Polyaluminum ferric chloride flocculant and preparation method thereof
A technology of polyaluminum chloride and iron flocculation, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve the problem of poor phosphorus removal effect, poor product stability, and equipment corrosion. It has the advantages of simple structure, fast sedimentation rate and simple preparation method.
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[0020] A kind of preparation method of polyaluminum chloride ferric flocculant of the present invention, the specific implementation method is as follows:
[0021] Step 1, respectively configure 1mol / L AlCl 3 solution, 1mol / L FeCl 3 Solution, 1mol / L NaOH solution;
[0022] Step 2, AlCl configured in step 1 3 solution and the FeCl configured in step 1 3 The solutions are mixed according to a certain ratio to obtain a mixed solution A, stirred on a constant temperature magnetic stirrer, and then slowly added dropwise to the mixed solution A a certain amount of NaOH solution configured in step 1 to obtain a mixed solution B;
[0023] In step 2, mix AlCl in solution A 3 with FeCl 3 The molar ratio is: 3:7~9:1.
[0024] In step 2, the stirring time is 10-20 minutes.
[0025] In step 2, the amount of NaOH substance in mixed solution B and AlCl 3 and FeCl 3 The sum of the amount of substances (n(NaOH):n(AlCl 3 +FeCl 3 )) The proportional relationship is: 1.3:1~2:1.
[002...
Embodiment 1
[0031] Configure 1mol / L AlCl respectively 3 solution, 1mol / L FeCl 3 Solution, 1mol / L NaOH solution, according to AlCl 3 with FeCl 3 Measure 1mol / L of AlCl at a molar ratio of 9:1 3 Solution 90ml and 1mol / L FeCl 3 solution 10ml, and the measured AlCl 3 solution with FeCl 3 The solution was put into a beaker, stirred on a constant temperature magnetic stirrer for 10 minutes, and 200ml of 1mol / L NaOH solution was slowly added dropwise. Then polymerize at room temperature for 4 hours, mature the obtained liquid for 24 hours, heat and concentrate, dry and then grind to obtain polyaluminum ferric chloride. Finally, the detection test of phosphorus removal rate and turbidity removal rate was carried out, and the phosphorus removal rate was 92.5% and the turbidity removal rate was 97.0%.
Embodiment 2
[0033] Configure 1mol / L AlCl respectively 3 solution, 1mol / L FeCl 3 Solution, 1mol / L NaOH solution, according to AlCl 3 with FeCl 3 Measure 1 mol / L AlCl at a molar ratio of 7:3 3 Solution 70ml and 1mol / L FeCl 3 solution 30ml, and the measured AlCl 3 solution with FeCl 3 The solution was put into a beaker, stirred on a constant temperature magnetic stirrer for 20min, and 150ml, 1mol / L NaOH solution was slowly added dropwise. Then polymerize at room temperature for 6 hours and mature the obtained liquid for 36 hours, then heat and concentrate, dry and grind to obtain polyaluminum ferric chloride. Finally, the detection test of phosphorus removal rate and turbidity removal rate was carried out, and the phosphorus removal rate was 90.0% and the turbidity removal rate was 95.0%.
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