The invention relates to a method for producing a binder from slag for conditioning sludges/dredged material, soils containing water and for the neutralization of acids. According to the invention, the slag from a waste incinerator is crushed, then metal is removed and the crushed slag is graded into a fraction greater than 2.0-3.0 mm and a fraction smaller than 2.0-3.0 mm, the fraction 0/2.0-0/3.0 mm is dried in a dryer to a terminal humidity less than 1.5 wt. %-2.5 wt. %, as a result of which the pozzolanic properties of the slag are reactivated, the yield from the dryer is further crushed in a high-speed impact mill to a stable cubic grain structure and the metal released in this process is removed, and the 0/500-0/750 m fraction forming the binder is separated from this crushed slag.

The invention relates to a method for producing a binder from slag for conditioning sludges/dredged material, soils containing water and for the neutralization of acids. According to the invention, the slag from a waste incinerator is crushed, then metal is removed and the crushed slag is graded into a fraction greater than 2.0-3.0 mm and a fraction smaller than 2.0-3.0 mm, the fraction 0/2.0-0/3.0 mm is dried in a dryer to a terminal humidity less than 1.5 wt. %-2.5 wt. %, as a result of which the pozzolanic properties of the slag are reactivated, the yield from the dryer is further crushed in a high-speed impact mill to a stable cubic grain structure and the metal released in this process is removed, and the 0/500-0/750 m fraction forming the binder is separated from this crushed slag.

An apparatus and method to efficiently recover noble metals such as gold, silver and copper and aluminum from incineration ash, and effectively use ash after recovering the noble metals and others. An incineration ash treatment apparatus 1 including: a crusher for crushing an incineration ash A1 to be less or equal to 5 mm in maximum particle diameter, or/and a classifier for classifying an incineration ash to obtain an incineration ash whose maximum particle diameter is less or equal to 5 mm; an eddy current separator 8 for separating an incineration ash whose maximum particle diameter is less or equal to 5 mm discharged from the crusher or/and the classifier into a conductor E and a nonconductor I; a specific gravity separator for separating a conductor discharged from the eddy current separator 8 into a high gravity material H2 and a low gravity material L2. The specific gravity separator can be an air table 10. A classifier for classifying a crushed material C, classifying point of which is 5 mm or less, can be mounted, and fine particles P whose particle diameters are 5 mm or less discharged from the classifier can be fed to the eddy current separator 8. Rotation speed of a drum of the eddy current separator 8 can be 4000 rpm or more.

An apparatus and method to efficiently recover noble metals such as gold, silver and copper and aluminum from incineration ash, and effectively use ash after recovering the noble metals and others. An incineration ash treatment apparatus 1 including: a crusher for crushing an incineration ash A1 to be less or equal to 5 mm in maximum particle diameter, or/and a classifier for classifying an incineration ash to obtain an incineration ash whose maximum particle diameter is less or equal to 5 mm; an eddy current separator 8 for separating an incineration ash whose maximum particle diameter is less or equal to 5 mm discharged from the crusher or/and the classifier into a conductor E and a nonconductor I; a specific gravity separator for separating a conductor discharged from the eddy current separator 8 into a high gravity material H2 and a low gravity material L2. The specific gravity separator can be an air table 10. A classifier for classifying a crushed material C, classifying point of which is 5 mm or less, can be mounted, and fine particles P whose particle diameters are 5 mm or less discharged from the classifier can be fed to the eddy current separator 8. Rotation speed of a drum of the eddy current separator 8 can be 4000 rpm or more.

A process for producing a modified fly ash comprising the steps of providing, as a raw material, the raw fly ash discharged from a pulverized coal combustion boiler; classifying the raw fly ash into a crude powder and a fine powder; removing the unburned carbon contained in the crude powder by heating the crude powder at a temperature in a range of 500 to 1000 C.; and mixing together the crude powder from which the unburned carbon has been removed and the fine powder to obtain a modified fly ash.

A process for producing a modified fly ash comprising the steps of providing, as a raw material, the raw fly ash discharged from a pulverized coal combustion boiler; classifying the raw fly ash into a crude powder and a fine powder; removing the unburned carbon contained in the crude powder by heating the crude powder at a temperature in a range of 500 to 1000 C.; and mixing together the crude powder from which the unburned carbon has been removed and the fine powder to obtain a modified fly ash.

A process for synthesis of a waste-derived CO.sub.2-activated clinker, which comprises firing nodules at temperatures between 1000-1100? C. for a time sufficient to obtain CO.sub.2-reactive clinker phases within the nodules, cooling the clinker nodules, and reducing to powder to obtain a clinker powder; wherein the nodules are agglomerates of a stoichiometric mix of uniformly-sized powders of municipal solid waste (MSW) incineration residues; wherein the stoichiometric mix respects the primary compositional requisite of containing Ca, Al, and Si in their oxide forms within the ranges of 35-45 wt. % CaO, 2-8 wt. % AI.sub.2O.sub.3, and 12-20 wt. % SiO.sub.2; wherein the final stoichiometric mix has a total-sulfur content of 1 to 10 wt. %, total-carbon content of 2 to 20 wt. %, and a total-chlorine content of 2 to 15 wt. %.

A process for synthesis of a waste-derived CO.sub.2-activated clinker, which comprises firing nodules at temperatures between 1000-1100? C. for a time sufficient to obtain CO.sub.2-reactive clinker phases within the nodules, cooling the clinker nodules, and reducing to powder to obtain a clinker powder; wherein the nodules are agglomerates of a stoichiometric mix of uniformly-sized powders of municipal solid waste (MSW) incineration residues; wherein the stoichiometric mix respects the primary compositional requisite of containing Ca, Al, and Si in their oxide forms within the ranges of 35-45 wt. % CaO, 2-8 wt. % AI.sub.2O.sub.3, and 12-20 wt. % SiO.sub.2; wherein the final stoichiometric mix has a total-sulfur content of 1 to 10 wt. %, total-carbon content of 2 to 20 wt. %, and a total-chlorine content of 2 to 15 wt. %.

Disclosed herein are a lightweight geopolymer foam with low thermal conductivity and a manufacturing method therefor in which coal bottom ash and fly ash are used together as materials for the geopolymer foam and silica fume is added to a mixed solution of an alkali activator and sodium hydroxide. The geopolymer foam can be utilized for improving insulation performance and safety for a structure constructed with eco-friendly cement.

Disclosed herein are a lightweight geopolymer foam with low thermal conductivity and a manufacturing method therefor in which coal bottom ash and fly ash are used together as materials for the geopolymer foam and silica fume is added to a mixed solution of an alkali activator and sodium hydroxide. The geopolymer foam can be utilized for improving insulation performance and safety for a structure constructed with eco-friendly cement.