CN114685139B - Water-resistant type magnesium oxysulfide plate - Google Patents
Water-resistant type magnesium oxysulfide plate Download PDFInfo
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- CN114685139B CN114685139B CN202210427827.5A CN202210427827A CN114685139B CN 114685139 B CN114685139 B CN 114685139B CN 202210427827 A CN202210427827 A CN 202210427827A CN 114685139 B CN114685139 B CN 114685139B
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/10—Burned or pyrolised refuse
- C04B18/105—Gaseous combustion products or dusts collected from waste incineration, e.g. sludge resulting from the purification of gaseous combustion products of waste incineration
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- 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
- C04B20/023—Chemical treatment
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
- E04B1/665—Sheets or foils impervious to water and water vapor
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- 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
- C04B2111/00017—Aspects relating to the protection of the environment
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The application specifically discloses a water-fast type sulphur oxygen magnesium board. The water-resistant magnesium oxysulfate plate is formed by curing modified slurry, wherein the modified slurry comprises the following raw materials: 1.48-2.96 kg of light burned magnesia powder, 0.57-1.14 kg of heptahydrate magnesium sulfate powder, 0.75-1.12 kg of modified fly ash, 0.001-0.01 kg of dispersant, 0.08-0.13 kg of chelate resin taking nitrogen as coordination atoms and 0.025-0.05 kg of waterproof agent are contained in each liter of water; the content of magnesium oxide in the light-burned magnesium oxide is not less than 60wt%, and the fly ash is obtained by plasma irradiation of a blend compounded by waste incineration fly ash and zinc oxide. In the application, the waste incineration fly ash is treated in advance, the content of chloride ions of the waste incineration fly ash is reduced, and meanwhile, the waste incineration fly ash is matched with a dispersing agent, chelating resin and a waterproof agent for use, so that the waste incineration fly ash can be recycled to the magnesium oxysulfate plate, the magnesium oxysulfate plate overcomes the difficulty of moisture absorption and halogen return, and the waste incineration fly ash has good water resistance.
Description
Technical Field
The application relates to the technical field of building materials, in particular to a water-resistant magnesium oxysulfate plate.
Background
The magnesium oxysulfate plate is a light gel material with certain strength, which is formed by mixing, stirring, coagulating and hardening light-burned magnesium oxide and magnesium sulfate solution with proper concentration. The development of the magnesium oxysulfate plate in the field of building materials is limited due to the defects of low strength, poor water resistance and overhigh shrinkage rate.
In the related technology, the magnesium oxysulfate plate is modified by adopting the following technical scheme: citric acid is taken as a modifier, and a new phase 5Mg (OH) appears in the magnesium oxysulfate material through the strong chelation of the citric acid on magnesium ions 2 ·MgSO 4 ·7H 2 O (517 phase for short), but the magnesium oxysulfate plate modified by citric acid is only improved in mechanical property, and sulfur is caused by the fact that a plurality of pore structures still exist in the magnesium oxysulfate plateThe water resistance of the MgO board is not obviously improved.
Similarly, magnesium oxide as a modifier can play a certain role in enhancing, but has the following defects: firstly, the addition amount needs to be strictly controlled, and when the addition amount of the magnesium oxide is too high, the Mg element is Mg (OH) 2 The magnesium oxysulfate plate has the form of (1), so that the mechanical property of the magnesium oxysulfate plate is not increased or decreased; when the addition amount is too small, the improvement on the mechanical property of the magnesium oxysulfate plate is limited; second, even at an appropriate amount, the softening coefficient of the MgO-oxysulfate is only 0.24, and the water resistance of the MgO-oxysulfate after modification is still insufficient.
In view of the above-mentioned related art, when the magnesium oxysulfate plate is applied to a long-term high-humidity environment such as a natatorium, a mine, etc., the applicant believes that the magnesium oxysulfate plate modified with the above modifier does not satisfy the use requirements in terms of water resistance.
Disclosure of Invention
In order to solve the problem of poor water resistance of magnesium oxysulfate plates, the application provides a water-resistant magnesium oxysulfate plate.
The application provides a water-fast type sulphur oxygen magnesium board adopts following technical scheme:
a water-resistant magnesium oxysulfide plate is characterized in that base cloth containing an alkali-resistant coating is arranged on two sides of a vertical mold in the thickness direction, modified slurry is poured into the vertical mold, and the modified slurry is solidified and solidified for forming;
the modified slurry comprises the following raw materials in parts by weight:
1.48-2.96 kg of light burned magnesia powder, 0.57-1.14 kg of heptahydrate magnesium sulfate powder, 0.75-1.12 kg of modified fly ash, 0.001-0.01 kg of dispersant, 0.08-0.13 kg of chelate resin taking nitrogen as coordination atoms and 0.025-0.05 kg of waterproof agent are contained in each liter of water;
the content of active magnesium oxide in the light-burned magnesium oxide is not less than 60wt%;
the fly ash subjected to modification treatment comprises the following modification steps: and (3) grinding and blending the waste incineration fly ash and zinc oxide together, and performing plasma irradiation on the obtained blend to obtain the modified fly ash.
Through adopting above-mentioned technical scheme, this application forms the sulphur oxygen magnesium board of high compressive strength and high flexural strength through the base cloth that contains alkali resistant coating and the cooperation of modified thick liquids. The modified slurry has synergistic effect in improving water resistance by compounding the modified fly ash, the dispersant, the chelating resin and the waterproof agent, so that the softening coefficient of the magnesium oxysulfate plate can reach more than 0.8.
The specific principle is as follows: firstly, modifying the waste incineration ash, wherein zinc oxide is irradiated by ultraviolet rays in the plasma irradiation process to induce and generate photoproduction cavities and photoproduction electrons, the photoproduction cavities can directly oxidize chloride ions to convert the chloride ions into chlorine, the content of the chloride ions in the modified fly ash is extremely low, the fly ash is added into modified slurry, and the contained few chloride ions are adsorbed and cured by a gel material in the modified slurry, so that the water resistance of a magnesium oxysulfate plate is not adversely affected; meanwhile, as the fly ash contains active oxides such as silicon oxide, magnesium oxide, aluminum oxide, calcium oxide and the like, the generation of gel materials in the magnesium oxysulfate plate can be promoted, so that the internal structure of the magnesium oxysulfate plate is compact.
Secondly, the pH value range of the modified slurry fluctuates between 8 and 9.5 and is alkalescent, so that the chelate resin has good stability in the modified slurry and complete structure, can play a role in filling, optimizes the internal structure of the magnesium oxysulfate plate and reduces the porosity of the magnesium oxysulfate plate; on the other hand, nitrogen atoms contained in the chelate resin can provide lone-pair electrons, and can be combined with empty orbitals provided by heavy metal ions (such as zinc ions, lead ions, nickel ions, chromium ions, cadmium ions and the like) in the fly ash to generate coordination, so that the heavy metal ions in the fly ash are enriched in the chelate resin, and the heavy metal ions in the magnesium oxysulfate plate are difficult to dissolve out.
Furthermore, the dispersant can promote the dispersion of the hydrophobic chelate resin in the modified slurry through the hydrogen bond action with the nitrogen atoms contained in the chelate resin, further optimize the internal structure of the magnesium oxysulfate plate, and improve the adsorption rate of heavy metal ions in the modified slurry.
And macromolecular hydrophobic substances contained in the waterproof agent can block the pores in the magnesium oxysulfate plate, so that the contact angle of the surface of the magnesium oxysulfate plate is increased, and the possibility that water invades the interior of the magnesium oxysulfate plate is further reduced.
To sum up, this application realizes its recycle after the waste incineration fly ash preliminary treatment, replaces the part to light burn magnesium oxide, and the difficult point that thereby can not be applied to the magnesium oxysulfide board because contain a large amount of chloride ions in the waste incineration ash content has been overcome in the cooperation between each material to the sulphur oxysulfate board energy-concerving and environment-protective that makes, and the superior performance has wide market.
Preferably, the modified slurry comprises the following raw materials:
each liter of water contains 2.12-2.30 kg of light-burned magnesia powder, 0.8-0.9 kg of heptahydrate magnesium sulfate powder, 0.8-1.0 kg of modified fly ash, 0.001-0.01 kg of cyclodextrin, 0.08-0.13 kg of chelate resin taking nitrogen as a coordination atom, and 0.25-0.5 kg of waterproof agent.
By adopting the technical scheme, the weight ratio of the light-burned magnesium oxide, the magnesium sulfate heptahydrate powder and the fly ash is optimized, so that the internal structure of the magnesium oxysulfate plate is further optimized, and the mechanical property is further enhanced.
Preferably, the weight ratio of the waste incineration fly ash to the zinc oxide in the modification step of the modified fly ash is 1000 (2-5), the action voltage of plasma irradiation is 20-60 kV, the action atmosphere is oxygen, and the irradiation time is 0.5-1 h.
By adopting the technical scheme, the weight ratio of the waste incineration fly ash to the zinc oxide is controlled, the content of chloride ions in the fly ash subjected to modification treatment is reduced as far as possible, and meanwhile, the proportion of the zinc oxide in the fly ash subjected to modification treatment is reduced, so that the content of heavy metals in a magnesium oxysulfate plate is reduced; meanwhile, the technological parameters of plasma irradiation are optimized, and the production cost is reduced while the chloride ions are fully oxidized.
Preferably, the content of active magnesium oxide in the light-burned magnesium oxide is 65 to 75wt%.
The method can reduce the content of active magnesium oxide on the premise of ensuring that the magnesium oxysulfate plate has better compressive strength and water resistance, namely, the low-quality light-burned magnesium oxide can be used for obtaining the high-water-resistance magnesium oxysulfate plate, so that the cost is further saved. The content of the active magnesium oxide is reduced, but the active magnesium oxide is matched with the treated fly ash, so that the setting time of the modified slurry is moderate, the internal structure can still be kept compact, and the quality of the active magnesium oxide is reduced, but the water resistance of the magnesium oxysulfate is hardly influenced.
Preferably, the dispersant is cyclodextrin and/or chitosan. More preferably, the dispersant is beta-cyclodextrin.
By adopting the technical scheme, the cyclodextrin and the chitosan have excellent water retention and thickening effects after absorbing water, and in a humid environment, water invades the magnesium oxysulfate plate, and substances such as heavy metal ions, chloride ions and the like in the magnesium oxysulfate plate are not easy to migrate and separate out.
Optionally, the chelating resin with nitrogen as a coordinating atom is an aminophosphonic acid type resin and/or an iminodiacetic acid type chelating resin.
Preferably, the particle size of the chelate resin having nitrogen as a coordinating atom is 0.35 to 0.55mm.
Through adopting above-mentioned technical scheme, optimize the particle diameter of chelate resin, make the dispersion that chelate resin can be comparatively abundant in the modified thick liquids on the one hand, on the other hand makes the filling effect of chelate resin better to the water proofness and the compressive strength of thiomagnesium board have further been improved.
Preferably, the water-proofing agent is one or more of organosilicon water-proofing agent, inorganic aluminum salt water-proofing agent and inorganic silicon water-proofing agent.
Preferably, the waterproof agent is an inorganic aluminum salt waterproof agent.
By adopting the technical scheme, a hydration product formed by the reaction of calcium oxide in the fly ash in the modified slurry can further react with the inorganic aluminum salt waterproof agent to generate double-salt calcium sulphoaluminate with certain expansibility, so that the double salt expands when the magnesium oxysulfate plate is invaded by water to block pores, hinder the invasion of the water and further improve the water resistance of the magnesium oxysulfate plate.
In summary, the present application has the following beneficial effects:
1. the waste incineration fly ash can be applied to the magnesium oxysulfate plate due to the fact that the waste incineration fly ash is subjected to plasma irradiation treatment and is matched with the dispersing agent, the chelating resin and the waterproof agent for use, and the dispersing agent, the chelating resin and the waterproof agent have a synergistic effect in the magnesium oxysulfate plate, so that the water resistance of the magnesium oxysulfate plate is not reduced or increased, the mechanical property is excellent, and the magnesium oxysulfate plate is safe and non-toxic and does not have heavy metal ions to be separated out.
2. In the application, the light-burned magnesia with the active magnesia content of 65-75 wt% is preferably adopted as a raw material, so that the production cost is further reduced on the premise of ensuring the mechanical property and the water resistance of the magnesium oxysulfide plate, and the low-quality magnesia can also be applied to the preparation of the magnesium oxysulfide plate, thereby saving energy and protecting environment.
3. The fly ash subjected to modification treatment has the calcium oxide content of more than or equal to 28wt% and is compounded with an inorganic aluminum salt waterproof agent for use, and the generated double-salt calcium sulphoaluminate expands when water invades to block pores, so that the invasion of the water is hindered, and the water resistance of the magnesium oxysulfate plate is further improved.
Detailed Description
Unless otherwise specified, the sources of the following examples and comparative examples are shown below.
Base cloth containing alkali-resistant coating: the alkali-resistant coated mesh fabric comes from Shanghai defense, and the alkali-resistant breaking strength (warp and weft) is more than or equal to 1000N/50mm;
light-burned magnesium oxide: the active magnesia content is 85wt percent, and is sourced from Weifang Kaibo magnesium salt Co., ltd; the content of active magnesium oxide is 75wt%, and the active magnesium oxide is sourced from Jiang Xiao group chemical industry limited company; the content of active magnesium oxide is 65wt percent, and the active magnesium oxide is sourced from Jiang Xiao group chemical industry Co., ltd; the active magnesia content is 60wt%, and is sourced from Jiang Xiao chemical industry Co.
Waste incineration fly ash:
derived from a certain refuse incineration plant I, the concrete composition is as follows: caO 17.41wt%, siO 2 28.97wt％、Fe 2 O 3 12.42wt％、Al 2 O 3 5.61wt%; 7.92wt% of MgO; 25.74wt% of loss on ignition and the balance of heavy metal oxide or chloride;
Sourcein a certain waste incineration plant II, the concrete composition is as follows: caO 28.37wt%, siO 2 22.30wt％、Fe 2 O 3 5.32wt％、Al 2 O 3 6.33wt%; mgO 4.72wt%; the loss on ignition is 22.04wt percent, and the balance is heavy metal oxide or chloride.
Beta-cyclodextrin: high purity, derived from Shanghai-sourced leaf Biotech, inc.;
the iminodiacetic acid type chelating resin is Mitsubishi CR11, and three different granularities are customized, specifically 0.10-0.25 mm, 0.3-0.55 mm and 1-5 mm;
an organosilicon waterproofing agent: 30wt% of solid content, 1213465 from chemical Limited of Yingyu of Jinan;
inorganic aluminum salt waterproofing agent: is from Beijing Shunji engineering and engineering technology Limited.
Examples of modified fly ash production
Preparation example 1
The fly ash subjected to modification treatment is prepared by the following steps:
taking waste incineration fly ash (CaO content is 17.41 wt%) from a waste incineration plant I, adding zinc oxide, putting the waste incineration fly ash and the zinc oxide in a grinding machine together according to a weight ratio of 1000;
and (3) treating the blend by using low-temperature plasma equipment, and setting the action voltage of plasma irradiation to be 20kV and the irradiation time to be 1h under the oxygen atmosphere to obtain the modified fly ash.
Preparation example 2
A fly ash subjected to modification treatment is different from that of preparation example 1 in that the fly ash from waste incineration is derived from a waste incineration plant II (CaO content is 28.37 wt%).
Preparation example 3
A modified fly ash differs from the fly ash obtained in preparation example 2 in that the weight ratio of the waste incineration fly ash to the zinc oxide is 1000.
Preparation example 4
A fly ash subjected to modification treatment is different from that of preparation example 2 in that the action voltage of plasma irradiation is 60kV, and the irradiation time is 0.5h.
Examples
Example 1
The water-resistant magnesium oxysulfate board uses a modified slurry formula as follows:
1.48kg of light-burned magnesia powder (the content of active magnesia is 85wt percent), 0.57kg of magnesium sulfate heptahydrate, 0.75kg of fly ash which is prepared by the preparation example 1 and is subjected to modification treatment, 0.001kg of beta-cyclodextrin, 0.08kg of chelating resin Mitsubishi CR11 (the granularity is 0.10-0.25 mm) and 0.025kg of organic silicon waterproof agent are added into each liter of water;
the preparation method comprises the following steps:
weighing raw materials according to the formula of the modified slurry, adding light-burned magnesium oxide, magnesium sulfate heptahydrate powder, the modified fly ash prepared in preparation example 1, beta-cyclodextrin, chelating resin Mitsubishi CR11 and an organic silicon waterproof agent into water, and stirring and blending at the rotating speed of 200rpm to obtain the modified slurry;
laying alkali-resistant coated mesh cloth in a mould, arranging one layer of alkali-resistant coated mesh cloth on two sides of the thickness direction of the mould, filling modified slurry in the mould, and demoulding and maintaining after the modified slurry is solidified to obtain the magnesium oxysulfide plate.
Examples 2 to 4
A water-fast magnesium oxysulfate sheet differing from example 1 in the composition of the modified slurry, and the specific composition is shown in table 1 below.
TABLE 1 composition of modified slurries
Examples 5 to 7
A water-resistant magnesium oxysulfate plate, which is different from that in example 3 in that the fly ash is from the following specific sources: the fly ash of example 5 was derived from preparation 2; the fly ash of example 6 was derived from preparation example 3; the fly ash of example 7 was derived from preparation 4.
Examples 8 to 10
A water-resistant magnesium oxysulfate sheet differing from example 3 in the content of active magnesium oxide in the light-burned magnesium oxide: the content of active magnesium oxide in the light-burned magnesia powder of example 8 was 60% by weight; the content of active magnesium oxide in the light-burned magnesium oxide powder of example 9 was 65wt%; the content of active magnesium oxide in the light-burned magnesia powder of example 10 was 75% by weight.
Example 11
A water-resistant MgO oxysulfide board differing from that of example 3 in that the active MgO content in the light-burned MgO powdered material is 65wt%, and fly ash is derived from production example 4.
Example 12
A water-resistant MgO oxysulfate plate which is different from that of example 11 in that the particle size of Mitsubishi CR11, which is a chelate resin, is 1 to 5mm.
Example 13
A water-resistant magnesium oxysulfate plate differing from that in example 11 in that a particle diameter of chelate resin Mitsubishi CR11 was 0.3 to 0.55mm.
Example 14
A water-resistant magnesium oxysulfate plate differing from that of example 11 in that the water repellent was an inorganic aluminum salt water repellent.
Comparative example
Comparative examples 1 to 4
A magnesium oxysulfate board, which is different from example 1 in the composition of the modified slurry, and the specific composition is shown in table 2 below.
TABLE 2 composition of modified slurries
Comparative example 5
A magnesium oxysulfate plate, which is different from example 1 in that fly ash from incineration of garbage is directly added to a modified slurry without plasma irradiation.
Performance test
Samples of a magnesium oxysulfate board having dimensions of 40mm × 40mm × 160mm and a curing age of 28d were prepared according to the preparation methods of examples 1 to 14 and comparative examples 1 to 5.
Mechanical properties: GB/T17671-1999 detects the compressive strength and the rupture strength of a magnesium oxysulfate plate sample;
and (3) softening coefficient determination: taking two groups of same samples, curing for 28 days, testing the compressive strength of one group, immersing the other group of samples in distilled water at 25 ℃ for 3 days for strength testing, and calculating the softening coefficient R according to the following formula f ：
Wherein R is (w,7) -compressive strength of the soaked 3d samples after curing for 28 d; r (w,28) Compressive strength of the sample after curing for 28d.
And (3) water absorption measurement: and (2) placing the thiomagnesium plate sample at the constant temperature of 40 ℃ and drying to constant weight, immersing the thiomagnesium plate sample in water for 10 days, taking out the thiomagnesium plate sample, wiping off surface moisture, weighing again, and calculating the water absorption according to the following formula: absorption rate = (M) 2 -M 1 )/M 1 ×100％；M 2 For the weight of the sample after 10 days of absorption, M 1 The weight of the sample dried to constant weight.
And (3) heavy metal content detection: detecting soluble lead, soluble chromium, soluble cadmium and soluble nickel according to GB/T30810-2014; the content of soluble lead is less than or equal to 90mg/L, the content of soluble chromium is less than or equal to 60mg/L, the content of soluble cadmium is less than or equal to 75mg/L, and the content of soluble nickel is less than or equal to 60mg/L, and the content is in a qualified range.
Detection method
TABLE 3 mechanical property, softening coefficient and water absorption rate test of magnesium oxysulfate plate sample
TABLE 4 detection of heavy metal ion flooding
Note that: "/" indicates that the soluble heavy metal ion was not detected.
The moisture and halogen absorption phenomena occur in the comparative examples 1 to 5, the moisture and halogen absorption is slight in the comparative example 2, and the moisture and halogen absorption is serious in the comparative examples 1 and 5; in examples 1 to 14, no moisture absorption and halogen regain occurred.
Combining example 1 and comparative examples 1-5 and tables 3-4, it can be seen that:
firstly, the waste incineration fly ash is subjected to plasma irradiation treatment, and then the beta-cyclodextrin, the Mitsubishi CR11 and the waterproof agent are used, so that the heavy metal ions which can be dissolved out from the magnesium oxysulfate plate can be reduced to be within the safety standard, the reduction amplitude is obvious, and the concentration of the heavy metal ions which can be dissolved out is only 1/3 of the safety standard.
Secondly, the magnesium oxysulfate board prepared by the method is low in softening coefficient and water absorption rate and has excellent water resistance, and the fly ash, the dispersing agent, the chelating resin and the waterproof agent which are subjected to modification treatment are proved to have a synergistic effect in the aspect of improving the water resistance.
As can be seen by combining examples 3-11 with tables 3-4:
firstly, the content of the active magnesium oxide is reduced, so that the mechanical property, the water resistance and the safety of the magnesium oxysulfate plate are hardly influenced, and the low-quality magnesite can be developed and utilized, so that the energy is saved and the environment is protected.
Secondly, the content of calcium oxide and the content of active magnesium oxide in the fly ash are adjusted, so that the synergistic effect can be achieved in the aspects of improving the mechanical property and the water resistance of the magnesium oxysulfate board.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A water-resistant type magnesium oxysulfide board is characterized in that base cloth containing an alkali-resistant coating is arranged on two sides of a vertical die in the thickness direction, modified slurry is poured into the vertical die, and the modified slurry is solidified and formed;
the modified slurry comprises the following raw materials in parts by weight:
each liter of water contains 1.48 to 2.96kg of light-burned magnesia powder, 0.57 to 1.14kg of heptahydrate magnesium sulfate powder, 0.75 to 1.12kg of modified fly ash, 0.001 to 0.01kg of dispersant, 0.08 to 0.13kg of chelate resin taking nitrogen as coordination atoms and 0.025 to 0.05kg of waterproof agent;
the content of active magnesium oxide in the light-burned magnesium oxide is not less than 60wt%;
the dispersing agent is cyclodextrin and/or chitosan;
the fly ash subjected to modification treatment comprises the following modification steps: and (2) grinding and blending the waste incineration fly ash and zinc oxide together, wherein the weight ratio of the waste incineration fly ash to the zinc oxide is 1000-5, and subjecting the obtained blend to plasma irradiation to obtain the modified fly ash.
2. The water-resistant magnesium oxysulfate plate according to claim 1, characterized in that: the modified slurry comprises the following raw materials in parts by weight:
each liter of water contains 2.12-2.30 kg of light-burned magnesia powder, 0.8-0.9 kg of magnesium sulfate heptahydrate powder, 0.8-1.0 kg of modified fly ash, 0.001-0.01 kg of cyclodextrin, 0.08-0.13 kg of chelate resin taking nitrogen as a coordination atom, and 0.025-0.05 kg of waterproof agent.
3. The water-resistant magnesium oxysulfate plate of claim 1, wherein: the content of active magnesium oxide in the light-burned magnesium oxide is 65-75 wt%.
4. The water-resistant magnesium oxysulfate plate of claim 1, wherein: the content of calcium oxide in the fly ash subjected to modification treatment is more than or equal to 28wt%.
5. The water-resistant magnesium oxysulfate plate of claim 1, wherein: in the modification step of the fly ash subjected to modification treatment, the action voltage of plasma irradiation is 20-60 kV, and the irradiation time under oxygen atmosphere is 0.5-1 h.
6. The water-resistant magnesium oxysulfate plate of claim 1, wherein: the chelating resin with nitrogen as a coordination atom is aminophosphonic acid type resin and/or iminodiacetic acid type chelating resin.
7. The water-resistant magnesium oxysulfate plate of claim 6, wherein: the particle size of the chelate resin taking nitrogen as a coordination atom is 0.35-0.55 mm.
8. The water-resistant magnesium oxysulfate plate according to claim 1, characterized in that: the waterproof agent is one or more of an organic silicon waterproof agent, an inorganic aluminum salt waterproof agent and an inorganic silicon waterproof agent.
9. The water-resistant magnesium oxysulfate plate of claim 1, wherein: the waterproof agent is an inorganic aluminum salt waterproof agent.
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