Preparation of Rare-Earth Containing Coagulant and Treatment for the Municipal Wastewater

Preparation of Rare-Earth Containing Coagulant and Treatment for the Municipal Wastewater
　　Two kinds of methods (one is to adjust basicity by adding calcium oxide ,the other is electrolysis)were used to prepare rare-earth containing compound coagulants. These methods for preparing Polymerize Aluminum Chloride (PAC) were reported early ,but to prepare rare-earth containing compound coagulants are not reported,We firstly use these methods to magnet lifter prepare rare-earth containing compound coagulants .
　　Each of them has its advantages and disadvantages, the first one is time-saving, it only needs eight hours(including aging time),but its disadvantage is difficult to prepare higher basicity , concentrating and stable products .Electrolysis method(the second one)can easily get stable and concentrating coagulant ,but its disadvantage is time-consuming.The complex colorimetric magnet lifter method showed aluminum species distribution of the products (RE) prepared by method one is the same as the industrial PAC. Aluminum species distribution of products (PACR)