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

Huang, Jing; Wang, Yingbin; Zhou, Guanxuan; Gu, Yu

doi:10.3390/met9121251

Cited by 19 publications

(6 citation statements)

References 16 publications

(25 reference statements)

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“…The fly ash roasting-acid leaching method has the advantages of a good activation effect and various leaching agents (Huang and Zhang, 2021; Ruan and Ward, 2002). Most of the existing studies used high-temperature roasting and activation of fly ash using single additives such as calcium or sodium salts to extract lithium from fly ash (Huang et al, 2019; Wang et al, 2017). However, in previous studies, the use of mixed additives to recover lithium from fly ash and the mineral conversion process during roasting have been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Lithium activation pretreatment mechanism and leaching process from coal fly ash

Li,

Man,

Cheng

et al. 2024

Energy Exploration & Exploitation

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As a result of the coal combustion process, high lithium enrichment in fly ash has been observed in some areas of China, which is considered to be a potential unconventional lithium resource. At present, most of the studies on lithium in fly ash focus on the leaching process, while there are fewer studies on the activation mechanism of roasting. In view of the above problems, the roasting activation mechanism of fly ash in the Pingshuo mining area (northern China) is investigated, and the leaching process of lithium is optimized. The activation pretreatment that destroys an inert composition of fly ash is necessary. In this study, fly ash and a mixed roasting agent (Na2CO3 and K2CO3 mass ratio of 3:1) were mixed at a mass ratio of 2:1 under 950 °C for 2 h. The results showed that the leaching rate of lithium increased by 70%. Direct acid leaching experiments show that 90% lithium in fly ash is related to insoluble aluminosilicate minerals. The mineralogical analysis of the calcined product shows that the stable aluminosilicate minerals in fly ash disappear and form nepheline KNa3(AlSiO4)3 which is soluble in acid, and the percentage of nepheline in the roasted product controls the leaching rate of lithium. The kinetic analysis of the acid leaching process of the roasting product shows that the lithium leaching process is mainly controlled by chemical reactions. Under the optimal leaching conditions, the leaching rate of lithium is 87.41%.

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Section: Introductionmentioning

confidence: 99%

Lithium activation pretreatment mechanism and leaching process from coal fly ash

Li,

Man,

Cheng

et al. 2024

Energy Exploration & Exploitation

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show abstract

“…In the coal of Pingshuo, the contents of Li and Ga in the inorganic components were significantly higher than those in the organic components, and the main contents of Li and Ga were in the silicates of coal samples . According to the occurrence mode of Li and Ga in coal and its byproducts, the main methods for extracting Li and Ga are the: roasting method and acid–base leaching method. − However, these methods pose problems, such as high consumption of acid/alkali and low metal recovery. , Therefore, it is necessary to preseparate the noncarrier minerals before roasting and acid leaching to reduce the economic cost of later extraction.…”

Section: Introductionmentioning

confidence: 99%

“… 21 According to the occurrence mode of Li and Ga in coal and its byproducts, the main methods for extracting Li and Ga are the: roasting method and acid–base leaching method. 22 − 24 However, these methods pose problems, such as high consumption of acid/alkali and low metal recovery. 25 , 26 Therefore, it is necessary to preseparate the noncarrier minerals before roasting and acid leaching to reduce the economic cost of later extraction.…”

Section: Introductionmentioning

confidence: 99%

Separation and Recovery of Valuable Carbon Components and Li/Ga Metals in Coal Gangue by Using a Flotation Flowsheet

Fang,

Xia,

et al. 2024

ACS Omega

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Coal gangue (CG), an industrial solid waste with high contents of Li and Ga, has attracted the attention of researchers. However, the utilization of CG remains an economic challenge. Pre-enrichment of Li and Ga by flotation was carried out with a view to improving the comprehensive utilization of CG. Mineral composition, time-of-flight secondary ion mass spectrometry (TOF-SIMS), and elemental composition were used to investigate the embeddedness of each mineral and the mode of elemental occurrence in the CG. The results showed that the main mineral compositions of the CG were kaolinite, quartz, and pyrite. Li and Ga were mainly associated with kaolinite and other clay minerals. Li and Ga had a high correlation with Al 2 O 3 and SiO 2 , while Li and Ga were highly correlated with SiO 2 /Al 2 O 3 , indicating that Li and Ga may be associated with one or more high-alumina minerals. In addition, flotation tests proved that synergistic sorting of ash impurities and valuable components from the CG was a cost-effective method. The ash content of the final product was increased by 3% under the process of prediscarding concentrate− dissociation−secondary flotation, and the contents of Li and Ga in the final product were also slightly enriched, and the recovery rate of the carrier minerals of Li and Ga can reach 66.1%.

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“…In the aluminum smelting process, sodium carbonate improves the performance of the fluxing agent [18]. Sodium fluoride, sodium chloride, and sodium carbonate can be used as roasting agents in the processes of extracting valuable materials from primary and secondary sources [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Green recovery of NaF-Na2CO3-NaCl ternary fluxing agent from aluminum dross

Mahinroosta,

Allahverdi

2024

Charact. Appl. Nanomater.

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The present study deliberates the recovery of sodium fluoride (NaF)-natrite (Na2CO3)-sodium chloride (NaCl) ternary fluxing agent from hazardous aluminum dross waste using three types of heating methods, including direct heating on a hotplate, heating by a drying oven, and microwave heating. Deionized water was used as a green solvent for the recovery experiments. Investigating the effects of time and temperature on recovery percentage showed that a recovery percentage of around 96.5% can be achieved under time and temperature of 90 min and 95 ℃, respectively. The recovered fluxing agent salt was characterized by XRD, FTIR spectroscopy, FESEM, and energy dispersive X-ray spectroscopy (EDS) elemental analysis. Rietveld fitting analysis of phases detected in the XRD patterns showed that the recovered fluxing agent contained 74–81 wt.% NaF, 8–11 wt.% NaCl, and 11–14.7 wt.% Na2CO3. The FESEM micrographs revealed that the retrieved salts were in nano scale. The recovered fluxing agent showed different morphologies including needle-like, round shape, and a mixture of both, corresponding to microwave, drying oven, and hotplate heating methods, respectively. The nano-needles exhibited diameter of the tip and base in the range of 39–60 nm and 50–103 nm, respectively.

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

Cited by 19 publications

References 16 publications

Lithium activation pretreatment mechanism and leaching process from coal fly ash

Lithium activation pretreatment mechanism and leaching process from coal fly ash

Separation and Recovery of Valuable Carbon Components and Li/Ga Metals in Coal Gangue by Using a Flotation Flowsheet

Green recovery of NaF-Na2CO3-NaCl ternary fluxing agent from aluminum dross

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