Synthesis and adsorption properties of high specific surface area strontium ferrite from Industrial Strontium Residue

A kind of hard-magnetic material, strontium ferrite (SrFe12O19) was prepared using Industrial Strontium Residue (ISR) as starting material. To optimize the conditions of recovery ratio of strontium element, the orthogonal design was carried out. The results showed the recovery ratio reached to 96.73%. The processes of recovery and preparation were suitable to industrial production. This research was therefore expected to reuse efficiently the ISR and prevent its environmental pollution. The prepared products were characterized by FTIR, XRD, SEM, and VSM. The results indicated the prepared SrFe12O19 could be classified as hexagonal crystal with a better magnetic property. The Langmuir and BET models were separately used to calculate the specific surface area of the prepared SrFe12O19. The error analysis was performed by a comparison between experimental data and value calculated. These investigations revealed BET adsorption equation was more suitable for the surface area analysis of SrFe12O19. The N-2 adsorption on the surface of SrFe12O19 could be categorized as multilayer adsorption. The specific surface area (BET) of SrFe12O19 was 31.2434 m(2)/g. (C) 2013 Elsevier Ltd. All rights reserved.