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1. WO1998024733 - WET PROCESS FLY ASH BENEFICIATION

Publication Number WO/1998/024733
Publication Date 11.06.1998
International Application No. PCT/US1997/022010
International Filing Date 03.12.1997
Chapter 2 Demand Filed 18.06.1998
IPC
C04B 18/08 2006.1
CCHEMISTRY; METALLURGY
04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
BLIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
18Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
04Waste materials; Refuse
06Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
08Flue dust
CPC
C04B 18/08
CCHEMISTRY; METALLURGY
04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE
18Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone
04Waste materials; Refuse
06Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
08Flue dust ; , i.e. fly ash
Y02W 30/91
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
30Technologies for solid waste management
50Reuse, recycling or recovery technologies
91Use of waste materials as fillers for mortars or concrete
Applicants
  • ISG RESOURCES, INC. [US]/[US]
Inventors
  • PIKE, Clinton, W.
  • HEAVILON, Jerry, L.
Agents
  • HENDERSON, Gilbert, N.
Priority Data
08/760,04604.12.1996US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) WET PROCESS FLY ASH BENEFICIATION
(FR) PREPARATION DE CENDRES VOLANTES SELON UN PROCEDE PAR VOIE HUMIDE
Abstract
(EN) The method of making an enhanced pozzolan from fly ash which contains a substantial carbon content includes screening (11) the raw fly ash and using conditioning agents, applying the ash to a first set of flotation tanks (15) for removing a carbon rich fraction and a non-carbon rich fraction, subjecting the carbon rich fraction to attrition milling (20) to fraction the carbon particles and to release microspheres captured within the carbon vesicles, applying the milled carbon rich fraction to a second bank of flotation cells (22) and separating a second carbon rich fraction which contains fractured carbon particles and carbon particles which have been reduced in size and a second non-carbon fraction containing mainly fly ash microspheres, combining the non-carbon fraction containing mainly fly ash microspheres, combining the non-carbon fractions and drying these fractions in a heated screw-type dryer (30) and breaking up any agglomeration of particles providing a reactive fly ash pozzolan which contains a substantial portion of fine particles including microspheres.
(FR) L'invention porte sur un procédé de fabrication d'un ciment pouzzolanique amélioré, à partir de cendres volantes ayant une importante teneur en carbone. Ce procédé consiste à tamiser (11) la cendre volante brute et à utiliser des agents de conditionnement, appliquer la cendre sur un premier ensemble de cuves de flottation (15) de façon à retirer une fraction riche en carbone et une fraction sans carbone, soumettre la fraction riche en carbone à broyeur par frottement (20) de façon à fractionner les particules de carbone et libérer des microsphères piégées dans les vésicules de carbone, appliquer la fraction riche en carbone broyée sur un second banc de cellules de flottation (22) et séparer une seconde fraction riche en carbone contenant des particules de carbone fractionnées et des particules de carbone dont la taille a été réduite, et une seconde fraction sans carbone contenant principalement des microsphères de cendres volantes, combiner les fractions sans carbone et les sécher dans un séchoir du type séchoir à hélice chauffé (30) et briser toute agglomération de particules formant un ciment pouzzolanique réactif de cendres volantes qui contient une partie appréciable de particules fines comprenant des microsphères.
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