Recovery of Gallium from Sodium Aluminate Solution in Bayer Process

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Habibi, Amir | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46626 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Yoozbashi Zadeh, Hossein
Abstract:
Gallium is a rare and precious metal that is of particular importance in the electronics industry due to its use in semiconductors. This metal is partially present in bauxite ore. Around 70% of gallium go into sodium aluminate solution during the leaching of bauxite in the Bayer process. Gallium can be extracted from this solution, which is also called bayer solution, by several methods. Solvent extraction is one of the most common methods for recovery of gallium from Bayer's solution. Capabilities of this method for metals separation and concentrating of polymetallic solution, makes it suitable for many commercial and operational application. In present work, different substances used to gain highest extraction percentage. Obtained results show that more than 62% of Gallium can be recovered by using acetyl acetone and benzene as extracting agent and diluent respectively. Experimental conditions that lead to this result was diluent to extractant ratio of 5, aqueous to organic ratio of 0.5 and 10 minutes as extraction period. Finally whole the process was optimized according to CCD method using DOE software
Keywords:
Bayer Solution ; Solvent Extraction ; Benzene ; Central Composite Design ; Gallium ; Acetyl Acetone

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