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 All 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.