Jatropha curcas L. Oil Selectivity in Froth Flotation

Authors: André C. Silva, Izabela L. A. Moraes, Elenice M. S. Silva, Carlos M. Silva Filho

Abstract:

In Brazil, most soils are acidic and low in essential nutrients required for the growth and development of plants, making fertilizers essential for agriculture. As the biggest producer of soy in the world and a major producer of coffee, sugar cane and citrus fruits, Brazil is a large consumer of phosphate. Brazilian’s phosphate ores are predominantly from igneous rocks showing a complex mineralogy, associated with carbonites and oxides, typically iron, silicon and barium. The adopted industrial concentration circuit for this type of ore is a mix between magnetic separation (both low and high field) to remove the magnetic fraction and a froth flotation circuit composed by a reverse flotation of apatite (barite’s flotation) followed by direct flotation circuit (rougher, cleaner and scavenger circuit). Since the 70’s fatty acids obtained from vegetable oils are widely used as lower-cost collectors in apatite froth flotation. This is a very effective approach to the apatite family of minerals, being that this type of collector is both selective and efficient (high recovery). This paper presents Jatropha curcas L. oil (JCO) as a renewable and sustainable source of fatty acids with high selectivity in froth flotation of apatite. JCO is considerably rich in fatty acids such as linoleic, oleic and palmitic acid. The experimental campaign involved 216 tests using a modified Hallimond tube and two different minerals (apatite and quartz). In order to be used as a collector, the oil was saponified. The results found were compared with the synthetic collector, Fotigam 5806 produced by Clariant, which is composed mainly by soy oil. JCO showed the highest selectivity for apatite flotation with cold saponification at pH 8 and concentration of 2.5 mg/L. In this case, the mineral recovery was around 95%.

Keywords: Froth flotation, Jatropha curcas L., microflotation, selectivity.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1126846

References:

[1] J. A. Quaggio, “Acidez e calagem em solos tropicais,” Campinas: Instituto Agronômico de Campinas, 2000.
[2] D. L. Broch, S. K. Ranno, “Fertilidade do solo, adubação e nutrição da cultura da soja,” Tecnologia e Produção: Soja e Milho, p.p 212-240, 2012.
[3] Companhia Nacional de Abastecimento (CONAB), “Perspectiva para a agropecuária: safra 2014/2015,” Brasília, vol. 2, pp. 1-155, set. 2014.
[4] D. S. Fonseca, “Fosfato,” In: Sumário Mineral Brasileiro. DNPM/MME, vol. 34, 2014.
[5] A. E. Souza, D. S. Fonseca, “Fosfato,” Brasília: DNPM, pp. 546-568, 2008.
[6] R. C. Guimarães, A. C. Araujo; A. E. C. Peres, “Column Flotation: a key to the production of apatite concentrates from slimes,” In: Beneficiation of phosphates Technology and Sustainability, 1st ed. Littleton, Society of mining, Metallurgy, and Exploration, Inc., v. 1, pp. 135-143, 2006.
[7] M. B. M. Monte, A. E. C. Peres, “Química de superfície na flotação,” In: Tratamento de Minérios, 4th ed., Rio de Janeiro, CETEM/MCT, 2004.
[8] A. B., Luz, F. A. F. Lins, “Introdução ao tratamento de minérios,”. In: Tratamento de Minérios, 5th ed. Rio de Janeiro, CETEM/MCT, 2010.
[9] A. S. Alves, D. S. Costa, A. C. Meireles, R. D. S. Queiroz, A. E. C. Peres, “Aplicabilidade dos óleos de maracujá (Passiflora Edulis) e babaçu (Orbignya Phalerata) na flotação de apatita, calcita e quartzo,” XXV Encontro Nacional de Tratamento de Minérios e Metalurgia Extrativa & VIII Meeting of the Southern Hemisphere on Mineral Technology, Goiânia - GO, vol. 2, pp. 46-52, 2013.
[10] A. Dall’Agnol, “Alimentos vs Bioenergia,”. Portal do Agronegócio, Paraná, Jun. 2007. Available in http://agrolink.com.br/colunistas/ColunaDetalhe.aspx?CodColuna=2389
[11] B. Singh, M. G. R. Swaminathan; V. Ponraj, “Biodiesel Conference towards energy independence: focus on Jatropha”. Ed. Rashtrapati Bhawan, New Delhi, 382 p., 2006.
[12] F. D. S. Araujo; C. V. R. Moura; M. H. Chaves, “Biodiesel metílico dipteryx lacunifera: preparação, caracterização e efeito de antioxidantes na estabilidade à oxidação,” Quim. Nova, vol. 33, n. 8, pp. 1671-1676, 2010.
[13] Instituto Adolfo Lutz, “Métodos químicos e físicos para análise de alimentos,” 4th ed. São Paulo: Instituto Adolfo Lutz; 2008.
[14] D. S. Costa, “Uso de óleos vegetais amazônicos na flotação de minérios fosfáticos,” Doctor Thesis, Escola de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, pp. 191 2012.
[15] M. Canakci, J. V. Gerpen, “Comparison of engine performance and emissions for petroleum diesel fuel, yellow grease biodiesel, and soybean oil biodiesel,” Transactions ASAE, vol. 46, n. 4, pp. 937–944, 2003.
[16] H. J. Berchmans, S. Hirata, “Biodiesel production from crude Jatropha curcas L. seed oil with a high content of free fatty acids,” Bioresource Technology, vol. 99, n. 6, pp. 1716-1721, 2008.
[17] J. Oliveira, “Grau de saponificação de óleos vegetais na flotação seletiva de apatita de minério carbonatítico,” Master Dissertation, Programa de Pós-Graduação em Engenharia Mineral, Universidade Federal de Ouro Preto, pp. 187, 2005.
[18] D. C. Tavares, “Estudo do efeito das misturas de óleos de pinhão manso, fritura e sebo bovino na produção de biodiesel,” Doctor Thesis, Universidade Federal Rural do Rio de Janeiro Instituto de Tecnologia Departamento de Engenharia Química, 2012.
[19] J. C. Lemões, M. L. Potes, R. J. P. Oliveira, L. L Silva, S. D. A. Silva, “Determinação do teor de óleo e perfil graxo de acessos de pinhão-manso da Embrapa Clima Temperado,” In: II Congresso Brasileiro de Pesquisas de Pinhão Manso, Brasília-DF, 2011.
[20] W. M. J. Achten, L. Verchot, Y. J. Franken, E. Mathijs, V. P. Singh, R. Aerts, B. Muys, “Jatropha bio-diesel production and use,” Biomass and bioenergy, vol. 32, pp. 1063–1084, 2008.
[21] P. R. G. Brandão, L. G. Caires, D. S. B. Queiroz, “Vegetable lipid oil-based collectors in the flotation of apatite ores”. Minerals Engineering, vol. 7, n. 7, pp. 917-925, 1994.