A Process for the Recovery of Gallium from Gallium Arsenide Scrap

Abstract

The recovery of gallium (Ga) from gallium arsenide (GaAs) scrap using a leaching-ion exchange method was investigated. The ground GaAs scrap was leached, using 2.0 N nitric acid at 30 °C for 1.0 h, and the dissolution of Ga and arsenic (As) reached 98%. The pregnant solution with a 1/20 dilution ratio was then passed through a weak acid chelating resin Diaion CR-11. Highly charged Ga3+ has the ability to form complexes with the chelating resin and separate from the coexisting H3AsO4 in the leachate with very low pH. The loaded column was eluted with 0.1 M H2SO4, and the final concentrated solution had 4.5 g/L of Ga with 99.3% purity. The effluent from the column was further processed to remove As by ferric arsenicate precipitation, and reused continuously as the dilution water for raw leachate.

A Review on the Recovery and Separation of Gallium and Indium from Waste

“…The efficiency of the process depends on the concentration, temperature, solid-to-liquid phase ratio (S/L), and leaching time. With various combinations, it is possible to achieve up to 98-99% leaching efficiency [21,22,29].…”

“…Leaching is carried out in reactors equipped with a stirrer, usually at normal pressure. After the process is completed, the mixture is filtered, solid residues are separated, and the filtrate containing gallium ions is sent for further processing [29].…”

“…Various types of mineral acids and their mixtures are used to leach indium from ITO. The most popular ones are sulfuric acid and hydrochloric acid, although sometimes nitric acid is also used [23,24,29,[31][32][33]37]. Much depends on the way the material is previously processed.…”

Elastic, Optical, Transport, and Structural Properties of GaAs

“…With regards to the transport properties, two important questions that come up where the incorporation of dopants has been donea) mobility, b) effective carrier concentration [29,30].…”

Reciclagem de LED: recuperação de gálio por rota hidrometalúrgica.

“…O estudo de Zhao et al (2015) e Chaves et al (1995) realizaram a extração do Ga a partir de licor Bayer, com as resinas LSC7000 e ES-346, respectivamente. Já Cheng et al (2019), realizaram a recuperação do Ga a partir de licor de lixiviação de resíduo de GaAs, utilizando a resina Diaion CR-11.…”