METHOD OF RECOVERING BROMINE AND IODINE FROM NATURAL WATERS Russian patent published in 2002 - IPC

FIELD: water treatment. SUBSTANCE: invention relates to technology of obtaining iodine and bromine from natural waters and salines and can be used to recover these halogens from drilling and formation (associated) waters at oilfields and from lake and sea brines. Selective electrochemical oxidation of iodide is first performed in anode chamber of diaphragm-type electrolyzer in presence of ferrous ions at redox potential 550-850 mV, and oxidized iodide is then treated with alkaline agent (alkali or alkali-earth metal hydroxides or carbonates) within pH range 3.5-5.0 to induce coprecipitation of iodine on ferric hydroxide. Thereupon, selective electrochemical oxidation of bromide in iodine- free water is conducted followed by isolation of bromine by air desorption. EFFECT: reduced expenses due to avoided use of sorbents, simplified mounting and running of installation. 3 cl, 1 tbl