WO2006074944A1 - Agregats pyrotraites comprenant des cendres de fond d'incinerateur et des cendres volantes et procedes pour produire de tels agregats - Google Patents

Agregats pyrotraites comprenant des cendres de fond d'incinerateur et des cendres volantes et procedes pour produire de tels agregats Download PDF

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WO2006074944A1
WO2006074944A1 PCT/EP2006/000270 EP2006000270W WO2006074944A1 WO 2006074944 A1 WO2006074944 A1 WO 2006074944A1 EP 2006000270 W EP2006000270 W EP 2006000270W WO 2006074944 A1 WO2006074944 A1 WO 2006074944A1
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iba
pfa
mixture
aggregate
dry weight
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PCT/EP2006/000270
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English (en)
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Sophia Bethani
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Alkemy Ltd.
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Priority claimed from GR20050100015A external-priority patent/GR1006855B/el
Application filed by Alkemy Ltd. filed Critical Alkemy Ltd.
Priority to EP20060706228 priority Critical patent/EP1841712A1/fr
Publication of WO2006074944A1 publication Critical patent/WO2006074944A1/fr

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    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/628—Coating the powders or the macroscopic reinforcing agents
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    • C04B18/00—Use 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
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
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    • C04B33/02—Preparing or treating the raw materials individually or as batches
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    • C04B33/132—Waste materials; Refuse; Residues
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    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
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    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • pyroprocessed products and processes therefor and, more particularly, pyroprocessed aggregates comprising incinerator bottom ash from municipal solid waste incinerators ("IBA") and pulverized fuel ash from coal combustion (“PFA”), and processes for making such aggregates.
  • the aggregates may be sintered or vitrified lightweight and normal weight aggregates.
  • Such aggregates may be used in concrete, masonry, or insulation, for example.
  • Aggregates which are essential ingredients of concrete, may be derived from natural sources with minimal processing or from naturally occurring materials that are heat treated. Aggregates may also be synthetic. Aggregates from natural sources, such as quarries, pits in ground, and riverbeds, for example, are generally composed of rock fragments, gravel, stone, and sand, which may be crushed, washed, and sized for use, as needed. Aggregates from natural materials that may be used to form aggregates include clay, shale, and slate, which are pyroprocessed, causing expansion of the material. OPTIROC and LECA are examples of commercially available expanded clay aggregates, for example. Synthetic aggregates may comprise industrial byproducts, which may be waste materials.
  • LYTAG for example, is a commercially available sintered aggregate comprising pulverized fuel ash ("PFA"), also known as fly ash. PFA is produced from the combustion of coal in power plants, for example.
  • PFA pulverized fuel ash
  • Aggregates may be lightweight or normal weight. Lightweight aggregates
  • LWAs have a particle density of less than 2.0 g/cm 3 or a dry loose bulk density of less than 1.1 g/cm 3 , as defined in ASTM specification C330. Normal weight aggregates from gravel, sand, and crushed stone, for example, have generally bulk specific gravities of from about 2.4 to about 2.9 (both oven-dry and saturated-surface-dry), and bulk densities of up to about 1.7 g/cm 3 .
  • High quality LWAs have a strong but low density porous ceramic core of uniform structural strength and a dense, continuous, relatively impermeable surface layer to inhibit water absorption. They are physically stable, durable, and environmentally inert. LWAs should also be nearly spherical, to improve concrete properties and provide good adherence to concrete paste.
  • Suitable sizes for incorporation in concrete are in a range of from about 4.75 mm to about 25 mm, or 2.36 mm to 9.5 mm for coarse aggregates, in accordance with ASTM Specification C330. Smaller, fine aggregates, which are a byproduct of LWA production, may also be used, to replace sand in concrete, for example.
  • LWAs should have a sufficient crushing strength and resistance to fragmentation so that the resulting concrete has a strength of greater than 10 MPa and a dry density in a range of about 1.5 g/cm 3 to about 2.0 g/cm 3 .
  • Concrete containing LWAs (“LWA concrete") may also have a density as low as about 0.3 g/cm 3 .
  • LWA concrete may be 20-30% lighter than conventional concrete, it may be just as strong. Even when it is not as strong as conventional concrete, the LWA concrete may have reduced structural dead loads enabling the use of longer spans, narrower cross-sections, and reduced reinforcement in structures. The lower weight of the LWA concrete facilitates handling and reduces transport, equipment, and manpower costs. LWA concrete may be particularly useful in construction slabs in high rise buildings and in concrete arch bridges, for example. LWA concrete may also have improved insulating properties, freeze-thaw performance, fire resistance, and sound reduction. LWAs can also be used in the construction of other structures, in highways, and as soil Fillers, for example. [0005] Quarrying is the largest source of aggregates by volume in most countries.
  • waste disposal is another area presenting significant environmental and legal issues. Due to the exhaustion of available landfill sites, the difficulties in acquiring new sites, the adverse environmental effects, and the costs of landfilling, disposal of waste materials has been a significant problem for many years. For example, a significant amount of incinerator bottom ash (“IBA”), which is the principal ash stream generated from municipal solid waste (“MSW”) incineration, is generated and needs to be disposed. IBA accounts for about 75% to about 80% of the total weight of MSW incinerator residues.
  • IBA incinerator bottom ash
  • IBA comprises a heterogeneous mixture of slag, glass, ceramics, ferrous and nonferrous metals, minerals, other non- combustibles, and unburnt organic matter.
  • IBA is currently used in its raw form (without heat treatment) in the construction of fills and embankments, pavement base and road sub-base courses, soil stabilization, landfill cover, in bricks, blocks, and paving stones, and as fillers in particular applications. Although considered a relatively inert waste, leaching of heavy metals in these applications is possible.
  • Concrete containing IBA is weaker than concrete incorporating LYTAG, for example.
  • the IBA may also chemically react with cement, leading to swelling and cracking.
  • sintered LWAs comprising PFA are commercially available under the tradename LYTAG.
  • Electricity-generating power plants for example, produce large amounts of PFA, which is typically collected as fine-grained particulate material from the furnace in flue gases.
  • ASTM C 618 defines two major classes of PFA, Class F and Class C, on the basis of their chemical composition.
  • Class F PFA which comprises siliceous and sometimes aluminous material, is normally produced from burning anthracite or bituminous coal and has little or no cementitious value.
  • Class C PFA which is normally produced from the burning of subbituminous coal and lignite, usually contains significant amount of calcium hydroxide (CaOH) or lime (CaO).
  • Class C PFA has some cementitious properties. The majority of PFA produced is currently disposed in landfills at a great cost and risk of leakage of heavy metals that could contaminate underground aquifers.
  • U.S. Patent No. 4,120,735 to Smith discloses a method of producing a brick or similarly fired construction unit, such as a ceramic-type tile or vitrified pipe, comprising mixing at least 50% by weight inorganic, non-ferrous residue from municipal incinerators (which generally refers to incinerator bottom ash) with coal fly ash and a binder, such as sodium silicate.
  • the mixture is shaped and then fired in three steps. First, the mixture is heated at 180 0 C for one hour, to ensure that moisture in the mixture is evaporated. Then the mixture is heated in increments of 65°C/minute to 550 0 C and held overnight, to burn off carbon.
  • the mixture is fired at temperatures of from about 1,700 0 F (926 0 C) to about 2,000 0 F (1,093 0 C), to form the brick.
  • Smith emphasizes that the addition of the incinerator residue to the coal fly ash lowered the firing temperature as compared to a coal fly ash brick.
  • Smith states that the incinerator residue, instead of the coal fly ash, melts to produce bonding on cooling. Considerable fusion is said to take place between 1,700 0 F (926°C) and 1,750 0 F (954 0 C).
  • Smith also reports better brick properties as the proportion of incinerator residues increase.
  • a preferred composition is 50% to 60% incinerator residue, 1% to 4% binder, and the remainder coal fly ash.
  • the incinerator residue comprised predominantly glass and possibly incinerator fly ash. Due to the reported strengths, it is also believed that Smith produced a vitrified brick, with a large glassy, amorphous phase. The brick has high strength and low porosity, as the melted glass components of the incinerator residue rilled most pores. [0009] Avoidance of landfill disposal of wastes, such as IBA and PFA, by developing alternative, reuse applications, is needed. The economic burdens and the risks of waste disposal make it advantageous to develop alternative techniques for converting wastes into revenue- earning products that reduce the demand for less accessible, non-renewable materials.
  • IBA incinerator bottom ash from municipal solid waste incinerators
  • IBA may be difficult to pyroprocess into a product having desired characteristics, because IBA sinters and densifies rapidly.
  • IBA contains high concentrations of calcium containing minerals, such as calcium oxides, carbonates, and sulfates, as well as sodium and potassium oxides and sulfates. These minerals act as "fluxes.” It is believed that the fluxes lower the melting point of the remaining compounds in the IBA, causing sintering and densification at lower temperatures than if fluxes were not present.
  • IBA is very variable, making its pyroprocessing behavior unpredictable. Variability in IBA composition may be due to several factors, such as the incineration procedures and variability in the wastes received and processed by the MSW incinerator. The wastes received may vary based on the time of the year and the geographic location where the wastes are generated.
  • Pulverized fuel ash from coal combustion also referred to as "fly ash,” or “PFA” contains lower quantities of low melting point fluxes and higher quantities of high melting point minerals, than IBA.
  • PFA is mixed with IBA to facilitate the production of aggregates, such as lightweight and normal weight aggregates. Without being limited to any particular theory of operation, it is believed that PFA facilitates the production of aggregates by decreasing the amount of fluxes and increasing the amount of refractory minerals in the IBA.
  • a method for producing an aggregate comprising mixing incinerator bottom ash ("IBA") from a municipal solid waste incinerator and pulverized fuel ash (“PFA”) from coal combustion.
  • the method further comprises agglomerating the mixture to form an agglomerate and pyroprocessing the agglomerate to form an aggregate.
  • the IBA may be Class F PFA.
  • the method may further comprise milling the IBA, preferably by wet milling, prior to mixing.
  • the mixture of the IBA and the PFA may also be milled, such as by wet milling, prior to agglomerating.
  • the agglomerating may comprise pelletizing.
  • the water may be removed and used during pelletizing and/or quenching of the pyroprocessed aggregate.
  • the agglomerate may have a diameter of from about 3 mm to about 40 mm, for example.
  • the method may further comprise coating the agglomerates with an inorganic powder.
  • the inorganic powder may be PFA or clay, for example.
  • a plastic binder such as clay may also be mixed with the IBA and the PFA.
  • the term "plastic binder" refers to a binder that has at least some plastic characteristics, such as high plasticity index.
  • the agglomerates are preferably pyroprocessed in a rotary kiln.
  • the aggregate may be a lightweight aggregate or a normal weight aggregate.
  • the aggregates may be pyroprocessed to form a sintered or a vitrified aggregate.
  • the IBA and the PFA may be mixed with an organic material, such as activated carbon waste, to increase the porosity of the aggregate. Up to about 30% by dry weight of the mixture of IBA and the PFA may be organic material, for example.
  • the method may further comprise controlling selected properties of the aggregate, such as density and water absorption, based, at least in part, on a proportion of the IBA to the
  • the method may further comprise controlling selected properties of the aggregate, such as density, based, at least in part, by the addition of the organic material.
  • the method may further comprise mixing from about 5% to about 95% IBA by dry weight of the mixture with from about 95% to about 5% PFA by dry weight of the mixture.
  • IBA by dry weight of the mixture is mixed with from about 70% to about 50% PFA by dry weight of the mixture.
  • a method for producing a sintered lightweight aggregate comprising preparing a mixture comprising IBA and
  • the method may further comprise sintering the agglomerate to form an aggregate having a relative density of less than about 2.0 g/cm 3 .
  • the lightweight aggregate may have a water absorption less than about 40% by dry weight.
  • the agglomerate is preferably sintered in a rotary kiln.
  • the method may further comprise mixing a predetermined proportion of IBA to
  • the method may further comprise pyroprocessing the mixture at a temperature in a range of from about 1,050 0 C to about 1,170 0 C.
  • the method of this embodiment may further comprise the other actions described in the first embodiment.
  • a lightweight sintered aggregate is formed by a process comprising mixing IBA, PFA, and a plastic binder, agglomerating the mixture to form an agglomerate, and sintering the agglomerate.
  • the plastic binder may be clay, for example.
  • a lightweight sintered aggregate comprising IBA, PFA, and a plastic binder.
  • the plastic binder may be clay, for example.
  • a mixture of the IBA, the PFA, and the plastic binder is sintered at a temperature to form the sintered lightweight aggregate.
  • the PFA may comprise Class F PFA.
  • the IBA may comprise from about 5% to about 75% by dry weight of the mixture ("BDWM")
  • the PFA may comprise from about 90% to about 5% BDWM
  • the clay binder may comprise from about 5% to about 20% BDWM.
  • the IBA comprises from about 30% to about 70% BDWM, the PFA comprises from about 60% to about 10% BDWM, and the clay binder comprises from about 10% to about 20% BDWM. More preferably, the IBA comprises from about 30% to about 50% BDWM, the PFA comprises from about 60% to about 35% BDWM, and the clay binder comprises from about 10% to about 15% BDWM. In a preferred composition, the IBA comprises about 40% BDWM, the PFA comprises about 50% BDWM, and the clay binder comprises about 10% BDWM.
  • the lightweight sintered aggregate of this embodiment may have a water absorption of less than about 40%. It may also be chemically inert.
  • an aggregate comprising
  • the aggregate may comprise a pyroprocessed pellet comprising a mixture of the
  • the pyroprocessed pellet may have a diameter of from about 2 mm to about
  • the aggregate may further comprise a plastic binder, such as clay.
  • Embodiments of the invention may provide substantial economic and environmental benefits by reducing the dependence of IBA and PFA, as well as activated carbon waste, on landfill disposal, and providing an alternative to the depletion of natural resources for use as aggregate raw materials.
  • Fig. 1 is a graph of density (g/cm 3 ) versus pyroprocessing temperature ( 0 C) for aggregates comprising IBA, aggregates comprising mixtures of IBA and PFA, and aggregates comprising PFA alone, over a range of about 1,060 0 C to about 1,220 0 C;
  • FIG. 2 is a schematic cross-sectional view of an example of an agglomerate, in accordance with an embodiment of the invention.
  • FIG. 3 is a schematic cross-sectional view of an example of an aggregate resulting from sintering the agglomerate, in accordance with an embodiment of the invention
  • Fig. 4 is a scanning electron microscope image at a magnification of 350x, of a cross-section of a sintered aggregate, in accordance with an embodiment of the invention
  • Fig. 5 is a schematic cross-sectional view of a vitrified aggregate, in accordance with another embodiment of the invention
  • Fig. 6 is an example of a method of manufacturing aggregates, in accordance with an embodiment of the invention.
  • Fig. 7 is an example of plurality of sintered aggregates, made in accordance with embodiments of the invention.
  • Fig. 8 is another example of a process for making aggregates, in accordance with an embodiment of the invention, in which the PFA and optionally organic material and/or a clay binder are mixed with the raw IBA, so that both materials are subjected to wet milling together;
  • Figs. 9a-9h show the results of leaching tests performed on aggregates, in accordance with embodiments of the present invention and commercial aggregates;
  • Fig. 10 shows the particle size distribution of raw IBA and PFA and wet milled
  • Figs. 1 Ia-I Ic show selected results of leaching tests performed on aggregates, in accordance with embodiments of the present invention and commercial aggregates.
  • Fig. 1 is a graph of density (g/cm 3 ) versus pyroprocesing temperature ( 0 C) for aggregates comprising IBA, aggregates comprising mixtures of IBA and PFA, and aggregates comprising PFA alone, over a range of about 1,060 0 C to about 1,22O 0 C.
  • Curve A corresponding to 100% IBA, shows that as temperature increases from about 1,060 0 C to about 1,100 0 C, density increases from a low of about 1.3 g/cm 3 to a maximum density of about 2.6 g/cm 3 . As temperature increases from 1,100 0 C to 1,120 0 C, density decreases from the maximum density of 2.6 g/cm 3 to 1.6 g/cm 3 . Aggregates with densities of 2.0 g/cm 3 and below are referred to as lightweight aggregates while aggregates with densities above 2.0 g/cm 3 are referred to as normal weight aggregates.
  • the sintering temperature in order to produce a sintered lightweight aggregate comprising 100% IBA having a density in a range of about 1.5 g/cm 3 to about 1.8 g/cm 3 , the sintering temperature must be within a range of from about 1,070 0 C to about 1,080 0 C, which is only 1O 0 C wide. This is believed to be caused by the presence of high amounts of fluxing agents.
  • variations in the composition of a given sample of IBA cause significant variations in the behavior of different IBA samples during heating. The relationship between temperature and density for different IBA samples may therefore vary widely. Consequently, it is very difficult to achieve an IBA end product having desired characteristics of density, porosity, water absorption, etc.
  • the inability to control the densification behavior of IBA with temperature is a significant obstacle in the production of aggregates of required properties in large-scale production.
  • PFA comprises more refractory minerals, such as silica and alumina, and more particularly quartz and mullite, and lesser amounts of fluxing agents, such as calcium, magnesium, potassium, and sodium oxides, than IBA. It has been found that mixing IBA with PFA in specific proportions modifies the rapid densification behavior of IBA in a predictable manner, resulting in a broader temperature interval between the initial softening, sintering, and melting of the material sample by changing the chemical composition and mineralogy of the material. Since refractory minerals in the PFA sinter and melt at higher temperatures due to their higher melting points than the fluxing agents in the IBA, as the amount of PFA added to the IBA increases, the mixture sinters and melts at higher temperatures.
  • fluxing agents such as calcium, magnesium, potassium, and sodium oxides
  • the sintering temperature may be within a range of about 20° (about 1 ,100 0 C to about 1,120 0 C).
  • similar densities may be achieved at a sintering temperature within a 50 0 C range of from 1,100 0 C-1, 150 0 C.
  • a sample of IBA may have more and possibly less calcium containing minerals and other fluxing minerals than the IBA used here (the composition of the IBA used here is given in Example 1, below).
  • an aggregate may be formed by mixing predetermined amounts of IBA and PFA, agglomerating the mixture, and pyroprocessing the agglomerate at a selected temperature.
  • the temperature may be selected based, at least in part, on the proportion of IBA to PFA, to make a pyroprocessed aggregate having desired density and other properties, such as water absorption and/or strength, based on data such as that graphically represented in Fig. 1.
  • Sintering is preferred.
  • the IBA may be milled prior to sintering, to improve its particle size distribution for processing.
  • the PFA is also milled.
  • the IBA and the PFA may be milled together. Wet milling is preferred.
  • the mixture is also preferably agglomerated prior to sintering, to create agglomerates having a desired size and shape to form the sintered aggregate 20.
  • Pelletization is a preferred agglomeration method. [0042] Fig.
  • FIG. 2 is a schematic cross-sectional view of an example of an agglomerate 10 in accordance with an embodiment of the invention, which comprises PFA particles 12, IBA particles 14, and pores 16.
  • Particles 18 of a plastic binder, such a clay binder may also be included, to enhance the physical bonding of the PFA particles 12 and the IBA particles 14, and to improve the integrity of the agglomerate 10, as is discussed further.
  • fluxing minerals such as calcium oxide, sodium oxide, and other compounds with melting points below the processing temperature in the original grain particles of IBA 14 and PFA particles 12, melt and flow into the pores 16, as discussed above.
  • Fig. 3 is a schematic cross-sectional view of an example of an aggregate 20 resulting from sintering the agglomerate 10, in accordance with an embodiment of the invention.
  • the aggregate 20 comprises a mixture of IBA, PFA, and optionally plastic binder, hi this example, the agglomerate 10 is sintered at a temperature of from about 1,060 0 C to about 1,220 0 C, depending on the proportion of IBA to PFA and the desired density and/or other characteristics.
  • the structure of the aggregate 20 comprises a plurality of grains 22 bonded to each other through a partly glassy and partly crystallized matrix 24, resulting from the melting or crystallization of the components with temperature.
  • the grains 22 may comprise silica, alumina, and other minerals with melting points above the processing temperature.
  • the grains 22 fully or paztially crystallize during sintering, providing an additional bond between the grains 22.
  • the aggregate 20 comprise a dense, continuous, relatively impermeable surface layer 26, resulting from the optional coating of the agglomerate 10 with PFA or other inorganic material, as discussed further below.
  • Internal pores 28, which may be channel like, and small surface pores 28a, which may be microscopic, are also present.
  • the surface pores 28a may connect with the internal pores 28, enabling the aggregate 20 to absorb water. The degree of water absorption is indicative of the volume and connectivity of the pores of the aggregate. Fig.
  • FIG. 4 is a scanning electron microscope image at a magnification of 35Ox, of a cross-section of a sintered aggregate 20, comprising 40% IBA and 60% PFA by weight, sintered at a temperature of 1,12O 0 C, in accordance with an embodiment of the invention. Interconnected pores are shown.
  • Fig. 5 is a schematic cross-sectional view of a vitrified aggregate 30, in accordance with another embodiment of the invention, which comprises fewer grains 22 and a larger matrix 24. Vitrification results from pyroprocessing of the agglomerate 10 at or above the temperature of maximum densification for the particular proportions of IBA to PFA, where most of the components of the agglomerate melt.
  • LWAs Highly porous lightweight aggregates having densities as low as about
  • an organic material may be introduced into the TBAfPfA mix.
  • the organic material may be a waste organic material, such as activated carbon waste ("ACW"), or any waste from agricultural, forestry, or industrial sources that has very high concentrations of carbon.
  • ACW activated carbon waste
  • Activated carbon results from the controlled combustion of carbonaceous material, such as wood, coal or peat. It is used as a filter in water treatment to absorb contaminants.
  • Activated carbon waste is the spent activated carbon after it has been used. Starch may be used, as well.
  • the organic material burns off during firing, increasing the porosity of the resultant aggregates, and decreasing their densities.
  • Lightweight aggregates with densities as low as 0.5 g/cm 3 may be produced by adding organic waste.
  • Aggregate production with IBA, PFA, and ACW presents a further advantageous reuse application for all three waste products.
  • Fig. 6 is an example of a method 100 of manufacturing aggregates in accordance with an embodiment of the invention.
  • IBA is added to a barrel of a ball mill in Step 105 and is milled with water, in Step 110. Milling is used to reduce the particle size distribution of the IBA to a distribution that is fine, to improve sinterability.
  • Powders with fine particle size distributions have advantageous sintering characteristics because the high surface area to volume ratio increases diffusion of small particles through the liquid phase to the larger particles and because the powders are better distributed throughout the compact, with good packing densities.
  • the resulting particles preferably have a mean particle size of about 45 microns and less, for example.
  • wet milling is preferred because it has been found to provide more uniform particle size distribution, hi addition, the liquids used in the wet milling process tend to break up agglomerates and reduce welding of powder particles.
  • the IBA may be dry milled in a hammer mill, for example.
  • Wet milling may take place in a closed, moving cylindrical container, for example, wherein spherical grinding media, such as aluminum spheres, in a liquid medium, such as water or alcohol, apply sufficient force to break particles suspended in the medium. Movement may be imparted to the grinding media by tumbling, vibration, planetary rotation, and/or agitation.
  • the most important variables controlling the powder particle size distribution is the speed of milling (rpm), the milling time, the amount of grinding media, the amount of liquid, and the initial particle size of the raw material. About twice as much liquid (by weight) as IBA (by weight) is preferably provided.
  • the milling media may be aluminum spheres that have a total weight of about four to five times that of the IBA.
  • the container should be at least half filled with the grinding media.
  • Steel spheres may be used instead of aluminum.
  • the spheres preferably have a small diameter, such as from about 0.5 inches (12.7 mm) to about 5/8 inches (15.9 mm). Milling may take place for about 8 hours, for example.
  • the wet milled IBA is separated to remove large particles through a sieve, for example, in Step 115. The presence of large particles may interfere with the formation of homogenous pellets. Separation may take place in multiple steps, hi one example, the IBA may be mechanically shaken in series over ASTM standard stainless steel mesh screens having openings of 3.35 mm, 1.70 mm, 355 microns, and 150 microns. The IBA fraction having particle sizes less than 355 microns is further processed.
  • Step 125 Preferably, all the free water is removed.
  • the water removed is referred to as effluent, which may be used in pelletizing Step 150 and/or in quenching Step 165, which are discussed further below. It has been found that while sodium and potassium salts leached into the effluent, heavy metals did not. The water is therefore safe to use. It is believed that the heavy metals did not leach because they were bound to low solubility carbonates and/or silicates. Water may be removed in a filter press or other filtration apparatus, for example. Dewatering results in formation of a solid moist cake residue, in Step 130.
  • the cake is dried and ground, in Step 135. This step converts the cake into a powder.
  • the cake may be dried in an oven at 110 0 C, for example.
  • the powder may be ground by a mortar and pestle, for example, hi large-scale production, the dry solid cake may be ground to a powder in a mixer with blades or a dry hammer mill, for example.
  • the ground IBA powder is thoroughly mixed with PFA, in Step 140.
  • PFA Preferably, about 95% to about 5% PFA by dry weight is mixed with the IBA. More preferably, from about 70% to about 30% PFA by dry weight is added. More preferably, 70% to about 50% PFA by dry weight is added. Most preferably, 60% PFA by dry weight is added.
  • Organic material such as an organic waste, may also be added in Step 140, if desired, to increase porosity in the sintered aggregate 20. Up to about 30% by dry weight of the IBA/PFA mixture may be added.
  • a plastic binder such as a clay, may optionally be added in Step 140, to enhance the physical bonding of individual particles during pelletization and to improve the pellet integrity.
  • plastic binder is used herein to refer to a binder with at least some plastic characteristics, such as high plasticity index.
  • a clay binder may be ground or milled with IBA, in Step 105, to break up clumps, if necessary.
  • the IBA may comprise from about 5% to about 75% by dry weight of the mixture ("BDWM")
  • the PFA may comprise from about 90% to about 5% BDWM
  • the clay binder may comprise from about 5% to about 20% BDWM, for example.
  • the IBA comprises from about 30% to about 70% BDWM
  • the PFA comprises from about 60% to about 10% BDWM
  • the clay binder comprises from about 10% to about 20% BDWM.
  • the IBA comprises from about 30% to about 50% BDWM
  • the PFA comprises from about 60% to about 35% BDWM
  • the clay binder comprises from about 10% to about 15% BDWM.
  • the IBA comprises about 40% BDWM
  • the PFA comprises about 50% BDWM
  • the clay binder comprises about 10% BDWM.
  • the actual amount of clay binder added may depend on the amount of the IBA and PFA used. If higher amounts of IBA are used in the IBA/PFA mixture, then the amount of clay binder added is preferably at the upper end of the ranges , above. For example, if 70% IBA BDWM is used, then, preferably, the clay binder comprises 20% BDWM and the rest is PFA.
  • the clay binder may comprise bentonite and/or kaolin, for example. Since the clays bentonite and kaolin have similar calcium and silica compositions as PFA, the amount of PFA may be reduced by about the same amount as the added clay binder, without appreciably affecting the pyroprocessing behavior of the mixture. For example, if 10% clay binder BDWM is to be included in the mixture, then the percentage of PFA in the mixture may be reduced by about 10%, with little or no affect on the pyropiocessing behavior. While the amount of IBA may be reduced as well as or instead of reducing the amount of PFA to accommodate the clay binder, reducing the IBA may change the behavior of the mixture during pyroprocessing.
  • Water is then added to the mixture to achieve a clay-like consistency, which facilitates agglomeration, which is discussed in Step 145, below.
  • the amount of water to be added is related to the amount of PFA in the mixture. If more PFA is used, more water is required. For example, if the proportion of IBA to PFA is about 60% IBA to 40% PFA, the amount of water required is about 30% by weight of the total dry weight of the IBA/PFA mixture. If the proportion is 40%/60% IBA/PFA, it has been found that about 33% of the total dry weight of the IBA/PFA mixture of water should be added.
  • the amount of water required is about 38% of the total dry weight of the IBA/PFA mixture.
  • the effluent removed from the milled slurry in Step 125 may be used here. Less water may be used if a clay binder is also included.
  • the resulting mixture is agglomerated, in Step 150.
  • Agglomeration is a particle size enlargement technique hi which small, fine particles, such as dusts or powders, are gathered into larger masses, such as pellets.
  • the mixture is agglomerated by pelletization, wherein fine particles dispersed in either gas or liquid are enlarged by tumbling, without other external compacting forces.
  • a pelletizing rotating drum or disc may be used, for example.
  • the strength of the resulting pellets depends on the properties of the particles, the amount of moisture in the medium, and mechanical process parameters, such as the speed of rotation and angle of tilt of the rotating drum, as is known in the art.
  • An example of the use of a rotating drum is described in the examples, below.
  • the resulting pellets are nearly spherical or slightly angular, and vary in color from light to dark brown depending on the carbon and iron content in the mixes, hi one example they range in size from about 3 mm to about 40 mm.
  • Fig. 2 is an example of a pellet 10.
  • Extrusion may also be used instead of pelletization. Extrusion results in a brick-like material that can be crushed into smaller particles after hardening. Alternatively, compaction may be used to produce cylindrical agglomerates, such as tablets or other shapes.
  • the agglomerated mixture is optionally surface coated and then dried, in
  • the pellets may be coated with an inorganic material that will not melt at the sintering temperature.
  • the inorganic material may comprise low loss on ignition ("LOI") PFA or clay in the form of a dust, for example. Covering the pellet surface with a thin layer of non-sticking material results in formation of a skin on the pellet surface that decreases clustering of the pellets, enhances the pellet strength, and creates a thin dense outer skin 26 on the aggregate 20, as shown in Fig. 3, for example.
  • the amount of inorganic material added may be small.
  • the pellets may be coated by sprinkling the dust on them or rolling the pellets in the dust, for example.
  • coating is not needed to enhance pellet integrity or to form a coating, since the binder provides improved internal bonding. Coating is still an option, however. Drying may take place at about 11O 0 C in an oven, for example. Drying is preferably provided because sintering wet pellets in a kiln may result in cracking and exploding of the pellets due to rapid temperature changes.
  • the coated and dried pellets are pyroprocessed, in Step 160.
  • Pyroprocessing may take place at a temperature of from about 1,000 0 C to about 1,300 0 C, for example, depending on the composition of the mixture and the desired properties of the aggregate, as discussed in more detail, below.
  • the pyroprocessing may be sintering, which takes place at a temperature below the temperature of maximum densification, or vitrification, which takes place at or above the temperature of maximum densification.
  • the pyroprocessing preferably takes place in a rotary kiln. Sintering results in increased strength and density of formerly loosely bound particles, through the formation of interparticle bonds, as discussed above. Vitrification results in enen higher strength at the temperature of maximum densification. As vitrification progresses at higher temperatures, however, density and strength decrease due to bloating of the material, as discussed above.
  • the pyroprocessed pellets may be quenched in water, in Step 165. Quenching cools the pellets, stopping the melting. If quenched, the resulting aggregate will have a more amorphous matrix 24 than when air-cooled, which allows recrystallization. It is known in the art that quenching improves the hardness, toughness and wear resistance of the pyroprocessed aggregates.
  • the water may be at room temperature, (about 30 0 C), for example.
  • the effluent from the dewatering Step 125 may be used for quenching, if desired.
  • the aggregates may be crushed and graded to different sizes, in Step 170.
  • the pyroprocessed aggregates may range in size from about 2 mm to about 30 mm, for example.
  • Appropriate size ranges may be about 4 mm to about 8 mm, which may be used in filtration applications, and about 12 mm to about 19 mm, "which may be used in concrete, for example. Smaller aggregates (down to about 2 mm) may also be used as fine aggregates in concrete, for example.
  • Fig. 7 is an example of plurality of sintered aggregates 40% IBA and 60% PFA, pyroprocessed at 1,100 0 C-1, 120 0 C, made in accordance with embodiments of the invention.
  • the aggregates are chemically inert against most substances under normal environmental conditions, as demonstrated below.
  • Fig. 8 is another example of a process 200 for making aggregates in accordance with an embodiment of the invention, in which the PFA and optionally organic material are mixed with the raw IBA, so that both materials are subjected to wet milling together.
  • the milled mixtures therefore have finer particle size distributions than the milled powders produced by the process shown in Fig. 6, where the PFA is introduced to IBA after the IBA has been milled.
  • Step 205 the IBA, the PFA, and optionally the organic material are added to a barrel for milling.
  • the materials are wet milled, in Step 210.
  • Steps 215-235 correspond to Steps 115-135 of Fig. 6 and Steps 240-265 correspond to 145-170 in Fig. 6, respectively.
  • Steps 125 and 225 respectively.
  • the IBA powder produced by dry milling may be sieved through a 100 micron sieve and the resulting fraction may be oven dried. The dried fraction may then be processed in accordance with Steps 140-170 of Fig. 6 or Steps 240-265 of Fig. 8.
  • a clay binder may optionally be added in Step 205 or in Step 240. Preferably, the clay binder is added in Step 240.
  • the IBA Prior to receipt for processing into aggregates, the IBA is typically screened to separate large objects or strand-like materials. Ferrous metals are removed by electromagnets and non-ferrous metals are removed by eddy current separators, for example. The remaining materials are fractionated by size, which may be used for different purposes. The fraction less than about 8 mm was used in these Examples. A larger fraction could also be used, after crushing.
  • the average chemical analyses (major oxides) of the IBA and the PFA used in these experiments are shown in Table A, below.
  • the major crystalline phases in IBA were quartz (SiO 2 ), calcite (CaCO 3 ), and lower amounts of hematite (Fe 2 O 3 ).
  • the major crystalline phases were quartz (SiO 2 ) and mullite (Al 6 Si 2 Oi 3 ).
  • Table C shows the chemical composition of one example of a sintered LWA in accordance with an embodiment.
  • the low calcium content ( ⁇ 2%) and high silica, alumina, and ferric oxide content indicate that the PFA was Class F PFA.
  • the fraction less than 355 microns was de- watered by pressure filtration in a stainless steel extraction vessel using Whatman GF/C filter paper, forming filter cakes.
  • the filter cakes were oven-dried overnight at 110°C and ground with a mortar and pestle to produce a fine, homogeneous powder.
  • the ground powder mixes of IBA and PFA were mixed with water (up to about 45% by total dry weight of the resulting mixture) in a batch mixer and then fed to a rotary drum pelletizer having a 40 cm diameter and a 1 meter length rotating at about 17 rpm at an angle of 30° to the horizontal.
  • the resulting "green" pellets were generally spherical or slightly angular.
  • the pellets had a diameter of from about 4 mm to about 19 mm (for ASTM mesh size).
  • the pellets less than 4 mm were returned to the drum for pelletizing, while the pellets greater than 19 mm were broken down into smaller pellets by hand and returned to the pelletizer.
  • the pellets were then coated with PFA powder, by sprinkling the PFA powder onto them.
  • the pellets were then dried at about HO 0 C and fed to a rotary kiln having a 77 mm internal diameter by 1500 mm length, in which the heated zone was 900 mm long.
  • the kiln was set to run at temperatures between about 1,080 0 C and about 1,220 0 C for the different IBA with PFA mixes.
  • the pellets traveled and rotated along a tube of the rotary kiln, at a speed of about 2.8 rpm for about 10 minutes to about 12 minutes.
  • the kiln was an electric fired rotary furnace available from Carbolite Hope Valley, England, Model No. GTF Rl 95.
  • the sintered product was discharged from the kiln and was allowed to cool at room temperature. It is noted that the temperature versus density curves may vary in each kiln. For example, the curves corresponding to particular proportions of IBA and PFA may have the maximum densiflcation temperature at slightly lower or higher temperatures than those using the specific kiln identified above.
  • This curve shifting may be attributed to the operational efficiency of a particular kiln, such as the stability of temperature profile, energy losses, etc. It may therefore be necessary to prepare a general samples in a particular kiln being used to identify the temperature range over which the aggregate will have the desired characteristics.
  • Tables E-F summarize the physical and mechanical properties of aggregates formed by the process of Example 1. It is noted that the aggregates showed substantial changes in their physical properties with increasing concentrations of PFA in the IBA/PFA mixes.
  • Table E shows the effect of the addition of PFA on density and water absorption capacities of aggregates comprising different proportions of IBA to PFA, pyroprocessed at different temperature ranges (in 10 centigrade degree increments).
  • the relative dry densities of the pyroprocessed aggregates were calculated using Archimedes' method and the water absoiptions were determined from the increase in weight of "surface dry" aggregates after being submerged for 24 hours.
  • High water absorption values indicate that the structure is porous and open to the absorption of water due to microscopic surface pores that connect to internal pores in the aggregate, discussed above.
  • the data presented is an average of 7 values for the 100% IBA and an average of 2 values for all samples containing PFA.
  • the density versus temperature data is plotted on the graph of Fig. 1.
  • increasing the PFA concentration in the mixes resulted in a broader temperature interval between the initial softening, sintering, maximum densification (vitrification), and complete or near complete melting of the samples, due to the modification of the chemical composition and mineralogy of the IBA with increasing amounts of PFA.
  • temperature may be used to determine the density and other characteristics of the sintered product, for a given combination of IBA and PFA.
  • sintering at 1,100 0 C will yield a LWA with a density of about 1.50 g/cm 3
  • sintering the same mixture at 1,190 0 C will yield a normal weight aggregate with a density of about 2.4 g/cm .
  • Table E also shows the effect of PFA addition on the water absorption capacities of the different aggregates. Aggregates produced at lower temperatures than the temperature of maximum densification typically have open, porous microstructures. As maximum densification is approached, the size and number of the pores gradually decrease to zero, as the pores are filled with melted material. Samples containing high amounts of IBA exhibit a rapid reduction in water absoiption with temperature, while high PFA samples show a gradual water absorption reduction with temperature.
  • 100% PFA samples are relatively non-porous ( ⁇ 5% water absorption) between 1,080 0 C and 1,100 0 C due to the high densities attained, while 100%/0%, 80%/20%, 60%/40% and 40%/60% IBA/PFA mixes have 30% to 40% water absorptions at 1,080 0 C.
  • 2.0 g/cm 3 (down to about 1.4 g/cm 3 ) can be made in accordance with embodiments of the invention, for use in lightweight concrete. Aggregates with relative densities above 2.0 g/cm 3 , up to about 2.5 g/cm 3 , that are impermeable to water ingress, with high strengths, can be made for use as replacement aggregates in conventional (normal weight) concrete.
  • Table F summarizes aggregate crushing values ("ACVs") (%) for selected mixes of IBA and PFA, at specific pyroprocessing temperatures.
  • the ACVs are provided at three different temperatures for different proportions of IBA to PFA.
  • ACV is inversely proportional to aggregate strength.
  • the selected temperatures were those causing different product characteristics and different microstructures, for comparison.
  • a sintered LWA was produced in accordance with a preferred embodiment of the invention.
  • a well-sintered or vitrified, normal weight aggregate with small amounts of residual pores was produced in accordance with embodiments of the present invention.
  • vitrified LWA was produced, also in accordance with embodiments of the invention.
  • the higher temperatures caused the aggregate to be a LWA, due to expansion and melting of the materials, as discussed above.
  • ACVs were lower and the strength of the aggregates were higher at the temperature of maximum densification (middle temperature). Below that temperature, the densities were lower, the ACVs were higher, and the strengths of individual or bulk aggregates were lower. Above that temperature, the ACVs started to increase as the density and aggregate strength decreased, as a result of increased sample melting.
  • the aggregate strengths show the same trend of pellet densities with increasing temperature, increasing to a maximum value and then decreasing, as expected.
  • the LWAs comprising IBA and PFA in varying proportions in accordance with embodiments of the invention also have lower ACVs and higher strengths than LYTAG, which has an ACV of about 34%, as noted below. TABLE F: AGGREGATE CRUSHING VALUE (%)
  • Table G summarizes certain physical properties (relative dry densities and water absorption from Table E and bulk densities) and mechanical properties (ACV from Table F and hardness) of aggregates from 100%/0%, 40%/60% and 0%/100% mixes of IBA/PFA at three selected temperatures. Hardness was measured by using the diamond pyramid Vickers test on aggregates embedded in epoxy resin and polished using a 0.5 micron paste, as is known in the art. Hardness is highest for aggregates sintered at the middle temperatures of maximum densification, reaching values between 2 to 4 GPa. The highest value of 3.6 was obtained for the 40%/60% mix of IBA/PFA at 1,190 0 C. TABLE G: PHYSICAL AND MECHANICAL PROPERTIES OF AGGREGATES
  • LWA-I The physical and mechanical properties of LWAs produced from a 40%/60% mix of IBA/PFA, sintered at 1,120 0 C, were determined and summarized in Table H, below (where the LWAs are referred to as LWA-I), along with the corresponding properties of the commercially available LYTAG (PFA) and OPTIROC (clay) aggregates.
  • the individual pellet properties are averages of 100 measurements and the bulk pellet properties are averages of 6 measurements.
  • a comparison of the properties of LYTAG and the sintered LWA-I shows that both aggregates had comparable individual and bulk aggregate densities (relative density around 1.5 g/cm 3 , loose bulk density between 0.8 and 0.9 g/cm 3 ). While sintered LWA-I had higher water absorption capacity than LYTAG, both aggregates showed similar porosities, indicating the more open, water-accessible pore structure of sintered LWA-I in comparison to LYTAG. The ACV of LWA-I were significantly less than that of LYTAG, which shows that LWA-I can resist higher stresses as a bulk when loaded in compression.
  • LWA-I can produce concretes with similar strength, density, and other properties, to LYTAG concretes.
  • OPTIROC has a very low density, relatively low water absorption, and very low strength. This is to be expected since OPTIROC has a honeycombed microstrucrure having a high volume of isolated spherical porosity.
  • the desired consistency and subsequent compaction of concrete was readily achieved with the three aggregates.
  • the density of the fresh and hardened concrete was measured for the three aggregates and summarized in Table J, below.
  • the average compressive strengths of hardened concrete including the three aggregates were determined at the ages of 3, 7, 14, 28, and 56 days and are provided in Table K, below.
  • the data comprises averages of 6 concrete cubes cast for each aggregate at the different ages.
  • the compressive strength of concrete from sintered LWA-I at 7, 14, 28 and 56 days was 43.7 MPa, 50.7 MPa, 56.2 MPa, and 61.4 MPa, which classifies it as high strength concrete.
  • Comparable compressive strengths were obtained for concrete made with LYTAG.
  • the very low strengths of concrete made with OPTIROC lightweight aggregates are attributed to the very low strengths, low densities, and high porosities of OPTIROC aggregates. Concrete made from sintered lightweight aggregates having lower water absorption capacities and similar (or higher) densities to the aggregates used in this Example may achieve even higher compressive strengths than those reported here.
  • a range of concretes with compressive strengths at least comparable to concrete including LYTAG may be obtained based on the selection of the required aggregate properties for the intended application. Leaching Tests
  • LWA-I was found to be chemically inert under normal environmental conditions for applications where undesirable leaching may contaminate ground or underground water supplies, for example.
  • the leaching of selected heavy metals was tested in accordance with the Acid Neutralization Capacity (ANC) test from lightweight sintered aggregates comprising 40%/60% IBA/PFA fired at 1,12O 0 C.
  • ANC Acid Neutralization Capacity
  • LYTAG and OPTIROC were also tested. It was found that leaching under alkaline and neutral conditions was insignificant. There was only slight leaching of certain metals under highly acidic conditions ( ⁇ H ⁇ 3).
  • LWA-I showed very low magnesium leaching for pH>3, as shown in Fig. 9a. LWA-I was found to be the most resistant aggregate to magnesium leaching under all pH conditions. [0090] LWA-I was found to be inert to iron (Fe) leaching for leachate pH values above 2, as shown in Fig. 9b. This is possibly due to entrapment of iron inside the matrix during the reduction of iron compounds induced by rapid sintering. There was no detectable iron leaching from LYTAG and OPTIROC under alkaline conditions.
  • iron leaching from LYTAG increased substantially with increasing acid additions to values between 6,000 to 8,000 mg/kg for pH ⁇ 2.
  • the iron availability from LYTAG aggregate is believed to be due to destruction of iron oxides and hydroxides during sintering of PFA.
  • OPTIROC aggregate showed very low copper leaching at all pH conditions.
  • the sintered LWA-I showed similar leaching behavior to OPTIROC for most metals; however it showed significantly lower leachability for magnesium (Mg).
  • Example 2 The same processing methodology used with Example 1 (the process of Fig. 8) was used for mixes of IBA with PFA and an. organic material, which in this example was activated carbon waste (ACW), to increase porosity, yielding lower weight, lower density aggregates.
  • the composition of the IBA and the PFA used in Example 2 is the same as that used in Example 1.
  • the same equipment used in Example 1 is used here.
  • Table L shows the particle size distribution data of as-received ACW.
  • the material had a mean particle size diameter of 95.31 microns.
  • the ACW showed a wide particle size distribution, with 95% of its volume ( ⁇ s value) comprising particles finer than 347 microns.
  • the particle size distribution decreased with milling for both raw IBA and PFA, as shown in Fig. 10.
  • the milled powder mixes of IBA, PFA, and ACW were mixed with increasing amounts of water for increasing ACW concentrations until the consistency of the mix allowed pelletization.
  • the optimum amount of water added varied between about 35% to about 65% for carbon contents between about 1% to about 30% by weight of the IBA/PFA mix.
  • the mix was fed to a revolving drum and the pellets collected at the end of the drum were sieved through 4 and 11.2 mm sieves (ASTM).
  • the pellets were coated with PFA powder, as described above, and were then dried in an oven at about 110 0 C, overnight.
  • the resulting green pellets were then sintered in a rotary kiln at temperatures between 1,080 0 C and 1,200 0 C, for about 10 to about 12 minutes.
  • the 40%/60% IBA/PFA mix is, therefore, the preferred combination among those studied for effective incorporation of an organic material to introduce pores in the sintered pellets.
  • Sintered pellets comprising 40%/60% IBA/PFA mixes at 1,100 0 C and the addition of ACW of 10% or more, achieved densities lower than 1.3 g/cm 3 .
  • Such aggregates are suitable for use in structural concrete, where lightweight aggregates are required.
  • LWA-2 had a relative density of 1.3 g/cm 3 , loose bulk density of 0.8 g/cm 3 , and
  • LWA-2 had high water absorption due to carbon decomposition during firing, which is also responsible for the reduced strength.
  • LWA-2 The ANC test was conducted on LWA-2 in order to examine their leachability under different pH environments. As with LWA-I, discussed above, LWA-2 was found to be chemically inert under normal environmental conditions and had lower leaching concentrations of heavy metals compared to LWA-I and the commercial aggregate.
  • LWA-2 showed lower copper (Cu) release than LYTAG for all pHs above 3.
  • LWA-2 showed very low nickel (Ni) concentrations under all pHs and substantially lower than LYTAG.
  • LWA-2 is a high-value, consistent lightweight aggregate, from which there is no detectable leachable fraction of heavy metals for leachate pH values of 3. While rapid release of heavy metals was observed at leachate pH values lower than 3, aggregates are not normally exposed at such low pHs, and the leaching concentrations were very still low in comparison with the total heavy metal concentrations present and the heavy metal release of the commercial aggregates LYTAG and OPTIROC. [0123]
  • the embodiments described herein are examples of implementations of the invention. Modifications may be made to these examples without departing irom the spirit and scope of the invention, which is defined by the claims, below.

Abstract

La présente invention concerne un procédé pour produire un agrégat qui consiste à mélanger des cendres de fond d'incinérateur (« IBA ») provenant d'un incinérateur municipal de déchets solides et des cendres volantes (« PFA ») provenant d'une combustion de charbon. Le procédé consiste également à agglomérer le mélange, par exemple dans le cadre d'une pelletisation, et à pyrotraiter les agglomérats, par exemple dans le cadre d'un frittage ou d'une vitrification, afin de former lesdits agrégats. L'ajout des cendres volantes aux cendres de fond d'incinérateur s'avère faciliter la production d'agrégats de poids léger et de poids normal. Les cendres de fond d'incinérateur ou le mélange de cendres de fond d'incinérateur et de cendres volantes sont de préférence soumis à un concassage humide avant l'agglomération. Il est préférable que la proportion de cendres de fond d'incinérateur par rapport aux cendres volantes s'élève à 40 %/60 %. Les agglomérats peuvent être revêtus avec une matière inorganique, afin de créer une couche de surface sur l'agrégat. De la matière organique peut être intégrée dans le mélange, afin d'augmenter la porosité des agrégats. Un liant plastique, tel que de l'argile, peut également être ajouté au mélange. Cette invention concerne également un agrégat fritté de poids léger comprenant des cendres de fond d'incinérateur et des cendres volantes, ainsi qu'un agrégat comprenant des cendres de fond d'incinérateur et des cendres volantes.
PCT/EP2006/000270 2005-01-14 2006-01-13 Agregats pyrotraites comprenant des cendres de fond d'incinerateur et des cendres volantes et procedes pour produire de tels agregats WO2006074944A1 (fr)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7655088B2 (en) 2005-01-14 2010-02-02 Alkemy, Ltd. Synthetic aggregates comprising sewage sludge and other waste materials and methods for producing such aggregates
US7704317B2 (en) * 2005-01-14 2010-04-27 Alkemy, Ltd. Pyroprocessed aggregates comprising IBA and PFA and methods for producing such aggregates
US7780781B2 (en) * 2005-01-14 2010-08-24 Alkemy, Ltd. Pyroprocessed aggregates comprising IBA and low calcium silicoaluminous materials and methods for producing such aggregates
CN106045243A (zh) * 2016-05-31 2016-10-26 武汉钢铁股份有限公司 一种冶金水站污泥改性剂及制造方法
CN106244798A (zh) * 2016-08-22 2016-12-21 山东钢铁股份有限公司 一种利用烧结工艺处理焦化废水的方法
LT6689B (lt) 2019-05-13 2020-01-10 VšĮ Vilniaus Gedimino technikos universitetas Keraminių gaminių su šlako (dugno pelenų) priedu gavimo būdas
CN112159238A (zh) * 2020-09-15 2021-01-01 江苏大丰新安德矿业有限公司 一种磁化焙烧选铁尾矿陶粒及其制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4049984A1 (fr) 2021-02-24 2022-08-31 Vilniaus Gedimino technikos universitetas Liant hydraulique pour routes avec cendres résiduelles mswi et son procédé de production

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6317791B2 (fr) * 1980-08-04 1988-04-15 Tokyo Denryoku Kk
WO1997009283A1 (fr) * 1995-09-08 1997-03-13 Strabala William M Composites de cendres volantes et procedes de fabrication associes
JPH1029841A (ja) * 1996-07-16 1998-02-03 Sumitomo Metal Mining Co Ltd 人工骨材の製造方法
KR20030061177A (ko) * 2002-01-11 2003-07-18 조병완 석탄회를 이용한 인공골재, 그 생산방법 및 이를 이용한프리캐스트 콘크리트 또는 시멘트 제품
WO2003059820A1 (fr) * 2002-01-15 2003-07-24 Eac Operations, Inc. Ceramique technique elaboree a base de cendres combinees d'un incinerateur municipal de dechets

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6317791B2 (fr) * 1980-08-04 1988-04-15 Tokyo Denryoku Kk
WO1997009283A1 (fr) * 1995-09-08 1997-03-13 Strabala William M Composites de cendres volantes et procedes de fabrication associes
JPH1029841A (ja) * 1996-07-16 1998-02-03 Sumitomo Metal Mining Co Ltd 人工骨材の製造方法
KR20030061177A (ko) * 2002-01-11 2003-07-18 조병완 석탄회를 이용한 인공골재, 그 생산방법 및 이를 이용한프리캐스트 콘크리트 또는 시멘트 제품
WO2003059820A1 (fr) * 2002-01-15 2003-07-24 Eac Operations, Inc. Ceramique technique elaboree a base de cendres combinees d'un incinerateur municipal de dechets

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
BETHANIS S ET AL: "Production of lightweight aggregate from incinerator bottom ash and pulverised fuel ash", WASTE MANAG. ENVIRON.; WASTE MANAGEMENT AND THE ENVIRONMENT II; WASTE MANAGEMENT AND THE ENVIRONMENT II 2004, 2004, pages 55 - 64, XP008053699 *
DATABASE WPI Section Ch Week 198819, Derwent World Patents Index; Class L02, AN 1982-27042E, XP002348463 *
DATABASE WPI Section Ch Week 200381, Derwent World Patents Index; Class L02, AN 2003-873723, XP002348464 *
DE CASA G ET AL: "Production of artificial aggregates from ceramic processing of municipal incinerator fly ash", WASTE MANAG. ENVIRON.; WASTE MANAGEMENT AND THE ENVIRONMENT II; WASTE MANAGEMENT AND THE ENVIRONMENT II 2004, 2004, pages 45 - 54, XP008062747 *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 06 30 April 1998 (1998-04-30) *

Cited By (9)

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US7655088B2 (en) 2005-01-14 2010-02-02 Alkemy, Ltd. Synthetic aggregates comprising sewage sludge and other waste materials and methods for producing such aggregates
US7704317B2 (en) * 2005-01-14 2010-04-27 Alkemy, Ltd. Pyroprocessed aggregates comprising IBA and PFA and methods for producing such aggregates
US7780781B2 (en) * 2005-01-14 2010-08-24 Alkemy, Ltd. Pyroprocessed aggregates comprising IBA and low calcium silicoaluminous materials and methods for producing such aggregates
US8206504B2 (en) 2005-01-14 2012-06-26 Alkemy, Ltd. Synthetic aggregates comprising sewage sludge and other waste materials and methods for producing such aggregates
US8349070B2 (en) * 2005-01-14 2013-01-08 Alkemy, Ltd. Pyroprocessed aggregates comprising IBA and low calcium silicoaluminous materials and methods for producing such aggregates
CN106045243A (zh) * 2016-05-31 2016-10-26 武汉钢铁股份有限公司 一种冶金水站污泥改性剂及制造方法
CN106244798A (zh) * 2016-08-22 2016-12-21 山东钢铁股份有限公司 一种利用烧结工艺处理焦化废水的方法
LT6689B (lt) 2019-05-13 2020-01-10 VšĮ Vilniaus Gedimino technikos universitetas Keraminių gaminių su šlako (dugno pelenų) priedu gavimo būdas
CN112159238A (zh) * 2020-09-15 2021-01-01 江苏大丰新安德矿业有限公司 一种磁化焙烧选铁尾矿陶粒及其制备方法

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