CN1911848A - Technology of sintering sulfur aluminate cement using desulfur ash - Google Patents
Technology of sintering sulfur aluminate cement using desulfur ash Download PDFInfo
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- CN1911848A CN1911848A CN 200610068783 CN200610068783A CN1911848A CN 1911848 A CN1911848 A CN 1911848A CN 200610068783 CN200610068783 CN 200610068783 CN 200610068783 A CN200610068783 A CN 200610068783A CN 1911848 A CN1911848 A CN 1911848A
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- fly ash
- cement
- desulphurize fly
- technology
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Abstract
The present invention is technological process of baking aluminosulfate cement with desulfurized ash, which has high sulfur and calcium contents and complicated components, as main material. The process converts desulfurized ash into aluminosulfate cement effectively, and needs the addition of no or small amount of bauxite and gypsum.
Description
Technical field
The present invention relates to a kind of firing technology of aluminosulfate cement, particularly make the technology of one of main component sintering sulfur aluminate cement with the desulphurize fly ash of coal-burning power plant.
Background technology
Aluminosulfate cement is a new cement series, is known as Tr row cement.Aluminosulfate cement is raw materials for production with Wingdale, alumina and gypsum, forms through 1300～1350 ℃ of low temperature calcinations, and the essential mineral of grog is calcium sulphoaluminate (3CaO3Al
2O
3CaSO
4) and Dicalcium Phosphate (Feed Grade) (2CaOSiO
2).It is fast that calcium sulphoaluminate has aquation, and sclerosis is fast, and the characteristics that heat release is concentrated are a kind of morning of strong mineral, are the main sources of aluminosulfate cement early strength; Cooperation is slow with aquation, and later strength is promoted big Dicalcium Phosphate (Feed Grade), thereby makes aluminosulfate cement have early strength and later strength preferably.This kind cement is different from other kind cement with the mineral composition of its grog, constitutes fundamental characteristics such as its early strong, high-strength, high impervious, high anti-freezing, corrosion-resistant and low alkalinity thus, and can in very large range adjust its expansion character.Because its good performance and low temperature calcination condition, aluminosulfate cement is being subjected to the extensive concern of countries in the world.
Require the Al of alumina in the raw materials for production of aluminosulfate cement
2O
3Content is greater than 55%, and high-quality alumina resource-constrained, and be the main raw material of aluminium metallurgy, therefore limited the production and the application of aluminosulfate cement to a certain extent.
Along with the power plant desulfurization technology, particularly use the various dry desulfurizing process of calcium-based desulfurizing agent, as in-furnace calcium spraying sulfur removal technology, fluidized-bed combustion sulfur removal technology etc., with the applying of semi-dry desulfurizing process that with the spraying drying is feature, the disposal of desulfurization ash with utilize problem to arise at the historic moment, become one of desulfurization technology difficult problem in using.
Desulfurization ash is desulfurization product and common cindery mixture.Compare with ordinary fly ash, the chemical ingredients of desulfurization ash and mineral composition difference are very big.The all general flyash of the content of sulphur and calcium constituent is high a lot of in the chemical constitution of desulphurize fly ash, and also more complicated of the mineral forms of these two kinds of elements.Common in the dry desulfurizing process of in-furnace calcium spraying, the mutually existing CaSO of sulfur-bearing thing in the desulfurization product
4CaSO is also arranged
3, some free CaO of complete reaction not in addition.And in spray-dired semidrying low-temp desulfurization technology, the sulfur-bearing thing in the desulfurization product is mutually then with CaSO
3Be main, CaSO
4Content seldom; The calcium constituent of complete reaction is not generally with Ca (OH)
2Form exist; And because a large amount of CO in the flue gas
2Existence, CaCO in the time of desulfurization
3Generation often also inevitable.
For general utilization of coal ash,, developed in a lot of fields at present through studying for a long period of time of a lot of people.Main to utilize mode to have following several: (1) makes building resource: as make cement mixture, make concrete admixture, and make building block or as the use of brick and tile material etc.; (2) pave the way, fill: as make ground surface material or return and to bury mine; (3) being applied to agricultural carries out soil improvement or produces chemical fertilizer; (4) reclaim useful matter, as glass microballon and metal and compound thereof etc.Wherein use as building resource is the most important mode of utilizing of flyash always.
Yet the composition characteristic of desulfurization ash has limited its utilization in the flyash traditional field greatly.At first, making mixed material of cement or concrete admixture is one of approach of flyash utilization maximum originally, yet, excessive sulfur content can not can only quite lack desulphurize fly ash again as mixed material use of cement or addition content as ordinary fly ash is direct, because in the national standard of Portland cement, stipulate, SO in the cement
3Content can not surpass 3.5%.Secondly, solidify the sulphur in calcium sulfite,, also might make SO if utilization is unreasonable
2Discharge, cause secondary pollution, all that has been achieved is spoiled to make sulfur removal technology, for example at high temperature produces the brick and tile material with desulphurize fly ash and will cause this phenomenon.Have again, when free calcium oxide content is high in the desulphurize fly ash, then can in long-term hydration process, constantly generate Ca (OH)
2, volume constantly expands, and then in use causes the bad problem of stability, so this also is the obstacle that desulphurize fly ash is utilized at building materials field.
The research and development of carrying out at the desulphurize fly ash characteristic mainly are as cement setting retarder specially.CaSO
4Really have delayed coagulation, but CaSO
3Whether have delayed coagulation disagreement is still arranged at present.Even desulphurize fly ash can be used as cement setting retarder really and uses, with respect to desulphurize fly ash googol amount and, its utilization also is very little.
In view of above reason, at present a large amount of desulphurize fly ash, have only small part to obtain primary utilization, the overwhelming majority is abandoned, and has not only destroyed environment but also land occupation, also directly affects the application and the popularization of flue gas desulfurization technique.
Summary of the invention
The present invention is directed to the characteristic that desulphurize fly ash high sulfur and calcium contents complicated component is difficult to utilize, the restricted problem of raw material in the combined sulfur aluminate cement production process has proposed to do with desulphurize fly ash the technology of one of main component sintering sulfur aluminate cement.
Make raw material with desulphurize fly ash and produce aluminosulfate cement, contain the source that sulfur mineral just in time can be used as required element sulphur in the cement clinker in the desulphurize fly ash, can realize the curing of element sulphur and make full use of, can not use or only use a small amount of gypsum when the aluminosulfate cement batching is produced.Producing cement all needs a large amount of CaO, is raw material usually with the Wingdale, and the free CaO in the desulphurize fly ash, Ca (OH)
2And CaCO
3Can be directly as the source of required CaO, a part of Wingdale during the replacement sulfur aluminate cement is prepared burden.Flyash part in the desulphurize fly ash then can be used as SiO in the aluminosulfate cement
2And Al
2O
3The source.In addition, common all some residual carbon that does not burn in the lime-ash are made raw material with desulphurize fly ash and then can be made its further burning in the high temperature sintering process, are fully used.
The present invention does not need to change general Cement Production equipment and production technique, only need carry out the adjustment of raw meal proportioning.Raw meal proportioning precentagewise of the present invention is: desulphurize fly ash 30～45%, Wingdale 55～65%, gypsum 0～15%.Desulphurize fly ash that produces with coal desulfurization and Wingdale and gypsum are raw material, through behind the grinding, calcine in kiln.
It is 1300～1350 ℃ that the present invention requires the firing range of grog.
The present invention requires the firing time of grog in 10～30 minutes.
The essential mineral composition of the cement clinker that the present invention burnt till is calcium sulphoaluminate (3CaO3Al
2O
3CaSO
4) and Dicalcium Phosphate (Feed Grade) (2CaOSiO
2).
The present invention is according to above-mentioned batching scope, and the sulphoaluminate cement clinker that is burnt till under said temperature control passes through compressive strength test, and ultimate compression strength can reach 21Mpa in 3 days, and ultimate compression strength can reach 42.5Mpa in 28 days.
Summarize describedly, the present invention makes main raw material production aluminosulfate cement with desulphurize fly ash, can not be subjected to the restriction of the characteristics of desulphurize fly ash complicated component and high sulfur and calcium contents fully, and can efficiently utilize its various compositions, can realize making the best use of everything; Simultaneously, the present invention also can overcome the restriction that aluminosulfate cement production is subjected to raw material such as alumina etc., can need not alumina, need not or only needs a small amount of gypsum, just can realize manufacture of cement.
Description of drawings
The X ray diffracting spectrum of the sulphoaluminate cement clinker that accompanying drawing 1 burns till for preparing burden with desulphurize fly ash 36.2%, Wingdale 61.8%, gypsum 2%.
The X ray diffracting spectrum of the sulphoaluminate cement clinker that accompanying drawing 2 burns till for preparing burden with desulphurize fly ash 34.3%, Wingdale 53.4%, gypsum 12.3%.Wherein, A is a calcium sulphoaluminate, and B is a Dicalcium Phosphate (Feed Grade).
Embodiment
Example 1: prepare burden by desulphurize fly ash, Wingdale and gypsum per-cent, desulphurize fly ash 36.2%, Wingdale 61.8%, gypsum 2%, wherein the main component of desulphurize fly ash consists of: SiO
243.7%, Al
2O
324.8%, Fe
2O
34.1%, CaO11.8%, SO
37.5%.Calcining temperature is 1300 ℃, and calcination time is 30 minutes.Products obtained therefrom is through compressive strength test, and 3 days and 28 days ultimate compression strength are respectively 27.6Mpa and 48.5Mpa.
Example 2: prepare burden by desulphurize fly ash, Wingdale and gypsum per-cent, desulphurize fly ash 34.3%, Wingdale 53.4%, gypsum 12.3%, wherein the main component of desulphurize fly ash consists of: SiO
248.7%, Al
2O
331.8%, Fe
2O
36.1%, CaO2.8%, SO
31.5%.Calcination condition is identical with precedent.Products obtained therefrom is through compressive strength test, and 3 days and 28 days ultimate compression strength are respectively 25.6Mpa and 47.9Mpa.
Example 3: prepare burden by desulphurize fly ash, Wingdale and gypsum per-cent, desulphurize fly ash 44.8%, Wingdale 55.2%, gypsum 0%, wherein the main component of desulphurize fly ash consists of: SiO
238.7%, Al
2O
322.8%, Fe
2O
33.9%, CaO17.8%, SO
39.5%.Calcination condition is identical with precedent.Products obtained therefrom is through compressive strength test, and 3 days and 28 days ultimate compression strength are respectively 27.3Mpa and 49.5Mpa.
Claims (2)
1. Technology of utilizing the desulphurize fly ash sintering sulfur aluminate cement, it is characterized in that: desulphurize fly ash that produces with coal desulfurization and Wingdale and gypsum are raw material, through behind the grinding, calcine in kiln, firing temperature is 1300～1350 ℃, and calcination time is 10～30 minutes.
2. the technology with the desulphurize fly ash sintering sulfur aluminate cement according to claim 1 is characterized in that: the batching of this aluminosulfate cement is, desulphurize fly ash accounts for 30～45%, and Wingdale accounts for 55～65%, and gypsum accounts for 0～15%.
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| CNB2006100687832A CN100396635C (en) | 2006-09-11 | 2006-09-11 | Technology of sintering sulfur aluminate cement using desulfur ash |
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|---|---|---|---|
| CNB2006100687832A CN100396635C (en) | 2006-09-11 | 2006-09-11 | Technology of sintering sulfur aluminate cement using desulfur ash |
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| CN1911848A true CN1911848A (en) | 2007-02-14 |
| CN100396635C CN100396635C (en) | 2008-06-25 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182153B (en) * | 2007-11-08 | 2010-06-16 | 滕少波 | Waste slag treatment method for petroleum scraps burning desulfurization |
| CN101935173A (en) * | 2010-08-11 | 2011-01-05 | 山东大学 | Method for producing cement by using low-grade fly ash and desulfurization byproduct |
| CN104446049A (en) * | 2014-12-19 | 2015-03-25 | 青岛理工大学 | Sulfate aluminum cement taking petroleum coke desulfurization residues as raw materials and preparation method of sulfate aluminum cement taking petroleum coke desulfurization residues as raw materials |
| CN105517971A (en) * | 2013-04-30 | 2016-04-20 | 海湾研究与发展组织 | A method for producing cement |
| CN105683121A (en) * | 2013-09-03 | 2016-06-15 | 海德堡水泥公司 | Fluxes/mineralizers for calcium sulfoaluminate cements |
| CN110563359A (en) * | 2019-07-16 | 2019-12-13 | 中机国能电力工程有限公司 | Method for preparing sulphoaluminate cement clinker by using high-calcium fly ash and finished product components thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2198892B (en) * | 1986-12-11 | 1990-11-28 | Johnson Electric Ind Mfg | Armature winding connections. |
| CN1061951C (en) * | 1997-01-08 | 2001-02-14 | 中国建筑材料科学研究院水泥所阳泉联营特种水泥厂 | Super high strength quick hardening sulfaluminous cement |
-
2006
- 2006-09-11 CN CNB2006100687832A patent/CN100396635C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182153B (en) * | 2007-11-08 | 2010-06-16 | 滕少波 | Waste slag treatment method for petroleum scraps burning desulfurization |
| CN101935173A (en) * | 2010-08-11 | 2011-01-05 | 山东大学 | Method for producing cement by using low-grade fly ash and desulfurization byproduct |
| CN105517971A (en) * | 2013-04-30 | 2016-04-20 | 海湾研究与发展组织 | A method for producing cement |
| CN105683121A (en) * | 2013-09-03 | 2016-06-15 | 海德堡水泥公司 | Fluxes/mineralizers for calcium sulfoaluminate cements |
| AU2014317427B2 (en) * | 2013-09-03 | 2017-03-30 | Heidelbergcement Ag | Fluxes/mineralizers for calcium sulfoaluminate cements |
| CN105683121B (en) * | 2013-09-03 | 2018-04-06 | 海德堡水泥公司 | Flux/mineralizer for calcium sulphoaluminate cement |
| CN104446049A (en) * | 2014-12-19 | 2015-03-25 | 青岛理工大学 | Sulfate aluminum cement taking petroleum coke desulfurization residues as raw materials and preparation method of sulfate aluminum cement taking petroleum coke desulfurization residues as raw materials |
| CN110563359A (en) * | 2019-07-16 | 2019-12-13 | 中机国能电力工程有限公司 | Method for preparing sulphoaluminate cement clinker by using high-calcium fly ash and finished product components thereof |
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|---|---|
| CN100396635C (en) | 2008-06-25 |
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