Extraction of Water Treatment Coagulant from Locally Abundant Kaolin Clays

Table 2

Optimised sulphuric acid extraction conditions for alum from kaolin clay.

Particle size; (m)	Acid conc. (M)	Acid : kaolin ratio; (w/w)	Leaching		Calcination		Extraction; (wt.%)
			Temperature (°C)	Time (min)	Temperature (°C)	Time (min)
100	4	6 : 1	100	90	800	60	66.95