CN104529207A - Method for preparing gypsum clinker by utilization of fly ash in circulating fluidized bed boiler - Google Patents
Method for preparing gypsum clinker by utilization of fly ash in circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN104529207A CN104529207A CN201410729660.3A CN201410729660A CN104529207A CN 104529207 A CN104529207 A CN 104529207A CN 201410729660 A CN201410729660 A CN 201410729660A CN 104529207 A CN104529207 A CN 104529207A
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- CN
- China
- Prior art keywords
- gypsum
- grog
- gypsum grog
- powder
- calcining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000010440 gypsum Substances 0.000 title claims abstract description 38
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 38
- 239000010881 fly ash Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001354 calcination Methods 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 230000032683 aging Effects 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000011505 plaster Substances 0.000 claims description 21
- 239000012530 fluid Substances 0.000 claims description 18
- 239000010883 coal ash Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000006227 byproduct Substances 0.000 claims description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000029087 digestion Effects 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract 1
- 238000006477 desulfuration reaction Methods 0.000 abstract 1
- 230000023556 desulfurization Effects 0.000 abstract 1
- 239000003546 flue gas Substances 0.000 abstract 1
- 238000000227 grinding Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 2
- 235000021321 essential mineral Nutrition 0.000 description 2
- 235000019739 Dicalciumphosphate Nutrition 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 1
- 229940038472 dicalcium phosphate Drugs 0.000 description 1
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- -1 setting accelerator Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for preparing gypsum clinker by the utilization of fly ash in a circulating fluidized bed boiler and is characterized in that the method comprises the following steps: a, adding 3-5 wt% of fly ash into flue gas desulfurization gypsum and uniformly mixing; b, calcining the above mixed materials in a rotary kiln; c, putting the calcined powder into a ball mill and grinding; and d, cooling the ground powder and aging to obtain the gypsum clinker. Then, fly ash can be effectively utilized, and strength of a gypsum board can be raised. Thus, production cost is greatly saved.
Description
Technical field
The present invention relates to a kind of coal ash for manufacturing that to utilize in circular fluid bed for the method for gypsum grog.
Background technology
The heat energy of gypsum board production line is from circular fluid bed, and circular fluid bed can produce a certain amount of flyash in operational process.
At present, flyash is used as rubbish directly to outwell, and so not only lavished labor on but also caused pollution to environment.Researched and analysed by the flyash produced circular fluid bed, find that flyash and material generation chemical reaction can generate the compound with hydraulic gelling property.
In the process of gypsum board manufacture, the intensity of plasterboard is also letter problem to be solved.
Summary of the invention
The technical problem to be solved in the present invention there is provided and a kind ofly utilizes coal ash for manufacturing in circular fluid bed for the method for gypsum grog, effectively can improve panel strength by flyash, thus greatly save production cost.
For solving the problems of the technologies described above, the invention provides and a kind ofly utilize coal ash for manufacturing in circular fluid bed for the method for gypsum grog, to comprise:
A. be that the flyash of 3%-5% adds in desulfurated plaster by mass percent, carry out Homogeneous phase mixing;
B. above-mentioned mixed material is calcined in rotary kiln;
C. the powder after calcining is put into ball mill levigate;
D. namely the powder cooling after levigate, ageing are obtained gypsum grog.
Preferably, terra alba CaSO4.2H2O content >=93% in described desulfurated plaster; Free-water <10%; PH value is 5 ~ 9.
Preferably, described flyash is the byproduct that circular fluid bed produces, and its chemical composition is by mass percentage: SiO21.30 ~ 65.76%; Al2O31.59 ~ 40.12%; Fe2O31.50 ~ 6.22%; CaO 1.44 ~ 16.80%; MgO 1.20 ~ 3.72%; SO31.00 ~ 6.00%; Na2O1.10 ~ 4.23%; K2O 1.02 ~ 2.1%; All the other are inevitable impurity.
Preferably, temperature during described calcining is set to 180 DEG C-200 DEG C, and humidity is set to 50rh-80rh.
Preferably, the time of described calcining is 1 hour to 1.5 hours.
Preferably, the powder after calcining is milled down to specific surface area by ball mill is 3500-4500m
2/ g.
Preferably, described levigate after powder want cooling temperature will be set to less than 60 DEG C.
Preferably, described digestion time is 12h-48h.
Preferably, when prepared by this gypsum grog, flyash accounts for the mass percent of desulfurated plaster is 3%-5%;
Preferably, this gypsum grog adopts following steps preparation:
1) flyash is added in desulfurated plaster, mix uniformly;
2) above-mentioned mixed material is calcined in rotary kiln;
3) powder after calcining is put into ball mill levigate;
4) namely the powder cooling after levigate, ageing are obtained gypsum grog.
Beneficial effect of the present invention is: be the flyash that with the addition of circular fluid bed generation in desulfurated plaster, the gypsum grog prepared, so just can improve panel strength, decrease the pollution to environment after the discharge of flyash simultaneously, there is obvious economic benefit and environmental benefit.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.
The present invention directly utilizes flyash and desulfurated plaster to make raw material, does not need to carry out any complicated technology such as purification, modification separately to each raw material, can reduce processing cost in early stage greatly, be conducive to the comprehensive utilization in large quantization, short distance footpath.
Of the present inventionly a kind ofly coal ash for manufacturing in circular fluid bed is utilized for the method for gypsum grog, to the steps include:
1. choose raw material, be that the flyash of 3%-5% adds in desulfurated plaster by mass percent, carry out Homogeneous phase mixing.
In this step, directly utilize desulfurated plaster for raw material.Wherein, terra alba CaSO4.2H2O content >=93% in desulfurated plaster; Free-water <10%; PH value is 5 ~ 9.
Flyash is the byproduct that circular fluid bed produces, and its chemical composition is by mass percentage: SiO21.30 ~ 65.76%; Al2O31.59 ~ 40.12%; Fe2O31.50 ~ 6.22%; CaO 1.44 ~ 16.80%; MgO 1.20 ~ 3.72%; SO31.00 ~ 6.00%; Na2O1.10 ~ 4.23%; K2O 1.02 ~ 2.1%; All the other are inevitable impurity.
2. above-mentioned mixed material is calcined in rotary kiln.Temperature during calcining is set to 180 DEG C-200 DEG C, and humidity is set to 50rh-80rh.The time of calcining is 1 hour to 1.5 hours.
3. the powder after calcining is put into ball mill levigate; It is 3500-4500m that material size after levigate will be reached specific surface area
2the standard of/g.
4. be arranged in the environment of less than 60 DEG C by the powder after levigate and cool, after cooling, the time of ageing 12h-48h, so just obtains gypsum grog.
Adopting the flyash that desulfurated plaster and circular fluid bed produce, is raw material, after batching, Homogeneous phase mixing, carry out calcining 80 minutes, then levigate in ball mill, and be 30 DEG C in temperature and cool, namely go out can the gypsum grog of intensity of reinforced plasterboard for ageing 12h-48h afterwards.
Gypsum grog is measured by belted electronic balance, and interpolation treated starch, setting accelerator, waste paper fibre, whipping agent and additive and water uniform stirring are mixed into slip, in conjunction with the extrusion molding of upper and lower mask paper, sending into drying machine afterwards, carrying out drying to sheet material through cutting off; After drying completes, trimming is packed, and namely obtains the plasterboard that ultimate compression strength is good.
Embodiment 1:
A kind of gypsum grog utilizing coal ash for manufacturing in circular fluid bed standby is specifically prepared burden add-on (mass percent): the flyash of 3% adds in desulfurated plaster, calcining temperature is 180 DEG C-200 DEG C, humidity is set to 50rh-80rh, and calcination time is 1 hour to 1.5 hours.
Embodiment 2:
A kind of gypsum grog utilizing coal ash for manufacturing in circular fluid bed standby is specifically prepared burden add-on (mass percent): the flyash of 4% adds in desulfurated plaster, calcining temperature is 180 DEG C-200 DEG C, humidity is set to 50rh-80rh, and calcination time is 1 hour to 1.5 hours.
Embodiment 3:
A kind of gypsum grog utilizing coal ash for manufacturing in circular fluid bed standby is specifically prepared burden add-on (mass percent): the flyash of 5% adds in desulfurated plaster, calcining temperature is 180 DEG C-200 DEG C, humidity is set to 50rh-80rh, and calcination time is 1 hour to 1.5 hours.
Embodiment result: utilize flyash to add the grog obtained after calcining in desulfurated plaster to the present invention, the essential mineral of discovery grog is calcium sulphoaluminate, Dicalcium Phosphate (Feed Grade), tetracalcium aluminoferrite, degree of crystallinity is good, and dissociant does not detect, shows that the burn-ability of grog is good.Use scanning electron microscope (SEM) to observe to grog, find that main mine phase calcium sulphoaluminate crystal grain assumes diamond in shape shape or tabular, crystalline form is grown complete, and average grain size about 8 μm, shows that the essential mineral in grog physically well develops.
Gained grog is allocated the blended materials such as gypsum into by " desulfurized plaster board: GB9775-2008 " national standard and is made the thick desulfurized plaster board of 9.5mm, and research desulfurated plaster correlation parameter, as shown in table 1, the intensity of plasterboard is apparently higher than national standard.
Table 1 is with adding the standby gypsum grog of coal ash for manufacturing, the correlated performance of the plasterboard produced.
Although the embodiment disclosed by invention as above, the embodiment that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Technician in any the technical field of the invention; under the prerequisite not departing from the spirit and scope disclosed by the present invention; any amendment and change can be done what implement in form and in details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (9)
1. utilize coal ash for manufacturing in circular fluid bed for a method for gypsum grog, to it is characterized in that, the method comprises the steps:
A. be that the flyash of 3%-5% adds in desulfurated plaster by mass percent, carry out Homogeneous phase mixing;
B. above-mentioned mixed material is calcined in rotary kiln;
C. the powder after calcining is put into ball mill levigate;
D. namely the powder cooling after levigate, ageing are obtained gypsum grog.
2. prepare the method for gypsum grog as claimed in claim 1, it is characterized in that: the terra alba CaSO4.2H in described desulfurated plaster
2o content>=93%; Free-water <10%; PH value is 5 ~ 9.
3. gypsum grog preparation method as claimed in claim 1, is characterized in that: described flyash is the byproduct that circular fluid bed produces, and its chemical composition is by mass percentage: SiO
21.30 ~ 65.76%; Al
2o
31.59 ~ 40.12%; Fe
2o
31.50 ~ 6.22%; CaO 1.44 ~ 16.80%; MgO1.20 ~ 3.72%; SO
31.00 ~ 6.00%; Na
2o1.10 ~ 4.23%; K
2o 1.02 ~ 2.1%; All the other are inevitable impurity.
4. prepare the method for gypsum grog as claimed in claim 1, it is characterized in that: temperature during described calcining is set to 180 DEG C-200 DEG C, and humidity is set to 50rh-80rh.
5. prepare the method for gypsum grog as claimed in claim 1, it is characterized in that: the time of described calcining is 1 hour to 1.5 hours.
6. prepare the method for gypsum grog as claimed in claim 1, it is characterized in that: it is 3500-4500m that the powder after calcining is milled down to specific surface area by ball mill
2/ g.
7. prepare the method for gypsum grog as claimed in claim 1, it is characterized in that: described levigate after powder want cooling temperature will be set to less than 60 DEG C.
8. prepare the method for gypsum grog as claimed in claim 1, it is characterized in that: described digestion time is 12h-48h.
9. utilize the gypsum grog that coal ash for manufacturing in circular fluid bed is standby, it is characterized in that: time prepared by this gypsum grog, flyash accounts for the mass percent of desulfurated plaster is 3%-5%;
This gypsum grog adopts following steps preparation:
1) flyash is added in desulfurated plaster, mix uniformly;
2) above-mentioned mixed material is calcined in rotary kiln;
3) powder after calcining is put into ball mill levigate;
4) namely the powder cooling after levigate, ageing are obtained gypsum grog.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729660.3A CN104529207A (en) | 2014-12-04 | 2014-12-04 | Method for preparing gypsum clinker by utilization of fly ash in circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729660.3A CN104529207A (en) | 2014-12-04 | 2014-12-04 | Method for preparing gypsum clinker by utilization of fly ash in circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104529207A true CN104529207A (en) | 2015-04-22 |
Family
ID=52844896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410729660.3A Pending CN104529207A (en) | 2014-12-04 | 2014-12-04 | Method for preparing gypsum clinker by utilization of fly ash in circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104529207A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548034A (en) * | 2020-06-19 | 2020-08-18 | 中山大学 | Auxiliary cementing material utilizing circulating fluidized bed fly ash and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05253559A (en) * | 1992-03-10 | 1993-10-05 | Toshiba Corp | Disposal of waste |
| DE10304772A1 (en) * | 2003-02-05 | 2004-08-26 | Mineral Plus Gmbh | Preparing molded articles from gypsum, useful in manufacture of cement, where the gypsum is derived from gas desulfurization units and is mixed with coal fly ash before compaction |
| CN101172798A (en) * | 2007-10-30 | 2008-05-07 | 中国水利水电第十四工程局 | Building gypsum and mineral additive, and method of manufacturing the same |
| CN102351447A (en) * | 2011-07-02 | 2012-02-15 | 河海大学 | Processing method for improving setting performance of desulfurized gypsum |
| CN103964714A (en) * | 2014-04-25 | 2014-08-06 | 河北联合大学 | Method for preparing high-performance gypsum-based composite cementing material by calcium sulfite type FGD (Flue Gas Desulfurization) gypsum |
-
2014
- 2014-12-04 CN CN201410729660.3A patent/CN104529207A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05253559A (en) * | 1992-03-10 | 1993-10-05 | Toshiba Corp | Disposal of waste |
| DE10304772A1 (en) * | 2003-02-05 | 2004-08-26 | Mineral Plus Gmbh | Preparing molded articles from gypsum, useful in manufacture of cement, where the gypsum is derived from gas desulfurization units and is mixed with coal fly ash before compaction |
| CN101172798A (en) * | 2007-10-30 | 2008-05-07 | 中国水利水电第十四工程局 | Building gypsum and mineral additive, and method of manufacturing the same |
| CN102351447A (en) * | 2011-07-02 | 2012-02-15 | 河海大学 | Processing method for improving setting performance of desulfurized gypsum |
| CN103964714A (en) * | 2014-04-25 | 2014-08-06 | 河北联合大学 | Method for preparing high-performance gypsum-based composite cementing material by calcium sulfite type FGD (Flue Gas Desulfurization) gypsum |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548034A (en) * | 2020-06-19 | 2020-08-18 | 中山大学 | Auxiliary cementing material utilizing circulating fluidized bed fly ash and preparation method thereof |
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| PB01 | Publication | ||
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Application publication date: 20150422 |