Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Halogenous component
Patent
1984-06-06
1986-10-14
Doll, John
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Halogenous component
423242, 4232155, 423234, 423 92, 423 98, 423101, 423109, 423140, 423150, 75101R, 75108, 55 37, 55 51, 55 71, 55 72, 55228, 55233, 55DIG30, B01D 5300
Patent
active
046171800
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.
REFERENCES:
patent: 3789109 (1974-01-01), Lyon et al.
patent: 3791812 (1974-02-01), Frank et al.
patent: 3969482 (1976-07-01), Teller
patent: 4013455 (1977-03-01), Kleeberg et al.
patent: 4124462 (1978-11-01), Reinhardt et al.
patent: 4297332 (1981-10-01), Tantani et al.
Abfallwirthschaft an der TU Berlin, vol. 7, pp. 1-41.
Doll John
Kernforschungszentrum Karlsruhe GmbH
Stoll Bob
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