Compound flocculant with polymerization ferric chloride and amination polymers based on papermaking sludge and method for preparing compound flocculant
A technology of polyferric chloride and composite flocculant, applied in chemical instruments and methods, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. The problems of narrow range and high operating cost can achieve good coagulation effect, reduce slow stirring and sedimentation time, and high coagulation efficiency.
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[0051] Example 1. Preparation of composite flocculant (PFC-LNF) with different alkalinity
[0052] (1) Weigh 24.1g of FeC1 3 ·6H 2 0 solid and dissolved in deionized water, add Na dropwise 2 CO 3 Solution, control OH - : Fe 3+ The molar ratio of the phosphate is 0.25, 0.5, 1.0, 1.5, and it is completely dissolved under the action of magnetic stirring. After the foam disappears, the stabilizer 1.27g Na is added in the ratio of the phosphorus to iron molar ratio of 0.08 2 HPO 4 ·12H20 powder, continue to stir until it is completely dissolved, and finally dilute with distilled water to make the volume to 500ml to prepare a polyferric chloride solution with a mass concentration of Fe of 10g / L;
[0053] (2) Add 2.0g of papermaking sludge to 50ml of deionized water, add 1mol / L NaOH solution dropwise with stirring, control the pH to 11.5, stir at 200rpm for 20min, and centrifuge the resulting mixture at 10000rpm for 10min, take Pour the supernatant into the reactor and adjust the pH to 7.0...
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[0055] Example 2. Preparation of composite flocculant (PFC-LNF) with different addition amounts of ethylenediamine
[0056] Same as described in Example 1, the difference is that the addition amount of anhydrous sodium carbonate is 2.4g, and the addition amount of ethylenediamine in step (2) is 2ml, 3ml, 4ml, 5ml, that is, different ethylenediamine addition The amount of composite flocculant products.
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[0057] Example 3. Preparation of composite flocculant (PFC-LNF) with different addition amounts of triethylamine
[0058] Same as described in Example 2, except that the addition amount of ethylenediamine is 4ml, and the addition amount of triethylamine in step (2) is 7ml, 8ml, 9ml, and 10ml respectively, that is, a compound with different addition amounts of triethylamine is obtained. Flocculant products.
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