ABSTRACT:

China has started the research on lifting technology in deep-sea mining since 1991. Some experimental researches have been done on hydraulic lift by slurry pump, air-lift, pump-lift with clear water, lift by jet pump, etc. After being compared with each other, hydraulic lifting method with slurry pump has been considered as the lifting method in Chinese deep-sea mining system research. During the 10th Five-Year plan period (2000–2005), the main research work on lifting technology by COMRA is to design and fabricate the lifting motor pump for nodules mining test in deep sea at the depth of 1000m. The author of this paper not only took part in all these studies on the lift technology from 1991 when COMRA was founded, but also was responsible for research on lifting pump. In this paper, a detailed description will be given of the lifting motor pump. It includes:

  1. requirements for the lifting motor pump designed for test in the sea at the depth of 1000m,

  2. design parameters for the pump,

  3. the description of design and construction of the pump,

  4. the test of the characteristics of the two-stage motor pump in the lab.

INTRODUCTION

China has started the research on lifting technology in deep-sea mining since 1991. Some experimental researches have been done on several lift methods. After being compared with each other, hydraulic lifting method with slurry pump has been considered as the lifting method in Chinese deep-sea mining research (Zou, 2006). In the hydraulic lift system, the lifting motor pump which transports slurry of nodule-water mixtures from the buffer at the bottom part of the pipe through the nearly vertical pipe string to ocean surface is the most important equipment (Chung, 1996). The pumps are schedule to be installed at about 1000m below the free surface.

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