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cesium permanganate is a crystalline hydrate and the chemical compound with the formula CsMnO4. It is an insoluble salt.
It is obtained in the industrial production of cesium from pollucite and other cesium-bearing minerals such as kyanite, as described in US Patent No. 4,961,067, and in Bureau of Mines Report 650 (1970), “Cesium Recovery from Pollucite.”
The starting material is crushed and grinded finely to the size of the grain of table salt, then subjected to leaching-type digestion with aqueous sulfuric (H2 SO4) acid in a stainless steel or glass-lined reaction vessel at elevated temperature. Alternatively, a strong mineral acid such as nitric or hydrochloric may be employed in place of the sulfuric acid. The reaction mixture is reacted with a water-soluble permanganate reducing agent to form cesium carbonate and cesium delta manganese dioxide.
Alternatively, the solid cesium alum is added to a hot aqueous solution of permanganate and reacted with the excess of the reducing agent to form the cesium permanganate, which precipitates as the reaction is progressing. In either case, a critical stoichiometric excess of the reducing agent must be employed so that only cesium and permanganate ions are present in the resulting cesium permanganate.
In some instances, the aqueous permanganate solution is treated with an alkaline reducing agent such as methanol to form a slurry of cesium permanganate. The slurry is then reacted with the water-soluble cesium carbonate and the resulting cesium delta manganese dioxide is separated from the solution to obtain high purity cesium permanganate.