Chinese Name: Aluminum Chloride Hydrate (Abbreviated as PAC)

Polyaluminum Chloride (PAC),代号PAC. Commonly known as a water treatment agent or coagulant, it is a water-soluble inorganic polymer with a chemical formula of [Al2(OH)nCl6-n]m, where m indicates the degree of polymerization and n denotes the neutralization level of the PAC product.

Yellow or pale yellow, dark brown, or dark gray resinous solids. This product exhibits strong bridging adsorption properties, accompanied by coagulation, adsorption, and precipitation during hydrolysis. The fundamental difference between polyaluminum chloride and traditional inorganic coagulants lies in the fact that traditional inorganic coagulants are low-molecular-weight crystalline salts, whereas the structure of polyaluminum chloride is composed of polymorphic polyacrylic acid complexes. It features rapid flocculation and sedimentation, a wide pH range applicability, non-corrosive to pipelines and equipment, and significant water purification effects. It effectively removes color substances, SS, COD, BOD, and heavy metal ions such as arsenic and mercury from water. This product is widely used in drinking water, industrial water, and wastewater treatment fields.

Alumina Chloride Aggregate Characteristics

Polyaluminum Chloride (PAC) is an inorganic substance, a new type of water purification material, and an inorganic polymer coagulant, commonly referred to as polyaluminum. It is a water-soluble inorganic polymer between AlCl3 and Al(OH)3, with the chemical formula [Al2(OH)nCl6-n]m, where m denotes the degree of polymerization and n indicates the neutralization level of the PAC product. For n=1~5, it forms a highly charged polymer ring chain with a Keggin structure, which has strong electro-neutralizing and bridging effects on colloids and particulates in water, and can effectively remove trace toxins and heavy metal ions, with stable properties. Inspection methods can be conducted according to the international GB 15892–2003 standard. Due to the bridging effect of hydroxide ions and the polymerization effect of polyvalent anions, the produced PAC is an inorganic polymer water treatment agent with a higher molecular weight and charge.

Alumina Chloride Aggregate Properties

a. The purified water quality exceeds that of aluminum sulfate flocculant, with a water purification cost 15-30% lower than that of aluminum sulfate flocculant.

b. Rapid formation of flocs and fast settling velocity, with greater treatment capacity compared to traditional products like aluminum sulfate.

c. The alkalinity in the water consumed is lower than that of various inorganic flocculants, thus alkali can be omitted or used in reduced quantities.

d. Suitable for raw water pH range of 5.0-9.0, all can coagulate.

Low corrosiveness, with good operating conditions.

f. Superior solubility to aluminum sulfate.

g. Low increase in water salinity, beneficial for ion exchange treatment and high-purity water production.

h. Superior adaptability to source water temperature compared to inorganic flocculants such as aluminum sulfate.

Alumina Chloride Applications

1. Urban water supply and purification: River water, reservoir water, groundwater.

2. Industrial water purification.

3. Urban Sewage Treatment.

4. Recovery of useful substances from industrial wastewater and waste sludge, promotion of coal fines sedimentation in coal washing wastewater, and starch recovery in starch manufacturing.

5. Various industrial wastewater treatments: dyeing wastewater, leather wastewater, fluoride-containing wastewater, heavy metal wastewater, oily wastewater, papermaking wastewater, coal washing wastewater, mining wastewater, brewing wastewater, metallurgical wastewater, meat processing wastewater, and sewage treatment.

6. Paper sizing. 7. Sugar liquid refining. 8. Casting molding. 9. Fabric anti-wrinkle treatment. 10. Catalyst carrier. 11. Cement rapid setting.

Alumina Chloride Application Method

Solid products should be dissolved in 1 part water to 3 parts by volume to form a liquid, then diluted with 10-30 times more clean water to achieve the desired concentration before use. The optimal pH for addition is between 3.5 and 5.0, as choosing the optimal pH can maximize the coagulation benefits. The dosage can be adjusted according to the original water turbidity, with a general dosage of 10-20 kg per thousand tons for turbidity levels between 100-500 mg/L. Increase the dosage for higher turbidity levels and reduce it for lower turbidity levels.

For rural use, simply add the treatment agent to a water barrel, stir well, let it settle, and the supernatant is ready for use. Approximately 1 gram of this agent is needed per 50 kilograms. Combining this agent with the company's high molecular weight flocculant yields even better results. You can either dissolve the company's anionic or cationic polyacrylamide with PAC to create a composite flocculant or first add PAC to the treated water to form flocs, followed by the company's anionic polyacrylamide to adsorb and bridge into larger flocs.

Dosage of Aluminum Chlorohydrate in Different Water Qualities:

One, in low turbidity water, dilute the solid polyaluminum chloride product with tap water at a ratio of 1:3 (by weight) and stir until completely dissolved.

In domestic and industrial wastewater treatment, initially add approximately 30g of polyaluminum chloride per ton of wastewater. Subsequently, add the diluted polyacrylamide product. (If the effect is not satisfactory, adjust the dosage of the product accordingly, either by reducing or increasing it.)

III. In the wastewater treatment of paper mills, use a dosage ratio configuration for low-turbidity water. If the effect is not significant, it can be added in moderation.

Four, when the raw water turbidity is between 100-500 mg/L, the dosage is 5-10 mg, which is equivalent to 5-10 kg per thousand tons of water. It is recommended to conduct a small-scale test based on the water quality characteristics prior to use, to determine the optimal value, and then proceed with the dosage.