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1
artículo
The arsenopyrite, FeAsS, it is a mineral that is commonly found associated with gold. In this kind of mineral, Gold is presented in sub-microscopic size particles, encapsulated in a matrix of the same mineral or forming a solid solution, this does not allow the recovery of gold with the available lixiviation techniques. Moreover, a fine grinding does not a chive to break the matrix in which the gold is located, not allowing the lixiviation solutions to come in. Some alternatives that lead to the recovery of gold from those minerals include chemical oxidation, oxidation under pressure, bacterial oxidation and roasting oxidation (which is very polluting due to the emission of As2O3 y SO2 gases. The aim of the following study is to identify the conditions to break the arsenopyrite matrix for continuing the usual process of cianuration. For doing so, experiments were carried out containing a...
2
artículo
Publicado 2017
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La arsenopirita, FeAsS, es un mineral que se encuentra frecuentemente en asociación con oro. En este tipo de mineral, el oro se suele encontrar en forma sub-microscópica, encapsulado en la matriz del mismo mineral, o bien constituyendo una solución sólida, lo cual dificulta o impide la recuperación del oro mediante las técnicas disponibles de lixiviación. Inclusive, una molienda muy fina no logra romper la matriz en la que se encuentra el oro, inhabilitando el acceso a las soluciones de lixiviación. Algunas alternativas conducentes a la recuperación de oro a partir de aquellos minerales, consisten en oxidación química, oxidación a presión, oxidación bacteriana y tostación oxidante (muy contaminante por generación de gases de As2O3 y SO2). El presente estudio pretende identificar las condiciones para ruptura de la matriz de la arsenopirita para con ello continuar con el pr...
3
artículo
Publicado 2018
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Understanding the changes of a mineral during ore processing is of capital importance for the development of strategies aimed at increasing the efficiency of metal extraction. This task is often difficult due to the variability of the ore in terms of composition, mineralogy and texture. In particular, surface processes such as metal re-adsorption (preg-robbing) on specific minerals are difficult to evaluate, even though they may be of importance as the re-adsorbed material can be blocking the valuable mineral and negatively affect the extraction process. Here, we show a simple yet powerful approach, through which surface processes in individual minerals are identified by combining polarization microscopy (MP) and X-ray photoelectron spectroscopy (XPS). Taking as an example a silver-containing polymetallic sulfide ore from the Peruvian central Andes (pyrite-based with small amounts of gal...
4
artículo
Publicado 2018
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Understanding the changes of a mineral during ore processing is of capital importance for the development of strategies aimed at increasing the efficiency of metal extraction. This task is often difficult due to the variability of the ore in terms of composition, mineralogy and texture. In particular, surface processes such as metal re-adsorption (preg-robbing) on specific minerals are difficult to evaluate, even though they may be of importance as the re-adsorbed material can be blocking the valuable mineral and negatively affect the extraction process. Here, we show a simple yet powerful approach, through which surface processes in individual minerals are identified by combining polarization microscopy (MP) and X-ray photoelectron spectroscopy (XPS). Taking as an example a silver-containing polymetallic sulfide ore from the Peruvian central Andes (pyrite-based with small amounts of gal...
5
artículo
Publicado 2018
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Understanding the changes of a mineral during ore processing is of capital importance for the development of strategies aimed at increasing the efficiency of metal extraction. This task is often difficult due to the variability of the ore in terms of composition, mineralogy and texture. In particular, surface processes such as metal re-adsorption (preg-robbing) on specific minerals are difficult to evaluate, even though they may be of importance as the re-adsorbed material can be blocking the valuable mineral and negatively affect the extraction process. Here, we show a simple yet powerful approach, through which surface processes in individual minerals are identified by combining polarization microscopy (MP) and X-ray photoelectron spectroscopy (XPS). Taking as an example a silver-containing polymetallic sulfide ore from the Peruvian central Andes (pyrite-based with small amounts of gal...
6
artículo
Publicado 2024
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La investigación realizada en las aguas vertidas por el depósito de relave N°6 de la planta concentradora Mahr Tunel, Yauli – La Oroya, promueve el uso del hipoclorito de calcio como un agente oxidante y el cloruro férrico como un agente coagulante, con los cuales se logrará remover los metales pesados contenidos en las aguas de la relavera. Como metales pesados presentes en forma iónica en las aguas tenemos, el cobre, plomo, zinc, fierro, arsénico y cadmio, los cuales por encima de los límites máximos permisibles (LMP) son peligrosos para la vida humana y el ambiente. Las pruebas a nivel laboratorio, permitió determinar la concentración y dosis requeridas para que la remoción sea eficiente y cumpla con el Límite Máximo Permisible-Efluentes Mineros, Metalúrgicos-MINAM. En el proceso de remoción, se usó como regulador de pH la soda caustica a 26.3 ppm para alcanzar un p...
7
artículo
Publicado 2024
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La investigación realizada en las aguas vertidas por el depósito de relave N°6 de la planta concentradora Mahr Tunel, Yauli – La Oroya, promueve el uso del hipoclorito de calcio como un agente oxidante y el cloruro férrico como un agente coagulante, con los cuales se logrará remover los metales pesados contenidos en las aguas de la relavera. Como metales pesados presentes en forma iónica en las aguas tenemos, el cobre, plomo, zinc, fierro, arsénico y cadmio, los cuales por encima de los límites máximos permisibles (LMP) son peligrosos para la vida humana y el ambiente. Las pruebas a nivel laboratorio, permitió determinar la concentración y dosis requeridas para que la remoción sea eficiente y cumpla con el Límite Máximo Permisible-Efluentes Mineros, Metalúrgicos-MINAM. En el proceso de remoción, se usó como regulador de pH la soda caustica a 26.3 ppm para alcanzar un p...
8
tesis de grado
Publicado 2020
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The alternative to protect yourself from UV rays and prevent serious injuries and even skin cancer is in sunblock, also called physical screens. This product, due to its characteristics, has high resistance and durability over time, unlike sunscreen, which is commonly used and does not offer the effectiveness of the first but is used due to its low cost and due to the lack of information that exists in this regard. Considering the need to have an effective product for the prevention and care of the skin, our objective is to determine the feasibility and viability of the operation process and launch to the market of a 100% Peruvian brand sunblock that contains oxide zinc and titanium dioxide. This research includes a pre-operational year (2020) and five operational years (2021 to 2025). It takes place in Lima department and the plant’s location is in the Lince district. Likewise, the va...
9
artículo
Publicado 2006
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The Acid drainages of underground Mines, are one of the main sources of contamination of superficial and underground waters therefore of environment. This phenomenon can remain for a long time if it does not take suitable measures as the passive treatment whose foundation are the processes physical, chemical and biological that takes place in the natural wetland in which the bacterial reduction of sulphates and the oxidation and hydrolysis catalyzed by bacteria, are the most important activities. The practical application are the aerobics wetlands and the artificial anaerobic wetlands, those that demonstrate to satisfactory results in the reduction of the amount of dissolved metals and the elevation of pH of the effluents and the sulphate diminution. This technology was investigated, studied and implemented in the United States, whose results have been very satisfactory in which they tal...
10
artículo
Publicado 2006
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The Acid drainages of underground Mines, are one of the main sources of contamination of superficial and underground waters therefore of environment. This phenomenon can remain for a long time if it does not take suitable measures as the passive treatment whose foundation are the processes physical, chemical and biological that takes place in the natural wetland in which the bacterial reduction of sulphates and the oxidation and hydrolysis catalyzed by bacteria, are the most important activities. The practical application are the aerobics wetlands and the artificial anaerobic wetlands, those that demonstrate to satisfactory results in the reduction of the amount of dissolved metals and the elevation of pH of the effluents and the sulphate diminution. This technology was investigated, studied and implemented in the United States, whose results have been very satisfactory in which they tal...
11
artículo
In Peru, there are two types of jewelry practice (industrial and artisanal) the second mentioned has a greater participation of people in this context the contribution is for the development of artisanal jewelry (handmade) carrying out a variety of operations with a very high incidence in the manual elaboration to obtain the product (jewel) for sale in the national market. Within the processing: initial step is with casting, in this area the analysis and follow-up was carried out to obtain the optimal and adequate alloy, in this procedure the phenomenon of the oxidation of the material (alloy) occurs, whose manifestation is the affirmation in the superficial part of the visible material, due to the lack of the inert system (zone without oxygen) necessary in it, to reduce the event, the lack of oxygen containment, does not contribute to the good surface presentation after casting, ultimat...
12
tesis de grado
El empleo de las enzimas en la industria alimentaria cada día va en aumento. Aproximadamente el 30% de las enzimas aisladas en el mundo se emplea en la industria alimentaria, alcanzando una facturación anual superior a los cien mil millones de dólares. Las enzimas poseen múltiples aplicaciones en la industria alimentaria que va desde su empleo en la industria láctea para retirar la lactosa de la leche para consumo de un sector de la población que es intolerante a la lactosa, para tal efecto se emplea la betagalactosidasa, así también es empleado en la industria quesera para la fabricación de quesos en el cual participa la renina microbiana obtenida por recombinación de genes. En la gastronomía las enzimas participan en el ablandamiento de carnes, así tenemos a la papaína y la bromelina. Asimismo la enzima glucosa oxidasa es empleado en la industria de deshidratación del hue...
13
tesis de grado
Publicado 2017
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La tecnología de ultrasonido aplicada al tratamiento de agua residual, como proceso de oxidación avanzada, cada día está cobrando mayor importancia debido a la tendencia de encontrar tecnologías limpias o amigables con el medio ambiente, haciendo un balance entre el costo económico y costo social. Existen antecedentes que demuestran la descomposición de algunos compuestos orgánicos durante el proceso de cavitación al aplicar esta tecnología a una muestra creada en laboratorio; sin embargo, en esta investigación se estudió la eficiencia del ultrasonido sobre un efluente real, tratado parcialmente por sistema de lagunas de aireación y mediante el uso de un equipo tipo baño ultrasónico de 35 kHz de frecuencia y 5,7 litros de capacidad. Los parámetros analizados fueron: aceites y grasas, DBO5, DQO, SST, coliformes termotolerantes, coliformes Totales; tomando como referencia l...
14
tesis de grado
Publicado 2024
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The research was carried out in communities of the Chapra ethnic group, in the Morona district. It is a non-experimental, observational-descriptive, analytical, cross sectional quantitative study. A structured interview was applied to the leaders of the Chapra Autonomous Government and to the Apu of the communities. The reliability of the Cronbach's Alpha instrument is 0.82. The results of the environmental baseline of the abiotic and biotic environment show that the air remains pure and free of contaminants, and there are no strong winds. The rains are typically from the humid rainforest, fluctuating between 2000 and 3000 mm annually. The annual temperature ranges from a minimum of 22°C to a maximum of 34°C. The soil does not present areas of erosion, salinity, poor drainage, or soil contamination by agrochemicals, but there are localized points of contamination by oil spills and runo...
15
tesis doctoral
Publicado 2022
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Photoelectrochemical (PEC) processes have become an efficient and viable method for solar energy conversion into zero-emission fuels by harnessing and storage the power of the sun, which offers an environment-friendly approach. Hydrogen is considered as a sustainable and suitable energy alternative in comparison to energy systems based on the consumption of conventional hydrocarbon fuels. In particular, hydrogen production by PEC water splitting represents an attractive alternative to enhance the efficiency of water splitting process using sun light. Current research in this field is devoted to the fabrication and evaluation of new photoactive materials that upon sunlight absorption enable water-splitting PEC reactions with high efficiency and durability. Silicon based compounds offer a good opportunity as photoactive material due to its high abundance and current scalable technologies. ...
16
tesis doctoral
Publicado 2022
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Photoelectrochemical (PEC) processes have become an efficient and viable method for solar energy conversion into zero-emission fuels by harnessing and storage the power of the sun, which offers an environment-friendly approach. Hydrogen is considered as a sustainable and suitable energy alternative in comparison to energy systems based on the consumption of conventional hydrocarbon fuels. In particular, hydrogen production by PEC water splitting represents an attractive alternative to enhance the efficiency of water splitting process using sun light. Current research in this field is devoted to the fabrication and evaluation of new photoactive materials that upon sunlight absorption enable water-splitting PEC reactions with high efficiency and durability. Silicon based compounds offer a good opportunity as photoactive material due to its high abundance and current scalable technologies. ...
17
tesis de grado
Publicado 2016
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RESUMEN Esta tesis pretende evaluar el efecto de la concentración de ácido sulfúrico y granulometría en la extracción de cobre por lixiviación a partir de un mineral oxidado de la zona Cerro Corona”. La Hipótesis a mayor concentración de ácido sulfúrico y menor granulometría, se obtendrá una mayor recuperación de Cobre mediante el proceso de lixiviación ácida por agitación; el tipo de estudio empleado es “experimental”. Se eligió el diseño experimental bifactorial realizándose 3 niveles de Concentración de Ácido Sulfúrico (%): 1, 3 y 5 con tres niveles de Granulometría: #100, #140, #200, se realizó 3 réplicas para cada interacción; la presente tesis considera una población de mineral oxidado con alta ley de Cobre de la zona Cerro Corona; así mismo la muestra se tomó de diferentes puntos del cono que descarga el volquete, tanto de gruesos, semigruesos y ...
18
tesis de grado
Publicado 2022
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En la actualidad existen diversas muertes de las truchas por varios motivos como contaminación de dióxido de carbono, oxido disuelto en el agua, temperaturas climatológicas de la provincia y enfermedades a los peces, estos son los puntos más importantes en la acuicultura. Como consecuencia realiza una mayor tasa de mortalidad en las piscigranjas, como resultado genera gran pérdida de economía, inversión de material y tiempo a microempresarios que se encargan en este rubro de la crianza y en muchos casos los encargados de las piscigranjas dejan de seguir produciendo y criando alevines y eso es un factor problemático para la población que no produce en la economía. Debido a esta problemática, en esta tesis se presenta un sistema de monitoreo para la mejora de la calidad de las piscigranjas a través del control de parámetros en el agua (Temperatura, oxígeno disuelto (O2) y pH)...
19
tesis de grado
Publicado 2023
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Universidad Nacional Agraria La Molina. Facultad de Zootecnia. Departamento Académico de Producción Animal
