Japan Agency for Marine-earth Science and Technology

Toa Corporation

Nlc Co., Ltd.

Keita Akiyama

Yoshihisa Kawamura

Ikuo Sawada

Masanori Kyo

Eigou Miyazaki

Shinya Omori

Hiroshi Iida

Masaki Kawahara

Eigo Miyazaki

Ryutaro Murakami

Tomohiro Morisawa

Tomoaki Suzuki

Yasuhiro Namba

Yuichi Shimmoto

Mikito Furuichi

A method for recovering rare-earth mud including steps of: (A) penetrating a mud gathering pipe into a layer containing rare-earth mud under the seafloor, (B) preparing a slurry containing a rare earth by loosening rare-earth mud in the mud gathering pipe, and (C) transferring the slurry through a mud raising pipe. A rare-earth mud recovery system including: a mud gathering pipe configured to penetrate into a layer containing rare-earth mud under a seafloor; a stirring device configured to loosen rare-earth mud in the mud gathering pipe; and a mud raising pipe connected to the mud gathering pipe.

Method for recovering rare-earth mud, and recovery system

A mining riser pipe is extended from above water toward a water bottom containing water bottom resources, and a lower portion of an insertion pipe connected to a lower portion of the mining riser pipe is inserted into the water bottom. A liquid is supplied into the insertion pipe and a rotation shaft extends axially inside both of pipes is rotated to rotate stirring blades attached to a lower portion of the rotation shaft inside the insertion pipe, thereby drilling and dissolving mud S inside the insertion pipe into a slurry form by is raised to an upper portion of the insertion pipe by a stirring flow generated by the rotation of the stirring blades, and the raised mud is lifted above the water through the mining riser pipe by a lifting force.

Water bottom resource collecting system and collecting method

A concave section such as an extension section, a cutting section, and a notch section is provided to receive a lid of a float valve in an inside of outer tube assembly of a drill string. Thus, when the float valve is provided for the drill string, it is made possible to collect a core with a larger diameter by a thinner drill string, by expanding the inner diameter of the drill string.

Float valve sub

Growing community of inventors

Yokosuka, Japan

Keita Akiyama