A method for extracting gallium from circulating fluidized bed fly ash from coal combustion, comprising the following steps: a) grinding the fly ash to a particle size which passes through a sieve with a sieve opening size of 149 μm (size of 100 mesh or smaller) Removing iron by wet magnetic deposition such that the iron oxide content in the fly ash …

Abstract. The Puertollano Integrated Coal Gasification Combined Cycle (IGCC) Power Plant (Spain) fly ash is characterized by a relatively high content of Ga and V, which occurs mainly as Ga2O3 and ...

Towards the prevailing issues in the current process of extracting alumina from fly ash, a novel synergistic extraction of aluminum and silicon from high-alumina fly ash was proposed, which features carbochlorination with chlorine and carbon as raw materials. In this paper, the carbochlorination kinetics of aluminum and silicon was …

Disclosed is a method for extracting gallium from fly ash, which comprises the following steps: crushing the fly ash and removing Fe by magnetic separation; then dissolving it by using hydrochloric acid to obtain hydrochloric acid leachate; adsorbing gallium contained in the hydrochloric acid leachate with macro-porous …

Environmental Science, Chemistry. 2016. ABSTRACT This study is mainly focused on the direct adsorption of low concentration gallium from the feed solution in pre-desilication soda-lime sintering process from coal fly ash. The adsorption…. Expand.

EP2565283A1 EP11774393A EP11774393A EP2565283A1 EP 2565283 A1 EP2565283 A1 EP 2565283A1 EP 11774393 A EP11774393 A EP 11774393A EP 11774393 A EP11774393 A EP ...

A clean method for gallium recovery and the coproduction of silica-potassium compound fertilizer and zeolite F from brown corundum fly ash ... A novel method was proposed for extracting Ga and the coproduction of SPCF and zeolite F from BCFA. During the hydrothermal leaching process, BCFA underwent dissolution and …

The invention discloses a recovery method for extracting gallium from aluminum oxide coarse-fine liquid by using acid-process fly ashes. The method comprises the following steps: a separating step, namely carrying out ion adsorption on aluminum oxide coarse-fine liquid which is extracted by an acid process through CL-TBP extraction resin to obtain …

Disclosed is a method for extracting gallium from fly ash, which comprises the following steps: crushing the fly ash and removing Fe by magnetic separation; then dissolving it by using hydrochloride acid to obtain hydrochloric acid leachate; adsorbing gallium contained in the hydrochloric acid leachate with macro-porous cationic resin, followed by eluting to …

Coal fly ash (CFA) provides important resources of gallium, which is regarded as an irreplaceable material in many technologies. A prospective roasting reagent assisted acid leaching process was proposed for the purpose of extracting gallium. The extraction efficiency of gallium by NaF (sodium fluoride) roasting followed by HNO3 …

A technology of fly ash and combined method, applied in the direction of silicate, improvement of process efficiency, alkaline earth metal silicate, etc., can solve the problems of long treatment process, failure to fully utilize lithium resources, high energy consumption, etc., and achieve cost reduction Low, mild reaction conditions, high …

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 …

Abstract. This patent describes a method for the recovery of iron, aluminum, and titanium from coal ash. This method consists of: (a) magnetically extracting magnetite from the ash, (b) leaching the ash with a solution of a mineral acid selected from the group consisting of sulfuric, hydrochloric, and nitric acids, (c) precipitating and removing …

Based on the Ge and Ga speciation in the Puertollano IGCC fly ash, a sequential extraction procedure based on a starting water leaching step for the extraction of Ge …

ABSTRACT The coal fly ash (CFA) in the present study contains a high content of gallium, which is categorized as a strategic metal. Gallium extraction from …

Abstract. Coal fly ash (CFA) provides important resources of gallium, which is regarded as an irreplaceable material in many technologies. A prospective roasting reagent assisted acid leaching …

Disclosed is a method for extracting gallium from fly ash, which comprises the following steps: crushing the fly ash and removing Fe by magnetic separation; then dissolving it by using hydrochloride acid to obtain hydrochloric acid leachate; adsorbing gallium contained in the hydrochloric acid leachate with macro-porous cationic resin, followed by eluting to …

Different extraction methods are used to recover gallium from different sources, such as zinc ore, bauxite, fly coal ash, and other minerals. This paper briefly introduces the …

Disclosed is a method for extracting gallium from fly ash, which comprises the following steps: crushing the fly ash and removing Fe by magnetic separation; then dissolving it by using hydrochloride acid (2) to obtain hydrochloric acid leachate; adsorbing gallium in the hydrochloric acid leachate with macro-porous cationic resin, followed by eluting to obtain …

The interest in gallium (Ga) recovery from coal fly ash has been driven by its rapidly growing demand for manufacturing and its extraction can facilitate the effective use of coal fly ash, which ...

Furthermore, as solid extraction material, the imprinted sorbent was applied successfully for extraction of Ga(III) ion from fly ash lixivium followed by FAAS detection. Some methods have been used for the determination of gallium summarized in Table 6. Each method has its advantages and limitations.

Disclosed is a method for extracting gallium from fly ash, which comprises the following steps: crushing the fly ash and removing Fe by magnetic separation, then dissolving it by using hydrochloric acid (2) to obtain hydrochloric acid leachate; adsorbing gallium in the hydrochloric acid leachate with macroporous cation resin, followed by eluting to obtain …

Method for extracting gallium from fly ash Download PDF Info ... Prior art keywords gallium fly ash eluent magnetic eluting Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

the fly ash obtained from some places contains a large amount of gallium which even overpasses the gallium level of mineral deposit. It has been verified by researches that the gallium content in the fly ash is usually 12-230 ⁇ g/g. As compared with the gallium contents of other resources, the fly ash deserves to be extracted for metal gallium as a …

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, …

DOI: 10.1016/j.fuel.2021.122844 Corpus ID: 245243985; A sustainable method for germanium, vanadium and lithium extraction from coal fly ash: Sodium salts roasting and organic acids leaching

A method for extracting gallium from circulating fluidized bed fly ash from coal combustion, comprising the steps of: a) grinding the fly ash to a particle size which …

The comparison of Ge extraction yields obtained for 13 IGCC fly ash samples in the same extraction conditions (25oC, water/fly ash ratio of 10 L/kg and 24 h leaching period) revealed that generally Ge yielded a lower extraction percentage (40-50 %) at high limestone dosages (4 %) than reached (53-91 %) when those are reduced down to 2 …

1. Introduction. In recent years, with the rapid development of semiconductors, new energy and other fields, the market demand for gallium has increased rapidly [1], [2], [3].However, the distribution of gallium in nature is highly fragmented, making it difficult to find independent deposits suitable for extraction [4].Currently, …

A method is described of recovering gallium and germanium from fly ash which comprises: (a) pelletizing the fly ash; (b) heating the pellets in an oxidizing atmosphere at a temperature of from about 900/sup 0/C to just below the fusion temperature of the pellets, the temperature being high enough to remove trace elements volatile in an oxidizing …

In recent years, research into the recovery of gallium from various sources has been carried out, including Bayer liquor (Zhao et al., 2012), bauxite residue (Lu et al., 2018), coal fly ash (Zhao ...

After extracting gallium from the HCl leachate using N235 as extracting agent, 1% NaOH solution was used to strip gallium from the organic phase. The extraction and stripping efficiency of gallium ...

A number of technologies, e.g. acid and alkali methods or salt activation method, have been developed to extract Ga and Al from the Jungar high-Al 2 O 3 fly ashes (Guo et al. 2013;Feng et al. 2014 ...

Yu Gu. The coal fly ash (CFA) in the present study contains a high content of gallium, which is categorized as a strategic metal. Gallium extraction from CFA is an …

IGCC fly ash samples in the same extraction conditions (25 o C, water/fly ash ratio of 10 L/kg and 24 h leaching period) revealed that generally Ge yielded a lower extraction percentage (40 -50 %) at high limestone dos ages (4 %) than reached (53 -91 %) when those are reduced down to 2 % 1,11. O ther operational conditions apart from limestone

Disclosed is a method for extracting gallium from fly ash, which comprises the following steps: crushing the fly ash and removing Fe by magnetic separation; then dissolving …

The invention relates to a method for secondarily extracting gallium and germanium from fly ash, which is characterized in that lignite with high quality the heating value of which is larger than 20300kj/kg and fly ash are mixed according to a mass ratio of 0.3 to 0.5 : 1 and are cracked to granularity below 40 meshes; a mixture material the …

the precious metal from coal fly ash. 8,9. Zhao et. al. 7. reported sulfuric acid leaching of Ga from coal fly ash for the subsequent sequential recovery of Ga using P507 and Cyanex 272 ...

In addition to the acid leaching process, the sodium hydroxide extraction method was also evaluated for Ga recovery from fly ash by Oriol et al. (2007). Eight fly ash samples were collected for Ga extraction tests, in which the Ga content ranged …