You can also make Potassium Perchlorate by decomposition of K Chlorate, it is quite a good way to make the stuff and AFSIK it will not be contaminated with K Chlorate so long as you heat to the correct temperature. The KCl (byproduct) will be fairly easy to get out of the Perchlorate. See Wouters page.
Potassium Perchlorate can also be made by electrolyzing Potassium Chlorate in a similar manner to that used for Sodium Chlorate. The solubility of Potassium Chlorate is low and the concentration of Chlorate in the cell will be low and you will have to use large volumes of solution if you want large weights of product. You will also get lower current efficiency, the Perchlorate will ppt out as it is formed and may even encrust the anode. You will have to be careful and make sure that your finished product has all Chlorate removed. There is not much information regarding the manufacture of K Perchlorate via electro synthesis in the literature. Some have suggested that it is erosive on Lead Dioxide anodes but this is not confirmed.
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Other compounds may be used instead of KCl, for example K sulphate and K Nitrate but if you use the Chloride the by product is NaCl which can be fed back into the recrystallizing stage. It is better to feed back this solution to the recrystallization stage as opposed to the Sodium Chlorate cell. If you feed it back to the cell you may get K Chlorate being precipitated and it is hard to clean up the K Chlorate from cell discoloureds. It is not critical though.
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