CN110272285A - A kind of high-calcium fly ass high-strength ceramic granule and preparation method thereof - Google Patents
A kind of high-calcium fly ass high-strength ceramic granule and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to haydite and field of solid waste disposal, and in particular to a kind of high-calcium fly ass high-strength ceramic granule and preparation method thereof.The present invention, without using other additives as binder, controls the moisture in raw material using high-calcium fly ass as raw material, generates viscosity using the self-hardening property of high-calcium fly ass, is granulated in former disk pelletizer, the utilization rate of flyash is made to reach 100%.Meanwhile preparation method of the present invention utilizes the self-hardening property of high-calcium fly ass, without using other additives as binder, simple production process, low cost, yield is high and haydite intensity is high-strength, has significant economic benefit and value.
Description
Technical field
The present invention relates to haydite and field of solid waste disposal, and in particular to a kind of high-calcium fly ass high-strength ceramic granule and its preparation side
Method.
Background technique
With the fast development of power industry, coal-burning power plant increases the consumption of coal year by year, and the discharge amount of flyash is total
Amount also increases year by year.A large amount of flyash can generate fugitive dust without processing, pollute atmospheric environment.If being discharged into river system, can block up
River is filled in, polluted underground water source generates harm to human health.
Haydite is that one kind using inorganic material such as silica, aluminium oxide as primary raw material, through granulation, high-temperature roasting production is light
Gather materials.Haydite outer surface has hard waterproof glaze layer shell, and inside has closed microcellular structure.Not according to haydite function
It is same to can be used as substituting stone aggregate chips in construction material as light-weight aggregate；It is used as water treatment filter material in water treatment field；In gardens row
Industry is used as the matrix of soilless cultivation.
Although being required to match in current production technology currently, flyash, which has been disclosed, can be used for haydite production
It closes the raw materials such as other binders, fluxing agent, foaming agent, reinforcing agent and is just able to achieve the performances such as the high-strength light of haydite, with money
The continuous consumption in source, the high energy consumption of haydite production, haydite production cost are high in addition.
In these cases, inventor conducts in-depth research flyash, it is found that current many coal-burning power plant's (examples
If circulating fluidized bed boiler uses desulfuration in furnace technique, using lime stone as desulfurizing agent, the generation of CaCO calcining and decomposing and coal in burner hearth
Carbonate decomposition makes fly ash calcium content higher in combustion process；There are also part power plant can in fuel mixing portion industry
Solid waste causes calcium content after burning higher etc.) the fly ash calcium content that generates is higher, on this basis, inventors have found that this
Class flyash passes through certain processing technology, does not need other auxiliary agents and is prepared into the high-strength ceramic granule haveing excellent performance.Which energy
The production cost of lytag is enough substantially reduced, utilization of fly ash value is improved, is conducive to the protection of ecological environment, realizes
The reasonable utilization of resource.
Summary of the invention
In order to achieve the above object, production only do not added using flyash as raw material any binder, fluxing agent, foaming agent,
The high-strength ceramic granule of the auxiliary agents such as reinforcing agent improves the utilization rate and added value of flyash while reducing haydite production cost.
Technical scheme is as follows:
A kind of high-calcium fly ass high-strength ceramic granule, raw material are high-calcium fly ass, CaO content 11-13%；
Preferably, SiO in the high-calcium fly ass2Content is 43-46%, Al2O3Content is 30-35%, Fe2O3Content is
2-4%, TiO2Content is 0.5-2%.Heretofore described content is mass percent.
More preferably, the high-calcium fly ass is not more than 12% through 325 mesh square hole screen screen over-sizes；The partial size of haydite is 5
~15mm.
The haydite preparation method, specific steps are as follows: high-calcium fly ass is mixed with water, is granulated into pelletizer,
High-strength ceramic granule is obtained through drying, preheating, sintering, cooling again；
Wherein, high-calcium fly ass mixes 3~5min with water；Mixed material moisture content is 12~18% or so；
The drying temperature is 180~250 DEG C, and the time is 60~90min；
The preheating temperature is 500~700 DEG C, and the time is 15~25min；Guarantee sufficient mass transport process inside haydite.
The sintering temperature is 1200~1260 DEG C, and the time is 20~30min；This stepwise heating temperature is too low, and haydite is owed
It burns, intensity is low, and heating temperature is excessively high, and haydite burning, haydite is easy to be adhered.
It is described to be cooled to natural cooling；
The primary chemical of ordinary fly ash forms are as follows: SiO2、AlO3、FeO、Fe2O3、CaO、TiO2Deng, wherein CaO content
Between 1%-4%.High-calcium fly ass CaO content is between 11%-13% in the present invention；High-calcium fly ass is due to containing a large amount of
Silicon, the aluminium component of glassy state have very strong pozzolanic reaction activity, along in flyash containing the CaO of 11%-13%,
So flyash and water mixing, just form hydrated calcium silicate gel (CSH) product in fine coal gray surface, to bond instead of haydite
Agent and other auxiliary agents, enable haydite raw material ball to form, and have preferable intensity, meet the high-strength fly-ash pottery of national standard mark
The requirement of grain, compared with ordinary fly ash high-strength ceramic granule, with simple production process, production cost is low, cylindrical compress strength is high, resistance to
The advantages that fiery, can further apply the fields such as construction material, road pavement, sewage treatment, such as can be used as concrete
Coarse aggregate is used to prepare haydite concrete, or for being laid with haydite anti-skid surface, or as filtrate processing sewage.
Technical solution provided by the invention has the advantages that
(1) in the present invention, viscosity is generated using the self-hardening property of high-calcium fly ass, without using other additives as bonding
Agent reduces production cost；
(2) in the present invention, the utilization rate of flyash reaches absolutely, improves the utilization rate of flyash；
(3) in the present invention, the haydite of preparation is high-strength ceramic granule, can be applied to construction material, sewage treatment, road pavement etc.
Field.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution in the embodiment of the present invention describes with carrying out clear, completion.
Described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the implementation in the present invention
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The scope of protection of the invention.
Embodiment 1
3000g high-calcium fly ass is weighed, high-calcium fly ass used is generated from coal-burning power plant by desulfurizing agent of lime stone
Circulating sulfuration bed coal ash, main chemical compositions are following (in terms of mass content percentage): silica (SiO2)
44.1%, aluminum oxide (Al2O3) 33.6%, di-iron trioxide (Fe2O3) 3.2%, calcium oxide (CaO) 12.2, potassium oxide
(K2O) 0.7%, titanium dioxide (TiO2) 1.8%, high-strength ceramic granule is then prepared by the following method:
450g water is added in high-calcium fly ass, stirs 4min, obtains the mixed material of moisture content 15%, then will obtain
Raw material be granulated in former disk pelletizer, raw material ball partial size is in 10~15mm；
Obtained particle is put into high temperature furnace, then 80min is heated under the conditions of 200 DEG C, then heats to 600 DEG C,
20min is heated, then heats to 1250 DEG C, continues to heat 15min；
Last natural cooling obtains high strength and low cost lytag.
Embodiment 2
3000g high-calcium fly ass is weighed, what high-calcium fly ass used was generated using lime as desulfurizing agent from coal-burning power plant
Circulating sulfuration bed coal ash, main chemical compositions are following (in terms of mass content percentage): silica (SiO2) 43.1%,
Aluminum oxide (Al2O3) 34.0%, di-iron trioxide (Fe2O3) 2.4%, calcium oxide (CaO) 12.8, potassium oxide (K2O)
0.9%, titanium dioxide (TiO2) 1.1%, the then high strength and low cost lytag of preparating example 2 by the following method:
450g water is added in high-calcium fly ass, stirs 4min, obtains the mixed material of moisture content 15%, then will obtain
Raw material be granulated in former disk pelletizer, raw material ball partial size is in 10~15mm；
Obtained particle is put into high temperature furnace, then 80min is heated under the conditions of 220 DEG C, then heats to 650 DEG C,
20min is heated, then heats to 1230 DEG C, continues to heat 15min；
Last natural cooling obtains high strength and low cost lytag.
Embodiment 3
3000g high-calcium fly ass is weighed, high-calcium fly ass used is de- with carbide slag and its clear liquid from coal-burning power plant
The circulating fluid bed coal ash that sulphur agent generates, main chemical compositions are following (in terms of mass content percentage): silica
(SiO2) 45.8%, aluminum oxide (Al2O3) 35.0%, di-iron trioxide (Fe2O3) 3.7%, calcium oxide (CaO) 11.2, oxygen
Change potassium (K2O) 0.4%, titanium dioxide (TiO2) 0.5%, the then high strength and low cost flyash of preparating example 2 by the following method
Haydite:
450g water is added in high-calcium fly ass, stirs 4min, obtains the mixed material of moisture content 15%, then will obtain
Raw material be granulated in former disk pelletizer, raw material ball partial size is in 5~15mm；
Obtained particle is put into high temperature furnace, then 80min is heated under the conditions of 180 DEG C, then heats to 680 DEG C,
20min is heated, then heats to 1260 DEG C, continues to heat 15min；
Last natural cooling obtains high strength and low cost lytag.
The lytag respectively prepared by example 1~3 carries out performance detection, as a result as shown in the table:
By upper test result it is found that lytag prepared by the present invention has the low and excellent strength characteristics of water absorption rate,
It is used to prepare in haydite concrete and road surfacing engineering especially as construction material.
Claims (9)
1. a kind of high-calcium fly ass high-strength ceramic granule, which is characterized in that its raw material is high-calcium fly ass, CaO content 11-
13%.
2. a kind of high-calcium fly ass high-strength ceramic granule according to claim 1, which is characterized in that in the high-calcium fly ass
SiO2Content is 43-46%, Al2O3Content is 30-35%, Fe2O3Content is 2-4%, TiO2Content is 0.5-2%.
3. a kind of high-calcium fly ass high-strength ceramic granule according to claim 1, which is characterized in that the high-calcium fly ass warp
325 mesh square hole screen screen over-sizes are not more than 12%.
4. a kind of high-calcium fly ass high-strength ceramic granule according to claim 1, which is characterized in that the partial size of the haydite is 5
~15mm.
5. a kind of preparation method of high-calcium fly ass high-strength ceramic granule, specific steps include mixing high-calcium fly ass with water, enter
Pelletizer is granulated, then through drying, preheating, sintering, cooling, which is characterized in that and the preheating temperature is 500~700 DEG C, when
Between be 15~25min；The sintering temperature is 1200~1260 DEG C, and the time is 20~30min.
6. a kind of preparation method of high-calcium fly ass high-strength ceramic granule according to claim 5, which is characterized in that high calcium fine coal
Material water ratio is 12~18% after ash is mixed with water.
7. a kind of preparation method of high-calcium fly ass high-strength ceramic granule according to claim 5, which is characterized in that the drying
Temperature is 180~250 DEG C, and the time is 60~90min.
8. a kind of preparation method of high-calcium fly ass high-strength ceramic granule according to claim 5, which is characterized in that the granulation
Partial size be 5~15mm.
9. a kind of preparation method of high-calcium fly ass high-strength ceramic granule according to claim 5, described to be cooled to natural cooling.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112246214A (en) * | 2020-06-29 | 2021-01-22 | 河北工业大学 | Preparation method and application of phosphorus-removing ceramsite in wastewater |
| CN114230362A (en) * | 2022-01-24 | 2022-03-25 | 太原理工大学 | Preparation method of high-efficiency water-absorbing ceramsite |
| CN114368939A (en) * | 2022-01-29 | 2022-04-19 | 陕西正元实业有限公司 | Fly ash-based artificial aggregate and preparation method thereof |
| CN114751722A (en) * | 2022-04-27 | 2022-07-15 | 大唐同舟科技有限公司 | Method for preparing ceramsite filter material by synergistic utilization of solid waste |
| CN115536364A (en) * | 2022-10-25 | 2022-12-30 | 昆明理工大学 | Method for preparing ceramic material by exciting copper tailings and fly ash through calcium oxide activity, and ceramic material |
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