Study on the synthesis of zeolite from the fly ash from co-firing of sewage sludge and coal
In order to explore the method of mixing municipal sludge with coal-fired power plants and utilizing the fly ash to synthesize zeolite with high value,the adsorption capacity of zeolite synthesized under different conditions using the alkali melting hydrothermal method was studied,and the characterization analysis and mechanical study of the co-firing fly ash and its synthesized zeolite were carried out.The results showed that the synthesized zeolite under the conditions of 10∶1 mass ratio of fly ash to solid NaOH,15 mL mass volume ratio of fly ash to deionized water,and 10∶1 molar ratio of silicon to aluminum had the strongest adsorption ability for Cd and Pb ions in simulated wastewater and was much greater than the original co-combustion fly ash.The unit adsorption capacity increased from 78.56 mg/g and 121.26 mg/g to 199.76 mg/g and 399.78 mg/g,respectively.The micro morphology and mineral composition of the synthesized zeolite have undergone significant changes,with a significant increase in specific surface area and total pore volume,and a more uniform pore size distribution.From the perspective of structural parameters,its physical adsorption ability is far superior to that of co-firing fly ash.
fly ashsewage sludgesynthetic zeoliteadsorptionheavy metal
万方数据
维普
