Polyaluminum chloride is the most common agent in sewage treatment, and its color is divided into yellowish brown, millet yellow, and pure white according to the content of aluminum oxide and different production processes. Among them, the yellowish brown is mostly granular, which is called roller polyaluminum chloride. There are two kinds of millet yellow: granule and powder. The granule becomes the frame polyaluminum chloride, and the powder becomes the spray polyaluminum chloride; it can also be divided into drinking water grade and industrial grade according to other contents. Compared with the other two colors of polyaluminum, pure white polyaluminum chloride has the advantages of fast dissolution rate, low turbidity of aqueous solution and good stability, and is widely used in drinking water treatment, food industry, pharmaceutical industry, etc. Belongs to food grade PAC. Today we will focus on the millet yellow poly and aluminum chloride.
Millet yellow polyaluminum chloride has two forms: particle and powder. How are these two forms formed? This is to mention his production process. The granular polyaluminum chloride of millet yellow is made of PAC mother liquor (bauxite + industrial waste hydrochloric acid + calcium aluminate powder, keep the temperature and stir until the reaction is complete, this is the PAC mother liquor) after the plate and frame pressure filtration, without impurities. The PAC liquid is yellow granular PAC after drum drying, and the content is generally greater than 28%.
The production process of millet-yellow powdered polyaluminum chloride and granular polyaluminum is basically the same, and it is also the PAC mother liquor. After the plate and frame pressure filtration, the impurity-free PAC mother liquor is the finished product dried by the spray tower, and the content is average. greater than 28%.
The above is the production process of polyaluminum chloride 28 content distinguished by color, which can be used as industrial-grade PAC. This is theoretical data, and its actual operation can be adjusted according to the actual situation on site.
