Next Article in Journal
An Innovative Agro-Forestry Supply Chain for Residual Biomass: Physicochemical Characterisation of Biochar from Olive and Hazelnut Pellets
Next Article in Special Issue
Leaching Behavior of Circulating Fluidised Bed MSWI Air Pollution Control Residue in Washing Process
Previous Article in Journal
General Forced Oscillations in a Real Power Grid Integrated with Large Scale Wind Power
Article Menu

Export Article

Open AccessArticle
Energies 2016, 9(7), 524; doi:10.3390/en9070524

Suppressing Heavy Metal Leaching through Ball Milling of Fly Ash

State Key Laboratory for Clean Energy Utilisation, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ola Eriksson
Received: 4 May 2016 / Revised: 18 June 2016 / Accepted: 30 June 2016 / Published: 8 July 2016
(This article belongs to the Special Issue Energy and Waste Management)
View Full-Text   |   Download PDF [2949 KB, uploaded 8 July 2016]   |  

Abstract

Ball milling is investigated as a method of reducing the leaching concentration (often termed stablilization) of heavy metals in municipal solid waste incineration (MSWI) fly ash. Three heavy metals (Cu, Cr, Pb) loose much of their solubility in leachate by treating fly ash in a planetary ball mill, in which collisions between balls and fly ash drive various physical processes, as well as chemical reactions. The efficiency of stabilization is evaluated by analysing heavy metals in the leachable fraction from treated fly ash. Ball milling reduces the leaching concentration of Cu, Cr, and Pb, and water washing effectively promotes stabilization efficiency by removing soluble salts. Size distribution and morphology of particles were analysed by laser particle diameter analysis and scanning electron microscopy. X-ray diffraction analysis reveals significant reduction of the crystallinity of fly ash by milling. Fly ash particles can be activated through this ball milling, leading to a significant decrease in particle size, a rise in its BET-surface, and turning basic crystals therein into amorphous structures. The dissolution rate of acid buffering materials present in activated particles is enhanced, resulting in a rising pH value of the leachate, reducing the leaching out of some heavy metals. View Full-Text
Keywords: ball milling; MSWI fly ash; heavy metals; stabilization; water washing ball milling; MSWI fly ash; heavy metals; stabilization; water washing
Figures

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 alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Chen, Z.; Lu, S.; Mao, Q.; Buekens, A.; Chang, W.; Wang, X.; Yan, J. Suppressing Heavy Metal Leaching through Ball Milling of Fly Ash. Energies 2016, 9, 524.

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]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top