| 摘要 |
The removal of silica from an iron-bearing source which is treated to produce an iron powder which may be used in powder metallurgical applications may be facilitated by subjecting the reduced iron-bearing source such as magnetite to a sparge with an oxygen-containing gas such as oxygen or air prior to a caustic leach step. The sparge of the caustic-magnetite slurry is effected at ambient temperatures and pressures which may range from about 10 to about 1000 psi for a period of time ranging from about 0.1 to about 1 hour. By utilizing this sparge, the leaching capacity of the caustic leach solution appreciably increased.
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