Polyaluminum chloride (PAC) is widely used in many applications due to its strong coagulating and flocculating properties. Some of the common applications of PAC include:

Water and wastewater treatment: PAC is used to remove suspended solids, organic matter, and other contaminants from water and wastewater to improve water quality.

Papermaking: PAC is used in the production of paper to improve the retention of fillers and fibers in the paper pulp, resulting in a stronger paper product.

Textile processing: PAC is used in textile processing to remove impurities and improve the brightness and whiteness of the final product.

Oil drilling: PAC is used in oil drilling operations to improve the clarity of drilling fluids and remove solids from the fluid.

Mining: PAC is used in the mining industry to remove suspended solids from process water and improve the clarity of the water.

It's important to note that the specific application of PAC may vary depending on the type and formulation of PAC used, as well as the desired outcome of the treatment process.