Process of treating the gasification residue formed by the gasification of solid fuels in a fluidized bed

US5635147A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Peter Herbert · Berlin, DE
• Rainer Reimert · Idstein, DE
• Michael Ströder · Neu-Anspach, DE

Key dates

• Filing date: Mar 23, 1995
• Grant date: Jun 3, 1997
• Expiry date: Mar 23, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10J2300/1807
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

In addition to ash and coke, the gasification residue contains alkaline earth metal sulfide and alkaline earth metal oxide because desulfuring agents have been supplied to the gasifier. At temperatures from 5.degree. to 80.degree. C. the gasification residue is mixed with an acid-containing aqueous solution so that a gas which is rich in H.sub.2 S is produced. Ash, coke, and alkaline earth metal salt are supplied to a flotation zone, in which coke is separated. A solid residue which contains ash and alkaline earth metal salt is withdrawn from the flotation zone. Carbonic acid or dilute sulfuric acid is preferably used as an acid.