CN107311491B - A kind of method of concrete regenerating micro mist production magnesium cement activated magnesia - Google Patents
A kind of method of concrete regenerating micro mist production magnesium cement activated magnesia Download PDFInfo
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- CN107311491B CN107311491B CN201710542238.0A CN201710542238A CN107311491B CN 107311491 B CN107311491 B CN 107311491B CN 201710542238 A CN201710542238 A CN 201710542238A CN 107311491 B CN107311491 B CN 107311491B
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- Prior art keywords
- magnesium
- activated magnesia
- micro mist
- concrete regenerating
- concrete
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Classifications
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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
- C04B9/00—Magnesium cements or similar 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
- C04B9/00—Magnesium cements or similar cements
- C04B9/02—Magnesium cements containing chlorides, e.g. Sorel cement
-
- 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
- C04B9/00—Magnesium cements or similar cements
- C04B9/04—Magnesium cements containing sulfates, nitrates, phosphates or fluorides
-
- 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
- C04B9/00—Magnesium cements or similar cements
- C04B9/20—Manufacture, e.g. preparing the batches
Abstract
The invention discloses a kind of methods of concrete regenerating micro mist production magnesium cement activated magnesia, the described method comprises the following steps: 1) prepared by lotion: by 10~50 parts of concrete regenerating micro mists, being mixed to get emulsion with 20~1000 parts of magnesium chloride solutions；2) prepared by solid phase containing magnesium: emulsion is heated to reacting 12h~for 24 hours at 50~100 DEG C, and the emulsion after reaction obtains solid phase containing magnesium after filtering；3) obtain magnesium cement activated magnesia: solid phase containing magnesium calcines 1h~6h at 400~1000 DEG C, obtains magnesium cement activated magnesia.The present invention can not only realize the method that the change of the high level of concrete regenerating micro mist and salt lake chlorination magnesium resource utilizes simultaneously, but also provide a kind of new activated magnesia source for production magnesium cement, can reduce the production cost of magnesium cement.
Description
Technical field
The present invention relates to the method for concrete regenerating micro mist resource utilization, specially a kind of concrete regenerating micro mist is raw
The method for producing magnesium cement activated magnesia.
Background technique
With the rapid development of Chinese national economy, large-scale modernization construction brings flourishing hair to construction industry
Exhibition, while also producing a large amount of waste material of buildings.In waste material of buildings, waste and old concrete accounts for larger specific gravity, therefore can be effectively real
The regeneration of existing waste and old concrete, has important environmental protection and economic significance.Concrete regenerating micro mist refers to discarded mixed
When solidifying soil is re-used, generated partial size is less than the fine particles of 0.16mm in shattering process.Currently, regeneration is micro-
The main utilization ways of powder include: to substitute partial gelation material as filler in the fresh concrete that (1) directly adds.(2) lead to
It crosses and calcium oxide is added, waterglass, slag equal excitation agent prepare new cementitious material.Such as Chinese Patent Application No.
201410322859.4 disclose a kind of pump concrete for mixing low-quality regenerative micro powder and low-quality recycled aggregate, directly will again
Raw micro mist is added to substitution partial gelation material in pump concrete.
Magnesium cement is a kind of using activated magnesia and magnesium salts as the magnesium gelatinous material of primary raw material.Magnesium cement is light because having
The advantages that matter is high-strength, decorative performance is excellent, good flame retardation effect is widely used in the various materials for walls of production.But production magnesium cement at present
Activated magnesia used is mainly caustic magnesite in powder.Caustic magnesite in powder is calcined from magnesite.And the magnesite in China is big
It focuses mostly in Liaoning, Shandong and other places.Therefore in the non-coastal area in China, especially the magnesium oxysulfide concrete of west area production at
This is higher, therefore how to obtain the oxidation source of low cost for the life in non-coastal or west area popularization magnesium cement product
Production is of great significance.Although Yanhu Districts such as China Qinghai, there is an a large amount of chlorination magnesium resource, how low cost, low pollution
It produces and is difficult to solve always suitable for the activated magnesia of magnesium cement.
Summary of the invention
The purpose of the present invention is to provide a kind of method of concrete regenerating micro mist resource utilization, especially a kind of coagulation
The method of native regenerative micro powder production magnesium cement activated magnesia.This method is at low cost, pollutes low.
In order to achieve the above objectives, the invention is realized by the following technical scheme:
A kind of method of concrete regenerating micro mist production magnesium cement activated magnesia, the described method comprises the following steps:
1) prepared by lotion:
By 10~50 parts of concrete regenerating micro mists, emulsion is mixed to get with 20~1000 parts of magnesium chloride solutions；
2) prepared by solid phase containing magnesium:
Emulsion is heated to reacting 12h~for 24 hours at 50~100 DEG C, and the emulsion after reaction obtains solid containing magnesium after filtering
Phase；
3) magnesium cement activated magnesia is obtained:
Solid phase containing magnesium calcines 1h~6h at 400~1000 DEG C, obtains magnesium cement activated magnesia.
Preferably, the concrete regenerating micro mist is that waste and old concrete is crushed, is sieved to obtain partial size less than 0.15mm's
Powder.
Preferably, the magnesium chloride solution is that salt lake mentions potassium chloride by-product of magnesium chloride and dissolves resulting mass fraction and is
10%~30% solution.
The present invention considers concrete regenerating micro mist, has strong basicity, and chemical composition is mainly calcium hydroxide, hydration silicon
The calcareous materials such as sour calcium, therefore can react to obtain the solid phase containing magnesium hydroxide or magnesium silicate with soluble magnesium salts, then
Magnesium activity of cement magnesia can be obtained in dinectly bruning.
The present invention can not only realize the side that the change of the high level of concrete regenerating micro mist and salt lake chlorination magnesium resource utilizes simultaneously
Method, and a kind of new activated magnesia source is provided for production magnesium cement, the production cost of magnesium cement can be reduced.
The present invention has the following advantages that compared with the prior art and excellent effect:
(1) present invention directly prepares solid phase containing magnesium using concrete regenerating micro mist and magnesium chloride, and calcining obtains active oxidation
Magnesium, simple process, production cost are low.
(2) present invention prepares activated magnesia due to using concrete regenerating powder material, not only realizes its high level
Change.And it avoids when magnesium chloride directly decomposes production magnesia and discharges the corrosive gas of hydrogen chloride, therefore there is environment protection significance.
(3) the resulting activated magnesia of the present invention is reacted because have passed through regenerative micro powder with soluble magnesium salts, wherein containing
A certain amount of silicic acid gel.And silicic acid gel is by can be improved the water repelling property of magnesium cement.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention.
Specific embodiment
The present invention is described in further detail for specific embodiment below.It is further below by way of comparative example embodiment
The present invention is illustrated, wherein embodiment is only used for the purpose illustrated, does not limit the scope of the invention.It is following that tool is not specified
The experimental method of concrete conditions in the establishment of a specific crime, usually according to traditional normal condition.
Embodiment 1:
Regenerative micro powder crushes, the powder for the 0.15mm being sieved for certain waste and old concrete.Its main chemical composition is such as
Shown in table 1.
Table 1: concrete regenerating differential chemical composition
| Ingredient | CaO | SiO2 | Al2O3 | MgO | Fe2O3 | Na2O | SO3 |
| Mass percent/% | 47.3 | 36.5 | 10.1 | 2.5 | 1.6 | 0.3 | 1.2 |
Magnesium cement is prepared with activated magnesia:
As shown in Figure 1, the magnesium chloride solution for being 30% with 20 parts of mass fractions mixes by 10 parts of concrete regenerating micro mists
To emulsion.Emulsion is heated to reacting for 24 hours at 50 DEG C.Emulsion after reaction obtains solid phase containing magnesium after filtering.It is solid containing magnesium
6h mutually is calcined at 400 DEG C, obtains magnesium cement activated magnesia.
Analyzing resulting active oxidation content of magnesium through hydration method is 30.8%.According to activated magnesia: magnesium chloride: water rubs
, than being 5:1:15, the 28 days intensity of magnesium cement of preparation is 78MPa for you.
Embodiment 2:
Regenerative micro powder is the same as example 1
Magnesium cement is prepared with activated magnesia:
As shown in Figure 1, the magnesium chloride solution for being 10% with 1000 parts of mass fractions mixes by 20 parts of concrete regenerating micro mists
Obtain emulsion.Emulsion is heated to reacting 12h at 100 DEG C.Emulsion after reaction obtains solid phase containing magnesium after filtering.Contain
Magnesium solid phase calcines 1h at 1000 DEG C, obtains magnesium cement activated magnesia.
Analyzing resulting active oxidation content of magnesium through hydration method is 35.5%.According to activated magnesia: magnesium sulfate: water rubs
, than being 4:1:20, the 28 days intensity of magnesium cement of preparation is 82MPa for you.
Embodiment 3:
Regenerative micro powder is the same as example 1
Magnesium cement is prepared with activated magnesia:
As shown in Figure 1, the magnesium chloride solution for being 20% with 500 parts of mass fractions mixes by 50 parts of concrete regenerating micro mists
Obtain emulsion.Emulsion is heated to reacting 16h at 80 DEG C.Emulsion after reaction obtains solid phase containing magnesium after filtering.Containing magnesium
Solid phase calcines 2h at 600 DEG C, obtains magnesium cement activated magnesia.
Analyzing resulting active oxidation content of magnesium through hydration method is 33.2%.According to activated magnesia: greening magnesium: water rubs
, than being 7:1:20, the 28 days intensity of magnesium cement of preparation is 90MPa for you.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (3)
1. a kind of method of concrete regenerating micro mist production magnesium cement activated magnesia, the described method comprises the following steps:
1) prepared by lotion:
By 10~50 parts of concrete regenerating micro mists, emulsion is mixed to get with 20~1000 parts of magnesium chloride solutions；
2) prepared by solid phase containing magnesium:
Emulsion is heated to reacting 12h~for 24 hours at 50~100 DEG C, and the emulsion after reaction obtains solid phase containing magnesium after filtering；
3) magnesium cement activated magnesia is obtained:
Solid phase containing magnesium calcines 1h~6h at 400~1000 DEG C, obtains magnesium cement activated magnesia；
By mass percentage, the concrete regenerating micro mist chemical composition are as follows: CaO 47.3%, SiO236.5%, Al2O3
10.1%, MgO 2.5%, Fe2O31.6%, Na2O 0.3%, SO31.2%.
2. the method for concrete regenerating micro mist production magnesium cement activated magnesia according to claim 1, which is characterized in that
The concrete regenerating micro mist is that waste and old concrete is crushed, is sieved to obtain the powder that partial size is less than 0.15mm.
3. the method for concrete regenerating micro mist production magnesium cement activated magnesia according to claim 1, which is characterized in that
The magnesium chloride solution is that salt lake mentions potassium chloride by-product of magnesium chloride and dissolves the solution that resulting mass fraction is 10%~30%.
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| CN201710542238.0A CN107311491B (en) | 2017-07-05 | 2017-07-05 | A kind of method of concrete regenerating micro mist production magnesium cement activated magnesia |
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| CN107311491A CN107311491A (en) | 2017-11-03 |
| CN107311491B true CN107311491B (en) | 2019-09-20 |
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| CN113213800B (en) * | 2021-05-18 | 2022-08-09 | 盐城工学院 | Activation method of magnesium oxychloride cement product waste and application thereof |
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| TWI491579B (en) * | 2010-12-21 | 2015-07-11 | Ruentex Eng & Constr Co Ltd | A cementation method of low calcium fly ash in room temperature |
| CN102432207A (en) * | 2011-08-30 | 2012-05-02 | 云南华威废弃物资源化有限公司 | Construction regenerated binding material prepared from construction garbage and preparation method thereof |
| CN102616815A (en) * | 2012-02-23 | 2012-08-01 | 中国科学院青海盐湖研究所 | Method for preparing calcined dolomite for silicothermic process magnesium production by aid of carbide slag and bischofite |
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