The Production of Hematite Powder from Spent Pickling Hydrochloric Acid

Thanapon Chandakhiaw; Chaiyasit Longbutsri; Natcha Wongnaree; Sirunya Somla; Napat Mahiwan; Tapany Patcharawit; Sakhob Khumkoa

doi:10.4028/p-sjK581

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HomeMaterials Science ForumMaterials Science Forum Vol. 1099The Production of Hematite Powder from Spent...

The Production of Hematite Powder from Spent Pickling Hydrochloric Acid

Abstract:

This research aimed to study the recycling process and the feasibility of recovering iron as hematite or red oxide powder (Fe₂O₃) from spent pickling acid (hydrochloric acid). The spent hydrochloric acid waste from the pickling bath in the sheet rolling steel industry contains approximately 233 g of iron dissolved in one liter of the spent acid. To recover iron, 2 M NaOH was added to the spent acid until reaching pH 7. The iron was precipitated as iron oxide and/or hydroxide. Next, the oxidation of ferrous oxide was carried out by adding H₂O₂ 35%v/v to control the shade color. The precipitates were subsequently separated from the acid solution by a filter press. The precipitates were dried at 110°C for 24 h and calcined at 700°C for 2 h to synthesize and modify the crystallinity of ferric oxide. Ferric oxide was subject to water washing, where contaminating sodium chloride could be dissolved and filtered out. After drying at 110°C for 24 h, high-purity hematite was achieved. Hematite recovered from the spent pickling acid via this process provided more than 97% purity at 94.4% recovery.

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Periodical:

Materials Science Forum (Volume 1099)

Pages:

181-187

DOI:

https://doi.org/10.4028/p-sjK581

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Online since:

October 2023

Authors:

Thanapon Chandakhiaw, Chaiyasit Longbutsri, Natcha Wongnaree, Sirunya Somla, Napat Mahiwan, Tapany Patcharawit, Sakhob Khumkoa*

Keywords:

Hematite, Iron Oxidation, Precipitation, Red Iron Oxide Pigment, Spent Hydrochloric Acid

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