Recovery of Gallium from Corundum Flue Dust by Two-Stage Alkali Leaching, Carbonation, Acid Leaching and Solvent Extraction Process

Kang, Wen; Jiang, Feng; Zhou, Xiangyang; Sun, Ze

doi:10.3390/met8070545

Cited by 16 publications

(10 citation statements)

References 18 publications

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“…This makes it difficult to filter the leaching slurry. Meanwhile, the loss of gallium increased due to the adsorption by silica gel [14]. A previous study noted that some rare elements were leached in 3 mol/L acid [13].…”

Section: Effect Of Acid Leaching Time and Hno 3 Concentrationmentioning

confidence: 94%

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Investigation on the Effect of Roasting and Leaching Parameters on Recovery of Gallium from Solid Waste Coal Fly Ash

Huang

Wang

Zhou

et al. 2019

Metals

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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 (nitric acid) leaching process was demonstrated. The effect of roasting temperature, roasting time, the NaF-CFA mass ratio, acid leaching temperature, acid leaching time, and acid concentration were investigated. The results revealed that under optimal conditions (roasting temperature of 800 °C, roasting time of 10 min, acid leaching in 2 mol/L HNO3 for 1 h, and the NaF-CFA mass ratio of 0.75:1), 94% of gallium was extracted. Compared to previous studies, the process is a cost-effective method which can greatly shorten reaction time. It can reduce environmental pollution as it requires fewer acid reagents with low concentration and additives. It is expected to provide a method for the extraction of gallium from CFA.

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Section: Effect Of Acid Leaching Time and Hno 3 Concentrationmentioning

confidence: 94%

“…Over the past few decades extraction of gallium from coal and CFA has usually followed three main paths: Direct acid leaching [9,10] or alkali roasting followed by acid leaching [11][12][13] or alkali leaching [14]. However, these methods have a number of disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Roasting and Leaching Parameters on Recovery of Gallium from Solid Waste Coal Fly Ash

Huang

Wang

Zhou

et al. 2019

Metals

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“…Apart from primary processing, the process of alkaline leaching and precipitation through CO 2 was studied for gallium recovery from industrial by-products. Wen et al [19] investigated extraction from corundum flue dust and found that increasing the alkali concentration and temperature facilitated gallium leaching. In this work, the concentration of NaOH was varied from 35 to 55 wt.% and maximum temperature was set to 90 • C. Depending on alkali concentration, the liquid to solid ratio had a considerable influence on the leaching efficiency of gallium.…”

Section: Primary Gallium Extraction From Bayer Liquormentioning

confidence: 99%

Recovery of Gallium from Smartphones—Part II: Oxidative Alkaline Pressure Leaching of Gallium from Pyrolysis Residue

Flerus

Friedrich

2020

Metals

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In this article, we examine the selective hydrometallurgical extraction of gallium from pyrolyzed smartphones. Gallium-enriched pyrolysis residue originating from pyrolyzed smartphones was leached using NaOH and gaseous oxygen at elevated temperatures and pressures. The high content of organic carbon in the material strongly influenced the leaching performance. Oxygen, which is indispensable for the dissolution of gallium, also oxidized the organic carbon in the feed so that CO2 was released, which had a neutralizing effect on the alkaline solution. As a result, the CO2 formation complicated the accurate process control as the leaching temperature increased. The highest gallium yield of 82% was obtained at 180 °C, 5 g/L NaOH and 5 bar oxygen pressure. Decreased temperatures, NaOH concentrations and oxygen pressures resulted in lower leaching yields but with a higher selectivity for Ga. Temperatures higher than 180 °C resulted in extensive carbon oxidation, NaOH consumption and the coextraction of Cu and Ag. We propose that those conditions also facilitated the formation of water-soluble organic compounds, which would also influence the metal dissolution.

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“…However, the high causticity of the hydrofluoric acid and the treatment of fluorine-containing wastewater must be taken into account in this process. A two-stage alkaline leaching, carbonation, acid leaching, and solvent extraction process was proposed in another paper to recover gallium from the CFD collected from a plant in Shanxi Province, China [32], and the overall gallium recovery was acceptable. However, the two-step alkali leaching procedure could be simplified and improved.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Gallium from the Brown Corundum Dust with a One-Step Alkaline Leaching Process

Zhang,

Gao,

Hui

et al. 2023

Separations

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Brown corundum dust, which is created during the manufacturing of brown corundum using bauxite as the raw material, is a vital carrier of gallium. To ascertain the presence of the contained gallium, the brown corundum dust was measured and characterized (XRF, XRD, ICP-OES, EPMA, SEM-EDS, etc.). Gallium was extracted from the brown corundum dust using a one-step alkali leaching process, and thermodynamic calculations were utilized to assess the viability of the leaching reactions. The effects of leaching parameters (NaOH solution concentration, leaching time, leaching temperature, solid–liquid ratio and stirring speed) on the recovery of gallium during the leaching process were investigated. A gallium recovery of 96.83% was discovered to be possible with the following parameters: 200 g/L of NaOH, 363 K for the leaching temperature, 60 min for the leaching time, 1:10 g/mL for the solid–liquid ratio, and 850 rpm for the stirring rate. Gallium extraction was negatively impacted by raising the leaching temperature above 363 K and the concentration of NaOH solution above 200 g/L due to the accelerated side reactions between Na+, K+, SiO44− and AlO2−, which led to the precipitation of aluminosilicates that absorbed gallium from the solution. The influences of leaching parameters such as the temperature, NaOH solution concentration, and solid–liquid ratio on the leaching kinetics were examined. It was demonstrated that the leaching process followed the unreacted shrinking core model, that the interfacial diffusion associated with the contacting surface area served as the controlling step, and that the apparent activation energy was 42.83 kJ/mol. It turned out that the final kinetic equation was 1/(1 − α)1/3 − 1 = 4.34 × 104 × (CNaOH)2.12 (L/S)0.43exp[−42835/(RT)] t.

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Recovery of Gallium from Corundum Flue Dust by Two-Stage Alkali Leaching, Carbonation, Acid Leaching and Solvent Extraction Process

Cited by 16 publications

References 18 publications

Investigation on the Effect of Roasting and Leaching Parameters on Recovery of Gallium from Solid Waste Coal Fly Ash

Investigation on the Effect of Roasting and Leaching Parameters on Recovery of Gallium from Solid Waste Coal Fly Ash

Recovery of Gallium from Smartphones—Part II: Oxidative Alkaline Pressure Leaching of Gallium from Pyrolysis Residue

Extraction of Gallium from the Brown Corundum Dust with a One-Step Alkaline Leaching Process

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