Environmental & Analytical Toxicology

Mingming He

Publications

• Research Article
  Recovery of Alumina from Coal Fly Ash by CaCl2 Calcination Followed by H2SO4 Leaching
  Author(s): Yinglong Sun, Zhenkai Liang, Fangyan Sun, Shichao He, Mingming He, Bangda Wang and Yi WangYinglong Sun, Zhenkai Liang, Fangyan Sun, Shichao He, Mingming He, Bangda Wang and Yi Wang
  
  In this paper, a calcination-leaching method by using CaCl2 and H2SO4 to recover alumina from coal fly ash (CFA) is developed. The process conditions including the parameters of CaCl2 content, calcination temperature and time, acid concentration and leaching time are studied. Heat treatment under 900°C for 1 h of the ash with 80 wt.% CaCl2 significantly enhances the alumina leachability (>96.6%) in comparison with the directing acid-leaching (2.31-4.78%) method. The recovery rate increases dramatically with the increasing of CaCl2 content from 20% to 80%, and a H2SO4 leaching time from 10 minutes to 1 hour as well, but it remains near constantly as the increasing of CaCl2 dosage >80% or acid-leaching time >1 h. The reaction mechanism is studied by X-ray diffraction (XRD) analysis to determine the crystalline phases change. The results indicate that quartz, mullite and am.. Read More»
  DOI: 10.4172/2161-0525.1000427

  Abstract PDF