On-board measurement methodology for the liquid-solid slurry production of deep-seabed mining

Oh, Jae-Won; Jung, Jung-Yeul; Hong, Sup

doi:10.1016/j.oceaneng.2017.12.016

Cited by 13 publications

(3 citation statements)

References 24 publications

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“…Mud that is too thick can easily block the pipeline, and mud that is too thin will affect the transmission efficiency. In addition, the amount of mud in the pipeline also affects the stability of the pipeline in water, and the external hydrodynamic effect has an impact on the stability of the pipeline and the whole mining system [95][96][97][98][99]. The research results of the above mining technology will eventually be verified through in situ tests, and the reliability of the technology will be repeatedly verified through mining simulation experiments.…”

Section: Mining Methodsmentioning

confidence: 99%

“…In recent years, various countries have gradually completed sea trials of self-developed deep-sea polymetallic nodule mining systems [86][87][88][89][90]. South Korea completed a sea test of its self-developed pipeline lifting device in 2016 [97], and China completed acceptance of the collection and lifting device of its self-developed polymetallic nodule mining system in the South China Sea in June 2021 [87].…”

Section: Mining Methodsmentioning

confidence: 99%

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Effects of Migration and Diffusion of Suspended Sediments on the Seabed Environment during Exploitation of Deep-Sea Polymetallic Nodules

Fan

Jia

Chu

et al. 2022

Water

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With the increase in demand for metal resources, research on deep-sea polymetallic nodule mining has been reinvigorated, but the problem of its environmental impact cannot be ignored. No matter what method is used for mining, it will disturb the surface sediments of the seabed, thereby increasing the concentration of suspended solid particles and metal ions in the water body, changing the properties of the near-bottom water body and sediments, and affecting biological activity and the living environment. Focusing on the ecological and environmental impacts of deep-sea polymetallic nodule mining, taking as our main subject of focus the dynamic changes in sediments, we investigated the environmental impacts of nodule mining and their relationships with each other. On this basis, certain understandings are summarized relating to the ecological and environmental impacts of deep-sea polymetallic nodule mining, based on changes in the engineering geological properties of sediment, and solutions for current research problems are proposed.

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Section: Mining Methodsmentioning

confidence: 99%

Section: Mining Methodsmentioning

confidence: 99%

Effects of Migration and Diffusion of Suspended Sediments on the Seabed Environment during Exploitation of Deep-Sea Polymetallic Nodules

Fan

Jia

Chu

et al. 2022

Water

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“…Research on seabed mining vehicles mainly focuses on the questions of how to normally walk underwater, how to collect nodules more effectively, and how to realize the positioning of mining vehicles in the presence of interference. In fact, the problem of mining vehicles traveling in nodule areas is highly complex and involves coupled processes between seabed mining vehicles and sediments [30,31]. Aside from the sealing and compression issues caused by water depth [27], from a sedimentary perspective, the shallow sediments in areas of deep-sea polymetallic nodule occurrence are very weak.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Mining Process on the Near-Seabed Environment of a Polymetallic Nodule Area: A Field Simulation Experiment in a Western Pacific Area

Li,

Jia,

Fan

et al. 2023

Sensors

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With the consumption of terrestrial metal resources, deep-sea polymetallic nodule minerals have been widely exploited around the world. Therefore, the environmental impact of deep-sea polymetallic nodule mining cannot be ignored. In this study, for the first time, a field disturbance and observation device, integrated with multiple sensors, is used to simulate the disturbance process of mining on seabed sediments in the polymetallic nodule area of the western Pacific Ocean at a depth of 5700 m. The impact of the process of stroking and lifting on the bottom sediment in the polymetallic nodule area is 30 times higher than that caused by the waves or the current. The time for turbidity to return to normal after the increase is about 30 min, and the influence distance of a disturbance to the bottom bed on turbidity is about 126 m. The time it takes for density to return to normal is about four hours, and the influence is about 1000 m. At the same time, the resuspension of the bottom sediment leads to an increase in density anomaly and salinity. Moreover, suspended sediments rich in metal ions may react with dissolved oxygen in water, resulting in a decrease in the dissolved oxygen content and an increase in ORP. During the observation period, the phenomenon of a deep-sea reciprocating current is found, which may cause the suspended sediment generated by the continuous operation of the mining vehicle to produce suspended sediment clouds in the water near the bottom of the mining area. This could lead to the continuous increase in nutrients in the water near the bottom of the mining area and the continuous reduction in dissolved oxygen, which will have a significant impact on the local ecological environment. Therefore, the way mining vehicles dig and wash in water bodies could have a marked impact on the marine environment. We suggest adopting the technology of suction and ore separation on mining ships, as well as bringing the separated sediment back to the land for comprehensive utilization.

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Technologies for Safe and Sustainable Mining of Deep-Seabed Minerals

Hong¹,

Kim²,

Yeu³

et al. 2019

Environmental Issues of Deep-Sea Mining

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On-board measurement methodology for the liquid-solid slurry production of deep-seabed mining

Cited by 13 publications

References 24 publications

Effects of Migration and Diffusion of Suspended Sediments on the Seabed Environment during Exploitation of Deep-Sea Polymetallic Nodules

Effects of Migration and Diffusion of Suspended Sediments on the Seabed Environment during Exploitation of Deep-Sea Polymetallic Nodules

Impact of the Mining Process on the Near-Seabed Environment of a Polymetallic Nodule Area: A Field Simulation Experiment in a Western Pacific Area

Technologies for Safe and Sustainable Mining of Deep-Seabed Minerals

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