CN1197050A - Non-sintering powdered coal ash ceramic pellets and its prodn. method - Google Patents

Non-sintering powdered coal ash ceramic pellets and its prodn. method Download PDF

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Publication number
CN1197050A
CN1197050A CN97105788A CN97105788A CN1197050A CN 1197050 A CN1197050 A CN 1197050A CN 97105788 A CN97105788 A CN 97105788A CN 97105788 A CN97105788 A CN 97105788A CN 1197050 A CN1197050 A CN 1197050A
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Prior art keywords
ceramsite
fly ash
inner core
portland cement
shell
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庄实传
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QINGDAO APPLIED CHEMICAL BUILDING MATERIAL PLANT
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QINGDAO APPLIED CHEMICAL BUILDING MATERIAL PLANT
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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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1055—Coating or impregnating with inorganic materials
    • C04B20/1077—Cements, e.g. waterglass
    • 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
    • C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
    • 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

Abstract

A non-sinter powdered coal ash haydite is composed of kernel and shell. Said kernel contains powdered coal ash (84-90 Wt.%), ordinary Portland cement (8-13), gypsum (1-2.2) and additive of concrete (1-1.2). Said shell is made of ordinary Portland cement. Its preparing steps include grinding, mixing with water, making balls, coating shell and curing. Said haydite features high alkalinity, high strength and carbonization resistance.

Description

Non-sintered flyash haydite and its production process
The invention relates to a non-sintered fly ash lightweight aggregate for light concrete and a manufacturing method thereof, in particular to non-sintered fly ash ceramsite and a manufacturing method thereof.
The invention patent application named 'non-calcined fly ash lightweight aggregate manufacturing method' is published in the patent publication of the Chinese patent office on 14 th 6 th 1989, and the application numbers are as follows: 86106928, approval number: CN 1004482B. The application of the patent is a method for manufacturing concrete lightweight aggregate by using fly ash as a main raw material and adding fly ash aluminosilicate cement clinker and dihydrate gypsum, the lightweight aggregate manufactured by the method uses more fly ash, is beneficial to comprehensive utilization of industrial waste fly ash, protects the environment, and saves energy by using the method without sintering. However, the lightweight aggregate manufactured by the method has low alkalinity, low surface compactness, low strength, poor wear resistance, easy surface sanding and no carbonization resistance, and influences the bonding with other components in concrete. In addition, the fineness of the mixture of the lightweight aggregate is below 8 percent (0.08mm square hole screen allowance), the production efficiency is low during grinding, the power consumption is high, and the production cost is increased.
The invention aims to provide non-sintered fly ash ceramsite with high alkalinity, high strength, carbonization resistance and low cost.
Another object of the present invention is to provide a method for producing non-sintered fly ash ceramsite, which can save energy, reduce cost and improve production efficiency.
The invention aims to realize the non-sintered fly ash ceramsite for concrete, which is characterized by comprising a spherical inner core 1 and an outer shell 2 attached outside the inner core 1. Wherein:
a. the composition of the core 1 (wt.%):
84-90 fly ash
8-13 ordinary portland cement
1-2.2 Gypsum Fibrosum
1-1.2 concrete admixture
b. The shell 2 is made of ordinary portland cement.
The chemical compositions of fly ash are relatively complex, but they have in common that the composition is mainly silicon oxide (SiO) except carbon2) And alumina (Al)2O3) Typically 65-85% of the total, which isthe major component of the chemical properties of the fly ash. Active SiO in fly ash2、Al2O3The self-activating agent is inactive, and needs to be activated to hydrate under the condition of an alkaline medium, and the hardening agent has a gelling property. Ordinary portland cement C3S content is high, ordinary portland cement is selected as alkali activator, C3S is hydrated around Si-O (silicon-oxygen tetrahedron) in fly ash to generate CSH (B) or C2SH.C2SH2(A) While precipitating more Ca (OH)2。C3The more S, the formation of C upon hydration2SH2.C2More SH, simultaneous precipitation of Ca (OH)2Too much, constituting a high baseThe probability of corrosion excitation of Si-O bonds of silicon-oxygen tetrahedron in the fly ash by the sexual medium is high, so that the silicon-oxygen tetrahedron is gradually damaged. While forming a new hydrate, Al is eluted2O3And the like. In order to further activate the fly ash, sulfate activation compatible with an alkaline activator is required. The gypsum has soluble CaSO4Can be used as sulfate excitant. Gypsum plasterDissolving SO in the medium of alkaline activator3 --It reacts with Ca (OH) in the medium2、Al2O3(Al in fly ash)2O3) The calcium sulphoaluminate hydrate (namely E salt) is generated by combination, and Al (OH) is separated out3Aluminium glue and quickly connect with newly generated CSH, so that the hydrate is quickly compact and plays a role in strength. The more the alkali activator and the sulfate activator are added, the better the gelling performance of the ceramsite is, and particularly, the influence of the addition of the alkali activator on the performance of the ceramsite is more obvious. However, excessive addition of alkali activator ordinary portland cement increases the cost of the ceramsite. In order to utilize more fly ash and reduce the cost, the concrete admixture is added into the material of the inner core 1 as an active agent, and the concrete admixture can play a role in early strengthening and enhancing the ceramic material. The invention selects a reasonable proportioning range among the fly ash, the common Portland cement, the gypsum and the concrete admixture, so that the cost of the ceramsite is reduced on the premise of meeting various performance indexes. The outer surface of the inner core 1 is coated with a layer of ordinary portland cement shell 2, on one hand, the cement of the shell 2 has strong excitation effect on the fly ash on the surface of the inner core 1, on the other hand, in the maintenance process of ceramsite, the cement of the shell 2 is rapidly hydrated, and the reaction formula is as follows: during the cement hardening process, a network structure is formed and Ca (OH) is released2These C2SH2、Ca(OH)2And C in cement3A、C4A3S、C11AT.CaF2Can be further hydrated and hardened and filled in the reticular structure, changes the composition and the structure of the surface of the ceramsite, and forms a compact and hard thin shell. The thin shell greatly improves the surface alkalinity and compactness of the ceramsite, improves the strength, and enhances the capabilities of carbonization resistance, abrasion resistance and the like.
In order to treat industrial waste and reduce cost, the sulfate excitant gypsum can be industrial waste with wide sources and byproducts thereof, namely fluorgypsum, phosphogypsum and salt gypsum, or can be natural dihydrate gypsum as long as SO3The content of (B) is more than 35% and can be selected.
The fineness of the mixture of the inner core 1 is 8-12% (0.08mm square hole screen allowance). When the fineness of the mixture of the inner core 1 is more than 13 percent of the screen residue of a square hole with 0.08mm, the strength of the ceramsite is reduced to 1.5-2.5 MPa. When the fineness is below 8 percent, the intensity of the ceramsite is high, but the yield is low, the power consumption is large, and the cost is increased. Therefore, the fineness of the mixture of the inner core 1 is selected to be 8-12% (0.08mm square hole screen allowance) to be most suitable.
The thickness of the case 2 of the present invention is 0.05-0.1 mm.
When the thickness of the shell 2 is less than 0.05mm, the thickness of the cladding layer is too low, the cladding layer on the surface is too thin, the cladding effect cannot be achieved, and the performance of the ceramsite is not greatly improved. When the thickness of the shell 2 is more than 0.1mm, the cladding layer is too thick, the use of the common Portland cement is excessive, and the cost of the ceramsite is increased. Only when the thickness of the shell 2 is 0.05-0.1mm, the cost of the ceramsite is proper, and the cladding effect is optimal.
The thickness of the shell 2 can be measured by cutting the clad and unclad ceramsite from the center to make a polished sheet, measuring the number of cladding thickness points along the periphery of the ceramsite by using a low-power lens on a German equivalent-Z microscope, recording the points in an integrator, and then averaging the thicknesses of thousands of points.
The invention relates to a method for manufacturing non-sintered fly ash ceramsite, which comprises the following steps:
a. the raw materials of the fly ash, the ordinary portland cement, the gypsum and the concrete admixture of the inner core 1 are metered and simultaneously fed into a ball mill for mixing and grinding, and the fineness of the mixture is 8-12% (0.08mm square hole screen allowance);
b. the milled mixture is sent into a stirrer to be stirred, atomized water is sprayed into the mixture, the water content (weight) of the mixture reaches 18%, and the wet mixture is stirred with the stirrer to form micro spherical cores;
c. the micro ball cores are sent into a balling disc, continuously roll in the balling disc, and are sprayed with water for the second time, so that the particle size of the micro ball cores is gradually increased to form an inner core 1, and the water content (weight) of the inner core 1 is 18-22%;
d. the inner core 1 enters a balling area of the balling disc, ordinary portland cement powder is uniformly scattered in the balling area, the inner core 1 rolls in the balling area, and a layer of ordinary portland cement shell 2 is uniformly coated by utilizing a water film with a thicker surface;
e. the balled material balls leave the balling disc for maintenance.
Before the step a is adopted, the fly ash is aired to enable the water content of the fly ash to be about 3%. The water content of gypsum is generally less than 1%, and especially when the industrial by-product salt gypsum is used as the sulfate excitant, the content of the sludge is less than 1% because the sludge content is high, so that the gypsum is washed by water in advance. Then spreading the mixture on a flat and clean flat ground to be dried in the sun or dried in a drying pit to ensure that the moisture content is less than 1 percent. The particle size of the salt gypsum is not large, but the salt gypsum is difficult to grind, the salt gypsum is easy to dehydrate and stick to balls during grinding, and a proper amount of quicklime is generally added during grinding.
When the water content of the ceramsite is more than 23%, the water film on the surface of the ceramsite is too thick and is bonded into a large cluster, and the particle size of the water film exceeds the particle size, so that the requirement of the particle composition of the ceramsite is not met; on the contrary, when the water content is less than 18 percent, the surface of the ceramsite has no water film, the particles are very small and loose, and the prepared ceramsite has almost no strength. Tests prove that when the water content of the ceramsite is 18-22%, the strength is high when the ceramsite is pelletized and discharged from a tray, and the gradation is reasonable.
The inclination angle of the balling disk is 46-48 degrees.
The material balls after the ball forming of the invention are naturally maintained under the condition that the temperature is higher than 10 ℃.
The material balls after balling are maintained for 28 days at the temperature of 10-24 ℃; curing for 15 days at a temperature of more than 24-35 ℃.
In the ceramsite disclosed by the invention, the content of the fly ash in the inner core 1 can be up to 90%. If the ceramsite is prepared into 1M3250 (c) of#The light aggregate reinforced concrete is made up by using ceramsite whose content is nearly 0.94M 3. If 20-35% of fly ash is doped into the concrete to replace cement, 100-150% of fly ash is prepared#The concrete is used to produce light aggregate concrete products such as hollow small building blocks, and the fly ash accounts for about 92 percent. If it is formulated 35#The sand-free large-hole building block is used as a filling wall of a frame structure, and the using amount of the fly ash accounts for about 96 percent. The ceramic material is produced and used from the aspects of treating industrial waste fly ash, saving energy, protecting environment and the likeHas obvious social and economic benefits. The proportion of the components of the inner core 1 of the ceramsite is reasonable, and the material cost is reduced on the premise of ensuring the performance requirement of the ceramsite. Particularly, the outer surface of the inner core 1 is coated with a layer of ordinary portland cement shell, so that various properties of the ceramsite are greatly improved. The invention has the advantages of light weight, heat preservation, sound insulation, shock resistance and the like. The following is the performance comparison of the ceramsite (for convenience, the cladding ceramsite) of the invention and the non-sintered fly ash ceramsite without the shell 2 (for convenience, the non-cladding ceramsite):
1. surface compactness:
observing on a Germany Isotz microscope by using a medium power microscope, and observing that the shell of the cladding ceramsite not only has crossed and longitudinal hydrated crystals but also has irregular amorphous hydrated colloid, so that the surface of the cladding ceramsite is compact and hard; the uncapsulated ceramsite has few surface hydrated crystals and almost no hydrocolloid, so the surface is loose.
2. Strength:
the components, the proportion and other conditions are the same, and the cylinder pressure strength of the cladded ceramsite is improved by 12-38 percent compared with that of the uncladded ceramsite.
3. Alkalinity:
A. after the encapsidated ceramsite and the uncapsulated ceramsite are naturally cured for 28 days, respectively weighing 300g of the encapsidated ceramsite and the uncapsulated ceramsite, respectively immersing the encapsidated ceramsite into the same amount of water, measuring the pH value of the encapsidated ceramsite at certain intervals, and expressing the results in a pH value table 1.
B, naturally curing theencapsidated ceramsite and the uncapsulated ceramsite for two months, respectively weighing 300g, partially carbonizing, and partially non-carbonizing, respectively placing the samples into rigid containers, self-grinding for a certain time (placing the samples into a ball-free porcelain mill, rotating the mill), then removing 0.5-2g of samples from the surface layer, and measuring the pH value by the method, wherein the results are shown in Table 2.
As can be seen from tables 1 and 2, the pH values measured were significantly higher for the jacketed ceramsite than for the uncased ceramsite, despite the different curing times and treatment methods.
4. Anti-carbonization ability:
the uncapped ceramsite is carbonized completely within 15 days, and the encaged ceramsite is carbonized completely only after one and a half years.
5. Wear resistance:
A. sieving the clad ceramsite and the unclad ceramsite, respectively putting 100g of the clad ceramsite and the unclad ceramsite with similar particle sizes into containers, rotating the containers for a certain time to drive the ceramisites to rub with each other and the ceramisites with the containers, pouring out the ceramisites after the certain time, sieving the powder with a sieve, weighing the powder, and calculating the wear-resistant loss percentage, wherein the wear-resistant loss of the clad ceramsite with the same proportion is 1.6-2.5 times lower than that of the unclad ceramisites.
B. And naturally curing the cladded ceramsite and the uncladded ceramsite for two months, carbonizing (artificially carbonizing), and performing a post-carbonization wear resistance test by the same method as the method A, wherein the wear resistance of the cladded ceramsite with the same proportion is 7.6-11.6 times higher than that of the uncladded ceramsite.
The contrast shows that the surface of the cladding ceramsite is compact and hard, and does not sand or peel after carbonization.
6. Durability:
A. carbonizing: the uncapsulated ceramsite is completely carbonized after being placed indoors for 15 days. The cladding porcelain granules which are stored in the open air for six months, nine months, one year and a half year are respectively checked by a phenolphthalein indicator to be red, which shows that the porcelain granules are not carbonized completely.
B, strength: the strength tests were carried out on the encrusted and uncapsulated ceramisites stored in the open air for 28 days, 6 months, 1 year and half, 2 years, respectively, and the results are shown in table 3. As shown in Table 3, the strength of the clad ceramsite gradually increased with the lapse of time within one year, and slightly decreased after one year. The strength of the uncapsulated ceramsite is greatly reduced after 28 days.
C. Freezing resistance: the freezing resistance of the clad ceramsite and the unclad ceramsite stored in the open air for 28 days, 6 months, 1 year and a half, and 2 years is respectively tested by the GB2838-81 standard method, and the result is shown in Table 3. As can be seen from Table 3, the weight loss of the encrusted ceramsite after 15 cycles is 3-4%, while the weight loss of the encrusted ceramsite is greater than 5%.
The method for manufacturing the non-sintered fly ash ceramsite not only reduces the manufacturing cost of the non-sintered fly ash ceramsite, but also ensures the reasonable gradation of the pellets, ensures the strength of the molded pellets, especially the initial strength of the pellets after the pellets are discharged from the disk, is favorable for bearing the impact, friction and extrusion in the conveying and maintenance processes, and protects the round and intact appearance of the non-sintered fly ash ceramsite.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The attached drawing is a structural schematic diagram of the non-sintered fly ash ceramsite.
As shown in the attached drawing, the non-sintered fly ash ceramsite of the invention consists of a spherical inner core 1 and a common portland cement outer shell 2 attached outside the inner core 1. The inner core 1 comprises the components of fly ash, ordinary portland cement, gypsum and YS-NF concrete admixture, and the following 3 examples are listed according to different proportions of the components:
example 1:
the composition (by weight) of the inner core 1 is: 90% of fly ash, 8% of ordinary portland cement, 1% of salt gypsum and 1% of YS-NF concrete additive. The above-mentioned all components are respectively weighed according to a certain proportion, and simultaneously fed into a ball mill with diameter of 1.2X 4.5m to make grinding, and the fineness of the mixed material is 10% (0.08mm square hole screen residue). The mixture is sent into a double-shaft mixer for mixing after being milled, a feed inlet of the mixer is provided with a 30 cm long water spray atomizer, atomized water enables the micro particles of the dry mixture powder to be wet, and a layer of uniform water film is coated to form small particles with uniform attached water. By atomizing water and stirring, the water content of water and materials is uniform under the microcosmic state, and the water and the mixture are uniformly wetted under the liquid-solid homogenization condition. In this step, the water content (weight) of the kneaded material is generally controlled to about 18% so that the wet kneaded material forms fine spherical nuclei in the twin-screw mixer. The micro ball cores are stirred and conveyed into a ball forming disc with the diameter of 2.2m by a double-shaft stirrer, the rotating speed of the ball forming disc is 13 revolutions per minute, and the inclination angle is 48 degrees. And after the micro ball cores are sent into the balling disc, spraying water for the second time, wherein the micro ball cores continuously roll in the balling disc, and the particle size is gradually increased to 8-10mm to form the inner core 1. The water content (weight) of the inner core 1 was 20%. Inner core 1Entering a balling area of the balling disc, and uniformly scattering ordinary silicate cement powder in the balling area. The inner core 1 rolls in the balling area, and a common Portland cement shell 2 with the thickness of 0.05-0.1mm is uniformly coated by utilizing a water film with a thicker surface. The balled material balls leave the balling disc and are maintained for 28 days at the natural temperature of 10-24 ℃. The cylinder pressure strength of the ceramsite of the example is 3.25MPa, and the bulk volume weight is 710kg/M3The water absorption was 19.0% and the freeze-thaw weight loss was 1.5%.
Example 2:
the implementation conditions of this example are the same as those of example 1, and the composition of the core 1 is (by weight): 88 percent of fly ash, 10 percent of ordinary portland cement, 1 percent of salt gypsum and 1 percent of YS-NF concrete admixture, the cylinder compressive strength of the ceramsite of the embodiment is 3.64MPa, and the bulk density is 715kg/M3The water absorption was 20.0% and the freeze-thaw weight loss was 1.0%.
Example 3:
the implementation conditions of this example are the same as those of example 1, and thecomposition of the core 1 is (by weight): 84% of fly ash, 13% of ordinary portland cement, 2% of salt gypsum and 1% of YS-NF concrete admixture. The cylinder pressure strength of the ceramsite of the example is 6.65MPa, and the bulk volume weight is 715kg/M3The water absorption rate is 21.7 percent, and the freeze-thaw weight loss is 1.0 percent
TABLE 1 pH value of the ceramsite
Test specimen Initial value Soaking for 3 hours Soaking for 6 hours Soaking for 8 hours Soaking for 24 hours
Uncased haydite 6.7 6.9 7.0 7.1 7.1
Ceramic particles with shell 6.9 7.0 7.2 7.3 7.4
TABLE 2 PH values before and after carbonization of the surface layer of the ceramsite
Test sample Before carbonization After carbonization
Uncased haydite 6.2 6.1
Ceramic particles with shell 7.2 7.2
TABLE 3 comparative test for the longevity of the ceramic granules
Figure A9710578800091

Claims (7)

1. Non-sintered flyash ceramicite for concrete, characterized in that it has a spherical core (1) and a shell (2) attached outside the core (1), wherein:
a. the composition (wt%) of the core (1) is:
84-90 fly ash
8-13 ordinary portland cement
1-2.2 Gypsum Fibrosum
1-1.2 concrete admixture
b. The shell (2) adopts ordinary portland cement
2. The non-sintered fly ash ceramsite according to claim 1, wherein the fineness of the mixture of the inner core (1) is 8-12% (0.08mm square mesh screen residue).
3. The non-sintered fly ash ceramsite according to claim 1 or 2, wherein the thickness of the outer shell (2) is 0.05-0.1 mm.
4. A method for producing the non-sintered fly ash ceramsite according to claim 1, 2 or 3, which comprises the steps of:
a. the raw materials of the fly ash, the ordinary portland cement, the gypsum and the concrete admixture of the inner core (1) are metered and simultaneously fed into a ball mill for mixing and grinding, and the fineness of the mixture is 8-12% (0.08mm square hole sieve allowance);
b. the milled mixture is sent into a stirrer to be stirred, atomized water is sprayed into the mixture, the water content (weight) of the mixture reaches 18%, and the wet mixture is stirred with the stirrer to form micro spherical cores;
c. the micro ball cores are sent into a balling disc, continuously roll in the balling disc, and are sprayed with water for the second time, so that the particle size of the micro ball cores is gradually increased to form the inner core (1), and the water content (weight) of the inner core (1) is 18-22%;
d. the inner core (1) enters a balling area of the balling disc, ordinary portland cement powder is uniformly scattered in the balling area, the inner core (1) rolls in the balling area, and a layer of ordinary portland cement shell (2) is uniformly coated by utilizing a water film with a thicker surface;
e. the balled material balls leave the balling disc for maintenance.
5. The method of claim 4 wherein the angle of inclination of the sphere is 46-48 degrees.
6. The method as claimed in claim 4, wherein the pelletized pellets are naturally cured at a temperature of more than 10 ℃.
7. The method as claimed in claim 6, wherein the pelletized pellets are cured for 28 days at a temperature of 10-24 ℃; curing for 15 days at a temperature of more than 24-35 ℃.
CN97105788A 1997-04-18 1997-04-18 Non-sintering powdered coal ash ceramic pellets and its prodn. method Pending CN1197050A (en)

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EP1700833A3 (en) * 2003-08-22 2006-10-11 Associacion de Investigacion de las Industrias de la Contruccion (AIDICO) Method of morphological design of pozzolanes to control the technical characteristics of the cements to which they are added
CN101913898A (en) * 2010-07-07 2010-12-15 苏州浩波科技股份有限公司 Process for manufacturing water treatment ceramsite filter by waste gypsum generated in acesulfame potassium production
CN101913898B (en) * 2010-07-07 2013-01-16 苏州浩波科技股份有限公司 Process for manufacturing water treatment ceramsite filter by waste gypsum generated in acesulfame potassium production
CN102092994A (en) * 2010-11-25 2011-06-15 大连恒翔粉煤灰综合利用有限公司 Fly ash sintering-free ceramsite
CN102219415A (en) * 2011-03-29 2011-10-19 河海大学 Light sand without burning and preparation method thereof
CN102219415B (en) * 2011-03-29 2013-07-03 河海大学 Light sand without burning and preparation method thereof
CN104529211A (en) * 2014-01-27 2015-04-22 郭金敏 Non-sintered cladded high-strength lightweight aggregate
CN104072049A (en) * 2014-07-15 2014-10-01 合肥良涂化工科技有限公司 Preparation method for concrete capable of suppressing release of soda residue chloride
CN107814503A (en) * 2017-10-26 2018-03-20 贵州中建建筑科研设计院有限公司 A kind of spacetabs type complex mineral blending material
CN110526609A (en) * 2019-08-31 2019-12-03 武汉理工大学 A kind of hud typed sulphoaluminate cement base high-strength light aggregate and preparation method thereof
CN111362633A (en) * 2020-03-16 2020-07-03 王亮 Heat-insulating alkali-resistant wall cement mortar
CN111362629A (en) * 2020-03-19 2020-07-03 深圳市纳路特建材科技有限公司 Alkali-proof, heat-insulating and wear-resistant wall cement mortar
CN111410500A (en) * 2020-04-28 2020-07-14 湖北昌耀新材料股份有限公司 Phosphogypsum ceramsite ball and spherical and gravel type phosphogypsum ceramsite ball light aggregate water stabilization layer
CN111410500B (en) * 2020-04-28 2022-03-01 湖北昌耀新材料股份有限公司 Phosphogypsum ceramsite ball and spherical and gravel type phosphogypsum ceramsite ball light aggregate water stabilization layer
CN112745071A (en) * 2020-12-30 2021-05-04 陕西正元环保科技产业(集团)有限公司 Preparation method of high-content high-strength fly ash unfired ceramsite
CN113072318A (en) * 2021-04-25 2021-07-06 湖北新洋丰新型建材科技有限公司 Spherical phosphogypsum and preparation method and application thereof
CN113200731A (en) * 2021-05-27 2021-08-03 中国十七冶集团有限公司 Solid waste base non-fired high-strength ceramsite and preparation method thereof
CN114920530A (en) * 2022-03-28 2022-08-19 佛山辰石环保材料有限公司 Sintering-free ceramsite and preparation method thereof

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