CN103803828A - Modified desulfurization ash for cement and concrete and preparation method thereof - Google Patents
Modified desulfurization ash for cement and concrete and preparation method thereof Download PDFInfo
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- CN103803828A CN103803828A CN201310726016.6A CN201310726016A CN103803828A CN 103803828 A CN103803828 A CN 103803828A CN 201310726016 A CN201310726016 A CN 201310726016A CN 103803828 A CN103803828 A CN 103803828A
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- concrete
- cement
- fly ash
- desulfurization ash
- desulphurize fly
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Abstract
The invention discloses modified desulfurization ash for cement and concrete and a preparation method of the modified desulfurization ash. The modified desulfurization ash for cement and concrete is prepared from desulfurization ash and an oxidizing agent through mixing at normal temperature, wherein the oxidizing agent comprises the following components by weight percentage: 70-80% of manganese dioxide, 5-10% of acetic acid and 10-25% of desulfuration residue, the conversion rate of CaSO4.2H2O in the modified desulfurization ash is 95-98%, the mixing amount of the modified desulfurization ash in cement and concrete is 5-25% (by weight percentage). The modified desulfurization ash has early compressive strength improved remarkably when being added into the cement and the concrete, has the compressive strength hardly reduced after being solidified completely, and has little swelling stress.
Description
Technical field
The invention belongs to concrete material technical field, be specifically related to a kind of low bulk modification desulphurize fly ash for cement and concrete and preparation method thereof.
Background technology
Dry desulfurization is mainly taked NID sulfur removal technology.NID technology is using unslaked lime or slaked lime as absorption agent, traps injecting reactor after the circulation flying dust humidification by mixing of gas with certain alkalescence that gets off with fly-ash separator, makes it to be distributed in equably in hot flue gas.Now, absorbent surface moisture is evaporated, and flue gas obtains cooling, but humidity increase, the SO in flue gas
2, the acidic components such as HCl are absorbed to generate CaSO
3.0.5H
2o and CaCl
2.4H
2o.By fly-ash separator trap the desulfurization end product that gets off and unreacted completely absorption agent again part inject humidification by mixing of gas device, and carry out recirculation after supplementary fresh absorbent, thereby greatly improved the utilization ratio of absorption agent.
Dry-process desulfurized ash is at present in concrete, because its sulphite content is up to 18.88%, cause later concrete volumetric expansion unstable, and the performance variation of dry-process desulfurized ash is large, foreign matter content and kind are also more, and especially sulphite content is higher and cannot use, and can only pile at present and abandon processing, cause the wasting of resources and secondary pollution, cannot be applied in so far in concrete.
CN201010546668.8 points out a kind of Quick Oxidation agent, but do not indicate transformation efficiency, through experimental results show that to have the oxidized aluminium of inferior sulfate radical high and cannot be applied to the defect of Cement industry, and not have the technology with regard to being specifically applied in Cement industry to do corresponding exploration.
In " the 5th national air contaminant treatment and desulphurization denitration (nitrogen), mercury, Carbon emission control, dedusting technology innovation conference " publication, " semi-wet flue gas desulfurizing ash comprehensive utilizating research " article is studied the desulphurize fly ash cement mixture processed that adds different ratios in cement clinker, result of study shows that semi-wet flue gas desulfurizing ash can be used to produce the raw material such as brick and cement mixture, but and undeclared concrete formula, product performance and using method.
Summary of the invention
The object of the invention is to provide a kind of modification desulphurize fly ash for cement and concrete, and its calcium sulfate transformation efficiency is high, mixes that early anti pressured intension is high after cement solidification moulding, rate of expansion is low.
For a modification desulphurize fly ash for cement and concrete, mix and make with oxygenant at normal temperatures by desulphurize fly ash, its oxidizer composition is Manganse Dioxide, acetic acid and desulfurization slag; CaSO in modification desulphurize fly ash
4.2H
2the transformation efficiency of O is 95-98%.
Press such scheme, described oxidizer composition is in mass ratio:
Manganse Dioxide 70-80wt%, acetic acid 5-10wt%, desulfurization slag 10-25wt%.
Press such scheme, in cement and concrete, the volume of modification desulphurize fly ash is counted 5%-25% by massfraction.
For a preparation method for the modification desulphurize fly ash of cement and concrete, comprise in desulphurize fly ash and add oxygenant, make CaSO
4.2H
2the transformation efficiency of O is 95-98%; Wherein oxidizer composition is Manganse Dioxide, acetic acid and desulfurization slag; Described oxidizer composition is in mass ratio: Manganse Dioxide 70-80wt%, acetic acid 5-10wt%, desulfurization slag 10-25wt%.
Whether qualified the depending primarily on of later concrete volume stability has enough large tensile strength, continue to react when concrete tensile strength is greater than remaining sulphite the volumetric expansion stress that changes into vitriol and produce, later concrete can not crack because remaining sulphite continues reaction.CaSO
4.2H
2the transformation efficiency of O is higher, and the interpolation of modification desulphurize fly ash is less to cement and concrete detrimentally affect.
Beneficial effect of the present invention:
CaSO in gained modification desulphurize fly ash
4.2H
2the transformation efficiency of O has reached 95-98%, adds in cement and concrete, and early anti pressured intension enlarges markedly, and after solidifying completely, ultimate compression strength does not almost reduce, and expansion stress is little.
Embodiment
Following examples are further explained technical scheme of the present invention, but not as limiting the scope of the invention.
The essential mineral of desulphurize fly ash consists of CaSO
3.0.5H
2o and CaCO
3, also have a small amount of Ca (OH)
2, and containing the flyash of glassy phase and mullite etc.More because of the lime adding when flue gas desulfurization, calcium sulfur ratio is higher, therefore CaCO
3more.
The preparation of oxygenant:
Moiety is in mass ratio: Manganse Dioxide 70-80wt%, acetic acid 5-10wt%, desulfurization slag 10-25wt%.
Be used for the preparation of the modification desulphurize fly ash of cement and concrete:
In desulphurize fly ash, add above-mentioned oxygenant, make CaSO
4.2H
2the transformation efficiency of O is 95-98%.CaSO
4.2H
2the transformation efficiency of O is in former desulphurize fly ash and is oxidized to CaSO
4.2H
2the CaSO of O
3.0.5H
2the ratio that O is shared.
In cement and concrete ash content (composition outside dewatering), the volume of modification desulphurize fly ash is controlled at 5%-25% by massfraction and makes cement concrete.
Above-mentioned experiment, CaSO in gained modification desulphurize fly ash
4.2H
2the transformation efficiency of O has reached 95-98%, adds in cement and concrete, and early anti pressured intension enlarges markedly, and after solidifying completely, ultimate compression strength does not almost reduce, and expansion stress is little.
Sample production:
Wherein numbering 1 is that embodiment, the numbering 3-7 that plain cement embodiment, numbering 2 are interpolation 50% breeze is respectively incorporating modified desulphurize fly ash 5wt%, 10wt%, 15wt%, 20wt%, the embodiment of 25wt%.
The impact of modification desulphurize fly ash on concrete strength: adopt identical water cement ratio, the modification desulphurize fly ash of different addition quantity is tested cement slurry intensity, the results are shown in Table 1.
Table 1
As can be seen from Table 1, along with the increase of desulphurize fly ash volume, the early anti pressured intension of hardened cement paste (3d and 7d) is improved, and within 28 days, intensity a little a little declines, but all reaches 42.5MPa basic demand.This is because in slurry, a large amount of CaCO in modification desulphurize fly ash
3and CaSO
42H
2o, can with C in cement clinker
3a reaction generates calcium trisulphoaluminate hydrate, has improved the early strength of hardened paste.But along with the increase of modification desulphurize fly ash, after place of cement and breeze, the clinker mineral ratio in system reduces, and has reduced the connection between particle, thereby has caused intensity slightly to decline.
Expansion stress detected result is as table 2:
Table 2
| Test specimen numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Tensile strength | 1.41 | 1.22 | 1.19 | 1.10 | 1.01 | 0.9 | 0.7 |
| Expansion stress | 0.24 | 0.23 | 0.47 | 0.54 | 0.80 | 0.66 | 0.57 |
| Stability | Qualified | Qualified | Qualified | Qualified | Qualified | Qualified | Qualified |
Remaining calcium sulfite in quantitative analysis concrete, estimates its issuable expansion stress, and measures concrete tensile strength, and relatively both sizes can be evaluated the long-term volume stability of concrete.Adopt expansion stress method to carry out stability detection to the concrete mortar of incorporating modified desulphurize fly ash, result shows that later concrete volume stability is qualified.
Claims (4)
1. for a modification desulphurize fly ash for cement and concrete, it is characterized in that being mixed and making with oxygenant at normal temperatures by desulphurize fly ash, its oxidizer composition is Manganse Dioxide, acetic acid and desulfurization slag; CaSO in modification desulphurize fly ash
4.2H
2the transformation efficiency of O is 95-98%.
2. as claimed in claim 1 for the modification desulphurize fly ash of cement and concrete, it is characterized in that described oxidizer composition is in mass ratio:
Manganse Dioxide 70-80wt%, acetic acid 5-10wt%, desulfurization slag 10-25wt%.
Described in claim 1 or 2 for the modification desulphurize fly ash of cement and concrete, it is characterized in that the volume of modification desulphurize fly ash in cement and concrete is counted 5%-25% by massfraction.
4. for a preparation method for the modification desulphurize fly ash of cement and concrete, comprise in desulphurize fly ash and add oxygenant, make CaSO
4.2H
2the transformation efficiency of O is 95-98%; Wherein oxidizer composition is Manganse Dioxide, acetic acid and desulfurization slag; Described oxidizer composition is in mass ratio: Manganse Dioxide 70-80wt%, acetic acid 5-10wt%, desulfurization slag 10-25wt%.
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|---|---|---|---|
| CN201310726016.6A CN103803828A (en) | 2013-12-25 | 2013-12-25 | Modified desulfurization ash for cement and concrete and preparation method thereof |
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|---|---|---|---|
| CN201310726016.6A CN103803828A (en) | 2013-12-25 | 2013-12-25 | Modified desulfurization ash for cement and concrete and preparation method thereof |
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Family
ID=50701275
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645452A (en) * | 2015-12-29 | 2016-06-08 | 武汉武新新型建材股份有限公司 | Desulfurization-residue asphalt anti-stripping agent, and preparation method and application of agent |
| CN105819480A (en) * | 2016-03-18 | 2016-08-03 | 株洲醴陵旗滨玻璃有限公司 | Semi-dry process flue gas desulfurized ash modification treatment method |
| CN108726940A (en) * | 2018-08-07 | 2018-11-02 | 安徽工业大学 | A kind of preparation method of Desulphurization concrete |
| CN110295010A (en) * | 2019-07-03 | 2019-10-01 | 安徽工业大学 | A kind of metallurgy solid waste type fireproof flame-retardant coating and preparation method thereof |
| CN110668722A (en) * | 2019-11-04 | 2020-01-10 | 安徽工业大学 | Oxidation-flame retardation-high shear force integrated solid waste inorganic adhesive and preparation method thereof |
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| CN101734875A (en) * | 2009-12-28 | 2010-06-16 | 华北电力大学（保定） | Method for catalytic oxidation of calcium sulfite in desulphurization ash by dry method and semi-dry method |
| CN102010146A (en) * | 2010-10-15 | 2011-04-13 | 中钢集团武汉安全环保研究院有限公司 | Method for modifying desulfuration ash for cement retarder |
| CN102464459A (en) * | 2010-11-12 | 2012-05-23 | 中国建筑材料科学研究总院 | Fast oxidizing agent for calcium sulfite in desulfurization gypsum and application of fast oxidizing agent |
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| CN1052260A (en) * | 1989-12-09 | 1991-06-19 | 成都环保建设工程技术设备公司 | The sulfur method of sulfur-containing smoke gas or tail gas |
| CN101244360A (en) * | 2007-11-26 | 2008-08-20 | 中电投远达环保工程有限公司 | Catalytic oxidation technique for calcium sulfite |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645452A (en) * | 2015-12-29 | 2016-06-08 | 武汉武新新型建材股份有限公司 | Desulfurization-residue asphalt anti-stripping agent, and preparation method and application of agent |
| CN105819480A (en) * | 2016-03-18 | 2016-08-03 | 株洲醴陵旗滨玻璃有限公司 | Semi-dry process flue gas desulfurized ash modification treatment method |
| CN108726940A (en) * | 2018-08-07 | 2018-11-02 | 安徽工业大学 | A kind of preparation method of Desulphurization concrete |
| CN110295010A (en) * | 2019-07-03 | 2019-10-01 | 安徽工业大学 | A kind of metallurgy solid waste type fireproof flame-retardant coating and preparation method thereof |
| CN110295010B (en) * | 2019-07-03 | 2021-07-30 | 安徽工业大学 | Metallurgical solid waste type fireproof flame-retardant coating and preparation method thereof |
| CN110668722A (en) * | 2019-11-04 | 2020-01-10 | 安徽工业大学 | Oxidation-flame retardation-high shear force integrated solid waste inorganic adhesive and preparation method thereof |
| CN110668722B (en) * | 2019-11-04 | 2021-05-28 | 安徽工业大学 | Oxidation-flame retardation-high shear force integrated solid waste inorganic adhesive and preparation method thereof |
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Application publication date: 20140521 |