Study on the Pb2+ Consolidation Mechanism of Gangue-Based Cemented Backfill

Coal mining produces a large amount of gangue that pollutes the environment, causing surface subsidence and damaging groundwater systems. Backfill is an effective technology used to solve this problem, but there risk polluting due heavy metal ions present in backfill material. Pb2+ has been determined be representative element because its existence coal samples not fly ash. The gangue-based cemented pollution can evaluated by studying leaching from under various conditions. When comparing amounts particles test blocks, it was found cement filling obvious consolidation effect on gangue. above process shows results theoretical analysis, X-ray, SEM show mechanism divided into four modes: physical encapsulation, ion exchange, adsorption, chemical reaction. are great significance for revealing metals gangue, assessing via gangue-cemented backfill, improving theory protection.