How polyaluminium chloride plays a big role

2021-12-20

Whether the polyaluminium chloride can play a good use effect depends not only on the quality of the polyaluminium chloride products, but also on the correct use method. Today we will introduce the considerations of dissolving polymeric aluminum chloride before use.

Polyaluminium chloride needs to be tested in the laboratory before most of its use. The dosage is calculated based on experimental data, and then polyaluminium chloride is configured as a dosage solution.

When preparing polyaluminium chloride solution, it is usually necessary to dissolve the polymeric aluminium chloride first, and then configure it according to actual needs. In general, the polyaluminium chloride can be directly dissolved with tap water and cannot be configured with water with obvious pollution. In most cases, it can be kept at room temperature, i.e. 20°C. When dissolving polyaluminium chloride, a corresponding stirring device should be added to speed up the dissolution of polyaluminium chloride.

When preparing polyaluminium chloride solution, the configuration needs to be based on small-scale test data. Usually, we configure the aqueous solution to a concentration of 2% to 5% and then perform the actual dosing. Usually, we choose a suitable dosing pump to pump the polymeric aluminum chloride solution into the wastewater for mixing reaction.

After adding the polyaluminium chloride to the wastewater, the effect of the reaction flocculation needs to be observed at all times. If the flocculation and precipitation effect is poor, the pump dosage needs to be increased. If the alum is cut and floating, the pump dosage of polyaluminium chloride needs to be reduced.

Polyaluminium chloride is a water-soluble inorganic polymer between AlCl3 and Al(OH)3. The general chemical formula is [Al2(OH)CL6-], which indicates the degree of polymerization and the neutrality of PAC products = 1~5. It is a highly charged polymer ring chain with Keggin structure, which has high electric neutralization and bridging effect on colloids and particles in water, and can remove trace toxic substances and heavy metal ions with stable performance. This test method can be tested according to international standard GB 15892-2003.

How should polyaluminium chloride be dissolved and used?

1. Polyaluminium chloride PAC is an inorganic polymer compound, which is soluble in water and has a certain degree of corrosiveness;

2. according to the difference of raw water quality, a small test should be conducted before use to obtain the dosage;

3. In order to facilitate accounting, the small-scale test solution is generally prepared in 2~5% by component volume ratio (w/V). If a 3% solution is prepared: weigh 3g of pac, put it into a cleaned 200ml measuring cylinder, add about 50ml of water, dissolve and dilute to 100ml with water, shake well #polymeric aluminum chloride role#;

4. When using, mix the liquid product into 5-10% aqueous solution and the solid product into 3-5% aqueous solution (according to the product composition);

5. When preparing, mix and dissolve according to solid: water = 1:5 (w/V), then add water and dilute to the above concentration;

6. less than 1% of the solution is easy to hydrolyze, reducing the effect of use; if the concentration is too high, it is easy to form waste and not easy to control the amount;

7. Pay attention to the investigation and adjustment during operation. If there is less alum in the sedimentation tank and the remaining turbidity is larger, the dosage is too small; if the alum in the sedimentation tank is larger and overturned and the residual turbidity is higher, the dosage is too large and should be properly adjusted.

8. Dosing facilities should be anti-corrosion.

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How polyaluminium chloride plays a big role

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