CN102503196A - Method for preparing cement clinker by using waste concrete - Google Patents
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- CN102503196A CN102503196A CN2011103074075A CN201110307407A CN102503196A CN 102503196 A CN102503196 A CN 102503196A CN 2011103074075 A CN2011103074075 A CN 2011103074075A CN 201110307407 A CN201110307407 A CN 201110307407A CN 102503196 A CN102503196 A CN 102503196A
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Abstract
A method for preparing cement clinker by using waste concrete is disclosed, which comprises the following steps: collecting, drying and breaking waste concrete, selecting concrete particles with a particle size of 5mm-20mm, adding iron powder or sulfuric acid dregs into the concrete particles, mixing and grinding the mixture, and screening cement raw material powders by use of a square hole screen (80mum) with screen residue being 8%-16%, wherein if the iron powder is added, the mass percent of the concrete is 98.5%-99.5% and the mass percent of the iron powder is 0.5%-1.5%; and if the sulfuric acid dregs are added, the mass percent of the concrete is 95.0%-96.0% and the mass percent of the sulfuric acid dregs is 4.0%-5.0%; and finally balling, calcining and quenching the concrete so as to obtain the cement clinker. According to the method, the mass percent of the waste concrete in the cement clinker is more than 95%, the quality of the cement clinker is equivalent to that of the common cement clinker, and the cement clinker can be taken as raw material to be applied to the concrete preparation, so that a good utilization approach is found for reutilization of the waste concrete.
Description
Technical field
The present invention relates to the preparation method of cement clinker, especially utilize discarded concrete to prepare the method for cement clinker.
Background technology
Along with the development of national economy and construction industry, annual because of removing the discarded concrete enormous amount that old building produces, if to these discarded concretes landfill simply only, cause undoubtedly to the severe contamination of environment with to the huge waste of the energy.How to handle the great attention that these discarded concretes have caused building trade and environmental administration.Discarded concrete is a kind of concrete that has hardened; Mainly gather materials etc. and form by hydrated cement paste (cement stone), sandstone; Wherein sandstone gathers materials and accounts for 70%～80%; To the recovery and utilization technology of discarded concrete is exactly whole or a certain separation component and unfolded around it, and up to the present, the research that discarded concrete utilizes again mainly contains following three kinds of technology types:
1. process regenerated aggregate and prepare regeneration concrete, be about to discarded concrete and be used respectively through broken, screening acquisition recycled coarse aggregate, recycled fine aggregate and powder.If discarded concrete is a boulder concrete, the recycled coarse aggregate better performances that then obtains; Compare with boulder concrete; The broken apart particle diameter that goes out of crushed stone concrete contains a large amount of hydrated cement pastes at the coarse particles of coarse aggregate scope, and water-intake rate is high, suction is fast, and crush index is big; Young's modulus is low; When using as recycled coarse aggregate, it is low or than minor position, like place mat roadbed or basic backfill etc. to be used for requirement of strength.And no matter be boulder concrete, or crushed stone concrete, because of containing a large amount of hydrated cement pastes, water-intake rate is very high, is difficult to use as recycled fine aggregate at the fine particle of fine aggregate scope for its broken apart particle diameter that goes out.
2. isolate the cement stone in the discarded concrete, the preparation regenerative gel material is about to discarded concrete and after fragmentation, screening, obtains recycled coarse aggregate, recycled fine aggregate and powder, powder is heat-treated obtain regenerative gel material.Here recycled coarse aggregate that obtains and recycled fine aggregate and technology type 1 are similar; Isolated powder is mainly the cement stone that contains the aquation Calucium Silicate powder; Obtain being similar to the Calucium Silicate powder of cement clinker mineral after the heating dehydration; Thereby have hydraulically active, and can in less important engineering, make cement or part and replace cement and use, be equivalent to that " separation " goes out cement from discarded concrete.The ratio of amount that the quantity of the regenerative gel material that this method can be recovered to accounts for whole discarded concrete is very little, not the technical barrier that faces of technical solution form 1 fundamentally.
3. with the starting material of discarded concrete, be about to discarded concrete and be used with Wingdale, clay (or shale, sandstone) and iron powder (or sulfate slag) starting material as calcination of cement clinker through oven dry, after broken as calcination of cement clinker.This technology type is based on above-mentioned technology type 1 and all exists technical barrier to occur with technology type 2, still rarely found at present report.In " utilizing discarded concrete to produce the research of green cement " article of " state's outdoor building materials science and technology " works such as the 26th volume the 2nd phase Wan Huiwen in 2005; Introduced 40%, 60%, 80% the discarded concrete replace lime technology that is equipped with cement clinker made of stones of utilizing; Its cement clinker that obtains is that 0.32 o'clock intensity can reach 47.4MPa at wc, but the river sand because of containing in the discarded concrete causes not only difficult mill but also difficult the burning; Thereby cause f-CaO content to increase the downgrade of grog.In " discarded concrete replaces the experiment of natural limestone calcination of cement clinker " article of 2008 the 31st impartial works of volume the 9th phase ten thousand courts of University Of Chongqing's journal (natural science edition); Though solved calcining and cement clinker quality problem; The utilization ratio of discarded concrete is about 65%, but still also need use Wingdale and clay in the raw material (or shale, sandstone).Wingdale and clay (or shale, sandstone) all are non-renewable natural resource, the basic substance that clay is still ploughed and rely and exist.18.68 hundred million tons of China's cement outputs in 2010; 11.52 hundred million tons of grog output consume 0.20～0.21 ton of clay, 1.25～1.27 tons of calculating of Wingdale by grog per ton; About 14.5 hundred million tons of the annual Wingdale that consumes; About 2.36 hundred million tons of clay, though most cement mill has used shale, sandstone etc. to replace clay, shale, sandstone are still non-renewable natural resource and face exhausted day by day problem.Simultaneously; Whole nation cement output is also with lasting the riseing of nearly 100,000,000 tons rate of growth in every year; Therefore, the gesture of Wingdale, shale, sandstone resource exhaustion manifests day by day, and the contradiction of striving clay with the arable land is becoming increasingly acute; Exploitation substitutes natural limestone and clay (or shale, sandstone) fully, and to prepare the technology and method of cement clinker imperative, significant to guaranteeing sustainable development of cement industry.
Summary of the invention
The problem that the present invention will solve provides a kind of method for preparing cement clinker with discarded concrete; Realized substituting natural limestone and clay (or shale, sandstone) fully with discarded concrete; Thereby further improve the utilization ratio of discarded concrete, to practice thrift using non-renewable natural resourcess such as natural limestone and clay (or shale, sandstone) significant.
It is for this reason, according to the invention that to prepare the method for cement clinker with discarded concrete following:
(1) collect discarded concrete, by traditional technology be dried, fragmentation, select the concrete particle that particle diameter is 5mm～20mm;
(2) with the concrete particle batching, the mixing that obtain; Add iron powder or sulfate slag after drying; Mix and levigately after using 80 μ m square hole sieves to tail over to be 8%～16% powder, obtain cement raw meal; If what add is iron powder, then the quality of concrete percentage composition is 98.5%～99.5% in the cement raw meal, and the quality percentage composition of iron powder is 0.5%～1.5%; If what add is sulfate slag, then the quality of concrete percentage composition is 95.0%～96.0% in the cement raw meal, and the quality percentage composition of sulfate slag is 4.0%～5.0%;
(3) above-mentioned raw material powder is obtained cement clinker by traditional technology after balling-up, calcining and quenching operation.
The present invention isolates discarded concrete the concrete particle of certain grain size scope after oven dry, fragmentation, screening; Main calcareous raw material as calcining cement clinker; Avoided the shortcoming that water-intake rate is high, suction is fast, crush index is big, Young's modulus is low that exists when it is used as regenerated aggregate; And isolated concrete particle to account for the quality percentage composition of whole discarded concrete high, the utilization ratio of discarded concrete is greatly improved.Because be that fine particle below the 5mm has been separated with particle diameter after the fragmentation, the river sand of having avoided containing in the discarded concrete causes not only difficult mill but also difficult problem of burning, levigately realizes more easily with calcining process, make the cement clinker quality of final acquisition stable, reliably.Simultaneously, simply composite through isolated concrete particle is carried out, wherein the content of element silicon can satisfy the composition requirement of cement clinker to siliceous raw material; That is to say, isolated concrete particle after composite, just can be simultaneously as the calcareous raw material and the siliceous raw material of calcining cement clinker; Thus; In the raw material of cement raw meal, except that discarded concrete, have only ferriferous raw materials such as iron powder or sulfate slag; No longer contain natural limestone and clay (or shale, sandstone); It is feasible fully that this explanation substitutes natural limestone and clay (or shale, sandstone) preparation cement clinker fully with discarded concrete, and this is to raising discarded concrete utilising efficiency, and it is significant to avoid the use of natural resourcess such as non-renewable natural limestone and clay (or shale, sandstone).
Through the experiment proof; The quality percentage composition of discarded concrete in cement slurry reached more than 95% among the present invention; The quality of gained cement clinker and portland cement clinker is suitable; Cement intensity with its preparation reaches 32.5 grades, 42.5 grades or 52.5 grades, can be used as starting material and is applied among the concrete preparation, thereby found a good use approach for the resource utilization of discarded concrete.
Description of drawings
Fig. 1-1, Fig. 1-2, Fig. 1-3, Fig. 1-4, Fig. 1-5, Fig. 1-6, Fig. 1-7 are respectively the XRD figure spectrums of reference grog and the cement clinker S1-S6 for preparing among the embodiment.
Fig. 2 is the f-CaO content comparison diagram of gained grog and Lafarge grog among the embodiment.
Fig. 3 is gained cement 3d ultimate compression strength and Lafarge cement clinker among the embodiment, commercially available cement comparison diagram.
Fig. 4 is gained cement 28d ultimate compression strength and Lafarge cement clinker among the embodiment, commercially available cement comparison diagram.
Embodiment
Through Test Example the present invention is elaborated below and verifies.
From 7 typical discarded concrete samples of the on-the-spot picked at random of different demolishing buildings, be numbered F1-F7 respectively.Be crushed to particle diameter below 20mm with jaw crusher, sieve out the particle that particle diameter is 5mm～20mm, to predetermined fineness, carry out the chemical ingredients total analysis through the ball mill grinding, the result is as shown in table 1.
Table 1 discarded concrete chemical composition analysis result
Discarded concrete is broken, sieve out the particle of particle diameter greater than 5mm after, staple is a limestone aggregate, the mortar of its surface adhesion in shattering process since the effect major part of pulsating stress peel off and be sized away from surface of aggregate.The result finds out by table 1 chemical composition analysis: the staple of discarded concrete is CaO, and CaO content is close in the discarded concrete of different sources, and near the content of CaO in the natural limestone.SiO in the discarded concrete
2Content all is higher than natural limestone, and this is because a small amount of mortar of discarded concrete surface adhesion has been brought river sand into.But silicon is controlled SiO in the discarded concrete as the essential element of calcining cement clinker
2Content and makes each rate value reach design requirements through batching within the specific limits, just can not cause obvious influence to the grog performance.
The preparation cement other raw materials have: iron powder, sulfate slag, natural dihydrate gypsum, more than each raw material be that Lafarge cement mill, Chongqing provides, chemical ingredients is seen table 2.
The reference grog is that Lafarge cement mill, Chongqing produces, and is used to prepare the grog of 42.5 ordinary Portland cements, and the design rate value is: KH=0.91 ± 0.02, IM=1.4 ± 0.1, SM=2.6 ± 0.1.
Reference cement is 42.5 ordinary Portland cements that Lafarge cement mill, Chongqing produces.
The chemical ingredients of table 2 iron powder, sulfate slag, natural dihydrate gypsum
1. raw material preparation
After discarded concrete fragmentation, screening, grinding to 80 μ m square hole sieve screen over-size is 8%～16%, is rate target value preparation cement slurry by reference grog rate value, numbering R1-R6.The batching result sees table 3.
Table 3 raw meal proportioning result
Annotate: used discarded concrete sample is picked at random in every group of raw material
Can find out that from table 3 through the mix of a plurality of discarded concrete samples, each raw material sample rate value is basicly stable, and basically all within rate target value permissible error.It is feasible that this explanation replaces natural limestone and clay (or shale, sandstone) to prepare cement clinker with discarded concrete fully.Natural limestone and clay (or shale, sandstone) are not all used in the preparation of each raw material, and its rate value can meet the demands, and this is owing to introduced part river sand in a small amount of mortar of discarded concrete surface adhesion, has served as siliceous raw material.Discarded concrete content is all more than 95% in each raw material, and this is significant to improving the discarded concrete utilising efficiency, reduce natural resourcess such as using natural limestone, clay (or shale, sandstone).
2. clinker burning
After being warmed up to high-temperature electric resistance furnace about 800 ℃, put into the crucible that cement slurry after the balling-up is housed, continue to heat up and the control heat-up rate is 4～5 ℃/min.Insulation 30min takes out after being warming up to 1450 ℃, cooling fast in air.
3. cement preparation
In the good cement clinker of calcining, mix massfraction and be 3% natural dihydrate gypsum of (in mix) is milled to specific surface area>=300m through ball mill
2/ kg makes silicate cement.
The XRD figure spectrum of the cement clinker S1-S6 that Fig. 1 calcines out for reference grog and raw material R1-R6.As can beappreciated from fig. 1: discarded concrete substitutes natural limestone and clay (or shale, sandstone) incinerating cement clinker C fully
3S, C
2S, C
3A, C
4The AF characteristic peak is clear, and with reference grog no significant difference.
Utilize the glycol method of GB/T 176-2008 regulation that the f-CaO content of prepared grog is measured, and compare analysis with the reference grog, the result is as shown in Figure 2.As can beappreciated from fig. 2, each is organized f-CaO content and all is lower than the reference grog, and the C that respectively organizes grog is described
3S forms normally, does not have the problem of " the difficult burning ".
Grog S1-S6 and reference grog are prepared cement by " 3. cement preparation " said method, and reference numeral is SN1-SN6, LFJ.These 7 cement sample and reference cement L42.5 are carried out the strength comparison test; Stir into cement paste by wc 0.5 respectively; Be shaped to and be immersed in behind the right cylinder test specimen of diameter 27mm, high 27mm in 20 ± 1 ℃ of saturated limewaters after the maintenance; Test 3d and 28d intensity, result such as Fig. 3, shown in Figure 4.Can know that by Fig. 3 except that SN3, SN4, it is suitable with commercially available Lafarge 42.5 ordinary Portland cement L42.5 that all the other respectively organize 3d ultimate compression strength.Can know that by Fig. 4 SN1-SN6 is suitable with the 28d ultimate compression strength of cement LFJ that is prepared by the Lafarge grog and commercially available Lafarge 42.5 ordinary Portland cement L42.5.This explanation utilizes the cement of discarded concrete as the main raw material preparation, and its 3d intensity is on the low side relatively, but the 28d strength development is good.Do not have positive connection between the size of discarded concrete substitution rate and the cement performance that is burnt till, the control of raw material rate value is the principal element that influences strength of cement.
According to above-mentioned strength test result; Choose representational SN1 sample and it is carried out the cement mortar strength test according to the GB/T17671-1999 standard; And with stipulate among test result and the standard GB 175-2007 42.5, the strength standard value of 42.5R, 52.5,52.5R level ordinary Portland cement compares; To demarcate the strength grade of SN1 cement sample, the result is as shown in table 4.
Table 4SN1 cement sample cement mortar strength test-results and contrast
Can find out that from table 4 SN1 cement sample 3d and 28d intensity have all reached the requirement of strength of 42.5 grades of silicate cements, 28d intensity even reached the strength criterion of 52.5 grades of silicate cements.So judging the strength grade of this cement sample is 42.5 grades.
Claims (6)
1. one kind prepares the method for cement clinker with discarded concrete, it is characterized in that, carries out as follows:
(1) collect discarded concrete, by traditional technology be dried, fragmentation, select the concrete particle that particle diameter is 5mm～20mm;
(2) with the concrete particle batching, the mixing that obtain; Add iron powder or sulfate slag after drying; Mix and levigately after using 80 μ m square hole sieves to tail over to be 8%～16% powder, obtain cement raw meal; If what add is iron powder, then the quality of concrete percentage composition is 98.5%～99.5% in the cement raw meal, and the quality percentage composition of iron powder is 0.5%～1.5%; If what add is sulfate slag, then the quality of concrete percentage composition is 95.0%～96.0% in the cement raw meal, and the quality percentage composition of sulfate slag is 4.0%～5.0%;
(3) above-mentioned raw material powder is obtained cement clinker by traditional technology after balling-up, calcining and quenching operation.
2. prepare the method for cement clinker according to claim 1 is said with discarded concrete, it is characterized in that the quality percentage composition proportioning of cement raw meal is in the step (2):
Discarded concrete 98.80%,
Iron powder 1.20%.
3. prepare the method for cement clinker according to claim 1 is said with discarded concrete, it is characterized in that the quality percentage composition proportioning of cement raw meal is in the step (2):
Discarded concrete 98.77%,
Iron powder 1.23%.
4. prepare the method for cement clinker according to claim 1 is said with discarded concrete, it is characterized in that the quality percentage composition proportioning of cement raw meal is in the step (2):
Discarded concrete 99.04%,
Iron powder 0.96%.
5. prepare the method for cement clinker according to claim 1 is said with discarded concrete, it is characterized in that the quality percentage composition proportioning of cement raw meal is in the step (2):
Discarded concrete 95.76%,
Sulfate slag 4.24%.
6. prepare the method for cement clinker according to claim 1 is said with discarded concrete, it is characterized in that the quality percentage composition proportioning of cement raw meal is in the step (2):
Discarded concrete 95.68%,
Sulfate slag 4.32%.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102898049A (en) * | 2012-11-12 | 2013-01-30 | 枣庄中联水泥有限公司 | Cement clinker produced from shale instead of clay and production process thereof |
| WO2015021700A1 (en) * | 2013-08-13 | 2015-02-19 | Yin Wuji | Method for using waste concrete as cement admixture and cement obtained therefrom |
| CN105130221A (en) * | 2015-07-09 | 2015-12-09 | 湖南省小尹无忌环境能源科技开发有限公司 | Method for comprehensively utilizing waste concrete and sludge to produce ecologic clinker |
| CN107162446A (en) * | 2017-06-12 | 2017-09-15 | 镇江宇神动力能源有限公司 | A kind of low alkali cement |
| CN109320110A (en) * | 2018-10-24 | 2019-02-12 | 河南理工大学 | It is a kind of using sulphur tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN110218036A (en) * | 2019-07-04 | 2019-09-10 | 中冶建工集团有限公司 | The method for preparing regeneration concrete using discarded concrete |
| CN110404632A (en) * | 2019-07-08 | 2019-11-05 | 张沁玥 | A kind of building castoff regeneration method and application |
| CN112429984A (en) * | 2020-11-24 | 2021-03-02 | 中国地质科学院郑州矿产综合利用研究所 | Recycled cement prepared from waste concrete and preparation method and application thereof |
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| CN101274824A (en) * | 2008-05-14 | 2008-10-01 | 重庆大学 | Cement clinker and preparation thereof |
| CN102060485A (en) * | 2010-12-02 | 2011-05-18 | 济南大学 | Cement concrete, and preparation method and recycling method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101274824A (en) * | 2008-05-14 | 2008-10-01 | 重庆大学 | Cement clinker and preparation thereof |
| CN102060485A (en) * | 2010-12-02 | 2011-05-18 | 济南大学 | Cement concrete, and preparation method and recycling method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102898049A (en) * | 2012-11-12 | 2013-01-30 | 枣庄中联水泥有限公司 | Cement clinker produced from shale instead of clay and production process thereof |
| WO2015021700A1 (en) * | 2013-08-13 | 2015-02-19 | Yin Wuji | Method for using waste concrete as cement admixture and cement obtained therefrom |
| CN105130221A (en) * | 2015-07-09 | 2015-12-09 | 湖南省小尹无忌环境能源科技开发有限公司 | Method for comprehensively utilizing waste concrete and sludge to produce ecologic clinker |
| CN107162446A (en) * | 2017-06-12 | 2017-09-15 | 镇江宇神动力能源有限公司 | A kind of low alkali cement |
| CN109320110A (en) * | 2018-10-24 | 2019-02-12 | 河南理工大学 | It is a kind of using sulphur tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN110218036A (en) * | 2019-07-04 | 2019-09-10 | 中冶建工集团有限公司 | The method for preparing regeneration concrete using discarded concrete |
| CN110404632A (en) * | 2019-07-08 | 2019-11-05 | 张沁玥 | A kind of building castoff regeneration method and application |
| CN112429984A (en) * | 2020-11-24 | 2021-03-02 | 中国地质科学院郑州矿产综合利用研究所 | Recycled cement prepared from waste concrete and preparation method and application thereof |
| CN112429984B (en) * | 2020-11-24 | 2022-04-12 | 中国地质科学院郑州矿产综合利用研究所 | Recycled cement prepared from waste concrete and preparation method and application thereof |
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Application publication date: 20120620 |