method for extracting gallium from fly ash

A zero-emission collaborative treatment method for brown corundum fly

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, …

Metals | Free Full-Text | Investigation on the Effect of …

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 …

Recovery of Gallium from sulfuric acid leach liquor of coal fly ash …

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 ...

A method for synergistic extraction of aluminum, silicon, …

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 …

METHOD FOR EXTRACTING GALLIUM FROM FLY ASH

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 …

Process for the recovery of gallium and germanium from coal fly ash

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, …

METHOD FOR EXTRACTING GALLIUM FROM FLY ASH

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 …

Research on the Source and Recovery Methods of Gallium

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 …

METHOD FOR EXTRACTING GALLIUM FROM FLY ASH

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 ...

A sustainable method for germanium, vanadium and lithium extraction …

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

Resources and extraction of gallium: A review

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 …

Method for extracting gallium from fly ash

The invention discloses a method for extracting gallium metal from fly ash of a fluidized bed. The method comprises the following steps of: crushing the fly ash, performing wet magnetic separation to remove iron, and reacting the fly ash with hydrochloric acid to obtain hydrochloric acid extract; b) introducing the hydrochloric acid extract into a …

Leaching of Gallium from Coal Fly Ash, Alumina and …

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 ...

Method for extracting gallium from fly ash based on resin method

The invention provides a method for extracting gallium from fly ash based on a resin method, which takes crude liquid obtained after the fly ash is subjected to acid leaching treatment as a raw material. Compared with the prior art, the method is based on a resin method, the dosage of reagents such as alkali liquor and the like is obviously reduced, …

DE112011101460B4

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 …

Method for extraction of iron, aluminum and titanium from coal ash

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 …

Investigation on the Effect of Roasting and Leaching …

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 ...

Two methods for extracting gallium from fly ash

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 …

Method for secondarily extracting gallium and germanium from fly ash

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 …

Method for extracting gallium from fly ash

Exploring a promising technology for the extraction …

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 …

The Synergistic Extraction Kinetics of Aluminum and Silicon …

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 …

Germanium and Gallium Extraction from …

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 …

A stepwise separation process for selective recovery …

Abstract. 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 …

Hydrometallurgical Recovery of Germanium from Coal Gasification Fly Ash

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 …

Germanium and Gallium Extraction from Gasification Fly Ash

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 …

Exploring a promising technology for the extraction …

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 …

Method for extracting gallium from fly ash

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 …

Recovery of gallium and vanadium from gasification fly ash

The optimal Ga extraction conditions was determined as 25 °C, NaOH 0.7–1 M, NaOH/FA ratio of 5 L/kg and 6 h, attaining Ga extraction yields of 60–86%, equivalent to 197–275 mg of Ga/kg of fly ash. Re-circulation of leachates increased initial Ga concentrations (25–38 mg/L) to 188–215 mg/L, while reducing both content of impurities ...

Metals | Free Full-Text | Investigation on the Effect of

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 …