Ge extraction from gasification fly ash
Water-soluble germanium species (GeS 2, GeS and hexagonal-GeO 2) are generated during coal gasification and retained in fly ash.This fact together with the high market value of this element and the relatively high contents in the fly ashes of the Puertollano Integrated Gasification in Combined Cycle (IGCC) plant directed our …
اقرأ أكثر
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 …
اقرأ أكثر
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 ...
اقرأ أكثر
[PDF] Recovery of germanium from leach solutions of fly …
DOI: 10.1016/J.HYDROMET.2017.11.006 Corpus ID: 104228627; Recovery of germanium from leach solutions of fly ash using solvent extraction with various extractants @article{Haghighi2018RecoveryOG, title={Recovery of germanium from leach solutions of fly ash using solvent extraction with various extractants}, author={Hossein Haghighi and …
اقرأ أكثر
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 …
اقرأ أكثر
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.
اقرأ أكثر
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].
اقرأ أكثر
Germanium and Gallium Extraction from Gasification Fly …
Germanium and gallium occur as water soluble Ge (hexagonal-GeO2 and GeS2) and Ga oxide species in relatively high contents in the Puertollano Integrated Gasification with Combined Cycle (IGCC) fly ash. Both the speciation and contents of Ge and Ga in this cogasification (50:50 coal/pet-coke) fly ash, allowed starting research for developing …
اقرأ أكثر
Recovery of germanium from leach solutions of fly ash …
During the germanium extraction with bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex 301, HR), a significant increase in the germanium extraction is due to the formation of a cationic ...
اقرأ أكثر
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 ...
اقرأ أكثر
(PDF) Recovery of germanium from leach solutions of fly …
Under a comparable Cyanex 923 condition, the germanium extraction efficiency by the aforementioned extractants was in the order Aliquat Fly ashes 336 > Alamine 336 > Cyanex 923. The slope analysis method showed that 2 moles of Alamine 336 and Aliquat 336, as well as 4 moles of Cyanex 923, participated in the extraction of germanium.
اقرأ أكثر
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 ...
اقرأ أكثر
Recovery of Germanium from Aqueous Solutions by Ion-Exchange Extraction
Recovery of germanium from leach solutions of fly ash using solvent extraction with various extractants Hossein Kamran Haghighi 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.
اقرأ أكثر
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.
اقرأ أكثر
Hydrometallurgical Recovery of Germanium from Coal Gasification Fly …
In this article, a hydrometallurgical method for the selective recovery of germanium from fly ash (FA) has been tested at pilot plant scale. The pilot plant flowsheet comprised a first stage of water leaching of FA, and a subsequent selective recovery of the germanium from the leachate by solvent extraction method. The solvent extraction method was based …
اقرأ أكثر
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
اقرأ أكثر
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.
اقرأ أكثر
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 ...
اقرأ أكثر
Germanium: A review of its US demand, uses, resources
The main sources of germanium are zinc refinery residues and fly ash, and thus its production increase depends on the motivation of zinc refineries and coal power plants to engage in the germanium market [8]. ... Ammonoxidation of lignite was performed at the condition of 80 °C for 3 h, then the single extraction rate of germanium was …
اقرأ أكثر
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 …
اقرأ أكثر
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.
اقرأ أكثر
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) …
اقرأ أكثر
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 ...
اقرأ أكثر
Review on resources and recycling of germanium, …
As discussed in Section 2.1, byproducts of zinc metallurgy, fly ash of lignite, and optical fiber could be used as sources for germanium recovery; germanium feed …
اقرأ أكثر
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 …
اقرأ أكثر
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,...
اقرأ أكثر
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.
اقرأ أكثر
Co-extraction of germanium and nitrogen-rich humic acid from germanium
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.
اقرأ أكثر
Hydrometallurgical Recovery of Germanium from …
Extraction, Germanium, Metals, Reaction products, Separation science. Abstract. This article is concerned with a simple hydrometallurgical method for the …
اقرأ أكثر
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 ...
اقرأ أكثر