Mn-Zn ferrite powders have been produced from Electrolytic Manganese Residue (EMR) via chemical co-precipitation method combined with ceramic method after leaching EMR in sulfuric acid and purifying the obtained solution. The effect of temperature on synthesis ratio of precursor was studied. The crystalline phases and the specific surface area of the SiO2-doped samples were characterized respectively by X-ray diffraction (XRD) and Specific-surface-area Instrument of Brunauer-Emmett-Teller (BET). In addition, the magnetic measurements were carried out on vibrating sample magnetometer (VSM). The...