One-step natural pyrite-assisted mechanochemical detoxification of Cr(VI) in soda ash Chromite Ore Processing Residue: Effectiveness, mechanisms, and life cycle analysis

Tian, Hong; Wang, Lanbin; Du, Yunhui; Sun, Yan; Wu, Fan; Ye, Hengpeng; Chen, Shaohua; Guo, Li; Zhang, Tian C.

doi:10.1016/j.jclepro.2022.134958

Cited by 4 publications

(4 citation statements)

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“…These results indicated that particle agglomeration occurred under the action of van der Waals forces . The particles began to attach and aggregate, and the size increased due to the local plastic deformation that occurred in the contact zone of adjacent particles inside the mineral particles …”

Section: Resultsmentioning

confidence: 99%

“…45 The particles began to attach and aggregate, and the size increased due to the local plastic deformation that occurred in the contact zone of adjacent particles inside the mineral particles. 30 However, when the ball milling speed reached 500 rpm, D 50 decreased to 3.52 μm, and the specific surface area increased to 9.12 m 2 /g. Simultaneously, this sample is the most concentrated in size distribution, with 90% particles smaller than 5.18 μm (Figure S3).…”

Section: Morphology and Structurementioning

confidence: 93%

“…Mechanochemical treatment has been widely used to strengthen the extraction of valuable metals from ore or solid waste resources. The mechanism of mechanochemical treatment is to induce the transformation of the crystal structure and change the physical and chemical properties of minerals by mechanical force. , Meanwhile, the transformation of mechanical energy into internal energy brought the local ultrahigh temperature of the surface, allowing the reduction reactions to occur within the solid–solid phase; thus, no acid or extra electric field is needed. , Although mechanochemical treatment improves the leaching efficiency of insoluble manganese in EMR, leaching agents such as sodium sulfide and ferrous sulfate are expensive.…”

Section: Introductionmentioning

confidence: 99%

“…However, the reductivity and utilization rate are usually limited due to its periodicity and dense structure . Recent studies have shown that the chemical reactivity of natural pyrite can be significantly improved under mechanical force, which makes it possible to be applied in the field of EMR disposal. , Therefore, this study aims to provide a method for the enhanced recovery of manganese from EMR using natural pyrite as an assisting reductant. This approach facilitates the extraction of manganese from EMR, allowing it to be captured in the leachate, thus establishing a foundation for subsequent recycling and utilization purposes.…”

Section: Introductionmentioning

confidence: 99%

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Natural Pyrite-assisted Mechanochemical Recovery of Insoluble Manganese from Electrolytic Manganese Residue: Kinetics and Mechanisms

Xiang,

Yang,

Liu

et al. 2023

ACS EST Eng.

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Numerous traditional methods have been applied to extracting manganese from electrolytic manganese residue (EMR). However, most of them focused on the recovery of water-soluble manganese from EMR, while insoluble manganese, whose content is usually high in EMR, was generally ignored. Herein, the recovery of insoluble manganese in EMR was systematically investigated by a natural pyrite-assisted mechanochemical method. The recovery efficiency of insoluble manganese exceeded 86%, and the leaching efficiency of iron was lower than 1% under optimal conditions (the pyrite/EMR mass ratio of 4% and mechanochemical treatment at 300–500 rpm for 120 min). Toxicity characteristic leaching procedure experiments showed that after treatment the leaching concentration of manganese decreased by more than 12 times, and ammonia nitrogen decreased by 27 times, which met the regulatory discharge limit (GB/T 8978-1996). Tescan integrated mineral analyzer analysis directly confirmed that the insoluble Mn(IV) in treated EMR was completely reduced to soluble Mn(II), and iron was solidified in the forms of Fe–S-(Si–Al–O) and pyrrhotite. A potential mechanism could be that the insoluble manganese encapsulated in EMR matrix was exposed to the particle surface by the mechanochemical reaction; whereafter, the redox reaction between pyrite and insoluble Mn(IV) was facilitated by the generated crystal defects and surfaces with dangling bonds under mechanochemical action. This study provides a direction for the resource utilization of insoluble Mn(IV) in EMR and also expands the theoretical basis for exploring the reduction mechanism of pyrite-assisted mechanochemical method.

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Section: Resultsmentioning

confidence: 99%

Section: Morphology and Structurementioning

confidence: 93%