30 to 3000 magnetite

This work presented the extracted magnetite from waste mill scales through an eco-friendly and low-cost approach. The extraction of the magnetite involved two magnetic separation steps which were named as magnetite separation 1, and curie temperature separation technique. The magnetite is then used in removal of copper ions from an aqeous solution. Different milling times were used to reduce the size of the raw mill scale which is 24, 48 and 72 h. The increase in the milling time resulted in the homogenous dispersion of iron oxides particles, the reduction of particle clustering, and the reduction of distances between the particles. Magnetite was characterized using XRD, SEM and particle size distribution. Solubility of the iron oxides increased as the milling time increased. The concentration of copper ions was determined by a spectrometer. As a result, 72 hours milling time had shown highest adsorptions of copper which is 95 % removal efficiency at the optimum conditions. The characterizations of the millscales waste after the process having magnetite XRD spectrum and successfully reduced the size to microparticles. To conclude this, the price of millscales waste from RM30/kg now turned to magnetite can be up to RM3000/kg.