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
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.
It was found that the precipitated arsenic was mainly amorphous based on the analysis of sediment.
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* 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: email@example.com