AUTHOR=Lv Chao , Sun Ming-He , Yin Hong-Xin 

TITLE=The Effect of Pyrolysis Conditions on the Preparation of Fe2O3 Particles Using Simulated Pickling Liquor in a Venturi Reactor

JOURNAL=Frontiers in Materials

VOLUME=8

YEAR=2021

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.733257

DOI=10.3389/fmats.2021.733257

ISSN=2296-8016

ABSTRACT=<p>Large amounts of pickling liquor are produced during the pickling of iron and steel. The Venturi reactor is used during the pyrolysis of pickling liquor to prepare high-purity Fe<sub>2</sub>O<sub>3</sub> particles. Changing the pyrolysis conditions will affect the purity and concentration of Fe<sub>2</sub>O<sub>3</sub> particles. In this paper, physical experiments and numerical simulations were carried out to study the effect of pyrolysis conditions on the Fe<sub>2</sub>O<sub>3</sub> particles, including the pyrolysis temperature, the FeCl<sub>2</sub>/FeCl<sub>3</sub> ratio in the pickling liquor, and the citric acid ratio. The results showed that a product with a higher purity, better crystallinity, and greater concentration was obtained at 923 K. Further increasing the temperature did not change the concentration of Fe<sub>2</sub>O<sub>3</sub> particles. When the ratio of FeCl<sub>2</sub>/FeCl<sub>3</sub> in the pickling liquor was 1:1.5, the maximum concentration of Fe<sub>2</sub>O<sub>3</sub> particles at the outlet was obtained. When the added proportion of citric acid was 1:1, the particle size distribution was more uniform, and when the added proportion was 1:2.5, the maximum concentration of Fe<sub>2</sub>O<sub>3</sub> particles at the outlet was achieved.</p>