Variables involved in the planting of rice in the rice husk

Rice production in Brazil in 2010 was approximately 12,2 million tons, and to reach that amount several planting techniques were used with different strains of rice in different rice-growing areas. Since Rice Husk Ash (RHA) is the pozzolan of vegetable origin most studied by researchers working in the area of pozzolanic materials, the present paper evaluates the influence that the form of planting, the climate, the soil, the strain of rice and the origin/amount of nitrogen-based fertilizers used in rice cultivation has on the chemical composition and crystallographic properties of RHA. The results obtained in this paper, confirm the importance of carrying out routine chemical analysis and X-Ray diffraction to maintain the quality control of the CCAs produced, because in situations of large-scale production, husks of different origins may be used.Akasaki, JL.; Silva, E.; Sousa, L.; Melges, J.; Mitsuuchi Tashima, M.; Paya Bernabeu, JJ. (2012). Variables involved in the planting of rice in the rice husk. Key Engineering Materials. 517:430-436. doi:10.4028/www.scientific.net/KEM.517.430430436517Houston, D. F. Rice hulls, Rice Chemistry and Technology. Minnessota: American Association of Cereal Chemistry, 1972. pp.301-352.Amick, J. A. Purificacion of Rice Hulls as a Source of Solar Grade Silicon for Solar Cells. Journal of the Electronchemical Society, Nova Jersey, v. 129, n. 1, pp.864-866, (1982).Della, V. P. Síntese e Caracterização do Pigmento Cerâmico de Hematita, Obtida a partir de Carepa de Aço, Encapsulada em Sílica Amorfa Obtida a partir da Casca de Arroz. 2005. 9 f. Tese (Doutorado em Engenharia de Materiais) – Faculdade de Ciência e Engenharia dos Materiais, Universidade Federal de Santa Catarina, Florianópolis, (2005).Gava, G. P. Estudo Comparativo de Diferentes Metodologias para a Avaliação da Atividade Pozolânica. 1999. 118 f. Dissertação (Mestrado em Engenharia Civil) – Curso de pós-graduação em Engenharia Civil, Universidade Federal de Santa Catarina, Florianópolis, (1999).Thenabadu, M. W. Silica content of rice rusk as determined by soil properties and varietal differences. Trop. Agric. 133: 71-80, (1977).Della, V. P., Hotza, D., Junkes, J., Oliveira, A. P. N. Estudo comparativo entre sílica obtida por lixívia ácida da casca de arroz e sílica obtida por tratamento térmico da cinza de casca de arroz. Química Nova, São Paulo, v. 29, n. 6, pp.1175-1179, (2006).Krishnarao, R. V.; Subrahmanyam, J.; Kumar, T. J. Studies on the formation of black particles in rice husk -ash. Journal of the European Ceramic Society, Grã Bretanha, v. 21, n. 1, pp.99-104, (2001).Associação Brasileira de Normas Técnicas. NBR 12653: Materiais pozolânicos - Especificação. Rio de Janeiro, 1992. 3 p