| 摘要 |
An efficient method is proposed for the recovery of a trace amount of a gallium value from an aqueous solution containing a large amount of an aluminum salt as the principal solute as in the solution which is prepared by dissolving the precipitates obtained by neutralizing a Bayer's solution with carbon dioxide in hydrochloric or sulfuric acid. The method comprises admixing the aqueous solution with a water-soluble ferrocyanide compound, e.g., sodium ferrocyanide, as a precipitant of gallium ferrocyanide in such a controlled small amount as not to exceed 2.5 times by moles of the gallium ions in the starting solution so that coprecipitation of aluminum ferrocyanide is minimized.
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