CN110066128A - A kind of magnesia swelling agent and preparation method thereof using the preparation of high calcium magnesite tailing - Google Patents
A kind of magnesia swelling agent and preparation method thereof using the preparation of high calcium magnesite tailing Download PDFInfo
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- CN110066128A CN110066128A CN201910360804.5A CN201910360804A CN110066128A CN 110066128 A CN110066128 A CN 110066128A CN 201910360804 A CN201910360804 A CN 201910360804A CN 110066128 A CN110066128 A CN 110066128A
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- high calcium
- calcium magnesite
- swelling agent
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- magnesia
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a kind of magnesia swelling agents and method using the preparation of high calcium magnesite tailing.Magnesia swelling agent of the present invention is to adjust material with aluminium hydroxide, the raw meal powder as made from high calcium magnesite tailing and aluminium hydroxide is prepared in 950 DEG C of -1050 DEG C of temperature lower calcinations using high calcium magnesite tailing as primary raw material.The present invention decomposes the Al generated using aluminium hydroxide2O3It absorbs high calcium magnesite tailing and decomposes the f-CaO generation gelling substance monocalcium aluminate and C 12 A 7 generated, it significantly reduces high calcium magnesite tailing and produces the f-CaO content generated during magnesia swelling agent, the social concern that very good solution high calcium magnesite tailing pollutes ecological environment, value added applications for high calcium magnesite tailing extend direction, reduce the production cost of magnesia swelling agent, the market competitiveness is provided for the popularization and application in magnesia swelling agent hydraulic and hydroelectric engineering, there are significant economic results in society.
Description
Technical field
The present invention relates to a kind of preparation methods of swelling agent, and in particular to it is a kind of using high calcium magnesite tailing prepare it is magnesia
The method of swelling agent.
Background technique
Magnesite is a kind of main nonmetallic mineral containing magnesium carbonate, it is the important sources of magnesium metal and magnesian, is belonged to
In national grand strategy resource.In the magnesite resource that China possesses, low-grade magnesite accounts for the nearly half of gross reserves.By tens
The exploitation in year, quite a few high-quality magnesite mine are seriously damaged, and high-grade magnesite resource is reduced increasingly, low-grade water chestnut
Magnesium mine is largely discarded.CaO in magnesite ore can form CaSiO with containing silicon impurities in calcination process3, in cooling procedure
Easily turn brilliant loose and collapse refractory material, the high calcium magnesite in magnesite ore containing CaO higher (CaO content > 4%) is difficult
To meet the requirement of production refractory material and other high-performance magnesium chemical materials.High calcium magnesite is mostly in the form of low-grade tailings
It covers or fills for road surface, cause the serious waste of magnesite resource.How it is scientific and reasonable utilize high calcium magnesite tailing,
The resource utilization for improving magnesite is current urgent problem.
The method for living together reason to low-grade magnesite upgrading drop at present is mainly beneficiating method, passes through flotation, heat choosing and chemistry
The methods of ore dressing separates the impurity such as calcium, silicon, aluminium, the iron in magnesite, improves the grade of magnesite.It is miscellaneous in high calcium magnesite tailing
Matter mainly exists with calcium carbonate form, and very close with magnesium carbonate property, separating calcium and magnesium is extremely difficult, and seriously affecting its product makes
Use effect.The method of high calcium magnesite tailing deliming mainly has chemical flotation method and carbonizatin method etc. at present.Chemical flotation method need to make
With a large amount of beneficiation reagent, and deliming is not thorough, and many impurity waste materials is occurred in ore dressing process and be difficult to handle, and is easy
Secondary environmental pollution is generated, the waste of resource and the energy is caused.Carbonizatin method passes through the streams such as calcining, digestion, carbonization, precipitating, drying
Journey may compare thoroughly removal calcium impurities, and refining effect is good, but there is a problem of process complexity, long flow path, at high cost.
The Chinese patent of publication number CN108046621A discloses a kind of preparation method of calcined dolomite powder, and use is siliceous
Component is that 0.5:1~4:1 compounds mixed calcining with dolomite dust in mass ratio, utilizes the SiO in silicon containing component2With dolomite dust
The CaO of calcining and decomposing, which is combined, generates C2S, the mineral such as akermanite and diopside, to reach reduction, eliminate in dolime
The purpose of free CaO content.When CaO of this method in selective absorbing dolime, need to additionally introduce dolomite from
The CaO generated in dolime could be absorbed into C by the silicon containing component that 0.5~4 times of body quality2S, akermanite and
The mineral such as diopside, at the same can substitute into generate largely have neither part nor lot in reaction containing silicon impurities, significantly reduce dolime product
Middle MgO effective content.Slack-off with f-CaO reaction speed when silicon containing component amount is few, the f-CaO content of energy reactive absorption is opposite
It is less, the f-CaO in dolime cannot be eliminated.
MgO expansion agent with controllable expansion characteristic and anti-cracking function can effective compensation mass concrete temperature drop
It shrinks, important function has been played to reduce the temperature cracking risk of mass concrete, in national more than 40 a hydraulic engineerings
In succeed application, form " the magnesia Construction of Dams by Concrete With Gentle Volume Expansion " for possessing independent intellectual property right, and promulgated the
" concrete for hydraulic structure mixes magnesia technology rule to one hydropower industry standard DL/T5296-2013 for MgO expansion agent
Model ", direction is specified for the specification application of MgO expansion agent.This standard not only defines containing for MgO in MgO expansion agent
Amount, and define f-CaO content in MgO expansion agent, make high calcium magnesite for the production of MgO expansion agent by bright
Development is rung.While how guaranteeing effective content of MgO, high calcium magnesite tailing is significantly reduced in production MgO expansion agent process
The f-CaO content of middle generation is the key that limitation high calcium magnesite tailing production application in MgO expansion agent.
Summary of the invention
Miscellaneous complex disposal process drops in upgrading for high calcium magnesite tailing, and it is at high cost, be also easy to produce secondary environmental pollution
Problem, the present invention provide a kind of simple process, product economy it is costly it is a kind of prepared using high calcium magnesite tailing it is magnesia swollen
Swollen dose of method.
To achieve the above object, the invention adopts the following technical scheme:
A kind of magnesia swelling agent prepared using high calcium magnesite tailing, using high calcium magnesite tailing as primary raw material, with
Aluminium hydroxide is to adjust material, by high calcium magnesite tailing and aluminium hydroxide high calcium magnesite tailing 90-95 parts, hydrogen in parts by weight
Raw meal powder made from 5-10 parts of raw materials of aluminium oxide is made in 950 DEG C of -1050 DEG C of temperature lower calcinations；
The high calcium magnesite tailing is CaO content > 4wt% magnesite tailings；
The aluminium hydroxide is technical grade aluminium hydroxide, Al2O3Content > 60wt%.
A kind of method preparing magnesia swelling agent using high calcium magnesite tailing of the present invention has following technique step
It is rapid:
(1) by two kinds of raw materials of high calcium magnesite tailing and aluminium hydroxide according to intergrinding after above-mentioned parts by weight ingredient extremely
Raw meal powder is made in 250~300 mesh；
(2) raw meal powder made from step (1) is calcined to 60~90min under 950 DEG C~1050 DEG C high temperature, calcining terminates
It afterwards, is 300~400m by calcined material grinding to specific surface area2/ kg to get to it is of the present invention it is a kind of utilize high calcium magnesite
The magnesia swelling agent of tailing preparation.
The main component of magnesia swelling agent produced by the present invention is magnesia, some ingredient is that aluminium hydroxide decomposes
The Al of generation2O3It absorbs high calcium magnesite tailing and decomposes substance monocalcium aluminate and seven aluminium that the f-CaO generation generated has gelling
Sour ten dicalcium.
The present invention compared with existing product, using high calcium magnesite tailing as primary raw material, is to adjust material with aluminium hydroxide, leads to
It crosses aluminium hydroxide and decomposes the Al generated2O3It absorbs high calcium magnesite tailing and decomposes the object that the f-CaO generation generated has gelling
Matter significantly reduces high calcium magnesite tailing and produces the f-CaO content generated during magnesia swelling agent, makes produced magnesia expansion
Agent meets the requirement of f-CaO content limit value in hydropower industry standard DL/T5296-2013.Magnesia swelling agent of the invention is main
Mineralogical composition is magnesia, monocalcium aluminate and C 12 A 7, and magnesia remains magnesia swelling agent itself expansion characteristics
Advantage, monocalcium aluminate and C 12 A 7 have the gelling characteristic for increasing cement concrete mechanical property, and being formed has enhancing
The magnesia swelling agent of characteristic.
The present invention replaces high-grade magnesite to produce magnesia swelling agent with high calcium magnesite tailing, opens one and prepares magnesium
The new way of matter swelling agent, the social concern that very good solution high calcium magnesite tailing pollutes ecological environment, for height
The value added applications of calcium magnesite tailings extend direction, reduce the production cost of magnesia swelling agent, are magnesia swelling agent
Popularization and application in hydraulic and hydroelectric engineering provide the market competitiveness, have significant economic results in society.
Specific embodiment
Below in conjunction with specific embodiment a kind of magnesia swelling agent is prepared using high calcium magnesite tailing to of the present invention
The technical characteristic of method is further elaborated.High calcium magnesite tailing used in the following embodiments of the present invention comes from Liaoning Province
Haicheng City decorated archway town magnesite mining area, aluminium hydroxide come from Hefei Zhong Ke flame-retarding new material Co., Ltd.
The present invention provides a kind of magnesia swelling agents of high calcium magnesite tailing preparation, and composition of raw materials is by following parts by weight
Several components is constituted: 90-95 parts of high calcium magnesite tailings, 5-10 parts of aluminium hydroxides.
The present invention also provides a kind of methods for preparing above-mentioned magnesia swelling agent, first by high calcium magnesite tailing and hydroxide
Raw meal powder is made according to intergrinding to 250~300 mesh after above-mentioned parts by weight ingredient in two kinds of raw materials of aluminium, then raw meal powder is existed
Under 950 DEG C~1050 DEG C high temperature calcine 60~90min, after calcining, by calcined material grinding to specific surface area be 300~
400m2/ kg to get to the present invention it is a kind of using high calcium magnesite tailing prepare magnesia swelling agent.
During preparing magnesia swelling agent using high calcium magnesite tailing, the effect of high calcium magnesite tailing is to provide
MgCO3And CaCO3, decomposed in firing reaction and generate light calcined magnesia and active free calcium oxide, active calcium oxide and hydroxide
Aluminium decomposes the active Al generated2O3Reaction forms monocalcium aluminate (CA) mineral and C 12 A 7 (C12A7) mineral, aluminium hydroxide
Effect be to provide Al2O3, decomposed in firing reaction and generate activity Al2O3High calcium magnesite tailing is absorbed afterwards decomposes generation
Active free calcium oxide generates monocalcium aluminate (CA) mineral and C 12 A 7 (C12A7) mineral.Magnesia swelling agent is being calcined
The main chemical reactions process occurred in the process is as follows:
Magnesia swelling agent of the invention contains the expansion characteristics and monocalcium aluminate and C 12 A 7 of light calcined magnesia
Gelling characteristic, using high calcium magnesite tailing as primary raw material, with aluminium hydroxide be adjust material, pass through aluminium hydroxide decompose generate
Active Al2O3The active free calcium oxide generated, which is decomposed, with high calcium magnesite tailing reacts generation monocalcium aluminate and seven aluminic acids ten
The gellings substance such as dicalcium, turns bane into boon, and significantly reduces during the calcining of high calcium magnesite tailing produces magnesia swelling agent and produces
Raw free calcium oxide improves the mechanical property of magnesia swelling agent, and remains the excellent of light calcined magnesia itself expansion characteristics
Point forms the magnesia swelling agent with enhancing characteristic, is the high added value in hydraulic and hydroelectric engineering of high calcium magnesite tailing
Application extension direction.
Embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and specific
Operating process, embodiment will be helpful to understand the present invention, but protection scope of the present invention is not limited to following embodiments.
Embodiment 1
First by two kinds of raw materials of 92 parts of high calcium magnesite tailings and 8 parts of aluminium hydroxide according to intergrinding after ingredient in proportion extremely
Raw meal powder is made in 250 mesh, then the raw meal powder after grinding is calcined under 1000 DEG C of high temperature, and keep the temperature 80min at such a temperature, protects
Taking out after temperature cools down calcined material in air, is finally 350m by cooling calcined material grinding to specific surface area2/
Kg to get to the present invention it is a kind of using high calcium magnesite tailing prepare magnesia swelling agent HME-1.
Embodiment 2
First by two kinds of raw materials of 95 parts of high calcium magnesite tailings and 5 parts of aluminium hydroxide according to intergrinding after ingredient in proportion extremely
Raw meal powder is made in 300 mesh, then the raw meal powder after grinding is calcined under 1050 DEG C of high temperature, and keep the temperature 60min at such a temperature, protects
Taking out after temperature cools down calcined material in air, is finally 300m by cooling calcined material grinding to specific surface area2/
Kg to get to the present invention it is a kind of using high calcium magnesite tailing prepare magnesia swelling agent HME-2.
Embodiment 3
First by two kinds of raw materials of 90 parts of high calcium magnesite tailings and 10 parts of aluminium hydroxide according to intergrinding after ingredient in proportion
Raw meal powder is made to 280 mesh, then the raw meal powder after grinding is calcined under 950 DEG C of high temperature, and keep the temperature 90min at such a temperature,
Taking out after heat preservation cools down calcined material in air, is finally by cooling calcined material grinding to specific surface area
400m2/ kg to get to the present invention it is a kind of using high calcium magnesite tailing prepare magnesia swelling agent HME-3.
Comparative example 1
The common high-grade magnesite of MgO expansion agent (CaO content≤0.5wt%) is produced in the market to produce at present
For raw material, 100 parts of high-grade magnesite powders are milled to 300 mesh, raw meal powder is made, then by the raw meal powder after grinding in 1050 DEG C of height
The lower calcining of temperature, and 60min is kept the temperature at such a temperature, taking out after heat preservation cools down calcined material in air, finally will be cold
But calcined material grinding to specific surface area is 350m2/ kg is not incorporated into hydroxide to get to exclusive use high-grade magnesite
The magnesia swelling agent comparative example HME-A of calcining and decomposing production when aluminium adjusts material.
Comparative example 2
It is identical as high calcium magnesite tailing chemical component used in 1~embodiment of embodiment 3, by 100 parts of high calcium magnesite tails
Miberal powder is milled to 300 mesh and raw meal powder is made, then the raw meal powder after grinding is calcined under 1050 DEG C of high temperature, and keeps the temperature at such a temperature
60min, taking out after heat preservation cools down calcined material in air, finally by cooling calcined material grinding to specific surface area
For 400m2/ kg is not incorporated into calcining and decomposing production when aluminium hydroxide adjusts material to get to exclusive use high calcium magnesite tailing
Magnesia swelling agent comparative example HME-B.
Comparative example 3
Expect using silicon ash as adjusting, first by 95 parts of high calcium magnesite tailings and 5 parts of silicon ashes, two kinds of raw materials according to matching in proportion
Raw meal powder is made in intergrinding to 300 mesh after material, then the raw meal powder after grinding is calcined under 1050 DEG C of high temperature, and in the temperature
Lower heat preservation 60min, after heat preservation take out cool down calcined material in air, finally by cooling calcined material grinding to than
Surface area is 300m2/ kg is to adjust the magnesia swelling agent comparative example of material calcining high calcium magnesite tailing preparation to get arriving with silicon ash
HME-C。
Referring to hydropower industry standard DL/T5296-2013 " concrete for hydraulic structure mixes magnesia technical specification " testing example
F-CaO content in sample and comparative example, table 1 provide f-CaO content in Examples 1 to 3 and comparative example 1~3 six kind sample
Testing result.This hair that aluminium hydroxide adjusts calcining high calcium magnesite tailing preparation after material is mixed it can be seen from data in table 1
F- in f-CaO content very little in bright Examples 1 to 3 sample, with the comparative example HME-A sample with the calcining preparation of high-grade magnesite
CaO content test result is similar, meets the requirement that hydropower industry standard limits f-CaO content；It is not incorporated into aluminium hydroxide adjusting
F-CaO content is up to 8.55% in the comparative example HME-B of material dinectly bruning high calcium magnesite tailing production, is adjusted using silicon ash
Material is up to 6.21% with f-CaO content in the comparative example MHE-C of high calcium magnesite tailing mixed calcining production preparation, is unable to satisfy
The requirement that hydropower industry standard limits f-CaO content, cannot be in hydropower industry application.It is indicated above that use aluminium hydroxide for
Material is adjusted, the f-CaO in magnesia swelling agent that under conditions of very little compound proportion just high calcium magnesite tailing can produce
Content significantly reduces, and reaches the phase same level of f-CaO content in the magnesia swelling agent of high-grade magnesite production, but use silicon ash
When to adjust material, it is difficult under conditions of very little compound proportion in the magnesia swelling agent that the production of high calcium magnesite tailing is effectively reduced
F-CaO content, be not used to hydropower industry.
Each embodiment of table 1 and comparative example f-CaO content measuring result
The method referring to as defined in Chinese architecture materials association standard CBMF19-2017 " concrete MgO expansion agent " is surveyed
Embodiment and comparative example physical property is tried, table 2 provides the expansion character and power of Examples 1 to 3 and comparative example 1~3 six kind sample
Learn performance test results.It can be seen from data in table 2 mechanical property and expansion character of 1~3 sample of the embodiment of the present invention with
It is essentially identical using the comparative example HME-A mechanical property and expansion character of high-grade magnesite calcining preparation, it is able to satisfy standard
It is required that.It is not incorporated into aluminium hydroxide and adjusts the comparative example HME-B of material dinectly bruning high calcium magnesite tailing production and with silicon ash for tune
Although material-saving calcines the mechanical property of the magnesia swelling agent comparative example HME-C of high calcium magnesite tailing preparation and expansion character can be full
Sufficient standard requirements, but their expansion character and mechanical property are significantly lower than embodiment sample.It is indicated above that using hydrogen-oxygen
Changing aluminium is that adjusting expects that the magnesia swelling agent mechanical property produced with high calcium magnesite tailing mixed calcining and expansion character are excellent, can
Reach the magnesia swelling agent phase same level of high-grade magnesite production, hence it is evident that adjust material dinectly bruning better than aluminium hydroxide is not incorporated into
The comparative example HME-B and be to adjust material to calcine the magnesia swollen of high calcium magnesite tailing preparation with silicon ash that high calcium magnesite tailing produces
Swollen dose of comparative example HME-C.
The expansion character and mechanical property of each embodiment of table 2 and comparative example
Claims (3)
1. a kind of magnesia swelling agent prepared using high calcium magnesite tailing, which is characterized in that the magnesia swelling agent is with high calcium
Magnesite tailings are primary raw material, are to adjust material with aluminium hydroxide, in parts by weight by high calcium magnesite tailing and aluminium hydroxide
It is forged at a temperature of 950 DEG C -1050 DEG C for raw meal powder made from 5-10 parts of 90-95 parts of high calcium magnesite tailing, aluminium hydroxide raw materials
It fires；
The high calcium magnesite tailing is CaO content > 4wt% magnesite tailings；
The aluminium hydroxide is technical grade aluminium hydroxide, Al2O3Content > 60wt%.
2. a kind of method for preparing magnesia swelling agent using high calcium magnesite tailing described in claim 1, which is characterized in that tool
Body includes the following steps:
(1) by two kinds of raw materials of high calcium magnesite tailing and aluminium hydroxide according to intergrinding after above-mentioned parts by weight ingredient to 250
Raw meal powder is made in~300 mesh；
(2) raw meal powder made from step (1) is calcined to 60~90min under 950 DEG C~1050 DEG C high temperature, it, will after calcining
Calcined material grinding to specific surface area is 300~400m2/ kg to get arrive the magnesia swelling agent.
3. a kind of method for preparing magnesia swelling agent using high calcium magnesite tailing according to claim 2, feature exist
In the ingredient of the magnesia swelling agent made from step (2) includes magnesia, by the Al of aluminium hydroxide decomposition generation2O3It absorbs high
Calcium magnesite tailings decompose the f-CaO monocalcium aluminate generated and C 12 A 7 generated.
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| CN110423033A (en) * | 2019-08-12 | 2019-11-08 | 江苏博拓新型建筑材料有限公司 | A kind of cement expansive material and preparation method thereof |
| CN114835422A (en) * | 2021-07-21 | 2022-08-02 | 东南大学 | Calcium-magnesium composite expansion clinker, preparation method thereof and application thereof in low-shrinkage high-crack-resistance marine large-volume concrete |
| CN117886532A (en) * | 2024-01-16 | 2024-04-16 | 辽宁科技大学 | Magnesite waste rock and magnesite tailing semi-rigid pavement base material and preparation method and application thereof |
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| CN114835422A (en) * | 2021-07-21 | 2022-08-02 | 东南大学 | Calcium-magnesium composite expansion clinker, preparation method thereof and application thereof in low-shrinkage high-crack-resistance marine large-volume concrete |
| CN117886532A (en) * | 2024-01-16 | 2024-04-16 | 辽宁科技大学 | Magnesite waste rock and magnesite tailing semi-rigid pavement base material and preparation method and application thereof |
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