Exploitation system and exploitation process for deep-sea poly-metallic nodule

Abstract

The invention discloses an exploitation system for deep-sea poly-metallic nodules. The exploitation system includes a mine collecting sub system and a mine raising sub system, and a control system controlling operation of the mine collecting sub system. The mine collecting sub system includes a submarine mining robot, an umbilical cable and a mine collecting groove. The mine raising sub system includes a submersible sewage pump, a mine raising soft tube, an exploitation platform and at least one separator arranged on the exploitation platform. Two ends of the mine raising soft tube are respectively connected to the mine collecting sub system and the submersible sewage pump. The submersible sewage pump is connected to a liquid phase outlet of the separator through a pipeline and is arranged at the water depth of 160-300 m. Through the principle of connected vessels, height differential pressure is generated through water suction and discharge by the submersible sewage pump, wherein the submarine poly-metallic nodules collected and sorted by the submarine mining robot are directly conveyed to the floating-caisson exploitation platform through the mine raising soft tube without impellers in the pump and are sorted and filtered through the separators, thereby achieving continuous work of mine collecting, mine sorting, mine raising and mine storage.

Description

technical field [0001] The invention relates to a mining technology of seabed surface mineral resources, in particular to a mining system and mining technology of deep-sea polymetallic nodules. Background technique [0002] Polymetallic nodules mainly occur in the surface layer of seabed sediments at a depth of 3000-6000 meters. It is estimated that the value of mining is about 70 billion tons. Mining and lifting are the core technologies and components in the mining process. At present, the mining methods of polymetallic nodules at home and abroad mainly include continuous chain bucket method, mortar pump hydraulic pipeline lifting method and air lifting method. Continuous chain bucket mining is to use the winch to drive the rope chain with many buckets to continuously mine polymetallic nodules on the seabed to the workboat. However, this method has low mining efficiency and resource recovery rate, flat seabed terrain requirements, and easy entanglement of cables. shortcom...

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Problems solved by technology

Continuous chain bucket mining is to use the winch to drive the rope chain with many buckets to continuously mine polymetallic nodules on the seabed to the workboat. However, this method has low mining efficiency and resource recovery rate, flat seabed terrain requirements, and easy entanglement of cables. shortcoming

The mortar pump hydraulic pipeline lifting method is to install the pump on the mining pipeline with a water depth of about 1,000 meters, and use the potential energy of seawater to lift it. Its advantages are simple process and high efficiency. Abrasion and fragmentation and differentiation of nodules

Air lift mining is to use high-pressure air to transport polymetallic nodules and muddy water from the seabed to the surface through ore pipelines. When the seawater depth is greater than 3,000 meters, a large air volume and high air pressure air compressor is required. The depth of the lowered double-wall drill pipe is greater than 1,000 meters, which has the disadvantages of low ore-carrying speed, large energy consumption, and high mining costs.

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