| 摘要 |
PURPOSE:To remarkably reduce the cost of manufacture by a method wherein neutralizing oxidation is performed by adding a V compound into a ferrous salt solution to prepare alpha-FeOOH containing V. CONSTITUTION:Neutralizing oxidation is performed by adding a V compound into a ferrous salt solution, and alpha-FeOOH containing V is prepared. After performing treatment additionally adhering an oxide or a hydrate of one or more kinds of Ni, Co, Zn, Mn, Cr, Ca and Si, and a V compound, if necessary, to the alpha-FeOOH, dehydrating reduction is done under H2 gas current. In this way, metallic powder having physical and chemical stability and high magnetic characteristics and comprising iron as a main component is obtained. This manufacturing method can prepare alpha-FeOOH having good acicular and uniform particle size from a relatively impure ferrous salt solution. Furthermore, since reduction can be executed with a very small amount of H2, the cost of manufacture can be remarkably reduced. |
