I will do a light washing with very dilute HCL and hot water but i think it doesnt matter..
I rellay think , that to much care is not advisable.
If you work with larger qty's of electrolyte, work with PE/PP buckets and for filtration i use some white weeds fleece and do a lot and a lot of filtrations...
One Before the run, after replenishment with NaCl, after the run maybe twice ore more times and mostley with dual layer of the fleece to get rid of the elecrode material and other stuff like hairs.
The KCL solution is also filtered and after both solutions are put together i do another filtration if there has not a bunch of crystals formed yet.
With many filtrations you'll get a quite clean product and large Crystals..
The last run gave me 6cm large, crystal clear flakes of Clorate.
My problem is the wear of the Cathodes.. after a run i can break them with a bit of bending.. i think its not grade one or two Titanium but i really dont care about some erosion products..
I think to much care about contamination will make you crazy.. specially if you have got a dog with many hairs^^
My filtration setup is very easy.. just the fleece on the bucket assured with a rubber band.
It has to be damped first, or you get no flow!
But when its working, its not a big deal, to filter more than 10liters in a short period of time.
Its also very easy to filter when you do a recrystalisation because its fast and nothing will get blocked.
After every filtration step, you can wash the fleece with water or if you have got enough, take one for every step and wash them all together for the next time you need them.
Its also a good idea to take an PP or an Acrylic tube with fleece->filter cotton manteled with fleece-> activated charcoal-> Fleece to get a very very clean electrolyte.
With a big diameter youll get a good flow in the filtration system and the media has not to be changed too often.
I do it this way before i put everything(washing water, recrystalisation water, desaturated electrolyte and so on) together in a big tub for evaporation, when nothing is in progress .
Then you've got a very clean electrolyte and as it evaporates large crystals will form.
I've harvested more than 30l in the last Year and now there is a 3-4cm layer of Chlorate at the bottom..
You have to take it out several months because at some point NaCl will start to fall out and will contaminate your "post-product" which is normaly the most cleanest which don't have to be recrystalised in my opinion.
For heating i have built a immersion heater from two 230V/1,5kw Heat spirals connected in series for a lower wattage, since it gets hot enough to destroy the PTFE easily.
Ive put them in a PTFE tube (10x1) with a little bit of transformer oil.
The problem with this idea is the fluid in your tube... if you dont use it, the PTFE will get to hot at some places and will get destroyed i think. But with oil you have the problem of boiling oil in a tube.
This causes bubbles to build up and the oil gauge will rise continously if you dont provide a form wich allowes every bubble that forms to get to the top of the liquid. This is impossible if you make a simple spiral, so i use only that much oil, that it can boil the entire way in my heating spiral without a rising of the oil gauge.
(i hope you can understand what im trying to say )
This is a great way to boil 2-10liters of electrolyte or anything other corrosive stuff you might want to boil. ( my first attempt with this techique was some years ago with a boro. glass tube for a solution of CuSo4)
I had also the case, that boiling oil leaked out of the top of the PTFE immersion heater direktly into the electrolyte but with several filtrations with the fleece i got rid of it ..also i had some contamination wit Loctite (for the screws in the bottom of the tank which i had to remove last time) which was no deal for the fleece.
for oily contaminations a cotton T-shirt might also work great.
If you are now in a new mania of making high purity ClO3/4 please take a look, that your fleece is made from PP/PVC/PE or any material which will withstand the corrosive environment of the Chlorate industry.
Edited by PTFE, 09 January 2017 - 03:07 PM.