CN113912311B - Heat-insulating sand and preparation method thereof - Google Patents

Heat-insulating sand and preparation method thereof Download PDF

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CN113912311B
CN113912311B CN202111214451.1A CN202111214451A CN113912311B CN 113912311 B CN113912311 B CN 113912311B CN 202111214451 A CN202111214451 A CN 202111214451A CN 113912311 B CN113912311 B CN 113912311B
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heat
sand
blank
reducing agent
powder
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CN113912311A (en
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曹俊涛
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Xinyang Normal University
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Xinyang Normal University
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/027—Lightweight materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • C04B20/06—Expanding clay, perlite, vermiculite or like granular materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1018—Coating or impregnating with organic materials
    • C04B20/1029—Macromolecular compounds
    • C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142—Sulfates
    • C04B22/147—Alkali-metal sulfates; Ammonium sulfate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses heat preservation sand which comprises the following components in percentage by mass: 45-65% of perlite tailing powder, 3-5% of dolomite, 20-30% of cement, 10-20% of blast furnace granulated slag micro powder, 0.1-0.5% of mirabilite, 0.1-0.5% of water reducing agent and the balance of water, and the invention also discloses a preparation method of the heat-insulating sand, which comprises the following steps: (1) mixing perlite tailing powder and dolomite, grinding, roasting, cooling and grinding to obtain mixed powder; (2) mixing mirabilite, a water reducing agent and water to obtain a mixed solution; (3) mixing the mixed powder with the mixed solution, adding cement and the blast furnace granulated slag micro powder, prewetting and stirring to obtain a mixed material; (4) balling the mixture to obtain a ball blank; (5) rounding the spherical blank, and spraying polyvinyl acetate to obtain a heat-preservation sand blank; (6) maintaining the heat preservation sand blank to obtain a maintained heat preservation sand blank; (7) and drying the heat preservation sand blank after maintenance to obtain the heat preservation sand. The heat-insulating sand has good heat-insulating property and compressive strength.

Description

Heat-insulating sand and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to heat-insulating sand and a preparation method thereof.
Background
With the continuous development of society, the increase of township and town living, the proportion of building energy consumption in total energy consumption is larger and larger, so that the energy saving of the building has very important significance, at present, the heat insulation system mainly adopted by the existing building is an external wall heat insulation system, the traditional external wall heat insulation system carries out layered treatment through multiple layers to improve the heat insulation performance of the wall, the traditional external wall heat insulation system can meet the heat insulation requirement of the wall, but most of cold and hot bridges of beams and columns in the wall are metal materials with high heat conductivity, because the heat conductivity coefficient of the metal materials is high, a layer of heat insulation mortar needs to be coated around the cold and hot bridges to reduce the heat conductivity of the cold and hot bridges, at present, the existing heat insulation mortar mostly takes inorganic materials such as vitrified micro-beads, expanded perlite, expanded vermiculite and the like as fillers, and because the pores exist in the porous materials, the thermal insulation mortar has good thermal insulation performance, but the formed coating has poor mechanical property and is difficult to coat on a cold and hot bridge needing bearing.
Disclosure of Invention
In view of the above, the present invention provides a heat preservation sand and a preparation method thereof to solve the above problems.
In order to realize the purpose, the technical scheme of the invention is as follows:
the heat preservation sand comprises the following components in percentage by mass: 45-65% of perlite tailing powder, 3-5% of dolomite, 20-30% of cement, 10-20% of blast furnace granulated slag micro powder, 0.1-0.5% of mirabilite and 0.1-0.5% of a water reducing agent.
Furthermore, the mesh number of the perlite tailing powder is 60-80 meshes.
Furthermore, the mesh number of the dolomite is 80-120 meshes.
Further, the cement is at least one of ordinary portland cement and white cement.
Further, the mesh number of the blast furnace granulated slag micro powder is 270-325 meshes.
Further, the water reducing agent is at least one of a lignosulfonate water reducing agent, a naphthalenesulfonate water reducing agent, a sulfamate water reducing agent and a fatty acid water reducing agent.
Further, the preparation method of the heat-preservation sand comprises the following steps:
(1) mixing perlite tailing powder and dolomite, grinding the mixture into 180-200 meshes, placing the mixture into a roasting furnace, roasting the mixture for 2-4 hours at the temperature of 1080-1150 ℃, cooling the mixture to room temperature, and placing the cooled mixture into a Raymond mill, and grinding the cooled mixture into 180-200 meshes to obtain mixed powder;
(2) taking a certain amount of water, adding mirabilite and a water reducing agent into the water for mixing, and uniformly stirring to obtain a mixed solution;
(3) mixing the mixed powder in the step (1) with the mixed liquid in the step (2), adding cement and blast furnace granulated slag micro powder, and pre-wetting and stirring by adopting a double-shaft stirrer to obtain a mixed material;
(4) conveying the mixture obtained in the step (3) to a disc type ball forming mill for ball forming, and screening the formed ball blank through a rotary screen to obtain a ball blank with the particle size of less than or equal to 5 mm;
(5) putting the ball blank obtained in the step (4) into a shot blasting machine for polishing, and simultaneously spraying polyvinyl acetate to the surface of the ball blank after polishing in an atomizing manner to obtain a heat-preservation sand blank;
(6) placing the heat preservation sand blank in the step (5) in a roller kiln, and performing normal-pressure maintenance for 30-36 hours at the temperature of 55-65 ℃ to obtain a maintained heat preservation sand blank;
(7) and (4) placing the heat preservation sand blank cured in the step (6) in a hot air furnace, introducing hot air for drying, cooling to room temperature, and packaging to obtain the heat preservation sand.
Further, the mass ratio of the mirabilite, the water reducing agent and the water in the step (2) is 1: 1: 150 to 200 parts.
Further, the mass ratio of the polyvinyl acetate and the spherical embryo in the step (5) is 1: 15-20.
Further, the moisture in the heat preservation sand in the step (7) is less than 10%.
The heat preservation sand and the preparation method thereof have the beneficial effects that:
the invention takes perlite tailing powder as a base material, and is added with mirabilite, dolomite and blast furnace granulated slag micro powder to prepare the heat preservation sand, perlite tailing powder can form perlite ceramsite and ceramic sand with good heat preservation performance after being sintered, the perlite tailing powder can ensure that the prepared heat-insulating sand has lower heat conductivity coefficient and good heat-insulating property, the mirabilite is sodium sulfate decahydrate, is an inorganic hydrated salt material, when mirabilite absorbs or releases heat, the physical state changes to generate phase change, thereby storing or releasing the heat, because the mirabilite has higher heat storage density and higher unit energy storage, the energy storage process is approximately constant temperature, the volume is basically unchanged before and after the phase change, so that the heat conductivity coefficient of the heat-insulating sand can be effectively reduced by adding the mirabilite, the heat-insulating property of the heat-insulating sand is improved, and the effective utilization rate of energy is further improved; the dolomite is a carbonate mineral which is used as an alkaline refractory material and is alkaline, the dolomite is mixed with the cement and the blast furnace granulated slag micro powder, and the blast furnace granulated slag micro powder can show higher hydraulicity under the alkaline excitation effect of the dolomite to generate the strength similar to that of the cement, so that the compressive strength of the cement mortar of the heat-preservation sand can be effectively improved by adding the dolomite to excite the hydraulic property of the blast furnace granulated slag micro powder.
Drawings
FIG. 1 is a process flow diagram of the heat-insulating sand preparation method of the present invention.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and specific examples, and the scope of the invention is not limited thereto.
The invention provides heat-insulating sand which is used for being added into building materials to improve the heat-insulating property of buildings, and the formula of the heat-insulating sand comprises the following components in percentage by mass: 45-65% of 60-80 mesh perlite tailing powder, 3-5% of 80-120 mesh dolomite, 20-30% of cement, 10-20% of 270-325 mesh blast furnace granulated slag micro powder, 0.1-0.5% of mirabilite and 0.1-0.5% of water reducing agent; wherein the cement is at least one of ordinary portland cement and white cement; the water reducing agent is at least one of a lignosulfonate water reducing agent, a naphthalenesulfonate water reducing agent, a sulfamate water reducing agent and a fatty acid water reducing agent.
The invention also provides a preparation method of the heat-preservation sand, which comprises the following steps:
(1) mixing perlite tailing powder and dolomite, grinding the mixture into 180-200 meshes, placing the mixture into a roasting furnace, roasting the mixture for 2-4 hours at the temperature of 1080-1150 ℃, cooling the mixture to room temperature, and placing the cooled mixture into a Raymond mill, and grinding the cooled mixture into 180-200 meshes to obtain mixed powder;
(2) taking a certain amount of water, wherein the mass ratio of the mirabilite to the water reducing agent to the water is 1: 1: 150-200, adding mirabilite and a water reducing agent into water, mixing, and uniformly stirring to obtain a mixed solution;
(3) mixing the mixed powder in the step (1) with the mixed liquid in the step (2), adding cement and blast furnace granulated slag micro powder, and pre-wetting and stirring by adopting a double-shaft stirrer to obtain a mixture;
(4) conveying the mixture obtained in the step (3) to a disc type ball forming mill for ball forming, and screening the formed ball blank through a rotary screen to obtain a ball blank with the particle size of less than or equal to 5 mm;
(5) putting the ball blank obtained in the step (4) into a shot blasting machine for polishing, and simultaneously spraying polyvinyl acetate to the surface of the ball blank after polishing in an atomizing manner, wherein the mass ratio of the polyvinyl acetate to the ball blank is 1: 15-20, so as to obtain a heat-preservation sand blank;
(6) placing the heat preservation sand blank in the step (5) in a roller kiln, and performing normal-pressure maintenance for 30-36 hours at the temperature of 55-65 ℃ to obtain a maintained heat preservation sand blank;
(7) and (4) placing the heat preservation sand blank cured in the step (6) into a hot air furnace, introducing hot air for drying, cooling to room temperature, and packaging to obtain the heat preservation sand with the moisture content of less than 10%.
Example 1
The formula of the heat-insulating sand comprises the following components in percentage by mass: 61.8 percent of 60-mesh perlite tailing powder, 3 percent of 80-mesh dolomite, 20 percent of ordinary portland cement, 15 percent of 270-mesh blast furnace granulated slag micro powder, 0.1 percent of mirabilite, 0.1 percent of lignosulfonate water reducing agent and the balance of water.
The preparation method of the heat-preservation sand comprises the following steps:
(1) mixing perlite tailing powder and dolomite, grinding to 180 meshes, placing in a roasting furnace, roasting at 1080 ℃ for 2h, cooling to room temperature, and placing in a Raymond mill, and grinding to 180 meshes to obtain mixed powder;
(2) taking a certain amount of water, wherein the mass ratio of the mirabilite to the lignosulfonate water reducing agent to the water is 1: 1: 150, adding mirabilite and a lignosulfonate water reducing agent into water for mixing, and uniformly stirring to obtain a mixed solution;
(3) mixing the mixed powder in the step (1) with the mixed liquid in the step (2), adding ordinary portland cement and blast furnace granulated slag micro powder, and pre-wetting and stirring by adopting a double-shaft stirrer to obtain a mixed material;
(4) conveying the mixture obtained in the step (3) to a disc type ball forming mill for ball forming, and screening the formed ball blank through a rotary screen to obtain a ball blank with the particle size of less than or equal to 5 mm;
(5) putting the ball blank obtained in the step (4) into a shot blasting machine for polishing, and simultaneously spraying polyvinyl acetate to the surface of the ball blank after polishing in an atomizing manner, wherein the mass ratio of the polyvinyl acetate to the ball blank is 1: 15, so as to obtain a heat-preservation sand blank;
(6) placing the heat preservation sand blank in the step (5) in a roller kiln, and performing normal-pressure maintenance for 30-36 hours at the temperature of 55 ℃ to obtain a maintained heat preservation sand blank;
(7) and (4) placing the heat preservation sand blank cured in the step (6) into a hot air furnace, introducing hot air for drying, cooling to room temperature, and packaging to obtain the heat preservation sand with the moisture content of less than 10%.
Example 2
The formula of the heat-insulating sand comprises the following components in percentage by mass: 53.4 percent of perlite tailing powder with 70 meshes, 4 percent of dolomite with 100 meshes, 25 percent of white cement, 17 percent of blast furnace granulated slag micro powder with 270 to 325 meshes, 0.3 percent of mirabilite and 0.3 percent of naphthalenesulfonate water reducer.
The preparation method of the heat-preservation sand comprises the following steps:
(1) mixing perlite tailing powder and dolomite, grinding to 200 meshes, placing in a roasting furnace, roasting at 1100 ℃ for 3h, cooling to room temperature, and placing in a Raymond mill, and grinding to 180 meshes to obtain mixed powder;
(2) taking a certain amount of water, wherein the mass ratio of the mirabilite to the naphthalenesulfonate water reducer to the water is 1: 1: 180, adding mirabilite and a naphthalenesulfonate water reducer into water, mixing, and uniformly stirring to obtain a mixed solution;
(3) mixing the mixed powder in the step (1) with the mixed liquid in the step (2), adding white cement and blast furnace granulated slag micro powder, and pre-wetting and stirring by adopting a double-shaft stirrer to obtain a mixed material;
(4) conveying the mixture obtained in the step (3) to a disc type ball forming mill for ball forming, and screening the formed ball blank through a rotary screen to obtain a ball blank with the particle size of less than or equal to 5 mm;
(5) putting the ball blank obtained in the step (4) into a shot blasting machine for polishing, and simultaneously spraying polyvinyl acetate to the surface of the ball blank after polishing in an atomizing manner, wherein the mass ratio of the polyvinyl acetate to the ball blank is 1: 17, so as to obtain a heat-preservation sand blank;
(6) placing the heat preservation sand blank obtained in the step (5) in a roller kiln, and performing normal-pressure maintenance for 30-36 hours at the temperature of 60 ℃ to obtain a maintained heat preservation sand blank;
(7) and (5) placing the heat preservation sand blank obtained after maintenance in the step (6) in a hot air furnace, introducing hot air for drying, cooling to room temperature, and packaging to obtain the heat preservation sand with the moisture content of less than 10%.
Example 3
The formula of the heat-insulating sand comprises the following components in percentage by mass: 50% of 80-mesh perlite tailing powder, 5% of 120-mesh dolomite, 12% of ordinary portland cement, 12% of white cement, 20% of 325-mesh blast furnace granulated slag micro powder, 0.5% of mirabilite and 0.5% of sulfamate water reducing agent.
The preparation method of the heat-preservation sand comprises the following steps:
(1) mixing perlite tailing powder and dolomite, grinding to 200 meshes, placing in a roasting furnace, roasting at 1150 ℃ for 4h, cooling to room temperature, and placing in a Raymond mill, and grinding to 200 meshes to obtain mixed powder;
(2) taking a certain amount of water, wherein the mass ratio of the mirabilite to the water reducing agent to the water is 1: 1: 200, adding mirabilite and a water reducing agent into water for mixing, and uniformly stirring to obtain a mixed solution;
(3) mixing the mixed powder in the step (1) with the mixed liquid in the step (2), adding cement and blast furnace granulated slag micro powder, and pre-wetting and stirring by adopting a double-shaft stirrer to obtain a mixed material;
(4) conveying the mixture obtained in the step (3) to a disc type ball forming mill for ball forming, and screening the formed ball blank through a rotary screen to obtain a ball blank with the particle size of less than or equal to 5 mm;
(5) placing the ball blank obtained in the step (4) into a shot blasting machine for throwing a circle, and simultaneously spraying polyvinyl acetate to the surface of the ball blank subjected to the circle throwing in an atomizing manner, wherein the mass ratio of the polyvinyl acetate to the ball blank is 1: 20, so as to obtain a heat-preservation sand blank;
(6) placing the heat preservation sand blank in the step (5) in a roller kiln, and performing normal-pressure maintenance for 30-36 hours at the temperature of 65 ℃ to obtain a maintained heat preservation sand blank;
(7) and (4) placing the heat preservation sand blank cured in the step (6) into a hot air furnace, introducing hot air for drying, cooling to room temperature, and packaging to obtain the heat preservation sand with the moisture content of less than 10%.
Comparative example 1
The heat-insulating sand of this comparative example was substantially the same as the heat-insulating sand of example 1, except that no mirabilite was added to the heat-insulating sand of this comparative example.
Comparative example 2
The heat-insulating sand of this comparative example was substantially the same as the heat-insulating sand of example 1, except that dolomite was not added to the heat-insulating sand of this comparative example.
Examples of the experiments
The heat-insulating sand prepared in the examples 1 to 3 and the heat-insulating sand prepared in the comparative examples 1 and 2 are detected, the heat conductivity coefficient of the heat-insulating sand prepared in the examples 1 to 3 and the heat-insulating sand prepared in the comparative examples 1 and 2 is measured by a heat conductivity coefficient measuring instrument, and the compressive strength of the cement mortar of the heat-insulating sand prepared in the examples 1 to 3 and the heat-insulating sand prepared in the comparative examples 1 and 2 is measured according to GBT 17671-1999 Cement mortar Strength test method, wherein the specific detection structure is shown in Table 1:
table 1: performance data sheet for Heat-insulating Sand of examples 1-3 and comparative examples 1 and 2
Performance of Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2
Thermal conductivity/W/(m.k) 0.07 0.06 0.08 0.16 0.12
Compressive strength/MPa of cement mortar 13.7 14.2 13.9 12.8 10.4
As can be seen from table 1, the heat conductivity coefficients of the heat-insulating sands prepared in examples 1 to 3 are all less than 0.1W/(m.k), and the heat-insulating sand prepared in comparative example 1 has no mirabilite added, so that the heat conductivity coefficient is greater than 0.1W/(m.k), because the mirabilite is sodium sulfate decahydrate and is an inorganic hydrated salt material, when the mirabilite absorbs or releases heat, the change of physical state occurs to generate phase change, so that the heat is stored or released, and because the mirabilite has high heat storage density and high unit energy storage, the energy storage process is approximately constant in temperature, and the volume before and after the phase change is basically unchanged, the heat conductivity coefficient of the heat-insulating sand can be effectively reduced by adding the mirabilite into the heat-insulating sands prepared in examples 1 to 3, the heat-insulating performance of the heat-insulating sands is improved, and the effective utilization rate of energy is further improved; meanwhile, as can be seen from table 1, the compressive strength of the mortar of the insulation sands prepared in examples 1 to 3 is greater than 13MPa, while the compressive strength of the mortar of the insulation sands prepared in comparative example 2 is about 10MPa due to the absence of the addition of dolomite, because the dolomite is a carbonate mineral which is alkaline as an alkaline refractory material, the dolomite is mixed with the cement and the blast furnace granulated slag micro powder, and the blast furnace granulated slag micro powder can exhibit higher hydraulic property under the alkaline excitation action of the dolomite to generate a strength close to that of the cement, so that the compressive strength of the mortar of the insulation sands prepared in examples 1 to 3 can be effectively improved by exciting the hydraulic property of the blast furnace granulated slag micro powder by adding the dolomite.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims (9)

1. The heat preservation sand is characterized by comprising the following components in percentage by mass: 45-65% of perlite tailing powder, 3-5% of dolomite, 20-30% of cement, 10-20% of blast furnace granulated slag micro powder, 0.1-0.5% of mirabilite and 0.1-0.5% of a water reducing agent; the preparation method of the heat-preservation sand comprises the following steps:
(1) mixing perlite tailing powder and dolomite, grinding the mixture into 180-200 meshes, placing the mixture into a roasting furnace, roasting the mixture for 2-4 hours at the temperature of 1080-1150 ℃, cooling the mixture to room temperature, and placing the cooled mixture into a Raymond mill, and grinding the cooled mixture into 180-200 meshes to obtain mixed powder;
(2) taking a certain amount of water, adding mirabilite and a water reducing agent into the water for mixing, and uniformly stirring to obtain a mixed solution;
(3) mixing the mixed powder in the step (1) with the mixed liquid in the step (2), adding cement and blast furnace granulated slag micro powder, and pre-wetting and stirring by adopting a double-shaft stirrer to obtain a mixture;
(4) conveying the mixture obtained in the step (3) to a disc type ball forming mill for ball forming, and screening the formed ball blanks through a rotary screen to obtain ball blanks with the particle size of less than or equal to 5 mm;
(5) putting the ball blank obtained in the step (4) into a shot blasting machine for polishing, and simultaneously spraying polyvinyl acetate to the surface of the ball blank after polishing in an atomizing manner to obtain a heat-preservation sand blank;
(6) placing the heat preservation sand blank in the step (5) in a roller kiln, and performing normal-pressure maintenance for 30-36 hours at the temperature of 55-65 ℃ to obtain a maintained heat preservation sand blank;
(7) and (4) placing the heat preservation sand blank cured in the step (6) in a hot air furnace, introducing hot air for drying, cooling to room temperature, and packaging to obtain the heat preservation sand.
2. The heat-preservation sand according to claim 1, wherein the mesh number of the perlite tailing powder is 60-80 meshes.
3. The insulating sand according to claim 1, wherein the mesh number of the dolomite is 80 to 120 mesh.
4. The insulating sand of claim 1, wherein the cement is at least one of ordinary portland cement and white cement.
5. The insulating sand according to claim 1, wherein the mesh number of the granulated blast furnace slag micro powder is 270 to 325 mesh.
6. The heat-insulating sand according to claim 1, wherein the water reducing agent is at least one of a lignosulfonate water reducing agent, a naphthalenesulfonate water reducing agent, a sulfamate water reducing agent and a fatty acid water reducing agent.
7. The heat-preservation sand according to claim 1, wherein the mass ratio of the mirabilite, the water reducing agent and the water in the step (2) is 1: 1: 150 to 200 parts.
8. The heat-preservation sand according to claim 1, wherein the mass ratio of the polyvinyl acetate to the spherical embryo in the step (5) is 1: 15-20.
9. The insulating sand of claim 1, wherein the moisture in the insulating sand of step (7) is less than 10%.
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CN107721358A (en) * 2017-10-23 2018-02-23 上海大学 Slag micropowder mixes perlite tailing baking-free ceramicite and preparation method thereof
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