Taiwan research team developed a gallium containing waste sapphire substrate resource recovery method"

Commonly used in the mobile phone panel, senior watch surface of the sapphire substrate no recycling, Taiwan Graduate Institute of environmental engineering professor Li Qinghua research team developed the gallium containing waste recycling method of sapphire substrate, the sapphire substrate waste grinding, impregnation dissolution, and then filter out the liquid and solid product three two aluminum oxide, but when refractory bricks and building materials. In addition, the liquid part of electrolysis, in addition to produce high purity gallium, the remaining electrolyte solvent is added to adjust the pH value as long as it can be, the precipitate containing gallium compound, make sapphire substrate abandoned completely recovery.

Professor Li Qinghua said that the high hardness of sapphire substrate, is not easy to scratch, commonly used in mobile phone panels, sapphire sapphire surface of the senior watches, in addition, the sapphire substrate can be made of gallium plated LED blue chip. There are about 80% LED using the sapphire substrate, the production process of waste is the waste containing gallium sapphire substrate, the emerging waste brought the development of high-tech industries, has not recovered better, in order to avoid environmental pollution, so he led the students development of recycling of waste metal gallium in the sapphire substrate.

Professor Li Qinghua further explained, "method" substrate recycling sapphire containing gallium was to waste recycling operation blue LED industrial process waste derived, the metal gallium one kilogram to five thousand yuan price of about four thousand NT, the recovery operation not only can reduce the environmental pollution, also let the high-tech waste the valuable metal resources can be recycled.

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