SYNTHESIS OF BAFE12O19 BY OXI-COPRECIPITATION FROM HYDROCHLORIC STEELPICKLING LIQUORS

The steel pickling liquour is formed by HCl washing water and a high c ontent of Fe(II). This liquor is mixed with a Ba(II) solution in a sto ichiometric rate to produce a precursor powder to obtain BaFe12O19. In all cases we obtained a mixture of BaFe12O19 and alpha-Fe2O3. The qua litative and quantitative analyses were made by XRD and the magnetic p roperties were measured by VSM technique. We will report the relation between the oxi-coprecipitation process conditions and the magnetic pr operties and the role of NaCl during the calcination step. NaCl was fo rmed from dissolution in the oxi-coprecipitation process. NaCl origina tes structural defects in the powder so, the solid state reaction, dur ing the calcination process, is improved. An excess of NaCl didn't inc rease the magnetic properties and promoted by-products formation, so t he Fe/Ba rate is stoichometric but calcined products had low magnetic properties.