Abstract
The coal gasification process produces a large amount of coal gasification slag (CGS), which accumulates heavy metals from the raw coal. The CGS not only occupies land resources during long-term storage but also poses potential ecological pollution risks. In this study, eight different CGS samples from various regions of China were analyzed to determine their chemical composition and evaluate their environmental risks. Two leaching methods recommended by the Ministry of Ecology and Environment of China were employed to conduct leaching experiments, aiming to assess the hazardous waste level of CGS. The results indicated that the risk index of YL-FS and XJ-CS reached 101.87 and 87.15, respectively, classifying them as medium-risk materials. The remaining samples were categorized as low-risk materials. CGS itself is not classified as hazardous solid waste. The leaching results revealed that the concentration of Be in the leaching solution of NMG-CS and XJ-CS exceeded 0.005 mg/L, placing them in Class II of general industrial solid waste. The remaining samples exhibited minimal leaching toxicity and were classified as Class I general industrial solid waste.
| Original language | English |
|---|---|
| Pages (from-to) | 6713-6724 |
| Number of pages | 12 |
| Journal | Energy Sources, Part A: Recovery, Utilization and Environmental Effects |
| Volume | 46 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2024 |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 7 Affordable and Clean Energy -
SDG 12 Responsible Consumption and Production
Keywords
- Coal gasification slag
- heavy metals
- leaching toxicity
- potential risk assessment
- solid waste
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