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[Physical and chemical properties] The structural formula of polysilicate ferric sulfate (PFSS) is [Fe 2 (SiO 2 ) n (SO 4 ) 3-n ] m , which is a gray-green or red-brown liquid with a solid content of 2% to 5%.
It is a kind of The newer inorganic polymer flocculant has a significantly better flocculation effect than polyferric sulfate or other single anion and cation inorganic polymer flocculants, and is suitable for the coagulation treatment of low temperature and low turbidity water
.
This is because the activated polysilicic acid in polysilicate ferric sulfate is a type of anionic inorganic polymer flocculant, while the metal iron polymer is a cationic inorganic polymer flocculant.
[Preparation]
(1) Dilute a measured amount of sodium silicate with water to a certain concentration, add sulfuric acid to adjust the pH value, place it for a certain period of time to polymerize the silicic acid, then add a measured amount of ferric sulfate , mix well, and aging for a certain period of time to obtain polysilicate sulfuric acid Iron
.
Preparation method The synthesis of poly-iron coagulant incorporating silicon
.
Take a certain amount of calibrated FeCl 3 solution in a small beaker, add an appropriate amount of hydrochloric acid for acidification, then add an appropriate amount of distilled water, and then slowly pour the set amount of sodium monosilicate solution under rapid stirring, and continue to stir for 5 minutes to mix it Evenly, slowly titrate it to different OH/Fe ratios with a sodium hydroxide solution of known concentration , and finally transfer it to a volumetric flask, dilute to the mark with distilled water to obtain a composite polymer iron coagulant with silicate ions introduced
(2) Chinese patent 200510094967.
1 introduces a method for preparing polysilicate aluminum ferric sulfate using metallurgical slag as raw material
.
The prepared polysilicate aluminum ferric sulfate is suitable for processing high turbidity suspensions, domestic sewage and industrial wastewater
Prepare a sulfuric acid solution with a concentration of 10% for use
.
The converter sludge and blast furnace slag are mixed at 2:1 (mass ratio), and then the prepared sulfuric acid solution is added, acidified for a certain period of time, after the slag is completely dissolved, it is suction filtered, and the filtrate is taken out for use
(3) Chinese patent 200310108445.
3 introduces a one-step production method of solid polysilicate ferric sulfate
.
In this process, solid raw material ferrous sulfate monohydrate is mixed with sodium silicate, nitric acid and sulfuric acid at room temperature, and stirred, and the raw materials undergo oxidation and polymerization reactions to obtain a solid polysilicate ferric sulfate product
At room temperature, add a certain amount of ferrous sulfate monohydrate and sodium silicate solid to the polytetrachloroethylene container respectively, mix them evenly, and then add the mixed solution of nitric acid and sulfuric acid
.
The reaction time is 48h, and the reaction temperature is 25-61°C.
Polysilicate ferric sulfate is a compound modified salt coagulant of PFS
.
Through the coagulation performance test, the results show that polysilicate ferric sulfate shows superior turbidity removal ability than PFS in a larger dosage area, and the floc settling performance is also better
