... high pure aluminium sulphate, 100,000 tons of liquid aluminium sulphate. Alum Series: Yearly produce 30,000 ... .2.mainly used to make pigment such as Ferric Oxide series products (such as iron oxide red ... water treatment, for purification of water, for producing ferric sulfate, for iron containing catalyst, or as additive ... be used to make pigment such as red ferric oxide etc. Also can used to improve the ...