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134 full-text articles. Page 1 of 2.

Study On Deterioration Mechanism And Prevention And Curing Techniques Of An Rc Bunker, Henglin Lv, Haijian Xie, Shuchun Zhou, Sun Lei 2014 Purdue University

Study On Deterioration Mechanism And Prevention And Curing Techniques Of An Rc Bunker, Henglin Lv, Haijian Xie, Shuchun Zhou, Sun Lei

International Conference on Durability of Concrete Structures

In the coal mining industrial environment, the materials of RC bunkers suffer from serious aging problems. The cracking and deterioration of concrete and the corrosion of steel reinforcement lead to a degeneration of structural performance and a decline of structural reliability. In this paper, based on on-site detection and coal mining ground industrial environment, the deterioration characteristics of RC bunkers were tested. The investigation involved the apparent characteristics, carbonized depth, compression strength of concrete, reinforcement distribution and cover thickness, corrosion rate and mechanical properties of reinforcement, decline degree of bunkers, and so on. Then a design review check was done ...


Pressure Hydrometallurgy, Fathi Habashi 2014 SelectedWorks

Pressure Hydrometallurgy, Fathi Habashi

Fathi Habashi

Pressure Hydrometallurgy is a supplement to the author’s Textbook of Hydrometallugy [second edition 1999]. It is an update to the new processes described in the literature dealing with recovering metals from ores and concentrates using this technology. Great progress was made in this field that necessitated this review.


Travelling In Turkey, Fathi Habashi 2014 SelectedWorks

Travelling In Turkey, Fathi Habashi

Fathi Habashi

The peninsula that lies between the Black and Mediterranean seas, called Asia Minor by the Romans and Anatolia by the Greeks, was one of the crossroads of ancient civilizations. The fall of Constantinople in 1453 was a turning point in the history of mankind. Visits to Istanbul, Ankara, Eskisehir given together with the history of the country. Mineral resources of the country is briefly outlined.


History Of Innovation In Extractive Metallurgy, Fathi Habashi 2014 SelectedWorks

History Of Innovation In Extractive Metallurgy, Fathi Habashi

Fathi Habashi

People learned melting of ores to get metals since ancient times but the use of aqueous solutions for this purpose was introduced relatively recently in the Middle Ages. The most recent technology, however, came when electric current became available on commercial scale towards the middle of the nineteenth century. The present article records in general terms the development in pyro- , hydro-, and electrometallurgy


Catalytic Or Thermal Reversed Flow Combustion Of Coal Mine Ventilation Air Methane: What Is Better Choice And When?, Krzysztof J. Gosiewski 2014 SelectedWorks

Catalytic Or Thermal Reversed Flow Combustion Of Coal Mine Ventilation Air Methane: What Is Better Choice And When?, Krzysztof J. Gosiewski

Krzysztof Gosiewski

The paper presents a comparison of the two options of reverse flow reactors destined for the utilization of coal mine ventilation air methane by catalytic (CFRR) or thermal (TFRR) combustion. It has been shown that both solutions have advantages and drawbacks. The use of the catalyst significantly decreases reactor temperature and makes the operation becomes to be autothermal for methane concentrations lower than in TFRR (even as low as over 0.06 vol.%). On the other hand when methane is combusted, particularly if average concentration is higher than ca. 0.4 vol.% the maximum temperature in the reactor appears to ...


Metalurjiye Adanmış Bir Hayat, Fathi Habashi 2014 SelectedWorks

Metalurjiye Adanmış Bir Hayat, Fathi Habashi

Fathi Habashi

Interview


Evidence Of The Existence Of Cathodic And Anodic Zones During The Leaching Of Minerals And Metals, Fathi Habashi 2014 SelectedWorks

Evidence Of The Existence Of Cathodic And Anodic Zones During The Leaching Of Minerals And Metals, Fathi Habashi

Fathi Habashi

It is accepted worldwide that the dissolution of minerals in some cases, is an electrochemical process where anodic and cathodic reactions take place. There are many parameters, such as agent concentration, that directly affect the dissolution process. The rate of leaching of minerals may differ depending on the oxygen concentration. In this paper, the existence of anodic and cathodic zones on themineral surface during the dissolution/leaching of minerals andmetals has been presentedwith some differentworks. It isworthmentioning that a good number of published papers have experimentally demonstrated the existence of anodic and cathodic areas on the mineral surface.


Multiscale Modeling Of The Mine Ventilation System And Flow Through The Gob, William Chad Wedding 2014 University of Kentucky

Multiscale Modeling Of The Mine Ventilation System And Flow Through The Gob, William Chad Wedding

Theses and Dissertations--Mining Engineering

The following dissertation introduces the hazard of methane buildup in the gob zone, a caved region behind a retreating longwall face. This region serves as a reservoir for methane that can bleed into the mine workings. As this methane mixes with air delivered to the longwall panel, explosive concentrations of methane will be reached.

Computational fluid dynamics (CFD) is one of the many approaches to study the gob environment. Several studies in the past have researched this topic and a general approach has been developed that addresses much of the complexity of the problem. The topic of research herein presents ...


Geçmişten Günümüze Hidrometalurji Hydrometallurgy Over The Years*, Fathi Habashi 2014 SelectedWorks

Geçmişten Günümüze Hidrometalurji Hydrometallurgy Over The Years*, Fathi Habashi

Fathi Habashi

Thousands of years ago people had learned how to build furnaces and use fire to melt rocks and produce metals but the use of aqueous solutions for ore processing came much later, mainly at the time of the alchemists when acids and alkalies became known and used. Modern hydrometallurgy, however, can be traced back to the end of the 19th century when two major operations were discovered: the cyanidation process for gold and silver extraction and the Bayer process for bauxite treatment. Later, in the 1940s, a breakthrough came during the Manhattan Project in USA in connection with uranium extraction ...


Hydrometallurgy Over The Years (Geçmişten Günümüze Hidrometalurji), Fathi Habashi 2014 SelectedWorks

Hydrometallurgy Over The Years (Geçmişten Günümüze Hidrometalurji), Fathi Habashi

Fathi Habashi

Binlerce yıl önce insanlar, nasıl fırın yapacaklarını, ayaçları eritmek için ateşi nasıl kullanacaklarını ve metalleri nasıl üreteceklerini öğrenmelerine rağmen, cevherlerin zenginleştirilmesinde çözeltilerin kullanımı, asit ve bazların öğrenilip kullanıldığı simyacılar dönemine rastlamaktadır. Bununla birlikte modern hidrometalurjinin başlangıcı, iki önemli prosesin keşfedildiği 19. yüzyılın sonlarına dayandırılabilir. Bu prosesler, altın ve gümüşün çözündürülmesi için siyanür liç prosesi ve boksit cevherlerinin değerlendirilmesi için geliştirilen Bayer prosesidir. Daha sonra, 1940’larda, uranyum zenginleştirilmesi ile ilgili olarak Manhattan Projesi (ABD) bir dönüm noktası olmuştur. O tarihten itibaren, hidrometalurji giderek ilerlemekte ve hatta bazı pirometalurjik proseslerin yerinialmaktadır. Bu süreçte Kanada’nın, özellikle uranyum, nikel, kobalt ve çinko ...


Interview, Fathi Habashi 2013 SelectedWorks

Interview, Fathi Habashi

Fathi Habashi

Translation of a Turkish interview published in MEi Online


Pyrite: The Strategic Mineral That Became An Industrial Nuisance, Fathi Habashi 2013 SelectedWorks

Pyrite: The Strategic Mineral That Became An Industrial Nuisance, Fathi Habashi

Fathi Habashi

Pyrite, known since antiquity, had at one time a great strategic importance because it was the main raw material for making elemental sulfur for gun powder manufacture and for making SO2 for sulfuric acid production. However, when other sources of cheap elemental sulfur became available, pyrite not only lost its importance but became a nuisance for the metallurgical industry because of problems associated with its disposal. At present only pyrite-containing gold is treated by a variety of methods to recover gold.


Study On The Surface Chemistry Behavior Of Pyrochlore During Froth Flotation, Saeed Chehreh Chelgani 2013 Western University

Study On The Surface Chemistry Behavior Of Pyrochlore During Froth Flotation, Saeed Chehreh Chelgani

University of Western Ontario - Electronic Thesis and Dissertation Repository

Separation of pyrochlore from its associated minerals is typically accomplished by froth flotation. The surface chemistry of pyrochlore is similar to many of its associated non-value minerals. Therefore, understanding the surface chemical properties of the pyrochlore for selective pyrochlore flotation will potentially aid in the design of flotation strategies for optimized recovery. In this study, pyrochlore samples were collected from various points in the flotation scheme at the Niobec plant, Quebec, Canada. The SEM-EDX analysis revealed that pyrochlore from the Niobec deposit occurs as high and low iron varieties, and that recovery favours varieties with a lower Fe content. To ...


Energy, U.S. Department Of, Bert Chapman 2013 Purdue University

Energy, U.S. Department Of, Bert Chapman

Libraries Faculty and Staff Scholarship and Research

Provides information about the U.S. Department of Energy (DOE) and its predecessor agencies and how DOE influences federal energy policy and scientific research in the western U.S.


Mining, Uranium, Bert Chapman 2013 Purdue University

Mining, Uranium, Bert Chapman

Libraries Faculty and Staff Scholarship and Research

Provides an overview of uranium mining's role and influence in the American West with comparative information on uranium mining in foreign countries.


Borehole Localization And Detection For Mining (Orica), Samantha Becht, Thomas Duggar, Blair Emanuel, Arjun Iyer, Luis Rayas 2013 Olin College of Engineering

Borehole Localization And Detection For Mining (Orica), Samantha Becht, Thomas Duggar, Blair Emanuel, Arjun Iyer, Luis Rayas

2013 SCOPE Projects

Orica is a multinational supplier of mining chemicals and services. The Orica-Olin SCOPE team investigated opportunities for automation of dirty and dangerous tasks associated with the surface mining process, for example the blasting of existing boreholes. Our project is the first step: building an automated proof-of-principle which uses stereo vision to identify holes and moves a laser pointer over the center of each hole.


Power And Politics In Organizations, T. W. Camm 2013 Montana Tech Library

Power And Politics In Organizations, T. W. Camm

Mining Engineering

Aristotle made the observation that man is a political animal. Engineers often like to think they are above the fray when it comes to organizational politics, but most organizational theorists believe politics is a fundamental dynamic in any group. This paper examines the various ways that people use power within organizations to negotiate the political interactions in the work place.


Development Of 15 Psi Safe Haven Polycarbonate Walls For Use In Underground Coal Mines, Rex Allen Meyr Jr. 2013 University of Kentucky

Development Of 15 Psi Safe Haven Polycarbonate Walls For Use In Underground Coal Mines, Rex Allen Meyr Jr.

Theses and Dissertations--Mining Engineering

Following three major mining accidents in 2006, the MINER Act of 2006 was enacted by MSHA and required every underground coal mine to install refuge alternatives to help prevent future fatalities of trapped miners in the event of a disaster. The following research was performed in response to NIOSH’s call for the investigation into new refuge alternatives. A 15 psi safe haven polycarbonate wall for use in underground coal mines was designed and modeled using finite element modeling in ANSYS Explicit Dynamics. The successful design was tested multiple times in both half-scale and small scale using a high explosive ...


A Framework For Understanding The Public's Perspectives Of Mining Applied To The Kentucky Coal Industry, Joshua M. Hoffman 2013 University of Kentucky

A Framework For Understanding The Public's Perspectives Of Mining Applied To The Kentucky Coal Industry, Joshua M. Hoffman

Theses and Dissertations--Mining Engineering

People’s perceptions of mining are heavily based on the media they consume and the messages therein. News outlets ordinarily report on mining only when there is an accident or environmental concern. When messages that the public is exposed to are negative, it is no wonder that there are negative perceptions about mining.

Current public relations campaigns on the behalf of specific companies or select sectors do exist; however, this is often a reactionary move in response to recent shifts in the socio-political environment. The details of these campaigns are often tied up in proprietary information or withheld by public ...


Characterizing The Variability In Respirable Dust Exposure Using Johnson Transformation And Re-Examining 2010 Proposed Changes To The U.S. Underground Coal Mine Dust Standard, Al I. Khan 2013 University of Kentucky

Characterizing The Variability In Respirable Dust Exposure Using Johnson Transformation And Re-Examining 2010 Proposed Changes To The U.S. Underground Coal Mine Dust Standard, Al I. Khan

Theses and Dissertations--Mining Engineering

Coal workers’ pneumoconiosis (CWP), commonly referred to as black lung, is a chronic lung disease that results from the inhalation and deposition of coal dust in the lungs. While this disease continues to afflict coal miners, its prevalence has steadily declined over three decades since 1970. Based on a voluntary X-ray surveillance program, conducted by the National Institute for Occupational Safety and Health (NIOSH), this downward trend, however, ended in 2000 and has actually begun to rise. The Mine Safety and Health Administration (MSHA) instituted a Comprehensive Initiative to “End Black Lung” to combat the reported upturn in black lung ...


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