Abstract
The preparation of basic aluminum chloride coagulants from clay was studied.Clay calcined at 600 C for an hour was dissolved in(1)10% hydrochloric acid and (2) 1, 10r 2, 1 (eq.) mixture of hydrochloric and sulfuric acids with hydrogen ion which corresponded to iO% hydrochloric acid. To make the solution basic (1) hydrochloric acid was removed at the boiling point and(2)a part of sulfuric acid was precipitated as sulfates by adding BaCO3, CaCOs and Ca(OH)2 to the solution.Coagulants prepared by these methods were subjected to coagulation test and proved to be effective in the lower pH region as coinpared with commercial BAC solution.
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