kadriver
Well-known member
Here is the second half, part 2, of the platinum refining video:
https://youtu.be/HbDwaccp50c
kadriver
https://youtu.be/HbDwaccp50c
kadriver
gcdrummer02 said:is there any reason you chose the calcination route over the formic acid route?
Lou said:Nice video, Kevin! I am typing this as I watch. Very barren filtrate--stannous it to make a point.
Handle the salt damp, never dry, and never sopping wet.
One nitpick but practical thing to mention, best just to use 15% ammonium chloride solution with perhaps 3% HCl, rather than conc. HCl. It is advisable to use a wash bottle rather than a spray bottle because less risk of misting out soluble platinates.
Another is don't bother removing the filter. Having it inverted like you did is just fine.
One thing to mention is that the fused quartz dish can just go over a flame without worry--or directly onto the metal elements. This will prevent you from contaminating the platinum with graphite.
anachronism said:Great video mate.
One thing though- given the choice between cyanide and Platinum I'm choosing cyanide. Platinum is so darned toxic it's unreal and the danger is that you don't see it coming. Even if I had a completely "pro" setup I'd drop the metal as metal impure and let someone else purify it, and if you ask any of the pros on here (apart from Lou who specialises in it and has spend a HUGE amount of money on safety) they'll say the same.
A great trial but do yourself a favour and leave it there ok?
With kind wishes.
Jon
This is worth repeating. Any hot, powdery Pt or Pt salt can adsorb / absorb / react with gases, carbon and other compounds very easily introducing contaminants into the once pure metal. So no graphite or silicon carbide crucibles should be used, and a vacuum or very controlled atmosphere when melting is desirable. Improper melting has produced many brittle buttons. Sometimes even changes in density of the perceived metal button occur. I.e.: Improperly melted buttons versus forged ones.Lou said:One thing to mention is that the fused quartz dish can just go over a flame without worry--or directly onto the metal elements. This will prevent you from contaminating the platinum with graphite.
I don't feel comfortable with this statement, as it may sound secretive or pretentious, when my intentions are, in fact, quite the opposite.cuchugold said:I don't like the use of ammonium chloride at all, but it is still very popular.
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