公开(公告)号：US20240092648A1

公开(公告)日：2024-03-21

申请号：US18269471

申请日：2021-12-28

Applicant: KOREA MARITIME UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION

Inventor： Myoung Jin KIM

IPC: C01F5/40

CPC classification number: C01F5/40 ,  C01P2002/72 ,  C01P2002/88 ,  C01P2006/80

Abstract: A method for recovering high-purity magnesium sulfate includes: a pre-precipitation step of mixing an alkali precipitant and seawater; a concentration step of reacting a precipitate formed in the pre-precipitation step with sulfuric acid, followed by filtering to obtain a first eluate; a first precipitation step of adding ethanol to the first eluate, and then removing a first precipitated solid to obtain a second eluate; and a second precipitation step of precipitating magnesium sulfate solid by further adding ethanol to the second eluate from which the first precipitated solid has been removed.

公开(公告)号：US20230278882A1

公开(公告)日：2023-09-07

申请号：US18016588

申请日：2021-08-10

Applicant: KOREA MARITIME UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION

Inventor： Myoung Jin KIM ,  Geun Young KIM ,  Se Hun KIM ,  Seon Mi SHIN

IPC: C01F11/18 ,  A23L33/16

CPC classification number: C01F11/183 ,  A23L33/16 ,  C01P2002/72 ,  C01P2002/82 ,  C01P2004/03 ,  C01P2004/62

Abstract: There is provided a method for producing calcium carbonate by utilizing seawater and calcinated shells, and calcium carbonate and a calcium agent produced thereby. The method for producing calcium carbonate includes: eluting calcium by mixing calcinated shells, seawater, and sugar; and generating calcium carbonate by injecting carbon dioxide into the calcium eluate generated in the eluting calcium. The calcium agent includes vaterite-type calcium carbonate.