Study on the Solidification/Stabilization of MSWI Fly Ash by Composite Alkali-Activated Cementitious Materials.

Municipal solid waste incineration (MSWI) fly ash (FA) is a hazardous waste produced during the incineration of municipal solid waste, posing a risk of heavy metal leaching and threatening the environment. Therefore, the harmless treatment of MSWI FA has become a crucial issue in environmental safety treatment. This study utilized blast furnace slag, FA, and MSWI FA to prepare composite alkali-activated cementitious materials for the solidification and stabilization of heavy metals in MSWI FA.

Preparation and application of alkali-activated cementitious materials in solidification/stabilization of chromite ore processing residue.

Chromite ore processing residue (COPR) is a typical hazardous waste, which contains Cr(vi) and poses a great threat to the ecological environment and human health. In this study, solidification/stabilization (S/S) of COPR was carried out by using blast furnace slag (BFS) and fly ash (FA) to prepare alkali-activated cementitious materials (AACM). The influence of different factors (water glass modulus, liquid-solid ratio, alkali-solid content and curing temperature) on compressive strength was investigated by single-factor experiment.

Research on the environmental stability performance of chromite ore processing residue solidified products.

Chromite ore processing residue (COPR) is a hazardous waste because of leachable chromium, especially Cr(vi). Therefore, ascorbic acid (AA) and blast furnace slag (BFS) have been used to detoxify and solidify COPR. On this basis, environmental stability experiments with high temperature and freeze-thaw cycles were carried out to explore the stability performance of a solidified body with 40% COPR.