Preparation and Characteristics of Polyaluminium Chloride by Utilizing Fluorine-Containing Waste Acidic Mother Liquid from Clay-Brine Synthetic Cryolite Process

Table 2

Optimization experiment to prepare PAC by SCML leaching bauxite.

Sample	Acid	Alkali	Al2O3 (%)	Basicity (%)	Insoluble solid in water (%)
A	SCML	Calcium aluminate	28.7	87	11.2
B	SCML + HCl	Calcium aluminate	29.1	79	5.8
C	SCML + HCl	Sodium aluminate	30.2	66	1.5