Polyferric silicate chemical conditioner and preparation method thereof

Abstract

The invention discloses a polyferric silicate chemical conditioner and a preparation method thereof. The chemical conditioner is prepared from sodium silicate, dilute sulfuric acid, ferric sulfate, ferric chloride and water, and is prepared by compounding the sodium silicate, dilute sulfuric acid, ferric sulfate and ferric chloride according to the mass ratio of (4-5): (5-6): (7-8): (13-14), the effective content of iron reaches 7%, and the effective content of silicon reaches 1%. The preparation method comprises the following steps: adding a certain amount of dilute sulfuric acid into sodiumsilicate, adding water to dilute until the pH value is 2-3, and fully stirring to obtain a solution A; adding a certain amount of ferric sulfate into the solution A, and fully stirring to obtain a solution B; and adding a certain amount of ferric chloride into the solution B until the pH value is 3-4, fully stirring, and standing. The effective content of polyferric silicate ions is obviously increased, the charge adsorption effect on sludge cells is enhanced, the oxidability is improved, the sludge dewatering performance can be effectively improved, and the sludge solid-liquid separation speed is increased. After the sludge conditioned by the polyferric silicate is filter-pressed and dewatered, the moisture content of a sludge cake is reduced, and the dosage is reduced.

Description

technical field [0001] The invention belongs to the field of chemical synthesis of organic polymer materials, and relates to a polysilicate ferric salt chemical conditioning agent and a preparation method thereof. Background technique [0002] When performing deep dehydration treatment of sludge from urban sewage treatment plants (here refers to reducing the water content of sludge to 60% or below), it is necessary to chemically condition the sludge to change the water-holding performance of the sludge particles and make the sludge The speed and degree of mud-solid-liquid separation are improved. [0003] The commonly used chemical conditioning method before is the conditioning scheme of adding "cationic polyacrylamide" and "ferric chloride + lime". Due to the special floc structure of activated sludge particles and their high hydrophilicity, the scheme of adding "cationic polyacrylamide" is adopted to form large flocs after sludge flocculation, which contains a large amoun...

AI Technical Summary

Problems solved by technology

Because common polysilicate iron salts have low effective ferrosilicon content, in the existing polysilicate iron salts, the active ingredients of polysilicate iron salts (including polysilicate iron complexes, iron ions, silicate ions , Sulfate ion, wherein, the active ingredient that can play a chemical conditioning flocculation reaction is mainly polysilicate ferric complex) below 13%, usually around 11%, and the molar ratio of iron and silicon is generally around 7:1 , the total effective content of iron and silicon is less than 5%, resulting in a relatively large amount of dosing and high processing costs

The dewatering effect of the sludge conditioned by the polysilicate iron salt is relatively general, and often does not reach the 60% moisture content of the mud cake after the sludge dewatering after the conditioning is advertised.

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