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Interacción agua/roca y controles fisicoquímicos sobre el procesamiento de minerales en las celdas de flotación: efecto de iones aluminio, calcio y magnesio
(Universidad de Chile, 2016)
ganga asociada a especies de interés y su impacto en etapas de molienda y flotación. Para ello, se cuantificó la disolución de elementos desde diferentes minerales de alimentación hacia la pulpa producida en la etapa de molienda, se identificaron los...
In mineral processing, rocks are reduced in size in the presence of water. This interaction affects directly the physicochemical condicions of process. The flotation process depends of these physi-cochemical variables, as well as the rock composition. To comprehend how these variables interact is essential to understand the recovery of species of economic interest in the flotation stage. This work aims to analyze the gangue effect associated to species of economic interest and its impact on grinding and minerals flotation stages. To achieve this objective, it was neccesary to quantify specific elements dissolved from gangue of mineral to the solution in grinding stage. Also, it was necessary to identify the elements on surface of the processed particles in this stage, it was verified the dissolution/precipitation effect of elements on phisicochemical variables in grinding stage, and it was associated the gangue effect on species dissolution/precipitation and its influence on the metallurgical recovery of species of economic interest through of flotation stage. Different geometallurgical units were analysed about three particular elements: magnesium, alumi-nium and calcium. The dissolution quantification of these elements from this units to the solution was measured through of ICP -OES and complexometry methods. The magnesium was quantified with concentrations between 200 to 300 mg/L, aluminium with concentrations between 0,2 and 1,5 mg/L and calcium with concentrations between 600 and 850 mg/L. The precipitation of these ele-ments was mainly, through of hydroxides (it was checked by XPS method), and it did not generate a significant change in physicochemical parameters as pH, the potential or the dissolved oxygen. In fact, these physicochemical variables controlled the grinding and flotation stages, generating re-coveries close to 90 % in both geometallurgical units. Nevertheless, in this study was also possible to analyse the behaviour of different species of eco-nomic interest, suede the presence of these specific elements. On the one hand it was found that a specie as molybdenite is sensitive to pH and the presence of ions as Ca2+, generating altogether, variations between 98 and 30 % in its metallurgical recovery. On other hand, it was possible to de-terminate that a specie as chalcopyrite is a little dependence of these ions or precipitates (it was ot found satisfactory surface concentrations through SEM -EDS method), but is much more sensitive to changes in physicochemical parameters as potential, which produced metallurgical recoveries between 70 and 10 %. Starting from this, was possible to afirm that two geometallurgical units behave differently in the same operational conditions, therefore a detailed study of each one is relevant and necessary to carry out a mineral processing in technical and economic conditions in line with the challenges which araise today....
In mineral processing, rocks are reduced in size in the presence of water. This interaction affects directly the physicochemical condicions of process. The flotation process depends of these physi-cochemical variables, as well as the rock composition. To comprehend how these variables interact is essential to understand the recovery of species of economic interest in the flotation stage. This work aims to analyze the gangue effect associated to species of economic interest and its impact on grinding and minerals flotation stages. To achieve this objective, it was neccesary to quantify specific elements dissolved from gangue of mineral to the solution in grinding stage. Also, it was necessary to identify the elements on surface of the processed particles in this stage, it was verified the dissolution/precipitation effect of elements on phisicochemical variables in grinding stage, and it was associated the gangue effect on species dissolution/precipitation and its influence on the metallurgical recovery of species of economic interest through of flotation stage. Different geometallurgical units were analysed about three particular elements: magnesium, alumi-nium and calcium. The dissolution quantification of these elements from this units to the solution was measured through of ICP -OES and complexometry methods. The magnesium was quantified with concentrations between 200 to 300 mg/L, aluminium with concentrations between 0,2 and 1,5 mg/L and calcium with concentrations between 600 and 850 mg/L. The precipitation of these ele-ments was mainly, through of hydroxides (it was checked by XPS method), and it did not generate a significant change in physicochemical parameters as pH, the potential or the dissolved oxygen. In fact, these physicochemical variables controlled the grinding and flotation stages, generating re-coveries close to 90 % in both geometallurgical units. Nevertheless, in this study was also possible to analyse the behaviour of different species of eco-nomic interest, suede the presence of these specific elements. On the one hand it was found that a specie as molybdenite is sensitive to pH and the presence of ions as Ca2+, generating altogether, variations between 98 and 30 % in its metallurgical recovery. On other hand, it was possible to de-terminate that a specie as chalcopyrite is a little dependence of these ions or precipitates (it was ot found satisfactory surface concentrations through SEM -EDS method), but is much more sensitive to changes in physicochemical parameters as potential, which produced metallurgical recoveries between 70 and 10 %. Starting from this, was possible to afirm that two geometallurgical units behave differently in the same operational conditions, therefore a detailed study of each one is relevant and necessary to carry out a mineral processing in technical and economic conditions in line with the challenges which araise today....
Régimen jurídico de protección del patrimonio cultural y de los pueblos indígenas en la legislación chilena
(Universidad de Chile, 2001)
UNIVERSIDAD DE CHILE
FACULTAD DE DERECHO
DEPARTAMENTO DE DERECHO PRIVADO
“REGIMEN JURÍDICO DE PROTECCIÓN DEL
PATRIMONIO CULTURAL Y DE LOS PUEBLOS
INDÍGENAS EN LA LEGISLACIÓN CHILENA...
” Memoria para optar al grado de Licenciado en Ciencias Jurídicas y Sociales AUTOR: M. PAOLA GONZÁLEZ CARVAJAL...
” Memoria para optar al grado de Licenciado en Ciencias Jurídicas y Sociales AUTOR: M. PAOLA GONZÁLEZ CARVAJAL...
Desarrollo de un modelo y simulador de sistema de almacenamiento de energía en baterías para estudiar la sinergia entre molienda SAG y la generación eléctrica con paneles solares fotovoltaicos
(Universidad de Chile, 2017)
tienen las principales variables del proceso sobre la disminución del consumo de la red eléctrica. Estas variables son la potencia contratada, el tamaño de la planta fotovoltaica y las capacidades de energía y potencia del sistema de almacenamiento de...
La historia por el libro. Tránsitos y recorridos de La Araucana. Santiago de Chile (1788-1888)
(Universidad de Chile, 2014)
1
ECOLE DES HAUTES ETUDES EN SCIENCES SOCIALES
UNIVERSIDAD DE CHILE
FACULTAD DE FILOSOFIA Y HUMANIDADES
Doctorat en « Histoire & Civilisations »
AUTEUR : AriadnaBIOTTI
TITRE: L...
La historia por el libro. Tránsitos y recorridos de La Araucana. Santiago de Chile (1788- 1888) Tesis para optar al grado de Doctor en Historia Nombre del estudiante: Ariadna Biotti Silva Profesores guías: Roger Chartier- Alejandra...
La historia por el libro. Tránsitos y recorridos de La Araucana. Santiago de Chile (1788- 1888) Tesis para optar al grado de Doctor en Historia Nombre del estudiante: Ariadna Biotti Silva Profesores guías: Roger Chartier- Alejandra...
Análisis de consolidación y secado de relaves para evaluar mejoras de recuperación de aguas en tranques de relave convencionales operados con celdas interiores
(Universidad de Chile, 2019)
, las faenas mineras, que habitualmente se emplazan en zonas áridas del país, se enfrentan a estrictos estándares medioambientales que buscan un mayor control y regulación del uso de agua fresca para propósitos industriales; lo que fomenta el uso de...