Today I took my Kaolin plug from the funnel after running the water through the plug yesterday, dropped it into a flask, poured in 120-150 ml of HCL, swirled it around a bit and then added Clorox in 3 increments of about 20 ml each. I observed, after the final addition of the Clorox, the kaolin plug is still black with something, a color change of the solution to a yellowish-green color and some fine black particulates floating around. Here shortly I will GENTLY heat to drive off excess chlorine.
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- Thread starter Madraykin
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qst42know
Well-known member
What were you filtering?
qst42know
Well-known member
It could be a small amount of insoluble silver or lead chloride.
What kinds of material were you stripping?
What kinds of material were you stripping?
The material I'm stripping is nickel-plated copper.
I can add now that after the heating yesterday, which began as gentle, but somehow reached boiling (take your eyes off for two seconds...), the solution lost it's green hue and is now primarily yellow. One odd thing to note, I placed a teflon-coated stir bar in the flack with the kaolin plug and HCL-CL solution and set it to spinning. Well, instead of spinning it danced around in the solution. I was going to remove it until I noticed it buffeting the kaolin plug and knocking the black stuff off of it and into the solution. Eventually the kaolin plug lost its cohesiveness and released just about all it was hanging onto.
I can add now that after the heating yesterday, which began as gentle, but somehow reached boiling (take your eyes off for two seconds...), the solution lost it's green hue and is now primarily yellow. One odd thing to note, I placed a teflon-coated stir bar in the flack with the kaolin plug and HCL-CL solution and set it to spinning. Well, instead of spinning it danced around in the solution. I was going to remove it until I noticed it buffeting the kaolin plug and knocking the black stuff off of it and into the solution. Eventually the kaolin plug lost its cohesiveness and released just about all it was hanging onto.
maynman1751
Well-known member
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=49&t=16384
There are good directions here on how to use oxalic acid.
There are good directions here on how to use oxalic acid.
qst42know
Well-known member
maynman1751 said:
Hoke describes the use of oxalic, and I have used it a few times.
It is not a good first refine precipitant.
Thanks for that link qst. I went ahead and ordered some SMB since I saw somewhere in here that it is used for an initial drop. It was cheap. I also ordered a pound of pure tin for making the stannous solution. Then I bit the bullet and bought a vacuum filtration system. Taking along my new BFF Hoke with me to work today and tomorrow.
Thanks again to everyone who has contributed to this thread. Thanks also to all who have taken the time to read here without leaving a comment, because you have posted elsewhere and I have learned from you. This forum is most excellent.
Thanks again to everyone who has contributed to this thread. Thanks also to all who have taken the time to read here without leaving a comment, because you have posted elsewhere and I have learned from you. This forum is most excellent.
