germanium fly extraction

Recovery of germanium from real fly ash leachates by ion …

Germanium recovery from real fly ash (FA) leachates was studied using ion-exchange procedures. The procedure was based on germanium complexation with catechol () in an aqueous solution followed ...

Recovery of germanium from real fly ash leachates by ion …

Germanium form fly ash leachates and catechol forms a complex. Ge- complex can be retained on to conventional anionic resin (215.5 mg of Ge/g of resin. Elution was achieved with acid solutions in an ethanol matrix. ... The possibility of resin reutilization was checked and high germanium extraction yields (97.6–98.3%) were very high after ...

Recovery of Germanium from Aqueous Solutions by Ion-Exchange Extraction

The paper is concerned with the recovery of germanium from dilute aqueous solutions. The method is based on the sorption of the selective complex formed by catechol with germanium onto low-cost anionic resins. Experimental investigations were undertaken using conventional quaternary ammonium macroporous resins: Amberlite IRA-900 and …

Germanium and Gallium Extraction from …

The results revealed that relatively high Ge extraction yields (up to 83 % after 2 h leaching period) may be achieved using a weak acid solution. Gallium yielded up to 70 and 64 % …

Resources and extraction of gallium: A review

Fortunately, the above mentioned pilot plant was able to successfully extract Ga from fly ash, which is a big step forward in the process industrialization. 4.5. Electronics industry waste4.5.1. GaAs new scrap. ... Extraction of gallium and germanium from zinc refinery residues by pressure acid leaching. Hydrometallurgy, 164 (2016), pp. 313-320.

Non-dispersive selective extraction of germanium from fly …

O/A =1/8, mass ratio of complexing agent to germanium 12-16, and at normal temperature,3-5 min.The optimum back extraction conditions are NaOH concentration 30%, O/A=2, and at normal temperature ...

Extraction Behavior and Purification of …

The recovery of germanium from low-grade ores and secondary resources requires the development of new separation and purification techniques. In this work, the solvent extraction (SX) …

Recovery of germanium from real fly ash leachates …

Recovery of germanium from real fly ash leachates by ion-exchange extraction - ScienceDirect. Minerals Engineering. Volume 24, Issue 1, January 2011, …

IGCC fly ash valorisation. Optimisation of Ge and Ga …

Germanium and Ga extraction tests were carried out on Puertollano IGCC fly ash. The whole extraction conditions selected (Table 2) were applied on the historical IGCC FA samples. The results of these extraction tests allowed the selection of the optimal extractant(s) for Ge and/or Ga. Extraction tests with the optimal extractant were ...

Precipitation of Germanium from Coal Fly Ash Leachates

The valorization of coal gasification fly ash is studied by leaching the fly ash with water and a subsequent precipitation of trace amounts of germanium from the leachates. Experimental ...

Ge extraction from gasification fly ash | Request PDF

The process is based on hydrometallurgical operations: firstly a germanium extraction from fly ash by leaching and a consequent Ge separation from the other elements present in the solution by ...

Extraction of germanium(IV) from acid leaching solution with mixtures

Solvent extraction experiments were conducted from acidic solutions containing germanium(IV) and other metal ions, such as Ga 3+, Fe 3+, Zn 2+ and Fe 2+ in hydrometallurgical process of zinc. The purpose of this work was to enhance the efficiency of the extraction and stripping processes and the selectivity of germanium and other …

Recovery of germanium from real fly ash leachates by ion …

Germanium, a scattered metal in nature, is generally extracted from coal fly ash produced by the combustion of germanium-rich lignite in industrial process. It is a direct approach for germanium enrichment from lignite, however facing the challenges of high carbon emission and losing valuable humic acid.

Ion flotation of germanium from fly ash aqueous leachates

Flotation of Germanium from Dilute Solutions. Abstract In laboratory experiments, ion flotation was found effective as a concentration method for germanium from dilute aqueous solutions. Removals over 90% were obtained at neutral pH conditions….

Germanium recovery from gasification fly ash: Evaluation of …

The research on the extraction of germanium with Exploration" process [37]. Furthermore, this precipitation method water from the Puertollano IGCC fly ash [25] revealed that relatively may give a high isolation potential for germanium from the impu- high extraction yields (up to 86%) were obtained using pure water. ... extraction of germanium ...

Germanium and Gallium Extraction from Gasification Fly …

Increasing the extraction temperature to 50, 90 and 150 °C, Ge extraction yields were kept at similar levels, while reducing the content of impurities, the water/fly ash ratio and extraction time.

Germanium: Current and Novel Recovery …

Germanium (Ge) is considered a critical element due to its many industrial applications; Ge is a metalloid used in solar cells, fiber optics, metallurgy, chemotherapy, and polymerization catalysis. The …

Germanium extraction from lignite using gravity separation …

Zhang et al. [18] used HCl and MnO 2 to extract Ge from fly ash obtained via vacuum reduction with a 92 % recovery rate. The direct Ge extraction from lignite using chlorinated distillation is uneconomical because of its dispersed distribution in coal [19]. Thus, an economical pre-enrichment of Ge is crucial before chlorinated distillation.

Co-extraction of germanium and nitrogen-rich humic acid from germanium

The germanium is mainly extracted from fly ash of lignite burn, zinc smelter residues, germanium-bearing waste electrical and electronic equipment, etc [8], [9]. Since germanium used in the world industry largely depends on GRL, the rational development of GRL is an important guarantee for the safe supply of germanium [10], [11], [12].

Ion flotation of germanium from fly ash aqueous leachates

The germanium – together with other metals and metalloids contained in the fly ash generated in the Integrated Gasification in Combined Cycle (IGCC) of Elcogas plant (Puertollano, Spain) – may be extracted by aqueous leaching. Here we report the study of the selective recovery of germanium from aqueous leachate by means of ion flotation, …

Strategies for Recycling of Primary and Secondary …

Arroyo et al. also reported as limestone dosage to be the controlling parameter for germanium extraction yield as low germanium extraction was obtained …

Recovery of a critical metal from electronic wastes: Germanium …

The order of reagent concentration efficiency in term of maximum extraction is 2.5 ≥ 5>7.5 M. This shows that there is a H + and CH 3 COOH − concentration beyond which germanium extraction decreases. Therefore, the best reagent concentration for maximum germanium extraction was maintained to be 2.5 M for other experiments.

Hydrometallurgical Recovery of Germanium from Coal Gasification Fly …

This article is concerned with a simple hydrometallurgical method for the selective recovery of germanium from fly ash (FA) generated in an integrated gasification with combined cycle (IGCC) process. The method is based on the leaching of FA with water and a subsequent concentration and selective separation of germanium by a solvent …

Recovery of germanium from leach solutions of fly ash …

The solvent extraction of germanium and some heavy metals by commercial tri-octyl/decyl amine (Alamine 336), N-methyl-N, N-dioctyl chloride (Aliquat 336) and phosphine oxide (Cyanex 923) has been studied.In each extraction system, germanium was only extracted from a solution containing nickel, cadmium, cobalt, and zinc, which …

Recent advances in the recovery of germanium during the …

Coal fly ash (CFA) Germanium is mainly enriched in long flame coal and lignite with low coalification. ... It comprises four phosphorus oxides mixed in the proportion used to extract germanium at a higher acidity (0.5~8 mol/ L) with the advantages of a low degree of hydrolysis, strong interfacial activity, and low water solubility. ...

Industrial Equipment Design for the Recovery of …

extraction11,12 and sorption onto chelating exchange resins.13,14 The SX method for the recovery of germanium from fly ash is based on the germanium-catechol (C 6O 2H 6) chelate and the subsequent extraction of the complex using tri-n-octylamine ((C 8H 17) 3N) and stripping with alkaline solutions. The equilibrium extraction

Germanium recovery from gasification fly ash: Evaluation …

The research on the extraction of germanium with water from the Puertollano IGCC fly ash [25] revealed that relatively high extraction yields (up to 86%) were obtained using pure water. These promising results conducted research towards the study of enrichment and precipitation methods for Ge recovery, such as ion flotation [16,26], adsorption ...

Hydrometallurgical Recovery of Germanium from …

Extraction, Germanium, Metals, Reaction products, Separation science. Abstract. This article is concerned with a simple hydrometallurgical method for the …

One-Pot Synthesis of GeAs Ultrafine Particles from …

Germanium in coal fly ash can be successfully recycled; simultaneously, GeAs ultrafine particles were prepared. Separation principle and feasibility of this process was discussed. Temperature,...

A sustainable method for germanium, vanadium and lithium extraction

The current research examined the extraction of germanium, vanadium, and lithium from coal fly ash (CFA) using a sequential sodium salt roasting and organic acid leaching process. To this end, three sets of experiments were performed. In all experiments, CFA was roasted with salt at 850 °C and then leached with an organic acid.