PREPARATION METHOD OF STARTING MATERIAL FOR PREPARING NI-ZN FERRITES USING ZN-NI PLATING WASTE SOLUTION, AND PREPARATION METHOD OF NI-ZN FERRITES USING STARTING MATERIAL

摘要

PURPOSE: A method for preparing the starting material for the preparation of Ni-Zn ferrites and a method for preparing Ni-Zn ferrites are provided, to recycle the Zn-Ni plating waste solution and to obtain more uniform Ni-Zn ferrites. CONSTITUTION: A starting material for preparing Ni-Zn ferrites is prepared by adding Fe¬2+ to the Zn-Ni plating waste solution to make the concentration 25-50 ppm; adding 0.5 mol times or more of oxygenated water based on the mol of Fe¬2+ to the waste solution; adding alkali to the solution to control the pH to be 3.5-5.5, thereby to generate sludgy; stirring the solution for 30 min to 3 hours at the temperature of 30-80°C to allow Si to be adsorbed; filtering the solution to remove impurities; adding NiCl2 to obtain the Zn_x Ni_(1-x) containing solution; adding KOH to the solution to control the pH to be 10-12 and to obtain hydroxide; filtering, washing and drying the hydroxide; and optionally heating the hydroxide at the temperature above 700°C to obtain Zn_x Ni_(10x) O powder. Ni-Zn ferrites are prepared by mixing the starting material with ferric oxide (Fe2O3) or copper oxide (CuO); and sintering the mixture at a temperature above 700°C.