Process for cleaning mercury-containing gaseous emissions
AssigneeTokyo Metropolitan Environmental Service Corporation
InventorsAkira Ide, Tsutomu Shigenaka, Masayuki Kokado, Shigeru Kondo
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Abstract
A process for cleaning gaseous emissions containing mercury (Hg) comprises the steps of adding a chlorine-containing material to the mercury-containing gaseous emissions and heating the mixture to convert the mercury into water-soluble mercuric chloride (HgCl.sub.2); scrubbing the water-soluble mercuric chloride with wash water and fixing the same as chlorocomplex ion (HgCl.sub.4.sup.-2) stable in liquid; and thereafter subjecting the washings from the scrubbing step to coagulating sedimentation and thereby fixing and insolubilizing the mercury in the resulting sludge.
Claims6
A process for cleaning gaseous emmissions congaining mercury which are produced by a municipal refuse incinerator comprises the steps of:
- (a) heating mercury-containing waste in a vessel thereby transforming the mercury into a gaseous phase;
- (b) adding a chlorine-containing material to said vessel;
- (c) heating said material with said gaseous phase in said vessel, whereby a water-soluble mercuric chloride (HgCl.sub.2) is formed in a vessel effluent;
- (d) scrubbing said vessel effluent having the water-soluble mercuric chloride with a wash water containing a liquid chelate and a metal salt, thereby forming a chlorocomplex ion (HgCl.sub.4.sup.-2) in said wash water;
- and
- (e) sedimentation coagulating said wash water containing said chloromcomplex ion, thereby fixing and insolubilizing the mercury in a resulting sludge.
Dependencies are inferred from the claim text.