The main characteristics of metallurgical wastewater are large amount of water, various kinds and complex and changeable water quality. According to the source and characteristics of wastewater, it mainly includes cooling water, pickling wastewater, washing wastewater (dust removal, gas or flue gas), slag washing wastewater, coking wastewater and wastewater condensed, separated or overflowed during production.

   The development trend of metallurgical wastewater treatment is as follows:

   (1) Develop and adopt new processes and technologies that do not use water or use less water and do not pollute or pollute less, such as dry coke quenching, coking coal preheating, direct desulfurization and decyanation from coke oven gas, etc;

   (2) Develop comprehensive utilization technologies, such as recycling useful materials and heat energy from waste water and gas, and reducing the loss of materials and fuel;

   (3) According to different water quality requirements, comprehensive balance, cross flow use, and improve water quality stability measures, and constantly improve the water recycling rate;

   (4) Develop new treatment process and technology suitable for the characteristics of Metallurgical Wastewater, such as magnetic treatment of iron and steel wastewater, which has the advantages of high efficiency, less land occupation, convenient operation and management, etc