Method for preparing oxidized form polysilicic acid ferro-aluminum coagulant

Abstract

The invention discloses a method for preparing an oxidized form polysilicic acid ferro-aluminum coagulant. The method includes the following steps that (1) a sodium silicate solution is added to a dilute sulphuric acid solution under the stirring condition, the pH value is adjusted to acidity, and standing and polymerization are conducted on the mixture to obtain low-polymerization-degree activated silicic acid; (2) ferric sulfate and aluminum sulfate are added to concentrated sulfuric acid and water to prepare an acidic sulfate ferro-aluminum solution; (3) low-polymerization-degree activated silicic acid and the acidic sulfate ferro-aluminum solution are mixed and stirred, an oxidizing agent and additive are added, stirring is stopped, after standing and curing are conducted, a stabilizing agent is added, and then liquid products are obtained; (4) the liquid products are dried and grinded to obtain the powder coagulant. The products prepared from the method combine the advantages of an iron coagulant and an aluminum coagulant, the defects of polyaluminum chloride and polyferric sulfate coagulants in the using process are overcome, and the products have the advantages of capable of integrating the polysilicic acid cementation, aggregation, adsorption and bridging effects, large in aluminum salt coagulant floc, good in decoloration performance, dense in ferric salt coagulant floc, and high in settling speed.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to an oxidized polysilicate aluminum iron coagulant. Background technique [0002] Coagulant is an important agent used in the operation of solid-liquid phase separation unit. In the current wastewater pollution treatment in our country, the promotion and application of chemical coagulation technology is a cost-effective, effective large-scale control and reduction of wastewater pollution and protection. effective means for the environment. Because the object of coagulation treatment and the type and nature of water quality are different, the original single-species inorganic coagulant can no longer meet the needs, so new varieties and composite coagulants appear accordingly. Inorganic polymer coagulants and their composites It is the mainstream coagulant currently developed. Polymerized iron aluminum silicate is a new type of inorganic polymer coagulant, which is a compound of poly...

AI Technical Summary

Problems solved by technology

Although the polyaluminosilicate iron coagulant has many advantages, it is not enough to remove organic matter. In order to improve the composite function of the coagulant in water treatment, it is necessary to study the multifunctional coagulant with enhanced coagulation effect. , but so far, there are very few multifunctional polysilicate aluminum iron coagulants related to strengthening the coagulation effect. At present, the polysilicate aluminum iron coagulants that have been studied more are relatively simple and do not have enhanced oxidation functions.