Interaction of PACls with sulfate

Article type: Research Article

Authors: XU, Yi | WANG, Dong-Sheng | TANG, Hong-Xiao

Affiliations: SKLEAC, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

Note: [] Corresponding author. E-mail: [email protected]

Abstract: This article discusses the influential factors on Al_{13} separation considering the interaction of sulfate with various polyaluminum chloride (PACl). The experimental results showed that the basicity (B=[OH]/[Al]), the concentration of PACl and Al/SO_4 ratio exhibited significant roles in the PACl-sulfate reaction. It indicated that different species in various PACl underwent different reaction pathway with sulfate. The Al_c, colloidal species, formed precipitation quickly with sulfate, while Al_b, oligomers and polymers, undergoes slow crystallization. And Al_a, monomers, reacts with sulfate to form soluble complexes. The kinetic difference of reaction made it possible to realize the separation of Al_b and further purification. The decrease of Al_a resulted in the limit of ferron method was also mentioned.

Keywords: PACl, sulfate, Al[TeX:] _{13}, kinetic, separation

Journal: Journal of Environmental Sciences, vol. 16, no. 3, pp. 420-422, 2004