Process for purifying flue gas
US4617180A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1984 |
| Grant date | Oct 14, 1986 |
| Priority date | — |
| Expiry date | Jun 6, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S75/961
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a process for purifying flue gases developed during the combustion of waste materials and containing solids of various compositions as well as pollutant gases and heavy metals in gaseous form, wherein the primarily solid components are removed from the flue gas in a separating system and are collected as flue ashes and wherein the flue gas is washed for the purpose of binding the pollutant gases of the residual solids components, particularly in the slag. It is the object of the present invention to provide a process wherein, during flue gas purification, the gaseous heavy metal contaminants as well as the heavy metal contaminants which are present in the flue ash and in the slag in soluble form, can be removed from the flue gas purification process in the most compact form, with simultaneously achieving good, or even improved, initial purification of HCl, SO.sub.2. NO.sub.x. All other residues should be returnable for further use. The remainder of heavy metal components which are not bound in the slag are isolated from the slag by a subsequent weakly acid treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.