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1. WO1997029804 - PROCESS FOR STABILIZATION OF HEAVY METALS IN ASH

Publication Number WO/1997/029804
Publication Date 21.08.1997
International Application No. PCT/IB1997/000217
International Filing Date 16.01.1997
Chapter 2 Demand Filed 26.08.1997
IPC
A62D 3/00 2007.01
AHUMAN NECESSITIES
62LIFE-SAVING; FIRE-FIGHTING
DCHEMICAL MEANS FOR EXTINGUISHING FIRES; PROCESSES FOR MAKING HARMFUL CHEMICAL SUBSTANCES HARMLESS, OR LESS HARMFUL, BY EFFECTING A CHEMICAL CHANGE; COMPOSITION OF MATERIALS FOR COVERINGS OR CLOTHING FOR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; COMPOSITION OF MATERIALS FOR TRANSPARENT PARTS OF GAS-MASKS, RESPIRATORS, BREATHING BAGS OR HELMETS; COMPOSITION OF CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
3Processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances
B09B 3/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
BDISPOSAL OF SOLID WASTE
3Destroying solid waste or transforming solid waste into something useful or harmless
CPC
A62D 2101/08
AHUMAN NECESSITIES
62LIFE-SAVING; FIRE-FIGHTING
DCHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
2101Harmful chemical substances made harmless, or less harmful, by effecting chemical change
08Toxic combustion residues, e.g. toxic substances contained in fly ash from waste incineration
A62D 2101/43
AHUMAN NECESSITIES
62LIFE-SAVING; FIRE-FIGHTING
DCHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
2101Harmful chemical substances made harmless, or less harmful, by effecting chemical change
40Inorganic substances
43containing heavy metals, in the bonded or free state
A62D 3/33
AHUMAN NECESSITIES
62LIFE-SAVING; FIRE-FIGHTING
DCHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
3Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
30by reacting with chemical agents
33by chemical fixing the harmful substance, e.g. by chelation or complexation
B09B 3/0041
BPERFORMING OPERATIONS; TRANSPORTING
09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
BDISPOSAL OF SOLID WASTE
3Destroying solid waste or transforming solid waste ; or contaminated solids; into something useful or harmless
0025Agglomeration, binding or encapsulation of solid waste
0041using a mineral binder or matrix, e.g. to obtain a soil like material
Y10S 588/901
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
588Hazardous or toxic waste destruction or containment
901Compositions
Applicants
  • ASHLAND INC. [US]/[US]
Inventors
  • FIX, Kathleen, Ann
  • KRAMER, Mark, Gerard
Agents
  • HEDDEN, David, L.
Priority Data
08/601,48414.02.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PROCESS FOR STABILIZATION OF HEAVY METALS IN ASH
(FR) PROCESSUS DE STABILISATION DE METAUX LOURDS DANS DES CENDRES
Abstract
(EN)
This invention relates to a process for stabilizing heavy metals in ash. The steps of the process include: (a) preparing an aqueous slurry of ash and water; (b) decreasing the pH of the aqueous slurry to less than about 5.0 in the presence of an iron salt; (c) treating the aqueous slurry with (1) an organo sulfur containing compound, (2) an alkaline extract of peat moss, and (3) an alkaline earth metal containing compound. Heavy metals in ash treated by this process will not leach into the environment.
(FR)
Cette invention concerne un processus de stabilisation de métaux lourds dans des cendres, lequel processus comprend les étapes suivantes consistant: (a) à préparer une bouillie aqueuse de cendres et d'eau; (b) à faire descendre le pH de la bouillie aqueuse en dessous de 5,0, environ, en présence d'un sel de fer; et (c) à traiter la bouillie aqueuse à l'aide (1) d'un composé contenant un soufre organique, (2) d'un extrait alcalin de mousse de tourbe et (3) d'un composé contenant un métal alcalino-terreux. Les métaux lourds présents dans les cendres et traités d'après ce processus, ne peuvent s'épandre dans le milieu environnant.
Also published as
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