Title

Immobilization of Hazardous Ferronickel Slag Treated using Ternary Limestone Calcined Clay Cement

Abstract

This study aims to develop the limestone calcined clay (LC3) as a low-carbon treatment to immobilize waste ferronickel slag (FNS) containing heavy metals. The results indicate that the ordinary portland cement (OPC) and limestone calcined clay cement (LC3) adequately immobilized the Chromium (Cr), with the leaching results of 0.10-0.30 mg/L. The LC3 cement provided superior Mn immobilization (lower than 5 mg/L) compared to OPC. Calcium aluminum silicate hydrate (C-A-S-H) and ettringite (AFt) were the two main hydrated products of LC3 that ensure the capacity to encapsulate metals. The LC3 specimens had the lower porosity between 50 and 10,000 nm compared to that of OPC. The Embodied Energy (EE) and Embodied Carbon Emissions (ECO2e) of per m3 LC3 remarkably decreased by 38.21% and 44.77%.

Department(s)

Civil, Architectural and Environmental Engineering

Comments

The authors gratefully acknowledge the financial support provided by the Science and Technology Project of Shenzhen , China (No. JCYJ20180305124844894) and the National Natural Science Foundation of China (No. 51778368 ).

Keywords and Phrases

Environmental assessment; Ferronickel slag; Heavy metal leaching; Limestone calcined clay cement; Solidification/stabilization

International Standard Serial Number (ISSN)

0950-0618

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2020 Elsevier, All rights reserved.

Publication Date

30 Jul 2020

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