Poly Aluminium Chloride is a type of acidic solution, which is regarded as corrosive when at a higher concentration. It is usually yellow and miscible in water at any concentration, yet dilute solutions will hydrolyze to precipitate Al(OH)3 (Aluminium Hydroxide). Polyaluminium Chloride is made up of polymers that are classified by their basicity and strength (usually in % Al203).
Poly Aluminium Chloride or PAC is a coagulant used for water purification. When you compare PAC to other types of aluminum salts, it is better suited for destabilizing and removing suspended materials, due to its higher charge.
PAC is commonly used in water-purification systems to make sure water is safer for drinking. Similar to other coagulants, Poly Aluminium Chloride extracts dissolved matter present in water in the way of suspending and clumping the matter together. The matter can then be filtered as well as disposed of.
PAC water treatment chemical is mainly used in the purification processes of drinking water and to process sewage water. It is also used in many industrial manufacturing processes including paper-making glue, dying and printing, refining glycerin, precision-casting hardening, separation of water and oil in refineries, producing grease-resistant products, especially for fabrics. PAC is also used in construction to harden concrete, in the cosmetics and beauty industry, and for Big pharma to produce medicines.
How Is Poly Aluminium Chloride Made?
PAC is made up of these components:
- 30 to 40 parts calcium carbonate.
- 70 to 90 parts calcium aluminate.
- 160 to 190 parts hydrochloric acid (20-30%).
- 100 to 121 parts bauxite.
Below is a summary of the production process:
- The bauxite is heated to a temperature of 1200-1500 °C for 30 minutes to 2 hours.
- The bauxite is then crushed and combined with calcium aluminate inside a device known as a reaction kettle.
- 25% to 30% hydrochloric acid is then added to the kettle.
- The mixture is then heated to a temperature of 95-110°C for 1 to 3 hours.
- The mixture is then left to stand for 15 to 24 hours to allow the reaction to occur, which forms Polyaluminium Chloride.
At a temperature of 105°C, the final solution is usually dehydrated and a sample is retrieved for analysis.
The Advantages Of Using PAC
- When in use it produces a lot less sludge.
- Very effective coagulant.
- Requires lower volumes in comparison to alum (in water treatment systems).
- Highly versatile (it has several areas of application).
- Since it has lower corrosivity it is easier to use, transport, and store.
- The flocks that form are easier to filter.
- It is a cheaper product to use in comparison to aluminum sulfate.
- Lowers the basicity present in water.
- Tests conclude that there are less salts present in water that has been treated with Poly Aluminium Chloride.
Poly Aluminium Chloride Grades
PAC is available in various grades with different aluminum concentration degrees (usually between 9.5% and 18%) When choosing the appropriate grade for use, other factors should also be taken into consideration.
Commercial grade PAC products usually have a basification of higher degrees. This degree refers to the concentration of Hydroxyl groups relating to Aluminum Ions. In general, when it comes to PAC usage when the basicity is higher, the efficiency, polymer value, and cationic-charge density are also higher.
Poly Aluminium coagulants are also becoming more popular in portable water-treatment plants. In many situations during the process of post-treatment pH adjustment, it was found that using alkali was found to be irrelevant or unnecessary. This not only has positive effects on the water quality but also offers significant savings when it comes to both maintenance requirements and overall production costs.
Get more details about polyaluminum chloride and some other water treatment chemicals from this website: https://www.watertreatment-chemicals.com/.