When I started my sodium chlorate experiments, it was because of the lack of availability to me of pure material to use
for the production of sodium perchlorate which I could easily convert to potassium perchlorate.
Before I started my new setup, I made a large quantity of NaCl brine. For this, I acquired a good amount of low cost, sea salt, water softener salt.
When I dissolved this material, right away I saw a problem. Not only did I see the normal rust chunks and small pebbles, but worse was a lot of fine, beige-colored silt in the bottom of the brine tank.
After filtering out the obvious debris, I determined to chemically treat the clear brine I had left, before running it in my large cell.
I made a 1N solution of sodium carbonate and added roughly 350ml to each 5 gallon bucket full of clear brine (about 18 liters in each bucket), which immediately turned milky white.
After waiting overnight, the fine white precipitates settled to the bottom of the buckets. I next carefully decanted the purified clear brine off the top of the sediment and then vacuum filtered the residue.
Next, I tested the pure brine and found it to be quite alkaline, so I treated it with dilute hydrochloric acid till it was neutral to slightly acid. Now my brine was pure enough to run in the sodium chlorate cell.
The sodium chlorate crystals harvested from the first run were very clear and nice. I attribute their appearant purity to the refining of the brine prior to running the cell.
I feel it will only improve the quality of the potassium perchlorate I hope to make if I take the extra steps to purify the potassium chloride brine I plan to use in the conversion of sodium perchlorate solution to the potassium salt.
To facilitate the potassium chloride purification step, I acquired a quantity of high purity potassium carbonate.
The next step will be to filter and treat my potassium chloride brine, then filter out any precipitated contaminants before neutralizing the resulting clear brine.
More to follow...
Edited by WSM, 27 May 2019 - 07:07 AM.