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Journal of the Korean Ceramic Society 2001;38(5): 401. |
| Synthesis of Barium Ferrite Powder by the Coprecipitation Method using Iron Pickling Waste Acid |
| Youngjae Shim , Dong-Whan Kim, Guk-Tae Kim |
| Division of Materials Science Engineering and Research Institute of Industrial Technology, Gyeongsang National University |
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| ABSTRACT |
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Barium ferrite powders were synthesized by the coprecipitation method using iron-pickling waste acid (IPWA) and BaCl$_2$$.$2H$_2$O as raw materials. Fe$^$2+/ ions in the IPWA, which contains both Fe$^$2+/ and Fe$^$3+/ ions, were oxidized into Fe$^$3+/ ions using H$_2$O$_2$. Proper amount of BaCl$_2$$.$2H$_2$O was dissolved into the oxidized IPWA. Using NaOH, Ba$^$2+/ and Fe$^$3+/ ions were coprecipitated as Ba(OH)$_2$and Fe(OH)$_3$. The coprecipitated Ba(OH)$_2$and Fe(OH)$_3$were washed and dried. Barium ferrite powders were obtained by calcining the dried Ba(OH)$_2$and Fe(OH)$_3$mixture from 400$^{C}$ to 1000$^{C}$ with a 100$^{C}$ interval. Barium ferrite powders were characterized by X-ray diffraction, SEM, and VSM. It was found that barium ferrite powders could be synthesized at around 630$^{C}$. The synthesized barium ferrite powders showed hexagonal plate shapes with a fairly uniform size. The barium ferrite powder calcined at 900$^{C}$ showed good magnetic properties, saturation magnetization of 67emu/g and maximum coercivity of 5000 Oe. |
| Key words:
Barium ferrite powder, Coprecipitation, Iron-pickling waste acid |
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