Slurry property of coal water slurry prepared by coking wastewater

Coking wastewater is a typical industrial wastewater with complex composition, serious pollution and difficult treatment. It was used as raw material to prepare coal water slurry. The effects of temperature and coal particle size distribution were studied. The impact was studied by scanning electron microscopy (SEM) and infrared spectroscopy. The results showed that the maximum coal content of coking wastewater was slightly lower than that of deionized water. In a certain temperature range, the apparent viscosity of coking wastewater water coal slurry decreased with the increase of temperature. The higher the concentration, the more obvious the change of viscosity. Fine coal powder has poor slurryability, and when the coarse coal powder accounts for 70%, the slurry concentration is the highest. The results of scanning electron microscopy and infrared spectroscopy showed that the metal ions in the coking wastewater will adsorb on the surface of the coal powder, affect the adsorption of the dispersant to increase the viscosity of the slurry. The use of coal water slurry technology to treat coking wastewater can realize the harmless and resource utilization of coking wastewater through simple process and low cost, and has good economic and environmental benefits. © 2019, Chemical Industry Press. All right reserved.