Method and apparatus for treating process water

US9802838B2 · kind B2 · utility

Assignees

• POSCO CO., LTD · KR
• Primetals Technologies Austria GmbH · AT

Inventors

• Alois Gstoettenmayr · Rainbach, AT
• Hado Heckmann · Linz, AT
• Kurt Lukschander · Linz, AT
• Robert Millner · Loosdorf, AT
• Ulrike Schmidt · Eppelheim, DE
• Helmut Siegl · Linz, AT
• Johann Wurm · Linz, AT
• Chong Won CHOI · Jeomgok-myeon, KR
• Seok Min Yoon · Gwangju, KR

Key dates

• Filing date: Dec 6, 2011
• Grant date: Oct 31, 2017
• Expiry date: Oct 1, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F2209/42
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method and apparatus are disclosed for treating process water which is loaded with gaseous compounds and/or possibly with solids and comes from a wet-cleaning installation for cleaning process gas, e.g., from a melt-reduction subassembly or from a direct-reduction subassembly. Process water is introduced in a tank in a first process stage and degassed on the basis of reduced solubility of the dissolved compounds. The tank has, on its upper side, a gas-collecting chamber, in which the separated-off gases are collected and from which these are discharged. Likewise, the treated process water is discharged from the tank via a drainage means.