Alkalic Leaching and Stabilization of Arsenic from Pyrite Cinders
Yongliang Wang1, Li Xiao1, 2, Ya Liu1, 2, Guoyan Fu1, 2, Shufeng Ye1, *, Yunfa Chen1
Identifiers and Pagination:Year: 2017
First Page: 41
Last Page: 50
Publisher Id: TOWMJ-10-41
Article History:Received Date: 31/08/2017
Revision Received Date: 2/11/2017
Acceptance Date: 17/11/2017
Electronic publication date: 30/11/2017
Collection year: 2017
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.
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.