A PROCESS FOR THE PREPARATION OF NICKLE-CADMIUM FERRITE FROM SPENT NI-CD BATTERIES

摘要

The present invention provides a process to recover nickel and cadmium in the form of a high value product as Ni-Cd ferrite from spent Ni-Cd spent batteries. The spent battery is dissolved completely in nitric acid assisted sulphuric acid solution.The nickel and cadmium value present in the leach solution is directly converted to a high value Ni-Cd ferrite product through hydrothermal precipitation without any additional purificationltreatment step. Very uniform nano size Ni-Cd ferrite with high magnetization value of 60.9 emulg and remnant magnetization value of 5.7 emu/g is produced and reported in this patent. Ni-Cd ferrites are a group of technologically important materials that are used in the fabrication of magnetic, electronic and microwave devices.