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Application of polyaluminium chloride in water treatment

Polyaluminum chloride is a new water purification material, inorganic polymer coagulant, poly aluminum chloride, PAC(Poly aluminum chloride), it is between AlCI3 and Al(OH)3, a water-soluble inorganic polymer, The chemical general formula is [Al2(OH) Ncl6-NLM], where M represents the degree of polymerization and N represents the degree of neutrality of PAC products. In m product, n=1-5 is a high charge polymeric ring chain with Keggin structure, which has high electrical neutralization and bridging effect on colloid and particulate matter in water, and can remove microtoxic and heavy metal ions with strong strength, and has stable properties. Inspection method can be in accordance with the international GB 15892-2003 standard inspection. Due to the bridging action of hydroxide ions and polymerization of polyvalent anions, polyaluminum chloride is an inorganic polymer water treatment agent with higher relative molecular weight and charge.

Application of polyaluminium chloride in water treatment


Polyaluminum chloride is a new water purification material, inorganic polymer coagulant, poly aluminum chloride, PAC(Poly aluminum chloride), it is between AlCI3 and Al(OH)3, a water-soluble inorganic polymer, The chemical general formula is [Al2(OH) Ncl6-NLM], where M represents the degree of polymerization and N represents the degree of neutrality of PAC products. In m product, n=1-5 is a high charge polymeric ring chain with Keggin structure, which has high electrical neutralization and bridging effect on colloid and particulate matter in water, and can remove microtoxic and heavy metal ions with strong strength, and has stable properties. Inspection method can be in accordance with the international GB 15892-2003 standard inspection. Due to the bridging action of hydroxide ions and polymerization of polyvalent anions, polyaluminum chloride is an inorganic polymer water treatment agent with higher relative molecular weight and charge.


Physical and chemical properties of polyaluminum chloride: polyaluminum chloride has adsorption, condensation, precipitation and other properties, its poor stability, erosion, such as carelessly splashed on the skin to immediately clean with water. Production personnel to wear work clothes, masks, gloves, wear rubber boots. Polyaluminum chloride has many advantages, such as good stability of spray drying, wide water area, fast hydrolysis speed, strong adsorption capacity, large alum flower formation, dense quality and fast precipitation, low turbidity of effluent water and good dehydration performance. Spray drying products can ensure safety, reduce water accidents, super safe and reliable drinking water for residents. Therefore, polyaluminium chloride, also referred to as high efficiency polyaluminium chloride, high efficiency PAC or high efficiency grade spray drying polyaluminium chloride. Polyaluminum chloride is suitable for all kinds of turbidity of raw water, pH range is wide, but compared with polyacrylamide, its settlement effect is far worse than polyacrylamide.


The basicity of polyaluminum chloride is a relatively important index of polyaluminum, especially for drinking water grade polyaluminum products. The lower the base degree of salt, the higher its price, each purchaser can operate according to the actual situation of the manufacturer. In addition, the basicity of polyaluminum chloride products produced and disposed of by different raw materials and different processes is also different, which requires manufacturers to adjust. The economic benefit of production and utilization can be greatly improved by increasing the basicity of polyaluminium chloride products. The basic degree of salt increases from 65% to 92%, the cost of raw materials can be reduced by 20%, and the cost of utilization can be reduced by 40%.

Polyaluminum chloride concentration ratio: when solid polyaluminum chloride is diluted into liquid, the first thing is to do in accordance with the raw water situation, before using the most correct dosage. When polyaluminum chloride is used in production, it can be dissolved by mixing polyaluminum chloride solid: water =1:9-1:15 mass ratio. The solution with alumina content less than 1% is easy to hydrolyze, which will reduce the utilization efficiency, and the concentration is too high to add evenly. After the drug is put into use, if you see less alum flowers and large residual turbidity in the sedimentation tank, then the dosage is too little; If you see the sedimentation tank alum flower is large and upturned, then the dosage is too large, should be adjusted appropriately.

Because white polyaluminium chloride, polyaluminium chloride is called high purity iron white polyaluminium chloride, polyaluminium chloride or food grade white, compared with his polyaluminium chloride is of the highest quality product, all raw materials are high quality aluminum hydroxide powder, hydrochloric acid, adopt the production process of spray drying method is the most advanced technology. White polyaluminum chloride used in paper sizing agent, sugar decolorization clarifying agent, tanning leather, medicine, cosmetics and careful casting and water treatment and other fields.

Yellow polyaluminum chloride: yellow polyaluminum chloride raw materials are calcium aluminate powder, hydrochloric acid, bauxite, it is important for sewage treatment and drinking water treatment, for drinking water treatment of raw materials is aluminum hydroxide powder, hydrochloric acid, and a small amount of calcium aluminate powder, the process is plate frame pressure filtration process or spray drying process. On the disposal of drinking water, the country has strict requirements on heavy metals, so whether it is raw material or production process is better than brown polyaluminum chloride. Yellow polyaluminum chloride, like adopting drum drying production or spray tower drying production, has flake, powdery two kinds of solid form.

Characteristics of polyaluminum chloride: PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC PAC Compared with drum drying polyaluminium chloride, the product input of spray drying can be reduced by half, which not only reduces the labor intensity of workers, but also reduces the water production cost of users. In addition, spray drying products can ensure safety, reduce water accidents, super safe and reliable drinking water for residents.

Polyaluminium chloride, high efficiency polyaluminium chloride, or high efficiency PAC. Adopt the current most advanced production technology, the use of high efficiency of high quality raw materials reflect polymerization. Production is carried out in accordance with gb GB15892-2020. Polyaluminium chloride is processed by spray drying process. Therefore, it can also be called high efficiency grade spray drying polyaluminum chloride.

Production process of polyaluminum chloride: there are many synthetic ways of polyaluminum chloride, according to the different raw materials, can be divided into metal aluminum method, active aluminum hydroxide method, aluminum oxide method, aluminum chloride method, alkali solution method, etc.. ① Metal aluminum method. The raw materials for the synthesis of polyaluminum chloride by metal aluminum method are the scraps of aluminum processing, such as aluminum chips, aluminum ash and aluminum slag. The liquid polyaluminum chloride was prepared by slowly adding hydrochloric acid into aluminum ash according to certain ratio under stirring, curing, polymerization and sedimentation, and then by dilution, filtration, concentration and drying. It can be divided into acid method, alkali method and neutralization method. If the acid method is mainly HCl, the product quality is not easy to control; Alkali production process is difficult, large equipment investment and large amount of alkali, pH value control cost of raw materials, high cost; The most used method is neutralization, as long as the control of a good ratio, the same can reach the national standard. ② Aluminum hydroxide method. The purity of aluminum hydroxide powder is relatively high, and the content of toxic substances such as heavy metal polyaluminum chloride is low. This process is relatively simple, but the production of polyaluminum chloride basicity is low, so the same adoption of aluminum hydroxide heating pressure acid solution plus calcium aluminate powder neutralization two processes. ③ Trialumina method. The raw materials containing aluminum oxide are bauxite, aluminum vanadium soil, kaolin, gangue and so on. The production process can be divided into two steps: the first step is to obtain crystalline aluminum chloride, the second step is to obtain polyaluminum chloride by pyrolysis or neutralization method. ④ Aluminum chloride method. Using aluminum chloride powder as raw material, polyaluminum chloride is processed. This is the most common. It can be prepared by boiling pyrolysis of crystalline aluminum chloride at 170℃, and then curing and drying. ⑤ Alkali solution method. Aluminum ash was first reflected with sodium hydroxide to obtain sodium aluminate solution, and then hydrochloric acid was used to adjust pH value to get polyaluminum chloride solution. In this way, the product has better color and appearance, less insoluble matter, but the content of sodium chloride is high, the consumption of raw materials is high, the content of alumina in solution is low, and the cost of industrial production is large.

Composition of polyaluminium chloride: if the main aluminum oxide, namely alumina, molecular formula: [Al2(OH) NCl6-N •xH2O] M (M ≤10, n= 1-5) is a high charge polymeric chain with Keggin structure. It has high electrical neutralization and bridging effect on colloid and particulate matter in water, and can strongly remove microtoxic and heavy metal ions, and has stable properties. Inspection method: according to the international GB15892-2003 standard inspection. Also known as basic aluminum chloride, polyaluminum chloride referred to as PAC, also known as polyaluminum chloride, composite polyaluminum chloride, basic aluminum chloride

Basicity of polyaluminum chloride: the basicity of polyaluminum chloride is a relatively important index in polyaluminum, specially for drinking water grade polyaluminum products, this standard is one of the important indicators of polyaluminum production line control production. The lower the base degree of salt, the higher its price, each purchaser can operate according to the actual situation of the factory. In addition, the basicity of polyaluminum chloride products produced and disposed of by different raw materials and different processes is also different, which requires manufacturers to adjust. The economic benefit of production and utilization can be greatly improved by increasing the basicity of polyaluminium chloride products. The basic degree of salt increases from 65% to 92%, the cost of raw materials can be reduced by 20%, and the cost of utilization can be reduced by 40%

Packaging: plastic woven bag for external use, plastic film set, each bag net weight of 25kg, can also be modified according to user requirements, and liquid poly aluminum chloride sales. It is forbidden to mix, transport and storage with toxic substances. The product should be stored indoors in a dry, ventilated and cool place without dampness. Caution should be taken when loading and unloading, and solid products should be stored for one year.

The application of polyaluminum chloride: water purification treatment: domestic water, industrial water; ⒉ Urban sewage treatment; C. Disposal of industrial waste water, sewage and sludge and recovery of some slag in sewage, etc.; 4. For some industrial sewage which is difficult to deal with, PAC is adopted as the host, and other agents are mixed into compound PAC. The treatment of sewage can achieve surprising results.


The role of polyaluminium chloride in water treatment is described in detail

Net weight: 25 kg

Transportation: motor transportation


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