Polysilicate-metals composite flocculant and preparation method thereof

Abstract

The invention discloses polysilicate-metals composite flocculant and a preparation method thereof and relates to flocculant for water treatment and the preparation method thereof. The method aims to solve the technical problem that the alkalization degree and polymerization degree of flocculant are increased by externally increasing alkalizer so water treatment cost is increased in the conventional polysilicate-metals composite flocculant. The polysilicate-metals composite flocculant is prepared from silicate, aluminum salt, ferric salt, an assistant agent A and an assistant agent B in a weight ratio, wherein the assistant agent A is one or combination of phosphate, calcium oxide, polyacrylamide, and chitosan; and the assistant agent B is one or combination of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate. The method comprises the following steps of: adjusting pH of the aqueous solution of silicate, stirring and standing to obtain solution of polysilicate, and then adding the aluminum salt, the ferric salt, the assistant agent A and the assistant agent B, and mixing uniformly to obtain the polysilicate-metals composite flocculant. Other agents are not needed to be added, and the polysilicate-metals composite flocculant is low in cost and can be used for the field of water treatment.

Description

technical field

[0001] The invention relates to a flocculant for water treatment and a preparation method thereof. Background technique

[0002] Flocculation is an important water purification method widely used in drinking water treatment and sewage treatment. In drinking water treatment, flocculation sedimentation is an effective means to remove suspended solids and colloids in raw water; in sewage treatment, it can be used as pretreatment before biochemical treatment, or can be strengthened synchronously with biochemical treatment, which can efficiently remove suspended solids and improve Biodegradability of sewage. At present, the commonly used polysilicate metal salt composite coagulant needs to add a large amount of alkalizing agent, such as NaOH, to enhance the degree of alkalization and polymerization of the coagulant, which increases the cost of water treatment. Contents of the invention

[0003] The present invention is to solve the technical problem that the e...