Optimization of microwave-assisted manganese leaching from electrolyte manganese residue

Chang, Jun; Srinivasakannan, C.; Sun, Xianxiu; Jia, Fukang

doi:10.1515/gps-2020-0001

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…Table 5 presents the results of the response surface ANOVA. The regression model pvalue < 0.0001 indicates that the model is highly significant; at p > 0.1, the model is not significant [41]. As can be seen from Table 5, factors A, B, C, AB, BC, A 2 , B 2 and C 2 are significant terms of the quadratic model.…”

Section: Response Surface Methods Optimization and Analysis Of Phosph...mentioning

confidence: 95%

Study on Pyrolysis Characteristics of Phosphate Tailings under H2O Atmosphere

Yang,

Zhang,

Nie

et al. 2024

Materials

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The pyrolysis separation of calcium and magnesium from phosphate tailings is an important process due to its high-value resource utilization. In this paper, aiming to address the problems of high energy consumption, a slow decomposition rate and the low activity of decomposition products in the high-temperature pyrolysis of phosphate tailings, the medium-temperature pyrolysis of phosphate tailings under a H2O atmosphere was carried out, and the phase reconstruction and activation of pyrolysis process were discussed. The results showed that compared with N2, air and CO2 atmospheres, the pyrolysis process of phosphate tailings in a H2O atmosphere was changed from two stages to one stage, the starting decomposition temperature was reduced to 500 ℃ and the decomposition time was shortened to 30 min. The order of the influence of each factor on the pyrolysis of phosphate tailings was temperature > H2O pressure > holding time. Under the optimized pyrolysis conditions, the yield of CaMg(CO3)2 decomposition of phosphate tailings into MgO and CaO was 97.3% and 98.1%, respectively, and the reactivity of MgO was 31.6%. The distribution of Ca and Mg elements in the phosphate tailings after pyrolysis showed a negative correlation, and both of them no longer formed associated compounds; Ca mainly existed in the form of Ca(OH)2, Ca5(PO4)3F, CaSiO3 and CaF2, and Mg mainly existed in the form of MgO, MgF2 and Mg(OH)2.

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Section: Response Surface Methods Optimization and Analysis Of Phosph...mentioning

confidence: 95%

Study on Pyrolysis Characteristics of Phosphate Tailings under H2O Atmosphere

Yang,

Zhang,

Nie

et al. 2024

Materials

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“…The total volume of added acids (10 mL) and treatment in a microwave oven at 900 W were set as constant input parameters. Factor levels are given as −1 (low), 0 (middle), and 1 (high) [39]. A total of 15 experiments (Table S2) were performed in this optimization step, and the results were analyzed using the RSM and the desirability function (D).…”

Section: Design Of Experiments For Process Optimizationmentioning

confidence: 99%

Recovery of Rare Earth Elements from Coal Fly and Bottom Ashes by Ultrasonic Roasting Followed by Microwave Leaching

Stojković,

Ristić,

Đolić

et al. 2024

Metals

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Considering the rising demand for rare earth elements (REEs), researchers are looking for new sources for their extraction, thereby fostering economic and environmentally justified processing solutions. Among potential industrial sources, coal fly ash emerges as one of the most promising. The recovery of REEs from coal fly and bottom ashes derived from different thermal power plants was the main focus of this study. A dual-step methodology was conducted on ash samples, which involved an ultrasonic roasting process to disintegrate the silica matrix, followed by a microwave-assisted acid leaching step to extract REEs. The roasting procedure was studied using the Plackett–Burman design, and the Box–Behnken design was subsequently implemented to optimize the leaching procedure. The optimized ultrasonic roasting procedure was set up at 95 °C for 10 min with an ash-to-roasting agent (3M NaOH) ratio of 0.5:1 (m/V). For acid leaching, the optimal conditions were obtained at 174 °C for 30 min with an HCl ÷ HNO3 mixture (1:1 V/V). The standard reference material (NIST 1633c) was used in the conclusive experiments to estimate the average recovery (80%) of REEs. The green aspects of this methodology were evaluated using several metrics (atom economy, E-factor, and energy consumption). The proposed process outperforms high-temperature roasting procedures in terms of greenness; however, the REE recovery rate is lower.

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Recyling manganese-rich electrolytic residues: a review

Wang

Long

et al. 2023

Environ Chem Lett

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Optimization of microwave-assisted manganese leaching from electrolyte manganese residue

Cited by 6 publications

References 25 publications

Study on Pyrolysis Characteristics of Phosphate Tailings under H2O Atmosphere

Study on Pyrolysis Characteristics of Phosphate Tailings under H2O Atmosphere

Recovery of Rare Earth Elements from Coal Fly and Bottom Ashes by Ultrasonic Roasting Followed by Microwave Leaching

Recyling manganese-rich electrolytic residues: a review

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