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A seabed collector vehicle usually carries a large amount of sediments during mining seabed polymetallic nodules. For reducing the environmental impact caused by tail water discharged in the mining, two kinds of high efficiency and low diffusion desliming pretreatment devices, with twine-drum spiral structure and a direct discharge device with arresting mesh structure, respectively, have been developed, which integrates a jet-assisted transport testing equipment, and is also equipped with an online monitoring system. The desliming effect and environmental performance of the developed device was evaluated by performing computational fluid dynamics simulations and laboratory tests. It is found that the direct discharge device with arresting mesh can pretreat tails with desliming rate over 98%, and this pretreatment device can make quick separation of nodules from sediment, and also lead to subsequent quick settlement of the separated sediment, thus effectively controlling the plume caused by collector in the mining. It is concluded that this developed pretreatment device can improve the lifting efficiency in the mining and mitigate the pollution of tails in the deep-sea mining from the source.
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海底采矿车在采集深海多金属结核时携带大量沉积物,为减少采矿尾水对海洋环境的影响,开发了双螺旋滚筒结构和直排拦阻网结构的两种高效、低扩散脱泥预处理装置,并集成射流输送辅助试验设备、配备在线监测系统。采用计算流体动力学仿真和实验室试验对该装置的脱泥效果和环境保护性能进行评估。结果显示,直排拦阻网结构脱泥预处理装置脱泥率超过98%,它能迅速分离泥沙,并在较短时间内使泥沙沉降,有效控制采矿车羽流,提高采矿输送效率,从源头减少采矿尾水的污染。
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2.深海矿产资源开发利用技术国家重点实验室,湖南 长沙 410012, bio={"content":"
吴冬华(1980—),男,湖南长沙人,工程师,主要研究方向为深海采矿技术与水下装备。E-mail:kyy_wudh@minmetals.com
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吴冬华(1980—),男,湖南长沙人,工程师,主要研究方向为深海采矿技术与水下装备。E-mail:kyy_wudh@minmetals.com
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尾部扩散排放装置, figureFileSmall=eOjME7RrfhQAro4fm2biUw==, figureFileBig=1EuPk+xg7zovVaqlOvg05Q==, tableContent=null), ArticleFig(id=1241406735450173534, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406725362872829, language=EN, label=null, caption=null, figureFileSmall=ixtaZqcCi+CkuiRINIdefw==, figureFileBig=sycefkOaHwVW7B2Km4IPIA==, tableContent=null), ArticleFig(id=1241406735555031141, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406725362872829, language=CN, label=图7, caption=
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脱泥预处理装置模型(a)原始预处理装置;(b)双螺旋滚筒结构脱泥预处理装置;(c)直排拦阻网结构脱泥预处理装置
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模拟多金属结核(含泥), figureFileSmall=HL6zLGFPA77O8qkBUbxQuQ==, figureFileBig=IZSCX5RT39BIHm2Zh0rHqw==, tableContent=null), ArticleFig(id=1241406735987044479, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406725362872829, language=EN, label=null, caption=null, figureFileSmall=nm69SUGCJKRIyUp0yY3gHw==, figureFileBig=8wWf9pradPSVzQ25F65wJQ==, tableContent=null), ArticleFig(id=1241406736091902084, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1241406725362872829, language=CN, label=图10, caption=
直排拦阻网结构脱泥预处理称重料仓测量曲线(a)试验1;(b)试验2
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不同位置浊度监测结果(a)试验1;(b)试验2
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| 模型名称 | 流入料仓体积量/(m3·s-1) | 流入料仓速度/(m·s-1) | 底部排泥出口体积量/(m3·s-1) | 底部排泥出口速度/(m·s-1) |
|---|
| 原始预处理装置 | 0.017 8 | 0.38 | 0.012 9 | 0.21 |
| 双螺旋滚筒结构脱泥预处理装置 | 0.023 5 | 0.21 | 0.032 1 | 0.27 |
| 直排拦阻网结构脱泥预处理装置 | 0.015 0 | 0.13 | 0.040 6 | 0.22 |
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不同流态下低扩散脱泥预处理模型仿真结果
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| 模型名称 | 流入料仓体积量/(m3·s-1) | 流入料仓速度/(m·s-1) | 底部排泥出口体积量/(m3·s-1) | 底部排泥出口速度/(m·s-1) |
|---|
| 原始预处理装置 | 0.017 8 | 0.38 | 0.012 9 | 0.21 |
| 双螺旋滚筒结构脱泥预处理装置 | 0.023 5 | 0.21 | 0.032 1 | 0.27 |
| 直排拦阻网结构脱泥预处理装置 | 0.015 0 | 0.13 | 0.040 6 | 0.22 |
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| 试验编号 | 带泥样品质量/kg | 样品质量/kg | 清洗后样品质量/kg | 初始含泥率/% | 最终含泥率/% | 脱泥率/% |
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| 1 | 197.20 | 151.20 | 152.10 | 23.30 | 0.46 | 98.04 |
| 2 | 121.00 | 100.00 | 100.29 | 17.40 | 0.24 | 98.62 |
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直排拦阻网结构脱泥预处理装置试验结果
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| 试验编号 | 带泥样品质量/kg | 样品质量/kg | 清洗后样品质量/kg | 初始含泥率/% | 最终含泥率/% | 脱泥率/% |
|---|
| 1 | 197.20 | 151.20 | 152.10 | 23.30 | 0.46 | 98.04 |
| 2 | 121.00 | 100.00 | 100.29 | 17.40 | 0.24 | 98.62 |
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