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Registered Member #2648
Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291
frog: the method you prepose looks like what is called froth floatation, it is used for industrial seperation of minerals in the mining industry Search it. Don't know if it works with these chemicals though =\
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
If basic filter paper won't remove it try getting hold of some with a specified pore sizes. If that doesn't work, get smaller pore sized paper and work your way down. If the particles are still getting through you have a colloid. For that you need to flocculate the particles, which is to cause them to stick together into large clumps that can be easily removed.
I know home beer brewers sometime have problems with colloids and need to use flocculants to clarify their beverages.
Registered Member #1617
Joined: Fri Aug 01 2008, 07:31AM
Location: Adelaide, South Australia
Posts: 139
I have done quite a bit of experimentation with this: I used graphite at first, but I have found that even expensive lab filter paper wont get all the graphite out. Plus the low solubility of the chlorate means you generally need to filter the solution hot (unless you want to spend houurs and hours filtering many litres of solution...), and as it cools in the filter, the precipitate clogs everything...
The best way is to avoid graphite: Ive had alot of success with commercially made 'mixed metal oxide' anode. This can be abit on the expensive side of things though (compared to graphite). You can greatly reduce the graphite shredding by keeping the current density low (less than 30ma per square cm), keeping the solution cool (less than 40 degrees C) and keeping the ph low (less than 7). pH is the main killer for graphite.
Registered Member #2159
Joined: Thu Jun 04 2009, 10:12AM
Location:
Posts: 2
If you use graphite anodes you should stick to NaCl in the cell. This will produce the highly soluble sodium chlorate which is easily filtered from the carbon. Simply add KCl to ppt KClO3 from the clean filtered solution. Use freely available MMO anodes if you want to start from a KCl feed stock. Plenty of thos on the web.
Registered Member #1208
Joined: Thu Jan 03 2008, 05:30PM
Location: Chesterland, OH
Posts: 154
Can you link to a few plate type anodes. Everything I have found, apart from eBay seems to be a custom-order type thing. I am reluctant to use eBay because of the whole "big brother" issue, as well as the fact that it is $50 for a 2x6" mesh electrode. I have no prices to compare that to, and no information about the thickness of the coating.
Registered Member #2159
Joined: Thu Jun 04 2009, 10:12AM
Location:
Posts: 2
Hi Ramses, Sorry I have not been on the internet for a while. Look at the likes of the APC forum for work by Swede. He seems to be an authority on the subject. The electric pool chlorinators use MMO anodes and can be obtained second hand from time to time. In your neck of the woods Northstar Pyro sells suitable anodes.
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Seperating graphite and KCIO3
