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Spray Polymerization in the Production Process of Polyaluminum Chloride

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Industry News

2022-02-09

Spray-dried polyaluminum chloride is produced using a relatively advanced polyaluminum chloride manufacturing process that involves spray granulation. The polyaluminum chloride is dried and atomized into fine particles, making it one of the highest-quality polyaluminum chloride products available today. It appears as a fine powder, ranging in color from milky white to pale yellow. Spray-dried polyaluminum chloride is commonly used in drinking water treatment.

Polyaluminum chloride spray production process:

Liquid material—filter press—spray tower spray drying—finished product.

A polyaluminum chloride solution with a solid content of 40% to 50% is fed into a high-pressure pump. After being pressurized, the solution is atomized by an atomizer in the dryer, dispersing it into tiny droplets. Once the droplets are dried, a granular product is obtained, enabling simultaneous drying and granulation.

Characteristics of spray-polyaluminum chloride:

It boasts advantages such as low alkalinity, excellent stability, broad adaptability to various water bodies, rapid hydrolysis rate, strong adsorption capacity, high alumina yield, fast sedimentation rate, low turbidity in the effluent, good dewatering performance, fine particle size, smooth surface finish, low dosage, low cost, and safety in drinking water treatment.

Use of jet polyaluminum chloride:

Before officially putting water purification agents such as polyaluminum chloride into use, it is essential to conduct small-scale trials using the wastewater to be treated, in order to identify the optimal point with the best purification effect and the lowest dosage. Polyaluminum chloride solutions should be prepared and used fresh at all times, and their dosage should be adjusted appropriately according to different water qualities.

Agricultural and pastoral wastewater is primarily used for on-field animal husbandry, agriculture and pastoral activities, and the processing of agricultural and sideline products. Most of the organic chemical air pollutants in agricultural and pastoral wastewater have relatively high concentrations.

However, due to their poor biochemical capabilities, even some agricultural and pastoral wastewater can have toxic side effects. Such environmental pollution factors can cause significant damage to the natural environment. Therefore, scientific research holds positive and practical significance for the rational planning and regulation of modern agricultural development and ecological conservation in our country.

Agricultural and pastoral wastewater is characterized by high phosphorus levels and a high permanganate index, and can be treated using physical methods.

During the stirring process in the polyaluminum chloride unit, the stirring speed initially increases and then gradually slows down. In the coagulation process of the coagulation system, the coagulant water is thoroughly mixed with the raw water, requiring rapid rotation to ensure swift completion. Based on the mixer’s rotational speed and stirring time, the rotational speed can be set between 150 and 200 revolutions per minute, while the stirring time can be set between 1 and 3 minutes.

The coagulation process involves bringing polyaluminum chloride into contact with colloidal particles in the water, causing them to aggregate and form flocs (alum). As the flocs grow, it is necessary to gradually reduce the stirring intensity or water flow velocity to prevent the formation of excessively large flocs. The stirring speed can be set between 40 rpm and 50 rpm, and the stirring duration should be 15 to 20 minutes.

Add polyaluminum chloride to water and begin rapid stirring. This promotes the uniform dispersion of the coagulant, facilitating its rapid hydrolysis, dissolution, and deflocculation. Rapid stirring allows the polyaluminum chloride to disperse quickly and evenly throughout the water in an instant, preventing uneven distribution of the reagent that could lead to excessively high local concentrations. Such uneven distribution might impair the hydrolysis of the coagulant itself (such as aluminum sulfate) and its interaction with colloids (or impurity particles) in the water.

When forming flocs, the stirring speed and intensity should be rapidly reduced to avoid disrupting the re-expansion of the flocs or even crushing the flocs that have already formed. To enable the flocs generated during rapid stirring to further grow into coarse and dense flocs, slow stirring should be employed to facilitate further solid-liquid separation.

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