【摘要】 为减少城市生活垃圾焚烧飞灰（简称飞灰）与电解锰渣中的重金属对环境的危害,考察了利用两者辅以粉煤灰烧制陶粒的可行性。通过单因素实验确定原材料最佳配比以及最宜烧制工艺条件,并对焙烧后陶粒的微观形貌以及重金属浸出浓度进行分析。结果表明:随着飞灰掺量的增加,陶粒的颗粒强度与堆积密度降低,1 h吸水率升高;确定最佳原料配比为飞灰掺量12%、电解锰渣掺量43%、粉煤灰掺量45%;确定最宜烧制工艺条件为预热温度600℃、焙烧温度1140℃。在最佳条件下,烧制陶粒的颗粒强度为769 N,堆积密度为687 kg·m^-3,1 h吸水率为6.44%。通过微观结构观察,陶粒表面致密呈釉化,内部呈现多孔隙结构。陶粒中重金属浸出浓度均低于国家标准。此陶粒的使用可为飞灰与电解锰渣资源化利用提供参考。更多还原

【Abstract】 In order to reduce the harm to the environment from the heavy metals in municipal solid wasteincineration （MSWI） fly ash and electrolytic manganese residues（EMR）, the feasibility of preparing ceramsitewith these two solid wastes, and coal fly ash as an auxiliary one was investigated. The single-factor experimentswere conducted to determine the optimal mixture ratio of raw materials and the most suitable sinteringconditions, and the morphology of ceramsite and its heavy metals leaching were analyzed. The results showedthat with the doping amount increase of MSWI fly ash, granule strength and bulk density of ceramsite decreased,while its 1 h water absorption increased. The optimum mixture ratios of raw materials were 12% of MSWI fly ash,43% of EMR and 45% of coal fly ash. The most suitable sintering conditions were preheating temperature of 600 ℃ and roasting temperature of 1 140 ℃. Under this condition, the prepared ceramsite had a granulestrength of 769 N, bulk density of 687 kg · m^-3, and 1 h water absorption of 6.44%. Through analyzingmicrostructure of ceramsite, a succession glaze layer and internal pore structure appeared, and the leachingconcentrations of heavy metals from ceramsite were lower than the national standard. It was a novel approach toutilize MSWI fly ash and EMR.更多还原