Interaction of PACls with sulfate

摘要

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, underwent slow crystallization. And Al a, monomers, reacted 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.