Browsing by Author "Vallejos Aravena, Paulina Elvira"
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Thesis Caracterización de la dosificación de agua de mar óptima en la etapa de aglomerado de minera Antucoya, para distintas mezclas de UGM's(2023-03) Soto Madariaga, Adriana Dennise; Vallejos Aravena, Paulina Elvira; Departamento de Ingeniería Química y Ambiental; Yanatos Bernardino, JuanThesis CARACTERIZACIÓN DEL PROCESO DE FLOTACIÓN INDUSTRIAL A PARTIR DE RELACIONES TAMAÑO-LIBERACIÓN(Universidad Técnica Federico Santa María, 2016) Vallejos Aravena, Paulina Elvira; Universidad Tecnica Federico Santa Maria UTFSM DEPARTAMENTO DE INGENIERÍA QUÍMICA Y AMBIENTAL; YIANATOS BERNARDINO, JUAN; VINNETT PERALTA, LUIS EDUARDOThe dissemination of valuable mineral in deposits is a very significant condition in mineral processing. This property determines the level of gringing needed to reach the level of liberation required in the next stage of separation. A higher dissemination indicates that the grain size of the mineral in deposit is smaller. Thus, it is necessary to obtain particules of finer size to increase mineral liberation, which implies an increase in the energy consumption in the comminution stage. However, to reach an appropiate yield in the separation stage, mineral particles should not be excessively fine, because this condition limits the flotation rate and the maximum recovery of these minerals. In the separation stage by flotation, the different streams of the process are commonly characterized according to their particle size, because this variable directly affects the mineral recovery. Nevertheless, minerals have also a distribution of liberation for every class of particle size, which determines a flotation rate, which is a function of these two variables. Nowadays, there are advanced tools for the mineralogical characterization of the streams associated with the flotation process. Examples of these are the technologies QEMSCAN (Quantitative Evaluation of Minerals by Scanning Electron Microscopy) and MLA (Mineral Liberation Analyzer), which allow to obtain mineralogical information by size and liberation classes. However, these instruments are complex and expensive, and therefore there is still only limited access to them. Taking all these into account, in this thesis a methodology to characterize the mineral feed to the flotation process was proposed, by liberation and particle size, from a reduced number of particle size and mineral liberation measurements. This methodology contemplates a modification of the classical Gaudin liberation model, incorporating a grain size distribution for the mineral in the ore deposit. Thus, from the mineral granulometric information, feed grade, grain size distribution and a simplified liberation model, the mineral in the flotation feed was characterized, according to the particle size and mineral liberation. This result cannot be obtained by applying the conventional Gaudin model, which considers the mineral grain size as a constant in the ore deposit. Results from a previous research were analyzed, where a Galena mineral was characterized in different streams of a pilot flotation process. The available information included the mass distribution of the floatable mineral, by size and liberation (from MLA analysis) in the feed. The data fit for that distribution was performed, based on the proposed methodology, estimating the grain size distribution of the mineral in the ore deposit. The best fit was obtained by using a Gamma distribution for the mineral grain size, showing good agreement with the data trend. Thick particles are concentrated mostly in the low liberation classes, while the finer mineral presented a greater mass in the higher liberation classes. At industrial scale, the mineral (copper sulfide) in the feed to a Rougher circuit was characterized, by liberation and particle size, applying the methodology proposed in this thesis and considering the QEMSCAN analysis for the mineral. Then, from the estimated floatable mineral distribution, by size and liberation classes, along with the overall recovery and top of froth (TOF) grade profiles measurement by size class, a characterization of the collection rate along the Rougher flotation bank was carried out. These profiles were fit by estimating a rate constant and a maximum recovery for every liberation and size class. The overall recovery was obtained as a function of the collection zone recovery and the froth zone recovery. These results showed a good fitting to describe the overall Cu recovery profile, while TOF grade profiles of Cu showed a good fit for the data trend. The results showed that the rate constant and the maximum recovery increase towards higher liberation classes and decrease when the particle size increases. From the rate constants and the maximum recoveries obtained, the recovery profiles were described along the Rougher flotation circuit as a function of particle size and mineral liberation. It was observed that the effect of a change in mineral liberation, on the recovery profile, was more significant in comparison to the effect of the particle size, for the particle sizes and liberation classes considered in this analysis. The development of this new methodology provides a tool to characterize industrial flotation circuits for diagnose effects and potentially for the flotation process control, from a reduced number of measurements of particle size and mineral liberation.Thesis Estudio del efecto de calidad de agua en el proceso de flotación de planta concentradora El Soldado(2022-10) Pizarro Flores, Vania Delia; Vallejos Aravena, Paulina Elvira; Departamento de Ingeniería Química y Ambiental; Yianatos Bernardino, JuanThesis EVALUACIÓN DE CARACTERÍSTICAS DE TRANSPORTE DE ESPUMA EN CELDAS DE FLOTACIÓN(2018) Matamoros Lagos, Constanza Patricia; Departamento de Ingeniería Química y Ambiental; Yianatos Bernardino, Juan; Vallejos Aravena, Paulina Elvira
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