicate is the nature of the ore (ie., what other metals are present, etc.

 

Chris

Share this post


Link to post
Share on other sites

5 dump truck loads of granite assyed @ 20 ounces per ton.Plus I would like to correct a mistake. The acid buffer is suposed to alieveate buildup of salts by supplying extra oxygen and hydrogen atoms.I thinkIgot that right. Anyway,I am open to any better sugestions from more knowledgeable people than me.

Share this post


Link to post
Share on other sites

Thanks for the  info.I am glad to see that icmj is linked to that site. It's what got me started expeirimenting  with the iodide leach.I went from there to doing web searches on leaching gold with iodine and the other halides. I found "free"info on expired patents that listed several options for oxidizers and precipitators.It also listed several options for the acid buffer.The info calls for adding the oxidizer and precipitator in the presence of a buffer but does'nt specify if it is added to the leach or to the oxidizer before being added to the leach. In my small scale expierimentation of repeated leaching in the closed loop cycle without the buffer has caused the leach after precipitation to become an odd blue color instead of being clear.I can only assume with my limited knowledge that it is from a buildup of salts or maybe a buildup of base metals.Hence my desire to seek the knowledge of experts.

Share this post


Link to post
Share on other sites

The presence of significant amounts of Sulfides can greatly complicate things. You didn't mention what, if any sulfides you have. Granite can contain sulfides, especially when its mineralized.

 

Other metals can complicate things - though you have not told us much of any info to go on, Blue colors in solution can possibly indicate copper.

Have you had the ore tested for base metals? It does make a difference.

 

You mentioned 20 ounces per ton, I assume that's gold, though it could be silver. Have you crushed and panned any samples? Often it is necessary to process free gold separately from gold locked up in other minerals.

 

You mentioned that your ore was granite. Mineralized granite does exist, but 20 ounces of gold seems awful high for mineralized granite. Who tested your ore and have you had other assayers test it? If you have not had it tested by a second assayer (and maybe even a third), I would do that before I invested any further money in treatment.

Share this post


Link to post
Share on other sites

Can anybody out there address the original question of how to introduce the acid buffer to the leach ?We have gotten way off track to the original question.Yes I am new to this.No I am not that knowledgeable.Right now it is my toy to play with.At the present time I plan to keep it small scale.I do plan on checking to see if it free milling when my rock crusher arrives this week.I apologize for not stating it was gold,or for not being able to offer more info for you to go on.Maybe I will be wiser next tlme I throw myself to the lion's den.But for future reference for whatever I have my hands on to leach, I would like to simply know how to apply the buffer.Once again I show my ignorance but are there really that many variables concerning the buffer?And as for the refiner,I enjoy doing that myself.A simple man like me can go a long way on a little at a time on something like this.I really did not realize what I thought to be one simple question would mushroom into such a complicated matter.Oh well,thank you for your time and knowledge guys.

Share this post


Link to post
Share on other sites

Thank you for the info.I just put it in my favorites so I can access it as soon I log off here .As for as the assay numbers I can only quote what I was given.But as far as divulging any more info that doesn't pertain to the original question I will decline to do so.One thing for certain time will tell if  the assay is correct or not.The only reason that info was given was because it was asked of me by someone that I hoped was going to cough up the answer to my question.But I realize that answering one question with ten more questions is the art of journalism and is what makes the guy good at his job.

Share this post


Link to post
Share on other sites

K Rose,

 

You asked one question with no relevant information. You presented ten irrelevant facts and won't provide answers to relevant or irrelevant questions.

 

Thanks! - Geowizard

I feel for K Rose on this one. He asked a specific question. "Anybody out there versed in using iodide as leach? I need a little more info on using an acid buffer during oxidation and precipitation."

After reading this thread I also would be feeling like I was getting grilled if I was in his shoes.

IdahoJim and Ronald C like this

Share this post


Link to post
Share on other sites

Steve - to me Its like someone calls up AMDS and wants a part for his dredge but doesn't know what that part is, and is offended when you start to ask questions to try to help figure out what the needed part actually is.

 

Leaching with iodine / iodide solution is a difficult and messy process, and the summary by Dr. Williams on the ICMJ website is correct, but far from complete, and in fact leaves out a lot of very critical information. Dr. Williams said it well: I really hate to see folks trying to follow a cookbook recipe to the point that when something goes a little wrong it wrecks everything. There really is no one size fits all answer on what chemicals to use or how much to add or how those chemicals will react - so simple cookbook directions are often totally unreliable. Some ores can be processed no problem with halides like iodine, but some are darn near impossible to process with halides, some could react to produce toxic by products, etc.

 

Acid buffers control the acid Ph levels. They do not directly control oxidation levels or base metal concentrations.  Depending on what other chemicals are in solution, acid levels can affect some types of base metals, and can affect oxidation levels under certain conditions. Without knowing what other chemicals are present, the nature of the ore, etc. - its like trying to guess a dredge part having no idea of the dredge maker, size of the dredge, what the part does, etc.

 

I have participated in the Gold Refiners forum and though a lot of guys there have experience in processing electronic scrap, few know much about ores, and the two are quite different. I found when I was there that some guys just wanted to tinker and mess around. That's all fine, and if K Rose wants to tinker - no problem. On the other hand if someone wants people to help figure out if the ore is amenable to that type of leach, and what is the best way to handle the ore, you cant ask those who are willing to help to do so in the dark and without any information. 

John Oates likes this

Share this post


Link to post
Share on other sites

Now that is a great answer Chris!

I am just giving voice to a perception on my part, without meaning anyone in particular, and I may of course be off base. Just the net effect of the thread.

Share this post


Link to post
Share on other sites

I agree wholeheartedly with you Steve,that is a great answer.Now that I have gotten a handle on the theoretics of how to apply the buffer,I am ready(hopefully)to move on to the percieved situations that you have enlightened me with.While I do not have the answers you need at this time to properly advise me;I do desire to aquire that info and get back to you.But I will give you what I have so far.Other commodities from the district this came from are ;Cu,Lb,V,Ag,F and possible U and Th .The description is;Veins filling fissures in the Pennsylvanian bar,B formation and Cambrien Bliss formation.As for the concentrations of the other commodities,I haven't got that info yet.Also don't know about sulfides at this time.On another note,I read the article under the resource tab about the Blm and assays,found it to be quite an eye opener.I feel that a red flag may have gone up over the possible uranium and thorium.Don,t  know till you tell me and you probably need more to go on than what I've been able to supply at this time.But I am tickled to see this thread got updated to hot;always good for the ratings you know.

Ronald C likes this

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0