Estudo de pastas minerais a partir do espessamento de lamas de processamento fosfático

• Ano de defesa: 2016
• Autor(a) principal: Mario Campos de Rezende Neto
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia Metalúrgica Materiais e de Minas; Tecnologia mineral; Engenharia de minas; Floculação
• Link de acesso: http://hdl.handle.net/1843/BUBD-ADTQ4P

Brazilian mining companies have faced obstacles due to the large volumes of waste to be disposed. This results from the fact that the ore processed currently present increasingly low levels, beyond the provision of technology lack of dry waste. particle aggregation processes such as flocculation, have been exploited to produce for the clarified liquid mineraise folders. Due to the lesser amount of water, mineral slurries have several environmental and technological advantages, and in the process of preparing it is necessary to consider the rheological properties of the suspensions. In order to investigate the best Lamaa flocculation conditions from phosphatic processing, a literature review on the subject is done in this work, in addition to performing discontinuous sedimentation tests in test tubes and characterization of folders. The results indicate that the serum calcite, dolomite and apatite as major phases. Flocculants cationic, anionic and nonionic were evaluated, and only one of each category was selected to study the influence of pH and percent solids of the pulp and the flocculant dosage. Results show that the best sedimentation response was obtained at pH 8.50 in presençao 20g / t flocculant anionic A1. The same conditions resulted in greater sediment (2.06 cm / sec) and clarifying liquid (31.25 NTU) in the presence of cationic flocculant C1. The non-ionic flocculant, the presence of 100 g / t pH 11.50 resulted in a reduction of turbidity of the liquid 71.00% and increased sedimentation rate and 89 times. Regarding the reduction, spreading completely across the surface, while more folders with 76.00% showed no significant reduction. the presence of flocculant did not alter the reduction of suspensions, and the slurry itself as mineral slurry density in the range between 66.00 and 72.00% solids by weight in the presence and ausênça flocculant, remaining stable over time. According to the yield stress, the sludge appears as mineral slurry from 68.00% by weight solids, whose yield stress value requires the use of special pumps for transportation.