Process for the Separation of Indium Oxide from Indium-Containing Compositions Using Mercaptocarboxylic Acids

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This patent describes a process for extracting and purifying indium oxide from mixtures containing indium compounds and other metallic impurities. The process involves converting these compounds into their oxides or hydroxides, calcining them, and then treating the calcined material with mercaptocarboxylic acids or their derivatives. The indium oxide remains as a solid residue, which can then be separated from the solution, resulting in a purer product.

Use CasesContent extracted from patent full text and abstract with AI.

• Recycling indium from electronic waste, such as used LCD displays or semiconductors
• Producing high-purity indium oxide for use in electronics manufacturing
• Treating industrial residues or ores containing mixed metal compounds to extract indium
• Environmental cleanup of waste streams containing indium and other metals

BenefitsContent extracted from patent full text and abstract with AI.

• Provides an effective method to selectively separate indium oxide from mixtures with other metals
• Enables higher purity of indium oxide, which is valuable for electronics and display industries
• Can be applied to recycling processes, supporting sustainability and resource recovery
• Uses mercaptocarboxylic acids, which may offer increased selectivity for indium over conventional methods

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Patent Abstract

Gegenstand der Erfindung ist ein Verfahren zur Gewinnung und/oder Reinigung von Indiumoxid aus Zusammensetzungen, enthaltend Indiumverbindungen sowie Verbindungen anderer, verunreingender ein-, zwei-, drei- und/oder vierwertiger Metalle, mit den Schritten: • Überführen der Indiumverbindungen sowie der Metallverbindungen in ihre Oxide und/oder Hydroxide, • Kalzinierung der Hydroxide und/oder Oxide, • Behandlung des kalzinierten Materials mit mindestens einer Mercaptocarbonsäure und/oder deren Estern und/oder deren Salzen in wässriger und/oder organischer Lösung, wobei die Lösung mit den Oxiden und/oder Hydroxiden beladen wird und wobei Indiumoxid als fester Rückstand verbleibt, • Abtrennung des indiumoxidhaltigen Rückstandes von der beladenen Lösung. Gegenstand der Erfindung ist außerdem die Verwendung von Mercaptocarbonsäuren zur Gewinnung und/oder Reinigung von Indiumoxid.