CN104402257A - Cyclic utilization method for potassium-hydroxide alkali activated slag concrete - Google Patents

Cyclic utilization method for potassium-hydroxide alkali activated slag concrete Download PDF

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Publication number
CN104402257A
CN104402257A CN201410583489.XA CN201410583489A CN104402257A CN 104402257 A CN104402257 A CN 104402257A CN 201410583489 A CN201410583489 A CN 201410583489A CN 104402257 A CN104402257 A CN 104402257A
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China
Prior art keywords
slag
concrete
alkali
activated
stone
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CN201410583489.XA
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Chinese (zh)
Inventor
徐德龙
宋强
李辉
张肖艳
朱建辉
李婷
王储
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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Priority to CN201410583489.XA priority Critical patent/CN104402257A/en
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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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

A cyclic utilization method for potassium-hydroxide alkali activated slag concrete is disclosed and comprises: firstly performing mixture calculation to obtain the proportions of crude aggregate and fine aggregate which possess chemical compositions similar to the chemical compositions of mineral slag after ignition loss and water are removed; then uniformly mixing the aggregates with the proportions with an alkali activating agent potassium hydroxide, so as to prepare an alkali-activated cementing material concrete; and after the concrete is used, calcining the concrete at 1450-1500 DEG C, and performing water quenching, so as to again obtain the active cementing material and realize cyclic utilization of the potassium-hydroxide alkali activated cementing material. The method realizes repeated utilization of alkali-activated concrete, is capable of saving limestone resource and has substantial economical efficiency and operability.

Description

Potassium hydroxide alkali-activated slag concrete circulation utilization method
Technical field
The invention belongs to building material field, particularly a kind of potassium hydroxide alkali-activated slag concrete circulation utilization method.
Background technology
The chemical composition of alkali-activated carbonatite gelling material is primarily of CaO, SiO 2, Al 2o 3form, and the ceramic of silicon (aluminium) oxygen tetrahedral network structure can be formed in alkaline environment.The chemical composition of this material is similar with hydrated gel product structure to traditional portland composition with gel structure.The production of this material, without the need to calcining, does not produce greenhouse gases in production process substantially, and energy-saving and emission-reduction, environmental protection effect are very outstanding, is the potential equivalent material of traditional portland.But similar to traditional portland, it will produce a large amount of building wastes after terminating under arms, the recycling of these building wastes is the problems affecting the application of its through engineering approaches.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of potassium hydroxide alkali-activated slag concrete circulation utilization method, by the concrete mix of adjustment alkali-activated carbonatite gelling material preparation, make the chemical composition of its concrete entirety identical with raw ingredients of cement or close, by the time after this concrete End Of Service is removed, calcined as new gelling material again, this technique can make the concrete debris of the alkali-activated carbonatite gelling material preparation after removing obtain second stage employ, there is technique simple, energy-conserving and environment-protective, it is convenient to control, be convenient to the feature of industrial applications
To achieve these goals, the technical solution used in the present invention is:
Potassium hydroxide alkali-activated slag concrete circulation utilization method, is characterized in that, comprising:
Step one, measure the chemical composition of the reinforcement of concrete fine aggregate, coarse aggregate and alkali-activated carbonatite slag used, and by charge calculation, when being not counted in loss on ignition, make (CaO+MgO) in thick, fine aggregate and slag three kinds of solid mixtures: (SiO 2+ Al 2o 3) be greater than 1.5 and be less than 2.4, determine the mass ratio of concrete coarse aggregate, fine aggregate and slag;
Step 2, meets thick, fine aggregate and the ground slag powder of chemical constitution in step one, prepares alkali-activated carbonatite cementitious material concrete with alkali-activator potassium hydroxide after jointly mixing;
Step 3, after this concrete terminates under arms, it is broken, grinding is the powder that particle diameter is less than 80 microns, be placed on calcining also cooling fast at 1450 DEG C-1500 DEG C in calciner again, material after calcining passes through below fragmentation, grinding to 80 micron again, namely obtain new gelling material, thus the useful component in slag and coarse-fine aggregate is reused.
Described fine aggregate is sand, and particle diameter is less than 5mm; Described coarse aggregate is stone, and particle diameter is greater than 5mm.
If the mass ratio of stone and sand is greater than 2.0, then the fragmentation of part stone is become Machine-made Sand, to guarantee that coarse aggregate and fine aggregate mass ratio are between 1.5-2.0.
The landfill general with traditional architecture disposal of garbage or be used as compared with regeneration aggregate, present technology provides and a kind ofly can reuse the method for alkali-activated carbonatite concrete construction rubbish as the raw material of production gelling material.Use this technology to achieve the concrete recycling of alkali-activated carbonatite, can limestone resource be saved.Meanwhile, above-mentioned technique is at Concrete, and discarded concrete is broken, grinding, and the aspects such as secondary clacining are all proven technique, have significant economy and operability.
Accompanying drawing explanation
Fig. 1 is that the present invention tests proportioning raw material position view residing in five yuan of phasors.
Embodiment
Embodiments of the present invention are described in detail below in conjunction with drawings and Examples.
Potassium hydroxide alkali-activated slag concrete circulation utilization method of the present invention, first the chemical composition of concrete batching sand used (i.e. fine aggregate), stone (i.e. coarse aggregate) and slag is measured, under regular situation, its composition (mass percent) index is as follows:
The loss on ignition of sand: 1-2%, the SiO of the CaO of 2-5%, 60-80% 2, the Al of 10-15% 2o 3, the Fe of 2-4% 2o 3, the R of the MgO of 0-2%, 1-6% 2o, and surplus impurity;
The loss on ignition of stone: 20-35%, the SiO of the CaO of 30-40%, 10-20% 2, the Al of 1-3% 2o 3, the Fe of 0-2% 2o 3, the R of the MgO of 2-18%, 0-1.5% 2o, and surplus impurity;
The loss on ignition of slag: 1-2%, the SiO of the CaO of 40-65%, 15-25% 2, the Al of 1-5% 2o 3, the Fe of 1-8% 2o 3, the R of the MgO of 1-8%, 0-2% 2o, and surplus impurity.
In the present embodiment, concrete Selection parameter is shown in Table 1, and according to the chemical composition in table 1, the proportioning calculated between stone, sand, slag is 3.3:0.7:1.Under this proportioning, remove its chemical composition outside moisture and loss on ignition in concrete and all fall into Fig. 1 square frame position, in Fig. 1, A represents slag chemical composition, and B represents phosphorus slag chemical composition, and C represents test sample composition, and D represents portland cement clinker chemical composition.Can find out, this composition and between Portland clinker and granulated blast-furnace slag, close with electric furnace phosphoric slag composition, by melting, shrend can obtain certain active gelling material.
Table 1 concrete material chemical composition (mass percent)
Raw material Loss on ignition CaO SiO 2 Al 2O 3 Fe 2O 3 MgO R 2O Impurity Add up to
Stone 29.68 36.87 16.17 2.34 0.696 12.56 0.827 Surplus 100％
Sand 1.4 2.61 73.99 12.44 2.54 0.62 5.3 Surplus 100％
Slag 1.8 62.7 20.01 3.82 4 1.48 1.2 Surplus 100％
Because the content of the coarse aggregate stone in above-mentioned raw materials ratio is compared higher than concrete mix current at present.Wherein part stone can be broken into particle diameter and be less than the fine aggregate of 5mm and natural sand jointly as fine aggregate concrete batching.
1m 3in concrete, slag is 430kg, 671kg fine aggregate (wherein 301kg sand listed by table 1,370kg stone listed by table 1 is broken into the Machine-made Sand that particle diameter is less than 5mm), 1049kg coarse aggregate, potassium hydroxide as alkali-activator mixes according to 5% of slag quality, i.e. 21.5kg, polycarboxylate water-reducer 4.3kg, water 215kg.
Because example is checking property experiment, simultaneously concrete component along with time variations little, to subsequent experimental without substantial influence, therefore without the need to by concrete pouring to ten year even many decades.The 15L concrete using this proportioning to prepare after natural curing to 2 month, through fragmentation, grinding to fineness more than 400m 2mixed again after/Kg, then therefrom taken out about 1000g fine powder 2 parts respectively.Two parts of fine powders put into crucible, and in retort furnace, 1470 DEG C of calcinings were taken out after 1 hour.Material in crucible after taking-up melts completely.Material naturally cooling in a dry pot, the molten materials in another crucible is poured in previously prepd, the metal bucket of water filled fast, makes its shrend.Shrend products obtained therefrom is can the silicates gelling material of second stage employ.
Material after shrend is taken 450g add 5% potassium hydroxide and 1350g standard sand make mortar specimen, measure the anti-folding of its 28d and reach 6.0MPa, ultimate compression strength 41.5MPa.

Claims (7)

1. potassium hydroxide alkali-activated slag concrete circulation utilization method, is characterized in that, comprising:
Step one, measure the chemical composition of the reinforcement of concrete fine aggregate, coarse aggregate and alkali-activated carbonatite slag used, and by charge calculation, when being not counted in loss on ignition, make (CaO+MgO) in thick, fine aggregate and slag three kinds of solid mixtures: (SiO 2+ Al 2o 3) be greater than 1.5 and be less than 2.4, determine the mass ratio of concrete coarse aggregate, fine aggregate and slag;
Step 2, meets thick, fine aggregate and the ground slag powder of chemical constitution in step one, prepares alkali-activated carbonatite cementitious material concrete with alkali-activator potassium hydroxide after jointly mixing;
Step 3, after this concrete terminates under arms, it is broken, grinding is the powder that particle diameter is less than 80 microns, be placed on calcining also cooling fast at 1450 DEG C-1500 DEG C in calciner again, material after calcining passes through below fragmentation, grinding to 80 micron again, namely obtain new gelling material, thus the useful component in slag and coarse-fine aggregate is reused.
2. potassium hydroxide alkali-activated slag concrete circulation utilization method according to claim 1, it is characterized in that, described fine aggregate is sand, and particle diameter is less than 5mm; Described coarse aggregate is stone, and particle diameter is greater than 5mm.
3. potassium hydroxide alkali-activated slag concrete circulation utilization method according to claim 2, it is characterized in that, if the mass ratio of stone and sand is greater than 2.0, then the fragmentation of part stone is become Machine-made Sand, to guarantee that coarse aggregate and fine aggregate mass ratio are between 1.5-2.0.
4. potassium hydroxide alkali-activated slag concrete circulation utilization method according to claim 2, is characterized in that, the chemical composition (mass percent) of described sand, stone and slag is as follows:
The loss on ignition of sand: 1-2%, the SiO of the CaO of 2-5%, 60-80% 2, the Al of 10-15% 2o 3, the Fe of 2-4% 2o 3, the R of the MgO of 0-2%, 1-6% 2o, and surplus impurity;
The loss on ignition of stone: 20-35%, the SiO of the CaO of 30-40%, 10-20% 2, the Al of 1-3% 2o 3, the Fe of 0-2% 2o 3, the R of the MgO of 2-18%, 0-1.5% 2o, and surplus impurity;
The loss on ignition of slag: 1-2%, the SiO of the CaO of 40-65%, 15-25% 2, the Al of 1-5% 2o 3, the Fe of 1-8% 2o 3, the R of the MgO of 1-8%, 0-2% 2o, and surplus impurity.
5. potassium hydroxide alkali-activated slag concrete circulation utilization method according to claim 2, is characterized in that, the chemical composition (mass percent) of described sand, stone and slag is as follows:
Sand: the loss on ignition of 1.4%, the CaO of 2.61%, the SiO of 73.99% 2, the Al of 12.44% 2o 3, the Fe of 2.54% 2o 3, the MgO of 0.62%, the R of 5.3% 2o, and surplus impurity;
Stone: the loss on ignition of 29.68%, the CaO of 36.87%, the SiO of 16.17% 2, the Al of 2.34% 2o 3, the Fe of 0.696% 2o 3, the MgO of 12.56%, the R of 0.827% 2o, and surplus impurity;
Slag: the loss on ignition of 1.8%, the CaO of 62.7%, the SiO of 20.01% 2, the Al of 3.82% 2o 3, the Fe of 4% 2o 3, the MgO of 1.48%, the R of 1.2% 2o, and surplus impurity.
6. the potassium hydroxide alkali-activated slag concrete circulation utilization method according to claim 2 or 5, is characterized in that, the quality proportioning of described stone, sand and slag is 3.3:0.7:1.
7. the sodium hydroxide alkali-activated slag concrete circulation utilization method based on chemical constitution according to claim 2 or 5, is characterized in that, also add water and water reducer when preparing alkali-activated carbonatite cementitious material concrete after mixing in described step 2.
CN201410583489.XA 2014-10-27 2014-10-27 Cyclic utilization method for potassium-hydroxide alkali activated slag concrete Pending CN104402257A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101274824A (en) * 2008-05-14 2008-10-01 重庆大学 Cement clinker and preparation thereof
CN103601424A (en) * 2013-11-11 2014-02-26 长沙理工大学 Geopolymeric concrete based on recycled aggregate and preparation method of geopolymeric concrete

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101274824A (en) * 2008-05-14 2008-10-01 重庆大学 Cement clinker and preparation thereof
CN103601424A (en) * 2013-11-11 2014-02-26 长沙理工大学 Geopolymeric concrete based on recycled aggregate and preparation method of geopolymeric concrete

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Application publication date: 20150311