| 摘要 |
PROBLEM TO BE SOLVED: To produce a coagulant satisfying excellent characteristics only with a simple operation by adding a mixture of alkaline silicate and starch to an acidic aqueous solution containing trivalent iron ions or tetravalent titanium ions and mixing them. SOLUTION: While the acidic aqueous solution 1 containing the tetravalent titanium ions or trivalent iron ions (a titanium tetrachloride-, or a titanium sulfate aqueous solution, or a ferric chloride-, a ferric sulfate-, a poly-ferric sulfate-aqueous solution or a these mixture solution is preferable) is stirred with an agitator 4, the mixture liquid 2 (a water glass and starch mixed aqueous solution) of the alkaline alkali silicate aqueous solution (this is an aqueous solution of sodium silicate, potassium silicate, and water glass, etc., and the water glass aqueous solution is especially suitable, and powder alkali silicate may be directly added to the tetravalent titanium ion- or trivalent iron ion- containing aqueous solution to be mixed) and the starch, is added to the acidic aqueous solution 1 to be mixed. Thus, a novel coagulant having a large coagulation effect can be easily produced with a simple operation without a trouble of gelation.
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