A kind of preparation method of polysilicic acid modified hydrotalcite material for sewage treatment
A technology for polymerizing silicic acid and sewage treatment. It is used in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of instability, single use, and easy gelation of polysilicic acid. , to achieve a wide range of uses, the effect of reducing turbidity in water
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Embodiment 1
[0033] Preparation of hydrotalcite-like:
[0034] a) 1mol / L of ZnSO 4 .7H 2 O aqueous solution and 1mol / L Al(NO 3 ) 3 ·6H 2 The aqueous solution of O is slowly mixed under stirring, and the pH is maintained between 8.5-9.5 with 1mol / L NaOH aqueous solution, and the reaction temperature is 65-75°C; ZnSO 4 .7H 2 O and Al(NO 3 ) 3 ·6H 2 The molar ratio of O is 2.5:1;
[0035] b) Stir and age for 6-8 hours, cool down and filter, put the obtained precipitate into an atmosphere furnace protected by nitrogen and raise it from room temperature to 400-500°C for calcination, the heating rate is 10°C / min, and the calcination time is 16-18h, After the calcination is completed, the temperature is naturally cooled to room temperature to obtain a hydrotalcite-like material, and its scanning electron microscope spectrum is as followsfigure 1 shown;
[0036] c) 100g of hydrotalcite-like material is placed in 600ml of Fe with a concentration of 2mol / L 2 (SO 4 ) 3 In aqueous solutio...
Embodiment 2
[0039] Preparation of polymeric silicic acid modified hydrotalcite material for sewage treatment:
[0040] 1) 30 g of the modified hydrotalcite prepared in Example 1 is made into a 3% wt water slurry suspension, then 0.6 g of sodium polyphosphate and 0.3 g of magnesium oxide are added, and stirred at a speed of 6000 rpm by a high-speed disperser 0.5-1h to obtain modified hydrotalcite-like suspension;
[0041] 2) Prepare sodium silicate into 20-30%wt aqueous solution, then dropwise add 0.2mol / L sulfuric acid aqueous solution to maintain the pH of the system between 1-2, stop dropping after the pH is stable, and raise the temperature to 30-40 Aging at ℃ for 6-8h, cooling down to room temperature to obtain polymerized silicic acid solution;
[0042] 3) Add 200g of modified hydrotalcite-like suspension into 100g of polysilicic acid solution dropwise, stir at 1000rpm for 6-8h, then reduce the stirring speed to 50rpm and continue to stir and hydrolyze for 18-24h, then remove the so...
Embodiment 3
[0045] With the hydrotalcite-like material prepared in embodiment 1 and 2 ( figure 1 material shown), modified hydrotalcite ( figure 2 materials shown) and polymeric silicic acid modified hydrotalcite materials ( image 3 Materials shown) polymeric silicic acid (PSA) and ferric sulfate are used as flocculants to evaluate the test effect on neutral chemical wastewater:
[0046] Physical and chemical properties of neutral chemical wastewater (pH=7.0, CODcr=1023mg / L, SS=292mg / L, turbidity 121NTU):
[0047] Test method: Take 200ml of neutral chemical wastewater, add 5.0g of different flocculants at a stirring speed of 250r / min, stir for 2min, then stir for 5min at a stirring speed of 60r / min, and finally let it stand for 20min. The supernatant was tested for turbidity, then stirred for 30 seconds and then mixed to detect the rest of the indicators, the results are shown in Table 1:
[0048] Table 1 Test results of different flocculants
[0049] flocculant COD remo...
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