首页|Experimental investigation of the inhibition of deep-sea mining sediment plumes by polyaluminum chloride

Experimental investigation of the inhibition of deep-sea mining sediment plumes by polyaluminum chloride

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Deep-sea sediment disturbance may occur when collecting polymetallic nodules,resulting in the creation of plumes that could have a negative impact on the ecological environment.This study aims to investi-gate the potential solution of using polyaluminum chloride(PAC)in the waterjet.The effects of PAC are examined through a self-designed simulation system for deep-sea polymetallic nodule collection and sediment samples from a potential deep-sea mining area.The experimental results showed that the opti-mal PAC dose was found to be 0.75 g/L.Compared with the test conditions without the addition of PAC,the presence of PAC leads to a reduction in volume,lower characteristic turbidity,smaller diffusion veloc-ity,and shorter settling time of the plume.This indicates that PAC inhibits the entire development pro-cess of the plume.The addition of PAC leads to the flocculation of mm-sized particles,resulting in the formation of cm-sized flocs.The flocculation of particles decreases the rate of erosion on the seabed by around 30%.This reduction in erosion helps to decrease the formation of plumes.Additionally,when the size of suspended particles increases,it reduces the scale at which they diffuse.Furthermore,the set-tling velocity of flocs(around 10 2 m/s)is much higher that of compared to sediment particles(around 10 5 m/s),which effectively reduces the amount of time the plume remains in suspension.

Deep-sea miningDeep-sea polymetallic nodulesSediment plumePolyaluminum chlorideJet impactParticle flocculation

Fengpeng Zhang、Xuguang Chen、Jiakang Wei、Yangyang Zhang、Weikun Xu、Hao Li

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College of Engineering,Ocean University of China,Qingdao 266100,China

Shandong Province Key Laboratory of Ocean Engineering,Ocean University of China,Qingdao 266100,China

China Merchants Marine and Offshore Research Institute Co.,Ltd.,Shenzhen 518000,China

National Deep Sea Center,Qingdao 266237,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities66th voyage of China Ocean's"Deep Sea No.1"scientific research vessel

52225107U2106224U190623451822904U1706223202041004

2024

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI
影响因子:1.222
ISSN:2095-2686
年,卷(期):2024.34(1)
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