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.

Pending Publication Date: 2021-01-01
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum-based flocculants are easily affected by coexisting salts, and the effect on phosphorus removal is not good
As for the iron-based flocculant, although it is easy to operate, strong in controllability, strong in demulsification ability, and can effectively remove suspended solids and colloids in water, there are many shortcomings in the application of iron-based flocculants, such as yellowing and The problem of blackening is highly corrosive to equipment, and the residual iron ions have a great impact on water quality and water use. The product has poor stability and is easy to destabilize to produce Fe(OH) 3 precipitation

Method used

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Examples

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preparation example Construction

[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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Abstract

The invention discloses a preparation method of a polyaluminum ferric chloride flocculant. The preparation method comprises the following steps: step 1, respectively preparing a 1mol / L AlCl3 solution,a 1mol / L FeCl3 solution and a 1mol / L NaOH solution; step 2, mixing the AlCl3 solution prepared in the step 1 and the FeCl3 solution prepared in the step 1 according to a certain proportion to obtaina mixed solution A, performing stirring on a constant-temperature magnetic stirrer, and then slowly dropwise adding a certain amount of NaOH solution prepared in the step 1 into the mixed solution A to obtain a mixed solution B; and step 3, polymerizing the mixed solution B obtained in the step 2 at room temperature, performing curing, heating, concentrating, drying, and grinding to obtain the product. The preparation method is simple and convenient, high in energy efficiency and good in economic benefit. The invention also discloses the polyaluminum ferric chloride flocculant prepared by thepreparation method.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment methods, and in particular relates to a polyaluminum ferric chloride flocculant, and also relates to a preparation method of the polyaluminum ferric chloride flocculant. Background technique [0002] With the increasingly serious problem of water pollution, water treatment technology has been highly valued, especially sewage treatment. Due to its complex content, domestic sewage is difficult to treat, so multi-stage treatment is usually required, and finally electrodialysis, adsorption, flocculation and sedimentation are generally used for treatment. The most common current application is the flocculation-sedimentation method. The flocculation sedimentation method can effectively remove various radioactive and toxic substances, and the polymer can separate flocs from water through sedimentation, filtration, centrifugation and other operations. The most commonly used flocculants in f...

Claims

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Application Information

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IPC IPC(8): C02F1/52
CPCC02F1/5236
Inventor 杨敏鸽王俊勃程水林刘松涛思芳姜凤阳
Owner XI'AN POLYTECHNIC UNIVERSITY
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