CN1218014A - Artificial lightweight aggregate manufacturing method therefor - Google Patents
Artificial lightweight aggregate manufacturing method therefor Download PDFInfo
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- CN1218014A CN1218014A CN98124331A CN98124331A CN1218014A CN 1218014 A CN1218014 A CN 1218014A CN 98124331 A CN98124331 A CN 98124331A CN 98124331 A CN98124331 A CN 98124331A CN 1218014 A CN1218014 A CN 1218014A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/002—Use of waste materials, e.g. slags
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B18/023—Fired or melted materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
Fly ash is mixed with a melting point lowering agent, a caking agent comprising bentonite, and with either a foaming agent comprising iron oxide, silicon carbide and carbonaceous material, or a material for adjusting the degree of reduction comprising carbonaceous material. The mixture is crushed so that the average particle size is up to 15 microns which is pelletized after which the pellets are baked within a temperature range of 1000 DEG C - 1250 DEG C. As a result, a lightweight aggregate having bone dry specific gravity of 1.5-0.5 in is obtained.
Description
After the present invention relates to a kind of will the recovery by the coal firing boiler of coal-fired power plant and the flyash that produces like that, as the artificial lightweight aggregate that uses in buildings and the public work, thereby effectively utilize the method for this flyash, also relate to the artificial lightweight aggregate of making by aforesaid method.
Effectively utilize coal firing boiler and the flyash that produces like that to be still a bigger difficult problem at present by coal-fired power plant.
Handling this respect at loose material, effectively utilize flyash, is fit closely used as the artificial lightweight aggregate of a large amount of needs.
Yet, will cross sieve method by sintering by the flyash that coal firing boiler produced of coal-fired power plant, the part composition is formed gathers materials, thereby with flyash as gathering materials, be still very restricted so far.
Its reason is, for the coal firing boiler of coal-fired power plant and like that, is bonded on boi1er tube or the boiler wall in order to reduce flyash, selects and used the coal that can produce high-melting-point flyash.That is, normally dystectic by the coal firing boiler and the flyash that produces like that of coal-fired power plant, in order to generate light aggregate, just this flyash must be mixed with a large amount of low-melting clays or shale and roasting by this flyash.It is very difficult obtaining a large amount of this clays and shale.And this clay of exploitation, transportation, pre-treatment and mixing and shale need bigger cost.Therefore, increased the manufacturing cost of artificial lightweight aggregate.And because the utilization of fly ash rate of per unit goods is low, so, from effectively utilizing the flyash this respect, this utilization is unfavorable.Particularly, utilizing the adiabatic drying proportion of the artificial lightweight aggregate of flyash manufacturing to be about 1.2～1.4, is that the technology of 1.0～05 light artificial lightweight aggregate does not exist and make adiabatic drying proportion.Therefore, this utilization is limited.
An object of the present invention is to provide a technology, it so that at a lower temperature, makes a kind of high specific strength, high-quality artificial lightweight aggregate at lower cost by adding a kind of additive cheaply that is easy to obtain.
And then, an object of the present invention is usage quantity, thereby increase per unit goods utilization of coal ash rate by the minimizing additive, increased utilization of coal ash efficient like this.
Have again, an object of the present invention is to increase its lightweight degree, thereby a kind of extremely light artificial lightweight aggregate is provided, thereby expand its purposes.
The flyash that is produced by coal firing boiler is mixed to obtain a kind of mixture with a kind of reduction fusing point agent, a kind of agglutinant and a kind of whipping agent, pulverize this mixture, median size is 15 microns at the most like this, therefore obtain a kind of powder, add water and carry out granulation to this powder to obtain particle, then in a rotary kiln, roasting in 1000 ℃ to 1250 ℃ temperature range is made artificial lightweight aggregate of the present invention to obtain 1.0～0.5 adiabatic drying proportion particulate step.And, the method of manufacture of intraocular light aggregate of the present invention comprises: make the flyash that produced by coal firing boiler and a kind of fusing point agent, a kind of agglutinant and a kind of whipping agent or a kind of material mixing of reducing degree of regulating of reducing to obtain a kind of mixture, pulverize this mixture, like this median size at the most 15 microns to obtain a kind of powder, add water and carry out granulation to this powder to obtain particle, then in a rotary kiln, in 1000 ℃ to 1250 ℃ temperature range, roasting particle.Here, before roasting, can carry out drying.
Whipping agent comprises ferric oxide, and this iron oxide content makes Fe in the flyash
2O
3Content range account for 1%～10% by weight percentage, comprise that also content range accounts for 0%～1% the silicon carbide that 0.2%～10% carbonaceous material of flyash and content range account for flyash by weight percentage by weight percentage.Particularly, roasting with the situation that obtains 1.0～0.5 adiabatic drying proportion under, preferably add ferric oxide, this iron oxide content makes Fe in the flyash
2O
3Content range account for 3%～10% by weight percentage, content range accounts for 0.2%～10% the carbonaceous material that 0.1%～1% silicon carbide of flyash and content range account for flyash by weight percentage by weight percentage.Typical carbonaceous material is coal or coke.
By a kind of alkali metal compound is mixed with flyash, make Na
2O and K
2The total amount of O is by weight percentage respectively or all in 30%～50% scope, 1000 ℃～1200 ℃ temperature range internal heating and the fusing this mixture to form a kind of glassy mass, cooling and broken above-mentioned glassy mass reduce the fusing point agent thereby make then.
Then, reduce the fusing point agent and preferably add in the flyash, make Na
2O and K
2Total weight range of O accounts for 2%～6% of baked article by weight percentage.At this, alkali metal compound is yellow soda ash or salt of wormwood preferably.
It is to be used for regulating the inner reducing degree that gathers materials that reducing degree is regulated material, and it is preferably made by 0.2%～10% the carbonaceous material that content range accounts for flyash by weight percentage.Typical carbonaceous material is coal or coke.
The present invention's substance in flyash reduces the fusing point agent to make, and promptly by a kind of alkali metal compound is mixed with flyash, makes Na
2O and K
2The total amount of O and heats in 1000 ℃～1200 ℃ temperature range and melt by weight percentage respectively or all in 30%～50% scope, to form a kind of glassy mass, cools off then and fragmentation, thereby makes this goods.Like this, the Na of conversion
2O and K
2Total weight range of O accounts for 2%～6% of baked article by weight percentage.As a result, the fine coal fusion point of ash is reduced in 1000 ℃～1200 ℃ the temperature range, and industrial in this temperature is that reasonably the roasting ratio is easier to.Then, add carbonaceous material for example coal or the coke that ferric oxide, silicon carbide and median size as whipping agent is equal to or less than 10 microns.Therefore, but a kind of first artificial lightweight aggregate of roasting, and this first artificial lightweight aggregate has the adiabatic drying proportion of high specific strength and low water absorption and about 0.5～1.5.
Perhaps, add median size 10 microns carbonaceous material for example coal or the coke at the most of regulating material as reducing degree, the content that this reducing degree is regulated material accounts for 0.2%～10% of flyash by weight percentage, therefore, but a kind of second artificial lightweight aggregate of roasting, this second artificial lightweight aggregate has the adiabatic drying proportion of high specific strength and low water absorption and about 1.5～2.0.
In flyash, add ferric oxide, like this, Fe in flyash
2O
3Content range account for 1%～10% by weight percentage.Particularly, adiabatic drying proportion be 0.5～1.0 situation under, Fe
2O
3Content is by weight percentage at least 3%, and the carborundum content that adds in the flyash accounts for 0.1%～1% by weight percentage.And the content of the carbonaceous material of use accounts for 0.2%～10% of flyash by weight percentage.Reduction situation when here, carbonaceous material also is used for regulating roasting in the granular particle.
For a specific working example, yellow soda ash, salt of wormwood and flyash are mixed, in 1000 ℃～1200 ℃ temperature range, heat then and melt, to form a kind of glassy mass, wherein Na
2O and K
2The total amount of O by weight percentage respectively or all in 30%～50% scope, cooling and broken then, thus make reduction fusing point agent.
According to the method for a kind of manufacture of intraocular light aggregate of the present invention, at first, with respect to the raw-material flyash of conduct that is 100 parts by weight, in additional ratio, add 0.2～5 part of wilkinite, and add aforementioned reduction fusing point agent as agglutinant, like this, the Na that changes into
2O and K
2Total weight range of O accounts for 2%～6% of baked article by weight percentage.
And, under the situation that produces first artificial lightweight aggregate, add whipping agent with aforementioned ratio.Perhaps, producing under the situation of second artificial lightweight aggregate, adding accounting for 0.2%～10% carbonaceous material for example coal or coke by weight percentage, so that regulate the inner reducing degree that gathers materials.
Then, the mixture that obtains is by this way pulverized to reach 15 microns at the most of median sizes.Then, granulation obtains particle by interpolation water and to powder.Thereafter, in case of necessity after drying, at 1000 ℃～1250 ℃ roasting particles.
The prilling process of Shi Yonging can be to utilize a kind of pan pelletizer or a kind ofly push the particle that nodulizer can simply obtain a kind of predetermined diameter in the present invention.And, for roasting,, preferably use a kind of rotary kiln if wish successive operation and uniform quality.
Discuss below and reduce the fusing point agent.
For flyash, generally, the temperature when generating liquid phase with the beginning sintering is very high, reaches 1400 ℃～1500 ℃.Since the resistivity against fire of roasting apparatus, the difficulty of the selection aspect of energy charge and whipping agent, unrealistic at 1400 ℃～1500 ℃ roasting artificial lightweight aggregates.So far, under the raw-material situation of this high resistivity against fire of roasting, a kind of method is arranged usually, promptly heavy addition is as the natural mineral that reduces the fusing point agent, for example low resistivity against fire and comprise a large amount of basic metal or the cullet for example clay or the shale of vial etc.The present invention confirms that to the investigation result of the effect of the clay that adds and shale in the composition that forms these clays and shale, the temperature with a spot of alkali-metal formation liquid phase is significantly low.
Yet, comprise a large amount of alkali-metal technical chemistry products if in flyash, add, have only the particle surface fusing of granulated powder coal ash, and can not roasting arrive its inside.This is that in drying granular particulate step, basic metal concentrates on particle surface because it mainly is water-soluble part that conduct can effectively reduce the sodium salt and the sylvite of the alkali-metal mechanicals of fusing point, therefore, when roasting, have only the particle surface fusing, and can not its inside of roasting.
From for preventing that the investigation result that the industrial soda metallic compound concentrates on the method for particle surface from can find, when for example yellow soda ash or salt of wormwood mix with flyash with a kind of alkali metal compound, and in 1000 ℃～1200 ℃ temperature range, heat and melt, to form a kind of glassy mass, make Na
2O and K
2The total amount of O is cooled off then and is pulverized by weight percentage respectively or all in 30%～50% scope, and adds in the flyash, makes Na
2O and K
2Total weight range of O accounts for 2%～6% of baked article by weight percentage, then, 1000 ℃～1250 ℃ temperature roasting, at this moment, obtains the high strength artificial lightweight aggregate of a kind of center even foaming.
For the present invention, the alkali metal compound that is used to reduce the fusing point agent for example yellow soda ash or salt of wormwood with low cost as technical chemistry product mass production, therefore, the present invention is favourable aspect cost.And, when carbonate that heats basic metal family or supercarbonate, do not produce obnoxious flavour, be ideal like this.Add alkali metal compound by giving in the flyash, make by basic metal and silicon-dioxide and be difficult to water-soluble a kind of glassy mass, because flyash is as the source of the silicon-dioxide of making glassy mass.So, flyash can also be used to reduce the fusing point agent.Therefore, the processing rate of flyash can improve, and does not need new source, so this is an ideal very.
For reducing fusing point agent, Na
2O or K
2The total amount of O by weight percentage respectively or all 30% or below, the melting temperature that generates glass is above 1200 ℃.Therefore, it is big that equipment and upkeep cost become, and energy charge is also high.And, because the alkali-metal per-cent that comprises also descends, reduce the big of fusing point agent, so this is undesirable with quantitative change.And, if Na
2O or K
2The total amount of O is distinguished by weight percentage or all above 50%, so, the water-soluble increase of the glassy mass of formation therefore have only the surface of granular particle to be easy to deliquescing, and granule interior can not roasting.Therefore, this is undesirable.
For artificial lightweight aggregate of the present invention, why add and a kind ofly reduce the fusing point agent so that the Na that transforms
2O and K
2Total weight range of O accounts for 2%～6% of baked article by weight percentage, is because of the kind according to carbonaceous material, the chemical ingredients difference of flyash, and by weight percentage, it comprises: SiO
250%～55%, Al
2O
325%～30%, Na
2O; 0.2%～2%, K
2O; 0.2%～1%, and by adding basic metal family with aforementioned consumption, fusing point reduces greatly, and the temperature of fusion range extension.
If the Na in artificial lightweight aggregate
2O or K
2The total amount of O is by weight percentage less than 2%, and maturing temperature becomes 1250 ℃ or bigger, is unpractical like this.And if be increased to greater than 6%, the reduction effect of fusing point is minimum, thereby because the increase manufacturing expense of additive increases, this is undesirable.
The following describes the whipping agent that is used for obtaining first artificial lightweight aggregate.
When for granulation when flyash adds water, so, according to prilling process, the bulk specific gravity of dry granules almost becomes 1.5～1.9.When this particle during 1000 ℃～1250 ℃ roastings, adiabatic drying proportion becomes about 1.5～2.0.As a result, for the adiabatic drying proportion that makes artificial lightweight aggregate is about 0.5～1.5, in flyash, add a kind of whipping agent.
For the ferric oxide of whipping agent, highly oxidized rhombohedral iron ore is an ideal.The reason that makes the particle diameter of ferric oxide be equal to or less than 10 microns is to promote reduction reaction by carbonaceous material and silicon carbide during roasting.And, the manufacture of intraocular middle Fe that gathers materials during roasting
2O
3Content by weight percentage 1% or bigger reason be because if less than this, then the effect of whipping agent is minimum, and the adiabatic drying proportion of artificial lightweight aggregate can not reduce to about 1.0～1.5.And, be 0.5～1.0 in order to make adiabatic drying proportion, Fe
2O
3Content by weight percentage must be 3% or bigger, therefore, silicon carbide fully reacts.Because the foaming effect of the carbon that silicon carbide decomposition produces, lightweight clearly.On the other hand, even the Fe in baked gathering materials
2O
3Content surpass 10% by weight percentage because foaming and the lightweight effect can not increase.Here, the proportion of ferric oxide is much larger than the proportion of flyash, and if promote foaming, the adiabatic drying proportion of artificial lightweight aggregate can increase.
When producing liquid phase in a large number by the heating granular particle, silicon carbide and ferric oxide (Fe
2O
3) react and produce CO and CO with good effect
2Gas.This CO and CO
2Gas is caught and is promoted that rising of the interior bubble of particle is big.When the content of silicon carbide less than 0.1%, adiabatic drying proportion is that 0.5～1.0 lightweight effect is abundant inadequately, and can not reach adiabatic drying proportion and be equal to or less than 1.0.On the other hand, even surpass 10%, the lightweight effect can not increase.
For carbonaceous material, as described below, the effect of regulating the granule interior reducing degree during sintering is very strong, and it with the ferric oxide reaction with the acquisition foamable reaction.
Describe below in order to obtain a kind of material that second artificial lightweight aggregate is used for regulating reducing degree.
By the carbonaceous material that adds make the inside of granular particle keep a kind of reason of reducing atmosphere be for the ferric oxide that will comprise in the flyash be that rhombohedral iron ore is reduced into wustite or magnetite, reduce the fusing point of parent like this, make the particle surface oxidation, increase resistivity against fire so that when heating, slow down the particulate fusing, increase maturing temperature, and promote inner sintering to increase aggregate strength and to reduce water-intake rate.
By weight percentage 0.2% or littler carbonaceous material, granule interior reductive state can't keep for adding proportion, therefore can not obtain the effect that the granule interior fusing point reduces.And if the adding proportion of carbonaceous material surpasses 10%, so, unburned carbon remains on granule interior, and because a little less than the reaction of residue carbon and silicon-dioxide, the strength degradation of possible artificial lightweight aggregate, and water-intake rate increases.This is undesirable.
When for granulation water being added in the flyash, then according to prilling process, the bulk specific gravity of dried particles becomes about 1.5～1.9.As fruit granule 1000 ℃～1250 ℃ with a kind of material roasting of regulating reducing degree, obtain then a kind ofly to have high-strength the gathering materials that about 1.5～2.0 adiabatic drying proportion and some roastings are shunk.
The present invention will talk about following working example now.
Working example 1～65th, about first artificial lightweight aggregate, and working example 66～94th, about second artificial lightweight aggregate.Flyash, wilkinite, rhombohedral iron ore, the chemical ingredients of silicon carbide and coke is represented in table 1.And, by the flyash in the table 1 is mixed with the first reagent grade goods as raw-material yellow soda ash of basic metal and salt of wormwood, under the conditions shown in Table 2 under a preset temperature electric furnace internal heating 10 minutes, in stove, take out and cooling, thereby pulverize makes reduction fusing point agent then.
[working example 1～3 :] with rhombohedral iron ore and carbonaceous material foaming
Aforementioned starting material are collected with the composition shown in the table 3 and are weighed, then in a kind of grinding in ball grinder and mixing.Powdered raw-material size distribution is measured by a laser diffraction type size distribution instrument, and expression in table 3.
Add water the powdered starting material of acquisition to, and granulation is into about the sphere of 5～15 mm dias in a pan pelletizer, dry then, particle is delivered to roasting in the rotary kiln (the brick linings that interior diameter 500 mm lengths are 4800 millimeters) afterwards.Alkali-metal chemical ingredients is as shown in table 3 in the artificial lightweight aggregate after roasting.
The adiabatic drying proportion and the water-intake rate of the artificial lightweight aggregate of roasting are measured according to JIS A1110, and measure crush strength for the about 10 millimeters artificial lightweight aggregate of diameter.The result and the maturing temperature that obtain are as shown in table 4.Adiabatic drying proportion is about 1.0～1.5, therefore, obtain almost with a kind of industrial artificial lightweight aggregate be 1.2～1.4 the identical artificial lightweight aggregate of adiabatic drying proportion.And, be that 1.2～1.3 o'clock crush strength is 11N～15N at adiabatic drying proportion, the industrial artificial lightweight aggregate respective value that contrasts is 5N～6N, even be at adiabatic drying proportion, still has 7N～8N at 1.0 o'clock, obtains the artificial lightweight aggregate of high specific tenacity.Water-intake rate reduced to about 5% in 24 hours.
[comparison example 1,7,13]
Reduce few and gross weight alkali metal compound in baked artificial lightweight aggregate of fusing point agent by weight percentage less than 2% situation under, even maturing temperature is increased to 1210 ℃～1260 ℃, the particulate roasting is abundant inadequately, therefore adiabatic drying proportion surpasses 1.55, this is than target value (1.5) height, crush strength is low, the water-intake rate height.
[comparison example 2,8,14]
Reducing fusing point agent gross weight abundant and alkali metal compound in baked artificial lightweight aggregate by weight percentage above under 6% situation, particle surface melts at low temperatures, and maturing temperature drops to 1050 ℃～1120 ℃, so the inner roasting of particulate is abundant inadequately.Like this, crush strength is reduced to 2N～4N, and water-intake rate is increased to 10%～11%.
[comparison example 3,9,15]
Even the gross weight of alkali metal compound is by weight percentage 2～6%, under the few situation of rhombohedral iron ore addition, water-intake rate also reduces although intensity increases, and adiabatic drying proportion surpasses 1.55, and this is than target value (1.5) height.Therefore lightweight is abundant inadequately.
[comparison example 4,10,16]
The gross weight of alkali metal compound is by weight percentage 2～6%, even the rhombohedral iron ore addition surpasses 10% by weight percentage, but proportion, intensity or water-intake rate do not have improvement effect.
[comparison example 5,11,17]
Under the situation of not adding carbonaceous material, can acceleration of sintering, therefore, adiabatic drying proportion height, water-intake rate height when low strength.
[comparison example 6,12,18]
If the addition of carbonaceous material surpasses 10% by weight percentage, it is about 1.65 that adiabatic drying proportion is increased to, and specific tenacity is reduced to 6N～8N.
[working example 32～65: carbonaceous material and silicon carbide are worked in coordination with lighting]
Through collecting and weighing, pulverize also mixes aforementioned starting material in ball mill then with the composition in the table 5.The raw-material size distribution of measuring by laser diffraction type size distribution instrument of powdered is illustrated in the table 5.
Add water the powdered starting material of acquisition to, and granulation is into about the sphere of 5～15 mm dias in a pan pelletizer, dry then, particle is delivered to roasting in the rotary kiln (the brick linings that interior diameter 500 mm lengths are 4800 millimeters) afterwards.Alkali-metal content and by the Fe of iron conversion gained in the artificial lightweight aggregate after roasting
2O
3Content is as shown in table 5.
The proportion of the artificial lightweight aggregate of roasting and water-intake rate are measured according to JIS A1110, and measure crush strength for the about 10 millimeters artificial lightweight aggregate of diameter.The result and the maturing temperature that obtain are as shown in table 6.Adiabatic drying proportion is about 0.5～1.0, therefore, obtains a kind of extremely light artificial lightweight aggregate.And, be that 0.5 crush strength is 3N near adiabatic drying proportion, yet, be that 1.0 crush strength is 7N～8N near adiabatic drying proportion, obtain the artificial lightweight aggregate of high specific tenacity.At adiabatic drying proportion is 0.5 o'clock, and water-intake rate was 12%～13% in 24 hours, was 1.0 o'clock at adiabatic drying proportion, and water-intake rate was 6% in 24 hours.
[comparison example 19]
Reduce few and gross weight alkali metal compound in baked artificial lightweight aggregate of fusing point agent by weight percentage less than 2% situation under, even maturing temperature is increased to 1300 ℃, the particulate roasting is abundant inadequately, even therefore add whipping agent, adiabatic drying proportion is up to 1.21, crush strength is low to moderate 2.2N, and the water-intake rate height is increased to 14.2.
[comparison example 20]
Reducing fusing point agent gross weight abundant and alkali metal compound in baked artificial lightweight aggregate by weight percentage above under 6% situation, particle surface melts at low temperatures, and maturing temperature drops to 1000 ℃, so the inner roasting of particulate is abundant inadequately.Like this, adiabatic drying proportion is increased to 1.37, and this value is higher than target value (1.0), and crush strength is reduced to 2.7N, and water-intake rate is increased to 13.1%.
[comparison example 21]
Even the gross weight of alkali metal compound is by weight percentage 2～6%, and the rhombohedral iron ore addition makes Fe after roasting
2O
3The ratio that comprises surpass 10%, adiabatic drying proportion or intensity do not have noticeable change, and rhombohedral iron ore content increases DeGrain.
[comparison example 22]
Under the situation of not adding silicon carbide, adiabatic drying proportion becomes 1.15, does not drop to target value (1.0).At this, this example only comprises implements rhombohedral iron ore reductive working example by carbonaceous material.
[comparison example 23]
Even the silicon carbide addition surpasses 1% by weight percentage, can not improve yet reduce adiabatic drying proportion effect.
[comparison example 24]
Under the situation that does not have fully to add at coke (carbonaceous material), carry out oxidation in artificial lightweight aggregate inside, so the big minimum that rises of bubble, adiabatic drying proportion is 1.44, does not reach target value (1.0).
[comparison example 25]
Become minimum if the addition of coke (carbonaceous material) surpasses the degree of oxidation on the surface of 1% artificial lightweight aggregate by weight percentage, like this, maturing temperature can not increase.Therefore, proportion increases and intensity is reduced to 6N～8N.
[working example 66～94]
Aforementioned starting material are collected and load-bearing with the composition shown in the table 7, pulverize and mixing in a kind of ball mill then.Powdered raw-material size distribution is measured by a laser diffraction type size distribution instrument, and expression in table 7.
Add water the powdered starting material of acquisition to, and granulation is into about the sphere of 5～15 mm dias in a pan pelletizer, dry then, particle is delivered to roasting in the rotary kiln (the brick linings that interior diameter 500 mm lengths are 4800 millimeters) afterwards.Alkali-metal chemical ingredients is as shown in table 7 in the artificial lightweight aggregate after roasting.The proportion of the artificial lightweight aggregate of roasting and water-intake rate are measured according to JIS A1110, and measure crush strength for the about 10 millimeters artificial lightweight aggregate of diameter.The result and the maturing temperature that obtain are as shown in table 8.Adiabatic drying proportion about 1.5～2.0.And crush strength is 15N～40N, and the industrial artificial lightweight aggregate respective value that contrasts is 5N～6N, obtains the artificial lightweight aggregate of high specific tenacity.Water-intake rate also reduced to about 0.3%～4% in 24 hours.
[comparison example 26,30,34]
Reduce few and gross weight alkali metal compound in baked artificial lightweight aggregate of fusing point agent by weight percentage less than 2% situation under, even maturing temperature is increased to 1250 ℃～1270 ℃, the particulate roasting is abundant inadequately, so crush strength is low, the water-intake rate height.
[comparison example 27,31,35]
Reducing fusing point agent gross weight abundant and alkali metal compound in baked artificial lightweight aggregate by weight percentage above under 6% situation, particle surface melts at low temperatures, and like this, maturing temperature can not be increased near 1000 ℃.Therefore, because the inner roasting of particulate is abundant inadequately, like this, crush strength is reduced to 5N～9N, and water-intake rate is increased to 5%～8%.
[comparison example 28,32,36]
Even the gross weight of alkali metal compound is by weight percentage 2～6%, under the situation of not adding carbonaceous material (coke), therefore granule interior can not promote the formation of liquid phase not at reduced state, can not obtain enough intensity like this.
[comparison example 29,33,37]
The gross weight of alkali metal compound is by weight percentage 2～6%, if the rhombohedral iron ore addition surpasses 10% by weight percentage, and adiabatic drying proportion then, intensity or water-intake rate do not have improvement effect, and this is bad.
For the present invention, according to top described, utilize flyash can effectively make a kind of artificial lightweight aggregate of low-cost and high-quality, this flyash is produced with as starting material by coal firing boiler.As a result, flyash can reuse as the material of construction etc. that requires light weight, handles as industrial waste when replacing reclaiming.Therefore, it is conspicuous to the contribution of the stable supply of environment protection and energy.
[table 1] component flyash wilkinite rhombohedral iron ore silicon carbide coke SiO
256.2 65.8 1.03 143.25 7.56Al
2O
332.1 13.2 97.8 3.24Fe
2O
33.57 1.55CaO 0.59 0.55MgO 1.4 1.8Na
2O 0.22 1.59K
2O 0.48 1.7SO
30.48 0.61C 29.06 88.3I.L. 13.42 total amounts 94.56 100.09 98.83 172.31 99.71
[table 2] reduces heat treatment temperature agent alkali metal ℃ NO. (% by weight) (% by weight) (heavy %) (% by weight) 1-1 70 30 0 21.0 12001-2 58 42 0 31.9 12001-3 50 50 0 38.1 11001-4 40 60 0 48.0 10001-5 30 70 0 58.9 10002-1 70 0 30 23.8 12002-2 60 0 40 32.6 12002-3 50 0 50 41.9 11002-4 45 0 55 46.9 10002-5 30 0 70 62.7 10003-1 70 15 15 22.7 12003-2 60 20 20 31.1 12003-3 50 25 25 40.2 11003-4 44 28 28 46.1 10003-5 30 35 35 61.0 1000 after the heat treatment of fusing point flyash sodium carbonate potash
[table 3]
Material is formed the particle particle size
Flyash reduces fusing point wilkinite rhombohedral iron ore char N a
2O+K
2O
(weight %) agent (weight %) (weight %) (weight %) (weight %) (μ m)
No. ratio embodiment 1 89 4133 2.1 9
2 83 1-2 10 1 3 3 4 13
3 78 15 133 5.6 9 comparative examples 1 90 3133 1.7 13
2 76 17 1 3 3 6.3 13
3 86 1-2 10 1 0 3 4.1 10
4 74 10 1 12 3 3.9 14
5 86 10 1 3 0 4.1 9
6 75 10 13 11 4.3 11 embodiment 4 89 4133 2.4 9
5 85 8 1 3 3 4 9
6 81 12 1 3 3 5.7 12
7 87 1-3 8 1 1 3 4 13
8 78 8 1 10 3 3.9 11
9 87 8 1 3 1 3.9 8
10 78 813 10 4.2 7 comparative examples 7 91 2133 1.6 11
8 79 14 1 3 3 6.4 12
9 88 8 1 0 3 4 15
10 76 1-3 8 1 12 3 3.9 10
11 88 8 1 3 0 3.9 12
12 77 813 11 4.2 12 embodiment 11 90 3133 2.3 14
12 87 1-4 6 1 3 3 3.8 10
13 83 10 133 5.8 10 comparative examples 13 91 2133 1.8 12
14 88 12 1 3 3 6.9 10
15 90 1-4 6 1 0 3 3.9 12
16 78 6 1 12 3 3.7 11
17 90 6 1 3 0 3.7 7
18 79 613 11 4 10 embodiment 14 89 4133 2.1 9
[table 3] is continuous
15 84 2-2 9 1 3 3 3.9 10
16 78 15 133 5.9 10 embodiment 17 90 3133 2.1 12
18 86 2-3 7 1 3 3 3.9 11
19 82 11 133 5.6 12 embodiment 20 90 3133 2.2 12
21 86 2-4 7 1 3 3 4.2 11
22 83 10 133 5.7 9 embodiment 23 89 4133 2.1 10
24 83 3-2 10 1 3 3 4 8
25 78 15 133 5.7 11 embodiment 26 90 31332 11
27 85 3-3 8 1 3 3 4.2 11
28 81 12 133 3.9 10 embodiment 29 90 3133 2.2 11
30 86 3-4 7 1 3 3 4.2 13
31 83 10 1 3 3 5.7 10
[table 4]
Adiabatic drying crush strength (N) water-intake rate maturing temperature
Proportion (24 hours) (D.B.%) (℃) embodiment 1 1.44 18 4.7 1230
2 1.13 10 5.8 1180
3 0.98 7 6.1 1150 comparative examples 1 1.58 3 8.8 1260
2 1.61 3 10.2 1120
3 1.78 21 4.3 1200
4 1.22 12 5.4 1160
5 1.55 4 8.1 1200
6 1.63 8 5.7 1110 embodiment 4 1.39 16 4.8 1200
5 1.15 10 5.7 1160
6 1.10 9 6.0 1120
7 1.26 13 5.2 1190
8 1.11 10 5.8 1140
9 1.26 12 5.3 1170
10 1.29 15 5.0 1150 comparative examples 7 1.62 3 9.7 1240
8 1.66 2 11.4 1070
9 1.74 23 4.3 1180
10 1.19 11 5.5 1140
11 1.57 4 8.4 1180
12 1.65 6 6.7 1140 embodiment 11 1.51 21 4.5 1180
12 1.33 15 5.0 1140
13 1.26 11 5.4 1110 comparative examples 13 1.60 2 11.1 1210
14 1.81 4 7.9 1050
15 1.59 19 4.5 1160
16 1.27 11 5.4 1120
17 1.58 3 9.5 1150
18 1.64 6 6.4 1130 embodiment 14 1.42 18 4.7 1190
15 1.12 9 5.9 1150
16 1.05 8 6.2 1120
[table 4] is continuous
17 1.39 17 4.7 1170
18 1.12 10 5.8 1130
19 0.95 9 6.0 1100
20 1.50 20 4.5 1150
21 1.23 12 5.3 1110
22 1.19 11 5.5 1070
23 1.43 19 4.6 1200
24 1.14 9 5.9 1160
25 1.06 8 6.3 1130
26 1.45 20 4.6 1180
27 1.14 10 5.8 1140
28 1.12 9 5.9 1100
29 1.53 23 4.4 1160
30 1.26 13 5.2 1100
31 1.21 11 5.4 1080
[table 5]
Material is formed the particle particle size
Flyash reduces fusing point wilkinite rhombohedral iron ore silicon carbide char N a
2O+K
2O Fe
2O
3
(weight %) agent (weight %) (weight %) (weight %) (weight %) (weight %) (weight %) (μ m)
No.E-32 86.5 4 1 3 0.5 5.0 2.1 6.8 12 33 80.5 1-2 10 1 3 0.5 5.0 4.1 6.7 12 34 75.5 15 1 3 0.5 5.0 5.8 6.6 14E-35 86.5 4 1 3 0.5 5.0 2.4 6.8 12 36 77.9 10 1 1 0.1 10.0 5.1 4.6 12 37 82.5 10 1 1 0.5 5.0 4.9 4.6 11 38 86.8 10 1 1 1.0 0.2 4.7 4.6 10 39 75.9 1-3 10 1 3 0.1 10.0 5.1 6.8 14 40 80.6 10 1 3 0.5 5.0 4.9 6.7 14 41 84.8 10 1 3 1.0 0.2 4.7 6.6 11 42 72.9 10 1 6 0.1 10.0 5.0 10.0 12 43 77.5 10 1 6 0.5 5.0 4.9 9.8 13 44 81.8 10 1 9 1.0 0.2 4.7 9.5 12 45 76.5 15 1 3 0.5 5.0 6.9 6.6 10C-19 88.5 2 1 3 0.5 5.0 1.6 6.8 14 20 72.5 18 1 3 0.5 5.0 8.2 6.5 11 21 86.5 10 1 7 0.5 5.0 4.8 10.8 11 22 81.0 1-3 10 1 3 0.0 5.0 4.9 6.7 15 23 79.8 10 1 3 1.2 5.0 4.9 6.7 10 24 85.5 10 1 3 0.5 0.0 4.7 6.6 12 25 73.5 10 1 3 0.5 12.0 5.2 6.8 12E-46 86.5 4 1 3 0.5 5.0 2.8 6.8 11 47 82.5 1-4 8 1 3 0.5 5.0 4.9 6.7 14 48 78.5 12 1 3 0.5 5.0 7.0 6.6 13E-49 86.5 4 1 3 0.5 5.0 2.1 6.8 13 50 80.5 2-2 8 1 3 0.5 5.0 4.3 6.7 13 51 75.5 15 1 3 0.5 5.0 6.0 6.6 11E-52 86.5 4 1 3 0.5 5.0 2.6 6.8 11 53 77.9 10 1 1 0.1 10.0 5.5 4.6 14 54 82.5 10 1 1 0.5 5.0 4.9 4.6 13 55 86.8 10 1 1 1.0 0.2 5.1 4.6 12 56 75.9 10 1 3 0.1 10.0 5.5 6.8 10 57 80.5 2-3 10 1 3 0 5 5.0 5.3 6.7 13 58 84.8 10 1 3 1.0 0.2 5.1 6.5 12 59 72.9 10 1 6 0.1 10.0 5.5 10.0 15
[table 5] is continuous
60 77.5 10 1 6 0.5 5.0 5.3 9.8 13
61 81.8 10 1 6 1.0 0.2 5.1 9.5 14
62 75.5 15 1 3 0.5 5.0 7.5 6.6 10
E-63 86.5 4 1 3 0.5 5.0 2.8 6.8 12
64 82.5 2-4 8 1 3 0.5 5.0 4.8 6.7 12
65 78.5 12 1 3 0.5 5.0 6.8 6.6 12
* E: embodiment
C: comparative example
[table 6]
Adiabatic drying crush strength (N) water-intake rate maturing temperature
Proportion (24 hours) (D.B.%) (℃) embodiment 32 0.69 4.8 9.2 1250
33 0.51 3.0 11.8 1050
34 0.56 3.5 10.9 1020 embodiment 35 0.72 5.1 8.8 1190
36 0.97 7.6 6.3 1070
37 0.88 6.4 7.2 1070
38 0.75 5.2 9.0 1080
39 0.89 6.2 8.1 1030
40 0.53 3.2 11.5 1030
41 0.52 3.0 12.7 1030
42 0.91 7.0 8.9 1020
43 0.48 2.9 12.3 1020
44 0.50 2.8 13.0 1030
45 0.54 3.3 11.4 1020 comparative examples 19 1.21 2.2 14.2 1300
20 1.37 9.7 3.1 1000
21 0.56 3.5 11.1 1030
22 1.15 10.1 4.7 1030
23 0.53 3.2 11.5 1030
24 1.44 5.0 16.7 1030
25 0.67 3.4 11.6 1030 embodiment 46 0.85 6.6 7.3 1130
47 0.63 4.3 10.1 1030
48 0.78 5.3 8.5 1020 embodiment 49 0.64 4.2 9.0 1250
50 0.50 3.2 11.0 1040
51 0.57 3.6 12.0 1020 embodiment 52 0.72 5.3 8.6 1160
53 0.97 6.6 6.7 1070
54 0.88 6.6 7.2 1070
55 0.75 4.2 9.0 1070
56 0.89 5.7 8.1 1020
57 0.53 3.2 11.5 1030
58 0.52 2.8 12.7 1030
59 0.91 5.9 6.9 1020
[table 6] is continuous
60?0.48 2.9 12.1 1020
61?0.50 2.6 13.0 1020
62 0.54 3.3 11.4 1020 embodiment 63 0.79 6.0 8.4 1130
64?0.62 4.0 10.1 1030
65?0.72 4.7 8.6 1020
[table 7]
Material is formed the particle particle size
Flyash reduces fusing point wilkinite char N a
2O+K
2O
(weight %) agent (weight %) (weight %) (weight %) (μ m)
No. ratio embodiment 66 92 413 2.1 11
67 86 1-2 10 1 3 4.1 12
68 81 15 13 5.7 10 comparative examples 26 93 313 1.8 9
27 79 17 1 3 6.2 11
28 89 1-2 10 1 0 4 9
29 78 10 1 11 4.3 10 embodiment 69 92 413 2.4 9
70 88 8 1 3 4 9
71 84 12 1 3 5.7 10
72 90 1-3 8 1 1 4 11
73 81 81 10 4.2 8 comparative examples 30 94 213 1.6 11
31 82 14 1 3 6.5 12
32 91 8 1 0 4 11
33 80 1-3,10 1 11 4.3 9 embodiment 74 93 313 2.3 8
75 90 1-4 6 1 3 3.9 8
76 86 10 13 5.9 7 comparative examples 34 94 213 1.8 11
35 84 12 1 3 6.9 11
36 93 1-4 6 1 0 3.8 13
37 82 61 11 4.1 14 embodiment 77 92 413 2.2 7
78 87 2-2 9 1 3 3.9 7
79 81 15 13 5.9 9 embodiment 80 93 313 2.2 11
81 89 2-3 7 1 3 3.9 10
82 85 11 13 5.6 8 embodiment 83 90 313 2.2 8
84 89 2-4 7 1 3 4.3 14
85 86 10 1 3 5.8 8
[table 7] continues embodiment 86 92 413 2.1 10
87 86 3-2 10 1 3 4 10
88 81 15 13 5.7 9 embodiment 89 93 3132 10
90 88 3-3 8 1 3 4.2 11
91 84 12 13 5.9 14 embodiment 92 93 313 2.3 11
93 89 3-4 7 1 3 4.2 9
94 86 10 1 3 5.7 7
[table 8]
Adiabatic drying crush strength (N) water-intake rate maturing temperature
Proportion (24 hours) (D.B.%) (℃) embodiment 66 1.89 37 0.9 1240
67 1.78 28 1.9 1130
68 1.52 15 3.9 1000 comparative examples 26 1.63 10 6.0 1270
27 1.57 7 7.1 1010
28 1.80 4 3.6 1140
29 1.74 19 2.6 1140 embodiment 69 1.97 36 0.3 1230
70 1.80 28 1.8 1150
71 1.61 16 3.0 1050
72 1.79 29 1.7 1140
73 1.73 27 2.1 1130 comparative examples 30 1.84 8 4.5 1270
31 1.57 5 5.5 1000
32 1.70 4 5.0 1150
33 1.65 13 4.2 1110 embodiment 74 1.94 37 0.5 1220
75 1.75 28 2.0 1130
76 1.56 18 3.6 1030 comparative examples 34 1.79 10 3.9 1250
35 1.58 9 7.8 990
36 1.78 3 4.0 1140
37 1.65 25 3.7 1130 embodiment 77 1.93 37 0.6 1230
78 1.76 28 2.3 1130
79 1.54 17 3.5 1020
80 1.92 36 0.7 1230
81 1.77 27 2.0 1130
82 1.59 19 3.3 1050
83 1.95 38 0.5 1230
84 1.78 31 1.7 1130
85 1.71 24 2.4 1130
86 1.97 39 0.3 1240
87 1.78 26 2.2 1140
[table 8] is continuous
88 1.60 22 3.1 1050
89 2.00 40 0.2 1250
90 1.73 27 2.5 1130
91 1.59 20 3.5 1030
92 1.76 27 1.7 1130
93 1.73 25 2.3 1120
94 1.61 19 3.2 1060
Claims (12)
1. artificial lightweight aggregate, make by following steps: flyash is mixed to obtain a kind of mixture with a kind of reduction fusing point agent, a kind of agglutinant and a kind of whipping agent, pulverizing this mixture makes its median size be at most 15 microns to obtain a kind of powder, form the groupuscule of described powder, then in 1000 ℃ to 1250 ℃ temperature range, the described groupuscule of roasting is to produce the above-mentioned artificial lightweight aggregate of 1.0～0.5 adiabatic drying proportion.
2. the method for a manufacture of intraocular light aggregate, its step comprises: flyash is mixed to obtain a kind of mixture with a kind of reduction fusing point agent, a kind of agglutinant and carbonaceous material, pulverize this mixture, to obtain a kind of median size powder of 15 microns at the most, form the groupuscule of described powder, then in 1000 ℃ to 1250 ℃ temperature range, the described groupuscule of roasting.
3. the method for manufacture of intraocular light aggregate as claimed in claim 2 is characterized in that the content range of described carbonaceous material accounts for 0.2%～10% of flyash by weight percentage
4. the method for manufacture of intraocular light aggregate as claimed in claim 2 is characterized in that, also sneaks into ferric oxide in mixture.
5. the method for manufacture of intraocular light aggregate as claimed in claim 4 is characterized in that, sneaks into supercarbonate in mixture.
6. as the method for arbitrary described manufacture of intraocular light aggregate in claim 4 and 5, it is characterized in that, this iron oxide content scope accounts for 1%～10% of flyash by weight percentage, the content range that the carbonaceous material content range accounts for 0.2%～10% and silicon carbide of flyash by weight percentage accounts for 0%～1% of flyash by weight percentage.
7. as the method for arbitrary described manufacture of intraocular light aggregate in the claim 2 to 6, it is characterized in that reducing the fusing point agent and make: a kind of alkali metal compound is mixed with flyash, make in mixture Na by following steps
2O and K
2The total amount of O by weight percentage respectively or all in 30%～50% scope, at 1000 ℃～1200 ℃ temperature range internal heating and fusing said mixture to form a kind of vitreous material, cooling and this vitreous material of fragmentation then.
8. as the method for arbitrary described manufacture of intraocular light aggregate in the claim 2 to 6, it is characterized in that described reduction fusing point agent makes by following steps: a kind of alkali metal compound is mixed with flyash, make in mixture Na
2O and K
2The total amount of O by weight percentage respectively or all in 30%～50% scope, at 1000 ℃～1200 ℃ temperature range internal heating and this mixture of fusing to form a kind of vitreous material, cooling and this vitreous material of fragmentation then; And, reduce the fusing point agent and add in the flyash, make Na
2O and K
2Total weight range of O accounts for 2%～6% of baked article by weight percentage.
9. as the method for arbitrary described manufacture of intraocular light aggregate in claim 7 and 8, it is characterized in that described alkali metal compound is yellow soda ash or salt of wormwood.
10. the method for manufacture of intraocular light aggregate as claimed in claim 2 is characterized in that described groupuscule is a particle, and rotary kiln is as stoving oven.
11. a reduction fusing point agent that is used for artificial lightweight aggregate, it makes by following steps: a kind of alkali metal compound is mixed with flyash, make in mixture Na
2O and K
2The total amount of O by weight percentage respectively or all in 30%～50% scope, at 1000 ℃～1200 ℃ temperature range internal heating and fusing said mixture to form a kind of vitreous material, cooling and this vitreous material of fragmentation then.
12. a kind of reduction fusing point agent that is used for artificial lightweight aggregate as claimed in claim 11 is characterized in that described alkali metal compound is yellow soda ash or salt of wormwood.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP274675/97 | 1997-10-07 | ||
| JP27467697A JPH11116301A (en) | 1997-10-07 | 1997-10-07 | Production of artificial lightweight aggregate |
| JP27467597A JPH11116299A (en) | 1997-10-07 | 1997-10-07 | Artificial lightweight aggregate and its production |
| JP274676/97 | 1997-10-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1218014A true CN1218014A (en) | 1999-06-02 |
Family
ID=26551142
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98124331A Pending CN1218014A (en) | 1997-10-07 | 1998-10-07 | Artificial lightweight aggregate manufacturing method therefor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1218014A (en) |
| GB (1) | GB2330138A (en) |
Cited By (1)
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|---|---|---|---|---|
| CN106007613A (en) * | 2016-05-18 | 2016-10-12 | 东南大学 | Gypsum-based composite material for self-insulation wall and preparation method of gypsum-based composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426382A (en) | 2000-03-14 | 2003-06-25 | 詹姆斯·哈迪研究有限公司 | Fiber cement building materials with low density additives |
| AUPR507201A0 (en) * | 2001-05-16 | 2001-06-07 | Unisearch Limited | Concrete aggregate |
| KR20050058478A (en) | 2002-08-23 | 2005-06-16 | 제임스 하디 인터내셔널 파이낸스 비.브이. | Synthetic hollow microspheres |
| US7993570B2 (en) | 2002-10-07 | 2011-08-09 | James Hardie Technology Limited | Durable medium-density fibre cement composite |
| US20090156385A1 (en) | 2003-10-29 | 2009-06-18 | Giang Biscan | Manufacture and use of engineered carbide and nitride composites |
| US7998571B2 (en) | 2004-07-09 | 2011-08-16 | James Hardie Technology Limited | Composite cement article incorporating a powder coating and methods of making same |
| EP1856003A2 (en) | 2005-02-24 | 2007-11-21 | James Hardie International Finance B.V. | Alkali resistant glass compositions |
| CA2632760C (en) | 2005-12-08 | 2017-11-28 | James Hardie International Finance B.V. | Engineered low-density heterogeneous microparticles and methods and formulations for producing the microparticles |
| AU2007236561B2 (en) | 2006-04-12 | 2012-12-20 | James Hardie Technology Limited | A surface sealed reinforced building element |
| US8209927B2 (en) | 2007-12-20 | 2012-07-03 | James Hardie Technology Limited | Structural fiber cement building materials |
| US10196296B2 (en) | 2015-01-17 | 2019-02-05 | Hamid Hojaji | Fluid permeable and vacuumed insulating microspheres and methods of producing the same |
| CN117623739B (en) * | 2024-01-23 | 2024-04-12 | 包头市安德稀耐新材料有限公司 | Light high-strength aggregate prepared from rare earth coupling solid waste and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU66860A1 (en) * | 1973-01-19 | 1974-08-19 | ||
| KR950001668B1 (en) * | 1990-10-30 | 1995-02-28 | 이춘구 | Process for the preparation of lightweight building materials using flyash |
| AU3528293A (en) * | 1992-03-19 | 1993-09-23 | Lightweight Blocks Pty Ltd | Lightweight aggregate material |
| JPH1095648A (en) * | 1996-09-19 | 1998-04-14 | Sumitomo Metal Mining Co Ltd | Production of artificial aggregate |
-
1998
- 1998-10-07 CN CN98124331A patent/CN1218014A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007613A (en) * | 2016-05-18 | 2016-10-12 | 东南大学 | Gypsum-based composite material for self-insulation wall and preparation method of gypsum-based composite material |
| CN106007613B (en) * | 2016-05-18 | 2018-01-30 | 东南大学 | A kind of self heat insulation wall gypsum based composite and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| GB9821749D0 (en) | 1998-12-02 |
| GB2330138A (en) | 1999-04-14 |
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