Besides pumping systems, in the first line, another lifting system offers for mining mineral raw materials from large sea depths (up to 6000m) has been known for decades in the large-diameter drilling technique, the so-called air lift system. Compressed air is blown into a continuous straight lifting string (riser) from top to bottom by injection from the outside into the inner pipe in a certain depth. This operation initiates a continuous lifting process enabling lifting of large solids quantities.rnIn close cooperation with the BGR (German Federal Institute for Geosciences and Natural Resources) we have optimised this system for deep sea mining of manganese nodules in water depth up to 6000m as shown in figure 1.
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