Zn leaching recovery and mechanisms from end-of-life tire rubber

Shiyu Li; Thien Q. Tran; Qi Li; Bin Ji; Alexander S. Brand; Wencai Zhang

doi:10.1016/j.resconrec.2023.107004

Zn leaching recovery and mechanisms from end-of-life tire rubber

Shiyu Li, Thien Q. Tran, Qi Li, Bin Ji, Alexander S. Brand, Wencai Zhang

Mining Engineering

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Experiments were conducted to investigate the leaching behavior of Zn from end-of-life tire rubber. XRD and XPS analyses showed that the Zn-containing phase in the material was mainly ZnO. SEM-EDS analysis confirmed the presence of both exposed and encapsulated ZnO particles. Acid leaching tests indicated that the carbon black comprised in the material can be oxidized and dissolved by HNO₃, resulting in the dissolution of completely encapsulated ZnO particles with thinner covering layers. Then, leaching tests using HNO₃ as the lixiviant were performed by varying acid concentration and leaching temperature. The results showed over 98% of Zn can be recovered using 2.0 mol/L HNO₃ at 90 ℃ after 400 min of reaction. Leaching kinetic results were best fit with the Avrami model, indicating the leaching process was controlled by diffusion. The activation energy determined by Arrhenius formula was 12.92 kJ/mol, which further supports the proposed diffusion controlled leaching process.

Original language	English
Article number	107004
Journal	Resources, Conservation and Recycling
Volume	194
DOIs	https://doi.org/10.1016/j.resconrec.2023.107004
State	Published - Jul 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Funding

This study was funded through the Center for Tire Research, Project SUST-2021-D14-4. The authors acknowledge Lehigh Technologies for providing the waste tire rubber.

Funders	Funder number
Lehigh Technologies

Keywords

Kinetics
Leaching
Recovery
Tire rubber
Zinc

ASJC Scopus subject areas

Waste Management and Disposal
Economics and Econometrics

Access to Document

10.1016/j.resconrec.2023.107004

Cite this

@article{c915921170b84b719021216e1364d933,

title = "Zn leaching recovery and mechanisms from end-of-life tire rubber",

abstract = "Experiments were conducted to investigate the leaching behavior of Zn from end-of-life tire rubber. XRD and XPS analyses showed that the Zn-containing phase in the material was mainly ZnO. SEM-EDS analysis confirmed the presence of both exposed and encapsulated ZnO particles. Acid leaching tests indicated that the carbon black comprised in the material can be oxidized and dissolved by HNO3, resulting in the dissolution of completely encapsulated ZnO particles with thinner covering layers. Then, leaching tests using HNO3 as the lixiviant were performed by varying acid concentration and leaching temperature. The results showed over 98% of Zn can be recovered using 2.0 mol/L HNO3 at 90 ℃ after 400 min of reaction. Leaching kinetic results were best fit with the Avrami model, indicating the leaching process was controlled by diffusion. The activation energy determined by Arrhenius formula was 12.92 kJ/mol, which further supports the proposed diffusion controlled leaching process.",

keywords = "Kinetics, Leaching, Recovery, Tire rubber, Zinc",

author = "Shiyu Li and Tran, {Thien Q.} and Qi Li and Bin Ji and Brand, {Alexander S.} and Wencai Zhang",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2023",

month = jul,

doi = "10.1016/j.resconrec.2023.107004",

language = "English",

volume = "194",

}

TY - JOUR

T1 - Zn leaching recovery and mechanisms from end-of-life tire rubber

AU - Li, Shiyu

AU - Tran, Thien Q.

AU - Li, Qi

AU - Ji, Bin

AU - Brand, Alexander S.

AU - Zhang, Wencai

PY - 2023/7

Y1 - 2023/7

N2 - Experiments were conducted to investigate the leaching behavior of Zn from end-of-life tire rubber. XRD and XPS analyses showed that the Zn-containing phase in the material was mainly ZnO. SEM-EDS analysis confirmed the presence of both exposed and encapsulated ZnO particles. Acid leaching tests indicated that the carbon black comprised in the material can be oxidized and dissolved by HNO3, resulting in the dissolution of completely encapsulated ZnO particles with thinner covering layers. Then, leaching tests using HNO3 as the lixiviant were performed by varying acid concentration and leaching temperature. The results showed over 98% of Zn can be recovered using 2.0 mol/L HNO3 at 90 ℃ after 400 min of reaction. Leaching kinetic results were best fit with the Avrami model, indicating the leaching process was controlled by diffusion. The activation energy determined by Arrhenius formula was 12.92 kJ/mol, which further supports the proposed diffusion controlled leaching process.

AB - Experiments were conducted to investigate the leaching behavior of Zn from end-of-life tire rubber. XRD and XPS analyses showed that the Zn-containing phase in the material was mainly ZnO. SEM-EDS analysis confirmed the presence of both exposed and encapsulated ZnO particles. Acid leaching tests indicated that the carbon black comprised in the material can be oxidized and dissolved by HNO3, resulting in the dissolution of completely encapsulated ZnO particles with thinner covering layers. Then, leaching tests using HNO3 as the lixiviant were performed by varying acid concentration and leaching temperature. The results showed over 98% of Zn can be recovered using 2.0 mol/L HNO3 at 90 ℃ after 400 min of reaction. Leaching kinetic results were best fit with the Avrami model, indicating the leaching process was controlled by diffusion. The activation energy determined by Arrhenius formula was 12.92 kJ/mol, which further supports the proposed diffusion controlled leaching process.

KW - Kinetics

KW - Leaching

KW - Recovery

KW - Tire rubber

KW - Zinc

UR - http://www.scopus.com/inward/record.url?scp=85153058663&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85153058663&partnerID=8YFLogxK

U2 - 10.1016/j.resconrec.2023.107004

DO - 10.1016/j.resconrec.2023.107004

M3 - Article

AN - SCOPUS:85153058663

SN - 0921-3449

VL - 194

JO - Resources, Conservation and Recycling

JF - Resources, Conservation and Recycling

M1 - 107004

ER -

Zn leaching recovery and mechanisms from end-of-life tire rubber

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this