Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
1
artículo
Publicado 1999
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A selection of hydrometallurgical applications are shown in the processing of sulfur concentrates, being influenced by environmental regulations; being known as clean technologies. The hydrometallurgy technology of leaching, solvent extraction and electrodeposition is described, as well as a series of current investigations to avoid the production of SO2 through the LIX-SX-EW hydrometallurgical route; as well as solid waste management with arsenic content, for safe storage.
2
artículo
Publicado 1999
Enlace
Enlace
A selection of hydrometallurgical applications are shown in the processing of sulfur concentrates, being influenced by environmental regulations; being known as clean technologies. The hydrometallurgy technology of leaching, solvent extraction and electrodeposition is described, as well as a series of current investigations to avoid the production of SO2 through the LIX-SX-EW hydrometallurgical route; as well as solid waste management with arsenic content, for safe storage.
3
artículo
Publicado 2007
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Mining and metallurgical activity produces liquid effluents as a waste during the extraction process, which must be treated in order to be disposed in the environment, following governmental and environmental legislation. Big and medium size mining industry carry on environmental projects as it is the trend worldwide, but small size and informal mining did not have between its priorities the environmental issue due to the lack of research on clean technologies related to this sector which finally could influence in make more efficient its processes. The main aim of the research is centered on propose solutions with an experimental basis for design and dimension of containers in processes with chemical precipitation and cementing of dissolved metals in liquid effluents. Laboratory tests are detailed for cementing copper from liquid effluents by means of light scrap iron which allows recov...
4
artículo
Publicado 2007
Enlace
Enlace
Mining and metallurgical activity produces liquid effluents as a waste during the extraction process, which must be treated in order to be disposed in the environment, following governmental and environmental legislation. Big and medium size mining industry carry on environmental projects as it is the trend worldwide, but small size and informal mining did not have between its priorities the environmental issue due to the lack of research on clean technologies related to this sector which finally could influence in make more efficient its processes. The main aim of the research is centered on propose solutions with an experimental basis for design and dimension of containers in processes with chemical precipitation and cementing of dissolved metals in liquid effluents. Laboratory tests are detailed for cementing copper from liquid effluents by means of light scrap iron which allows recov...
5
artículo
Publicado 2007
Enlace
Enlace
The rice production includes the agriculture, productive, and distribution process. There are the need of the integral analysis, with the purpose of improve their efficient and competitively. In this contex are presented improvements that impact in the production and productivity in milling rice sited in Arequipa region. For that is making a productive process diagnostic, a benchmarking with the sector enterprises, and the introduction of more celan production concepts.
6
artículo
Publicado 2007
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The rice production includes the agriculture, productive, and distribution process. There are the need of the integral analysis, with the purpose of improve their efficient and competitively. In this contex are presented improvements that impact in the production and productivity in milling rice sited in Arequipa region. For that is making a productive process diagnostic, a benchmarking with the sector enterprises, and the introduction of more celan production concepts.
7
artículo
Publicado 1995
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It tries to provide a global vision of how the environmental issue is being handled by the government and businessmen of Peru, as well as to warn about the consequences that the current trend can bring for the development of the country. It maintains that, although the Environmental Code was promulgated, its scope was moderated shortly afterwards through other legal instruments aimed at promoting investment. In the same way, it is affirmed that the creation of a rector, the National Environment Council, will not be a guarantee for the solution of environmental problems either. On the other hand, the very little importance that Peruvian managers give to the preservation of the environment in comparison with those of other countries stands out. Finally, it is affirmed that in order to care the natural heritage, it is necessary to become aware of the complementarity between development and ...
8
artículo
Publicado 2001
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The present work deals with the proposed treatment scheme for the recovery of PVC and PET using mineral processing operations such as: size reduction. Separation by dense means, alkaline treatment and flotation. The results achieved at the laboratory level indicate that 95% of PVC and 97% of PET can be recovered from the selected sample of plastic containers collected in a residual sector of the city of Bucaramanga, Colombia.
9
artículo
Publicado 2001
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The present work deals with the proposed treatment scheme for the recovery of PVC and PET using mineral processing operations such as: size reduction. Separation by dense means, alkaline treatment and flotation. The results achieved at the laboratory level indicate that 95% of PVC and 97% of PET can be recovered from the selected sample of plastic containers collected in a residual sector of the city of Bucaramanga, Colombia.
10
artículo
In the context of clean technologies is not only important to maximize production , minimize costs, but also not pollute the environment , it is for that reason we must develop basic research leading to mitigate SO2 to prevent air pollution. Direct reduction of sulfides is of interest in the metallurgical field for the base metal , using a desulfurizer agent ( CaO, CaCO3 and Na2CO3) , this being a friendly metal production route. In this paper , we show the results of research in the direct reduction of chalcopyrite with carbon in the presence of lime, as a possibility to produce copper from a sulfide avoiding air pollution. ; Also their effect on the reacted fraction and temperature the reaction rate , reaction time , molar ratios of reactants : the effect of the variables involved in the carbothermic reduction was studied . Besides modeling the reduction kinetics of chalcopyrite descri...
11
artículo
In the context of clean technologies is not only important to maximize production , minimize costs, but also not pollute the environment , it is for that reason we must develop basic research leading to mitigate SO2 to prevent air pollution. Direct reduction of sulfides is of interest in the metallurgical field for the base metal , using a desulfurizer agent ( CaO, CaCO3 and Na2CO3) , this being a friendly metal production route. In this paper , we show the results of research in the direct reduction of chalcopyrite with carbon in the presence of lime, as a possibility to produce copper from a sulfide avoiding air pollution. ; Also their effect on the reacted fraction and temperature the reaction rate , reaction time , molar ratios of reactants : the effect of the variables involved in the carbothermic reduction was studied . Besides modeling the reduction kinetics of chalcopyrite descri...
12
artículo
Publicado 2022
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The objective of this work is the design of a prototype of a pneumatic centrifugal concentrator that allows small-scale mining that takes place in desert and isolated places, to process ultrafine gold minerals in situ, cleanly, without the use of water and chemical reagents. A mathematical model based on the physico-phenomenological analysis of the differential sedimentation separation mechanism was applied in a film of laminar flow fluid, to determine the particle trajectory inside the bowl of the centrifugal concentrator as a function of the variables of bowl geometry, operating variables and physical characteristics of the particle and fluid. The simulations carried out showed a remarkable effect of the use of air instead of water on the trajectory of the particles within the fluid film. The results also showed that the capacity of the concentrator for the separation of particles by d...
13
artículo
Publicado 2000
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In recent years, technologies are being developed to treat acid mine drainage ( AMD ) , rock drainage (ARD ) and other effluents which are causing environmental pollution, both in water and soil . International environmental regulations today are quite demanding , since the current priority is the preservation of the environment. Currently has been developing terminology SBR secuential batch reactor describing a group of variable volume systems for activated sludge treatment , where the processes of sedimentation, aeration and clarification are performed in the same reactor. In the SBR happen sequentially in time different processes of equalization, aeration and clarification. This added to the biomass technology allows treatment of a wide range of metallic and organic compounds. SBR is successfully applied in USA and Canada hundreds of industrial plants. In this context we construct the...
14
artículo
Publicado 2000
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En los últimos años se están desarrollando tecnologías para el tratamiento de drenajes ácidos (AMD), drenaje de rocas (ARD) y otros efluentes que están causando contaminación ambiental, tanto de aguas como de suelos. Las normativas medioambientales internacionales en la actualidad son bastante exigentes, dado que la prioridad actual es la preservación del medio ambiente. Actualmente se ha venido desarrollando la terminología SBR secuential batch reactor que describe un grupo de sistemas de volumen variable para el tratamiento de lodos activados, donde los procesos de sedimentación, aireación y clarificación se realizan en un mismo reactor. En el SBR suceden en forma secuencial en tiempo diferentes procesos de ecualización, aireación y clarificación. Esto sumado a la tecnología de biomasa permite el tratamiento de un gran espectro de compuestos metálicos y orgánicos. SBR...
15
artículo
Publicado 1995
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It tries to provide a global vision of how the environmental issue is being handled by the government and businessmen of Peru, as well as to warn about the consequences that the current trend can bring for the development of the country. It maintains that, although the Environmental Code was promulgated, its scope was moderated shortly afterwards through other legal instruments aimed at promoting investment. In the same way, it is affirmed that the creation of a rector, the National Environment Council, will not be a guarantee for the solution of environmental problems either. On the other hand, the very little importance that Peruvian managers give to the preservation of the environment in comparison with those of other countries stands out. Finally, it is affirmed that in order to care the natural heritage, it is necessary to become aware of the complementarity between development and ...
16
artículo
Publicado 1999
Enlace
Enlace
Advanced strategies for the design of clean technologies are characterized by reducing waste emissions, reducing their generation at the source itself and implementing measures to reduce water consumption, recover material and energy resources through recycling and integration of processes and an adequate selection of raw materials. Along with this, emphasis has been placed on the development of effective environmental management practices. [1] The design of clean processes is based on the use of classical engineering tools, to conceive a production scheme that considers both technical-economic and environmental aspects. These objectives are compatible, since the environmental impact can, in part, be reduced by increasing the overall productivity of the process. In many cases, modifications with low capital requirements have led to significant increases in productivity and a reduction in...
17
artículo
Publicado 1999
Enlace
Enlace
Advanced strategies for the design of clean technologies are characterized by reducing waste emissions, reducing their generation at the source itself and implementing measures to reduce water consumption, recover material and energy resources through recycling and integration of processes and an adequate selection of raw materials. Along with this, emphasis has been placed on the development of effective environmental management practices. [1] The design of clean processes is based on the use of classical engineering tools, to conceive a production scheme that considers both technical-economic and environmental aspects. These objectives are compatible, since the environmental impact can, in part, be reduced by increasing the overall productivity of the process. In many cases, modifications with low capital requirements have led to significant increases in productivity and a reduction in...
18
artículo
Publicado 2001
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Enlace
The present work is an effort to achieve an industrial eco-efficiency reducing the direct and indirect environmental impacts present in the industrial refining of soybean oil, the use of the neutralizing agent of potassium hydroxide is proposed instead of what is currently being used, which is sodium hydroxide, and in this way eliminate the liquid tributary that is poured into the public network causing a negative environmental impact on the water bodies and the sewer system; This adverse situation for the environment will revert into something favorable for the ecosystem. For this, a physicochemical treatment will be given to the tributary, transforming it into a liquid fertilizer that can be used to provide nutrients to the cultivated soils; Other environmental advantages that would be achieved are the following: a better quality soybean oil for edible use when leaving this refining st...
19
artículo
Publicado 2001
Enlace
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The present work is an effort to achieve an industrial eco-efficiency reducing the direct and indirect environmental impacts present in the industrial refining of soybean oil, the use of the neutralizing agent of potassium hydroxide is proposed instead of what is currently being used, which is sodium hydroxide, and in this way eliminate the liquid tributary that is poured into the public network causing a negative environmental impact on the water bodies and the sewer system; This adverse situation for the environment will revert into something favorable for the ecosystem. For this, a physicochemical treatment will be given to the tributary, transforming it into a liquid fertilizer that can be used to provide nutrients to the cultivated soils; Other environmental advantages that would be achieved are the following: a better quality soybean oil for edible use when leaving this refining st...
20
artículo
Publicado 2001
Enlace
Enlace
Actualmente se están desarrollando tecnologías para el tratamiento de drenajes ácidos de mina (DAM), drenaje de rocas (ARD) y otros efluentes industriales, que están causando contaminación de aguas así como de suelos. El drenaje ácido natural es uno de los focos de contaminación ambiental de las cuencas nacionales y por ello es preciso buscar las tecnologías apropiadas para su abatimiento a las condiciones ambientales convenientes. Las tecnologías ecológicamente racionales protegen al medio ambiente, son menos contaminantes, utilizan todos los recursos en forma más sostenible, reciclan una mayor porción de sus desechos y productos y tratan los desechos residuales en forma más aceptable que las tecnologías que han venido a sustituir. En el presente trabajo mostramos el estudio experimental de pruebas de rocas ácidas en columnas de percolación, en el cual tratamos de repro...
