CN113213800B - Activation method of magnesium oxychloride cement product waste and application thereof - Google Patents
Activation method of magnesium oxychloride cement product waste and application thereof Download PDFInfo
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- CN113213800B CN113213800B CN202110541744.4A CN202110541744A CN113213800B CN 113213800 B CN113213800 B CN 113213800B CN 202110541744 A CN202110541744 A CN 202110541744A CN 113213800 B CN113213800 B CN 113213800B
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- oxychloride cement
- magnesium oxychloride
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- powder
- cement product
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- 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
- C04B28/30—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 magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses magnesium oxychloride waterThe activation method of waste material of clay products uses waste material of magnesium oxychloride cement products as raw material, and adopts the processes of crushing, ball-milling and grinding to obtain powder body, then makes it undergo the processes of heat activation, its activation temperature is controlled at 650-850 deg.C and activation time is controlled at 0.5-2.5 h. The invention realizes the reutilization of the waste materials of the magnesium oxychloride cement product and reduces the environmental pollution. The specific surface area of the activated waste material of the magnesium oxychloride cement product is 2900- 2 The activity index of 7d reaches 48-97 percent, the activity index of 28d reaches 58-104 percent, and the magnesium oxychloride cement can completely or partially replace the original magnesium oxide powder, is used for preparing the magnesium oxychloride cement material, and has good social benefit and economic benefit.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an activation method of magnesium oxychloride cement product waste and application thereof.
Background
With the rapid development of the building industry in China, real estate has more and more demands on environment-friendly building floors, but the traditional floors are made of natural wood, consume a large amount of natural forests, or are made of wood chip boards, and generate more formaldehyde pollution. New materials must be sought for replacement. The magnesium oxychloride cement material is the first choice of artificial floors and has been widely used for many reasons, such as fast setting and hardening, high strength, corrosion resistance, simple forming process, etc. However, the Magnesium Oxychloride Cement (MOC) floor processing process generates about 10% -25% of leftover materials, and the leftover materials contain chloride ions, so that the treatment is difficult, the development of enterprises is severely restricted, and the potential harm is brought to the environment.
At present, the treatment and the reutilization of the waste materials of the magnesium oxychloride cement products are not reported, so that the effective treatment and the recycling of the waste materials become an urgent need of manufacturers of the magnesium oxychloride cement products.
Disclosure of Invention
Aiming at the problem that the waste materials generated in the production and processing processes of magnesium oxychloride cement products in the prior art are difficult to treat, the invention provides the method for activating the waste materials of the magnesium oxychloride cement products, which is simple to operate, can reduce the environmental pollution, can recycle the activated powder, completely or partially replaces the magnesium oxide raw material to prepare the magnesium oxychloride cement products, and has remarkable economic benefit.
The invention is realized by the following technical scheme:
a method for activating magnesium oxychloride cement product waste comprises the following steps:
(1) crushing the magnesium oxychloride cement product waste into particles with the particle size of less than 3cm, and then ball-milling for 15-40min to obtain waste powder;
(2) and (3) putting the waste powder into a calcining furnace, heating to 650-850 ℃ for thermal activation, and cooling to room temperature after the thermal activation is finished to obtain the magnesium oxychloride cement product waste activated powder.
Further, in the step (1), the ball milling parameters are as follows: the ball-material ratio is 20, and the revolution number of the mill is 48 r/min.
Further, in the step (1), the specific surface area of the waste powder is 2800- 2 /g。
Further, in the step (2), the temperature rise rate is 5 ℃/min.
Further, in the step (2), the thermal activation time is 0.5-4 h.
The application of the waste activation powder of the magnesium oxychloride cement product prepared by the method in preparing the magnesium oxychloride cement material comprises the following steps: mixing 0-90 parts of light-burned magnesia raw powder, 10-100 parts of magnesium oxychloride cement product waste activation powder, 80-100 parts of 35% magnesium chloride solution, 10-30 parts of water, 10-20 parts of wood powder and 0-3 parts of modifier, and stirring and forming to obtain a magnesium oxychloride cement material; the parts are all parts by weight.
Further, the modifier is one or a mixture of more of phosphoric acid, potassium dihydrogen phosphate, sodium dihydrogen phosphate and dipotassium hydrogen phosphate.
The invention has the beneficial effects that: the invention provides a method for carrying out thermal activation treatment and recycling on waste materials (grinding powder, leftover materials and the like) of magnesium oxychloride cement products, which realizes the recycling of the waste materials of the magnesium oxychloride cement products, reduces the environmental pollution, and has the specific surface area of 2900- 2 The activity index of 7d reaches 48-97 percent, the activity index of 28d reaches 58-104 percent, and the magnesium oxychloride cement can completely or partially replace the original magnesium oxide powder, is used for preparing the magnesium oxychloride cement material, and has good social benefit and economic benefit.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In the following examples, the waste material of magnesium oxychloride cement product used was from Zhejiang Tianzheng science and technology Limited, and the halogen chips and potassium dihydrogen phosphate were commercially available.
Example 1
A method for activating magnesium oxychloride cement product waste comprises the following steps:
(1) crushing the waste material of the magnesium oxychloride cement product into particles below 3cm, and then performing ball milling (the ball-material ratio is 20, the rotation number of a mill is 48r/min) for 20min to obtain the magnesium oxychloride cement product with the specific surface area of 3000cm 2 A waste powder per gram;
(2) and (3) putting the waste powder into a calcining furnace, heating to 700 ℃ at the speed of 5 ℃/min for thermal activation, keeping the temperature for 1h, and cooling to room temperature to obtain the magnesium oxychloride cement product waste activation powder.
Example 2
A method for activating magnesium oxychloride cement product waste comprises the following steps:
(1) crushing the waste material of the magnesium oxychloride cement product into particles with the diameter of less than 3cm, and then ball-milling (the ball-material ratio is 20, the rotation number of a mill is 48r/min) for 20min to obtain the magnesium oxychloride cement product with the specific surface area of 3000cm 2 A waste powder per gram;
(2) and (3) putting the waste powder into a calcining furnace, heating to 750 ℃ at the speed of 5 ℃/min for thermal activation, keeping the temperature for 1h, and cooling to room temperature to obtain the magnesium oxychloride cement product waste activation powder.
Example 3
A method for activating magnesium oxychloride cement product waste comprises the following steps:
(1) crushing the waste material of the magnesium oxychloride cement product into particles with the particle size of less than 3cm, and then carrying out ball milling for 20min (the ball-material ratio is 20, and the revolution of a mill is 48r/min) to obtain the magnesium oxychloride cement product with the specific surface area of 3000cm 2 Per gram of waste powder;
(2) and (3) putting the waste powder into a calcining furnace, heating to 800 ℃ at the speed of 5 ℃/min for thermal activation, keeping the temperature for 1h, and cooling to room temperature to obtain the magnesium oxychloride cement product waste activation powder.
The magnesium oxychloride cement product waste activation powder prepared in example 1, example 2 and example 3 was tested for activity index by the following test methods: 100g of activated powder, 88g of brine and 20g of water are uniformly mixed, the slurry is injected into a mold with the size of 20mm multiplied by 100mm for molding, the mold is demolded after 24h of molding, the slurry is maintained to be in an age period, the compression strength of the slurry is tested and compared with the strength of a reference sample formula 1 (the reference sample formula 1 is 100g of light-burned magnesium oxide, 88g of brine and 20g of water), the activity index of each example 7d and 28d is calculated, and the results are shown in the following table 1:
TABLE 1
As can be seen from table 1, the 7d, 28d strength of example 1 is overall comparable to baseline formulation 1, and the 28d activity index of example 1 can reach 104%. It is known that the activity of the activated powder is substantially the same as that of the light-burned magnesia powder when the activation temperature is 700 ℃ and the holding time is 1 hour.
Application example 1
The waste activated powder of the magnesium oxychloride cement product prepared in the example 1 is used for preparing the magnesium oxychloride cement material: 100g of activated powder, 88g of magnesium chloride solution (with the mass concentration of 35 percent), 20g of water, 16g of wood powder and 1g of monopotassium phosphate are mixed, stirred and formed, and the magnesium oxychloride cement material is obtained.
Application example 2
The waste activated powder of the magnesium oxychloride cement product prepared in the example 2 is used for preparing the magnesium oxychloride cement material: 100g of activated powder, 88g of magnesium chloride solution (with the mass concentration of 35 percent), 20g of water, 16g of wood powder and 1g of monopotassium phosphate are mixed, stirred and formed, and the magnesium oxychloride cement material is obtained.
Application example 3
The waste activated powder of the magnesium oxychloride cement product prepared in the example 1 is used for preparing the magnesium oxychloride cement material: 81g of light-burned magnesia powder, 19g of activated powder, 88g of magnesium chloride solution (with the mass concentration of 35%), 20g of water, 16g of wood powder and 1g of monopotassium phosphate are mixed, stirred and formed, and the magnesium oxychloride cement material is obtained.
Application example 4
The waste activated powder of the magnesium oxychloride cement product prepared in the example 2 is used for preparing the magnesium oxychloride cement material: 81g of light-burned magnesia powder, 19g of activated powder, 88g of magnesium chloride solution (with the mass concentration of 35%), 20g of water, 16g of wood powder and 1g of monopotassium phosphate are mixed, stirred and formed, and the magnesium oxychloride cement material is obtained.
Application example 5
The waste activated powder of the magnesium oxychloride cement product prepared in the example 3 is used for preparing the magnesium oxychloride cement material: 81g of light-burned magnesia powder, 19g of activated powder, 88g of magnesium chloride solution (with the mass concentration of 35%), 20g of water, 16g of wood powder and 1g of monopotassium phosphate are mixed, stirred and formed, and the magnesium oxychloride cement material is obtained.
Comparative example
Mixing 100g of light-burned magnesia powder, 88g of brine, 20g of water, 16g of wood powder and 2.5g of modifier, stirring and forming to obtain the magnesium oxychloride cement material.
The magnesium oxychloride cement materials of the application examples 1 to 5 and the comparative example are made into 20mm multiplied by 100mm test pieces, and the test of the flexural strength, the compressive strength, the water absorption and the softening coefficient is carried out, wherein the test of the flexural strength, the compressive strength and the water absorption refers to JC/T747 glass fiber magnesium cement material Bowa and Riwa; the test method of the softening coefficient refers to JC/T568 magnesium oxychloride cement plate, and the test method of the softening coefficient is as follows: and (3) maintaining the test block to be at the age of 28d, immersing the test piece into water, wherein the water temperature is 20 ℃ (± 2 ℃), the water surface is about 30mm higher than the test piece, the test pieces are not mutually attached, taking out the test piece after 24h (+/-2 h), wiping off the surface water by using a wringed wet towel, and immediately carrying out the flexural strength and compressive strength tests within 1 h. The results are shown in table 2 below:
TABLE 2
It can be seen from the test data in table 2 that the strength of the test pieces of the magnesium oxychloride cement material of the application examples 1 and 2 is slightly lower than that of the comparative example, the water absorption is reduced, but the softening coefficient is greatly improved. The average water absorption of the test pieces in the application examples 3-5 is 3.9%, and the average water absorption of the pure chlorine oxygen magnesium cement test piece with the same proportion is 6.2%, so that the softening coefficient is greatly improved, and the strength is further improved.
Therefore, the activation and the reutilization of the magnesium oxychloride cement leftover material not only realizes the reutilization of the leftover material, but also has the characteristics of high strength, low water absorption and good water resistance. Effectively solves the problem that the leftover materials of the magnesium oxychloride cement board are difficult to treat in the production, recycles the leftover materials into the magnesium oxychloride cement product, and further improves the performance of the magnesium oxychloride cement product. Is suitable for being applied to a production system of magnesium oxychloride cement plate products.
Claims (6)
1. The method for activating the waste material of the magnesium oxychloride cement product is characterized by comprising the following steps of:
(1) crushing the magnesium oxychloride cement product waste into particles with the particle size of less than 3cm, and then ball-milling for 15-40min to obtain waste powder;
(2) putting the waste powder into a calcining furnace, heating to 650-850 ℃ for thermal activation, and cooling to room temperature after the thermal activation is finished to obtain magnesium oxychloride cement product waste activated powder;
in the step (1), the specific surface area of the waste powder is 2800- 2 /g；
In the step (2), the thermal activation time is 0.5-4 h.
2. The method for activating waste magnesium oxychloride cement product as claimed in claim 1, wherein in the step (1), the ball milling parameters are: the ball-material ratio is 20, and the revolution number of the mill is 48 r/min.
3. The method for activating waste magnesium oxychloride cement product of claim 1, wherein in the step (2), the temperature increase rate is 5 ℃/min.
4. Use of the activated powder of waste products of magnesium oxychloride cement manufactured by the process according to any one of claims 1 to 3 for the preparation of magnesium oxychloride cement material.
5. The application of claim 4, wherein the application method is as follows: mixing 0-90 parts of light-burned magnesia raw powder, 10-100 parts of magnesium oxychloride cement product waste activation powder, 80-100 parts of 35% magnesium chloride solution, 10-30 parts of water, 10-20 parts of wood powder and 0-3 parts of modifier, and stirring and forming to obtain a magnesium oxychloride cement material; the parts are all parts by weight.
6. The use of claim 5, wherein the modifier is one or more of phosphoric acid, potassium dihydrogen phosphate, sodium dihydrogen phosphate, and dipotassium hydrogen phosphate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1990413A (en) * | 2005-12-27 | 2007-07-04 | 尹小林 | Synthesis-reactivation technique for preparing inorganic coagulation material |
| JP5490104B2 (en) * | 2008-05-20 | 2014-05-14 | プロマト リサーチ アンド テクノロジー センター ナムローゼ フェンノートシャップ | Durable magnesium oxychloride cement and method therefor |
| CN104446061A (en) * | 2014-11-24 | 2015-03-25 | 中国科学院青海盐湖研究所 | Magnesium oxychloride cement and preparation method thereof |
| CN107311491B (en) * | 2017-07-05 | 2019-09-20 | 青海大学 | A kind of method of concrete regenerating micro mist production magnesium cement activated magnesia |
| CN110922156A (en) * | 2019-12-04 | 2020-03-27 | 王晓明 | Preparation method of environment-friendly, economical, high-temperature-resistant and high-strength fireproof door core board |
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