Synthesis Of Nanometer-sized Magnetic Black Iron Oxide Pigment By Using Dust Of Steel Industry

This article summarized recently comprehensive utilization of dust and development state and utilization of iron oxide pigments in market, and introduced mainly the prospect of application and development at home and abroad. Preparation method took neutralize precipitation method,This study prepared nanometer-sized magnetic black iron oxide pigment through processes of neutralizing→precipitating→oxidation→addition with the mix liquor of Fe2(SO)4 and FeSO4 obtained by sulfuric acid leaching dust as starting material. The best technological conditions were determined, such as the total iron density in starting material, molar ratio of Fe3+ ions and Fe2+ ions in starting material, density of precipitant, style and speed of adding precipitant, reaction temperature, reaction time and etc. This article discussed preliminarily the factors to influence the particle shape, dimensions and distribution of particle size by analyzing and studying TEM pictures of pigment particles, and discussed the factors to influence characteristics such as specific surface area, oil absorption, covering power and so on. By the measurement of the Fe2+ ions concentration during the reaction process, components of Fe(OH)2 in precipitance regularity was obtained, furthermore, reaction kinetics and activity energy of Fe(OH)2 oxidation reaction at different temperature were determined. This article analysis dehydration process and oxidation process by TG-DTA analysis, and explain the formation process of γ-FeOOH and Fe3O4 from their structures, discussed preparation mechanism and magnetic mechanism of Fe3O4. were determined by measuring, and its saturated magnetization is better than that in given data report. The main characteristics of pigments were analyzed by chromometer, XRD, TEM, BET, magnetometer and so on, quantity of pigment and main characteristics are better than that of black iron oxide pigment on market and reached criterion and standard.The significance of this study is in that we create a new method with Fe2(SO)4 and FeSO4 mixture solution as starting material and break traditional method by adding crystal seeds and used the neutralization precipitation method to get black iron oxide pigment, this method is simple and effective and the process is feasible.