公开(公告)号：US20220204880A1

公开(公告)日：2022-06-30

申请号：US17605626

申请日：2020-04-20

Applicant: JFE STEEL CORPORATION

Inventor： Ryota MURAI ,  Ikuhiro SUMI ,  Katsuyasu SUGAWARA ,  Takahiro KATO

IPC: C10L9/06

Abstract: A method for producing low-sulfur coal having an excellent desulfurization effect. In the production method, coal is brought into contact with a chemical agent that is a mixed solution of hydrogen peroxide and acetic acid to remove sulfur in the coal. It is preferred that the molar ratio of the acetic acid to the hydrogen peroxide ((acetic acid)/(hydrogen peroxide)) is 1.2 to 60.0 inclusive. It is preferred that the acetic acid is mixed with the hydrogen peroxide before the chemical agent is brought into contact with the coal and the chemical agent is brought into contact with the coal after 30 minutes or more has elapsed since the mixing is performed.

公开(公告)号：US20220323898A1

公开(公告)日：2022-10-13

申请号：US17642548

申请日：2020-08-13

Applicant: JFE STEEL CORPORATION

Inventor： Ryota MURAI ,  Goro OKUYAMA ,  Shunsuke OURA ,  Reo FUJIMURA ,  Tomomichi NAKAMURA ,  Shinichi SUEJIMA

IPC: B01D53/00 ,  B01D5/00

Abstract: An exhaust gas treatment method by which mercury contained in exhaust gas can be separated and removed efficiently and inexpensively. The method includes cooling an exhaust gas containing mercury in metal vapor phase by spraying water or other methods to condense mercury in the exhaust gas from metal vapor phase into metal liquid and thus to separate and remove mercury from the exhaust gas. When the exhaust gas is cooled by spraying water, the sprayed water is collected and separated into separated water and a solid containing mercury that has condensed to metal liquid, and mercury is recovered from the solid. The metal mercury particles that have condensed to metal liquid are dispersed in cooling water. The metal mercury particles can thus be easily separated and recovered by using a suitable separation device.

公开(公告)号：US20220220404A1

公开(公告)日：2022-07-14

申请号：US17605950

申请日：2020-04-20

Applicant: JFE STEEL CORPORATION

Inventor： Ryota MURAI ,  Ikuhiro SUMI ,  Katsuyasu SUGAWARA ,  Takahiro KATO

IPC: C10L9/06

Abstract: A low-sulfur coal production method having an excellent desulfurization effect includes bringing coal into contact with a chemical material that is a mixed solution of hydrogen peroxide and acetic anhydride to remove sulfur in the coal. It is preferred that the molar ratio of the acetic anhydride to the hydrogen peroxide is 0.5 to 12.0 inclusive. It is preferred that the acetic anhydride is mixed with the hydrogen peroxide before the chemical material is brought into contact with the coal and the chemical material is brought into contact with the coal after 10 minutes or more has elapsed since the mixing.