A novel dissolution‐precipitation method for high‐efficiency separation of oil‐wetted oil sands

Hu, Pengcheng; Chai, Ruimin; Liu, Quanyou; Wang, Junlin; Zhou, Shu‐Feng

doi:10.1002/cjce.23684

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…Therefore, it is very urgent to research the treatment of uranium-containing wastewater. At present, most uranium-containing wastewater is treated by chemical precipitation [12,13], evaporation [14], condensation-flocculation, ion exchange, extraction [15][16][17], membrane permeation, electrochemistry, and adsorption [18][19][20]. Among the above methods, adsorption method is an important research direction for uranium-containing wastewater treatment because of its convenient operation, economy and high efficiency [21].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of zeolite X from waste basalt powder and its efficient adsorption of uranyl ions in solution

Deng

Zhao

et al. 2022

J Radioanal Nucl Chem

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In order to make full use of waste as raw materials to prepare low-cost zeolite, develop green chemical industry and achieve the purpose of treating waste with waste. High-purity zeolite X was prepared by the alkaline fusion hydrothermal method (AFH) using waste basalt powder as raw material, and was used as an adsorbent to investigate the adsorption performance for uranium-containing wastewater. The structure, morphology, specific surface area, chemical composition, chemical bonds, characteristic functional groups and chemical states of surface elements of the samples were characterized by XRD, SEM, BET, EDS, FT-IR and XPS. zeolite X with high crystallinity and rich hydroxyl/carboxyl groups was successfully synthesized by the AFH method, and its specific surface area was as high as 623.4 m 2 •g -1 . When the adsorption time (t) is 720 min, the adsorption temperature (T) is 30 ℃, the initial uranium (VI) concentration is (C0) 35 mg/L, pH is 6.0, and the adsorbent dosage (m) is 5/35 mg/mL, the equilibriu adsorption capacity of zeolite X for uranyl ions is 228.4 mg•g -1 . Thermodynamic results show that the adsorption process of uranyl ions by zeolite X is spontaneous and exothermic. Freundlich isotherms and quasi-second-order models are suitable to describe the adsorption process of uranyl ions by zeolite X. XPS analysis results show that -OH and -COOH play an important role in the adsorption process. At the same time, there is ion exchange between UO2 2+ and zeolite during the adsorption process.

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Section: Introductionmentioning

confidence: 99%

Synthesis of zeolite X from waste basalt powder and its efficient adsorption of uranyl ions in solution

Deng

Zhao

et al. 2022

J Radioanal Nucl Chem

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“…It is of great practical significance to carry out basic research on green bitumen extraction technology. [1,2] Solvent extraction has attracted increasing attention because of its high extraction efficiency and mild processing conditions. [3][4][5][6] The ionic liquid (IL)-assisted solvent extraction with its superior potentials has a rapid development.…”

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confidence: 99%

High‐efficiency separation of oil sands using ChCl‐based deep eutectic solvents

Yuan

Zhao

et al. 2022

Can J Chem Eng

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Deep eutectic solvents (DESs) are a kind of potential lixiviant for extraction processing. Unlike conventional ionic liquids (ILs), DESs are relatively cheap and environmentally friendly. Herein, three different ChCl-based DESs, namely, choline chloride/urea, choline chloride/ethylene glycol, as well as choline chloride/propandioic acid, were synthesized and used to enhance bitumen recovery from oil sand by petroleum ether extraction. The results showed a multiphase system formed after mixing the components at ~25 C, consisting of sands and clays, a DES layer, and a petroleum ether layer containing the bitumen. These DESs were immiscible with bitumen or petroleum ether.Coupled with a density difference, a clear phase separation was presented between the bitumen-petroleum ether mixture and DES. The DES functioned as a separating agent, keeping the petroleum ether-bitumen mixture and spent sand apart from each other. The results showed that the bitumen recovery was increased by ~12% compared with that without the DESs. We deduced that the enhancement in the separation may result from the reduction of adhesion between bitumen and sand by the DESs. The ChCl-based DESs and petroleum ether could be readily recycled to reduce industrial costs. After 10 cycles, the bitumen recovery remained above 86%.

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Synthesis of Zeolite X From Waste Basalt Powder And Its Efficient Adsorption of Uranyl Ions In Solution

Yin

Ouyang

et al. 2021

Preprint

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In order to make full use of waste as raw materials to prepare low-cost zeolite, develop green chemical industry and achieve the purpose of treating waste with waste. High-purity zeolite X was prepared by the alkaline fusion hydrothermal method (AFH) using waste basalt powder as raw material, and was used as an adsorbent to investigate the adsorption performance for uranium-containing wastewater. The structure, morphology, specific surface area, chemical composition, chemical bonds, characteristic functional groups and chemical states of surface elements of the samples were characterized by XRD, SEM, BET, EDS, FT-IR and XPS. zeolite X with high crystallinity and rich hydroxyl/carboxyl groups was successfully synthesized by the AFH method, and its specific surface area was as high as 623.4 m2·g-1. When the adsorption time (t) is 720 min, the adsorption temperature (T) is 30 ℃, the initial uranium (VI) concentration is (C0) 35 mg/L, pH is 6.0, and the adsorbent dosage (m) is 5/35 mg/mL, the equilibriu adsorption capacity of zeolite X for uranyl ions is 228.4 mg·g-1. Thermodynamic results show that the adsorption process of uranyl ions by zeolite X is spontaneous and exothermic. Freundlich isotherms and quasi-second-order models are suitable to describe the adsorption process of uranyl ions by zeolite X. XPS analysis results show that -OH and -COOH play an important role in the adsorption process. At the same time, there is ion exchange between UO22+ and zeolite during the adsorption process.

show abstract

A novel dissolution‐precipitation method for high‐efficiency separation of oil‐wetted oil sands

Cited by 3 publications

References 27 publications

Synthesis of zeolite X from waste basalt powder and its efficient adsorption of uranyl ions in solution

Synthesis of zeolite X from waste basalt powder and its efficient adsorption of uranyl ions in solution

High‐efficiency separation of oil sands using ChCl‐based deep eutectic solvents

Synthesis of Zeolite X From Waste Basalt Powder And Its Efficient Adsorption of Uranyl Ions In Solution

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