SHANGHAI, Aug. 19 (SMM) -- Demand for selenium dioxide will be positive due to stable EMM prices and stable operating rate at EMM producers. SMM expects, prices for selenium dioxide will be stable between RMB 760-770/kg in the following week. Prices for selenium powder quoted by overseas suppliers are slightly down, but domestic keep prices firm. SMM expects that mainstream prices for selenium powder will move in the RMB 1,060-1,100/kg range in the following week.