NDLI: Using CaO to stabilize arsenic sulfide slag by moderate temperature calcination

Content Provider	Springer Nature Link
Author	Lu, Qiong Xiao, Hongxia Du, Ying Du, Dongyun
Copyright Year	2017
Abstract	This study was conducted to investigate the stabilization of arsenic sulfide slag (ASS) with CaO calcinations at moderate temperature, including the effects of calcination temperature and different As/Ca molar ratios on arsenic leaching concentration. In the process of calcination for arsenic-contained waste, 90.95–97.23% of arsenic was reserved and the original waste was transformed into a dense and liquation state, which could physically wrap arsenic and reduce its leaching concentration. Meanwhile, the decrease in the As/Ca molar ratios was conducive to the formation of Ca$_{5}$(AsO$_{4}$)$_{3}$(OH). When As/Ca molar ratio was less than 1:8, there was excessive CaO and the ASS samples stopped reacting with CaO. The results showed that the leaching concentration of arsenic was 4.08 mg/L when As/Ca molar ratio was 1:8 and the ASS sample was calcined for 2 h at temperature of 550 °C. In the process, arsenic’s chemical reaction and physical wrapping resulted in a remarkable decrease in its leaching concentration.
Starting Page	1
Ending Page	6
Page Count	6
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	76
Issue Number	6
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-03-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arsenic sulfide slag (ASS) Leaching properties Calcination Solidification Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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