Abstract
The steel pickling liquor is formed by HCl, washing water and a high content of Fe(II). This liquor is mixed with a Ba(II) solution in a stoichiometric rate to produce a precursor powder to obtain BaFe 12 O 19 . In all cases we obtained a mixture of BaFe 12 O 19 and α-Fe 2 O 3 . The qualitative and quantitative analyses were made by XRD and the magnetic properties were measured by VSM technique. We will report the relation between the oxi-coprecipitation process conditions and the magnetic properties and the role of NaCl during the calcination step. NaCl was formed from dissolution in the oxi-coprecipitation process. NaCl originates structural defects in the powder so, the solid state reaction, during the calcination process, is improved. An excess of NaCl didn't increase the magnetic properties and promoted by-products formation so the Fe/Ba rate is stoichometric but calcined products had low magnetic properties.
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