Recovery and separation of gallium(III) and germanium(IV ...

owing to the increasing importance of ga and ge in technological applications like electronics, optics, medicines, optical fibers and catalysts, the recovery of gallium and germanium from refining by-products has received an increasing interest in recent years ( schimmel et al., 2001, tyszczuk et al., 2007, depuydt et al., 2006, fujiwara et al., …

Process for the recovery of gallium and germanium from ...

A method is disclosed for recovering gallium and/or germanium from fly ash which comprises pelletizing the fly ash, treating the pellets in the presence of an oxidizing gas at a temperature of from about 900° C. to just below the fusion temperature of the pellets, treating the pellets in the presence of a reducing gas at the same temperature range, and recovering gallium and/or …

Recoveries of rare elements Ga, Ge, In and Sn from waste ...

The recycling and recovery of valuable metals from waste materials is one of the key issues in maintaining the sustainability of base and rare metals. Especially WEEE (Waste Electric and Electronic Equipment) can be considered as a high potential resource for a number of valuable and critical metals like gallium, germanium and indium.

Germanium Gallium Ore Leaching with Sulfuric Acid

Increasing Germanium Extraction. A sulfuric acid leach technique for extracting gallium and germanium from Apex ore without the use of a reducing agent, such as SO2, was investigated. Leaching studies showed that with increasing sulfuric acid concentrations, gallium extraction increased to over 95%, while germanium extraction reached a peak of ...

THE DEVELOPMENT AND IMPLEMENTATION OF INDUSTRIAL ...

The goals of the gallium recovery project were to: Review the feasibility of gallium removal from the refinery residue prior to sale of the residue for the germanium values, Identify and lab test a commercial process for the recovery of gallium, Pilot test the commercial process, and

Recovery and separation of gallium(III) and germanium(IV ...

In order to selectively separate and fast recover gallium (III) and germanium (IV), 3D hierarchical porous hoya-like α-FeOOH (3D-α-FeOOH) was obtained via a facile one-step synthesis process.

Recovery and separation of gallium(III) and germanium(IV ...

In the second leaching stage with oxalic acid media, the effects of H 2 C 2 O 4 concentration, leaching time, liquid-to-solid (L/S) ratio and temperature on the recovery of gallium and germanium were investigated. More than 96% of gallium and 99% of germanium were leached out using 70 g/L H 2 C 2 O 4 with a L/S ratio of 10 at 90 °C for 2 h.

NIOSHTIC-2 Publications Search - 10011639 - Gallium and ...

To recover gallium and germanium from the leach solutions, the solvent extractants octylphenyl acid phosphate (OPAP) (for gallium) and lix 63-OPAP (for germanium) were identified. These extractants were tested in separate, continuous, solvent- extraction circuits, yielding a gallium recovery of 94 pct and a germanium recovery of more than 90 pct.

(PDF) The Development of Gallium and Germanium Recovery ...

This report details the research and development that culminated in a successful pilot scale gallium and germanium recovery facility. A comprehensive …

Germanium: Current and Novel Recovery Processes | IntechOpen

4. Current and novel recovery processes for germanium. Several processes have been recommended for Ge recovering based on its content, chemical species, and mineral phases that are present in by-products from Zn, Cu, and Pb ores processing and from coal combustion and gasification.

(PDF) The Development of Gallium and Germanium …

This report details the research and development that culminated in a successful pilot scale gallium and germanium recovery facility. A comprehensive …

Recovering in, Ge and Ga from zinc residues | SpringerLink

A novel solvent extraction process has been developed to selectively recover indium, germanium and gallium from the cement residue sulfuric acid leach solutions in a hydrometallurgical zinc plant. The key work was to determine a special organic molecule for gallium and germanium extraction. Continuous countercurrent tests on the mini-pilot plant …

Process for the recovery of gallium and germanium from ...

a method is disclosed for recovering gallium and/or germanium from fly ash which comprises pelletizing the fly ash, treating the pellets in the presence of an oxidizing gas at a temperature of from about 900° c. to just below the fusion temperature of the pellets, treating the pellets in the presence of a reducing gas at the same temperature …

Recovery and separation of gallium(III) and germanium(IV ...

In this research, gallium and germanium were separated and recovered from zinc refinery residues by a two-stage leaching. In the first leaching stage with sulfuric acid media, 92% of zinc and 94% of copper were leached resulting in significant gallium and germanium enrichment up to ca. 300%.

CADMIUM, GALLIUM, GERMANIUM RESOURCES VIRGINIA

note that some of the germanium is associated with quartz and is difficult to recover. In 1986, St. George Mining Corp. estimated the proven reserves to be 180,000 tons of ore con- taining 0.042 percent gallium and 0.115 percent germanium. During 1986, 1650 pounds of …

Gallium and germanium recovery from domestic sources

To recover gallium and germanium from the leach solutions, the solvent extractants octylphenyl acid phosphate (OPAP) (for gallium) and lix 63-OPAP (for germanium) were identified. These extractants were tested in separate, continuous, solvent- extraction circuits, yielding a gallium recovery of 94 pct and a germanium recovery of more than 90 ...

Recovery and separation of gallium(III) and germanium(IV ...

1. Introduction. Gallium and germanium are critical metals that do not occur as separate ores in the nature. Currently, the most significant sources of gallium and germanium are the refining by-products of zinc, copper and aluminum (Harbuck, 1992, Lee et al., 1994, Kul and Topkaya, 2008).Owing to the increasing importance of Ga and Ge in technological …

SBIR Phase I: Gallium and Germanium Recovery from Acidic ...

This should permit germanium and gallium loadings and usable materials lifetimes that are superior to current technologies. The development of more efficient means of extracting these metals will result in the exploitation of germanium and gallium deposits in the United States that cannot be currently developed due to the limited availability ...

Gallium and germanium recovery from domestic sources

To recover gallium and germanium from the leach solutions, the solvent extractants octylphenyl acid phosphate (OPAP) (for gallium) and lix 63-OPAP (for germanium) were identified.