Abstract: A method for the recovery of copper, indium, gallium, and selenium is provided. The method includes steps of using a mixed solution containing a hydrochloric acid and hydrogen peroxide to dissolve the copper, indium, gallium, and selenium. After using the hydrazine to separate the selenium out, the copper is reduced by indium metal. Later, a combination of a supported liquid membrane (SLM) and a strip dispersion solution separates the gallium from the indium. The acid performed in all the steps of the method is hydrochloric acid. Therefore, the copper, indium, gallium, and selenium can be separated one by one in a single production line without changing the solution during the operation process, thereby simplifying the process, shortening the operation time and lowering the manufacture cost.

Abstract: The present invention provides a novel process for the removal and recovery of gallium from a feed solution containing the gallium and copper. The process of the present invention utilizes a combination of a supported liquid membrane (SLM) and a strip dispersion to improve extraction of gallium while increasing membrane stability and decreasing processing costs. This novel process selectively removes gallium from feed solution containing the gallium and copper.

Abstract: The present invention provides a process for the removal and recovery of indium from waste waters and process streams. The process of the present invention utilizes a combination of a supported liquid membrane (SLM) and a strip dispersion to improve extraction of indium while increasing membrane stability and decreasing processing costs. This novel process selectively removes indium from the feed stream, provides the increased flexibility of aqueous strip/organic volume ratio, and produces a concentrated strip solution of indium.