Method for reducing oxidation state iron into simple substance iron by using glycerol

The invention relates to a method for reducing oxidation state iron into simple substance Fe by using glycerol. The method comprises the following steps of: adding biomass glycerol, alkali and the oxidation state iron into a reactor; and when the addition amount of the glycerol and the alkali is over 5 times that of the iron element in the oxidation state iron, converting the oxidation state iron into the simple substance Fe and converting the glycerol into lactic acid and hydrogen simultaneously at the reaction temperature of between 200 and 350 DEG C for 10 to 12 hours. The method converts the oxidation state iron into the simple substance Fe in high efficiency and low consumption, can effectively solve the problem of converting the simple substance Fe into Fe3O4 in the process of hydrothermally reducing CO2 into an organic matter by using Fe and the problem of consumption of the simple substance Fe in the processing of reducing water to product hydrogen by using Fe, and effectively accelerates the improvement of traditional iron-making technology. Meanwhile, the method realizes the resource and energy conversion of the biomass glycerol, has great development potential and popularization and application value, and can be applied to converting the oxidation state iron into the simple substance Fe by using the biomass glycerol and simultaneously converting the glycerol into high-utilization value organic lactic acid and new energy hydrogen.