垃圾焚烧飞灰-矿渣基胶凝体系和固镉研究

本研究以城市垃圾焚烧飞灰、矿渣及脱硫石膏作为胶凝材料，以尾矿砂为骨料制取高性能胶结充填材料对飞灰中的重金属镉进行固化处理。在满足矿山充填要求及环境无害的前提下，探索飞灰-矿渣基胶凝体系制成的充填材料中飞灰的极限掺量、（胶凝材料之间的配比、飞灰-矿渣基胶凝体系的最佳料浆浓度及）矿渣的最佳比表面积，并运用X射线衍射（XRD）对制成的净浆试块进行分析。此研究为解决飞灰中有色金属镉的污染问题提供解决思路和方案，为含镉地下充填体的长期稳定性提供理论参考。

MSWI Fly ash-slag cementing system and cadmium solidification

In this study, municipal solid waste incineration(MSWI) fly ash, slag and desulfurized gypsum were used to make cementing materials, mixed with the tailings to make high performance cementing filling material. Meanwhile, the cementing materials solidified the cadmium in the cementing filling material. The purpose of this study is to investigate the effect of high cadmium MSWI fly ash as part of the slag cementing material or even more which is expected to have a high fly ash component with high performance. The orthogonal test carried out a series of experiments of different gelled material ratio, optimum slurry concentration and optimum specific surface area of slag, evaluated by using the unconfined compressive strength, the leaching concentration of heavy metal ions. This study provides a solution to solve the problem of cadmium pollution in fly ash, and provides a theoretical reference for the long-term stability of the cadmium-bearing underground filling body.