The Poly Aluminium Chloride which you dont know (1)

Poly aluminium chloride is a kind of water-soluble inorganic polymer, which is polymerized by high quality raw material reaction.

The basicity of polyaluminium chloride is a relatively important index in polyaluminium, especially for the drinking water grade of polyaluminium products.

Poly aluminium chloride has good stability, good adaptability to water, fast hydrolysis rate, strong adsorption capacity, large amount of alum, fast quality, low turbidity, good dehydration. Under the condition of the same quality, spray type polyaluminium chloride dosage is reduced, especially under the condition of the water quality is bad, spray stype product turnover compared with roller type polyaluminium chloride, can be reduced by half, not only reduce the labor intensity of the workers, but more important is to reduce the user cost on making water.

The color of polyaluminium chloride is usually white, yellow and brown.

White polyaluminium chloride as known as high purity iron or food-grade white polyaluminium chloride, compared with other polyaluminium chloride is of the highest quality products, the main raw material is high quality aluminum hydroxide powder and hydrochloric acid. The production process adopted is spray drying.

The raw materials of yellow polyaluminium chloride are calcium aluminate powder, hydrochloric acid and bauxite. Mainly used in sewage treatment and drinking water treatment, the raw materials used for drinking water treatment are aluminum hydroxide powder, hydrochloric acid, and a small amount of calcium aluminate powder. The process used is plate frame pressure filtration process or spray drying process.

The raw materials of the brown polyaluminium chloride are calcium aluminate powder, hydrochloric acid, bauxite and iron powder. The production process is using the drum drying method, which is mainly used for sewage treatment.

In operation, the purification process of polyaluminium chloride is generally divided into three stages. It is coagulation stage, flocculation stage and subsidence stage respectively. The coagulation stage in the coagulant container and the original water quickly coagulates the microalum flowers in a very short period of time, when the water becomes more turbid. It requires intense turbulence from the current. Then polyaluminium chloride has entered into the phase of flocculation, flocculation stage is a process of alum flowers grow coarsens, requires the appropriate degree of turbulence and adequate residence time (10 ~ 15 min), can be observed in a large amount of alum flowers gathered to late slowly sinking, the formation of a surface layer clearly. When the flocculant is in the subsidence stage, it is the flocculating sedimentation process in the sedimentation tank, which requires the water flow to be slow. In order to improve efficiency generally USES inclined tube or plate settler, a large number of bulky alum flowers inclined tube (plate) wall block and deposit on the bottom, the upper water for clarification, the rest of the small particle size and density of small alum flowers side slowly down, large side continue to collide with each other, the late to residual turbidity basically remain unchanged.