PURPOSE: To recover rapidly and safely Ga from dust generated in an Al electrolyzing furnace in a high yield by adding a secified oxidizing agent to the dust and carrying out oxidation leaching.
CONSTITUTION: The oxidizing agent such KMnO4, MnO2, H2O2, O3 or KCrO4 is added to dust having 0.08W0.3wt% Ga contane generated in the Al electrolyzing furnace, and oxidation leaching which a mineral acid is carried out to prepare a soln. contg. Ga. This soln. is adjusted to 4W5pH by adding alkali to form Ga hydroxide, and theis hydroxide is separated by filtraction and dissolved in hydrochloric acid. Ga is then extracted with ether and separated fromother metals. The solvent contg. the extracted Ga is subjected to back extraction with water, and the resulting aqueous soln. is hydrolyzed to deposite Ga hydroxide. This hyrdoxide is dissolved in an aqueous NaOH soln., and the soln. is electrolyzed to obtain metallic Ga of high purity.
MATSUI SHINGO
IKEDA HIDETSUGU
Next Patent: METHOD FOR RECOVERING GALLIUM FROM DUST GENERATED BY ELECTROLYZING ALUMINUM