Download or read book Significant Dust Dispersion Models for Mining Operations written by W. R. Reed and published by Createspace Independent Publishing Platform. This book was released on 2005-09-30 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the significant dust dispersion models that are pertinent to the mining industry in an effort to highlight past and current dust modeling exercises.
Download or read book Significant Dust Dipsersion Models for Mining Operations written by William Robert Reed and published by . This book was released on 2005 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three Dimensional Computational Fluid Dynamics Models of Fugitive Dust Dispersion in High latitude Open pit Mines written by Taraprasad Bhowmick and published by . This book was released on 2015 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arctic region contains vast mineral resources and mining of these resources is a major activity in several countries, including the United States. With the advancement of open-pit mining technology, the depth to which minerals can be profitably mined has increased, resulting in deeper pits than ever before. This increase in depth has several inherent challenges for mining operations. The ventilation of an open-pit mine is mostly dependent on natural airflow patterns. The dispersion behavior of the pollutants generated in a mine is also dependent on the atmospheric conditions. The control of fugitive dust in high-latitude open-pit mines is challenging due to unique atmospheric phenomena resulting in complicated flow regimes as well as atmospheric inversion due to the lack of adequate insolation during prolonged winter seasons. The development of a computational fluid dynamics (CFD) model of an open-pit mine is challenging due to the presence of several sharp and irregular features at the pit surface. A good quality mesh of the model domain is a prerequisite for convergence in solution. Besides good quality meshing, choices of various simulation setup parameters have significant impact in convergence or divergence of the simulation. Appropriate choices of simulation type, boundary and initial conditions, time stepping and various convergence criteria are important for realistic simulation of a model domain. Environmental conditions in the mine vary from season to season; hence, fugitive dust dispersion simulations using a commercial CFD software are conducted for various seasonal conditions along with several cloud conditions. Clear sky and cloudy sky conditions result in different radiative and turbulent energy fluxes. In each scenario, fugitive dust particles varying in size (PM0.1 to PM10) and concentrations are generated at various locations of the selected mine. The simulation results predict a speedy removal of fugitive dust in summer. However, during winter, the presence of an inversion layer in the open-pit results in extensive retention of fugitive dust. For removal of the atmospheric inversion during winter, it is observed that the presence of cloud cover and convective wind are the most important factors.
Download or read book Dust Dispersion Modeling For Opencast Mines written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mining operations generates substantial quantities of airborne respirable dust, which leads to the development of lung disease in mine workers. Coal worker's pneumoconiosis and silicosis are lung diseases that have adversely impacted the health of thousands of mine workers. The increasing trend of opencast mining leads to release of huge amount of dust. These air borne dust particles, generally below 100 micron in size, are environmentally nuisance and cause health hazards as an ill effect of mining activities. Opencast extraction activities like drilling, blasting, material handling and transport are a potential source of air pollution. Therefore, a detailed study on emission sources and quantification of pollutant concentration by means of dispersion modeling is required to access the environmental impact of a opencast mine. On the basis of the predicted increments to air pollutant concentrations, an effective mitigation and environmental plan can be devised for sensitive areas. In the present study, Air quality modeling has been attempted using AERMOD. Line source & Volume source modeling has been carried out for haul road and open pit respectively. From the modeling exercise, dust concentrations at certain receptor locations have been predicted and it was found that the resultant SPM level at these locations will remain within the NAAQS norms.
Download or read book Modeling Fugitive Dust Impacts from Surface Coal Mining Operations Phase III written by Jawad S. Touma and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling Fugitive Dust Impacts from Surface Coal Mining Operations written by Chatten Cowherd and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dust Control Handbook for Industrial Minerals Mining and Processing written by Andrew B. Andrew B. Cecala and published by CreateSpace. This book was released on 2015-05-09 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout the mining and processing of minerals, the mined ore undergoes a number of crushing, grinding, cleaning, drying, and product sizing operations as it is processed into a marketable commodity. These operations are highly mechanized, and both individually and collectively these processes can generate large amounts of dust. If control technologies are inadequate, hazardous levels of respirable dust may be liberated into the work environment, potentially exposing workers. Accordingly, federal regulations are in place to limit the respirable dust exposure of mine workers. Engineering controls are implemented in mining operations in an effort to reduce dust generation and limit worker exposure.
Download or read book Development Of A Dust Deposition Forecast Model For A Mine Tailings Impoundment written by Michael Kelly Stovern and published by . This book was released on 2014 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind erosion, transport and deposition of particulate matter can have significant impacts on the environment. It is observed that about 40% of the global land area and 30% of the earth's population lives in semiarid environments which are especially susceptible to wind erosion and airborne transport of contaminants. With the increased desertification caused by land use changes, anthropogenic activities and projected climate change impacts windblown dust will likely become more significant. An important anthropogenic source of windblown dust in this region is associated with mining operations including tailings impoundments. Tailings are especially susceptible to erosion due to their fine grain composition, lack of vegetative coverage and high height compared to the surrounding topography. This study is focused on emissions, dispersion and deposition of windblown dust from the Iron King mine tailings in Dewey-Humboldt, Arizona, a Superfund site. The tailings impoundment is heavily contaminated with lead and arsenic and is located directly adjacent to the town of Dewey-Humboldt. The study includes in situ field measurements, computational fluid dynamic modeling and the development of a windblown dust deposition forecasting model that predicts deposition patterns of dust originating from the tailings impoundment. Two instrumented eddy flux towers were setup on the tailings impoundment to monitor the aeolian and meteorological conditions. The in situ observations were used in conjunction with a computational fluid dynamic (CFD) model to simulate the transport of windblown dust from the mine tailings to the surrounding region. The CFD model simulations include gaseous plume dispersion to simulate the transport of the fine aerosols, while individual particle transport was used to track the trajectories of larger particles and to monitor their deposition locations. The CFD simulations were used to estimate deposition of tailings dust and identify topographic mechanisms that influence deposition. Simulation results indicated that particles preferentially deposit in regions of topographic upslope. In addition, turbulent wind fields enhanced deposition in the wake region downwind of the tailings. This study also describes a deposition forecasting model (DFM) that can be used to forecast the transport and deposition of windblown dust originating from a mine tailings impoundment. The DFM uses in situ observations from the tailings and theoretical simulations of aerosol transport to parameterize the model. The model was verified through the use of inverted-disc deposition samplers. The deposition forecasting model was initialized using data from an operational Weather Research and Forecasting (WRF) model and the forecast deposition patterns were compared to the inverted-disc samples through gravimetric, chemical composition and lead isotopic analysis. The DFM was verified over several month-long observing periods by comparing transects of arsenic and lead tracers measured by the samplers to the DFM PM2-- forecast. Results from the sampling periods indicated that the DFM was able to accurately capture the regional deposition patterns of the tailings dust up to 1 km. Lead isotopes were used for source apportionment and showed spatial patterns consistent with the DFM and the observed weather conditions. By providing reasonably accurate estimates of contaminant deposition rates, the DFM can improve the assessment of human health impacts caused by windblown dust from the Iron King tailings impoundment.
Download or read book Dispersion of Dust Deposits by Blasts of Air written by J. G. Dawes and published by . This book was released on 1952 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Dispersion of Dust by Blast written by Safety in Mines Research Establishment (Great Britain) and published by . This book was released on 1952 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Impact of Mining and Mineral Processing written by Ravi Jain and published by Butterworth-Heinemann. This book was released on 2015-08-03 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental Impact of Mining and Mineral Processing: Management, Monitoring, and Auditing Strategies covers all the aspects related to mining and the environment, including environmental assessment at the early planning stages, environmental management during mine operation, and the identification of major impacts. Technologies for the treatment of mining, mineral processing, and metallurgical wastes are also covered, along with environmental management of mining wastes, including disposal options and the treatment of mining effluents. Presents a systematic approach for environmental assessment of mining and mineral processing projects Provides expert advice for the implementation of environmental management systems that are unique to the mining industry Effectively addresses a number of environmental challenges, including air quality, water quality, acid mine drainage, and land and economic impacts Explains the latest in environmental monitoring and control systems to limit the environmental impact of mining and processing operations
Download or read book Dispersion of Dust Deposits by Blasts of Air written by Safety in Mines Research Establishment (Great Britain) and published by . This book was released on 1952 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Methods in Multiphase Flow IV written by A.A. Mammoli and published by WIT Press. This book was released on 2007-05-11 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid Dynamics is one of the most important topics of applied mathematics and physics. Together with complex flows and turbulence, multiphase flows remains one of the most challenging areas of computational mechanics, and even seemingly simple problems remain unsolved to date. Multiphase flows are found in all areas of technology, at all length scales and flow regimes. The fluids involved can be compressible or incompressible, linear or nonlinear. Because of the complexity of the problem, it is often essential to utilize advanced computational and experimental methods to solve the complex equations that describe them. Challenges in these simulations include nonlinear fluids, treating drop breakup and coalescence, characterizing phase structures, and many others.This volume brings together work presented at the Fourth International Conference on Computational and Experimental Methods in Multiphase and Complex Flows. Featured topics include: Suspensions; Bubble and Drop Dynamics; Flow in Porous Media; Interfaces; Turbulent Flow; Injectors and Nozzles; Particle Image Velocimetry; Macroscale Constitutive Models; Large Eddy Simulation; Finite Volumes; Interface Tracking Methods; Biological Flows; Environmental Multiphase Flow; Phase Changes and Stochastic Modelling.
Download or read book Chemical Dust Suppression Technology and Its Applications in Mines Open pit Mines written by Yuan Wang and published by Springer Nature. This book was released on 2022-01-12 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the study of chemical dust suppression in mine dust pollution control by means of theories, experiments, computer simulation, and case application, aiming at providing chemical dust suppression solutions for mining worksites. It has seven chapters, including the following contents: (1) introduces fundamental theories and applications of chemical dust suppression, analyzes the dust source intensity of worksites and the mechanisms of dust generation, and summarizes the dust control measures for different mining worksites. (2) According to the mechanisms of dust generation in different mining worksites, targeted dust suppressants were developed. Through optimization by monomer experiment and orthogonal experiment, the optimum formula of different types of dust suppressants was obtained, and its properties were characterized. (3) The dust suppressant field application process was introduced, and the economic benefits were analyzed. This book is expected to provide valuable references both for researchers and engineering technicians engaged in environmental engineering, safety engineering, occupational health, and mining metallurgical engineering, and it also serves as a textbook for graduate students in above disciplines.
Download or read book Dispersion of Dust in a Channel by a Turbulent Gas Stream written by Charles C. Hwang and published by . This book was released on 1974 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book UAV Sensors for Environmental Monitoring written by Felipe Gonzalez Toro and published by MDPI. This book was released on 2018-03-05 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "UAV Sensors for Environmental Monitoring" that was published in Sensors
Download or read book A CFD Analysis of the Flow of Fine Particles in a Turbulent Medium and Controls for Dust in Longwall Mining written by Akshat Chandna and published by . This book was released on 2015 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Worker exposure to coal dust in underground mines remains a major health hazard. This research has: 1) Analyzed the wetting characteristics of less than 10 micron dust particles using a novel micro-emulsion technology (MET) at bench scale and prototype scale with emphasis on agglomeration of dust particles, and 2) Simulate airflow and dust dispersion patterns on a longwall mining face using CFD modeling techniques to compare the current and proposed spatial distributions of water sprays around a longwall shearer. With the “Final Dust Rule” adopted by MSHA in 2014 and slated to go into full effect August 16, 2016, this research is a significant contribution to the coal industry. A suitable micro-emulsion containing 0.2% oil and 0.0125% didodecyl-dimethyl-ammonium bromide (DDAB) was identified. For assessing the wettability of coal dusts, a slightly modified version of “Fixed Time Wettability” or FTW (Chugh et al., 2004) was employed. These wettability tests however, did not yield true wettability using the MET. An analysis for both unwetted and wetted portions of coal dust using particle size distribution curves (PSD) confirmed agglomeration when treated with the emulsion. For the unwetted portion, 96.6% of the particles had sizes greater than 25 ?m after treatment with MET. Similar data for wetted dust was 100%. Experimental studies in a 4 ft x 4ft x 10 ft chamber showed 12-15% improvement in respirable dust when using MET as compared to water alone. Validated computational fluid dynamics (CFD) models were used to study airflow patterns and the interaction between sprays and airflow for designing both engineering and administrative controls around a longwall face. Two important zones – low air velocity (LAV) and recirculation (RC) – were identified around the model of a longwall face. These zones were located: 1) Behind the headgate drum and 2) Above the shearer chassis. Analysis of a modified geometric configuration of sprays on the shearer chassis showed improved coverage for wetting the dust on the longwall face. Numerical modeling comparisons were made between current spray systems and spray systems proposed by Dr. Y. P. Chugh using the concepts of “Continuous and Discrete Phase Modeling”. Analyses included changes in airflow patterns caused by spray systems and dust dispersion tracks generated from the cutting face. Chugh’s spray system was able to effectively eliminate RC zones existing above the shearer body, thereby minimizing the extent to which coal dust enters the walkway of the longwall face where workers are located. The proposed spray system used concepts of multiple wetting points for dust, air-locks, and venturi to wet the dust and direct the dust-laden air from mine workers. These improvements can be used in longwall mines as engineering controls for meeting new dust control standards.
