Energy-efficient leaching process for preparation of aluminum sulfate and synergistic extraction of Li and Ga from circulating fluidized bed fly ash

Li, Jian; Gao, Jian-ming; Guo, Yanxia; Cheng, Fangqin

doi:10.1080/15567036.2022.2077476

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…Saline soil has high capacity, low porosity, and a dense structure, which seriously impedes the penetration of plant roots in the soil [63]. In this study, the application of amendment materials can significantly change the three-phase structure of the soil: the proportion of the solid phase is reduced, whereas that of the liquid and gas phases changes to different degrees.…”

Section: Discussionmentioning

confidence: 89%

Improving Physical and Chemical Properties of Saline Soils with Fly Ash Saline and Alkaline Amendment Materials

An,

Han,

et al. 2024

Sustainability

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Studies have demonstrated that the physicochemical properties of saline soils can be improved, and crop growth can be promoted by fly ash saline and alkaline soil amendment materials. Herein, the effects of fly ash saline and alkaline soil amendment materials on the physical and chemical properties of saline soil and growth conditions of Arrhenatherum elatius at room temperature were evaluated. Meanwhile, planting experiments of Zea mays L. were conducted in the demonstration field of saline–alkaline land amendment in Yinchuan, Ningxia. The results showed that the application of amendment materials significantly (p < 0.05) improved saline soil’s physical and chemical properties. The saline soil pH decreased from an average of 10.51 to 8.89; the Na+ content decreased from an average of 2.93 g·kg−1 to 0.7 g·kg−1 after 25 days of action. In addition, the soil bulk density decreased from an average of 1.49 g·cm−3 to 1.36 g·cm−3, and the total porosity increased by 15.60%. Soil available phosphorus and available potassium content also increased significantly, with mean values increasing from 6.74 mg·kg−1 and 173 mg·kg−1 to 58.30 mg·kg−1 and 330.76 mg·kg−1, respectively. In addition, the plant height and stem thickness of Arrhenatherum elatius increased from an average of 11.76 cm, 1.28 mm to 21.72 cm, 1.59 mm with the application of 2.5 wt% amendment material. The plant height and stem thickness of Zea mays L. increased from mean values of 210 cm and 21.94 mm to 315.7 cm and 26.75 mm, respectively, when 0.07 t·hm−2 of amendment material was applied in the field. Overall, it was concluded that applying fly ash saline and alkaline soil amendment materials improves the physicochemical properties of saline soils, reducing saline stress and promoting the growth of Arrhenatherum elatius and Zea mays L.

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Section: Discussionmentioning

confidence: 89%

Improving Physical and Chemical Properties of Saline Soils with Fly Ash Saline and Alkaline Amendment Materials

An,

Han,

et al. 2024

Sustainability

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“…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%

“… 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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“…About 90% of alumina could be leached from coal fly ash by the sulfuric acid pressure leaching process with the leaching temperature of 250 °C and pressure of 4.0 MPa. 16 The high investment cost as well as harsh reaction conditions limited the industrial application. How to realize the efficient separation and comprehensive utilization of valuable metals from coal fly ash in mild conditions is of great significance.…”

Section: Introductionmentioning

confidence: 99%

Novel process for high value utilization of high-alumina fly ash: valuable metals recovery and mesoporous silica in situ preparation

Gao,

Yan,

et al. 2024

RSC Adv.

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Energy-efficient leaching process for preparation of aluminum sulfate and synergistic extraction of Li and Ga from circulating fluidized bed fly ash

Cited by 10 publications

References 21 publications

Improving Physical and Chemical Properties of Saline Soils with Fly Ash Saline and Alkaline Amendment Materials

Improving Physical and Chemical Properties of Saline Soils with Fly Ash Saline and Alkaline Amendment Materials

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

Novel process for high value utilization of high-alumina fly ash: valuable metals recovery and mesoporous silica in situ preparation

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