Zibo Dingqi Chemicals Co., Ltd. is one of the most experienced manufacturers and suppliers of 28% polyaluminum chloride in China. Welcome to wholesale high quality 28% polyaluminum chloride made in China here from our factory. For price consultation, contact us.
Raw The difference with white polyaluminum
|
Characteristics |
Yellow polyaluminum (Industrial grade) |
White polyaluminum (high purity) |
|
Color origin of |
Iron impurities residual |
High purity, no iron impurities |
|
Al₂O₃ content |
28%-30% |
29%-31% |
|
Water insoluble matter |
≤0.5% |
≤0.1%-0.3% |
|
Heavy metal limits are |
More relaxed (e.g. As≤0.002%) |
More stringent (e.g. As≤0.0005%) |
|
Application |
Scenarios Industrial sewage, municipal sewage |
Drinking water, precision manufacturing |
Precautions for production and use
- Raw material control: the iron content in bauxite directly affects the color, and raw materials need to be selected according to demand;
- Storage conditions: Avoid wet caking (solid products have strong hygroscopic properties);
- Dosage test: The dosage should be adjusted according to the water quality (excessive may increase the aluminum ion residue in the water).
Material Ratios
Molar Ratio of Al(OH)₃ to HCl
- Theoretical ratio: 1:3 (Al(OH)₃ : HCl). In practice, excess HCl (10%-20%) ensures complete reaction.
Example Ratio:
- Aluminum hydroxide (≥60% purity): 1 ton
- 31% industrial HCl: 2.2-2.5 tons
- Water: Adjust for optimal reaction concentration.
Basicity Adjustment
- The amount of calcium aluminate (or NaOH) per ton of AlCl₃ solution depends on the target basicity (determined empirically).
Empirical Formula:
- Basicity (%)=[OH−]3[Al3+]×100%Basicity (%)=3[Al3+][OH−]×100%
- Adjust alkaline additive dosage to achieve the desired basicity.
Key Considerations
Safety Protocols
- HCl is highly corrosive; use protective equipment and add reagents gradually to avoid splashing.
- Monitor temperature to prevent violent exothermic reactions.
Quality Control
- Test parameters: Basicity (50%-80%), Al₂O₃ content (≥10%), pH (3.5-5.0).
- Liquid PAC density: 1.2-1.25 g/cm³.
Equipment Specifications
- Acid-resistant reactors (e.g., enamel or polypropylene), agitators, pH meters, and filtration systems.
Customization for Applications
- High-basicity PAC: Increase alkaline additives for high-turbidity wastewater treatment.
- Low-basicity PAC: Reduce alkaline additives for low-turbidity water coagulation.
By optimizing raw material ratios and process conditions, PAC products can be tailored for diverse applications, including water treatment, papermaking, and industrial processes.
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