Cyclic Behavior of Iron Ore Fines on Board Bulk Carriers: Scale Model Analysis

2017 ◽  
Vol 29 (7) ◽  
pp. 04017046 ◽  
Author(s):  
Michael C. Munro ◽  
Abbas Mohajerani
Keyword(s):  
Iron Ore ◽  
Model Analysis ◽  
Cyclic Behavior ◽  
Scale Model ◽  
Bulk Carriers ◽  
Iron Ore Fines

Slope stability evaluation of iron ore fines during marine transport in bulk carriers

2018 ◽  
Vol 55 (2) ◽  
pp. 258-278 ◽  
Author(s):  
Michael C. Munro ◽  
Abbas Mohajerani
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Iron Ore ◽  
Slope Failure ◽  
Human Life ◽  
Shear Strength Parameters ◽  
Strength Parameters ◽  
Marine Transport ◽  
Bulk Carriers ◽  
Iron Ore Fines

A commodity, such as iron ore fines, shifting in the hold of a bulk carrier can lead to the vessel listing or capsizing. The objective of this study is to investigate the factors of safety pertaining to slope failure for both untrimmed and trimmed cargoes of iron ore fines during marine transportation. To determine the shear strength parameters needed to perform this analysis, triaxial testing was performed on samples of iron ore fines under varying densities and moisture contents. Using the shear strength parameters of the material, the Morgenstern–Price method of slices and infinite slope analysis, referred to as rotational and translational slope stability analyses, were used to determine the factors of safety against slope failure. The study concludes that, considering a factor of safety of 1.5, an untrimmed cargo of iron ore fines is unstable at angles of heel that bulk carriers are expected to experience during a typical voyage. If the cargo is trimmed it is shown to be significantly more stable. Results support the recommendation that it become mandatory for cargoes of iron ore fines to undergo trimming to reduce the chance of slope failure occurring, which may result in the loss of human life and industry assets.

Design modification of iron ore bearing transfer chute using discrete element method

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Saprativ Basu ◽  
Arijit Chakrabarty ◽  
Samik Nag ◽  
Kishore Behera ◽  
Brati Bandyopadhyay ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Iron Ore ◽  
Bulk Material ◽  
Flow Behavior ◽  
Material Model ◽  
Discrete Element ◽  
Content Type ◽  
Iron Ore Fines ◽  
Cohesive Materials ◽  
Element Method

Purpose The dryer feed chute of the pellet plant plays an important role in the pelletizing process. The chute discharges sticky and moist iron ore fines (<1 mm) to the inline rotary dryer for further processing. Since the inception of the installation of the dryer feed chute, the poor flowability of the feed materials has caused severe problems such as blockages and excessive wear of chute liners. This leads to high maintenance costs and reduced lifetime of the liner materials. Constant housekeeping is needed for maintaining the chute and reliable operation. The purpose of this study is to redesign the dryer feed chute to overcome the above challenges. Design/methodology/approach The discrete element method (DEM) has been used to model the flow of cohesive materials through the transfer chute. Physical experiments have been performed to understand the most severe flow conditions. A DEM material model is also developed for replicating the worst-case material condition. After identifying the key problem areas, concept designs were proposed and simulated to assess the design improvements to increase the reliability of chute operation. Findings Flow simulations correlated well with the existing flow behavior of the iron ore fines inside the chute. The location of the problematic areas has been validated with that of the previously installed chute. Subsequently, design modifications have been proposed. This includes modification of deflector plate and change in slope and cross-section of the chute. DEM simulations and analysis were conducted after incorporating these design changes. A comparison in the average velocity of particle and force on chute wall shows a significant improvement using the proposed design. Originality/value Method to calibrate DEM material model was found to provide accurate prediction and modeling of the flow behavior of bulk material through the real transfer chute. DEM provided greater insight into the performance of the chute especially modeling cohesive materials. DEM is a valuable design tool to assist chute designers troubleshoot and verify chute designs. DEM provides a greater ability to model and assess chute wear. This technique can help in achieving a scientific understanding of the flow properties of bulk solids through transfer chute, hence eliminate challenges, ensuring reliable, uninterrupted and profitable plant operation. This paper strongly advocates the use of calibrated DEM methodology in designing bulk material handling equipment.

scholarly journals Kinetics of Gaseous Reduction of Iron Ore Fines.

1993 ◽  
Vol 33 (11) ◽  
pp. 1168-1173 ◽  
Author(s):  
Sujoy K. Dutta ◽  
Ahindra Ghosh
Keyword(s):  
Iron Ore ◽  
Gaseous Reduction ◽  
Reduction Of Iron ◽  
Iron Ore Fines ◽  
Kinetics Of
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