Reclamation of a waste arsenic-bearing gypsum as a soil conditioner via acid treatment and subsequent Fe(II)As stabilization

As a common hazardous waste in metallurgical industry, arsenic-bearing gypsum (ABG) is a great threat to ecological safety. However, the recycle of ABG has rarely been conducted due to its high arsenic mobility and worthless constituents. In this study, an ABG was successfully reclaimed as a soil co...

Full description

Saved in:
Bibliographic Details
Published in:Journal of cleaner production 2019-04, Vol.217, p.22-31
Main Authors: Yang, Dazhong, Sasaki, Atsushi, Endo, Masatoshi
Format: Article
Language:English
Subjects:
Acid washing
Fe(II)[sbnd]As stabilization
Gypsum reclamation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:As a common hazardous waste in metallurgical industry, arsenic-bearing gypsum (ABG) is a great threat to ecological safety. However, the recycle of ABG has rarely been conducted due to its high arsenic mobility and worthless constituents. In this study, an ABG was successfully reclaimed as a soil conditioner via acid treatment and Fe(II)As stabilization. Firstly, the arsenic content of ABG was decreased below Japan standard (150 mg/kg) regarding safe materials by acid treatment (H2SO4H3PO4). Then upon heating oxidation, Fe2+ was used to stabilize the arsenic remaining in gypsum sludge at weakly acidic condition (pH 4) via forming insoluble FeAs compounds. In toxicity characteristic leaching procedure (TCLP), the arsenic leaching (0.125 mg/L) from reclaimed gypsum was much lower than TCLP limitation (5 mg/L). And in Japan standard leaching test (JSLT), it was suppressed below the Japan environmental criteria (
ISSN:0959-6526
1879-1786
DOI:10.1016/j.jclepro.2019.01.217