China's seabed mining capacity

6. It depends on luck. The land and the sea are the same

7. In 1.08, you can only add force. In the enhanced version, you can only add bone. Choose me as far as possible.

8.

There are many minerals in the ocean, especially a large number of manganese noles are distributed in the surface layer of the ocean bottom with a water depth of 2000-6000 meters

the appearance of manganese noles is like potatoes, inside which there are many layers, the diameter is generally 1-25 cm, the largest diameter can reach 1 m, and the weight is several hundred kg. It contains more than 70 elements, among which manganese, copper, cobalt and nickel are very high. The total reserves of manganese noles in the world's oceans are about 3 trillion tons, including 400 billion tons of manganese, 8.8 billion tons of copper, 16.4 billion tons of nickel and 9.8 billion tons of cobalt, which are tens to thousands of times of the reserves of the mainland respectively. They have high instrial exploitation value and are known as the mineral resources of the 21st century

It is very difficult to mine manganese noles. First of all, it is distributed in the surface of the deep sea, where the sea water pressure is very high, which has special requirements for the compression resistance, firmness and corrosion resistance of mining equipment. Secondly, to collect manganese noles from thousands of meters deep and lift them to the sea, it is impossible to operate without high-power lifting devices and advanced mining equipment. In addition, in order to improve mining efficiency, it is necessary to equip monitoring, display, recording and control systems with high accuracy and reliable performance. Therefore, the method of mining manganese noles in the world is not mature. At present, it is generally considered that there are three methods are suitable:

one is hydraulic lifting mining system. It is mainly composed of mining pipe, buoy, high pressure water pump and ore collecting device. The mining pipe is suspended under the mining ship and buoy to transport manganese noles. The buoy is installed on the upper part of the mining pipe. The buoy is filled with high-pressure air, and its buoyancy supports the weight of the high-pressure water pump. The high-pressure water pump is installed in the buoy. Through high pressure, the upward flow of 5 meters per second is generated in the mining pipeline, so that the manganese noles and water are lifted from the seabed to the mining ship. The function of mining equipment is to screen and collect manganese noles. After continuous improvement, this mining system has reached a mining capacity of 500 tons per day< p> The second is the air lift mining system. It is composed of high pressure air pump, mining pipe and ore collecting device. The high-pressure air pump is installed on the ship. At the beginning of the mining operation, the high-pressure air pump is first started on the ship. The high-pressure air generated by the air pump is fed into the mining pipe from the upper, middle and lower parts of the mining pipe through the gas pipeline, so that the high-speed upward flow composed of solid, gas and liquid is generated in the mining pipe, The manganese noles treated by the screening system of the ore collecting device are lifted into the mining vessel. At present, this mining system has the ability to extract manganese noles at a depth of 5000 meters with a daily output of 300 tons

Thirdly, continuous bucket mining system. A mining bucket is installed every 25-50m on the high-strength polypropylene glycol rope chain. During mining, the hauling machine on the ship drives the rope chain, turns the bucket on the seabed through the winch pulley, continuously excavates manganese noles, and continuously lifts them upward to unload the ore onto the ship, and then screen and remove the sediment. Through a lot of experiments, it is proved that this mining system has the advantages of simple structure, strong adaptability and low mining cost. Its disadvantage is that the mining efficiency is low, and it is difficult to accurately control the mining area

generally speaking, hydraulic lifting and air lifting mining systems are ideal. Some of their ore collecting devices adopt jet suction, some adopt mechanical stripping, and some even have the most advanced automatic control mechanical ore collecting device with propeller

In addition to the above three mining methods, some countries have developed an automatic seabed mining technology. This technology mainly uses the remote control submersible to dive to the seabed to collect manganese noles, and then floats automatically to unload the collected ore to the mining platform. Although this kind of deep submergence mining is advanced and has a certain mining depth, it has a limited amount of collection each time, and the sinking and floating time is too long, so it is far inferior to the above three mining methods economically. At present, deep submergence mining method is mainly used in sampling and test mining stage before large-scale mining

9. Together, the protagonist follows a submarine to the bottom of the sea. When attacked by giant sharks and electric eels, the submarine will become transparent and discharge electricity. The bottom of the sea is a base that the Japanese forced Chinese laborers to dig ring World War II. They attacked ships on the sea to seek resources. They wanted to build aircraft carriers or attack the United States with atomic bombs.