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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 2 O 3  particles. Changing the pyrolysis conditions will affect the purity and concentration of Fe 2 O 3  particles. In this paper, physical experiments and numerical simulations were carried out to study the effect of pyrolysis conditions on the Fe 2 O 3  particles, including the pyrolysis temperature, the FeCl 2 /FeCl 3  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 2 O 3  particles. When the ratio of FeCl 2 /FeCl 3  in the pickling liquor was 1:1.5, the maximum concentration of Fe 2 O 3  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 2 O 3  particles at the outlet was achieved.

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