CN114573257B - Method for preparing magnesium oxychloride blended aluminosilicate cement by utilizing waste incineration fly ash and aluminum ash - Google Patents
Method for preparing magnesium oxychloride blended aluminosilicate cement by utilizing waste incineration fly ash and aluminum ash Download PDFInfo
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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
- C04B7/00—Hydraulic cements
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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
- C04B7/00—Hydraulic cements
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a method for preparing magnesium oxychloride blended silicate cement by utilizing waste incineration fly ash and aluminum ash, which comprises the following steps of (1) mixing high magnesium powder, waste incineration fly ash and coal gangue to obtain magnesium oxychloride blended silicate cement raw material, and grinding to obtain magnesium oxychloride blended silicate cement raw material fine powder; (2) Mixing the aluminum ash and the magnesium oxychloride with the fine powder of the raw material of the portland cement to obtain fine powder of the aluminum ash, the magnesium oxychloride and the raw material of the portland cement; (3) And (3) mixing the aluminum ash, the magnesium oxychloride and the mixed portland cement raw powder to perform low-temperature plasma irradiation treatment to obtain the magnesium oxychloride and mixed aluminosilicate cement. The invention realizes the high-efficiency resource conversion and utilization of the hazardous waste; the prepared magnesium oxychloride blended aluminosilicate cement has high activity, the highest strength can reach 47Mpa, the content of leachable heavy metals does not exceed the limit value specified in GB30760, and the content of dioxin is lower than 50ng-TEQ/kg.
Description
Technical Field
The invention relates to resource recycling of solid wastes, in particular to a method for preparing magnesium oxychloride blended aluminosilicate cement by utilizing waste incineration fly ash and aluminum ash.
Background
The household garbage incineration fly ash is a dusty substance captured from a fluidized bed or a grate furnace auxiliary flue in the incineration power generation process of the household garbage. The particles are fine, and the heavy metal and trace insoluble dioxin toxic substances are contained by about 0.5 to 1.5 percent. Due to the toxicity characteristics, the incineration fly ash of the household garbage is listed in the national hazardous waste record and belongs to a managed hazardous waste. Besides toxic substances, the household garbage incineration fly ash also contains 30-45% of calcium oxide, so that the household garbage incineration fly ash is a potential building material raw material. But the domestic garbage incineration fly ash also enriches about 10 to 25 percent of chloride. The existence of toxic substances and a large amount of chlorine seriously limits the effective resource utilization of the household garbage incineration fly ash.
Aluminum ash is a byproduct generated in the aluminum smelting and processing industry, and is classified in the national hazardous waste record due to obvious reactivity and chemical toxicity. Certain amount of aluminum nitride and aluminum carbide exist in the aluminum ash, and water is easy to generate to explain that inflammable and explosive methane and hydrogen are released in a humid stockpiling environment. Meanwhile, the aluminum ash also contains a small amount of heavy metals and a certain amount of chlorides, which greatly limits the application of the aluminum ash in building materials.
No matter the waste incineration fly ash or the aluminum ash, the harmless disposal and resource utilization technologies aiming at the two dangerous waste substances are not mature at present, and the products which can be efficiently popularized are developed and are few.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention provides a method for preparing magnesium oxychloride blended aluminosilicate cement by utilizing waste incineration fly ash and aluminum ash, which is simple in preparation method, and can be used for preparing a cement material with high activity and high strength while realizing resource utilization of hazardous wastes.
The technical scheme is as follows: the invention relates to a method for preparing magnesium oxychloride blended aluminosilicate cement by utilizing waste incineration fly ash and aluminum ash, which comprises the following steps:
(1) Mixing high magnesium powder, waste incineration fly ash and coal gangue to obtain magnesium oxychloride blended portland cement raw material, and grinding for 3-12 h to obtain magnesium oxychloride blended portland cement raw material fine powder;
(2) Mixing the aluminum ash and the magnesium oxychloride with the fine powder of the raw material of the portland cement, and uniformly stirring to obtain the fine powder of the aluminum ash, the magnesium oxychloride, the mixed raw material of the portland cement;
(3) Blowing the fine powder of the raw material of the silicate cement mixed with the magnesium oxychloride and the magnesium oxychloride into a low-temperature plasma discharge channel for 0.25 to 1.25 hours to obtain the magnesium oxychloride and the aluminosilicate cement mixed with the magnesium oxychloride.
Comprehensively considering the uniaxial compressive strength and the pollutant content of the prepared cement, wherein the mass ratio of the high magnesium powder, the waste incineration fly ash and the coal gangue in the step (1) is 30-60.
In the step (2), the mass ratio of the aluminum ash to the magnesium oxychloride mixed with the fine powder of the portland cement raw material is 4-29, and more preferably 5-25.
The discharge voltage of the low-temperature plasma irradiation in the step (3) is 4-115 kV, and the preferred voltage is 5-105 kV; the atmosphere is air or oxygen, and oxygen is more preferred.
During the grinding process of the magnesium oxychloride doped mixed portland cement raw material, under the mechanochemical action, the high magnesium powder reacts with part of chloride in the waste incineration fly ash to generate a small amount of magnesium chloride. Under the combined action of mechanochemistry and alkali excitation, calcium oxide in the refuse incineration fly ash fully contacts and reacts with aluminosilicate in the coal gangue, so as to induce the aluminosilicate to change from a low-activity crystal state to a high-activity amorphous state. During the low-temperature plasma irradiation, oxygen and water vapor in the air are ionized and dissociated in a discharge channel to generate oxygen radicals and hydroxyl radicals, and microwaves and heat are released. The oxygen free radicals and the hydroxyl free radicals react with aluminum nitride and aluminum carbide in the aluminum ash to generate aluminate, nitrogen and carbon dioxide, so that the activity of the aluminum ash is improved, and the efficient denitrification and decarburization of the aluminum ash are realized. The oxygen free radicals and the hydroxyl free radicals can realize the high-efficiency degradation of dioxin in the waste incineration fly ash through strong oxidation. The microwave, heat and free radicals released in the low-temperature plasma irradiation process can further improve the activity of aluminosilicate in the coal gangue and the activity of calcium-based materials in the waste incineration fly ash, and induce the mineral components in the high-magnesium powder, the coal gangue, the waste incineration fly ash and the aluminum ash to react with each other to generate active substances such as magnesium chloride, dicalcium silicate, tricalcium silicate, monocalcium dialuminate, monocalcium aluminate, tricalcium aluminate, dodecacalcium heptaluminate, tetracalcium aluminoferrite and the like. The heavy metal in the waste incineration fly ash and the aluminum ash and the silicate in the coal gangue generate stable heavy metal silicate minerals, so that the high-efficiency stabilization of the heavy metal in the waste incineration fly ash and the aluminum ash is realized.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages: (1) The waste incineration fly ash and the aluminum ash are treated cooperatively, so that the high-efficiency resource conversion and utilization of the two dangerous wastes, namely the aluminum ash and the waste incineration fly ash, are realized while the denitrification, the decarburization, the dioxin degradation and the heavy metal stabilization in the aluminum ash and the waste incineration fly ash are solved; (2) The prepared magnesium oxychloride blended aluminosilicate cement has high activity, the highest strength can reach 47Mpa, the content of leachable heavy metals does not exceed the limit value specified in GB30760, and the content of dioxin is lower than 50ng-TEQ/kg.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Incineration fly ash of household garbage: the household garbage incineration fly ash is taken from a certain normally-cooked garbage incineration power plant and collected by a bag-type dust collector. CaO content in the refuse incineration fly ash sample of 61.37% and SO content of 3.62% 3 、4.68％SiO 2 、1.64％Al 2 O 3 、6.32％Na 2 O、3.46％K 2 O、15.37％Cl、1.12％MgO、1.17％ZnO、0.76％PbO、0.49％CdO。
Aluminum ash from Guangzhou Jing Hong GmbH containing 10.27% Al, 56.64% Al 2 O 3 、12.32％SiO 2 、8.24％AlN、7.08％MgAl 2 O 4 、0.82％CaF 2 、1.45％Fe 3 O 4 、1.04％Al 4 C 3 2.14% others.
Example 1
The quality of high magnesium powder, waste incineration fly ash and coal gangue is influenced by the performance of the prepared magnesium oxychloride blended aluminosilicate cement
Preparing magnesium oxychloride blended aluminosilicate cement: as shown in fig. 1, the following raw materials of 30; weighing fine powder of the raw material of the portland cement mixed with the aluminum ash, the magnesium oxychloride and the magnesium oxychloride according to the mass ratio of 5; and blowing the fine powder of the raw material of the aluminum ash, the magnesium oxychloride and the mixed portland cement into a low-temperature plasma discharge channel for treating for 0.25 hour to obtain the magnesium oxychloride, the mixed aluminosilicate cement, wherein the low-temperature plasma discharge voltage is 5kV, and the low-temperature plasma action atmosphere is air.
And (3) performance testing: the magnesium oxychloride mixed aluminosilicate cement material is made into the tested mortar, wherein the sand is selected from ISO standard sand specified in Cement mortar Strength test method (ISO method) GB/T17671-1999, and the water is selected from tap water. The preparation of the mortar, the preparation of the test piece, the maintenance of the test piece and the measurement of the compressive strength of the 28d test piece are all carried out according to GB/T17671-1999 Standard "Cement mortar Strength test method (ISO method)".
Leaching test of heavy metal in magnesium oxychloride blended aluminosilicate cement: preparing leachate by mixing magnesium oxychloride with aluminosilicate cement according to the method of solid waste leaching toxicity leaching method horizontal oscillation method (HJ 557), wherein the concentration of heavy metal in the leachate is measured by using inductively coupled plasma mass spectrometer (Thermo Scientific) TM ELEMENT TM ) And (6) detecting.
The detection test of the content of dioxin in the magnesium oxychloride blended aluminosilicate cement comprises the following steps: the detection of the content of dioxin in the magnesium oxychloride blended aluminosilicate cement is carried out according to the technical specification for controlling the pollution of waste incineration fly ash (HJ 1134).
The test results of this example are shown in Table 1.
Table 1 shows the quality ratio of high magnesium powder, waste incineration fly ash and coal gangue to the performance of the prepared magnesium oxychloride blended aluminosilicate cement
As can be seen from Table 1, the total amount of the residues of the magnesium oxychloride blended with the aluminosilicate cement dioxin does not exceed 50ng-TEQ/kg, and both accord with the technical specification for controlling the waste incineration fly ash pollution (HJ 1134-2020). When the mass ratio of the high-magnesium powder, the waste incineration fly ash and the coal gangue is less than 30 (as in table 1, the mass ratio of the high-magnesium powder, the waste incineration fly ash and the coal gangue is = 25; when the mass ratio of the high-magnesium powder, the waste incineration fly ash and the coal gangue is 30-60 (as in table 1, the mass ratio of the high-magnesium powder, the waste incineration fly ash and the coal gangue is = 30. Under the combined action of mechanochemistry and alkali excitation, calcium oxide in the refuse incineration fly ash fully contacts and reacts with aluminosilicate in the coal gangue, so as to induce the aluminosilicate to change from a low-activity crystal state to a high-activity amorphous state. During the low-temperature plasma irradiation, oxygen and water vapor in the air are ionized and dissociated in a discharge channel to generate oxygen radicals and hydroxyl radicals, and microwaves and heat are released. The oxygen free radicals and the hydroxyl free radicals can realize the high-efficiency degradation of dioxin in the waste incineration fly ash through strong oxidation. The microwave, heat and free radicals released in the low-temperature plasma irradiation process can further improve the activity of aluminosilicate in the coal gangue and the activity of calcium-based materials in the waste incineration fly ash, and induce the mineral components in the high-magnesium powder, the high-coal gangue, the waste incineration fly ash and the aluminum ash to react with each other to generate active substances such as magnesium chloride, dicalcium silicate, tricalcium silicate, monocalcium dialuminate, monocalcium aluminate, tricalcium aluminate, dodecacalcium heptaluminate, tetracalcium aluminoferrite and the like. The heavy metal in the waste incineration fly ash and the aluminum ash and the silicate in the coal gangue generate stable heavy metal silicate minerals, so that the high-efficiency stabilization of the heavy metal in the waste incineration fly ash and the aluminum ash is realized. Finally, the leaching amount of the heavy metal zinc in the prepared magnesium oxychloride doped mixed aluminosilicate cement is less than or equal to 4.25mg/L, the leaching concentration of lead is less than or equal to 0.89mg/L, the leaching concentration of cadmium is less than or equal to 0.53mg/L, and the uniaxial compressive strength is greater than or equal to 34.57MPa. When the mass ratio of the high-magnesium powder, the waste incineration fly ash and the coal gangue is more than 60 (as shown in table 1, the mass ratio of the high-magnesium powder, the waste incineration fly ash and the coal gangue is = 65. Therefore, in summary, when the mass ratio of the high magnesium powder, the waste incineration fly ash and the coal gangue is equal to 30-60.
Example 2
The quality ratio of the fine powder of the raw material of the portland cement mixed by the aluminum ash and the magnesium oxychloride has influence on the performance of the prepared magnesium oxychloride mixed aluminosilicate cement
Preparing magnesium oxychloride blended aluminosilicate cement: weighing high-magnesium powder, waste incineration fly ash and coal gangue according to a mass ratio of 60; weighing the following components in parts by mass; blowing the fine powder of the raw material of the mixed silicate cement mixed with the magnesium oxychloride and the magnesium oxychloride into a low-temperature plasma discharge channel for treating for 5.25 hours to obtain the mixed aluminosilicate cement mixed with the magnesium oxychloride, wherein the discharge voltage of the low-temperature plasma is 55kV, and the action atmosphere of the low-temperature plasma is air.
The performance test, the test for leaching heavy metals from the magnesium oxychloride blended aluminosilicate cement, and the test for detecting the dioxin content in the magnesium oxychloride blended aluminosilicate cement are the same as those in example 1. The test results of this example are shown in Table 2.
TABLE 2 Effect of the quality ratio of the raw powder of the portland cement containing aluminum ash and magnesium oxychloride on the performance of the prepared magnesium oxychloride blended aluminosilicate cement
As can be seen from Table 2, the total amount of the residues of the magnesium oxychloride blended with the aluminosilicate cement dioxin does not exceed 50ng-TEQ/kg, and both accord with the technical specification for controlling the waste incineration fly ash pollution (HJ 1134-2020). When the mass ratio of the fine powder of the raw material of the portland cement blended with magnesium oxychloride is less than 5 (as shown in table 2, when the mass ratio of the fine powder of the raw material of the portland cement blended with magnesium oxychloride is =4, 100, 3, 2.5 and a lower ratio not listed in table 2), because the mixing amount of the aluminum ash is less, active substances such as monocalcium dialuminate, monocalcium aluminate, tricalcium aluminate, dodecacalcium heptaluminate and tetracalcium aluminoferrite generated in the low-temperature plasma irradiation process are reduced, the leaching amount of zinc, lead and cadmium in the prepared magnesium oxychloride blended aluminosilicate cement is obviously increased along with the reduction of the mass ratio of the fine powder of the portland cement blended with aluminum ash and magnesium oxychloride, and the uniaxial compressive strength is obviously reduced along with the reduction of the mass ratio of the fine powder of the raw material of the portland cement blended with aluminum ash and magnesium oxychloride; when the mass ratio of the aluminum ash to the magnesium oxychloride blended portland cement raw material fine powder is 5-25 (as shown in table 2, the mass ratio of the aluminum ash to the magnesium oxychloride blended portland cement raw material fine powder is =5, 100, 15, 25). Under the combined action of mechanochemistry and alkali excitation, calcium oxide in the refuse incineration fly ash fully contacts and reacts with aluminosilicate in the coal gangue, so as to induce the aluminosilicate to change from a low-activity crystal state to a high-activity amorphous state. During the low-temperature plasma irradiation, oxygen and water vapor in the air are ionized and dissociated in the discharge channel to generate oxygen radicals and hydroxyl radicals, and microwaves and heat are released. The oxygen free radicals and the hydroxyl free radicals react with aluminum nitride and aluminum carbide in the aluminum ash to generate aluminate, nitrogen and carbon dioxide, so that the activity of the aluminum ash is improved, and the efficient denitrification and decarburization of the aluminum ash are realized. The oxygen free radicals and the hydroxyl free radicals can realize the high-efficiency degradation of dioxin in the waste incineration fly ash through strong oxidation. The microwave, heat and free radicals released in the low-temperature plasma irradiation process can further improve the activity of aluminosilicate in the coal gangue and the activity of calcium-based materials in the waste incineration fly ash, and induce the mineral components in the high-magnesium powder, the high-coal gangue, the waste incineration fly ash and the aluminum ash to react with each other to generate active substances such as magnesium chloride, dicalcium silicate, tricalcium silicate, monocalcium dialuminate, monocalcium aluminate, tricalcium aluminate, dodecacalcium heptaluminate, tetracalcium aluminoferrite and the like. The heavy metals in the waste incineration fly ash and the aluminum ash and the silicate in the coal gangue generate stable heavy metal silicate minerals, so that the high-efficiency stabilization of the heavy metals in the waste incineration fly ash and the aluminum ash is realized. Finally, the leaching amount of the heavy metal zinc in the prepared magnesium oxychloride doped mixed aluminosilicate cement is less than or equal to 3.05mg/L, the leaching concentration of lead is less than or equal to 0.48mg/L, the leaching concentration of cadmium is less than or equal to 0.23mg/L, and the uniaxial compressive strength is greater than or equal to 38.46MPa. When the mass ratio of the fine powder of the raw material of the portland cement formed by blending the aluminum ash and the magnesium oxychloride is more than 25 (as shown in table 2, when the mass ratio of the fine powder of the raw material of the portland cement formed by blending the aluminum ash and the magnesium oxychloride is =27, 29, 100 and 30 and a higher ratio not listed in table 2), the blending amount of the aluminum ash is too large, and the material ratio is unbalanced, so that the generation amount of active substances such as tricalcium aluminate, dodecacalcium heptaluminate, tetracalcium aluminoferrite and the like is reduced in the low-temperature plasma irradiation process, the leaching toxicity of heavy metal in the prepared magnesium oxychloride blended aluminosilicate cement is remarkably increased along with the further increase of the mass ratio of the fine powder of the raw material of the portland cement formed by blending the aluminum ash and the magnesium oxychloride, and the uniaxial compressive strength is remarkably reduced along with the further increase of the mass ratio of the fine powder of the raw material of the portland cement formed by blending the aluminum ash and the magnesium oxychloride. Therefore, in summary, when the mass ratio of the aluminum ash to the fine powder of the magnesium oxychloride blended portland cement raw material is 5-25.
Example 3
Influence of low-temperature plasma discharge voltage on performance of magnesium oxychloride blended aluminosilicate cement
Preparing magnesium oxychloride blended aluminosilicate cement: weighing high-magnesium powder, waste incineration fly ash and coal gangue according to a mass ratio of 60; weighing the aluminum ash and the magnesium oxychloride mixed with the fine powder of the raw portland cement material according to the mass ratio of 25 to 100, mixing and uniformly stirring to obtain the fine powder of the aluminum ash, the magnesium oxychloride mixed with the raw portland cement material; and blowing the fine powder of the mixed silicate cement raw material mixed with the magnesium oxychloride and the magnesium oxychloride into a low-temperature plasma discharge channel for treating for 1.25 hours to obtain the magnesium oxychloride and the mixed aluminosilicate cement, wherein the low-temperature plasma discharge voltage is 3.5kV, 4kV, 4.5kV, 5kV, 55kV, 105kV, 110kV, 115kV and 120kV respectively, and the low-temperature plasma reaction atmosphere is air.
The performance test, the test for leaching heavy metals from the magnesium oxychloride blended aluminosilicate cement, and the test for detecting the dioxin content in the magnesium oxychloride blended aluminosilicate cement are the same as those in example 1. The test results of this example are shown in Table 3.
TABLE 3 Effect of low-temperature plasma discharge voltage on the Properties of the prepared magnesium oxychloride blended aluminosilicate cement
As can be seen from Table 3, the total amount of the residues of the prepared magnesium oxychloride blended with the aluminosilicate cement dioxin does not exceed 50ng-TEQ/kg, and both accord with technical specification for controlling waste incineration fly ash pollution (HJ 1134-2020). When the low-temperature plasma discharge voltage is less than 5kV (as shown in Table 3, when the low-temperature plasma discharge voltage =4.5kV, 4kV and 3.5kV and lower values not listed in Table 3), the low-temperature plasma discharge voltage is lower, and the activation activity of low-temperature plasma irradiation is weaker, so that the leaching amount of zinc, lead and cadmium in the prepared magnesium oxychloride blended aluminosilicate cement is remarkably increased along with the reduction of the low-temperature plasma discharge voltage, and the uniaxial compressive strength is remarkably reduced along with the reduction of the low-temperature plasma discharge voltage; when the low-temperature plasma discharge voltage is equal to 5-105 kV (as shown in Table 3, the low-temperature plasma discharge voltage =5kV, 55kV and 105 kV), under the action of mechanochemistry, the high magnesium powder reacts with part of chloride salt in the waste incineration fly ash in the grinding process of the magnesium oxychloride doped mixed portland cement raw material to generate a small amount of magnesium chloride. Under the combined action of mechanochemistry and alkali excitation, calcium oxide in the refuse incineration fly ash fully contacts and reacts with aluminosilicate in the coal gangue, so as to induce the aluminosilicate to change from a low-activity crystal state to a high-activity amorphous state. During the low-temperature plasma irradiation, oxygen and water vapor in the air are ionized and dissociated in a discharge channel to generate oxygen radicals and hydroxyl radicals, and microwaves and heat are released. The oxygen free radicals and the hydroxyl free radicals react with aluminum nitride and aluminum carbide in the aluminum ash to generate aluminate, nitrogen and carbon dioxide, so that the activity of the aluminum ash is improved, and the efficient denitrification and decarburization of the aluminum ash are realized. The oxygen free radicals and the hydroxyl free radicals can realize the high-efficiency degradation of dioxin in the waste incineration fly ash through strong oxidation. The microwave, heat and free radicals released in the low-temperature plasma irradiation process can further improve the activity of aluminosilicate in the coal gangue and the activity of calcium-based materials in the waste incineration fly ash, and induce the mineral components in the high-magnesium powder, the high-coal gangue, the waste incineration fly ash and the aluminum ash to react with each other to generate active substances such as magnesium chloride, dicalcium silicate, tricalcium silicate, monocalcium dialuminate, monocalcium aluminate, tricalcium aluminate, dodecacalcium heptaluminate, tetracalcium aluminoferrite and the like. The heavy metal in the waste incineration fly ash and the aluminum ash and the silicate in the coal gangue generate stable heavy metal silicate minerals, so that the high-efficiency stabilization of the heavy metal in the waste incineration fly ash and the aluminum ash is realized. Finally, the leaching amount of the heavy metal zinc in the prepared magnesium oxychloride doped mixed aluminosilicate cement is less than or equal to 2.27mg/L, the leaching concentration of lead is less than or equal to 0.27mg/L, the leaching concentration of cadmium is less than or equal to 0.12mg/L, and the uniaxial compressive strength is greater than or equal to 42.39MPa. When the low-temperature plasma discharge voltage is more than 105kV (as shown in Table 3, when the low-temperature plasma discharge voltage is =110kV, 115kV and 120kV and higher values not listed in Table 3), the discharge voltage is too large, the materials are locally over-burnt, and the activity of the product is reduced, so that the leaching toxicity of the heavy metal of the prepared magnesium oxychloride blended aluminosilicate cement is remarkably increased along with the further increase of the low-temperature plasma discharge voltage, and the uniaxial compressive strength is remarkably reduced along with the further increase of the low-temperature plasma discharge voltage. Therefore, in summary, when the low-temperature plasma discharge voltage is equal to 5-105 kV, the performance of the prepared magnesium oxychloride blended aluminosilicate cement is improved.
Example 4
Influence of low-temperature plasma action atmosphere on performance of magnesium oxychloride blended aluminosilicate cement
Preparing magnesium oxychloride blended aluminosilicate cement: weighing high-magnesium powder, waste incineration fly ash and coal gangue according to a mass ratio of 60; weighing fine powder of the raw material of the portland cement mixed with the aluminum ash, the magnesium oxychloride and the magnesium oxychloride according to the mass ratio of 25 to 100, mixing and uniformly stirring to obtain fine powder of the raw material of the portland cement mixed with the aluminum ash, the magnesium oxychloride and the magnesium oxychloride; blowing the fine powder of the raw material of the aluminum ash, the magnesium oxychloride and the mixed portland cement into a low-temperature plasma discharge channel for treating for 1.25 hours to obtain the magnesium oxychloride, the mixed aluminosilicate cement, wherein the discharge voltage of the low-temperature plasma is 105kV, and the action atmospheres of the low-temperature plasma are respectively air and oxygen.
The performance test, the test for leaching heavy metals from the magnesium oxychloride blended aluminosilicate cement, and the test for detecting the dioxin content in the magnesium oxychloride blended aluminosilicate cement are the same as those in example 1. The test results of this example are shown in Table 4.
TABLE 4 influence of low-temperature plasma discharge voltage on the properties of the prepared magnesium oxychloride blended aluminosilicate cement
As can be seen from Table 4, when the low-temperature plasma action atmosphere is oxygen, the leaching concentration of heavy metals and the dioxin content of the prepared magnesium oxychloride blended aluminosilicate cement are lower than those of the cement prepared when the low-temperature plasma action atmosphere is air, and the uniaxial compressive strength is higher.
Claims (5)
1. A method for preparing magnesium oxychloride blended aluminosilicate cement by utilizing waste incineration fly ash and aluminum ash is characterized by comprising the following steps:
(1) Mixing high magnesium powder, waste incineration fly ash and coal gangue to obtain magnesium oxychloride blended portland cement raw material, and grinding to obtain magnesium oxychloride blended portland cement raw material fine powder;
(2) Mixing the aluminum ash and the magnesium oxychloride with the fine powder of the raw material of the portland cement to obtain fine powder of the aluminum ash, the magnesium oxychloride and the raw material of the portland cement;
(3) Mixing aluminum ash, magnesium oxychloride and mixed portland cement raw material fine powder, and performing low-temperature plasma irradiation treatment to obtain magnesium oxychloride and mixed aluminosilicate cement;
the mass ratio of the high magnesium powder to the waste incineration fly ash to the coal gangue in the step (1) is 30 to 60;
in the step (2), the mass ratio of the aluminum ash to the magnesium oxychloride mixed with the fine powder of the portland cement raw material is 5 to 25;
and (3) discharging voltage of the low-temperature plasma irradiation in the step (3) is 5 to 105kV.
2. The method according to claim 1, wherein the atmosphere in which the low-temperature plasma irradiation is performed in step (3) is air or oxygen.
3. The method according to claim 2, wherein the atmosphere in which the low-temperature plasma irradiation is performed in step (3) is oxygen.
4. The method as claimed in claim 1, wherein the grinding time of the magnesium oxychloride blended portland cement raw material in the step (1) is 3 to 12h.
5. The method according to claim 1, wherein the action time of the low-temperature plasma irradiation in the step (3) is 0.25 to 1.25h.
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