Browsing by Author "Jara Padilla, Melanie Katherine"

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    Control de los problemas asociados al insoluble mediante la modificación del circuito de la Planta de Flotación Selectiva de Molibdeno, Codelco División Chuquicamata.
    (Universidad de Concepción, 2024) Jara Padilla, Melanie Katherine; Gutiérrez Briones, Leopoldo Esteban Manuel
    This thesis project was carried out in Codelco, División Chuquicamata at the Molybdenum and Filter Plant, and consisted of the implementation of a new proposed layout aiming to improve the control over the negative effects related to insoluble (in selective flotation , understanding Ins as all gangue which bear silica and oxygen. During May and June 2023, caused by an increasement of Ins in the collective concentrate (CC), the head thickeners C6/C7 overflowed 14.500 t CC with 2.5% Mo. Under the normal circuit configuration, the flow first cleaning tail (K1L) is sent back completely to the thickeners C6/C7. The proposed circuit proposes to just send back half of the K1L, this flow is characteristic of presenting high grades of Ins and fine granulometry. Regarding the sedimentation tests, the results proved that under a high Ins grade in CC, an increase in the mass ratio of K1L increases the NTU values of clear water and decreases the laboratory sedimentation rate by 33%. The K1L flotation tests revealed that the molybdenum contained in that flow can be recovered up to 90.7% for conditions of 1.9% Mo in the feed and flotation time of 8 minutes. It has been proven that an 8.5 pH condition in average increases the Mo R about 3%. The kinetic flotation tests co nducted under the usual circuit configuration revealed that in all the flotation stages the number of cells should be decreased. On the other hand, due to time constraints of the industrial trial of the proposed circuit, no results were obtained regarding this configuration kinetics, so no conclusive analysis related could be made, nor a comparison between both circuit configurations kinetics. Regarding the usual and proposed circuit configurations assessed, it was shown that both configurations reached the operational standard over 92% Mo R and final concentrate quality over 48% Mo, specifically, they reached 94.8% Mo R 48.54% Mo and 93.6% Mo R 50.33% Mo, respectively. Finally, the proposed circuit configuration decreased the K1L flow mass that recirculated to the head thickeners to 30%. Even though the operational scenario that led to the assessment of this proposed circuit had changed and improved, it was stated that this operational proposal could an d will be considered as an option under possible future scenarios that would experience the molybdenum plant.
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