| 摘要 |
PROBLEM TO BE SOLVED: To provide a processing method of efficiently recovering gallium at low cost with the minimum amount of alkali hydroxide in an alkali fusion method for recovering gallium from an InGaZn waste material.SOLUTION: A method of recovering gallium includes pulverizing an InGaZn waste material into 5 mm square or less, adding and mixing alkali hydroxide of 1 to 2.5 times mol equivalent of 2 times total amount of gallium molar quantity and zinc molar quantity contained in the InGaZn waste material and then heating it to 250°C or more to obtain slurry, further adding water to exudate gallium and zinc, filtering to separate and collect gallium zinc-containing solution from indium-containing residue, adding an acid to the gallium zinc-containing solution to adjust pH to 12 to 13 for making zinc and indium in the solution to be a hydroxide precipitate and separating solid and liquid, then adding a sulfurizing agent to the solution to precipitate zinc in the solution as sulfide, applying solid liquid separation to recover the high purity gallium solution. |
