FIELD: chemical industry, inorganic chemistry. SUBSTANCE: method involves making Na2SO4 melt and its pouring into reactor. Temperature is maintained at the range 850-1100 C by voltage control and current power alternation. Detachable package of steel electrodes is used as iron-containing matter. Compressed air is bubbled through melt. Invention can be used for making oxidizing agents used for ore processing, sewage treatment from arsenic and depleted cyanides. EFFECT: industrial production of ferrate-4 sodium, decreased cost. 2 tbl, 3 dwg
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