Oxidation of ferrous to ferric ion by additives in bubble column

This study discusses the convert of ferrous sulfate to ferric sulfate by oxidation whit using the bubble column and concentrates by using air and then studies the effect of additives to complete the oxidation. Air is used as an oxidation agent to study the oxidation reaction in bubble column with (5 cm inside diameter, 120 cm tall), in this part of process, studying the operation condition on the oxidation and determining the rate of conversion . Temperature ( 50,60 and 70 )°C ,air flow rate (100,150,200 and 250)liter /hour and initial concentration of ferrous (0.5 , 0.25 , 0.1 and 0.05 ) moles with fixing the pressure slightly up to 1 atmosphere are used to study the performance of the parameters (initial concentration ,temperature and air flow rate on oxidation ferrous sulfate .The effect of these conditions is studied throughout the experimental work to increase the conversion rate of ferrous .The results are shown that the maximum conversion rate is 53.5% at the temperature 70 °C ,air flow rate 150 liter /hour and initial concentration of ferrous is 0.1 moles. The results of the optimum conditions are depended on the second part of this work by using an additive material, (CuSO4, KMnO4, H2O2 and HNO3) at the different concentration (100 , 200 , 300 , 400 , 500 ) ppm, the effect of each material is studied to show the conversion rate of ferrous to ferric sulfate. The test of these material gave verifying results for each material and gave verifying result for each concentration of additive on the conversion rate of ferrous .The best result is that the conversion rate is 81.1 % by using CuSO4 at additive concentration 400ppm, the conversion rate is 78.9% by using HNO3 at concentration of additive 200 ppm , the conversion rate is 73.1% by using KMnO4 at concentration of additive 400 ppm and the conversion rate is 70% by using H2O2 at concentration of additive 200 ppm. Mathematical correlation for each additive and the main operating variables on oxidation of ferrous to ferric sulfate are solved by using (Excel) program are illustrated: −d[Fe+2]dt=0.412031t+0.182914T-0.00967Q-5.37142Co+0.019077Cadd-3.82844