RESEARCH ARTICLE


Alkalic Leaching and Stabilization of Arsenic from Pyrite Cinders



Yongliang Wang1, Li Xiao1, 2, Ya Liu1, 2, Guoyan Fu1, 2, Shufeng Ye1, *, Yunfa Chen1
1 State Key Laboratory of Multiphase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing100190, China
2 Institute of Process Engineering, University of Chinese Academy of Sciences, Beijing100049, China


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© 2017 Wang et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Key Lab. Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Tel: 010-82544923; E-mail: sfye@ipe.ac.cn


Abstract

Introduction:

Pyrite cinder is one of the important secondary resources, but typically contains a certain amount of arsenic, which is harmful to metallurgical process. It usually hopes to remove the arsenic prior to recycle the valuable element in the pyrite cinders.

Methods & Materials:

In this study, the arsenic in the cinders was selectively removed using the alkalic leaching method so as to reduce the loss of ferric and other valuable elements.

Results & Discussion:

The content of arsenic in pyrite cinders was reduced to 0.08% through the investigation of the factors, including particle size, alkaline concentration, temperature, solid-liquid ratio (S/L) and leaching time. Then, the ferric precipitation method was used to remove the arsenic in the leaching solution. More than 99% of the arsenic can be removed by controlling the pH and the ratio of ferric and arsenic (Fe/As) in ambient temperature, and the arsenic concentration in the solution was reduced to less than 0.5mg/L.

Conclusion:

It was found that the precipitated arsenic was mainly amorphous based on the analysis of sediment.

Keywords: Arsenic, Pyrite cinders, Alkaline leaching, Precipitation, Ferric sulfate, Solid-Liquid Ratio.