New heat exchanger station was build in the 1750 m³ blast furnace slag pool side in Jinan iron and steel group. Blast furnace washing slag water was raised by slurry pump, then, sented to high-fiber bundles filters. Filtered washing slag water was accessed into the high performence all welded plate heat exchanger, then the heat exchanger water (clean water) was used for heating. The corrosion and block problems in radiator were successful resolved by using plate separated washing slag water from recycled water to ensure the recycled water clean. Short payback period, saving investment, electricity and water, environmental is the feature of this program. It can also improve production efficiency, reduce production costs, social and economic benefits is significant.