Study On Preparation Of Fe₃O₄Magnetic Powder For Developer By Waste Steel Pickling

Steel pickling waste liquid pollution is one of the serious problems of environmental protection and resource recycling. This paper mainly discusses the method to treat waste, optimization of a new technology of comprehensive utilization of waste pickling liquor:preparation for developer Fe3O4magnetic powder by iron oxide conversion technology.Firstly, laboratory studies of waste steel pickling liquor preparation for developer Fe3O4magnetic powder is discussed. The products were characterized by X ray diffraction, scanning electron microscopy and transmission electron microscopy, and tested their magnetic properties at room temperature. The influences of reaction temperature, reaction pH, aging pH preparation conditions on stability, the phase, morphology and magnetic properties of Fe3O4powder were discussed. Research results show that:the reaction of pH=7-8; the reaction temperature T=80-90℃; the aging pH=8-9, can get high purity, good morphology and magnetic properties of Fe3O4magnetic particles.Then the obtained laboratory study conclusions applied to industrialization. With purification of pickling waste liquor of an industrial district in Tianjin, further optimization of the process equipment and parameters, using special additives to produce high magnetic developer Fe3O4powder products. This paper analyzed of the material balance in industrial engineering, and comprised of laboratory research and industrialization parameters. The control of morphology and particle size in the production process of industrialization, and industrial conditions’ influence on the magnetic properties of Fe3O4were discussed. This paper also comprised the physical and chemical properties of products between home and abroad as well as the magnetic properties.According to the experimental results, combined with the industrial production, this paper was prepared with the industrial application in preparation developer Fe3O4magnetic from steel pickling waste liquor, and analyzed the social, economic and environmental benefits.