The polymetallic nodules in the deep-sea multi-stage lifting motor pump will undergo repeated impeller blade impact and fragmentation, which will change the particle size, thereby affecting the number of ores that can be recovered on the surface and the design parameters of the processing equipment. A new calculation method of degradation rate is proposed. The degradation model of multiple impacts of particles is improved to quantitatively calculate the final particle size distribution (PSD) of polymetallic nodules transported from the Clarion Clipperton Zone (CCZ) to the ground through a series of multi-stage lifting electric pumps. The newly proposed calculation method is obtained by analyzing the degradation of experimental data of polymetallic nodules when they pass through the six-stage lifting motor pump experimental system many times. The improved model is used to predict the PSD of the nodules after running for 10 min in the experimental system, and compared with the experimental test results, the deviation is small. The new method can estimate the change in PSD of nodules due to degradation during transportation, reducing design costs for land processing equipment.

中文翻译：

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深海多级提升电机泵中多金属结核的降解

深海多级提升电机泵中的多金属结核会反复受到叶轮叶片的冲击和破碎，从而改变粒度，从而影响地表可回收矿石的数量和处理的设计参数设备。提出了一种新的降解率计算方法。改进粒子多次冲击的降解模型，通过一系列多级提升电动泵，定量计算从克拉里昂克利珀顿区（CCZ）输送到地面的多金属结核最终粒度分布（PSD）。新提出的计算方法是通过分析多金属结核多次通过六级提升电机泵实验系统时的实验数据退化得到的。采用改进模型对实验系统运行10 min后结节的PSD进行预测，与实验测试结果相比，偏差较小。新方法可以估算由于运输过程中退化引起的结核PSD的变化，降低了土地处理设备的设计成本。