Alternative Method for the Treatment of Hydrometallurgical Arsenic-Calcium Residues: The Immobilization of Arsenic as Scorodite.

ABSTRACT: Arsenic-calcium residue (ACR) is one of the major hazardous solid wastes produced by the metallurgical industry that poses a serious threat to the environment. However, a suitable method for the effective treatment of ACR is still lacking. In this study, an alternative treatment method for ACRs via the immobilization of As as scorodite was proposed with the use of two types of ACRs (ACR_real directly collected from a Pb refinery and ACR_lab precipitated from waste sulfuric acid in the lab). The treatment of ACR included preparing the As-enriched solution via H₂SO₄ dissolution-neutralization of ACR at pH < 2, As(III) was oxidized by H₂O₂, and As(V) was immobilized as scorodite. The results showed that gypsum produced from ACR

SUBMITTER: Ma X 

PROVIDER: S-EPMC7288567 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature