Scope of Application

Drinking water grade spray-dried poly aluminum chloride is usually used to treat turbid water, high-turbidity water, and organic-containing water bodies. It can quickly purify water quality, improve water transparency, effectively remove odors and chroma, and enhance water treatment efficiency. It has important application value in sewage treatment plants, water supply plants, and industrial production.

Product Properties

• Appearance: Light yellow powder
• Aluminum Oxide (Al₂O₃) Content: ≥29.5%
• Basicity: 50%-85%
• pH Value: 3-5 (1% aqueous solution)
• Heavy Metals: Arsenic (As) ≤0.0005%, Lead (Pb) ≤0.001%, Cadmium (Cd) ≤0.0005%, Hexavalent Chromium (Cr⁶⁺) ≤0.0005%, Mercury (Hg) ≤0.00001%

Characteristics & Performance

Drinking water grade spray-dried poly aluminum chloride has the following characteristics:

1. High-efficiency Flocculation: Spray-dried PAC has fine particles and a larger specific surface area, which can quickly combine with impurities and organic matter in water to form flocs, accelerating the sedimentation rate of suspended solids.
2. Low Residue: The residue of spray-dried PAC in water is low, which will not cause secondary pollution to water quality and meets environmental protection requirements.
3. Good Stability: Spray-dried PAC can maintain stable flocculation effect under different water quality and pH values, with a wide application range.
4. Easy to Use: Spray-dried PAC is commonly available in solid powder form, which is easy to transport, apply, and operate.

Product Description

This product is made from high-purity aluminum hydroxide powder, calcium aluminate powder, and high-purity hydrochloric acid through reaction and spray tower drying, meeting the drinking water standard. During the production process of spray-dried PAC, the nozzle uniformly sprays the mother liquor into the drying tower, ensuring that the Al₂O₃ content is uniform and stable, which is easy to control within the specified index range. This enhances the adsorption capacity of colloidal particles, achieving both coagulation and flocculation effects that cannot be achieved by other drying methods. The basicity (i.e., the degree of polymerization) directly affects the water purification effect. The pressure-type granular spray drying method adopted for spray-dried PAC improves the product's polymerization degree while maintaining the original activity of the mother liquor. Additionally, the basicity can be adjusted in a timely manner according to different water quality conditions.

Dissolution Method

Dissolve the solid product in water at a ratio of 1:3 to form a liquid, then dilute it with 10-30 times of clear water to the required concentration for use. For example, to prepare a 10% concentration PAC solution in a 1-ton chemical dissolving tank: first, fill the tank with 1/3 of clear water, start stirring, then add 100kg of solid PAC, allow it to fully dissolve, continue adding water to the 1-ton mark, and stir uniformly. 

Usage Method

The following are the common usage methods of PAC:

1. Pre-dilution: Usually, mix and dissolve PAC with clear water at a specific ratio to prepare a solution with a concentration of 5%-10%.
2. pH Control: Depending on water quality, PAC can be used in weakly acidic or weakly alkaline environments. The effective pH range is 5-9, and the optimal pH range is 6-8.
3. Dosing the Chemical: Add the diluted PAC solution to the water to be treated in an appropriate manner. The dosage will vary according to the water pollution degree and treatment requirements (a laboratory test should be conducted before dosing to determine the basic dosage, which can then be fine-tuned based on actual conditions).
4. Stirring and Mixing: After dosing the PAC solution, quickly mix it with the water to ensure uniform dispersion of the chemical, allowing full contact with colloids and suspended solids in the water. The rapid mixing time is approximately 10-30 seconds, generally not exceeding 2 minutes.
5. Sedimentation and Separation: Let the mixed water stand for a period of time, usually 30 minutes to 1 hour, to fully achieve solid-liquid separation (to accelerate floc sedimentation, PAC is usually used in combination with Polyacrylamide (PAM)).

Notes

1. Since PAC solution is slightly corrosive, the dissolving tank should adopt anti-corrosion measures or be made of corrosion-resistant materials.
2. PAC from different manufacturers or of different models should not be mixed for use as much as possible.
3. Use normal temperature tap water to dissolve PAC, not sewage.
4. The shelf life of solid PAC is generally 12 months, and it is still usable after absorbing moisture.
5. If the floc sedimentation is slow or turbidity occurs after dosing the PAC solution, check the chemical quality or whether the dosage and dosing ratio are appropriate.

Packaging & Storage

During transportation, solid PAC should be covered to avoid rain and moisture, and the packaging should remain intact with clear labels. The solid product is packaged in 25kg bags, with an inner plastic film and an outer plastic woven bag. The product should be stored in an indoor dry, ventilated, and cool place, avoiding moisture. It is strictly prohibited to store it with flammable, corrosive, or toxic substances.

Q: What are the storage requirements and shelf life for the solid PAC?

A: The product should be stored in a cool, dry, and ventilated indoor area, away from flammable or corrosive materials. Our solid PAC has a shelf life of 12 months. Even if the product absorbs some moisture (becomes damp), it remains effective for water treatment.