Next Article in Journal
Origins and Geochemistry of Oolitic Dolomite of the Feixianguan Formation from the Yudongzi Outcrop, Northwest Sichuan Basin, China
Previous Article in Journal
Concentration at the Minimum Bubble Velocity (CMV) for Various Types of Flotation Frothers
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Minerals 2017, 7(7), 119; https://doi.org/10.3390/min7070119

Microwave-Supported Leaching of Electric Arc Furnace (EAF) Slag by Ammonium Salts

1
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
The Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology, Yangtze Normal University, Chongqing 408100, China
*
Author to whom correspondence should be addressed.
Received: 1 June 2017 / Revised: 1 July 2017 / Accepted: 7 July 2017 / Published: 13 July 2017
View Full-Text   |   Download PDF [4020 KB, uploaded 13 July 2017]   |  

Abstract

The effect of microwave-supported leaching of electric arc furnace (EAF) slag by ammonium salts was investigated to improve calcium leaching ratio for CO2 mineral sequestration process. The results show that the calcium leaching ratio from EAF slag at the constant temperature in the microwave field increases about 10% than that under the water bath at the same leaching time. The greater the microwave power, the higher the impact of calcium leaching rate, which proves that microwave treatment can improve the leaching ratio of calcium. The rapid calcium leaching step (up to 5 min) is possibly due to the easy reaction of calcium silicate, while the slower calcium leaching step (after 5 min) is owing to the difficult reaction of calcium ferroaluminates for the hydrolysis of iron and aluminum. The leaching behaviors of magnesium and calcium ions affected by different leaching parameters are similar and the concentration of aluminum, iron and phosphorus can be neglected. Calcium ion is probably not precipitated in the real leaching solution from steel slag by ammonium chloride solution as its concentration is less than 0.32 mol/L. However, the concentration of magnesium ion starts to drop sharply when the pH value is higher than 10 and it has precipitated completely at pH value of 11.6. View Full-Text
Keywords: microwave; EAF slag; leaching; ammonium chloride; kinetics microwave; EAF slag; leaching; ammonium chloride; kinetics
Figures

Figure 1a

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

Tong, Z.; Ma, G.; Zhang, X.; Cai, Y. Microwave-Supported Leaching of Electric Arc Furnace (EAF) Slag by Ammonium Salts. Minerals 2017, 7, 119.

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