CN111635207A - Environment-friendly radiation-proof composite material and preparation method and application thereof - Google Patents
Environment-friendly radiation-proof composite material and preparation method and application thereof Download PDFInfo
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- CN111635207A CN111635207A CN202010511790.5A CN202010511790A CN111635207A CN 111635207 A CN111635207 A CN 111635207A CN 202010511790 A CN202010511790 A CN 202010511790A CN 111635207 A CN111635207 A CN 111635207A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization 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
- 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
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
- C04B40/0245—Steam hardening, e.g. in an autoclave including a pre-curing step not involving a steam or autoclave 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00025—Aspects relating to the protection of the health, e.g. materials containing special additives to afford skin protection
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00862—Uses not provided for elsewhere in C04B2111/00 for nuclear applications, e.g. ray-absorbing concrete
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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
- 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
- C04B2111/2092—Resistance against biological degradation
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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
- 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
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/52—Sound-insulating materials
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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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- 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 provides an environment-friendly radiation-proof composite material and a preparation method and application thereof. The environment-friendly radiation-proof composite material is prepared from the following raw materials: gold mine tailing slag, tourmaline, barite, mineral fiber, cement, desulfurized gypsum and fly ash. The invention adopts the tailing slag to replace part of the fly ash, and is matched with the tourmaline and the barite, thereby being beneficial to keeping the stable components of the slurry, reducing the production cost and protecting the environment. The calcium silicate board prepared by the composite material has high strength and meets the national standard of calcium silicate boards for buildings; as can be seen by a simulated leaching test, no harmful substance is dissolved out; the preparation method is simple and low in cost.
Description
Technical Field
The invention relates to the technical field of environment-friendly building materials, in particular to an environment-friendly radiation-proof composite material and a preparation method and application thereof.
Background
With the large-scale development of mineral resources, the geological ring of the mining areaThe environment is severely damaged. According to incomplete statistics, the existing mining tunnels of a plurality of mining areas are dozens of kilometers, and the area of a goaf exceeds 40km2And almost 3300 million tons of waste rocks and tailings are accumulated. Wherein, the annual discharged solid waste of the tailing slag accounts for 96.5 percent of the total amount of the generated solid waste, and the accumulated solid waste accounts for 99.5 percent of the total accumulated solid waste. The total discharge amount of mine wastewater is 359 ten thousand meters3A, causing serious environmental pollution. Due to the discharge of waste rocks and tailings, a plurality of geological environment problems are brought: firstly, a large amount of land is occupied by the stacking of the waste rocks and the tailings, and meanwhile, vegetation resources and natural landforms are also seriously deteriorated; the stockpiled tailings are subjected to a series of physical and chemical changes under the actions of weathering and rainwater leaching, harmful substances are generated, surrounding soil is polluted, and surface water and underground water are polluted; secondly, a large amount of tailings are piled up to be a high-potential artificial debris flow danger source, and serious casualty accidents, environmental pollution and great property loss are caused by dam-break disasters.
The calcium silicate board is a light, high-strength, moisture-proof, corrosion-proof and fireproof wall building material, and can be widely applied to fireproof partition boards, ceiling boards, air ducts, partition boards of various ships, fireproof doors and the like of high-rise and public buildings. The raw material for producing the calcium silicate board is generally compounded by natural gypsum powder, white cement, glue and glass fiber, quartz sand, diatomite, fly ash, sand dust, porcelain clay and the like can also be used, and the reinforcing material is generally selected from glass fiber, mica powder, cellulose, organic synthetic fiber and asbestos fiber. The silicon-calcium board is made up by using silicon material or calcium material as main raw material through the processes of pulping, forming, steam curing, drying, sanding and a series of working procedures.
CN110423086A discloses a high-fireproof performance composite calcium silicate board and a preparation method thereof, wherein the high-fireproof performance composite calcium silicate board comprises the following raw materials in percentage by weight: 23.77% of quartz powder, 5.94% of diatomite, 37.44% of lime, 14.38% of cement, 14.85% of wollastonite, 3.71% of mica, 10.10% of log pulp and 4.16% of perlite; the preparation method comprises the following steps: preparing raw wood pulp, storing slurry, forming blank, making blank, stacking, precuring, demoulding, steaming, drying and processing. The invention has simple process and high fireproof performance; however, the invention has high cost and the obtained calcium silicate board has low strength.
CN105016663A discloses a calcium silicate board containing paper making sludge ash and a preparation method thereof, wherein the calcium silicate board comprises the following raw materials in percentage by weight: 20-40% of cement, 10-31% of papermaking sludge ash, 21-40% of quartz sand, 1-10% of wood pulp, 1-5% of asbestos fiber and 6-15% of sanding waste. The invention uses the papermaking sludge ash to replace part of cement, has good impact resistance and moisture resistance, and reduces the cost; however, the asbestos fiber adopted as the raw material of the invention is a class I carcinogen and is banned from being used in many countries.
Disclosure of Invention
The first purpose of the invention is to provide an environment-friendly radiation-proof composite material, the calcium silicate board prepared from the composite material is non-toxic and harmless, has a radiation-proof effect and is low in raw material price; the preparation method has simple process and safe and environment-friendly preparation process.
The environment-friendly radiation-proof composite material is prepared from the following raw materials: gold mine tailing slag, tourmaline, barite, mineral fiber, cement, desulfurized gypsum and fly ash.
According to the invention, the gold mine tailing slag, the tourmaline, the barite, the mineral fiber, the cement, the desulfurized gypsum and the fly ash are innovatively compounded, so that the problem of stacking the gold mine tailings can be effectively solved, and the antibacterial, deodorizing and radiation-proof functions of the calcium silicate board prepared from the composite material can be effectively increased, thereby playing roles in purifying air and resisting radiation indoors.
In a preferred embodiment of the present invention, the raw materials comprise, in parts by weight: 20-60 parts of gold mine tailing slag, 2-10 parts of tourmaline, 3-12 parts of barite, 3-15 parts of mineral fiber, 18-45 parts of cement, 5-20 parts of desulfurized gypsum and 1-15 parts of fly ash. Further preferably, the raw materials comprise: 30-50 parts of gold mine tailing slag, 2-6 parts of tourmaline, 3-8 parts of barite, 5-10 parts of mineral fiber, 20-40 parts of cement, 10-15 parts of desulfurized gypsum and 5-10 parts of fly ash. Further preferably, 30-35 parts of gold mine tailing slag, 2-3 parts of tourmaline, 3-4 parts of barite, 5-6 parts of mineral fiber, 30-35 parts of cement, 10-12 parts of desulfurized gypsum and 5-6 parts of fly ash.
In the invention, the gold mine tailing slag is preferably small Qinling gold mine tailing, and the mesh number of the gold mine tailing slag is preferably 150-200 meshes. The gold tailings can be ground to the desired mesh size.
In the invention, the mineral fiber is preferably one or more of dolomite, steel slag, coal gangue and basalt, and is further preferably processed by a high-temperature melting fiber-forming process. In the present invention, the average length of the mineral fibers is 0.8 to 3.5mm, and the diameter of the mineral fibers is 3.0 to 8.0 μm.
In the present invention, the cement is preferably 325# cement or 425# Portland cement. The mesh number of the tourmaline and the barite is preferably 200-325 meshes, and in order to further improve the strength of the product and control the components of the product, the grades of the tourmaline, the barite and the desulfurized gypsum are preferably more than or equal to 85%, more than or equal to 90% and more than or equal to 90% respectively.
In a preferred embodiment of the present invention, the raw material consists of gold mine tailings, tourmaline, barite, mineral fiber, cement, desulfurized gypsum and fly ash. Preferably, the environment-friendly radiation-proof composite material is prepared from the following raw materials in parts by weight: 20-60 parts of gold mine tailing slag, 2-10 parts of tourmaline, 3-12 parts of barite, 3-15 parts of mineral fiber, 18-45 parts of cement, 5-20 parts of desulfurized gypsum and 1-15 parts of fly ash.
In the present invention, the total weight part of the raw materials may be 100 parts by weight or more than 100 parts by weight, as long as the value of each raw material is within the above range. In the present invention, the parts by weight may be in the units of μ g, mg, g, kg, etc. known in the art, or may be multiples thereof, such as 1/10, 1/100, 10, 100, etc.
The environment-friendly radiation-proof composite material provided by the invention is preferably prepared into a calcium silicate board, namely an environment-friendly radiation-proof calcium silicate board, and the calcium silicate board can be obtained by uniformly stirring and mixing raw materials, molding and hardening, pre-curing, demolding, autoclaving, drying and edging.
Namely, another object of the present invention is to provide a method for preparing the above composite material, comprising the steps of:
1) grinding the gold mine tailing slag, the tourmaline and the heavy gold stone to obtain powder, uniformly mixing the powder, the mineral fiber, the cement, the desulfurized gypsum and the water, and stirring and standing the mixture to obtain slurry;
2) and (3) forming and hardening the slurry, pre-curing, demolding, carrying out autoclaved curing, drying and edging to obtain the high-strength high-toughness high-strength high-toughness high.
Wherein, the weight parts of the raw materials are added according to the optimal amount, and the amount of the water is preferably 30 to 35 weight percent of the total amount of the solid materials.
In a preferred embodiment of the present invention, in step 1), the stirring speed is preferably 800r/min to 1000 r/min. And preferably stirring for 10-18 min after adding the mineral fibers. And preferably stirring for 18-22 min after adding the cement. And adding desulfurized gypsum and then preferably stirring for 20-25 min. The standing time is preferably 15-30 min. The obtained slurry is more uniform by stirring according to the stirring sequence and the stirring time.
In a preferred embodiment of the present invention, in the step 2), the pre-curing time is preferably 5 to 7 hours. The temperature of the pre-curing is preferably 100 ℃ to 150 ℃. The steam pressure of the steam pressure curing is preferably 0.80-1.0 kPa. The temperature of the autoclave curing is preferably 150 ℃ to 200 ℃. The time of the steam curing is preferably 15 to 20 hours.
The invention also aims to provide the application of the environment-friendly radiation-proof composite material or the preparation method of the composite material in preparing calcium silicate boards.
The invention has the beneficial effects that:
(1) the invention adopts the gold mine tailing slag to mix with the tourmaline and the barite, which is beneficial to keeping the stable components of the slurry, reducing the production cost and protecting the environment; (2) the raw materials of the tourmaline-barite composite material comprise tourmaline and barite, so that tailings can be innoxious, secondary pollution of products can be avoided, and the tourmaline-barite composite material has the effects of antibiosis, deodorization and radiation protection, and is beneficial to the health of workers and users; (3) the invention uses mineral fiber to replace asbestos, so that the product has the performances of flame retardance, sound absorption and high strength, and simultaneously avoids the harm of asbestos; (4) the silicon-calcium plate obtained by the invention has high strength, low thermal conductivity, strong fire resistance, good sound insulation and stable chemical property, and meets the national standard of silicon-calcium plates for buildings; (5) the calcium silicate board obtained by the invention has certain radiation protection performance, the internal irradiation index and the external irradiation index are lower than the national standard, and the calcium silicate board has ray protection capability; (6) the calcium silicate board obtained by the invention is green and environment-friendly, and has no harmful substance dissolution phenomenon in a simulated leaching test; (7) the preparation method is simple, low in cost and good in effect.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are commercially available.
The gold mine tailing slag in the embodiment of the invention is Xiaoqinling gold mine tailing slag, and the composition of the gold mine tailing slag is shown in the following table 1:
TABLE 1 composition of gold tailings from Xiaoqinling mountains
| Mineral substance | Quartz crystal | Plagioclase feldspar | Potassium feldspar | Calcite | Dolomite | Illite stone | Chlorite (chlorite) | Amphibole |
| XA01 northeast corner | 69.7 | 4.1 | 1.5 | 0.9 | 0.8 | 20.0 | 2.0 | 1.0 |
| XA02 | 68.4 | 2.9 | 0.6 | 2.7 | 0.9 | 21.5 | 3.0 | |
| XA03 | 63.9 | 3.5 | 1.0 | 2.7 | 0.8 | 24.5 | 3.0 | 0.6 |
| XA04 | 69.0 | 5.4 | 1.0 | 1.9 | 1.6 | 17.5 | 2.5 | 1.1 |
| XA05 | 67.0 | 2.1 | 0.8 | 1.9 | 1.0 | 24.0 | 2.5 | 0.7 |
| XA06 | 70.4 | 2.8 | 1.2 | 1.8 | 2.3 | 19.5 | 2.0 | |
| XA07 | 71.0 | 3.6 | 0.7 | 1.5 | 2.7 | 18.0 | 2.5 | |
| XA08 | 77.4 | 2.2 | 3.3 | 1.6 | 2.0 | 12.0 | 1.5 |
Example 1
The embodiment provides an environment-friendly radiation-proof calcium silicate board, which comprises the following raw materials: 30 wt% of gold mine tailing slag, 3 wt% of tourmaline, 4 wt% of barite, 5 wt% of mineral fiber, 35 wt% of cement, 12 wt% of desulfurized gypsum and 10 wt% of fly ash.
In this embodiment, the mineral fiber is processed from steel slag by a high-temperature melting fiber-forming process. The mineral fibres had an average length of 2.5mm and a diameter of 3.0. mu.m.
The cement is 425# ordinary portland cement.
The preparation method of the environment-friendly radiation-proof calcium silicate board of the embodiment is as follows:
(1) the tourmaline is subjected to ore dressing and purification treatment until the grade is 85 wt%, and is ground to 200 meshes to obtain tourmaline powder;
(2) the barite is subjected to ore dressing and purification treatment until the grade is 90 wt%, and is ground to 200 meshes to obtain tourmaline powder;
(3) grinding the gold mine tailing slag to 150 meshes to obtain gold mine tailing slag powder; uniformly mixing tourmaline powder, barite powder and tailing slag powder, adding mineral fiber, stirring in a stirrer (800r/min) for 18min, adding cement, stirring for 22min, adding desulfurized gypsum, stirring for 25min, adding water accounting for 30 wt% of the total amount of solid materials, continuously stirring uniformly, and finally standing for 15min to obtain slurry;
(4) pouring the obtained slurry into a mold for molding and hardening, and performing pre-curing at the temperature of 150 ℃ for 7 hours to obtain a hardened product;
(5) performing autoclaved curing, wherein the steam pressure is 0.80KPa, the temperature is 150 ℃, and the curing is performed for 15h, so as to obtain a calcium silicate board blank;
(6) drying and edging to obtain the finished product.
Example 2
The embodiment provides an environment-friendly radiation-proof calcium silicate board, which comprises the following raw materials: 40 wt% of tailing slag, 4 wt% of tourmaline, 6 wt% of barite, 6 wt% of mineral fiber, 27 wt% of cement, 10 wt% of desulfurized gypsum and 7 wt% of fly ash.
In the embodiment, the mineral fibers are formed by processing dolomite, steel slag and basalt through a high-temperature melting fiber forming process according to the mass ratio of 3:2: 5. The mineral fibres had an average length of 3.5mm and a diameter of 6.5 μm.
The cement is 325# cement.
The preparation method of the environment-friendly radiation-proof calcium silicate board of the embodiment is as follows:
(1) the tourmaline is processed by ore dressing and purification to reach the grade of 87.5wt percent and is ground to 280 meshes to obtain tourmaline powder;
(2) the barite is subjected to mineral separation and purification treatment until the grade is 92.5 wt%, and is ground to 280 meshes to obtain tourmaline powder;
(3) grinding the gold mine tailing slag to 180 meshes to obtain gold mine tailing slag powder; uniformly mixing tourmaline powder, barite powder and tailing slag powder, adding mineral fiber, stirring in a stirrer (900r/min) for 15min, adding cement, stirring for 20min, adding desulfurized gypsum, stirring for 22.5min, adding water accounting for 35 wt% of the total amount of solid materials, and standing for 20min to obtain slurry;
(4) pouring the obtained slurry into a mold for molding and hardening, and performing pre-curing at the temperature of 100 ℃ for 7 hours to obtain a hardened product;
(5) performing autoclaved curing, wherein the steam pressure is 0.9KPa, the temperature is 180 ℃, and the curing is carried out for 18h, so as to obtain a calcium silicate board blank;
(6) drying and edging to obtain the finished product.
Example 3
The embodiment provides an environment-friendly radiation-proof calcium silicate board, which comprises the following raw materials: 42 wt% of gold mine tailing slag, 5 wt% of tourmaline, 7 wt% of barite, 8 wt% of mineral fiber, 20 wt% of cement, 13 wt% of desulfurized gypsum and 5 wt% of fly ash.
In the embodiment, the mineral fiber is formed by processing dolomite and coal gangue according to the mass ratio of 7:3 through a high-temperature melting fiber forming process. The mineral fibres had an average length of 1.0mm and a diameter of 7.5 μm.
The cement is 425# ordinary portland cement.
The preparation method of the environment-friendly radiation-proof calcium silicate board comprises the following steps:
(1) the tourmaline is processed by ore dressing and purification to the grade of 90wt percent and is ground to 325 meshes to obtain tourmaline powder;
(2) the barite is subjected to mineral separation and purification treatment until the grade is 94 wt%, and is ground to 325 meshes, so that tourmaline powder is obtained;
(3) grinding gold mine tailing slag to 200 meshes to obtain tailing slag powder; uniformly mixing tourmaline powder, barite powder and tailing slag powder, adding mineral fiber, stirring in a stirrer (1000r/min) for 10min, adding cement, stirring for 18min, adding desulfurized gypsum, stirring for 20min, adding water accounting for 30 wt% of the total amount of solid materials, continuously stirring uniformly, and finally standing for 30min to obtain slurry;
(4) pouring the obtained slurry into a mold for molding and hardening, and performing pre-curing at the temperature of 120 ℃ for 5 hours to obtain a hardened product;
(5) performing autoclaved curing, wherein the steam pressure is 1.0KPa, the temperature is 200 ℃, and the curing is performed for 20h, so as to obtain a calcium silicate board blank;
(6) drying and edging to obtain the finished product.
Example 4
The embodiment provides an environment-friendly radiation-proof calcium silicate board, which comprises the following raw materials: 50 wt% of gold mine tailing slag, 2 wt% of tourmaline, 3 wt% of barite, 5 wt% of mineral fiber, 20 wt% of cement, 10 wt% of desulfurized gypsum and 10 wt% of fly ash.
Other components and preparation method are the same as example 1.
Example 5
The embodiment provides an environment-friendly radiation-proof calcium silicate board, which comprises the following raw materials: 20 wt% of gold mine tailing slag, 10 wt% of tourmaline, 3 wt% of barite, 15 wt% of mineral fiber, 45 wt% of cement, 5 wt% of desulfurized gypsum and 2 wt% of fly ash.
Other components and preparation method are the same as example 1.
Example 6
The embodiment provides an environment-friendly radiation-proof calcium silicate board, which comprises the following raw materials: 60 wt% of gold mine tailing slag, 2 wt% of tourmaline, 11 wt% of barite, 3 wt% of mineral fiber, 18 wt% of cement, 5 wt% of desulfurized gypsum and 1 wt% of fly ash.
Other components and preparation method are the same as example 1.
Comparative example 1
The comparative example provides an environment-friendly radiation-proof calcium silicate board which comprises the following raw materials: 30 wt% of gold mine tailing slag, 3 wt% of tourmaline, 4 wt% of barite, 5 wt% of mineral fiber, 35 wt% of cement, 12 wt% of gypsum and 10 wt% of fly ash.
The preparation method is the same as that of example 1.
Test examples
Each performance index of the calcium silicate boards prepared in examples 1 to 3 was measured, and the results are shown in Table 2.
TABLE 2 detection of various Performance indexes of calcium silicon sheets
And detecting according to the inner (outer) irradiation index GB/T18883-.
TABLE 3 emission of calcium silicate board and exudation of harmful substances
From the above detection results, the calcium silicate boards of embodiments 1 to 6 of the invention meet the requirements of relevant detection standards, have low thermal conductivity, good sound insulation performance, excellent flame retardant performance, no radiation, no harmful substances, and no odor, and are environment-friendly radiation-proof calcium silicate boards.
Subsequently, the calcium silicate boards of examples 1 to 6 were subjected to a simulated leaching test: and (3) putting the prepared calcium silicate board into purified water, soaking for 24 hours, and then testing whether harmful substances such as heavy metals exist in the water. The results show that no harmful substances were detected in the calcium silicate boards of examples 1 to 6 by the simulated leaching test.
Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The environment-friendly radiation-proof composite material is characterized by being prepared from the following raw materials: gold mine tailing slag, tourmaline, barite, mineral fiber, cement, desulfurized gypsum and fly ash.
2. The composite material according to claim 1, wherein the raw materials comprise, in parts by weight: 20-60 parts of gold mine tailing slag, 2-10 parts of tourmaline, 3-12 parts of barite, 3-15 parts of mineral fiber, 18-45 parts of cement, 5-20 parts of desulfurized gypsum and 1-15 parts of fly ash.
3. The composite material according to claim 2, characterized in that the raw materials comprise, in parts by weight: 30-50 parts of gold mine tailing slag, 2-6 parts of tourmaline, 3-8 parts of barite, 5-10 parts of mineral fiber, 20-40 parts of cement, 10-15 parts of desulfurized gypsum and 5-10 parts of fly ash.
4. The composite material according to any one of claims 1 to 3, wherein the mineral fiber is one or more of dolomite, steel slag, coal gangue and basalt processed by a high temperature melt fiber forming process; the average length of the mineral fibers is 0.8-3.5 mm, and the diameter of the mineral fibers is 3.0-8.0 mu m.
5. The composite according to any one of claims 1 to 3,
the gold mine tailing slag is gold mine tailing of Xiaoqinling mountain; the mesh number of the gold mine tailing slag is 150-200 meshes;
and/or the cement is 325# cement or 425# Portland cement;
and/or the mesh number of the tourmaline and the barite is 200-325 meshes, and the grades of the tourmaline, the barite and the desulfurized gypsum are respectively more than or equal to 85%, more than or equal to 90% and more than or equal to 90%.
6. The composite material according to any one of claims 1 to 3, characterized in that the raw material consists of gold mine tailings, tourmaline, barite, mineral fibers, cement, desulfurized gypsum and fly ash.
7. A method for preparing a composite material according to any one of claims 1 to 6, characterized in that it comprises the following steps:
1) grinding the gold mine tailing slag, the tourmaline and the heavy gold stone to obtain powder, uniformly mixing the powder, the mineral fiber, the cement, the desulfurized gypsum and the water, and stirring and standing the mixture to obtain slurry;
2) and (3) forming and hardening the slurry, pre-curing, demolding, carrying out autoclaved curing, drying and edging to obtain the high-strength high-toughness high-strength high-toughness high.
8. The preparation method according to claim 7, wherein in the step 1), the stirring speed is 800r/min to 1000r/min, the mineral fiber is added and then stirred for 10 to 18min, the cement is added and then stirred for 18 to 22min, the desulfurized gypsum is added and then stirred for 20 to 25 min; the standing time is 15-30 min.
9. The preparation method according to claim 7 or 8, characterized in that in the step 2), the pre-curing time is 5-7 h, and the pre-curing temperature is 100-150 ℃; the steam pressure of the autoclaved curing is 0.80-1.0 kPa, the temperature of the autoclaved curing is 150-200 ℃, and the time of the autoclaved curing is 15-20 h.
10. Use of the composite material according to any one of claims 1 to 6 or the method of production according to any one of claims 7 to 9 for producing calcium silicate boards.
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