| 摘要 |
<p>Gallium is recovered from an alkaline solution of a gallium compound by reacting the solution with an alkali metal amalgam to reduce the gallium compound to metallic gallium, the metallic gallium being taken up by the amalgam and alkali metal of the amalgam reacting to form the hydroxide which dissolves in the solution, and separating the gallium-containing amalgam from the solution. The solution may be one obtained by digesting gallium-containing bauxite with caustic soda solution to form a solution containing sodium aluminate and sodium galliumate, and the amalgam may contain 0,35% to 2,0% by weight of sodium and may be introduced as droplets of diameter between 0,15 and 1,5 mm. The gallium may be recovered from the separated amalgam by reaction with nitric acid or sodium hydroxide solution and the solution electrolysed to precipitate the metal. The amalgam from which the gallium is removed may have more sodium incorporated in it and returned for further use in a continuous process.</p> |
