Next Article in Journal
Titanite Ores of the Khibiny Apatite-Nepheline-Deposits: Selective Mining, Processing and Application for Titanosilicate Synthesis
Next Article in Special Issue
Understanding Heterogeneity of a Slag-Derived Weathered Material: The Role of Automated SEM-EDS Analyses
Previous Article in Journal
Kaolinite Claystone-Based Geopolymer Materials: Effect of Chemical Composition and Curing Conditions
Previous Article in Special Issue
Effect of Lime on Stability of Chromium in Stainless Steel Slag
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Minerals 2018, 8(10), 445; https://doi.org/10.3390/min8100445

Stability of Chromium in Stainless Steel Slag during Cooling

1
Key Laboratory for Ecological Metallurgy of Multimetallic Minerals (Ministry of Education), Northeastern University, Shenyang 110819, China
2
School of Metallurgy, Northeastern University, Shenyang 110819, China
3
WISDRI Engineering & Research Incorporation Limited, Wuhan 430223, China
*
Author to whom correspondence should be addressed.
Received: 21 August 2018 / Revised: 4 October 2018 / Accepted: 9 October 2018 / Published: 11 October 2018
(This article belongs to the Special Issue Metallurgical Slags)
Full-Text   |   PDF [3880 KB, uploaded 11 October 2018]   |  

Abstract

The chromium elution behavior of stainless steel (SS) slag depends highly on the chromium distribution, and the molten modification process proved to effectively improve the chromium enrichment in stable phases. However, the phase transformation and variation of chromium stability during the subsequent cooling process is still poorly understood. In this work, the phase composition and chromium distribution of SS slag from different quenching temperatures were experimentally studied, and the stability of chromium-bearing phases was evaluated using standard leaching tests. The results indicated that dicalcium silicate and spinel phases had formed in the molten slag at 1600 °C, while the dicalcium silicate disappeared and the phases of merwinite and melilite precipitated when the temperature decreased from 1600 to 1300 °C (at a rate of 5 °C/min). During this cooling process, the chromium migrated from other phases into the spinel, significantly suppressing the chromium elution. The leaching results also demonstrated that the potential chromium-bearing phases of glass, dicalcium silicate and merwinite are unstable and are presumably the main source of chromium release. The treated SS slag meets the requirements for the utilization of chromium-bearing slag in the cement and brick industries. View Full-Text
Keywords: metallurgical slag; stainless steel slag; chromium pollution; cooling process; phase transformation metallurgical slag; stainless steel slag; chromium pollution; cooling process; phase transformation
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Zhao, Q.; Liu, C.; Cao, L.; Zheng, X.; Jiang, M. Stability of Chromium in Stainless Steel Slag during Cooling. Minerals 2018, 8, 445.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Minerals EISSN 2075-163X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top