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INVESTIGATION OF BY-PRODUCTS FROM ACETYLENE MANUFACTURING FOR ACID MINE DRAINAGE REMEDIATION
Lam, S.-M. and J.-C. Sin. | Mine Water and the Environment 38(4):757-766(2019)

Carbide lime, a byproduct of acetylene manufacturing, was characterized and compared to commercial calcium oxide (CaO) for acid mine drainage (AMD) treatment. Chemical and x-ray diffraction data revealed that the carbide lime was calcium-rich. Morphological analysis indicated it differed from commercial CaO in that it has a layered structure. Physical characterization, including nitrogen adsorption-desorption isotherm, and particle size distribution, demonstrated that the carbide lime had a greater surface area and finer particle size than the commercial CaO. Jar tests evaluated the effect of the carbide lime and CaO loading on actual AMD. The optimum quantity of carbide lime for treating the AMD was 0.4 g/L, which increased the pH and reduced the metal and sulfate concentrations to acceptable levels. The carbide lime showed superior acid-neutralizing and contaminant diminution at all studied loadings. Additionally, an Imhoff cone test confirmed that the sludge produced using carbide lime settled better than that produced using CaO powder. https://link.springer.com/article/10.1007/s10230-019-00640-2



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