CN112390559B - Method for preparing sandstone aggregate by utilizing manganese-silicon alloy hot-melt slag and application - Google Patents
Method for preparing sandstone aggregate by utilizing manganese-silicon alloy hot-melt slag and application Download PDFInfo
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- CN112390559B CN112390559B CN202011414058.2A CN202011414058A CN112390559B CN 112390559 B CN112390559 B CN 112390559B CN 202011414058 A CN202011414058 A CN 202011414058A CN 112390559 B CN112390559 B CN 112390559B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/144—Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome slags
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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- 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
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Abstract
The invention relates to a method for preparing sandstone aggregate by utilizing manganese-silicon alloy hot-melt slag, which adopts a heat-insulating mould body with an opening at the top and a trapezoidal groove structure as a whole and a heat-insulating cover capable of covering the opening as a mould; pouring liquid manganese-silicon alloy hot slag generated in the production of manganese-silicon alloy into the mold body; covering the opening of the mold body with the heat-insulating cover, standing for 12-36h, and demolding to obtain a pouring block; crushing the prepared pouring block in three stages to obtain crushed materials; screening the crushed material to remove particles and powder with particle sizes not meeting the requirement, and finally preparing coarse aggregate or fine aggregate; putting the coarse aggregate or the fine aggregate into a sand making machine to prepare sandstone aggregate suitable for concrete or mortar; the method for preparing the sandstone aggregate effectively reduces the brittleness of the manganese-silicon alloy slag, improves the surface roughness of the sandstone aggregate, keeps good adhesion of concrete or mortar, and effectively realizes secondary utilization of the manganese-silicon alloy slag.
Description
Technical Field
The invention belongs to the technical field of manganese-silicon slag treatment, and particularly relates to a method for preparing sandstone aggregate by using manganese-silicon alloy hot-melt slag and application thereof.
Background
The manganese-silicon alloy is a common compound deoxidizer for steel making, almost all steel grades need to be deoxidized by manganese, the yield of pig iron and crude steel in China is increasing since 2018, and the demand for the manganese-silicon alloy is high. The manganese-silicon alloy slag is blast furnace slag formed by water quenching high-temperature slag discharged in the manganese-silicon alloy smelting process, 1.2-1.3 tons of manganese-silicon alloy slag are generated every 1 ton of manganese-silicon alloy, and a large amount of solid waste becomes a large household with great environmental pollution. The method is implemented in 2018, 1/1, namely "tax for environmental protection of the people's republic of China", increases tax collection force on stockpiled industrial solid wastes, and pays 25 yuan/ton of tax for environmental protection on metallurgical slag storage, disposal and resource utilization which do not meet the regulations, so that new burden is brought to enterprises. And simultaneously, a No. 44 file of national institute of improvement in 2019 lists the treatment of the manganese-silicon alloy slag as an object of solid waste key treatment.
At present, the conventional treatment of manganese-silicon alloy slag is to carry out water quenching treatment on the manganese-silicon alloy slag, then add the manganese-silicon alloy slag into concrete or mortar according to engineering requirements after smelting, pouring, cooling, solidifying and crushing with other additives; such an approach has the following problems: 1. a large amount of water resources are consumed in the water quenching treatment process of the manganese-silicon alloy slag, so that a large amount of water resources are wasted; 2. the discharge temperature of the hot-melting manganese-silicon alloy slag is about 1500 ℃, the heat content of each ton of hot-melting manganese-silicon alloy slag is about 1.8GJ, the heat is consumed in the water quenching process, and the hot-melting manganese-silicon alloy slag needs to be heated again when being hot-melted again, so that the loss of hot energy and the excessive consumption of resources are caused; 3. the manganese-silicon alloy slag after water quenching treatment is of a light porous structure, and the manganese-silicon alloy slag of the porous structure is subjected to crushing treatment and then is applied to a limited range and can only be applied to parts of places needing light aggregate.
The manganese-silicon alloy slag is directly and naturally cooled and solidified to form a glass body as shown in figure 2, the glass body has larger brittleness and smooth surface, is not easy to be grouted in the stirring process when being added into concrete as concrete aggregate, has poor adhesion with cement and fine aggregate in the concrete, and has unsatisfactory workability; in addition, the glass body is more in needle sheet shape generated in the crushing process, high in pulverization rate and difficult to separate from qualified products.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the method for preparing the sandstone aggregate by utilizing the manganese-silicon alloy hot-melt slag, which can effectively reduce the brittleness of the solidified manganese-silicon alloy hot-melt slag by adopting a heat-preservation slow cooling mode for solidification, and can realize resource utilization, energy conservation, environmental protection and economic cost saving of the manganese-silicon alloy hot-melt slag by applying the prepared sandstone aggregate to concrete or mortar.
The technical scheme of the invention is as follows:
a method for preparing sandstone aggregate by utilizing manganese-silicon alloy hot-melt slag comprises the following preparation processes:
s1, manufacturing a die, namely manufacturing a heat-preservation die body with an opening at the top and a trapezoidal groove structure as a whole and a heat-preservation cover capable of covering the opening, wherein the area of the opening is larger than that of the bottom of the die body;
s2, pouring, namely paving a layer of solid manganese-silicon alloy slag at the bottom of the mold body, and pouring liquid manganese-silicon alloy hot slag generated in manganese-silicon alloy production into the mold body;
s3, cooling, covering the opening of the mold body with the heat-preservation cover after the step S2 is completed, standing for 12-36h, and demolding to obtain a pouring block;
s4, crushing, namely, carrying out three-stage crushing on the pouring block prepared in the step S3 to obtain crushed materials;
s5, screening, namely screening the crushed material obtained in the step S4 to remove particles and powder with unsatisfactory particle size, and finally preparing coarse aggregate or fine aggregate;
s6, sand making, namely putting the coarse aggregate or the fine aggregate prepared in the step S5 into a sand making machine to prepare sand aggregate suitable for concrete or mortar.
Further, the mould body includes inlayer and skin, it has first heat preservation to fill between inlayer and the skin, the heat preservation lid includes hollow casing, the casing intussuseption is filled with the second heat preservation.
Further, the inner layer is made of cast iron, and the outer layer and the shell are made of steel plates.
Further, the inner layer is welded with the outer layer.
Further, the first heat-insulating layer and the second heat-insulating layer are made of any one of mineral wool, ceramic fiber or glass wool.
Further, the outer surface of the inner layer is coated with a yellow mud layer or a refractory soil layer.
Further, the three-stage crushing in the step S4 is performed by using a jaw crusher as the first-stage crushing, a cone crusher as the second-stage crushing, and an impact crusher as the third-stage crushing in sequence.
Further, the coarse aggregate has a particle size grade of 5-25mm, and the fine aggregate has a particle size grade of 0.15-5 mm.
The application of the sandstone aggregate prepared by the method and the coarse aggregate or the fine aggregate in the preparation of concrete or mortar for civil engineering or constructional engineering.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, after liquid manganese-silicon alloy hot-melt slag generated in manganese-silicon alloy production is poured into a die body with a heat-insulating layer, a heat-insulating cover with the same heat-insulating layer is covered, and the die body is kept stand for 12-36h for slow cooling in a heat-insulating state, compared with the direct natural cooling, the brittleness of solidified manganese-silicon alloy slag is effectively reduced, the surface of crushed gravel aggregate has good roughness, the crushed gravel aggregate has good adhesion when being mixed into concrete or mortar, the content of needle-shaped crushed aggregates in the crushing process is effectively reduced, and the pulverization rate is effectively reduced;
2. the mould body adopts a trapezoidal groove body structure with an opening at the top, so that a solidified pouring block can be conveniently separated from the mould body; before pouring, a layer of solid manganese-silicon alloy slag is paved at the bottom of the mold body, so that the adhesion of liquid manganese-silicon alloy hot slag and the mold body is effectively avoided;
3. according to the invention, the pouring block is subjected to three-stage crushing, so that the pouring block is effectively and fully crushed to improve the particle uniformity of the crushed material, and particles and powder with particle sizes not meeting the requirements are removed by screening to improve the aggregate performance of the obtained coarse aggregate or fine aggregate after being applied to concrete or mortar;
4. according to the invention, water quenching treatment on the manganese-silicon alloy hot-melting slag is not required, the mold body with the heat preservation function is directly utilized for slow cooling, waste of water resources is effectively saved, secondary utilization of the manganese-silicon alloy hot-melting slag is realized, the comprehensive utilization rate of the manganese-silicon alloy hot-melting slag is effectively improved, the problem of difficulty in piling up industrial solid wastes is further solved, mountain excavation and gravel mining are reduced to a certain extent, and the ecological environment is effectively protected.
Drawings
FIG. 1 is a schematic structural view of a mold body and a heat-insulating cover according to the present invention;
FIG. 2 is a crystal diagram of manganese-silicon alloy hot-melt slag after natural cooling;
FIG. 3 is a crystal diagram of manganese-silicon alloy hot-melt slag after being slowly cooled in a mold body with a heat preservation function;
the mold comprises a mold body 1, a mold body 101, an inner layer 102, an outer layer 103, a first heat preservation layer 2, a heat preservation cover 201, a shell 202 and a second heat preservation layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for preparing sandstone aggregate by utilizing manganese-silicon alloy hot-melt slag comprises the following preparation processes:
s1, manufacturing a die, namely manufacturing a heat-preservation die body 1 with an opening at the top and a trapezoidal groove structure as a whole and a heat-preservation cover 2 capable of covering the opening, wherein the area of the opening is larger than that of the bottom of the die body 1;
s2, pouring, namely paving a layer of solid manganese-silicon alloy slag at the bottom of the mold body 1, and pouring liquid manganese-silicon alloy hot slag generated during manganese-silicon alloy production into the mold body 1;
s3, cooling, after the step S2 is completed, covering the heat-preservation cover 2 on the opening of the die body 1, standing for 12-36h, and then demoulding to obtain a pouring block;
s4, crushing, namely, carrying out three-stage crushing on the pouring block prepared in the step S3 to obtain crushed materials;
s5, screening, namely screening the crushed material obtained in the step S4 to remove particles and powder with unsatisfactory particle size, and finally preparing coarse aggregate or fine aggregate;
s6, sand making, namely putting the coarse aggregate or the fine aggregate prepared in the step S5 into a sand making machine to prepare sand aggregate suitable for concrete or mortar.
In this implementation, the mold body 1 includes the inner layer 101 and the outer layer 102, the first heat preservation layer 103 is filled between the inner layer 101 and the outer layer 102, the heat preservation cover 2 includes the hollow shell 201, the shell 201 intussuseption is filled with the second heat preservation layer 202, the thickness of the first heat preservation layer 103 and the second heat preservation layer 202 is 10-15cm, and the mold body 1 can be completely sealed when the heat preservation cover 2 covers the mold body 1.
In this embodiment, the inner layer 101 is cast iron, and the outer layer 102 and the housing 201 are both steel plates.
In this embodiment, the inner layer 101 is welded to the outer layer 102.
In this embodiment, the first insulating layer 103 and the second insulating layer 202 are made of mineral wool, ceramic fiber, or glass wool.
In this implementation, the outer surface coating of inlayer 101 has yellow mud layer or refractory soil layer to protect cast iron inlayer 101, avoid high temperature manganese silicon alloy hot melt sediment to produce the damage to the inlayer.
In this embodiment, the three-stage crushing in step S4 includes a jaw crusher as the first-stage crushing, a cone crusher as the second-stage crushing, and an impact crusher as the third-stage crushing in sequence, so as to sufficiently crush the casting block step by step.
In the implementation, the grain size grade of the coarse aggregate is 5-25mm, and the grain size grade of the fine aggregate is 0.15-5 mm.
The application of the sandstone aggregate prepared by the method and the coarse aggregate or the fine aggregate in the preparation of concrete or mortar for civil engineering or constructional engineering.
Description of the experimental examples:
preparing manganese-silicon alloy hot slag sandstone aggregate according to the method provided by the invention, wherein the particle size fraction of coarse aggregate is 5-25mm, the particle size fraction of fine aggregate is 5-0.15mm, 42.5 ordinary portland cement and second-level fly ash are adopted as cementing materials, a water reducing agent is polycarboxylic acid dry powder, concrete of the following experimental examples is prepared, and the slump, the expansion degree and the compressive strength change of the concrete are tested; wherein the addition amounts of the cementing material, the coarse aggregate, the fine aggregate and the water are the addition mass (kg) corresponding to each cubic concrete, and the unit of the slump and the extensibility is mm.
Experimental example 1
The C30 concrete is prepared according to the specification, and the addition amount and the experimental condition of each component are as follows:
c30 concrete proportion and slump and expansion:
c30 concrete strength change condition:
| age/d | 3 | 7 | 28 |
| Compressive strength/MPa | 11.06 | 24.79 | 35.34 |
Experimental example 2
The C30 concrete is prepared according to the specification, and the addition amount and the experimental condition of each component are as follows:
c40 concrete proportioning and slump and expansion
C40 concrete strength change condition:
| age/d | 3 | 7 | 28 |
| Compressive strength/MPa | 14.67 | 33.12 | 46.85 |
Experimental example 3
Preparing manganese-silicon alloy hot slag sandstone aggregate according to the method provided by the invention, wherein the particle size fraction of coarse aggregate is 5-25mm, the particle size fraction of fine aggregate is 5-0.15mm, 42.5 ordinary portland cement and 95-grade mineral powder are adopted as cementing materials, a polycarboxylic acid dry powder is adopted as a water reducing agent, high-performance concrete is prepared, and the slump, the expansion degree and the compressive strength change of the concrete are tested; wherein the addition amounts of the cementing material, the coarse aggregate, the fine aggregate and the water are the addition mass (kg) corresponding to each cubic concrete, and the unit of the slump and the extensibility is mm.
High-performance concrete proportion, slump and expansion:
high-performance concrete strength:
| age/d | 3 | 7 | 28 |
| Compressive strength/MPa | 61.54 | 73.79 | 89.34 |
Through the experimental examples, the sandstone aggregate prepared by the method for preparing the sandstone aggregate by utilizing the manganese-silicon alloy hot-melt slag provided by the invention is applied to concrete, the concrete has good and stable performance, the registration of permeability resistance, carbonization resistance and sulfate resistance meets the requirements, and the alkali aggregate reaction does not occur, so that the sandstone aggregate can be applied to concrete and mortar in constructional engineering and civil engineering.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A method for preparing sandstone aggregate by utilizing manganese-silicon alloy hot-melt slag is characterized by comprising the following preparation processes:
s1, manufacturing a die, namely manufacturing a heat-preservation die body (1) with an opening at the top and a trapezoidal groove structure as a whole and a heat-preservation cover (2) capable of covering the opening, wherein the area of the opening is larger than that of the bottom of the die body (1);
s2, pouring, namely paving a layer of solid manganese-silicon alloy slag at the bottom of the die body (1), and pouring liquid manganese-silicon alloy hot slag generated in the production of manganese-silicon alloy into the die body (1);
s3, cooling, after the step S2 is completed, covering the heat-preservation cover (2) on the opening of the die body (1), standing for 12-36h, slowly cooling in a heat-preservation state, and then demolding to obtain a pouring block;
s4, crushing, namely, carrying out three-stage crushing on the pouring block prepared in the step S3 to obtain crushed materials;
s5, screening, namely screening the crushed material obtained in the step S4 to remove particles and powder with unsatisfactory particle size, and finally preparing coarse aggregate or fine aggregate;
s6, sand making, namely putting the coarse aggregate or the fine aggregate prepared in the step S5 into a sand making machine to prepare sand aggregate suitable for concrete or mortar.
2. The method for preparing the sandstone aggregate by using the manganese-silicon alloy hot-melt slag according to claim 1, wherein the method comprises the following steps: the die body (1) comprises an inner layer (101) and an outer layer (102), a first heat-insulating layer (103) is filled between the inner layer (101) and the outer layer (102), the heat-insulating cover (2) comprises a hollow shell (201), and a second heat-insulating layer (202) is filled in the shell (201).
3. The method for preparing the sandstone aggregate by using the manganese-silicon alloy hot-melt slag according to claim 2, wherein the method comprises the following steps: the inner layer (101) is made of cast iron, and the outer layer (102) and the shell (201) are both made of steel plates.
4. The method for preparing the sandstone aggregate by using the manganese-silicon alloy hot-melt slag according to claim 3, wherein the method comprises the following steps: the inner layer (101) is welded to the outer layer (102).
5. The method for preparing the sandstone aggregate by using the manganese-silicon alloy hot-melt slag according to claim 2, wherein the method comprises the following steps: the first heat-insulating layer (103) and the second heat-insulating layer (202) are made of mineral wool, ceramic fiber or glass wool.
6. The method for preparing the sandstone aggregate by using the manganese-silicon alloy hot-melt slag according to claim 2, wherein the method comprises the following steps: the outer surface of the inner layer (101) is coated with a yellow mud layer or a refractory soil layer.
7. The method for preparing the sandstone aggregate by using the manganese-silicon alloy hot-melt slag according to claim 1, wherein the method comprises the following steps: and the third-stage crushing in the step S4 is that a jaw crusher is used as first-stage crushing, a cone crusher is used as second-stage crushing, and an impact crusher is used as third-stage crushing in sequence.
8. The method for preparing the sandstone aggregate by using the manganese-silicon alloy hot-melt slag according to claim 1, wherein the method comprises the following steps: the coarse aggregate has a particle size grade of 5-25mm, and the fine aggregate has a particle size grade of 0.15-5 mm.
9. Use of a sand aggregate prepared by the process of claim 1, wherein: the coarse aggregate or the fine aggregate is applied to the preparation of concrete or mortar in civil engineering or constructional engineering.
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| CN202011414058.2A CN112390559B (en) | 2020-12-03 | 2020-12-03 | Method for preparing sandstone aggregate by utilizing manganese-silicon alloy hot-melt slag and application |
| AU2021206923A AU2021206923B2 (en) | 2020-12-03 | 2021-07-26 | Method for preparing sand aggregate by using ferromanganese silicon hot slag and application thereof |
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| US7537655B2 (en) * | 2006-07-21 | 2009-05-26 | Excell Technologies, Llc | Slag concrete manufactured aggregate |
| CN103834752B (en) * | 2014-03-04 | 2015-04-08 | 北京科技大学 | Thermal-state slag online modification device |
| JP6316626B2 (en) * | 2014-03-17 | 2018-04-25 | 日新製鋼株式会社 | Civil engineering materials and methods for producing the same |
| CN106048107B (en) * | 2016-07-18 | 2018-08-28 | 东北大学 | A kind of method of titaniferous mixing slag melting and reducing production and modifier treatment |
| CN107021641B (en) * | 2017-04-20 | 2020-02-18 | 中冶东方工程技术有限公司 | Method for producing mineral wool from manganese-silicon alloy slag |
| CN107377170B (en) * | 2017-09-01 | 2023-09-29 | 中国水利水电第十六工程局有限公司 | Artificial gravel aggregate production system |
| CN109111139A (en) * | 2018-09-18 | 2019-01-01 | 关得飞 | A method of superfine powder for building is produced using manganese-silicon smelting tailing |
| CN110395926A (en) * | 2019-08-08 | 2019-11-01 | 唐山学院 | A kind of steel-slag mixture and preparation method thereof and Creep Characteristics detection method |
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