The cooling water of the rolling mill system is in direct contact with the cooling equipment, and the water quality is poor after use. The main pollutants are suspended matter, ph, waste oil and so on.
Water quality which cannot meet the requirements will affect the effect of roll cooling, even cause the pipe or nozzle plugging. Therefore, it is necessary to add chemical deoiler, sludge filter press and other equipment on the basis of the natural precipitation of the original pool.
After the initial precipitation of the cooling water, it goes through the sewage chemical deoiler, and is pumped to the cold water well after the precipitation, deoiling, and PH value adjustment. After cooling pump to cooling tower cooling, it is sent to cold water well, and sent to rolling mill by circulating water pump.
Requirement of Water quality
- Chloride（milligram-ion/L）≦40
- Sulfate（milligram-ion/L）≦75
- Nitrate（milligram-ion/L）≦3
- Calcium carbonate（milligram-ion/L）≦400
- Suspended solids（milligram-ion/L）≦80
- PH :8-8.5(If PH ＜8, surface color of HSS roll will change to yellow or coppery.)