CN108947287A - Controlling low-intensity backfill cementing material containing red mud and preparation method thereof - Google Patents
Controlling low-intensity backfill cementing material containing red mud and preparation method thereof Download PDFInfo
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- CN108947287A CN108947287A CN201810954278.0A CN201810954278A CN108947287A CN 108947287 A CN108947287 A CN 108947287A CN 201810954278 A CN201810954278 A CN 201810954278A CN 108947287 A CN108947287 A CN 108947287A
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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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/141—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step
-
- 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
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
Abstract
A kind of controlling low-intensity backfill cementing material containing red mud, include solid material composition and alkali activating solution, the solid material composition includes red mud and inorganic particle, the inorganic particle includes blast-furnace cinder and flyash, the alkali activating solution includes alkali metal hydroxide, alkali silicate, alkali metal aluminate and water, wherein, the weight ratio of the alkali activating solution and the solid material composition is between 0.2 to 0.6, it is counted with the weight percent that the solid material forms for 100wt%, the content of the red mud is between 60wt% to 80wt%, the silica of the alkali activating solution and the molar ratio of alkali metal oxide are between 0.8 to 1.5, the molar ratio of silica and aluminium oxide is between 50 to 100, and the alkali activating solution and the solid material form mixed total moisture content between 40wt% to 8 0wt%.In addition, the preparation method for the controlling low-intensity backfill cementing material that the present invention also provides a kind of containing red mud.
Description
Technical field
The present invention relates to a kind of backfill cementing material, and preparation method thereof, more particularly to a kind of controlling containing red mud
Low-intensity backfills cementing material and preparation method thereof.
Background technique
Red mud is the strong basicity solid waste of aluminum oxide industry production process discharge, average 1 ton of oxidation of every production
Aluminium, big appointment incidentally generate 1.0~2.0 tons of red muds.Red mud is due to complicated composition and has high sodium, aluminium content and high alkalinity, money
Sourceization utilizes hardly possible.Therefore, for a long time, discarded outlet red mud be mostly in a manner of stockpiling based on, not only contamination accident takes place frequently,
And the environmentally safe influence for having promise big.Therefore, the recycling of the disposition of red mud and red mud regenerates, and is always that related dealer is positive
The direction of effort.
Summary of the invention
The purpose of the present invention is to provide a kind of, and the controlling low-intensity containing red mud backfills cementing material.
Controlling low-intensity of the present invention containing red mud backfills cementing material, includes: Gu material composition and alkali activating solution.
The solid material composition includes red mud and inorganic particle, and the inorganic particle includes blast-furnace cinder and flyash, described
Alkali activating solution includes alkali metal hydroxide, alkali silicate, alkali metal aluminate and water, wherein the alkali activating solution with
The weight ratio of the solid material composition is counted between 0.2 to 0.6 with the weight percent that the solid material forms for 100wt%, described
The content of red mud is situated between 60wt% to 80wt%, the silica of the alkali activating solution and the molar ratio of alkali metal oxide
In 0.8 to 1.5, the molar ratio of silica and aluminium oxide is between 50 to 100, and the alkali activating solution and the solid material form
Mixed total moisture content is between 40wt% to 80wt%.
Preferably, the controlling low-intensity of the present invention containing red mud backfills cementing material, wherein the alkali activating solution
Sodium hydroxide molar concentration is between 3M to 8M.
Preferably, the controlling low-intensity of the present invention containing red mud backfills cementing material, wherein the inorganic particle is also
Including carbide slag, clay or an aforementioned wherein combination.
Preferably, controlling low-intensity of the present invention containing red mud backfills cementing material, wherein the blast-furnace cinder and
The weight ratio of flyash is between 3:1 to 1:1.
Preferably, the controlling low-intensity of the present invention containing red mud backfills cementing material, wherein the solid material composition is also
Comprising aggregate, the aggregate is selected from river sand, stone, artificial aggregate, steel slag, construction waste or an aforementioned wherein combination, and institute
State 5 times that the additive amount of aggregate is formed no more than the solid material.
Preferably, the controlling low-intensity of the present invention containing red mud backfills cementing material, wherein the controlling is low strong
7 day compression strength of the degree backfill cementing material after solidification are not less than 0.9MPa.
Preferably, controlling low-intensity of the present invention containing red mud backfills cementing material, wherein the blast-furnace cinder and
The weight ratio of flyash is greater than 3:1 to 1:1, and 28 day resistance to compressions of the controlling low-intensity backfill cementing material after solidification
Intensity is not less than 5MPa.
Another object of the present invention is to provide a kind of, and the controlling low-intensity containing red mud backfills the preparation side of cementing material
Method.
The preparation method of controlling low-intensity backfill cementing material of the present invention containing red mud, comprises the steps of.
Prepare the controlling low-intensity containing red mud as previously described and backfills cementing material.
The red mud is subjected to precomminution processing, obtains the first pre-dispersed object.
Then, the first pre-dispersed object is puddled with the inorganic particle and alkali activating solution, pre-composition slurry can be obtained.
Preferably, the preparation method of the controlling low-intensity backfill cementing material of the present invention containing red mud, wherein described
First pre-dispersed object is after red mud is carried out precomminution processing, further that precomminution treated red mud and partial alkali is living
Change red mud slurry obtained by after liquid is puddled, and the weight ratio of the red mud of the first pre-dispersed object and alkali activating solution between 1.5:1 extremely
5:1, the pre-composition slurry are obtained after puddling the first pre-dispersed object and inorganic particle and the remaining alkali activating solution.
Preferably, the preparation method of the controlling low-intensity backfill cementing material of the present invention containing red mud, wherein described
Controlling low-intensity backfill cementing material containing red mud also includes aggregate, and the pre-composition slurry is by the first pre-dispersed object and nothing
Machine powder, aggregate and the remaining alkali activating solution obtain after puddling.
Beneficial effect of the invention is: being main raw material sources using red mud, collocation blast-furnace cinder and flyash are
Auxiliary material, and cooperate the composition and ratio of alkali activating solution, and obtaining one can fit in room temperature curing and with appropriate compression strength
Controlling low-intensity for general stemming operation backfills cementing material (CLSM).
Detailed description of the invention
Fig. 1 is the text flow chart for illustrating controlling low-intensity backfill cementing material method of the preparation present invention containing red mud.
Specific embodiment
By accompanying drawings and embodiments, the present invention is described in detail below.
The present invention containing red mud controlling low-intensity backfill cementing material (Control Low Strength Material,
CLSM) embodiment includes solid material composition and alkali activating solution.
The solid material composition includes red mud and inorganic particle.
Specifically, the red mud is alumina producer alkaline waste caused by refining alumina process, and appearance is in
Russet.Mode currently used for producing aluminium oxide has sintering process, Bayer process and combination method, and produces and aoxidize in the method
The waste being discharged after aluminium, i.e., general so-called red mud from sintering process, Bayer process or combination method red mud.Wherein, Bayer process red mud
Because of low silicon, low calcium and the mineralogical composition dicalcium silicate (2CaOSiO for being free of general Portland clinker2), activity is lower,
Red mud suitable for the embodiment of the present invention includes red mud from sintering process, Bayer process red mud or combination method red mud.
The inorganic particle includes blast-furnace cinder, and with flyash, the flyash can be burned-coal fly ash, coal-fired bottom ash.
In some embodiments, the inorganic particle also can further include clay, other clinkers (carbide slag), slag,
Volcanic ash, clay or a wherein combination above-mentioned.
The alkali activating solution includes alkali metal hydroxide, alkali silicate, alkali metal aluminate and water, the alkali gold
Belong to aluminate and be such as, but not limited to sodium aluminate or potassium aluminate, the alkali metal hydroxide and alkali silicate are for example but unlimited
In sodium metasilicate, potassium silicate and sodium hydroxide, potassium hydroxide.And counted with the weight percent that the solid material forms for 100wt%,
The content of the red mud is between 60wt% to 80wt%, the silica (SiO of the alkali activating solution2) and alkali metal oxide
(M2O molar ratio (alkali modulus, SiO)2/M2O, M are alkali metal element) between 0.8-1.5, silica (SiO2) and oxidation
Aluminium (Al2O3) molar ratio (SiO2/Al2O3) between 50-100, the weight ratio of the alkali activating solution and solid material composition (liquid/
Gu ratio) between 0.2-0.6.
In addition, it is noted that due to general red mud moisture content about 20 to 25%, need to consider the alkali activating solution
With the mixed whole water content of solid material composition, to avoid because total moisture content it is excessively high caused by viscosity it is too low caused by application property it is bad
The shortcomings that, therefore, also further control enables the alkali activating solution and the mixed total moisture content of the solid material composition be situated between to the present invention
In 40wt% to 80wt%.
In some embodiments, the controlling low-intensity backfill cementing material containing red mud also can further include aggregate
To promote integral construction operating characteristics (degree of collapsing and the mobility that collapses).The aggregate can be selected from the natural river sand, stone, people of different gradation
Make aggregate, steel slag, construction waste or an aforementioned wherein combination.And the additive amount of the aggregate is no more than the solid material composition
5 times of weight.
In some embodiments, 3 to 5 times of the weight that the additive amount of the aggregate is formed between the solid material.
Stemming operation, such as road stemming operation are carried out using the controlling low-intensity backfill cementing material containing red mud
When, it is only necessary to the controlling low-intensity backfill cementing material containing red mud modulated is layed in the road surface that need to be backfilled, to its nature
After hardening (presetting period: in 4 hours: final setting time: in 24 hours).
The present invention is using red mud as the primary raw material source of controlling low-intensity backfill cementing material, blast-furnace cinder of arranging in pairs or groups
And flyash is auxiliary material, and cooperates group composition and the ratio control of alkali activating solution, allows alkali activating solution in addition to alkali metal hydrogen-oxygen
Except compound and the alkalinity of alkali silicate control alkali activating solution, further by alkali metal aluminate regulation alkali activating solution
Aluminium content, and the hydroxy (- OH) of inorganic powder surface can be made to be easier to fully reacting, and the agglutination material formed after solidifying can be made
Material structure is more complete and then enhances its intensity.
Controlling low-intensity backfill cementing material of the present invention containing red mud conserves 7 days after solidification, compression strength
0.9MPa can be not less than.Preferably, when the weight ratio of blast-furnace cinder and fine coal is 1:1, and when being not added with aggregate, control of the present invention
For property low-intensity backfill cementing material processed after maintenance 7 days, compression strength can be greater than 8MPa.In addition, aggregate ought be added further
When, after maintenance 7 days, compression strength can still maintain to be not less than 3MPa controlling low-intensity backfill cementing material of the present invention.
Hereby the preparation method of the embodiment of the controlling low-intensity backfill cementing material by aforementioned containing red mud illustrates such as
Under:
Step 21 is carried out first, prepares the control containing red mud as described embodiments comprising red mud, inorganic particle and aggregate
Property low-intensity backfill cementing material.
Then, step 22 is carried out, the red mud is subjected to precomminution into powder (grain) shape.
Step 23 is carried out again, it is remaining being added after the described first pre-dispersed object and inorganic particle, aggregate are puddled dispersion
Alkali activating solution is puddled, and pre-composition slurry can be obtained.
In in use, the pre-composition slurry is layed in the road surface that need to be backfilled, after its air-set.
It is noted that when the controlling low-intensity backfill cementing material containing red mud does not include aggregate, then it is described
Step 23 only needs to be puddled the described first pre-dispersed object and inorganic particle and remaining alkali activating solution.
In addition, it is noted that due to red mud moisture content about 20 to 25% and contain larger amount of clay mineral, be easy
False agglomeration is caused, if directly use is not easy to disperse, and is easy aggregation and has the problem of dispersion unevenness, red mud is made powder by vertical calculate in advance
Preliminary dispersion is reached in broken processing, however, smashed red mud is also easy to restore false once again because of high-moisture reason itself
Property agglomeration.And if the false knot of red mud with drying mode processing red mud, although red mud water content can be reduced, after avoiding tentatively dispersion
The problem of block, but waste of energy.
Therefore, preparation method of the invention, wherein the pre-dispersed object of the first of the step 22 further will be also possible to
By precomminution treated red mud powder, the alkali activating solution for adding part in advance is puddled be modulated into red mud slurry after with carrying out in advance
It is subsequent to puddle operation.Subsequent dispersibility is influenced so as to the false agglomeration once again of the red mud powder after prevention dispersion.In addition, utilizing
Red mud is first modulated into red mud slurry, can also be promoted subsequent with inorganic particle and/or aggregate puddles uniformity, and is able to allow described
It is more stable in cured property that controlling low-intensity backfills cementing material, and has preferable compression strength.
That is, the described first pre-dispersed object of the step 22 is served as reasons when using red mud is modulated into red mud slurry
Red mud after smashing in advance is first red mud obtained by after 1.5:1 is puddled to 5:1 with weight ratio with the alkali activating solution of part
Slurry.And the step 23 is then to puddle the described first pre-dispersed object and the remaining alkali activating solution again.
Controlling low-intensity of the present invention backfill cementing material is hereby cooperated into following concrete examples and comparative example, with more specifically
It is bright.
Admittedly expecting constitutive material
1. red mud: the solid waste of aluminum oxide production process, main ingredient are iron oxide (Fe2O3), calcium oxide (CaO),
Silica (SiO2) and aluminium oxide (Al2O3), moisture content 24%.
2. blast-furnace cinder: one-stop operation steel mill generated water granulated slag in blast furnace ironmaking, which passes through, to be ground.It is main
Wanting composition is calcium oxide (CaO), silica (SiO2) and aluminium oxide (Al2O3)。
3. flyash: power plant burns coal power generation, and the unburned substance of superfine particle is collected through flue.Main ingredient is aluminium oxide
(Al2O3) and silica (SiO2)。
4. carbide slag: remaining waste residue after calcium carbide hydrolysis acquisition acetylene gas.Main ingredient is calcium hydroxide (Ca
(OH)2)。
Aggregate: sandstone (6 points of stones, 3 points of stones), river sand.
Alkali activating solution: sodium hydroxide/sodium metasilicate/sodium aluminate.
Concrete example 1
Weigh red mud, and weigh blast-furnace cinder, flyash, carbide slag be inorganic particle raw material, and by sodium hydroxide,
Sodium metasilicate and sodium aluminate are added to the water be uniformly mixed after obtain an alkali activating solution, and control the SiO of alkali activating solution2/Na2O's
Molar ratio is 1.0, SiO2/Al2O3Molar ratio be 50, and the liquid/solid of alkali activating solution and inorganic particle ratio is 0.2, and institute
The sodium hydroxide molar concentration for stating alkali activating solution is 4M.
The alkali activating solution of part and the red mud after smashing in advance are taken, the weight ratio of red mud and alkali activating solution is controlled
For 4:1, the aforementioned alkali activating solution with predetermined weight ratio is puddled with the red mud after smashing in advance, it is pre-dispersed to obtain first
Object (red mud slurry).
Then, the first pre-dispersed object is puddled with blast-furnace cinder, carbide slag and flyash, then, by first pre- point
It dissipates object to puddle with remaining alkali activating solution, obtains pre-composition slurry.
Then, using the pre-composition slurry moldings formed therefrom, the pre-composition slurry is poured into the circle of Φ 10cm × 20cm
In column type mold, cylindrical type examination body is made, can be prepared by sample 1.
Wherein, the weight ratio (liquid/solid ratio) of the concrete example 1, alkali activating solution and the solid material composition is 0.22, and with red
It is calculating benchmark that mud moisture content, which is 24%, and the alkali activating solution and the mixed total moisture content of the solid material composition are 30.8%.
Concrete example 2
Red mud is weighed, and weighs blast-furnace cinder, flyash as inorganic particle raw material, sandstone, river sand are aggregate, and will
Sodium hydroxide, sodium metasilicate and sodium aluminate are added to the water be uniformly mixed after obtain an alkali activating solution, and control alkali activating solution
SiO2/Na2The molar ratio of O is 1.5, SiO2/Al2O3Molar ratio be 50, and the liquid/solid of alkali activating solution and inorganic particle ratio
It is 0.1, and the sodium hydroxide molar concentration of the alkali activating solution is 4M.
Red mud is carried out after smashing in advance, the first pre-dispersed object (red mud powder) is obtained.
Then, it by the first pre-dispersed object and blast-furnace cinder, flyash, is puddled, is obtained with the aggregate (sandstone, river sand)
To pre-composition slurry.
Finally, the pre-composition slurry to be poured into the circle of Φ 10cm × 20cm using the pre-composition slurry moldings formed therefrom
In column type mold, cylindrical type examination body is made, can be prepared by sample 2.
Wherein, the weight ratio (liquid/solid ratio) of the concrete example 2, alkali activating solution and the solid material composition is 0.45, and with red
It is calculating benchmark that mud moisture content, which is 24%, and the alkali activating solution forms mixed total moisture content with the solid material and is
62.9wt%.
Concrete example 3
Weigh red mud, and weigh blast-furnace cinder, flyash is inorganic particle raw material, and by sodium hydroxide, sodium metasilicate
It is added to the water after being uniformly mixed with sodium aluminate and obtains an alkali activating solution, and controls the SiO of alkali activating solution2/Na2The molar ratio of O
Value is 0.8, SiO2/Al2O3Molar ratio be 100, and the liquid/solid of alkali activating solution and inorganic particle ratio is 0.25, and the alkali
The sodium hydroxide molar concentration of activating solution is 6M.
Red mud is carried out after smashing in advance, the first pre-dispersed object (red mud powder) is obtained.
Then, the first pre-dispersed object and blast-furnace cinder, flyash and alkali activating solution are puddled, obtains pre-composition slurry
Body.
Then, using the pre-composition slurry moldings formed therefrom, the pre-composition slurry is poured into the circle of Φ 10cm × 20cm
In column type mold, cylindrical type examination body is made, can be prepared by sample 3.
Wherein, the weight ratio (liquid/solid ratio) of the concrete example 3, alkali activating solution and the solid material composition is 0.45, and with red
It is calculating benchmark that mud moisture content, which is 24%, and the alkali activating solution forms mixed total moisture content with the solid material and is
33.4wt%.
Concrete example 4
The composition of the concrete example 4 is roughly the same with the concrete example 3, and the weight for being different in red mud and flyash is omited
It is variant.
Sample 4 is made with production method identical with the concrete example 3 in the composition of the concrete example 4 again.
Wherein, the weight ratio (liquid/solid ratio) of the concrete example 4, alkali activating solution and the solid material composition is 0.25, and with red
It is calculating benchmark that mud moisture content, which is 24%, and the alkali activating solution forms mixed total moisture content with the solid material and is
35.36wt%.
Comparative example 1
The production method of 1 sample of comparative example is substantially identical as the concrete example 2, is different in the comparative example 1
Composition be that alkali activating solution is replaced with water, and add water-reducing agent, and composition ratio is different from the concrete example 2.
Then, comparative sample 1 then by the composition of the comparative example 1 with production method identical with the concrete example 2 is made.
Wherein, the weight ratio (liquid/solid ratio) of the comparative example 1, water and the solid material composition is 0.55, and aqueous with red mud
It is calculating benchmark that rate, which is 24%, and the water and the solid material form mixed total moisture content as 46.2wt%.
Comparative example 2
The production method of 2 sample of comparative example is substantially identical as the concrete example 3, is different in the comparative example 2
Composition be free of carbide slag and flyash, and composition ratio is different from the concrete example 3.
Then, comparative sample 2 then by the composition of the comparative example 2 with production method identical with the concrete example 3 is made.
Wherein, the weight ratio (liquid/solid ratio) of the comparative example 1, the alkali activating solution and the solid material composition is 0.2, and
It is 24% for calculating benchmark with red mud moisture content, the alkali activating solution forms mixed total moisture content with the solid material and is
33.7wt%.
Then sample made from the concrete example and comparative example is subjected to resistance to compression according to national standard (GB/T2542-2012)
Strength test.
Hereby the raw material of aforementioned concrete example and comparative example composition and intensity test result are arranged respectively such as 1,2 institute of table
Show.
Table 1
Table 2
*: Gu water/ratio
By the compression strength result of aforementioned 2 concrete example 1 to 4 of table it is found that controlling low-intensity of the present invention backfills cementing material
After maintenance 7 days, compression strength is greater than 0.9MPa, wherein the weight ratio of blast-furnace cinder and flyash is between 3:1 to 1:1
When, after maintenance 7 days and 28 days, compression strength can be not less than 3MPa and 5MPa respectively.And from 2 concrete example of table, 3 result:
When the weight ratio of blast-furnace cinder and fine coal is 1:1 and is free of aggregate, controlling low-intensity of the present invention backfill cementing material in
After maintenance 7 days, compression strength is i.e. up to 8.9MPa.In addition, known to 2 result of concrete example when addition aggregate, the resistance to compression of maintenance 1 day
Intensity reaches 0.7MPa, and 7 days compression strength is also up to 3.0MPa.It is noted that in the way of pre-dispersed size mixing,
Smashed red mud is first tuned into red mud slurry, recycles red mud slurry to be puddled with other powders and aggregate, by 1 result of concrete example
It is found that its 7 days compression strength can reach 14.1MPa, display using red mud is deployed into red mud slurry really in advance and can be promoted with
Inorganic particle and aggregate puddle uniformity, and be able to allow the controlling low-intensity backfill cementing material in cured property more
For stabilization, and there is more preferably compression strength.
In conclusion the present invention is utilized with red mud waste as main raw material sources, collocation blast-furnace cinder and flyash are
Auxiliary material, and cooperate the solid-liquid when composition of alkali activating solution and the control of alkali modulus, and obtain the glue with appropriate compression strength
Material is tied, not only can be widely applied to building and stemming operation, also helps the environmental issue for solving red mud waste from stacking, and is had
Wider application.
Claims (10)
1. a kind of controlling low-intensity containing red mud backfills cementing material, it is characterised in that: include: Gu material composition and alkali activation
Liquid, the solid material composition include red mud and inorganic particle, and the inorganic particle includes blast-furnace cinder and flyash, the alkali activation
Liquid includes alkali metal hydroxide, alkali silicate, alkali metal aluminate and water, wherein the alkali activating solution with it is described solid
Expect that the weight ratio of composition between 0.2 to 0.6, is counted with the weight percent that the solid material forms for 100wt%, the red mud
Content is between 60wt% to 80wt%, and the silica of the alkali activating solution and the molar ratio of alkali metal oxide are between 0.8
To 1.5, the molar ratio of silica and aluminium oxide is between 50 to 100, and the alkali activating solution is mixed with the solid material composition
Total moisture content afterwards is between 40wt% to 80wt%.
2. the controlling low-intensity containing red mud backfills cementing material according to claim 1, it is characterised in that: wherein, described
Alkali metal hydroxide is sodium hydroxide, and the sodium hydroxide molar concentration of the alkali activating solution is between 3M to 8M.
3. the controlling low-intensity containing red mud backfills cementing material according to claim 1, it is characterised in that: the inorganic powder
Body further includes carbide slag, clay or an aforementioned wherein combination.
4. the controlling low-intensity containing red mud backfills cementing material according to claim 1, it is characterised in that: the Blast Furnace Ore
The weight ratio of slag and flyash is between 3:1 to 1:1.
5. the controlling low-intensity containing red mud backfills cementing material according to claim 1, it is characterised in that: also include bone
Material, the aggregate are selected from river sand, stone, artificial aggregate, steel slag, construction waste or an aforementioned wherein combination, and the aggregate
Additive amount no more than 5 times of the solid material composition.
6. according to claim 1 or the 5 controlling low-intensity containing red mud backfill cementing material, it is characterised in that: the control
7 day compression strength of the property low-intensity backfill cementing material processed after solidification are not less than 0.9MPa.
7. according to claim 1 or the 5 controlling low-intensity containing red mud backfill cementing material, it is characterised in that: the height
The weight ratio of furnace slag and flyash is between 3:1 to 1:1, and controlling low-intensity backfill cementing material is after solidification
Compression strength is not less than 5MPa within 28 days.
8. a kind of preparation method of the controlling low-intensity backfill cementing material containing red mud, it is characterised in that:
Prepare the controlling low-intensity containing red mud as described in claim 1 and backfills cementing material；
The red mud is subjected to precomminution processing, obtains the first pre-dispersed object；
Then, the first pre-dispersed object is puddled with the inorganic particle and alkali activating solution, pre-composition slurry can be obtained.
9. the preparation method of the controlling low-intensity backfill cementing material containing red mud according to claim 8, it is characterised in that:
The first pre-dispersed object is after red mud is carried out precomminution processing, further by precomminution treated red mud and partial
Red mud slurry obtained by alkali activating solution is puddled afterwards, and the weight ratio of the red mud of the first pre-dispersed object and alkali activating solution is between 1.5:
1 to 5:1, the pre-composition slurry is after puddling the first pre-dispersed object and inorganic particle and the remaining alkali activating solution
?.
10. the preparation method of the controlling low-intensity backfill cementing material containing red mud, feature exist according to claim 8
In: the controlling low-intensity backfill cementing material containing red mud also includes aggregate, and the pre-composition slurry is by first pre- point
It dissipates object and inorganic particle, aggregate and the remaining alkali activating solution puddles rear obtain.
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| CN111302682A (en) * | 2019-12-17 | 2020-06-19 | 李韦皞 | Alkali activation slurry containing alkali activation liquid and inorganic powder |
| CN113003992A (en) * | 2021-04-19 | 2021-06-22 | 安徽理工大学 | Red mud slag and preparation method thereof |
| CN117326842A (en) * | 2023-09-18 | 2024-01-02 | 中国海洋大学 | Solidified contaminated soil and method for filling roadbed by using solidified contaminated soil |
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| CN117326842A (en) * | 2023-09-18 | 2024-01-02 | 中国海洋大学 | Solidified contaminated soil and method for filling roadbed by using solidified contaminated soil |
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