What color is polyaluminum chloride（pac）
Release time: 2025-08-18
I. PAC color classification and corresponding levels
The color difference of PAC directly reflects its purity level and core components, which are mainly divided into four levels:
Color categories | Level definitions | Key characteristics |
white PAC | Food/drug grade | The purity is the highest (Al₂O₃≥30%), and there is no residual iron ion |
popcorn PAC | Drinking water treatment grade | The heavy metal content is strictly controlled, in line with GB15892-2020 standard |
auratus PAC | General grade for industrial wastewater | High cost performance, strong flocculation capacity and fast sedimentation speed |
Dark-colored PAC (Brown/ocher/ochre) | Special grade with low temperature and high turbidity | High iron content, adapt to low temperature and low turbidity environment |
2. In-depth analysis of production process and application scenarios
1. White PAC: high purity and fine field dedicated
- production engineering ：
- Spray drying method was used to form high purity aluminum hydroxide powder at high temperature.
- applicable scene ：
- ✅ Purification of water for food processing (e.g. beverages, dairy products)
- ✅ Pharmaceutical preparation pure water system
- ✅ Cleaning of precision instruments and refining of cosmetic raw materials.
2. Pale yellow PAC: core guarantee of drinking water safety
- production engineering ：
- Plate and frame filter press process or spray drying method, strict control of heavy metal residue.
- applicable scene ：
- ✅ Raw water purification of waterworks (removing turbidity and heavy metals)
- ✅ Recycled water treatment system
- ✅ Scenarios with high requirements for water clarity.
3. Golden yellow PAC: the main force of industrial wastewater treatment
- production engineering ：
- The drum drying method uses calcium aluminate powder and bauxite as raw materials, which has low cost and high yield.
- applicable scene ：
- ✅ High pollution industrial wastewater (decolorization of printing and dyeing wastewater, heavy metal precipitation of electroplating wastewater)
- ✅ Primary treatment of municipal sewage treatment plant
- ✅ Sedimentation of coal washing wastewater and scale prevention of circulating cooling water.
4. Dark PAC: customized solution for special water bodies
- production engineering ：
- Iron reinforced drum drying method, adding iron powder to improve the iron content, enhance low temperature activity.
- applicable scene ：
- ✅ Northern winter low temperature sewage treatment (effective below-5℃)
- ✅ Algae removal from high algal water bodies of lakes and reservoirs (e.g., blue algae outbreak period)
- ✅ Pretreatment of industrial water with high iron impurities.
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