Combined PAM & PAC Treatment for Steel Plant WW

Combination treatment of steel plant wastewater with polyaluminum chloride and anionic polyacrylamide
The combination of polyaluminum chloride and anionic polyacrylamide is used to treat wastewater from steel mills. The wastewater from steel mills can be mainly divided into indirect cooling water for equipment, direct cooling water for equipment and products, and production process wastewater. According to different steelmaking production processes, such as using combustion method and unburned method, the wastewater discharged during the production process also varies greatly. In addition, one of the production characteristics of steelmaking is intermittent production, so the composition and properties of wastewater change with the smelting cycle.
The main wastewater from steelmaking plants is purified wastewater from oxygen top blown converter flue gas, commonly referred to as converter dust removal wastewater. The treatment of converter dust removal wastewater in steel mills should focus on solving the problems of suspended solids metallurgy, temperature balance, and water quality stability. The coagulation and sedimentation treatment process for suspended solids is as follows: before the dust removal wastewater enters the sedimentation tank, it first passes through coarse particle separation equipment (such as hydraulic cyclones or spiral classifiers), uses the principle of gravity to remove suspended impurities of large particles, and then enters the sedimentation tank. Add pH adjuster and polymer flocculant to the sedimentation tank to achieve the co flocculation and sedimentation of suspended solids and scaling substances. Then, add scale inhibitor to the effluent of the sedimentation tank. In this way, both the clarification problem of wastewater and the water stability problem are solved, thus achieving a better treatment effect. Add polyaluminum chloride PAC to wastewater, and the polymer will coagulate suspended solids in the water into small flocs; When anionic APAM is added to wastewater, it forms larger flocs with stronger binding force through various bonding interactions, causing them to precipitate. A large number of laboratories and practices have proven that the compound addition of polyaluminum chloride PAC and anionic APAM has the best effect.     ---B