Coal washing methods are divided into wet type and dry type processes. The coal-washing wastewater is the effluent discharged in the wet type coal washing process. During this process, water consumption required by each ton of coal ranges from 2m³ to 8m³.

The wastewater produced during this process is likely to remain opaque even if left to stand for several months. A large amount of coal-washing wastewater is discharged without reaching the standard, which results in water pollution, river-channel blockage, and all around ecological damage.

By cooperating with multiple large-sized coal plants, HaiBar has introduced a belt filter press for researching the engineering application of both coal-washing wastewater and slime dehydration. The result shows that the belt filter press for slime dehydration is characterized by state-of-the-art technology, great processing capacity, limpid filtrate, low water content of filter cake, and the closed loop water system for coal washing, among others.

A coal plant in Anhui Province puts to use the “cyclone-slime sedimentation tank-filter press” treatment process. As a result, the sludge produced contains some hard solid particles, which may easily abrade the filter cloth. Considering this sludge characteristic, our company selects the superior-quality and wear-resistant filter cloth. Many manufacturers purchased our product to replace the original chamber filter press or plate-and-frame filter press, after visiting our equipment operation site.

• In June, 2007, Huainan Xieqiao Coal Company in Anhui Province ordered two HTB-2000 series belt filter presses.
• In July, 2008, Huainan Xieqiao Coal Company in Anhui Province purchased two HTB-1500L series belt filter presses.
• In July, 2011, Hangzhou Environmental Protection Academy of China Coal Science Research Institute ordered one HTBH-1000 series belt filter press.
• In February, 2013, one HTE3-1500 series belt filter press was exported to Turkey.