Tecnologia em preparação de pastas para disposição de rejeitos

• Ano de defesa: 2016
• Autor(a) principal: Patricia Andrade Sousa
• 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; Engenharia metalúrgica
• Link de acesso: http://hdl.handle.net/1843/BUOS-AN9R22

The stability of a pulp containing very fine particles in a dispersed system can be minimized by increasing the degree of aggregation between the particles. In order to effectively achieve such an intent, chemical reagents can be used which, by virtue of their nature and mode of action, will determine whether aggregation will occur by coagulation, flocculation. The dispersion state of these particles is directly related to the electrostatic potential The most used method for the treatment of phosphate for sludge disposal is the storage in basins (dams). Potential failures in dams can cause major environmental disasters, generation of public outrage, and cause of death, closure of mining plants among other relevant facts. The disposal of tailings in the form of mineral pulp presents several advantages compared to conventional tailings dams, for example: a much smaller area is needed for disposal, better water recovery, the risk of contamination of areas by rupture is lower Of dams, reduces the contamination of process water allowing the reuse of this, facilitates the final recovery of the site among others. Tests were carried out to characterize the sample, with 81% of the sample being magnesian calcite. The sample can be classified as having micropores, where the d50 is 5.10m. The specific mass of the sample is 2.55 g / cm 3. It was used pulps with addition of flocculants with several types of anionic, cationic and nonionic polyacrylamides. Tests were also carried out with pulps with the addition of aluminum sulfate coagulant in order to evaluate the best performance in sedimentation velocity. The results indicated that the best response of the various reagents tested was the Floticor 7464 positive charge polyacrylamide in a flocculent pulp with a dosage of 20 g / t and a settling velocity of 0.6 cm / s. In relation to the characterization of the mineral paste using the densification test, it was verified that, using the flocculant flocculant 7464 with the dosage of 20g / t, it is possible to form a paste with a lower amount of solid in mass.