Evaluation of Natural Sudanese Sands as Potential Sources for High-Purity Silica (Sio₂)
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The growing global demand for high-purity silica (SiO₂) has encouraged extensive research on the identification and beneficiation of natural silica resources. Silica plays a fundamental role in several industrial sectors including glass manufacturing, electronics, semiconductors, ceramics, solar energy technologies, polymer composites, and chemical catalysis. The objective of this study is to evaluate the potential of natural sand deposits from three Sudanese regions—Bara (North Kordofan), North Omdurman (Khartoum State), and Al-Matamma (River Nile State)—as possible raw materials for high-purity silica production. Representative sand samples were collected from the selected locations and subjected to physical and chemical characterization processes. The experimental methodology included drying, particle size analysis through mechanical sieving, silt content determination, bulk density measurement, alkali fusion treatment using sodium carbonate, acid leaching using hydrochloric acid, and thermal calcination at elevated temperatures. The chemical composition of the treated samples was determined using X-ray fluorescence (XRF) analysis. The results demonstrated significant variations in silica concentration among the studied deposits. The sand collected from Bara exhibited the highest SiO₂ content reaching approximately 96.43%, followed by North Omdurman with 94.84% and Al-Matamma with 92.42%. The purification process effectively reduced impurity levels, particularly iron oxides and alumina. These findings indicate that Bara sand deposits represent a promising raw material for the development of local silica-based industries in Sudan. The study highlights the economic and industrial potential of utilizing indigenous silica resources to support national mineral processing industries.
Bakar, R.A., Yahya, R. and Gan, S.N. (2016) Production of high purity amorphous silica from rice husk. Procedia Chemistry, 19, pp.189–195.
Braga, A.F.B., Moreira, S.P., Zampieri, P.R., Bacchin, J.M.G. and Mei, P.R. (2008) New processes for the production of solar-grade polycrystalline silicon: A review. Solar Energy Materials and Solar Cells, 92(4), pp.418–424.
Cheng, Y., Li, H., Wang, Y. and Zhang, L. (2018) The effect of calcination temperature on the structure and activity of TiO₂/SiO₂ composite catalysts derived from titanium sulfate and fly ash acid sludge. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 554, pp.210–218.
Eddy, D.R., Puri, F.N. and Noviyanti, A.R. (2015) Synthesis and photocatalytic activity of silica-based sand quartz as the supporting TiO₂ photocatalyst. Procedia Chemistry, 17, pp.55–63.
Fardhyanti, D.S., Sari, T., Susanto, H. and Widiyastuti, W. (2018) Synthesis of silica powder from sugarcane bagasse ash and its application as adsorbent in adsorptive distillation of ethanol-water solution. MATEC Web of Conferences, 237.
Gaber, M.A., El-Sayed, M.M., Hassan, M.M. and Ibrahim, H.A. (2024) Upgrading of silica sand using chemical leaching process for industrial applications at Wadi El-Dakhal area, Egypt. Egyptian Journal of Petroleum, 33(4), pp.455–463.
Gödeke, S.H., Suhip, M.A.A. and Jaya, A.A. (2025) Characterization of high-purity silica sand deposits from Brunei for industrial applications. Minerals Engineering, 198, pp.108–118.
Islam, M.R., Biswas, P.K. and Ismail, A.B.M. (2024) Microwave oven assisted synthesis of silica powder from river sand. Journal of Materials and Environmental Science, 15(9), pp.1321–1330.
Kamila, N.S., Syah, A.A. and Wijaya, A.R. (2024) Development of calcium–alginate–silica membrane for adsorption and water purification applications. Journal of Environmental Chemical Engineering, 12(1), pp.102–110
Li, J., Zhang, H., Liu, Y. and Chen, W. (2022) A green and low-cost purification route for silica extraction from natural sand. Materials Science Forum, 1045, pp.120–128.
Meftah, N., Hani, A. and Merdas, A. (2023) Eco-friendly synthesis of high purity silica nanoparticles from desert sand. Materials Chemistry and Physics, 296, pp.127–135.
Munasir, M., Triwikantoro, T., Zainuri, M. and Darminto, D. (2013) Synthesis of silica nanopowder produced from Indonesian natural sand via alkali-fusion route. AIP Conference Proceedings, 1555(1), pp.28–31.
Raghavan, P., Suresh, N. and Ramasamy, P. (2006) Development of a beneficiation flow sheet for processing silica sand from Chertala area of Kerala. Proceedings of the International Seminar on Mineral Processing Technology, pp.123–130.
Rahayu, E.S., Prasetyoko, D. and Bahruji, H. (2018) Kaolin as a source of silica and alumina for synthesis of zeolite Y and amorphous silica–alumina. MATEC Web of Conferences, 156.
Saha, A., Roy, P., Das, S. and Banerjee, S. (2024) Greening the pathways: A comprehensive review of sustainable synthesis strategies for silica nanoparticles and their diverse applications. RSC Advances, 14(16), pp.11024–11045.
