CN106431025A - Alkali-activated cementing material and preparation method thereof - Google Patents
Alkali-activated cementing material and preparation method thereof Download PDFInfo
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- CN106431025A CN106431025A CN201610792629.3A CN201610792629A CN106431025A CN 106431025 A CN106431025 A CN 106431025A CN 201610792629 A CN201610792629 A CN 201610792629A CN 106431025 A CN106431025 A CN 106431025A
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- alkali
- binder materials
- activated carbonatite
- aluminum
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
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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
The invention discloses an alkali-activated cementing material and a preparation method thereof, and belongs to the field of buildings. The method comprises the following steps: (1), weighing raw materials, wherein the raw materials include powder, water solution of a liquid activator and an aluminum-containing addition agent, the powder is formed by roasted bauxite separation tailing and slag powder which are mixed according to the mass ratio of (7 to 8):(3 to 2), the mass of the water solution of the liquid activator is 4 to 5% that of powder according to the mass of Na2O, the mass of the aluminum-containing addition agent is calculated according to the mass of the Na2O, the aluminum-contained addition agent is weighed, and a molar ratio between the Na2O and Al2O3 is (0.9 to 1.3):1; (2), evenly mixing the powder and the aluminum-containing addition agent to obtain a solid raw material, and evenly mixing the solid raw material with the water solution of the liquid activator to obtain the alkali-activated cementing material, wherein a mass ratio between water in the raw materials and the solid raw materials is 0.4 to 0.5. The method has the advantage of being low in alkali dissolution quantity.
Description
Technical field
The present invention relates to building field, be specifically related to a kind of alkali-activated carbonatite Binder Materials and preparation method thereof.
Background technology
Alkali-activated carbonatite Binder Materials is a kind of with sa discarded object as primary raw material, have the hydraulicity under the effect of alkali
Novel gelled material.This material is because preparation process energy consumption is low, it is low to discharge, and is provided that the property similar to cement-based gelling material
Can, therefore be considered as a kind of low-carbon (LC) Binder Materials, become Recent study focus.
Although alkali-activated carbonatite Binder Materials has numerous performance advantages such as strength development is fast, chemical resistance of concrete performance is excellent, but
It must use the alkali metal salts such as sodium metasilicate as exciting agent, and such as Na+、K+Little Deng alkali metal ion radius and be not sial
The formation body of network structure, therefore alkali metal ion easily migrates within this material.Once above-mentioned alkali metal ion is with migration of water
To material surface, easily with the CO in air2Act on and form carbonate or bicarbonate, be eventually exhibited as material surface and formed
" bloom " or " hickie ", is commonly called as " scum " or " whiting ".Not only material migrates to the alkali metal ion of material surface and easily causes
" scum ", and the alkali metal ion within sample is likely to and CO2Effect generates salt, when these salt with moisture movement to surface
After also can be formed " scum ".Therefore, " scum " becomes the typical phenomenon of alkali-activated carbonatite Binder Materials.
" scum " not only affects attractive in appearance, also can adversely affect construction.Such as, when " scum " material surface is carried out
Plaster process when, cause the decline of motar and material matrix cohesive force because of the existence of this layer loose " white ", and then cause and smear
Unsuccessful or the peeling of ash, fall slag etc..Generally, the alkali stripping quantity of alkali-activated carbonatite Binder Materials is 10%, even as high as 20%, and this
The stripping quantity of degree be enough to seriously arrive specimen surface and is covered with one layer " bloom ".Obviously, the alkali-activated carbonatite Binder Materials of usual ingredients
All there is serious " scum " phenomenon.Additionally, " scum " of alkali-activated carbonatite Binder Materials is solvable carbonate, through rain
Rear alkali metal ion can enter local water body and soil, and then is possible to cause local water pollution or the salinization of soil.Especially
It is to be used as outer wall material or during for field engineering, the potential risk of this environmental pollution can not be neglected when alkali-activated carbonatite Binder Materials
Slightly.In view of " scum " adverse effect to material appearance, workability and environment, the alkali leaching retention of alkali-activated carbonatite gelling becomes it
The important content that performance optimizes.
Content of the invention
It is an object of the invention to provide a kind of alkali-activated carbonatite Binder Materials and preparation method thereof, the inventive method is contained by interpolation
Additive containing aluminium makes to occur aluminium to be polymerized by this sial as charge balance ion for silicon, alkali metal ion in the skeleton structure of gel
Structure is bonded, and then reaches to limit the purpose of alkali ion movement, finally weakens alkali-activated carbonatite Binder Materials " scum " phenomenon
Occur.
It is an object of the invention to be achieved through the following technical solutions：
On the one hand, embodiments provide the preparation method of a kind of alkali-activated carbonatite Binder Materials, comprise the steps：
(1) raw material is weighed：Described raw material includes powder, the aqueous solution of liquid exciting agent and aluminum-containing additive, wherein, institute
The powder stated is that to select mine tailing and slag powders be 7-8 according to mass ratio to calcined bauxite：3-2 mixes, and described liquid excites
The aqueous solution of agent is with Na2O mass is calculated as the 4-5% of the quality of described powder, according to Na2The Mass Calculation of O weighing adds containing aluminium
Add the quality of agent, described middle Na2O and Al2O3Mol ratio be 0.9-1.3：1；
(2) described powder and aluminum-containing additive are uniformly mixed so as to obtain solid material, described solid material and liquid are swashed
The aqueous solution sending out agent is uniformly mixed so as to obtain described alkali-activated carbonatite Binder Materials；
In described raw material, water and the mass ratio of described solid material are 0.4-0.5.
Further, maintenance under normal temperature after described solid material being mixed with liquid exciting agent.
Further, described aluminum-containing additive is metakaolin, activity index >=100 of described metakaolin, 45 μ
M square hole screen tails over≤20.0%.
Further, carrying out maintenance after mixing the aqueous solution of described solid material and liquid exciting agent, first normal temperature is supported
Protecting 20-30h, then maintenance 20-30h under the conditions of 60-100 DEG C, finally carries out normal temperature maintenance.
Further, described aluminum-containing additive is amorphous alumina；45 μm of square hole screens of described amorphous alumina
Tail over≤20.0%.
Further, described aluminum-containing additive is aluminate cement, Al in described aluminate cement2O3Percent mass contains
Amount is 50-80%, described aluminate cement mass fraction≤5% shared in described raw material.
On the other hand, embodiments providing a kind of alkali-activated carbonatite Binder Materials, described Binder Materials is by above-mentioned
Preparation method is prepared.
Compared with prior art, alkali-activated carbonatite Binder Materials of the present invention and preparation method thereof at least possesses following advantage：
The present patent application method optimizes powder (calcining alum clay selects mine tailing and slag powders), waterglass and aluminum-containing additive
Addition, not only ensure that the intensity of Binder Materials but also can effectively suppress its alkali dissolution.
The present patent application is based on SiQ4(mAl) bonding to alkali metal ion for the structure, introduces in alkali-activated carbonatite Binder Materials
Rich al composition, makes to occur aluminium to be gathered by this sial as charge balance ion for silicon, alkali metal ion in the skeleton structure of gel
Close structure bonding, and then reach to limit the purpose of alkali ion movement, finally weaken alkali-activated carbonatite Binder Materials " scum " phenomenon
Generation.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, but not as a limitation of the invention.
The principle of the present invention：The hydrated product of alkali-activated carbonatite Binder Materials is with [SiO4]4-For building block links
Chain or the gel of three-dimensional network-like structure.When in the raw material of alkali-activated carbonatite Binder Materials rich in aluminium, because of aluminium generation in gel structure
The generation of silicon and different types of gel may be obtained, and affect the mechanical property of material.For example, at metakaolin (rich in silicon
Aluminium) etc. system is added amorphous alumina or aluminum contained compound, form [Al because aluminium is dissolved in aqueous slkali under normal temperature condition
(OH)4]-, increase [Al (OH) in solution4]-Quantity, thus promote sial polymerisation, and it is possible to generate in early days N-A-S-
H gel (N=Na, A=Al, S=Si, H=H2O).It in addition, one can be obtained by the consumption of adjustment metakaolin and waterglass is
The Binder Materials of row Si/Al ratio.Within this material, when Si/Al is relatively low, Al all can not participate in polymerisation and have more than needed in
In solution, probe intensity is on the low side；But when Si/Al ratio improves to 5, Al fully enters in sial skeleton structure, correspondingly obtains
Fine and close microstructure.This mixing in aluminium and high Si/Al ratio system above-mentioned, sial polymerisation generates the structure list of gel
Unit is [SiO4]4-[AlO4]5-, i.e. because aluminium makes the three-dimensional net structure of silicon-oxy tetrahedron be changed into SiQ for the generation of silicon4
(mAl).This negative electrical charge that will make to have more than needed in structure that replaces, and Na+Knot exactly can be made as charge balance ion
Structure keeps electroneutral.Therefore, under the premise of not affected because composition change in performances such as the guarantee strengths of materials, if mixing containing aluminium
Component simultaneously strictly regulates and controls the composition parameter such as Al/Si ratio, Na/Al ratio, obtains the " complete of Na/Al ≈ 1 according to silica-alumina gel structure
Beautiful " (i.e. once one silicon position of generation is replaced composition by aluminium, exactly a corresponding Na+Balancing charge), Na+Will be by SiQ4(mAl)
Structure is bonded and limits it and migrate, and then reaches to suppress the purpose of alkali dissolution.
Based on above-mentioned [SiO4]4-[AlO4]5-The bonding mechanism of construction unit, the present invention devises at alkali-activated carbonatite gelling material
Material introduces the scheme of the aluminum-containing additives such as metakaolin, makes gel structure be changed into SiQ4, and then make easily to migrate (mAl)
Alkali metal ion is bonded by sial paradigmatic structure as charge balance ion, is finally reached effectively suppression alkali-activated carbonatite Binder Materials
Alkali dissolution and the impregnable purpose of material mechanical performance, this is clearly advantageous to the popularization and application of alkali-activated carbonatite Binder Materials.
The alkali dissolution of alkali-activated carbonatite Binder Materials is in addition to alkali metal ion easily migrates this deciding factor, it is also possible to come from
Excessive alkali, therefore designs and not only has sufficient intensity but also alkali-activated carbonatite Binder Materials that alkali consumption is appropriate is to its alkali leaching retention
Basis.To this end, use the formula of orthogonal method design alkali-activated carbonatite Binder Materials, select using intensity and stripping quantity as formula
Foundation.
Effect for making addition aluminum-containing additive is more preferable, and intensity and sample stripping quantity with alkali-activated carbonatite Binder Materials are below
Index, is optimized to the addition of powder and waterglass：
Mine tailing (hereinafter referred to as mine tailing) and slag powders is selected to prepare as raw material, waterglass as exciting agent using calcined bauxite
Alkali-activated carbonatite Binder Materials.According to《Test method for strength of hydraulic cement mortar (ISO method)》(GB/T 17671) prepares sample, measures by force
Degree, but the humid air that curing condition is normal temperature (RH=95 ± 5%).It when sample maintenance is to after setting age, is transferred to 500ml
Soaking 14 days in deionized water, the distance on liquid level test coupon surface is not less than 1cm.Immersion measures alkali gold in soak after terminating
Belong to the content of ion, and then calculate its stripping quantity.
3 factor 4 water-glasses that table 1 is orthogonal design, the intensity that table 2 is each formula and alkali stripping quantity, table 3 divides for extreme difference
Analysis.
Table 1
Note：The composite granule that powder is constituted with slag powders for calcining mine tailing.Calcining mine tailing consumption is 70% expression composite powder
The mass percent calcining mine tailing in body is 70%, and the mass percent of slag powders is 30%.
Table 2
Table 3
According to result it is recognized that while alkali-activated carbonatite is swift in response, when 3 days, sample just has been provided with sufficiently high intensity, but now
Structural development is insufficient, yet suffers from the obvious passage of alkali ion movement in hardenite, and therefore its alkali stripping quantity is substantially inclined
High.When sample is after maintenance in 28 days, because the sample that persistently carries out of alkali-activated carbonatite reaction becomes finer and close, correspondingly alkali stripping quantity is obvious
Decline.Know according to 28 days sample extreme difference results, affect the factor of sample alkali dissolution by weak ordering being by force：Modulus of water glass>Water
Glass volume>Mine tailing volume.According to the above results, considering from alkali leaching retention angle, when preparing sample, modulus of water glass is higher
Better, waterglass consumption is more low better, and mine tailing consumption is more few better.For different modulus waterglass, its modulus is higher, alkali metal
Content is lower, and this reduces the dissolution risk of alkali metal ion undoubtedly；Exciting agent consumption is lower, and i.e. in sample, alkali metal content is got over
Low, correspondingly sample dissolution is lower；Mine tailing consumption is fewer, and the consumption of this active higher component of slag is more, and this obviously has
Being beneficial to alkali-activated carbonatite reaction, correspondingly sample can form compact texture, and then the dissolution of suppression alkali metal ion.Tie according to dissolution
Really, the optimization formula obtaining is：70% mine tailing+30% slag powders+2% waterglass is (with Na2O counts, and accounts for the matter of mine tailing and slag powders
Amount percentage；Modulus is 2.2).
As Binder Materials, its intensity is its basic performance, and therefore the intensity of sample is the performance of overriding concern.According to molten
Going out result, the waterglass consumption of corresponding more excellent formula is more low better, but understands that waterglass consumption is more high better according to intensity, and two
Person is conflicting.This contradiction reason is caused to be：Waterglass consumption low then alkali dissolution risk is low as previously mentioned, but waterglass consumption
Too low, alkali-activated carbonatite reaction is suppressed, then improves waterglass consumption and is clearly advantageous to sa dissolution of raw material, sial monomer
Polymerization, i.e. sample has higher intensity because sufficient alkali-activated carbonatite reacts.
On the premise of the two contradiction each other, pay the utmost attention to probe intensity, but select the low formula of alkali dissolution as far as possible.Based on
This principle, more excellent formula is set as：70-80% mine tailing+20-30% slag powders+4-5% waterglass is (with Na2O counts, and accounts for mine tailing
And the mass percent of slag powders；Modulus is 1.8-2.2).
According to above-mentioned proportion optimizing, further illustrate the present invention with specific embodiment below.In the following embodiments, all with
Calcined bauxite select mine tailing (hereinafter referred to as mine tailing) and slag powders as raw material, waterglass as exciting agent as a example by.
The preparation method of a kind of alkali-activated carbonatite Binder Materials that the embodiment of the present invention provides, comprises the steps：
(1) raw material is weighed：Described raw material includes powder, the aqueous solution of liquid exciting agent and aluminum-containing additive, wherein, institute
The powder stated is that to select mine tailing and slag powders be 7-8 according to mass ratio to calcined bauxite：3-2 mixes, and described liquid excites
The aqueous solution of agent is with Na2O mass is calculated as the 4-5% of the quality of described powder, according to Na2The Mass Calculation of O weighing adds containing aluminium
Add the quality of agent, described middle Na2O and Al2O3Mol ratio be 0.9-1.3：1；
(2) described powder and aluminum-containing additive are uniformly mixed so as to obtain solid material, described solid material and liquid are swashed
The aqueous solution sending out agent is uniformly mixed so as to obtain described alkali-activated carbonatite Binder Materials；
In described raw material, water and the mass ratio of described solid material are 0.4-0.5.
Above scheme can complete the preparation of alkali-activated carbonatite Binder Materials, herein below on the basis of provide preferred version：
As preferably, by maintenance under normal temperature after described solid material and the mixing of liquid exciting agent.
As preferably, described aluminum-containing additive is metakaolin, activity index >=100 of described metakaolin, 45 μ
M square hole screen tails over≤20.0%.
As preferably, carrying out maintenance after mixing the aqueous solution of described solid material and liquid exciting agent, first normal temperature is supported
Protecting 20-30h, then maintenance 20-30h under the conditions of 60-100 DEG C, finally carries out normal temperature maintenance.
As preferably, described aluminum-containing additive is amorphous alumina；45 μm of square hole screens of described amorphous alumina
Tail over≤20.0%.
As preferably, described aluminum-containing additive is aluminate cement, Al in described aluminate cement2O3Percent mass contains
Amount is 50-80%, described aluminate cement mass fraction≤5% shared in described raw material.
Specific embodiment is presented herein below：
Embodiment 1
Table 4 is for mixing alkali stripping quantity and the intensity thereof of sample after the metakaolin of rich aluminium.Binder Materials proportioning is 70% tail
Ore deposit+30% slag powders+5% waterglass is (with Na2O counts, and accounts for the mass percent of mine tailing and slag powders；Modulus is 2.2)
Table 4
From result, mix metakaolin because bringing more aluminium into so that Si/Al ratio, the Na/Al ratio of sample gradually drop
Low, Na/Al ratio even can be made to be nearly equal to 1.Assuming that the aluminium in metakaolin can discharge under the conditions of alkali-activated carbonatite, and all enter
Sial paradigmatic structure, then negative electrical charge unnecessary in structure will be by bonding Na+Reaching balance, alkali stripping quantity reduces accordingly.
But the fact is but completely contrary, after mixing metakaolin, the alkali stripping quantity of sample increased on the contrary, and intensity is also with volume
Increase and be gradually reduced.This result means that metakaolin can not discharge aluminium completely, and aluminium can not be by replacing in other words
Silicon position and completely into sial bonding structure.Pertinent literature shows, the rich aluminum feedstock such as metakaolin, flyash, at normal temperature
Under condense when preparing sial system Binder Materials abnormal slowly, this illustrates its structural deterioration, discharges this process of aluminium at normal temperatures
Slowly, say, that metakaolin participates in the limitation of alkali-activated carbonatite reaction at normal temperatures.On the other hand, gather at silicon-oxy tetrahedron
Closing in structure, being not that each silicon position can be replaced by aluminium, the silicon being only positioned in bridge silicon-oxy tetrahedron is only possible to occur
Replace.Typically, there occurs aluminium in the sial paradigmatic structure of silicon, Al/Si is not more than 0.2, therefore aluminium replace silicon number
Amount has the upper limit.According to foregoing description understand mix metakaolin after alkali stripping quantity rise on the contrary, intensity decline on the contrary the reason：Cause
Metakaolin participates in the limitation of alkali-activated carbonatite reaction, i.e. waterglass is had more than needed more, and therefore alkali stripping quantity increases with volume and increases
Adding, the especially early stage alkali stripping quantity increase at the more waterglass of residue becomes apparent from；Even if metakaolin can discharge aluminium, but
And mean to occur aluminium for silicon, even if therefore under conditions of Na/Al is close to 1, alkali stripping quantity is still higher；Just because of partially
Kaolin participates in the limitation of alkali-activated carbonatite reaction at normal temperatures, i.e. active component in sample tails off so that the intensity of sample
Decrease.
In order to promote sial polymerisation, promote aluminium for the generation of silicon, it is necessary to improve the maintenance of alkali-activated carbonatite Binder Materials
Temperature.The conservation system taked is form removal after normal temperature maintenance 24 hours, inserts maintenance 24 hours in hot environment, finally inserts again
Under normal temperature condition, maintenance is to setting age.
Table 5 is the alkali stripping quantity of Binder Materials after the different conservation system of experience.Binder Materials proportioning is 70% mine tailing+30%
Slag powders+5% waterglass is (with Na2O counts, and accounts for the mass percent of mine tailing and slag powders；Modulus is 2.2)
Table 5
From result, improve curing temperature and can significantly reduce the alkali dissolution of sample, and the more high this suppression of curing temperature
Act on more obvious.This is because under the conditions of High Temperature Curing, promote dissolving in alkaline solution for the metakaolin, and promote
Aluminium of its release participates in alkali-activated carbonatite reaction, i.e. the aluminium in the extent of reaction of metakaolin and sial paradigmatic structure for silicon degree with
When be promoted, the degree that therefore sodium ion is bonded by sial paradigmatic structure is strengthened, and its dissolution is suppressed.On the other hand, by
In the promotion to alkali-activated carbonatite for the High Temperature Curing so that sample just has the higher extent of reaction, i.e. gel in sample in early days
More, correspondingly sample is finer and close, and this is favourable to sealing alkali metal ion.According to the present embodiment, mixing 10%
Under conditions of metakaolin, the raising alkali leaching retention effect with curing temperature is better, but during higher than 100 DEG C, water will seethe with excitement, no
Being beneficial to operation, therefore the optimum range of High Temperature Curing is 60～100 DEG C.
Embodiment 2
According to embodiment 1 result, if quickly discharge aluminium be mix component can suppress alkali dissolution key it
One.Therefore, can be selected for soluble aluminum hydrochlorate at normal temperatures and reach quickly to discharge the purpose of aluminium.Need owing to generating gel again
Calcium, therefore can be selected for calcium aluminate.In several calcium aluminates, monocalcium aluminate has hydration activity, is the main one-tenth of aluminate cement
Point.Therefore, can be selected for aluminate cement at normal temperatures as modified component.
Table 6 is for mixing the inhibition to Binder Materials alkali dissolution for a small amount of aluminate cement.Binder Materials proportioning is 70%
Mine tailing+30% slag powders+5% waterglass is (with Na2O counts, and accounts for the mass percent of mine tailing and slag powders；Modulus is 2.2)
Table 6
From result, mix aluminate cement and substantially can reduce the alkali stripping quantity of sample, the alkali stripping quantity of 28 days samples
Even can be reduced to less than 8%.This reduction effect can quickly participate in alkali-activated carbonatite reaction just because of calcium aluminate so that sial
Paradigmatic structure can be bonded sodium ion.But, when aluminate cement volume is too much, the alkali stripping quantity of sample gos up again.?
Finding when prepared by sample, when high additive, slurry condenses quickly, even impact shaping.This fast solidifying there is a possibility that in sample retains
More macropore, i.e. sample porosity is higher, and this is conducive to alkali metal ion dissolution undoubtedly.According to the present embodiment, aluminate cement
Volume no more than 5% (accounting for the mass percent of powder).
By this it was found that aluminate cement has excellent rush coagulates effect, even have little time when its volume is 10%
Measure the presetting period.Exactly because this fast solidifying, make the intensity of sample reduce when high additive.According to the present embodiment result,
The volume of aluminate cement is no more than 5%, and this is consistent with alkali dissolution experimental result.
Embodiment 3
Owing in sial polymerisation, aluminium is necessary component, and in order to occur aluminium to also require that offer aluminium for silicon.Said process
The premise that can carry out is exactly that aluminium can enter solution, and exists with monomeric form.Pertinent literature shows, nano-aluminium oxide
Deng ultra-fine grain, there is certain chemical action, but too slow relative to this effect of the quick alkali-activated carbonatite occurring reaction, and this is right
Sample alkali leaching retention is without positive effect.To this end, can be selected for highly active amorphous alumina as aluminium source.
Table 7 is for mixing the inhibition to Binder Materials alkali dissolution for the amorphous alumina.Binder Materials proportioning is 70% tail
Ore deposit+30% slag powders+5% waterglass is (with Na2O counts, and accounts for the mass percent of mine tailing and slag powders；Modulus is 2.2)
Table 7
As shown in table 7, mix activated alumina and really can reduce alkali stripping quantity, this is because aluminium enters sial polymerization knot
Structure and strengthen the bonding to alkali metal ion.But this reduction effect is not gradually strengthened with the increase of aluminum oxide volume,
But there is limiting value.After Na/Al is close to 1, the alkali stripping quantity change of sample is little, i.e. now aluminium for the stagnant sodium of silicon ability
Extremely ultimate attainment through playing.For the intensity of sample, early anaphase Strength Changes is different.[SiO in the solutionn(OH)4-n]n-(come from water
Glass) sufficient on the premise of, aluminium Fast Stripping in early days can form rich alumina gel, and this is favourable to improving early strength；But it is former
Material particle makes its dissolvings be obstructed because of the parcel of rich alumina gel, and then affects later strength and develop, this table in the present embodiment
It is now that 28 days intensity is almost unchanged.According to the present embodiment result, amorphous alumina is alkali-activated carbonatite Binder Materials alkali leaching retention
Optional component.
Embodiment 4
The 1st, embodiment 2 and 3 confirms " 70% mine tailing+30% slag powders+5% waterglass is (with Na2O counts, and accounts for mine tailing and ore deposit
The mass percent of ground-slag；Modulus is 2.2) " under the conditions of, mixing metakaolin, aluminate cement and amorphous alumina can have
Effect suppresses the alkali dissolution of sample, and sample still has higher-strength.The present embodiment more excellent adds according to what previous embodiment determined
It under the conditions of adding agent volume, is further characterized by the alkali leaching retention effect to different ratio Binder Materials for the above-mentioned additive.
Table 8 is for mixing the inhibition to Binder Materials alkali dissolution for the amorphous alumina.Binder Materials proportioning is 70% tail
Ore deposit+30% slag powders+5% waterglass is (with Na2O counts, and accounts for the mass percent of mine tailing and slag powders；Modulus is 1.8).
Table 8
Note：When * adding metakaolin, form removal after sample normal temperature maintenance 24 hours, insert maintenance 24 hours in 60 DEG C of environment,
Last insert under normal temperature condition maintenance again to setting age.
Embodiment 5
The 1st, embodiment 2 and 3 confirms " 70% mine tailing+30% slag powders+5% waterglass is (with Na2O counts, and accounts for mine tailing and ore deposit
The mass percent of ground-slag；Modulus is 2.2) " under the conditions of, mixing metakaolin, aluminate cement and amorphous alumina can have
Effect suppresses the alkali dissolution of sample, and sample still has higher-strength.The present embodiment more excellent adds according to what previous embodiment determined
It under the conditions of adding agent volume, is further characterized by the alkali leaching retention effect to different ratio Binder Materials for the above-mentioned additive.
Table 9 is for mixing the inhibition to Binder Materials alkali dissolution for the amorphous alumina.Binder Materials proportioning is 70% tail
Ore deposit+30% slag powders+4% waterglass is (with Na2O counts, and accounts for the mass percent of mine tailing and slag powders；Modulus is 1.8).
Table 9
Note：When * adding metakaolin, form removal after sample normal temperature maintenance 24 hours, insert maintenance 24 hours in 60 DEG C of environment,
Last insert under normal temperature condition maintenance again to setting age.
Embodiment 6
The 1st, embodiment 2 and 3 confirms " 70% mine tailing+30% slag powders+5% waterglass is (with Na2O counts, and accounts for mine tailing and ore deposit
The mass percent of ground-slag；Modulus is 2.2) " under the conditions of, mixing metakaolin, aluminate cement and amorphous alumina can have
Effect suppresses the alkali dissolution of sample, and sample still has higher-strength.The present embodiment more excellent adds according to what previous embodiment determined
It under the conditions of adding agent volume, is further characterized by the alkali leaching retention effect to different ratio Binder Materials for the above-mentioned additive.
Table 10 is for mixing the inhibition to Binder Materials alkali dissolution for the amorphous alumina.Binder Materials proportioning is 80% tail
Ore deposit+20% slag powders+5% waterglass is (with Na2O counts, and accounts for the mass percent of mine tailing and slag powders；Modulus is 2.2).
Table 10
Note：When * adding metakaolin, form removal after sample normal temperature maintenance 24 hours, insert maintenance 24 hours in 70 DEG C of environment,
Last insert under normal temperature condition maintenance again to setting age.
Embodiment 7
The 1st, embodiment 2 and 3 confirms " 70% mine tailing+30% slag powders+5% waterglass is (with Na2O counts, and accounts for mine tailing and ore deposit
The mass percent of ground-slag；Modulus is 2.2) " under the conditions of, mixing metakaolin, aluminate cement and amorphous alumina can have
Effect suppresses the alkali dissolution of sample, and sample still has higher-strength.The present embodiment more excellent adds according to what previous embodiment determined
It under the conditions of adding agent volume, is further characterized by the alkali leaching retention effect to different ratio Binder Materials for the above-mentioned additive.
Table 11 is for mixing the inhibition to Binder Materials alkali dissolution for the amorphous alumina.Binder Materials proportioning is 80% tail
Ore deposit+20% slag powders+5% waterglass is (with Na2O counts, and accounts for the mass percent of mine tailing and slag powders；Modulus is 1.8).
Table 11
Note：When * adding metakaolin, form removal after sample normal temperature maintenance 24 hours, insert maintenance 24 hours in 80 DEG C of environment,
Last insert under normal temperature condition maintenance again to setting age.
Above example is only the exemplary embodiment of the present invention, is not used in the restriction present invention, protection scope of the present invention
It is defined by the claims.The present invention can be made respectively in the essence of the present invention and protection domain by those skilled in the art
Planting modification or equivalent, this modification or equivalent also should be regarded as being within the scope of the present invention.
Claims (7)
1. the preparation method of an alkali-activated carbonatite Binder Materials, it is characterised in that comprise the steps：
(1) raw material is weighed：Described raw material includes powder, the aqueous solution of liquid exciting agent and aluminum-containing additive, wherein, described
Powder is that to select mine tailing and slag powders be 7-8 according to mass ratio to calcined bauxite：3-2 mixes, described liquid exciting agent
The aqueous solution is with Na2O mass is calculated as the 4-5% of the quality of described powder, according to Na2The Mass Calculation of O simultaneously weighs aluminum-containing additive
Quality, described middle Na2O and Al2O3Mol ratio be 0.9-1.3：1；
(2) described powder and aluminum-containing additive are uniformly mixed so as to obtain solid material, by described solid material and liquid exciting agent
The aqueous solution be uniformly mixed so as to obtain described alkali-activated carbonatite Binder Materials；
In described raw material, water and the mass ratio of described solid material are 0.4-0.5.
2. the preparation method of alkali-activated carbonatite Binder Materials according to claim 1, it is characterised in that by described solid material
Maintenance under normal temperature after mixing with liquid exciting agent.
3. the preparation method of alkali-activated carbonatite Binder Materials according to claim 1, it is characterised in that described aluminum-containing additive
For metakaolin, activity index >=100 of described metakaolin, 45 μm of square hole screens tail over≤20.0%.
4. the preparation method of alkali-activated carbonatite Binder Materials according to claim 1, it is characterised in that by described solid material
Carry out maintenance with the aqueous solution of liquid exciting agent, first normal temperature maintenance 20-30h, then maintenance 20-under the conditions of 60-100 DEG C after mixing
30h, finally carries out normal temperature maintenance.
5. the preparation method of alkali-activated carbonatite Binder Materials according to claim 1, it is characterised in that described aluminum-containing additive is
Amorphous alumina；45 μm of square hole screens of described amorphous alumina tail over≤20.0%.
6. the preparation method of alkali-activated carbonatite Binder Materials according to claim 1, it is characterised in that described aluminum-containing additive is
Aluminate cement, Al in described aluminate cement2O3Weight/mass percentage composition is 50-80%, and described aluminate cement is described
Raw material in shared mass fraction≤5%.
7. an alkali-activated carbonatite Binder Materials, it is characterised in that described Binder Materials is by described in any one in claim 1-6
Preparation method be prepared.
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| CN108129081A (en) * | 2017-12-26 | 2018-06-08 | 北方民族大学 | A kind of high temperature resistant complex cement sill and preparation method thereof |
| CN109437614A (en) * | 2018-12-29 | 2019-03-08 | 中国建筑材料科学研究总院有限公司 | The alkali-activated carbonatite cementitious material and preparation method thereof of the low alkali soluble output of room temperature maintenance |
| CN109437688A (en) * | 2018-12-06 | 2019-03-08 | 湖南易兴建筑有限公司 | Nano inorganic mineral material and preparation method thereof and concrete |
| CN111393054A (en) * | 2020-03-20 | 2020-07-10 | 景德镇陶瓷大学 | Low-alkali-excitation water-resistant geopolymer material, preparation method thereof and application thereof in building decorative plate |
| CN111454011A (en) * | 2020-03-25 | 2020-07-28 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Method for preparing alkali-activated cementing material by utilizing engineering muck and alkali-activated cementing material |
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| CN108129081A (en) * | 2017-12-26 | 2018-06-08 | 北方民族大学 | A kind of high temperature resistant complex cement sill and preparation method thereof |
| CN109437688A (en) * | 2018-12-06 | 2019-03-08 | 湖南易兴建筑有限公司 | Nano inorganic mineral material and preparation method thereof and concrete |
| CN109437614A (en) * | 2018-12-29 | 2019-03-08 | 中国建筑材料科学研究总院有限公司 | The alkali-activated carbonatite cementitious material and preparation method thereof of the low alkali soluble output of room temperature maintenance |
| CN109437614B (en) * | 2018-12-29 | 2021-08-31 | 中国建筑材料科学研究总院有限公司 | Normal-temperature-cured alkali-activated cementing material with low alkali dissolution amount and preparation method thereof |
| CN111393054A (en) * | 2020-03-20 | 2020-07-10 | 景德镇陶瓷大学 | Low-alkali-excitation water-resistant geopolymer material, preparation method thereof and application thereof in building decorative plate |
| CN111393054B (en) * | 2020-03-20 | 2022-07-05 | 景德镇陶瓷大学 | Low-alkali-excitation water-resistant geopolymer material, preparation method thereof and application thereof in building decorative plate |
| CN111454011A (en) * | 2020-03-25 | 2020-07-28 | 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) | Method for preparing alkali-activated cementing material by utilizing engineering muck and alkali-activated cementing material |
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