Preparation method of decolorizing flocculant

The present invention discloses a method for preparing a flocculant, belonging to the technical field of water treatment agent manufactured. Dicyandiamide - formaldehyde polycondensate flocculant necessary to heat the raw material in the production process, to initiate the condensation reaction. The method of preparation of the present invention is: dicyandiamide, formaldehyde, ammonium chloride was added to the reactor in proportion mixing, further adding a certain amount of calcium chloride, calcium chloride was dissolved in hot water sometimes causes release of reactor partial bottom feed temperature rises, causing dicyandiamide - formaldehyde condensation reaction. Bleaching agents prepared using the present invention, it eliminates external heat source, reducing energy consumption, equipment investment cost savings, reducing the chance of generation of bumping; calcium ions to the formation of flocs settling velocity accelerated, enhanced coagulation efficiency, improve the effectiveness of the product, and create favorable conditions for the bleaching agent in the field of water treatment is more widely used. Flocculant is mainly used for printing and dyeing, leather, paper and other industrial waste water to remove chromaticity, COD and SS.