In wastewater treatment processes, we have all recognised the potent efficacy of polyaluminium chloride products. They demonstrate excellent performance during sewage treatment. However, polyaluminium chloride is a high-molecular-weight inorganic coagulant. Its content varies between 26-30%. Different concentrations result in distinct colours for polyaluminium chloride. Polymerised aluminium chloride is categorised as white, yellow, pale yellow, or brownish-yellow. What distinguishes
white polyaluminium chloride from its yellow counterpart?
White polyaluminium chloride represents a high-purity variant. It is produced through spray-drying aluminium hydroxide with high-purity acid, yielding a pale or milky-white powdered solid. It possesses a relatively high aluminium oxide content. Its basicity is comparatively low at only 50%. In contrast, standard polyaluminium chloride typically exhibits a basicity of 90%. Furthermore, white polyaluminium chloride contains fewer water-insoluble substances. It contains merely 0.3% water-insoluble matter, whereas ordinary yellow polyaluminium chloride may exceed 2%. Furthermore, white polyaluminium chloride exhibits a pure, white colour devoid of any metallic impurities. Upon dissolution, it forms a transparent solution without any colouration. It possesses low iron content and exhibits easy solubility at low temperatures. In contrast, ordinary polyaluminium chloride solutions often appear brownish.
Compared to standard polyaluminium chloride, white polyaluminium chloride boasts several percentage points higher aluminium oxide content. Its heavy metal content is notably low. As a spray-dried polyaluminium chloride, it achieves higher removal rates for heavy metals in water treatment. White polyaluminium chloride is rich in positive charges, effectively promoting flocculation. Its low iron content meets papermaking requirements. Combined with its lower degree of hydrolysis, it delivers excellent results in the papermaking industry, enhancing paper brightness and toughness. White polyaluminium chloride exhibits superior absorbency, forming large flocs rapidly. It possesses exceptional dehydrating properties. When treating wastewater of comparable quality, white polyaluminium chloride requires a lower dosage. Particularly for highly polluted water, white polyaluminium chloride achieves effective water treatment with only half the dosage of standard polyaluminium chloride products. This not only delivers powerful performance but also reduces operational costs. It effectively prevents accidents while ensuring the quality and safety of wastewater treatment.
