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bfesser
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<strong>testimento</strong>, I've recieved several U2U complaints about the coarse language in your posts. Could you please try to swear
a little less?
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testimento
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Sorry. In my country it is a habit to curse a lot. I will correct my speech after this.
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ElectroWin
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really, stop thinking in terms of a voltage limited supply, and go with current limited.
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testimento
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If the device should work for longer periods of time, the efficiency must be taken into consideration. It is not sensible to build larger device which
efficiency lies somewhere between 15% and 20%. It wouldn't matter if electricity was a lot cheaper, I'd be using 3-phase with aluminium busbars.
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ElectroWin
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right, so consider some kind of switching power supply (typically > 80% efficient).
some discussion of the basic techniques may be found at http://www.microsemi.com/document-portal/doc_download/129605...
[Edited on 2013-7-18 by ElectroWin]
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testimento
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If the cell doesnt begin to give out decent yield with PbO2 at 4.5VDC, I will test out 24VAC device with expected output around 20VDC to see if it
would give better results.
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ElectroWin
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Quote: Originally posted by testimento  | | If the cell doesnt begin to give out decent yield with PbO2 at 4.5VDC, I will test out 24VAC device with expected output around 20VDC to see if it
would give better results. |
youre not getting it. again,
the chemistry is about the current density, not the voltage.
example: if your anode is 10 cm^2 surface area (= 0.001 m^2), and you need 400 A/m^2 current density to produce the right chemical species, then you
want the current to be 400 x 0.001 = 0.4A
and i hear of using as much as 3543.6 amp/m^2 in chlor alkali cells,...
-- http://support.olisystems.com/ApplicationBriefs/Briefs%20-%2...
[Edited on 2013-7-18 by ElectroWin]
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plante1999
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Anyone know a place to find the chlor-alkali chem study like video? I know it is pretty uncomplete question.
There was a chemist demonstrating mercury cell on a lab scale in the video. It is an old video.
[Edited on 21-7-2013 by plante1999]
I never asked for this.
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testimento
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How to heat up chlorate bath in plastic tank?
Any ideas how to heat up chlorate bath to 60-80C when the container is plastic?
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Pulverulescent
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The usual way of heating a chlorate cell is by adjusting the working current-density to an amperage that will heat the electrolyte resistively!
"I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones"
A Einstein
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bfesser
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<strong>testimento</strong>, instead of starting a new topic for every chlorate cell question you can think of, reply to one of your <a
href="http://en.wiktionary.org/wiki/Sagan" target="_blank">Sagan</a> <img src="../scipics/_wiki.png" /> existing threads.
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bfesser
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Threads Merged
22-7-2013 at 05:29 |
testimento
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Well I havent driven the test batches yet for so long the temperature would have risen, but I've gotta try and measure the temp next time. I have
understood that voltage plays a major role for temp losses, and since Im driving it close to the ideal voltage (4.5VDC) with intimately placed anodes
and cathodes, the temp losses may be quite minimal.
About the chlor-alkali, I tested that the both anode and cathode work, and surprisingly, some activity can be noticed at the cathode side, but anode
side doesn't give any hint of chlorine. This could indicate low or no current passing through, but the voltage is same on both sides and the cathode
giving hydrogen indicates that something is definitely going on there. The pot doesn't affect the current passing according to that.
Could a higher voltage be needed? Should I obtain a 24V power source and give a try with it?
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ElectroWin
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why are you ignoring my replies?
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Xenoid
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testimento - you are becoming a real PITA 
Please stop spamming the forum with your nonsense!
For some information on amateur anodes, please check out the Chlorate - Perchlorate site:
http://www.oxidizing.110mb.com/chlorate/anodes.html
Get in quick, as the site seems to come and go!
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testimento
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Sorry, I really missed your first post ElectroWin. I was in a hurry when I posted the chlorate temp topic and missed this and when bfesser merged the
topic I didnt notice your post. I'm gonna try driving very high anode currents soon.
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testimento
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Could gallium be used in chlor-alkali cell for a substitute of mercury?
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vmelkon
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I haven't tried it, but I imagine it would behave a little like Al if it comes into contact with NaOH solution.
From wikipedia
"Alkaline hydroxide solutions dissolve gallium, forming gallate salts containing the Ga(OH)4(− anion"
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testimento
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Well, I ordered some gallium already. So sad, gotta go with Downs cell then. 
I have understood that in CK cell the mercury should be agitated in order to drive the amalgam into the other side, and if it's not agitated, it would
just sit there and the electrolysis would come to cease.
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vmelkon
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I don't think the electrolysis would cease. Sodium mercury mixture is a metal. The problem would be that the sodium reacts with the water in the wrong
place (the electrolysis cell). In industry, they have pumps to push the mercury to some other section where they flow it on graphite balls with water
dumped in. The mercury than is pumped back to the cell.
I don't know if I posted this link before.
It shows how they do it in industry and also on a small scale.
http://www.youtube.com/watch?v=GtxiCZrLH8g
Signature ==== Is this my youtube page? https://www.youtube.com/watch?v=tA5PYtul5aU
We must attach the electrodes of knowledge to the nipples of ignorance and give a few good jolts.
Yes my evolutionary friends. We are all homos here. |
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testimento
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The reason I didn't go for the classic "rocking cell" is because I didn't have mercury available in reasonable price. Even a very small cell would
require a minimum of a liter, or 13.5kg of mercury in order to function properly. The rocker cell idea is simply to flow the mercury from compartment
to another to swirl the amalgam and allow it to surface with the differential cells. Even a tiny movement would be enough. Technical mercury is a
waste product and therefore should be available quite cheap, but because the draconic laws they all end up into lockdown.
My objective is to produce chlorine gas for chlorination and other purposes, so if anyone has got ideas how to separate chlorine from the mixture, I'd
be extremely happy. I dont mind the NaOH, because I can make it very cheaply from calcium hydroxide. My best bet so far is the downs cell, which
technically requires to smelt fused salts (NaCl:CaCl2 42:58), or then directly calcium chloride (MP 770C) and electrolyze it with carbon anode to get
chlorine out. I would pack the whole SS made cell into ceramic mantle and heat it up with nichrome to get it going. With firebrick base, aluminium
oxide lining, calcium sulfate body and rockwool insulation the whole cell should actually be quite efficient and maybe even self-sustaining once it
has got up to the required temperature. Pure CaCl2 has 64% of chlorine in weight.
[Edited on 15-2-2014 by testimento]
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