School of Materials Science & Engineering, Chang'an University, Xi'an, PR China.
Engineering Research Central of Pavement Materials, Chang'an University, Xi'an, PR China.
Waste Manag Res. 2020 Jan;38(1):27-34. doi: 10.1177/0734242X19883921. Epub 2019 Nov 10.
This research investigated the heavy metal leaching property and cementitious material preparation by treating municipal solid waste incineration fly ash through the molten salt process. The results indicated that the heavy metal thermal evaporation of fly ash in the molten salt was related to molten salt composition, heat treatment temperature and atmosphere. After treatment with sodium chloride molten salts (contains 10-50 wt% calcium chloride) from 900°C to 1000°C for 2 h, the leaching concentrations of lead, cadmium, copper, zinc and other heavy metals in fly ash were decreased more than 90% and they could fully meet with the landfill standard. Moreover, after molten salt treatment, the weight fraction of fly ash was reduced by 50 wt% than the original one, and the fly ash has been changed as a kind of cementitious material, which has excellent cementitious property. The X-ray diffraction result indicated that the main crystal mineral composition of cementitious materials obtained was alite, belite, alinite and calcium sulphate.
本研究通过熔融盐法处理城市生活垃圾焚烧飞灰，考察了重金属的浸出特性和胶凝材料的制备。结果表明，飞灰在熔融盐中的重金属热蒸发与熔融盐组成、热处理温度和气氛有关。用氯化钠熔盐（含 10-50wt%氯化钙）在 900°C 至 1000°C 下处理 2 小时后，飞灰中铅、镉、铜、锌等重金属的浸出浓度降低了 90%以上，完全满足填埋标准。此外，经过熔融盐处理后，飞灰的重量分数比原来减少了 50wt%，并且飞灰已经变成了一种胶凝材料，具有优异的胶凝性能。X 射线衍射结果表明，所得胶凝材料的主要晶体矿物组成是阿利特、贝利特、阿利宁和硫酸钙。
