In a groundbreaking study, researchers have unveiled a novel approach to combat soil erosion in open-pit coal mines, particularly in China’s ecologically sensitive northern regions. The combination of chitosan and urease-induced calcium carbonate precipitation (EICP) presents a promising solution to the pressing issues of soil erosion and water loss exacerbated by mining activities.
Zhile Wang, the lead author from the School of Mines at the China University of Mining & Technology, emphasizes the significance of their findings: “Our research demonstrates that by integrating chitosan with EICP, we can significantly enhance the erosion resistance of dump slopes, which is crucial for sustainable mining practices.”
The study meticulously examined various parameters to optimize the mineralization reaction, ultimately determining that a concentration of 1 mol/L for urea and calcium chloride, combined with 5 g/L of chitosan at temperatures not exceeding 60 degrees Celsius, yielded the best results. The researchers prepared three groups of slope samples—control, EICP, and chitosan-targeted EICP—to analyze erosion conditions and surface strength changes. The results were striking: the erosion amounts were reduced by 85.4% and 91.6% for the EICP and chitosan-EICP groups, respectively, while surface strength increased by 9.8% and 14.2%.
Wang elaborates on the mechanism behind this improvement, stating, “Chitosan not only stabilizes urease activity but also facilitates the nucleation sites necessary for EICP, enhancing the production of calcite and improving soil structure.” This innovative approach not only mitigates erosion but also strengthens the soil’s internal bonding, which is vital for maintaining the integrity of mining slopes.
The implications for the mining sector are substantial. As the industry faces increasing scrutiny over environmental impacts, adopting such eco-friendly technologies can help mitigate risks associated with soil erosion while promoting sustainable practices. The research indicates a clear path forward for mining companies to enhance their environmental stewardship, potentially leading to lower operational costs related to erosion control and improved regulatory compliance.
The findings, published in ‘Meitan xuebao’ (Journal of the Coal Industry), provide a valuable reference for the development and engineering application of erosion prevention technologies in open-pit mining. As the industry evolves, the integration of scientific advancements like those from Wang’s research could become standard practice, shaping a future where mining operations coexist more harmoniously with their surrounding environments.
For further information on this innovative research, you can visit lead_author_affiliation.
