| 摘要 |
PURPOSE:To obtain powder having high bulk density and excellent packing property by a method wherein iron oxyhydroxide powder or iron oxide powder is suspended into water, a high molecular flocculant is added into water, iron oxyhydroxide powder or iron oxide powder is coagulated, and the powder is baked and reduced. CONSTITUTION:Iron oxyhydroxide powder or iron oxide powder is suspended into water, and the high molecular flocculant is added into the suspension and iron oxyhydroxide powder or iron oxide powder is coagulated. The powder is baked and reduced. Substances up to a high polymerization rate of several million molecular weight from a low one of not less than one thousand molecular weight are used as the high molecular flocculant, and sodium alginate, etc. are cited. The high molecular flocculant is used within a range of 0.1-2wt% to iron oxyhydroxide powder or iron oxide powder in the water suspension. alpha-FeOOH powder, alpha-Fe2O3 powder, gamma-Fe2O3 powder, Fe3O4 powder or powder corresponding to these intermediate type or the like is cited as iron oxyhydroxide powder and iron oxide powder, and powder having excellent needle property is used. |
