Polymeric aluminium chloride is widely used in coal washing wastewater treatment industry for its low price and good effect.

‌Polymeric aluminium chloride is widely used in the field of coal washing wastewater treatment because of its affordable price and remarkable effect.

ü Its powerful water treatment capacity and fast treatment speed make the effluent water quality easily meet the discharge standard. Compared with large-scale water treatment equipment, the price of Polymeric aluminium chloride is more affordable, so it is adopted by many coal washing plants.

ü In practice, most of the coal ash material in the coal washing water can be recovered through Polymeric aluminium chloride treatment, and at the same time, for the mildly polluted water, recycling can also be achieved. This greatly reduces the environmental pressure caused by local industrial wastewater discharge.

When treating coal washing wastewater, polymerised aluminium chloride destabilises and coalesces the particles in the water through compression of the double electric layer.

ü The dosage is a key factor affecting the treatment effect, which not only affects the useful density of the coal slurry agglomerate, particle size and turbidity of the effluent, but also directly affects the treatment effect of coal washing wastewater.

ü With the increase of Polymeric aluminium chloride dosage, the cohesion of coal slurry particles increases, and it is easy to generate high-fold particles, resulting in a decrease in the useful density of coal slurry granulation. The turbidity of the effluent is significantly reduced with the increase of dosage, and when the dosage reaches 2.6mg/L, the turbidity of the effluent tends to stabilise.

At this time, most of the particles in the wastewater have been destabilised and coalesced to achieve the best treatment effect. Then increase the dosage, the treatment effect is limited, and will increase the cost of pharmaceuticals.

Therefore, in the actual project, need to reasonably control the dosage of Polymeric aluminium chloride.