Affiliation: Professor of Materials and Minerals Department of School of Mines, UNational University of Colombia, Medellín, Colombia.

Reseacrh Gate; Mendeley; Academia; Google scholar; Redalyc.

ORCID ID: 0000-0003-3944-9369

Scopus ID: 57191039100

ResearcerID: N-7698-2017

Education:

• Ph.D.: Metallurgy & Materials, Oviedo University, Spain. April 1996. Thesis: Ultramarine Blue Pigment: Process and Product Characterization. Advisor: Prof. Dr. D. José Pedro Sancho Martínez;
• Postdoctoral Research: NUBIOLA. Research and Development Department. Barcelona, Spain. Girardota, Antioquia. July 2000 - October 2001;
• M. Sc. Ambiental Enginnering. Ecological Research Institute. Málaga, Spain. 1995;
• B.S. Mining & Metallurgy Engineering, National University of Colombia- Medellín, July, 1991.

Academic and professional communities:

• Society for Mining, Metallurgy, & Exploration (SME);
• The Minerals, Metals & Materials Society (TMS);
• Society of Mining Professors (SOMP) - The SOMP meeting (from June 30th through July 3rd 2020) and conference is co-hosted by the School of Mines at Universidad Nacional de Colombia and AIMC (Asociación de Profesionales del Sector Minero Colombiano – Colombian mining sector professionals), under the leadership of Prof. Oscar Restrepo;
• Association for Iron & Steel Technology (AIST);
• Red Iberoamericana de Procesos Extractivos Sostenibles (Riprexs).

Current research interests:

Materials and Minerals Department:

• Extractive Metalurgy: Hydrometallrgy, Pirometallurgy;
• Sustainability on mining and metallurgy industry;
• Cements and ceramic materials;
• Inorganic and ceramic pigments;
• Materials characterization.

 Professional experience:

• 2015 to Present – Professor. School of Mines. Materials and Minerals Department Universidad Nacional de Colombia;
• 2002  to  2015 – Associate  Professor.  School of Mines.  Universidad Nacional de Colombia - Medellín;
• 2000 to 2002 – Nubiola Pigments. Medellín – Colombia. Director Research & Development Department. Inorganic Pigments;
• 1997 to 2000 – Assistant Professor School of Mines Universidad Nacional de Colombia - Medellín;
• 1996 to 1997 – Nubiola Pigments. Medellín – Colombia. Research & Development Department. Inorganic Pigments;
• 1992 to 1996 – Universidad de Oviedo, Spain. Doctoral Studies. Ultramarine Blue pigment. Materials Science & Metallurgical Engineering Department;
• 1991 to 1992 – Nubiola Pigments. Medellín – Colombia. Research & Development Department. Inorganic Pigments.

Chapter of books:

English:

• Colorado H. A., Nino J. C., Restrepo O. Applications and Opportunities of Nanomaterials in Construction and Infrastructure. In: Li B. et al. (eds) Characterization of Minerals, Metals, and Materials 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham., 2018, DOI: 10.1007/978-3-319-72484-3_46;
• Restrepo J., Restrepo O., Jorge Tobón. Reduction of CO2 emissions by chemical synthesis processes in the cement industry. In: Energy Technology 2016: Carbon Dioxide Management and Other Technologies. Edited by Li Li, Donna Post Guillen, Neale Neelameggham, Lei Zhang, Jingxi Zhu, Xuan Liu, Soumendra Basu, Nawshad Haque, Tao Wang, Dirk Verhulst, Amit Pandey. The Minerals, Metals & Materials Series. Springer, Cham., 2016, DOI: 10.1007/978-3-319-481821.

Spanish: Restrepo Baena O. J. Srinivasa Aiyangar Ramanujan. Capítulo del libro Grandes pensadores de fin de milenio. Matemáticos, Físicos y Químicos. Medellín Universidad Nacional de Colombia, 2003. 193-216. 

The main publications:

• Velásquez J. R., Schwartz M., Phipps L. M., Restrepo-Baena O. J., Lucena J., Smits K. M. A review of the environmental and health implications of recycling mine tailings for construction purposes in artisanal and small-scale mining communities. Extractive Industries and Society, 2022, 9, 101019, https://doi.org/10.1016/j.exis.2021.101019;
• Florez C., Restrepo-Baena O., Tobon J. I. Effects of calcination and milling pre-treatments on natural zeolites as a supplementary cementitious material. Construction and Building Materials, 2021, 310, 125220, https://doi.org/10.1016/j.conbuildmat.2021.125220;
• Schwartz M., Smits K., Smith J., Phelan T., Restrepo Baena O. J. Incorporating positive deviance into comprehensive remediation projects: a case study from artisanal and small-scale gold mining in the municipality of Andes, Colombia. Environmental Science and Policy, 2021, 123, 142–150, https://doi.org/10.1016/j.envsci.2021.05.021;
• Feijoo B. A., Tobón J. I., Restrepo-Baena O. J. Substitution of aggregates by waste foundry sand: effects on physical properties of mortars. Materiales de Construccion, 2021, 71(343), e251, https://doi.org/10.3989/MC.2021.10320;
• Betancur-Granados N., Molina J. E., Pöllmann H., Tobón J. I., Restrepo-Baena O. J. Influence of metallic precursors in the mineralogy and reactivity of belite cement clinkers obtained by flame spray pyrolysis. Materials Today Communications, 2021, 26, 101917, https://doi.org/10.1016/j.mtcomm.2020.101917;
• Betancur-Granados N., Tobón J. I., Restrepo-Baena O. J. General study of Flame Spray Pyrolysis synthesis method. Revista Materia, 2021, 26(4), e13105, https://doi.org/10.1590/S1517-707620210004.1305;
• Martinez G., Restrepo-Baena O. J., Veiga M. M. The myth of gravity concentration to eliminate mercury use in artisanal gold mining. Extractive Industries and Society, 2021, https://doi.org/10.1016/j.exis.2021.01.002;
• Restrepo-Baena O., Cabrera-Poloche F., Tobón J. I. et. al. Valorization of waste from sand wash muds of an aggregates plant: Evaluation as a supplementary cementitious material. International Journal of Applied Ceramic Technology, 2020, 17(6), 2669–2680, https://doi.org/10.1111/ijac.13597;
• Garces-Granda A., Lapidus G. T., Restrepo-Baena O. J. Effect of a thermal pretreatment on dissolution kinetics of a limonitic laterite ore in chloride media. Hydrometallurgy, 2020, 196, 105428, https://doi.org/10.1016/j.hydromet.2020.105428;
• Holley E. A., Smith N. M., Delgado Jimenez J. A., Cabezas I. C., Restrepo-Baena O. J. Socio-technical context of the interactions between large-scale and small-scale mining in Marmato, Colombia. Resources Policy, 2020, 67, 101696, https://doi.org/10.1016/j.resourpol.2020.101696;
• Chavarriaga E. A., Lopera A. A., Wermuth T. B., Arcaro S., Gómez A., Restrepo O. J., Alarcón J., Bergmann C. P. Synthesis by solution combustion of inorganic blue pigments MFe2(P2O7)2: Influence of the cation M (Zn2+, Co2+, Cu2+, and Mg2+) on their optical properties. Solid State Sciences, 2020, 103, 106180, https://doi.org/10.1016/j.solidstatesciences.2020.106180;
• Chaverra D. E., Restrepo-Baena O. J., Ruiz M. C. Cobalt extraction from sulfate/chloride media with trioctyl(alkyl)phosphonium Chloride Ionic Liquids. ACS Omega, 2020, 5(11), 5643–5650, https://doi.org/10.1021/acsomega.9b03266;
• Velásquez D., Restrepo O. J., Kretschmann J. Post mining activities in coal mining in Amagá, Antioquia - Colombia, challenges and possible solutions. 2020 SME Annual Conference and Expo, 2020;
• Betancur-Granados N., Molina J.E., Pöllmann H., Tobón J.I., Restrepo-Baena O. J. Influence of metallic precursors in the mineralogy and reactivity of belite cement clinkers obtained by flame spray pyrolysis. Materials Today Communications, 2020, 101917, https://doi.org/10.1016/j.mtcomm.2020.101917;
• Smits K. M., McDonald L., Smith N. M., Gonzalez F., Lucena J., Martinez G., Restrepo O. J., Rosas S. Voces Mineras: Clarifying the future of artisanal and small-scale mining collaborations. Extractive Industries and Society, 2020, 7(1), 68–72, https://doi.org/10.1016/j.exis.2019.12.003;
• Tobón J. I., Reales O. M., Restrepo O. J., Borrachero M. V., Payá, J. Effect of pyrogenic silica and nanosilica on portland cement matrices. Journal of Materials in Civil Engineering, 2018, 30(10), 04018266, https://doi.org/10.1061/(ASCE)MT.1943-5533.0002482;
• Pinto A. F., Tobón J. I., Betancur-Granados N., Restrepo-Baena O. J. Evaluation of the reactivity of artificial mixtures of Portland cement clinker obtained by flame spray pyrolysis. Material Science Research India, 2019, 16(2);
• Huang Q., Talan D., Restrepo J. H., Restrepo Baena O. J., Kecojevic V., Noble A. Characterization study of rare earths, yttrium, and scandium from various Colombian coal samples and non-coal lithologies. International Journal of Coal Geology, 2019, 209, 14–26, https://doi.org/https://doi.org/10.1016/j.coal.2019.04.008;
• Pimentel M. S., Flórez C. A., Restrepo Baena O. J. International Interdisciplinary Collaboration: Artisanal and Small Scale Gold Mining and Mercury Contamination in Colombia. Journal of Interdisciplinary Sciences, 2019, 3(1);
• López Ramirez C. D., Chaverra D. E., Restrepo Baena O. J. Obtaining Urea from Effluents of Gold Cyanidation Process. Material Science Research India. 2019, 16(1);
• Brüger A., Fafilek G., Restrepo B. O. J., Rojas-Mendoza L. On the volatilisation and decomposition of cyanide contaminations from gold mining. Science of the Total Environment, 2018, 627, 1167–1173, https://doi.org/10.1016/j.scitotenv.2018.01.320;
• Perea C. G., Restrepo O. J. Use of amino acids for gold dissolution. Hydrometallurgy, 2018, 177, 79–85, https://doi.org/10.1016/j.hydromet.2018.03.002;
• Garces-Granda A., Lapidus G. T., Restrepo-Baena O. J. The effect of calcination as pre treatment to enhance the nickel extraction from low-grade laterites. Minerals Engineering, 2018, 120, 127–131, https://doi.org/10.1016/j.mineng.2018.02.019;
• Colorado H. A., Nino J. C., Restrepo O. Applications and opportunities of nanomaterials in construction and infrastructure. Minerals, Metals and Materials Series, 2018, Part F8, 437–452, https://doi.org/10.1007/978-3-319-72484-3_46;
• Betancur-Granados N., Restrepo-Baena O. J. Flame spray pyrolysis synthesis of ceramic nanopigments CoCr2O4: The effect of key variables. Journal of the European Ceramic Society, 2017, 37(15), 5051–5056, https://doi.org/10.1016/j.jeurceramsoc.2017.06.024;
• Arango-Aramburo S., Jaramillo P., Olaya Y., Smith R., Restrepo O. J. et. al. Simulating mining policies in developing countries: The case of Colombia. Socio-Economic Planning Sciences, 2017, 60, 99–113, https://doi.org/10.1016/j.seps.2017.04.002;
• Vargas P., Restrepo-Baena O., Tobón J. I. Microstructural analysis of interfacial transition zone (ITZ) and its impact on the compressive strength of lightweight concretes. Construction and Building Materials, 2017, 137, 381–389, https://doi.org/10.1016/j.conbuildmat.2017.01.101;
• Uchima J. S., Restrepo-Baena O. J., Tobón J. I. Mineralogical evolution of portland cement blended with metakaolin obtained in simultaneous calcination of kaolinitic clay and rice husk. Construction and Building Materials, 2016, 118, 286–293, https://doi.org/10.1016/j.conbuildmat.2016.05.063;
• Bustamante N., Danoucaras N., McIntyre N., Díaz-Martínez J. C., Restrepo-Baena O. J. Review of improving the water management for the informal gold mining in Colombia. Revista Facultad de Ingenieria, 2016, (79), 174–184, https://doi.org/10.17533/udea.redin.n79a16;
• Uchima J. S., Restrepo O. J., Tobón J. I. Pozzolanicity of the material obtained in the simultaneous calcination of biomass and kaolinitic clay. Construction and Building Materials, 2015, 95, 6919, 414–420, https://doi.org/10.1016/j.conbuildmat.2015.07.104;
• Tobón J. I., Payá J., Restrepo O. J. Study of durability of Portland cement mortars blended with silica nanoparticles. Construction and Building Materials, 2015, 80, 92–97, https://doi.org/10.1016/j.conbuildmat.2014.12.074;
• Giraldo C., Tobón J. I., Restrepo Baena O. J. Ultramarine blue pigment: A non-conventional pozzolan. Construction and Building Materials, 2012, 36, 305–310, https://doi.org/10.1016/j.conbuildmat.2012.04.011;
• Tobón J. I., Payá J. J., Borrachero M. V., Restrepo O. J. Mineralogical evolution of Portland cement blended with silica nanoparticles and its effect on mechanical strength. Construction and Building Materials, 2012, 36, 736–742, https://doi.org/10.1016/j.conbuildmat.2012.06.043;
• Tobón J.I., Paya J., Borrachero M.V., Soriano L., Restrepo O. J. Determination of the optimum parameters in the high resolution thermogravimetric analysis (HRTG) for cementitious materials. Journal of Thermal Analysis and Calorimetry, 2012, 107 (1), 233–239, https://doi.org/10.1007/s10973-010-0997-0;
• Tobón J. I., Restrepo O. J., Payá J. Comparative analysis of performance of Portland cement blended with nanosilica and silica fume. DYNA (Colombia), 2010, 77(163), 37–46.

International Congress:

• Restrepo J. H., Restrepo Baena O. J. Identificación de elementos de tierras raras en carbones colombianos. X Congreso Internacional de Materiales. CIM 2019. Bucaramanga, Octubre 23 -25 de 2019;
• Ávila Suárez W., Vahos Cortes Y. A., Restrepo Baena O. J., Betancur Granados N., Jorge Iván Tobón. Evaluación de la adición de nanopartículas de silicatos dicálcicos obtenidos por el método de Pirolisis de aerosol en llama al cemento Portland. X Congreso Internacional de Materiales. CIM 2019. Bucaramanga, Octubre 23-25 de 2019;
• Cabrera Poloche F. D., Restrepo Baena O. J., Tobón J. I. Medición de color en pastas de cemento blanco coloreado con pigmentos inorgánicos y evaluación dela resistencia a la compresión simple en morteros. X Congreso Internacional de Materiales. CIM 2019. Bucaramanga, Octubre 23-25 de 2019;
• Pinto A. F., Tobón J. I., Restrepo Baena O. J., Betancur N. Synthesis of tricalcium aluminate through the alternative method flame spray pyrolysis. X Congreso Internacional de Materiales. CIM 2019. Bucaramanga, Octubre 23-25 de 2019;
• Betancur N., Marín N., Estupiñán H. A., Tobón J. I., Restrepo Baena O. J. Study of the formation of tricalcium silicate after thermal treatments of particles made by flame spray pyrolysis. X Congreso Internacional de Materiales. CIM 2019. Bucaramanga, Octubre 23-25 de 2019;
• Tobón J., Uchima J., Restrepo Baena O. Correlation between compressive strength in blended cement mortars and pozzolanic activity assessment on lime- pozzolan pastes. 15^th International Congress on the Chemistry of Cement. Prague, Czech Republic, September 16–20, 2019;
• Betancur-Granados N., Tobón J. I., Restrepo Baena O. J. C3S and C2S nanoparticles synthesized by flame spray pyrolysis (FSP). 15^th International Congress on the Chemistry of Cement. Prague, Czech Republic, September 16–20, 2019;
• Restrepo J., Betancur-Granados N., Tobón J. I., Restrepo Baena O. J. Hydraulic reactivity of calcium silicates synthesized by combustion in solution – SCS. 15^th International Congress on the Chemistry of Cement. Prague, Czech Republic, September 16–20, 2019;
• Aguilera Torrero L., Montero Matos J. , Restrepo Baena J. Evaluación del riesgo del cierre de canteras de materiales para la construcción en Cuba. XII Convención Internacional sobre Medio Ambiente y Desarrollo. Por la integración y cooperación para la sostenibilidad. 1-5 de Julio de 2019. La Habana, Cuba;
• Flórez Vergara C. A.,  Restrepo Baena O. J. Methodologies for teaching sustainable technologies for the elimination of the use of mercury in artisanal gold mining. 30^th SOMP Anual Meeting. Bochum, Germany. June 29^th-July5^th, 2019.

Research projects:

1. Study of rare earth elements from Colombian coal for hightech industries and clean energy technologies (2019);
2. Sustainable Communities & Gold Supply Chains: Integrating Responsible Engineering & Local Knowledge to Design, Implement and Evaluate Sustainable Artisanal Mining in Latin America;
3. Development and implementation of a clean technology project in gold-bearing areas of ANTIOQUIA department (2015);
4. Implementation of ecological technologies for natural environment protection and eliminating applying mercury in gold production in ANDES – ANTIOQUIA municipality;
5. Social research for measuring success of mining projects (2017-2019);
6. Production of calcium silicates for cement industry by aerosol flame pyrolysis method (2018);
7. Analysis of development and sustainability of a mining-affected territory;

and other research projects.