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http://dx.doi.org/10.7844/kirr.2014.23.6.63

Method for Making High Purity Gallium by Electrowinning  

Choi, Young-Jong (TSM Co. Ltd.)
Hwang, Su-Hyun (TSM Co. Ltd.)
Jeon, Deok-Il (TSM Co. Ltd.)
Han, Kyu-Sung (KICET)
Publication Information
Resources Recycling / v.23, no.6, 2014 , pp. 63-67 More about this Journal
Abstract
Gallium is an important material and is used by industry of oxide semi-conductor and LED chip. However, the most of the gallium-containing waste resources became outflow abroad and the most of which is imported from oversea by following technical problem and low circulation rate. In this research, the recovery of high purity Gallium metal from Gallium scrap, which containing about 30% of Gallium, was investigated by using hydro-metallurgical process. As pretreatment, the Gallium scrap was pulverized and leached by strong acid such as hydro chloric acid. At the leached solution, Indium was separated as an Indium sponge by substitution reaction and then Gallium and Zinc hydroxide separated and filtrated using strong alkaline solution such as sodium hydroxide by precipitation method. Also, Gallium metal and Zinc metal was recovered by electrowinning method. To make an electrolytic solution, Gallium and Zinc hydroxide was leached by strong alkaline solution. Finally, High purity Gallium metal was recovered by vacuum refining process to remove the Zinc impurity.
Keywords
Gallium; scrap; electrownning; purification;
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