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Sulistiyono, E., Handayani, M., Prasetyo, A.B., Irawan, J., Febriana, E., Firdiyono, F., Yustanti, E., Sembiring, S.N., Nugroho, F. and Muslih, E.Y. 2021. Implementation of sulfuric acid leaching for aluminum and iron removal for improvement of low-grade silica from quartz sand of Sukabumi, Indonesia . Eastern-European Journal of Enterprise Technologies. 3, 6 (111) (Jun. 2021), 32–40. DOI:https://doi.org/10.15587/1729-4061.2021.226267.