IMMOBILIZATION OF FLUORINE AT THE DOLOMITE GEOCHEMICAL BARRIER

The possibility of using of dolomitic geochemical barrier to integrated treatment from fluorine of the alkaline waste water of coal heating enterprises was experimentally proved. It was established that residual fluorine concentration at pH 10,4–10,6 conforms to the optimum for drinking water (0,7–0,9 mg/l) whereas degree of fluorine removal from solution at pH >12,0 is maximal and makes 99,2% at the residual fluorine concentration <0,1 mg/l. The optimum residual fluorine concentration is reached at the stoichiometric surplus of dolomite above reactive CaO in ashes and slag waste. It allows to calculate necessary capacity of the dolomitic barrier on chemical composition and intensity of formation of the last.