| 摘要 |
PURPOSE:To produce iron oxide having superior quality with high efficiency by cleaning and refining hematite ore or magnetite ore, then crushing to a desired particle size. CONSTITUTION:The concn. of hematite ore or magnetite ore 1 is adjusted in a concentration adjusting tank 2; ore <=10mu particle size is removed by classifying by the wet process in a cyclone 3, then the ore is classified with a hydraulic classifier 4, separated in a settling separator 5A, 5B to obtain a crude material having 10-250mu particle size distribution. Then, a reagent 6 such as alkali, fatty acid, kerosene, etc. is added to the slurry contg. the crude particles to adjust the pH to 6-10, then the particles are separated into concentrate 9A and tailing 9B on a Willfrey table 8. On one hand, the slurry contg. fine particles is separated into concentrate 11A and tailing 11B on a James table 10, and the pH of the concentrate 11A is adjusted to 9-10 by adding a reagent 13 such as alkali, collector, etc., and separated into concentrate 15A and tailing 15B by flotation 14. Thereafter, the concentrate 15A and the concentrate 9A are crushed to 0.8-2mu in a ball mill 16. |
