The invention discloses a water purifying agent for chemical industries such as
coal chemical industry and coking industry and a preparation method of the water purifying agent. The water purifying agent comprises the following components in parts by
mass: 5 to 10 parts of
carboxymethyl cellulose (CMC), 5 to 10 parts of modified
chitosan, 5 to 10 parts of
phenolic aldehyde, 25 to 40 parts of composite dual-acid aluminum iron, 1 to 3 parts of
xanthan gum, 1 to 3 parts of cationic
guar gum, 5 to 10 parts of an acid solution, 25 to 40 parts of
aluminum potassium sulfate dodecahydrate, 20 to 40 parts of
polyacrylamide, 25 to 60 parts of
polyferric sulfate, and 2 to 5 parts of ST. Compared with a traditional water purifying agent, the use amount of a flocculating agent is greatly reduced, resources are saved, and the cost is low; the
effluent quality is good; aiming at
coal chemical industry wastewater and coking industry
wastewater with complex components, the combined water purifying agent with different components and different functions is adopted, coagulation, adsorption, wrapping,
sedimentation and decoloration occur quickly, and the effect of getting twofold results with half theeffort in COD removal rate can be achieved; and the
effluent quality meets increasingly strict emission standards and laws and regulations.