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Title: Process to stabilize scrubber sludge

Abstract

A process for stabilizing sludge containing flyash and calcium sulfate formed by a lime or limestone scrubber increases the sludge particles to a size at which leaching of toxic metals from the particles no longer occurs at toxic levels. The sludge is dewatered and injected into the furnace in a manner to cause the flyash to soften and stick together. The agglomerated particles then fall into a bottom ash pit for removal as a common waste. 4 figs.

Inventors:
; ;
Publication Date:
OSTI Identifier:
7146336
Patent Number(s):
US 5276254; A
Application Number:
PPN: US 7-868701
Assignee:
Consolidated Natural Gas Service Co., Inc., Pittsburgh, PA (United States) PTO; EDB-94-154748
Resource Type:
Patent
Resource Relation:
Patent File Date: 15 Apr 1992
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; METALS; LAND POLLUTION CONTROL; SLUDGES; AGGLOMERATION; CALCIUM SULFATES; FLY ASH; SCRUBBERS; STABILIZATION; TOXIC MATERIALS; AEROSOL WASTES; ALKALINE EARTH METAL COMPOUNDS; ASHES; CALCIUM COMPOUNDS; COMBUSTION PRODUCTS; CONTROL; ELEMENTS; EQUIPMENT; HAZARDOUS MATERIALS; MATERIALS; OXYGEN COMPOUNDS; POLLUTION CONTROL; POLLUTION CONTROL EQUIPMENT; RESIDUES; SULFATES; SULFUR COMPOUNDS; WASTES; 540120* - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Breen, B.P., Gabrielson, J.E., and Schrecengost, R.A. Process to stabilize scrubber sludge. United States: N. p., 1994. Web.
Breen, B.P., Gabrielson, J.E., & Schrecengost, R.A. Process to stabilize scrubber sludge. United States.
Breen, B.P., Gabrielson, J.E., and Schrecengost, R.A. Tue . "Process to stabilize scrubber sludge". United States. doi:.
@article{osti_7146336,
title = {Process to stabilize scrubber sludge},
author = {Breen, B.P. and Gabrielson, J.E. and Schrecengost, R.A.},
abstractNote = {A process for stabilizing sludge containing flyash and calcium sulfate formed by a lime or limestone scrubber increases the sludge particles to a size at which leaching of toxic metals from the particles no longer occurs at toxic levels. The sludge is dewatered and injected into the furnace in a manner to cause the flyash to soften and stick together. The agglomerated particles then fall into a bottom ash pit for removal as a common waste. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 04 00:00:00 EST 1994},
month = {Tue Jan 04 00:00:00 EST 1994}
}
  • The invention discloses methods of making finely divided products from fly ash compositions, including both dry fly ash compositions and aqueous suspensions of fly ash in combination with alkaline earth metal compounds. The fly ash composition, preferably including 10 to 50% combined alkaline earth metal oxides, is heated to molten condition while collecting gases evolving therefrom, including sulfur oxide gases. The top portion of the melt is then poured in a manner causing a molten stream thereof to be divided into a multiplicity of fractions and cooled to solid form while encompassed by a fluid cooling medium in a mannermore » to produce either a shot or a granulated aggregate product. The bottom portion of the melt is nearly pure metallic iron which is recovered, as such, for other uses. Preferably, the molten stream impinges on a rotating member in a manner to produce shot, or is quenched in a water bath to form a granulated type product. 1 claim.« less
  • This patent describes a method of processing fly ash material having bulk silicates, magnesium, magnetic iron and aluminum components therein. It comprises: removing a magnetic component; extracting the non-magnetic component; separating the sludge residue; subjecting the sludge residue to an aqueous ammonium carbonate extraction; cooling an acid liquor; separating the cooled acid liquor; extracting a crude solid precipitate; separating the aqueous solution; and extracting the solid precipitate.
  • This patent describes a process for the removal of total reduced sulfur compounds and recovery of non-magnetic entrained particulates from an industrial gas. It comprises: scrubbing the industrial gas with an aqueous absorbent slurry containing activated manganese dioxide absorbent particles in a reaction zone to effect oxidation of the total reduced sulfur compounds and recovery of total reduced sulfur compound oxidation products and the nonmagnetic entrained particulates in the aqueous absorbent slurry; recovering from the reaction zone the aqueous absorbent slurry containing manganese dioxide absorbent particles, reduced manganous compounds, total reduced sulfur compound oxidation products and non-magnetic entrained particulates.