| 摘要 |
PURPOSE:To subject FeCl3 to back extraction in high back extraction ratio and to make it possible to produce high-purity iron oxide in high efficiency and in high purity, by subjecting FeCl3 to back extraction from an ion association solvent having extracted FeCl3 by the use of an aqueous solution of NH4OH. CONSTITUTION:FeCl3 is extracted with an ion association solvent such as methyl isobutyl ketone, etc., from an aqueous solution comprising FeCl3 such as one obtained by oxidizing acid washing waste liquor of hydrochloric acid for steel plate, etc., as a main component by the use of the ion association solvent under an acidic condition of hydrochloric acid. From the extracted solution FeCl3 is subjected to back extraction by the use of an aqueous solution of NH4OH into the aqueous solution of NH4OH. Then the solution of back extraction is neutralized with NH4OH water to form Fe(OH)3 precipitate, which is dried and calcined to produce high-purity Fe2O3. FeCl3 can be subjected to back extraction in high back extraction ratio by using the aqueous solution of NH4OH, therefore this process is advantageous in terms of yield and treatment cost can be reduced by increase in iron concentration in the solution of back extraction. The prepared Fe2O3 has >=99.9% purity and can be adopted as raw material ferrite for high-performance electronic parts.
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