Abstract: This paper introduces purified FeCl₂ solutions which are obtained through the leaching of scale in hydrochloric acid solution and removing impurity with iron powder.The optimal reaction condition for preparing clean ferrous chloride solution could be achieved while hrdrochoric acid concentration is 6mol/l,leaching temperature is 80℃,leaching time is 30min,hydrochloric acid excess coefficient is 1.74.The leaching recovery of iron could be 94.5% under the above reaction conditions.The optimal reaction condition for preparing iron oxide using sodium carbonate as precipitator is as follow: FeCl₂ concentration 0.8mol/l,CO₃^2-:Fe²⁺mole ratio 2,reaction time 60 min,reaction temperature 40℃,agitating rate 250r/min.The precipitate is desiccated 1hour at the temperature of 60℃,then being calcined 2 hour at 700℃.The powder of the ferric oxide obtained is spindle and well dispersed and the average grain size of the powder is around 47nm.