Molecular Mechanism Study On The Effect Of Nonionic Surfactants With Different Degrees Of Ethoxylation On The Wettability Of Anthracite,
2023
Missouri University of Science and Technology
Molecular Mechanism Study On The Effect Of Nonionic Surfactants With Different Degrees Of Ethoxylation On The Wettability Of Anthracite, Xuanlai Chen, Guochao Yan, You Zhou, Guang Xu, Xuyang Bai, Jiajun Li
Mining Engineering Faculty Research & Creative Works
A serious risk to the production safety of coal mines is coal dust. The wettability of coal may be successfully changed by adding surfactants to water. However, the creation of very effective dust suppressants is constrained by the lack of knowledge about the microscopic interaction mechanism between coal dust and surfactants. In this investigation, we explained macroscopic experimental phenomena from a molecular perspective. The lauryl polyoxyethylene ethers (C12 (EO)n, n = 7,15,23) were selected. The macromolecular model of anthracite with 55 different components was constructed. Surface tension experiments and hydrophilic lipophilic balance (HLB) calculations showed that the ability of surface …
Molecular Mechanism Study On The Effect Of Nonionic Surfactants With Different Degrees Of Ethoxylation On The Wettability Of Anthracite,
2023
Missouri University of Science and Technology
Molecular Mechanism Study On The Effect Of Nonionic Surfactants With Different Degrees Of Ethoxylation On The Wettability Of Anthracite, Xuanlai Chen, Guochao Yan, You Zhou, Guang Xu, Xuyang Bai, Jiajun Li
Mining Engineering Faculty Research & Creative Works
A serious risk to the production safety of coal mines is coal dust. The wettability of coal may be successfully changed by adding surfactants to water. However, the creation of very effective dust suppressants is constrained by the lack of knowledge about the microscopic interaction mechanism between coal dust and surfactants. In this investigation, we explained macroscopic experimental phenomena from a molecular perspective. The lauryl polyoxyethylene ethers (C12 (EO)n, n = 7,15,23) were selected. The macromolecular model of anthracite with 55 different components was constructed. Surface tension experiments and hydrophilic lipophilic balance (HLB) calculations showed that the ability of surface …
Molecular Mechanism Study On The Effect Of Nonionic Surfactants With Different Degrees Of Ethoxylation On The Wettability Of Anthracite,
2023
Missouri University of Science and Technology
Molecular Mechanism Study On The Effect Of Nonionic Surfactants With Different Degrees Of Ethoxylation On The Wettability Of Anthracite, Xuanlai Chen, Guochao Yan, You Zhou, Guang Xu, Xuyang Bai, Jiajun Li
Mining Engineering Faculty Research & Creative Works
A serious risk to the production safety of coal mines is coal dust. The wettability of coal may be successfully changed by adding surfactants to water. However, the creation of very effective dust suppressants is constrained by the lack of knowledge about the microscopic interaction mechanism between coal dust and surfactants. In this investigation, we explained macroscopic experimental phenomena from a molecular perspective. The lauryl polyoxyethylene ethers (C12 (EO)n, n = 7,15,23) were selected. The macromolecular model of anthracite with 55 different components was constructed. Surface tension experiments and hydrophilic lipophilic balance (HLB) calculations showed that the …
Effect Of Quantitative Textural Specifications On Vickers Hardness Of Limestones,
2023
Missouri University of Science and Technology
Effect Of Quantitative Textural Specifications On Vickers Hardness Of Limestones, Sasan Ghorbani, Seyed Hadi Hoseinie, Ebrahim Ghasemi, Taghi Sherizadeh
Mining Engineering Faculty Research & Creative Works
It is well-known that the indentation hardness property is influenced by micro-fabric characteristics. The effect of textural characteristics on Vickers indentation hardness is attempted to be interpreted in this research. For this purpose, 12 fresh limestone samples from various quarries were tested to determine the Vickers hardness. Thereafter, quantitative textural parameters were identified and characterized using image processing techniques and micro-fabric analysis based on microphotographs of thin sections. Microphotographs of the thin sections were reviewed and digital boundaries of the grains were clarified and drawn. After preparation and filtering of the digitized thin sections, four basic properties of each grain, …
Influence Of The Preparation Technique On The Magnetic Characteristics Of Ε-Fe2o3-Based Composites,
2022
Sankt-Peterburgskij Gosudarstvennyj Elektrotehniceskij Universitet
Influence Of The Preparation Technique On The Magnetic Characteristics Of Ε-Fe2o3-Based Composites, Dmitriy O. Testov, Kamil G. Gareev, Ivan K. Khmelnitskiy, Andrei Kosterov, Leonid Surovitskii, Victor V. Luchinin
Michigan Tech Publications
ε-Fe2O3 is an iron(III) oxide polymorph attracting an increasing interest due to its unique magnetic properties combining extremely high coercivity and relatively large saturation magnetization. We review existing methods for the ε-Fe2O3 synthesis focusing on synthesis speed, repeatability, manufacturability and purity of the final product. Samples of ε-Fe2O3 have been synthesized using the two methods that appear the most promising: silica gel impregnation and microemulsion. In both cases, ε-Fe2O3 and α-Fe2O3 are present in the final product as attested by X-ray diffraction patterns and magnetic properties (maximum coercive force at 300 K~1 Tesla). Two different precursors, iron(III) nitrate and iron(II) …
Dynamic Rbi With Central Difference Method Approach In Calculation Of Uniform Corrosion Rate: A Casestudy On Gas Pipelines,
2022
Departemen Metalurgi dan Material, Fakultas Teknik, Universitas Indonesia, Depok 16424, Indonesia
Dynamic Rbi With Central Difference Method Approach In Calculation Of Uniform Corrosion Rate: A Casestudy On Gas Pipelines, M.Riefqi Dwi Alviansyah, Fernanda Hartoyo, Zahra Nadia Nurullia, Ari Kurniawan
Journal of Materials Exploration and Findings (JMEF)
The oil and gas industry generally uses a piping system to drain fluids. Even though the pipes used have been well designed, the use of pipes as a means of fluid transportation still provides the possibility of failure that can occur at any time, one of which is due to uniform corrosion. The use of standard Risk Based Inspection (RBI) according to the API RBI 581 document has been widely used to anticipate potential failures to pipe components. The use of standard RBI can reduce the risk of failure significantly. Because the standard RBI considers the component risk value to …
Shock Wave Formation From Head-On Collision Of Two Subsonic Vortex Rings,
2022
Missouri University of Science and Technology
Shock Wave Formation From Head-On Collision Of Two Subsonic Vortex Rings, Rachel L. Bauer, Cody J. Thomas, Everett V.P. Baker, Emily M. Johnson, Kelly R. Williams, Martin J. Langenderfer, Catherine E. Johnson
Mining Engineering Faculty Research & Creative Works
Vortex ring collisions have attracted intense interest in both water and air studies (Baird in Proc R Soc Lond Ser Math Phys Sci 409:59-65, 1987, Poudel et al. in Phys Fluids 33:096105, 2021, Lim and Nickels in Nature 357:225, 1992, New et al. in Exp Fluids 57:109, 2016, Suzuki et al. in Geophys Res Lett 34, 2007, Yan et al. in J Fluids Eng 140:054502, 2018, New et al. in J Fluid Mech 899, 2020, Cheng et al. in Phys Fluids 31:067107, 2019, Hernández and Reyes in 29:103604, 2017, Mishra et al. in Phys Rev Fluids, 2021, Zednikova et al. …
Impact Of Voids And Backfill On Seismic Wave Velocity-Preliminary Results,
2022
Nazarbayev University, School of Mining and Geosciences, Nur-Sultan, Kazakhstan
Impact Of Voids And Backfill On Seismic Wave Velocity-Preliminary Results, Zarina Mukhamedyarova, Fidelis Suorineni, Temirlan Aldubay, Gylym Sapinov
Journal of Sustainable Mining
In this study, laboratory experiments were conducted on discrete physical models that mimic mining effects to better understand the impact of continuous changes in mining environments on seismic wave velocities. The discrete physical models are represented by concrete and granite cubic samples of different sizes with holes of different diameters filled and unfilled with cemented sand backfill of different cement-sand content ratios. The hole diameters range from 0 to 150 mm in block sizes ranging from 150 mm to 450 mm in increments of 75 mm. The increasing hole size mimics increasing extraction in the mine with time. Cemented sand …
Predicting The Stability Of Open Stopes Using Machine Learning,
2022
University of Alberta, School of Mining and Petroleum Engineering, Edmonton, Alberta T6G 2R3, Canada.
Predicting The Stability Of Open Stopes Using Machine Learning, Alicja Szmigiel, Derek B. Apel
Journal of Sustainable Mining
The Mathews stability graph method was presented for the first time in 1980. This method was developed to assess the stability of open stopes in different underground conditions, and it has an impact on evaluating the safety of underground excavations. With the development of technology and growing experience in applying computer sciences in various research disciplines, mining engineering could significantly benefit by using Machine Learning. Applying those ML algorithms to predict the stability of open stopes in underground excavations is a new approach that could replace the original graph method and should be investigated. In this research, a Potvin database …
Quantifying The Influence Of Variations In Rock Mass Properties On Stope Stability,
2022
McGill University, Department of Mining and Materials Engineering, Canada
Quantifying The Influence Of Variations In Rock Mass Properties On Stope Stability, Shahé Shnorhokian, Hani Mitri
Journal of Sustainable Mining
Variations in rock mass properties are well-established in rock mechanics and underground mining. The literature is replete with methods of assessing them and determining values that are used in design or numerical analysis. In this paper, a simplified 3D model is constructed for a tabular orebody in the Canadian Shield and instability is quantified using the ”brittle shear ratio” criterion to calculate the volume at risk. A 1-4-7 stope pillar sequence is implemented on four active levels, and three variations in the properties of the host formation are assessed. It is observed that the locations of ore at risk follow …
Prospects For Thiourea As A Leaching Agent In Colombian Gold Small-Scale Mining: A Comprehensive Review,
2022
Universidad Pedagógica y Tecnológica de Colombia, Facultad de Ingeniería, Escuela de Ingeniería Metalúrgica, Tunja, Colombia
Prospects For Thiourea As A Leaching Agent In Colombian Gold Small-Scale Mining: A Comprehensive Review, Johana Borda, Robinson Torres
Journal of Sustainable Mining
Thiourea, as an alternative medium, is one of the most promising leaching agents for gold recovery by its commercial benefits and research challenges associated with performance and environmental impacts. This review article describes the operational conditions for the use of Thiourea vs cyanide, its chemistry, limitations, toxicity factors, environment, and recovery processes. Although thiourea gold extraction processes have not been applied on a large scale due to the instability of the reagent, its potential to overcome the limitations of cyanide is attractive to the process; with pH, potential, oxidant dosage, and temperature control, solubilized gold thiourea species are achieved. These …
Panel Destressing Strategies For Remnant Pillar Extraction,
2022
McGill University, Department of Mining and Materials Engineering, 3450 University Street, Montreal, Quebec, Canada
Panel Destressing Strategies For Remnant Pillar Extraction, Isaac Vennes, Hani Mitri
Journal of Sustainable Mining
Large-scale panel destressing is a rockburst mitigation technique employed in deep hard rock mines during remnant pillar extraction. Panels are choke blasted in the pillar footwall to cutoff the far-field major stress in the mining area and deviate them around the pillar. In this study, the effects of panel geometry and far-field stress magnitude are investigated. Destress blast performance is assessed by measuring change to the energy release rate (ERR) of all mining steps during the extraction of a simplified remnant pillar due to destressing. It is demonstrated that the energy release rate (ERR) of critical stopes is reduced by …
Seismic Activity And Flooding Of Hard Coal Mines In The Ostrava-Karvina Coalfield,
2022
Institute of Geonics of the Czech Academy of Sciences, Czech Republic
Seismic Activity And Flooding Of Hard Coal Mines In The Ostrava-Karvina Coalfield, Petr Konicek, Eva Jirankova, Vlastimil Kajzar, Jan Schreiber, Pavel Malucha, Kristyna Schuchova
Journal of Sustainable Mining
The termination of mining activities often results in post-mining problems and risks. One of these issues is the flooding of mines. Long-term mining in the Ostrava and Petrvald sub-basins in the Upper Silesian Coal Basin finished in 1994. Tens of coal seams were mined here, and the depth of mining reached more than 1000 m below the surface. Flooding of the Ostrava sub-basin started in 1994. The Ostrava and Petrvald sub-basins were flooded from one half only to prevent water from flooding into the Karvina sub-basin, where mining continued. The continual pumping of water has been carried out ever since. …
Numerical Modelling Of Destress Blasting – A State-Of-The-Art Review,
2022
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei, China
Numerical Modelling Of Destress Blasting – A State-Of-The-Art Review, Shuting Miao, Petr Konicek, Peng-Zhi Pan, Hani Mitri
Journal of Sustainable Mining
As a proactive mine safety measure against the occurrence of rockburst, destress blasting has been applied to numerous mining conditions to precondition highly stressed rock mass to mitigate the risk of rockburst occurrence in deep mines as well as in deep underground constructions. However, the application of destress blasting mostly depends on engineering experience, while its mechanism and efficiency have not been well understood. Rapid advances in computer technology have made numerical simulation an economical and effective method to study the rock blasting effect. Enormous research efforts have been made to numerically investigate the blasting fracture mechanism, optimize blasting design, …
Analysis Of The Application Of Methane-Bearing Capacity Test Methods In The Conditions Of Polish Mining,
2022
Central Mining Institute, Department of Mining Aerology, Plac Gwarków 1, 40-166 Katowice, Poland
Analysis Of The Application Of Methane-Bearing Capacity Test Methods In The Conditions Of Polish Mining, Marcin Karbownik
Journal of Sustainable Mining
The methane hazard is one of the natural hazards occurring in hard coal mining. The content of natural methane in hard coal seams, the so-called methane-bearing capacity, is one of the key parameters that allow for proper assessment of the methane hazard and the state of the threat of gas and rock outbursts. For safety purposes, there is a constant need to improve the methods for the determination of this parameter. In the conditions of Polish mining, the method used for methane-bearing capacity determination is the direct drill cuttings method. This paper contains a comparative study presenting three different methods …
Proposed Design Fire Scenarios For Underground Hard Rock Mines,
2022
The University of Queensland, Sustainable Minerals Institute, Australia
Proposed Design Fire Scenarios For Underground Hard Rock Mines, Rickard Hansen
Journal of Sustainable Mining
Given the complexity and uniqueness of underground hard rock mines, the application of the design fire scenario approach is recommended when evaluating fire safety in mines. Providing a full set of design fire scenarios – ensuring that several important life safety aspects are covered – for a mine can be challenging. The question is whether a catalogue of potential clusters of design fire scenarios could be developed, covering important aspects found underground? Given the general lack of research into design fires in the mining industry, this paper provides a unique analysis of design fire scenarios in underground hard rock mines. …
Effect Of Mining And Geology On Mining-Induced Seismicity – A Case Study,
2022
McGill University, Department of Mining and Materials Engineering, Canada
Effect Of Mining And Geology On Mining-Induced Seismicity – A Case Study, Heba Khalil, Tuo Chen, Yu-Hang Xu, Hani Mitri
Journal of Sustainable Mining
Mining-induced seismicity is a commonly occurring phenomenon in underground mines. This poses a greater challenge to the safety of the mining operation. This paper presents a case study of the Young-Davidson mine in northern Ontario, Canada, where seismic events of magnitude Mn 2.0+ have been observed at mining depths of 600 to 800 m below the surface. The occurrence of large seismic events at such shallow depths is the key issue of this study. A comprehensive study of the microseismic database has been conducted to discern the root causes for the unusually strong seismic activities recorded at shallow depths. The …
Shaft Liquidation Method Adjusted For High Precipitation Associated With Climate Change Impact,
2022
Central Mining Institute (GIG), Department of Extraction Technologies, Rockburst and Risk Assessment, Katowice, Poland
Shaft Liquidation Method Adjusted For High Precipitation Associated With Climate Change Impact, Jan Szymała, Joanna Całus Moszko, Ewa Janson, Dagmara Sobczak, Stanisław Konsek
Journal of Sustainable Mining
In connection with the implementation of the international project TEXMIN within the framework of the RFCS fund, a project for the liquidation of the Głowacki Shaft in Rybnik (Poland) was undertaken, which takes into account the effects of climate change, i.e. evaluation of the increase of precipitation in the region. In addition to the standard research undertaken before liquidation activities, precipitation data recorded by the Institute of Meteorology and Water Management from 1995 to 2019 was collected and the precipitation variability was analysed. As a result, a method for liquidation of the shaft was selected consisting of constructing a permeable …
Environmentally Balanced Approaches To Future Deep Seabed Mining,
2022
World Maritime University
Environmentally Balanced Approaches To Future Deep Seabed Mining, Jonatan J. Víctor Mendoza Alarcón
World Maritime University Dissertations
No abstract provided.
Uncertainty Analysis Of Operational Conditions In Selective Artificial Ground Freezing Applications,
2022
McGill University, Mining Engineering Department, Montreal, Quebec, Canada
Uncertainty Analysis Of Operational Conditions In Selective Artificial Ground Freezing Applications, Ahmad Zueter, Saad Akhtar, Agus Sasmito
Journal of Sustainable Mining
Artificial ground freezing (AGF) systems are susceptible to uncertain parameters highly affecting their performance. Particularly, selective artificial ground freezing (S-AGF) systems involve several uncertain operational conditions. In this study, uncertainty analysis is conducted to investigate four operational parameters: 1) coolant inlet temperature, 2) coolant flow rate, 3) pipes emissivity, and 4) pipes eccentricity. A reduced-order model developed and validated in our previous work for field-scale applications is exploited to simulate a total of 5,000 cases. The uncertain operational parameters are set according to Monte Carlo analysis based on field observations of a field-scale freeze-pipe in the mining industry extending to …
