석유화학 공정 중 styrene monomer제조공정에서 발생되는 산화철 폐촉매는 산업 폐기물로서 전량 매립되고 있는데, 이를 출발원료로 사용하여 NiZn-페라이트를 합성하였고, 그 자기적 특성을 조사하였다. 출발 원료인 산화철 폐촉매는 산 처리와 CeO₂ 분리과정을 거쳤으며, 이렇게 정제된 산화철 폐촉매에 NiO및 ZnO를 혼합하여 900℃에서 하소하여 스핀넬형 페라이트를 합성하고 1325℃에서 5시간 소결하였다. NixZn1-xFe₂O₄(x=0.36, 0.50, 0.66)과 (Ni0.5Zn0.5)1-yFe2+yO₄(y =-0.02, 0, 0.02)의 조성에 대하여 초투자율을 측정하였고, S-parameter를 측정하여 반사 감쇄량을 계산하였다.
NiZn-ferrites were synthesized from the waste catalysts. which were by product of styrene monomer process and buried underground as an industrial wastes, and their magnetic properties were investigated. Nickel oxide and zinc oxide powders were mixed with finely ground waste catalysts, and spinel type ferrite was obtained by calcination at 900℃ and sintering at 1325℃ for 5 hours. The initial permeabilities were measured and reflection losses were calculated from S-parameters for the composition of NixZn1-xFe₂O₄(x=0.36, 0.50, 0.66) and (Ni0.5Zn0.5)sub 1-y/Fe2+yO₄(y=-0.02, 0, 0.02).
