High purity polyaluminum chloride (referred to as polyaluminum), also known as basic aluminum chloride; Polychlorinated aluminum; Hydroxylaluminum chloride; PAC, etc., appearance: white, golden yellow, yellow brown, reddish brown granular/flaky; CAS NO: 1327-41-9.
The color is yellow or light yellow, dark brown, or dark gray resin like solid. This product has strong bridging adsorption performance, and during the hydrolysis process, physical and chemical processes such as coagulation, adsorption, and precipitation occur. The fundamental difference between polyaluminum chloride and traditional inorganic coagulants lies in the fact that traditional inorganic coagulants are low molecular crystalline salts, while polyaluminum chloride's structure is composed of a variety of multi-carboxyl complexes, with fast flocculation and precipitation speed, a wide range of applicable pH values, no corrosiveness to pipeline equipment, and obvious water purification effect. It can effectively remove heavy metal ions such as SS, COD, BOD, arsenic, mercury, etc. in water. This product is widely used in drinking water Industrial water and sewage treatment fields.
High purity polyaluminum chloride is composed of a series of inorganic polymer compounds with different degrees of polymerization, and has the best morphology distribution. The main component is AL13O4OH24 (H2O) 24 (H2O) 127+, which is a high charge polymerized cyclic structure with KEGGIN structure. It has a high degree of charge neutralization bridging function for colloids and particles in water, and can effectively remove micro organic toxins and heavy metal ions. Its characteristics are stable. In water, the negative charge carried by the colloidal particles instantly neutralizes the colloid, causing it to destabilize. The colloidal particles quickly coagulate and further bridge to form large flocs, leading to rapid precipitation.
Compared with traditional inorganic coagulants, high-purity polyaluminum chloride has the following advantages:
1. High purity, low iron content, suitable for papermaking and cosmetics production.
2. The formation of flocs is fast, sedimentation is rapid, and the processing capacity is greater than that of traditional products.
3. The appearance of the product is white, with uniform particles and good fluidity.
4. The product aqueous solution has low turbidity and good stability.
5. The applicable pH range is wide, and it can be used in the range of 5.0-9.0.
6. The minimum residual dissolved salt is beneficial for ion exchange treatment and high-purity water production.
7. Strong adaptability to changes in turbidity, alkalinity, and organic matter content.
8. Good flocculation effect can be maintained for low temperature and low turbidity water quality.
9. The residual free aluminum content is low, and the purified water quality meets the national standard requirements;
10. Low corrosiveness, easy dissolution of powder, superior to other similar products.
The high-purity white high-purity polyaluminum chloride (PAC) is a new and efficient inorganic polymer coagulant. This product is made of pure raw materials (aluminum hydroxide, synthetic hydrochloric acid) with advanced technology, and has good flocculation effect. Its water purification effect is better than the traditional ordinary inorganic salt coagulants such as aluminum sulfate and iron salt, and the general polyaluminum chloride. The solid product uses spray drying technology, with iron content below 100PPm, Widely used for purification treatment of water supply and industrial water, for papermaking sizing and compounding production of industrial paper additives, for cosmetics production, etc., it is currently the highest purity polyaluminum chloride product domestically and internationally.
The flocculation effect of polyaluminum chloride is shown as follows:
a. The strong electroneutralization effect of colloidal substances in water.
b. The excellent bridging adsorption effect of hydrolysis products on suspended solids in water.
c. Selective adsorption of soluble substances.
Polyaluminum chloride is an inorganic polymer coagulant, which is produced due to the bridging effect of hydroxide ions and the polymerization effect of multivalent anions. The characteristics of inorganic polymer water treatment agents with high molecular weight and charge are mainly determined by the working principle of pressure atomizers, making this drying system have its own characteristics. Since the products obtained by pressure spray drying are porous particles or hollow particles, pressure spray drying and anionic polyacrylamide are mostly used to obtain granular products, and the granular products obtained have excellent dust prevention performance and flow performance.
PERFORMANCE
a. The purified water quality is better than aluminum sulfate flocculant, and the cost of water purification is 15-30% lower compared to it.
b. The formation of flocs is fast, the settling speed is fast, and the processing capacity is greater than traditional products such as aluminum sulfate.
c. The alkalinity of the water consumed is lower than that of various inorganic flocculants, so it is possible to not add or reduce the use of alkaline agents.
d. Suitable source water with a pH range of 5.0-9.0 can coagulate.
e. Low corrosiveness, good operating conditions.
f. The solubility is better than aluminum sulfate.
g. Treating water with less increase in salt content is beneficial for ion exchange treatment and high-purity water production.
h. The adaptability to source water temperature is better than inorganic flocculants such as aluminum sulfate.
MORPHOLOGICAL CLASSIFICATION
a. The undeveloped form of liquid polyaluminum chloride has the advantages of not needing dilution, convenient loading and unloading, and relatively cheap price. The disadvantage is that transportation requires tank trucks, which increases the unit transportation cost (each ton of solid is equivalent to 2-3 tons of liquid)
b. The dried form of solid polyaluminum chloride has the advantage of convenient transportation and does not require tank trucks. The disadvantage is that it also needs to be diluted during use, which increases working intensity
PPROCESS CLASSIFICATION
a. Drum type polyaluminum chloride has a general aluminum content and high water insoluble substances, and is mostly used for sewage treatment.
b. Plate and frame type polyaluminum chloride has a high content of aluminum and low water insoluble substances, and is used for sewage treatment and drinking water treatment.
c. Spray drying polyaluminium chloride has high aluminum content, low water insoluble matter and fast dissolution rate. It is used for drinking water and higher standard water treatment.