Geotechnical characteristics of seafloor massive sulfides and cobalt-rich manganese crusts and their influences on design of the mining systems

2005 ◽  
Author(s):  
T. Yamazaki
Keyword(s):  
Massive Sulfides ◽  
Geotechnical Characteristics

Geotechnical characteristics of the Zabeli location, Gjilan

2017 ◽  
Author(s):  
Shemsi Mustafa ◽  
Misin Misini ◽  
Zenun Elezaj
Keyword(s):  
Geotechnical Characteristics

scholarly journals Petrographic and Geotechnical Characteristics of Carbonate Aggregates from Poland and Their Correlation with the Design of Road Surface Structures

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2034
Author(s):  
Jerzy Trzciński ◽  
Emilia Wójcik ◽  
Mateusz Marszałek ◽  
Paweł Łukaszewski ◽  
Marek Krajewski ◽  
...  
Keyword(s):  
Road Surface ◽  
Surface Structures ◽  
Engineering Properties ◽  
Geological Engineering ◽  
Functional Relationships ◽  
Road Design ◽  
Geotechnical Characteristics ◽  
Design Calculations ◽  
Building Engineering ◽  
Design And Construction

The paper presents the basic problem related with practical application of carbonate rocks in construction: are carbonate aggregates produced from such rocks favorable for building engineering, particularly for road design and construction? To resolve this problem, (1) the geological-engineering properties of aggregates are presented, (2) the correlation between petrographic and engineering parameters is shown, and (3) a strict correlation between the geological-engineering properties and the freezing-thawing and crushing resistance is recognized. This knowledge has allowed to assess the usefulness of asphalt concrete (AC) made from dolomite and limestone aggregates in the design and construction of road surface structures. The petrography was characterized using optical microscopy and scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscope (EDS). Engineering properties were determined in accordance with European and Polish norms and guidelines. Statistical and design calculations were performed using dedicated software. The petrographic properties, and selected physical and mechanical parameters of the aggregates, were tested to show their influence on the freezing–thawing and crushing resistance. Strong functional relationships between the water adsorption, and the freezing–thawing and crushing resistance have been observed. Aggregate strength decreased after saturation with increasing concentrations of salt solutions. Calculations of AC fatigue durability and deformation allow for reducing the thickness of the road surface structure by about 20% in comparison to normative solutions. This conclusion has impact on the economy of road design and construction, and allows for a rational utilization of rock resources, which contributes to sustainable development of the construction industry.

Geotechnical characteristics of a Rubber Intermixed Ballast System

2021 ◽  
Author(s):  
Chathuri M. K. Arachchige ◽  
Buddhima Indraratna ◽  
Yujie Qi ◽  
Jayan S. Vinod ◽  
Cholachat Rujikiatkamjorn
Keyword(s):  
Geotechnical Characteristics

Concept of Seafloor Mineral Processing for Development of Seafloor Massive Sulfides

2011 ◽  
Author(s):  
Yasuharu Nakajima ◽  
Shotaro Uto ◽  
Shigeo Kanada ◽  
Joji Yamamoto ◽  
Ichihiko Takahashi ◽  
...  
Keyword(s):  
High Pressures ◽  
Pure Water ◽  
Analytical Data ◽  
Mineral Resources ◽  
Mineral Processing ◽  
Column Flotation ◽  
Metallic Elements ◽  
Massive Sulfides ◽  
Chemical Reagents ◽  
Froth Layer

Seafloor Massive Sulfides (SMS), which were formed by deposition of precipitates from hydrothermal fluids vented from seafloor, is one of unconventional mineral resources beneath deep seafloors in the world. The authors have proposed the concept of seafloor mineral processing for development of SMS, where useful minerals included in SMS ores are separated on seafloor to be lifted while the remaining gangue is disposed on seafloor in appropriate ways. To apply column flotation, one of conventional methods in mineral processing, to seafloor mineral processing, the authors carried out simulating experiments of column flotation on deep seafloor using ores including copper, iron, lead and zinc as metallic elements. Prior to the experiments at high pressures, preparatory experiments at the atmospheric pressure were carried out to find out the optimum condition of the properties of pulp, a mixture of feed ore, water and chemical reagents. In flotation experiments at high pressures, formation and overflow of froth layer by bubbling were observed at 1MPa in both of pulps with pure water and artificial seawater. The analytical data showed that the concentration of metallic elements such as copper and zinc in the concentrates recovered from the experiments was higher than that in the feed ores while the concentration of silicon and calcium, which are assigned to gangue, in the concentrates was lower than that in the feed ores. These results suggest that column flotation can be applied to operation on seafloor.

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