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Full-Text Articles in Mining Engineering

The Effect Of Conditioning On The Flotation Of Pyrrhotite In The Presence Of Chlorite, Yanfei Chen, Qing Shi, Qimeng Feng, Yiping Lu, Wencai Zhang Jul 2017

The Effect Of Conditioning On The Flotation Of Pyrrhotite In The Presence Of Chlorite, Yanfei Chen, Qing Shi, Qimeng Feng, Yiping Lu, Wencai Zhang

Mining Engineering Faculty Publications

The influence of conditioning on the flotation of pyrrhotite in the presence of chlorite was investigated through flotation tests, sedimentation tests, and X-ray photoelectron spectroscopy (XPS) analysis. The flotation results show that chlorite slimes dramatically impair the flotation of pyrrhotite. Sedimentation and flotation tests reveal that conditioning can effectively remove chlorite slimes from pyrrhotite surfaces, resulting in an enhanced flotation recovery of pyrrhotite. When mixed minerals were conditioned under the natural atmosphere, a faster conditioning speed and longer conditioning time decreased the flotation recovery of pyrrhotite. However, when mixed minerals were conditioned under a nitrogen atmosphere, a more intensive conditioning ...


Estimating The Effects Of Blasting Vibrations On The High-Wall Stability, Abhinav Sharma Jan 2017

Estimating The Effects Of Blasting Vibrations On The High-Wall Stability, Abhinav Sharma

Theses and Dissertations--Mining Engineering

The stability of the high-walls is one of the major concerns for open pit mines. Among the various factors affecting the stability of high-walls, blast vibrations can be an important one. In general, worldwide the established respective government regulations and industry standards are used as guidance to determine the maximum recommended levels of the peak particle velocity and frequency from the blast to avoid any effects on the structures around the mining project. However, most of the regulations are meant for buildings or houses and do not concern high-walls.

This thesis investigates the response of high-walls under the effects of ...


Fundamental Improvement In The Tribocharging Separation Process For Upgrading Coal, Jinxiang Chen Jan 2017

Fundamental Improvement In The Tribocharging Separation Process For Upgrading Coal, Jinxiang Chen

Theses and Dissertations--Mining Engineering

Triboelectrostatic separation is a physical separation technique that is based on surface electronic property differences among minerals to achieve a separation. Minerals have different surface conductivities and electron affinities. They are charged differently in quantity and/or polarity after a tribocharging process. Particles with different surface charges move discretely under external electric field produce a separation. Electrostatic separation is a dry mineral processing method that does not require any water or chemical reagents. It can greatly simplify the processing circuit and reduce operating cost. Additionally, problems caused by water in conventional wet mineral processing such as water freezing, dewatering, water ...


Calculation Of The Edge Effect Offset For High Extraction Coal Panels, Joshua Hescock Jan 2017

Calculation Of The Edge Effect Offset For High Extraction Coal Panels, Joshua Hescock

Theses and Dissertations--Mining Engineering

The Surface Deformation Prediction System (SDPS) program has been developed as an engineering tool for the prediction of subsidence deformation indices through the implementation of an influence function. SDPS provides reliable predictions of mining induced surface displacements, strains, and tilt for varying surface topography. One of the key aspects in obtaining reliable ground deformation prediction is the determination of the edge effect offset. The value assigned to the edge effect corresponds to a virtual offsetting of boundary lines delineating the extracted panel to allow for roof cantilevering over the mined out area.

The objective of this thesis is to describe ...


Laboratory Performance Comparison Of Vortecone Inertial Dust Scrubber To Flooded-Bed Dust Scrubber, Adam J. Levy Jan 2017

Laboratory Performance Comparison Of Vortecone Inertial Dust Scrubber To Flooded-Bed Dust Scrubber, Adam J. Levy

Theses and Dissertations--Mining Engineering

Increasing incidence of Black Lung disease in miners since the early 1990s has concerned law makers and the mining industry. New regulations promulgated by MSHA in 2014 lowered the permissible limit of dust exposure of underground workers. The hazards of respirable coal dust have been common knowledge throughout the mining industry since the enactment of the 1969 Federal Coal Mine Health and Safety Act, and many administrative controls have been put in place since its enactment.

The purpose of this thesis is to analyze the performance of a Vortecone scrubber, used in the automotive industry to remove paint overspray from ...


Surface Chemisty Study Of Monazite Flotation In Coal Refuse Systems, Wencai Zhang Jan 2017

Surface Chemisty Study Of Monazite Flotation In Coal Refuse Systems, Wencai Zhang

Theses and Dissertations--Mining Engineering

Rare earth mineral recovery from alternative resources such as coal and coal byproducts is increasingly important to provide an opportunity for economic recovery from U.S. sources. Currently, China produces the majority of the 149,000 tons of rare earth elements used annually worldwide of which the U.S. imports 11% or around 16,000 tons. There are no significant mining operations producing rare earth elements in the U.S. However, there are many U.S. sources containing rare earth minerals such as monazite including heavy mineral sand and phosphate operations. Monazite mineral particles of a few microns have also ...


Assessment Of Potential Impacts To Subsurface Bodies Of Water Due To Underground Coal Mining, Gabriel Bode-Jimenez Jan 2017

Assessment Of Potential Impacts To Subsurface Bodies Of Water Due To Underground Coal Mining, Gabriel Bode-Jimenez

Theses and Dissertations--Mining Engineering

Underground coal mining operations induce ground movements, which may impact overlying hydrogeologic systems. Potential impacts mainly include changes in the hydraulic conductivity of overlying strata, decreasing of the hydraulic head and changes in water flow. The present research quantifies potential hydrogeologic impacts caused by underground mining through modeling of pre- and post-mining hydrogeologic systems.

Three-dimensional conceptual hydrogeologic models were constructed with the Processing Modflow for Windows software package (PMWiN). The models are based on an actual case study, but were simplified in terms of geometry and material properties. Water flow was simulated under changing hydrogeologic properties. A number of scenarios ...


Assessment Of Potential Impacts To Surface And Subsurface Water Bodies Due To Longwall Mining, Christopher R. Newman, Zacharias Agioutantis, Gabriel Boede Jimenez Leon Jan 2017

Assessment Of Potential Impacts To Surface And Subsurface Water Bodies Due To Longwall Mining, Christopher R. Newman, Zacharias Agioutantis, Gabriel Boede Jimenez Leon

Mining Engineering Faculty Publications

Ground movements due to longwall mining operations have the potential to damage the hydrological balance within as well as outside the mine permit area in the form of increased surface ponding and changes to hydrogeological properties. Recently, the Office of Surface Mining, Reclamation and Enforcement (OSMRE) in the USA, has completed a public comment period on a newly proposed rule for the protection of streams and groundwater from adverse impacts of surface and underground mining operations (80 FR 44435). With increased community and regulatory focus on mining operations and their potential to adversely affect streams and groundwater, now there is ...