Yue Qinyan

Impact factors and thermodynamic characteristics of aquatic humic acid loaded onto kaolin

The adsorption of humic acid (HA) on kaolin particles was studied at various conditions of initial solution pH, ionic strength and solid-to-liquid ratio. The resulting affinity of interactions between humic acid and kaolin was attributed to the surface coordination of HA in ambient suspensions of mineral particles and the strong electrostatic force at low pH. Addition of inorganic salt can also influence the adsorption behavior by affecting the HA molecular structure, the clay particle zeta potential and so on. Equilibrium data were well fitted by the Freundlich model and implied the occurrence of multilayer adsorption in the process. In addition, the enthalpy dependent of system temperature was 79.17 kJ/mol, which proved that the mechanism of HA adsorption onto kaolin was comprehensive, including electrostatic attraction, ligand complexation and hydrogen bonding.

Experimental Study on Median Temperature Sulfur Fixation Characteristics and Mechanism in Flue Gas of Alkaliferous Industry Waste

The median temperature sulfur fixation characteristics in flue gas of experimental wastes were studied by Tube Furnace, the phase composition and mineral content of sulfur fixation product were analyzed by XRD and thermal gravimetric, median-temperature sulfur fixation mechanism of alkali industrial waste were discussed, which provide theoretical basis for preparation of waste type median-temperature sulfur fixation agents. It can be found that some experiments alkali industrial waste such as: alkali slag, red mud and salt slurry have better sulfur fixation characteristics because of rich in Al2O3, Fe2O3 and SiO2, and so on, On the one hand, Al2O3, SiO2 and Fe2O3 make initial grain size of carbonate crystallization small and dispersion high, which can increase surface area of sulfur fixation reaction, thin product thickness, reduce diffusion resistance of product layer and raise the proportion of carbonate forming sulfate, on the other hand, Al2O3, SiO2 and Fe2O3 play the role of transferring oxygen during the formation process of CaSO4, which result in CaSO3 is easily oxidized and form sulfate calcium.