CN103011648B - Modified active iron tailing admixture for concrete and preparation method thereof - Google Patents
Modified active iron tailing admixture for concrete and preparation method thereof Download PDFInfo
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- CN103011648B CN103011648B CN201210585500.7A CN201210585500A CN103011648B CN 103011648 B CN103011648 B CN 103011648B CN 201210585500 A CN201210585500 A CN 201210585500A CN 103011648 B CN103011648 B CN 103011648B
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- iron tailings
- polycarboxylate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides a modified active iron tailing admixture for concrete, which comprises the following elements: iron tailings and polycarboxylate, wherein the dosage of the polycarboxylate is 0.2-0.6wt% based on the mass of the iron tailings, and both the specific surface of the iron tailings and that of the polycarboxylate are 400-600m<2>/kg. Replacing slag powder and pulverized coal ash, the active iron tailing admixture provided by the invention is applied to the concrete and can prepare C10-C100 pump concrete, and the active iron tailing admixture can meet each performance index of build concrete and has a brilliant application prospect in the construction engineering.
Description
Technical field
The present invention relates to a kind of the reinforcement of concrete Modified Iron mine tailing active admixture and preparation method thereof, belong to technical field of concrete.
Background technology
Iron tailings is the discarded object after iron ore fragmentation (dry magnetic separation), grinding (wet magnetic separation), sorting iron powder.In the last few years, along with the fast development of China's steel industry, produce the iron tailings that 1 ton of iron powder can produce 1.5 tons, the discharge capacity of iron tailings increases year by year; At present, the whole of China has accumulated stores up iron tailings over ten billion ton, takies a large amount of soils, mountains and rivers, and welding also endangers ecology simultaneously.
At present, in concrete, the general admixture of 30 ~ 50% that uses replaces cement, and uses various additive to reduce Cost of Concrete and to improve performance; Wherein, the concrete admixture used is master mainly with slag powders and flyash.In the last few years, in some big and medium-sized cities, because construction scope sharply expands, also develop rapidly in the whole nation along with ready-mixed concrete industry, the consumption bringing slag powders and flyash thus also sharply increases, thus cause slag powders to occur shortage as concrete admixture, and then the price of slag powders is constantly raised.In addition; along with the enhancing of environmental protection consciousness and the enforcement of carbon emission tax; thermal power generation proportion in energy resource structure can decline day by day; the flyash discharge expection of power plant has obvious reduction; paradoxically concrete demand still can with the speed increase of about 5% with it; therefore, seek a kind of slag powders and the alternate resources of flyash in concrete, just particularly urgent.
In order to solve concrete amount sharply increase and slag powders and flyash underproduce between contradiction, if iron tailings can be replaced completely slag powders and flyash to be used as concrete admixture, so not only can solve iron tailings and pile up the environmental problem brought but also slag powders and the underproduce problem of flyash can be solved.But, in prior art, because the activity of iron tailings is inadequate, therefore preparing in Concrete, iron tailings and flyash or slag powders or flyash and slag powders mixture must be used simultaneously, just can prepare the concrete meeting build concrete property indices.
Summary of the invention
Technical problem to be solved by this invention be in prior art iron tailings due to activity not must with flyash or slag powders be used in combination just can as the problem of concrete admixture, and then provide one that slag powders and flyash can be replaced completely for concrete Modified Iron mine tailing active admixture.
In order to solve the problems of the technologies described above, the invention provides a kind of the reinforcement of concrete Modified Iron mine tailing active admixture, comprising following component: iron tailings, polycarboxylate; Wherein, in the quality of iron tailings, the addition of described polycarboxylate is 0.2 ~ 0.6wt%; The specific area of described iron tailings and described polycarboxylate is 400 ~ 600m
2/ kg, the number-average molecular weight of described polycarboxylate is 3000 ~ 6000.
The specific area of described iron tailings and described polycarboxylate is 450 ~ 550m
2/ kg.
In the quality of iron tailings, SiO in described iron tailings
2content is greater than 50wt%.
In the quality of iron tailings, SiO in described iron tailings
2content is greater than 80wt%.
In the quality of iron tailings, in described iron tailings, iron content is less than 12wt%.
In the quality of iron tailings, in described iron tailings, iron content is less than 8wt%.
Prepare a method for described the reinforcement of concrete Modified Iron mine tailing active admixture, comprise the steps: the above-mentioned iron tailings of specified quantitative and above-mentioned polycarboxylate to be milled to specific specific area altogether, prepare described the reinforcement of concrete Modified Iron mine tailing active admixture.
The present invention compared with prior art tool has the following advantages:
(1) the reinforcement of concrete Modified Iron mine tailing active admixture of the present invention, by mixing the polycarboxylate of 0.2 ~ 0.6wt% in iron tailings, controls the specific area of iron tailings and polycarboxylate at 400 ~ 600m simultaneously
2within the scope of/kg, polycarboxylate can play peptizaiton to the iron tailings under this specific area on the one hand, it can directly be adsorbed in iron tailings surface on the other hand, to prepare in Concrete polycarboxylate first directly and iron tailings effect, be convenient to improve the hydration activity of iron tailings in concrete, make iron tailings of the present invention that slag powders and flyash can be replaced completely for concrete admixture.Iron tailings active admixture of the present invention substitutes slag powders and flyash for preparing C10 ~ C100 pump concrete in concrete, and can meet build concrete property indices, has broad application prospects in construction project.In addition, found by the continuous research of inventor, iron tailings is different from flyash or slag powders, its activity can't increase along with the continuous increase of specific area, when the specific area controlling iron tailings and polycarboxylate is specific specific area, the synergy of iron tailings and polycarboxylate has excellent effect, thus makes iron tailings that slag powders and flyash can be replaced completely as concrete active admixture.
(2) the reinforcement of concrete Modified Iron mine tailing active admixture of the present invention, the specific area controlling described iron tailings and polycarboxylate is further 450 ~ 550m
2during/kg, this iron tailings active admixture can have optimum activity, compared with adopting the concrete of other admixture mixing, has good fluidity, good water-retaining property, cohesiveness is suitable for, density is got well and carbonization is low feature.
(3) preparation method of the reinforcement of concrete Modified Iron mine tailing active admixture of the present invention, process by carrying out common mill to iron tailings and polycarboxylate, a small amount of vitreum in common mill processing procedure in iron tailings under external force, its network structure ruptures, distortion and distortion of lattice, simultaneously in the quality of iron tailings, when adding 0.2 ~ 0.6wt% polycarboxylate, polycarboxylate with iron tailings altogether honed journey in can directly adsorb and levigate iron tailings surface, polycarboxylate can play the peptizaiton to levigate iron tailings on the one hand, iron tailings is avoided to produce clustering phenomena when levigate process, on the other hand in follow-up concrete preparation process, polycarboxylate can first directly and iron tailings effect, be convenient to like this improve the hydration activity of iron tailings in concrete.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described in detail, but is not limited to this.
Raw material of the present invention are selected:
Iron tailings: particle diameter 0.315 ~ 2.5mm, modulus of fineness 1.3, place of production Miyun Region of Beijing;
Polycarboxylate: number-average molecular weight 3000 ~ 6000, commercially available;
Cement: commercially available P.O425 cement;
Sand: medium sand, modulus of fineness is 2.6 ~ 2.8, and average grain diameter is 0.315 ~ 5mm, Zhuozhou, the place of production;
Rubble: particle diameter is 5.00-25.0mm, continuous grading, Hebei San He;
Polycarboxylate additive: Beijing China enlightening HDP high performance water reducing agent of polyocarboxy acid;
Flyash: II level flyash, Beijing Xingda;
Slag powders: S95 level, Beijing Xingda.
embodiment 1
Take the SiO of 5000g
2content is the iron tailings of 40wt% ~ 50wt%, and the polycarboxylate being 3000 with the number-average molecular weight of 10g mixes, and mixing rear altogether mill, to obtain specific area be 400m
2the Modified Iron mine tailing active admixture A of/kg.
embodiment 2
Take the SiO of 5000g
2content is 50wt% ~ 60wt%, and iron-holder is the iron tailings of 10 ~ 12wt%, and the polycarboxylate being 4000 with the number-average molecular weight of 15g mixes, and mixing rear altogether mill, to obtain specific area be 450m
2the Modified Iron mine tailing active admixture B of/kg.
embodiment 3
Take the SiO of 5000g
2content is 60wt% ~ 70wt%, and iron-holder is the iron tailings of 8 ~ 10wt%, and the polycarboxylate being 5000 with the number-average molecular weight of 20g mixes, and mixing rear altogether mill, to obtain specific area be 500m
2the Modified Iron mine tailing active admixture C of/kg.
embodiment 4
Take the SiO of 5000g
2content is 70wt% ~ 80wt%, and iron-holder is the iron tailings of 6 ~ 8wt%, and the polycarboxylate being 6000 with the number-average molecular weight of 25g mixes, and mixing rear altogether mill, to obtain specific area be 550m
2the Modified Iron mine tailing active admixture D of/kg.
embodiment 5
Take the SiO of 5000g
2content is 80wt% ~ 90wt%, and iron-holder is the iron tailings of 3 ~ 5wt%, and the polycarboxylate being 5500 with the number-average molecular weight of 30g mixes, and mixing rear altogether mill, to obtain specific area be 600m
2the Modified Iron mine tailing active admixture E of/kg.
embodiment 6
Take the SiO of 5000g
2content is 90wt% ~ 95wt%, and iron-holder is the iron tailings of 2 ~ 4wt%, and the polycarboxylate being 4500 with the number-average molecular weight of 30g mixes, and mixing rear altogether mill, to obtain specific area be 600m
2the Modified Iron mine tailing active admixture F of/kg.
performance measurement evaluation Example
Get the concrete that Modified Iron mine tailing active admixture that above-described embodiment 1 to 6 prepares prepares C10, C30, C50, C60, C80 and C100 respectively, concrete formulation is in table 1, and the slump and 28d intensity test are carried out respectively to the concrete prepared, test result is in table 1.
Present invention also offers using flyash or slag powders as the concrete formula of the C10 ~ C100 of concrete admixture in table 1 simultaneously, and the concrete prepared also has been carried out respectively to the contrast test of slump and 28d compression strength, test result is in table 1.
Table 1 concrete formulation and the performance test results
As can be seen from above-mentioned test result, the concrete adopting Modified Iron mine tailing active admixture of the present invention to prepare and flyash or slag powder concrete workability substantially identical with compression strength performance, illustrate that Modified Iron mine tailing active blending material of the present invention can substitute flyash completely and slag powders uses in concrete.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments, and thus the apparent change of extending out or variation be still among the protection domain of the invention claim.
Claims (7)
1. a reinforcement of concrete Modified Iron mine tailing active admixture, is characterized in that, is made up of iron tailings and polycarboxylate; Wherein, in the quality of iron tailings, the addition of described polycarboxylate is 0.2 ~ 0.6wt%; The specific area of described iron tailings and described polycarboxylate is 400 ~ 600m
2/ kg, the number-average molecular weight of described polycarboxylate is 3000 ~ 6000.
2. the reinforcement of concrete Modified Iron mine tailing active admixture according to claim 1, it is characterized in that, the specific area of described iron tailings and described polycarboxylate is 450 ~ 550m
2/ kg.
3. the reinforcement of concrete Modified Iron mine tailing active admixture according to claim 1, is characterized in that, in the quality of iron tailings, and SiO in described iron tailings
2content is greater than 50wt%.
4. the reinforcement of concrete Modified Iron mine tailing active admixture according to claim 3, is characterized in that, in the quality of iron tailings, and SiO in described iron tailings
2content is greater than 80wt%.
5., according to the arbitrary described the reinforcement of concrete Modified Iron mine tailing active admixture of claim 1 ~ 3, it is characterized in that, in the quality of iron tailings, in described iron tailings, iron content is less than 12wt%.
6. the reinforcement of concrete Modified Iron mine tailing active admixture according to claim 5, is characterized in that, state iron content in iron tailings and be less than 8wt%.
7. prepare a method for the arbitrary described the reinforcement of concrete Modified Iron mine tailing active admixture of claim 1 ~ 6, comprise the steps:
(1) the above-mentioned iron tailings of specified quantitative and polycarboxylate are mixed;
(2) material mixed in step (1) is milled to specific specific area altogether, prepares described the reinforcement of concrete Modified Iron mine tailing active admixture.
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|---|---|---|---|
| CN201210585500.7A CN103011648B (en) | 2012-12-28 | 2012-12-28 | Modified active iron tailing admixture for concrete and preparation method thereof |
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| CN201210585500.7A CN103011648B (en) | 2012-12-28 | 2012-12-28 | Modified active iron tailing admixture for concrete and preparation method thereof |
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| CN103011648B true CN103011648B (en) | 2015-04-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106746858B (en) * | 2016-12-02 | 2018-01-02 | 湖北工业大学 | A kind of preparation method of the mineral admixture slurry of high-performance prefabricated component |
| CN107058721B (en) * | 2017-05-15 | 2019-02-01 | 厦门清胜环保科技有限公司 | A kind of magnetizing roast Ultrafine Grinding iron tailings processing method and system for replacement wollastonite powder |
| CN112094061A (en) * | 2020-09-16 | 2020-12-18 | 张延年 | Iron tailing based concrete admixture and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182141A (en) * | 2007-11-14 | 2008-05-21 | 北京科技大学 | Method for preparing high-strength structure material by using iron tailings |
| CN102060481A (en) * | 2010-11-15 | 2011-05-18 | 北京新奥混凝土集团有限公司 | Low cementitious material self-compacting concrete |
| CN102658596A (en) * | 2012-06-01 | 2012-09-12 | 北京科技大学 | Method for preparing high-strength concrete material by using fly ash and iron tailings |
-
2012
- 2012-12-28 CN CN201210585500.7A patent/CN103011648B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182141A (en) * | 2007-11-14 | 2008-05-21 | 北京科技大学 | Method for preparing high-strength structure material by using iron tailings |
| CN102060481A (en) * | 2010-11-15 | 2011-05-18 | 北京新奥混凝土集团有限公司 | Low cementitious material self-compacting concrete |
| CN102658596A (en) * | 2012-06-01 | 2012-09-12 | 北京科技大学 | Method for preparing high-strength concrete material by using fly ash and iron tailings |
Non-Patent Citations (2)
| Title |
|---|
| 铁尾矿对混凝土性能的影响;郭玉香 等;《冶金能源》;20110930;第30卷(第5期);第41-44页 * |
| 高效减水剂对铁尾矿高性能混凝土性能的影响;崔兴兰 等;《金属矿山》;20110131(第415期);第158-161页 * |
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