AU2021104088A4 - Method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag and applications thereof - Google Patents
Method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag and applications thereof Download PDFInfo
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- AU2021104088A4 AU2021104088A4 AU2021104088A AU2021104088A AU2021104088A4 AU 2021104088 A4 AU2021104088 A4 AU 2021104088A4 AU 2021104088 A AU2021104088 A AU 2021104088A AU 2021104088 A AU2021104088 A AU 2021104088A AU 2021104088 A4 AU2021104088 A4 AU 2021104088A4
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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
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to a method for preparing porous lightweight fine aggregate and
micropowder from manganese-silicon slag. Hot melt slag of manganese-silicon alloy is processed
by water quenching, drying, crushing and multi-stage screening to obtain fine aggregate and
manganese-silicon powder with a fineness modulus of 3.0-1.5. The fine aggregate and manganese
silicon powder are used as concrete admixtures. The present invention effectively reduces the mass
of concrete, effectively reduces resource waste, and has good energy saving and environmental
protection effects. At the same time, the present invention provides a new source of raw material for
the fine aggregate required by civil engineering and building construction, and has good economic
benefits.
10004
2010.2
Description
Description METHOD FOR PREPARING POROUS LIGHTWEIGHT FINE AGGREGATE AND MICROPOWDER FROM MANGANESE-SILICON SLAG AND APPLICATIONS THEREOF
Technical Field The present invention belongs to the technical field of manganese-silicon slag processing, and relates to a method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag and applications thereof. Background Manganese-silicon alloy is a compound deoxidizer commonly used in steel making, and almost all types of steel need to be deoxidized by manganese. Since 2018, the yield of pig iron and crude steel in China has shown a positive growth, so the demand for manganese-silicon alloy remains stubbornly high. Manganese-silicon alloy slag is a kind of blast furnace slag formed by water quenching of high temperature furnace slag discharged in smelting process of manganese-silicon alloy, about 1.2-1.3 tons of manganese-silicon alloy slag is produced for every 1 ton of manganese silicon alloy produced, and a large amount of solid waste has become a major environmental pollutant. The radioactivity of and over-standard heavy metal ions in manganese-silicon slag seriously restrict the comprehensive utilization efficiency, but with the improvement of metallurgical technology, the radioactivity and heavy metal ion leaching of manganese-silicon slag have met relevant standards, which provides a prerequisite for the comprehensive utilization of manganese silicon slag. At present, the comprehensive utilization of manganese-silicon alloy slag is in various aspects. For example, in production of cement, the dosage of manganese-silicon slag is only 8%, and technologies for producing high value-added products such as mineral wool has been popularized and applied. However, due to the factors such as market saturation, the amount of manganese-silicon slag consumed by such industries only accounts for a small part of the total emissions, and the technologies cannot consume a large amount of manganese-silicon slag fundamentally. Therefore, finding a way for bulk utilization of manganese-silicon slag is a problem to be solved urgently. Manganese-silicon slag has already been used instead of soil and rocks to build highway road bed, subbase, base and road surface at home and abroad, which can not only reduce the accumulation of manganese-silicon slag, but also reduce the mining of building stone, and is favorable for preserving soil and vegetation. However, use of manganese-silicon slag as fine aggregate in civil engineering and building construction is still blank, which limits the effective ways for bulk utilization of manganese-silicon slag.
10003 2010.2 1
Description Summary The purpose of the present invention is to overcome the defects of the prior art and provide a method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag and applications thereof by conducting multi-stage screening after manganese-silicon slag is crushed to obtain fine aggregate and manganese-silicon powder with different particle diameters, so as to grade and apply the manganese-silicon slag to civil engineering and building construction according to different requirements, and realize the resource utilization of manganese-silicon slag, energy saving, environmental protection and economic cost saving. The present invention adopts the following technical solution: a method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag, comprising the following preparation process: Si. drying hot melt slag of manganese-silicon alloy after water quenching; S2. sending the dried hot melt slag of manganese-silicon alloy to a roll crushing mill for primary crushing to obtain primary crushed material; S3. feeding the primary crushed material prepared in step S2 into a first roller screen for primary screening, returning oversize products to the roll crushing mill for secondary crushing, and conducting secondary screening to undersize products; S4. conducting multi-stage screening to the undersize products obtained after primary screening in step S3 successively by a plurality of second roller screens with a mesh number increased gradually, sending the oversize products obtained by each stage of screening to a corresponding aggregate collecting bin for reserve, and feeding the undersize products obtained after screening by the last stage of second roller screen into a powder mill for full milling to obtain micropowder of manganese-silicon slag with a specific surface area of 400 m 2/kg-600 m 2 /kg; and S5. grading the corresponding oversize products obtained after multi-stage screening in step S4 in a certain proportion to obtain fine aggregate with a certain fineness modulus. Further, the first roller screen in step S3 has an aperture of 9.5 mm. Further, the plurality of second roller screens in step S4 have an aperture of 4.75 mm, 2.36 mm, 1.18 mm, 600 pm, 300 pm and 150 m respectively, the corresponding oversize products obtained have a particle diameter of 4.75 mm, 2.36 mm, 1.18 mm, 600 [m, 300 m and 150 [m respectively, and the undersize products obtained after screening by the last stage of second roller screen have a particle diameter of less than 150 m. Further, the fine aggregate obtained in step S5 has afineness modulus of 3.0-1.5. Further, when step Sl is conducted, the manganese-silicon slag is water quenched at a flow rate of not less than 965 mm 3/h to obtain an explosion-shape porous-structure material with a particle diameter of 20-50 mm.
10003 2010.2
Description An application of porous lightweight fine aggregate prepared by the above-mentioned method, wherein the fine aggregate is used in cement mortar or concrete for civil engineering and building construction to replace river sand, washed sand, etc. Further, the fine aggregate is used for preparing cement mortar; the cement mortar comprises cementing material, porous lightweight fine aggregate with a fineness modulus of 3.0-1.5, water reducing agent and water; the mass ratio of the cementing material to the porous lightweight fine aggregate is 1:1-1:4, and the mass ratio of added water to the cementing material is 0.2-0.6. Further, the fine aggregate is used for preparing concrete; the concrete comprises cementing material, micropowder of manganese-silicon slag with a specific surface area of 400 m 2/kg-600 m2/kg, porous lightweight fine aggregate with a fineness modulus of 3.0-1.5, water reducing agent, coarse aggregate of tailing waste rock, and water; the mass ratio of the water to the cementing material is 0.32-0.48, the mass ratio of the water reducing agent to the cementing material is 0.1% 0.7%, the mass ratio of the porous lightweight fine aggregate to the aggregate is 0.3-0.6, and the addition amount of the micropowder of manganese-silicon slag is 0- 4 0 %. An application of micropowder of manganese-silicon slag prepared by the above-mentioned method, wherein the micropowder of manganese-silicon slag is used as a mineral admixture of cement in a proportion of 0- 3 0 % by weight to prepare the cementing material. Compared with the prior art, the present invention has the following beneficial effects: 1. According to the present invention, manganese-silicon slag is processed by water quenching, primary screening, and multi-stage secondary screening as required to prepare fine aggregate, and the fine aggregate is graded as required and then applied to civil engineering and building construction, which can effectively avoid the phenomena such as bleeding, segregation and no slurry inclusion in the construction process, and reduce the overall mass of concrete; 2. According to the present invention, manganese-silicon slag is processed by water quenching, primary screening, and multi-stage secondary screening as required to prepare final undersize products, and the final undersize products are fully milled to obtain manganese-silicon powder which is used as cementing material to be added into concrete or as a mineral admixture of cement, so that the strength of the concrete can be improved to a certain extent; 3. Products obtained after the manganese-silicon slag is processed by the method provided in the present invention are used as raw material of concrete for secondary utilization, so that the present invention effectively reduces resource waste, and has good energy saving and environmental protection effects. At the same time, the present invention provides a new source of raw material for the fine aggregate required by civil engineering and building construction, and has good economic benefits; 4. As the fine aggregate accounts for 30%-50% of the total amount of mortar and concrete,
10003 2010.2
Description according to the present invention, after hot melt slag of manganese-silicon alloy is fully processed, oversize fine aggregate is used as aggregate of mortar and concrete, and undersize products are used as a mineral admixture of cementing material, which effectively improves the comprehensive utilization rate of the hot melt slag of manganese-silicon alloy, and effectively solves the problem of industrial solid waste accumulation. Moreover, in the whole processing process of the hot melt slag of manganese-silicon alloy, no secondary solid waste is generated, and no damage to the environment is generated; at the same time, the excavation of mountain bodies and the exploitation of sandstone are reduced, and the ecological environment is effectively protected. Detailed Description The technical solution in the embodiments of the present invention will be clearly and fully described below in combination with the embodiments of the present invention. Apparently, the described embodiments are merely part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those ordinary skilled in the art without contributing creative labor will belong to the protection scope of the present invention. A method for preparing porous lightweight fine aggregate and micropowder from manganese silicon slag, comprising the following preparation process: Si. drying hot melt slag of manganese-silicon alloy after water quenching; S2. sending the dried hot melt slag of manganese-silicon alloy to a roll crushing mill for primary crushing to obtain primary crushed material; S3. feeding the primary crushed material prepared in step S2 into a first roller screen for primary screening, returning oversize products to the roll crushing mill for secondary crushing, and conducting secondary screening to undersize products; S4. conducting multi-stage screening to the undersize products obtained after primary screening in step S3 successively by a plurality of second roller screens with a mesh number increased gradually, sending the oversize products obtained by each stage of screening to a corresponding aggregate collecting bin for reserve, and feeding the undersize products obtained after screening by the last stage of second roller screen into a vertical powder mill for full milling for 40-90 minutes to obtain micropowder of manganese-silicon slag with a specific surface area of 400 m 2/kg-600 m 2 /kg; and S5. grading the corresponding oversize products obtained after multi-stage screening in step S4 in a certain proportion to obtain fine aggregate with a certain fineness modulus. In the embodiment, the first roller screen in step S3 has an aperture of 9.5 mm. In the embodiment, the plurality of second roller screens in step S4 have an aperture of 4.75 mm, 2.36 mm, 1.18 mm, 600 m, 300 m and 150 m respectively, the corresponding oversize
10003 2010.2 A
Description products obtained have a particle diameter of 4.75 mm, 2.36 mm, 1.18 mm, 600 [m, 300 m and 150 m respectively, and the undersize products obtained after screening by the last stage of second roller screen have a particle diameter of less than 150 m. In specific implementation, the following multi-stage screening mode is adopted: The undersize products obtained after primary screening enter a roller screen with an aperture of 4.75 mm along a chute hopper, oversize products enter an aggregate collecting bin, and undersize products enter a roller screen with an aperture of 2.36 mm along the chute hopper; oversize products obtained after screening by the roller screen with an aperture of 2.36 mm enter an aggregate collecting bin, and undersize products enter a roller screen with an aperture of 1.18 mm along the chute hopper; oversize products obtained after screening by the roller screen with an aperture of 1.18 mm enter an aggregate collecting bin, and undersize products enter a roller screen with an aperture of 600 m along the chute hopper; oversize products obtained after screening by the roller screen with an aperture of 600 m enter an aggregate collecting bin, and undersize products enter a roller screen with an aperture of 300 m along the chute hopper; oversize products obtained after screening by the roller screen with an aperture of 300 m enter an aggregate collecting bin, and undersize products enter a roller screen with an aperture of 150 m along the chute hopper; oversize products obtained after screening by the roller screen with an aperture of 300 m enter an aggregate collecting bin, and undersize products enter a roller screen with an aperture of 150 m along the chute hopper; oversize products obtained after screening by the roller screen with an aperture of 150 m enter an aggregate collecting bin, and undersize products enter the powder mill along a conveyer. In the embodiment, the fine aggregate obtained in step S5 has a fineness modulus of 3.0-1.5. In the embodiment, when step Si is conducted, the manganese-silicon slag is water quenched at a flow rate of not less than 965 mm 3/h to obtain an explosion-shape porous-structure material with a particle diameter of 20-50 mm. An application of porous lightweight fine aggregate prepared from manganese-silicon slag by the above-mentioned method, wherein the fine aggregate is used in cement mortar or concrete for civil engineering and building construction to replace river sand, washed sand, etc. The application of porous lightweight fine aggregate prepared from manganese-silicon slag by the above-mentioned method, wherein the micropowder of manganese-silicon slag is used as a mineral admixture of cement in a proportion of 0-30% by weight to prepare the cementing material. The application of porous lightweight fine aggregate prepared from manganese-silicon slag by the above-mentioned method, wherein the porous lightweight aggregate based on manganese-silicon slag has the characteristics of light weight, can reduce self-weight of mortar and concrete, and has good heat preservation and thermal insulation effects; on the other hand, the porous aggregate has a
10003 2010.2
Description function of internal curing, can increase the strength of mortar or concrete under the same mixture ratio, and can reduce engineering shrinkage cracks. The micropowder of manganese-silicon slag is used as a mineral admixture to be added into mortar or concrete, which can improve the strength of the concrete to a certain extent; this is mainly because that a large amount of Ca(OH)2 is produced during cement hydration, the cement contains 3%-5% of dihydrate gypsum, and a variety of new substances are produced by the secondary reaction of these activators and ultrafine particles of manganese-silicon slag, so that the strength of the concrete can be greatly improved. In addition, unhydrated ultrafine particles can fill the gaps between cement particles and between cement particles and the fine aggregate, so that the total porosity of the concrete is reduced, and the compactness is increased, thereby increasing the strength of the concrete, reducing the dosage of cement in the cementing material on the premise of ensuring stability, and achieving the purpose of saving cost and fully utilizing resources. Description of experiment examples: The fine aggregate and manganese-silicon powder prepared by the method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag provided by the present invention are used in the following experiment examples, and corresponding performances are tested; Experiment Example 1 One of the gradations shown in Table 1 is selected according to the crushed and screened manganese-silicon slag and used as fine aggregate for the following cases. Properties of the fine aggregate are tested, and the test results are shown in Table 2.
Table 1 Grading Results of Manganese-Silicon Slag
Aperture size Subtotal screen residue (%) Total screen residue(%)
2.36 mm 10 10
1.18 mm 15 25
600 pm 30 55
300 pm 35 90
150 pm 10 100
10003 2010.2
Description
Table 2 Properties of Lightweight Porous Aggregate after Manganese-Silicon Slag Grading
Test item Unit of measure Test result
Content of clod % 0.0
Content of particles below 75 tm % 0.0
Methylene Blue (MB) value % 0.25
Content of mica % 0.0
Content of light matters % 0.5
Content of organic matters / Color is lighter than standard
Content of sulphide and sulphate % 0.21
Firmness % 3
Apparent density kg/m3 2380
Bulk density kg/m3 990
Water content % 0.6
Content of chlorine ions % 0.005
Content of alkali % 0.01
0.15 Alkali aggregate reaction % Specimens have no fracture, crack or cement overflow
Manganese-silicon slag obtained after crushing by the roll crushing mill is screened and graded, and the fineness modulus after grading is 2.8, so the manganese-silicon slag belongs to medium sand. The properties detected after grading are in conformance with standards for building sand, so the manganese-silicon slag is suitable for use as porous lightweight fine aggregate. Experiment Example 2 Cement mortar is prepared. The cement mortar comprises cementing material, porous lightweight fine aggregate with a fineness modulus of 2.7, water reducing agent and water; the mass ratio of the cementing material to the porous lightweight fine aggregate is 1:2, and the mass ratio of added water to the cementing material is 0.4; the cementing material is ordinary Portland cement of P-042.5, and the water reducing agent is solid polycarboxylate-type high-efficiency water reducing agent. The cement mortar is tested in accordance with the mixture ratio as shown in the table above. Test blocks are cured in a standard curing box to an age of 3 days, 7 days and 28 days respectively. Rupture strength and compressive strength of tested cement mortar blocks are shown in the following table:
10003 nin '7
Description
Table 3 Strengths of Cement Mortar Specimens at Different Ages
Test item 3d 7d 28d
Rupture strength/MPa 1.9 3.06 3.2
Compressive strength/MPa 23.18 30.99 40.3
It can be known from the above data that under this mixture ratio, the compressive strength of the cement mortar blocks at the age of 28 days can reach 40.3 Mpa, which meets application requirements. Fluidity of the cement mortar is tested in accordance with GB/T2419-2005 Test Methodfor Fluidity of Cement Mortar. The fluidity of the cement mortar obtained is 190 mm, and the operational performance is good. Experiment Example 3 A concrete is prepared. The concrete comprises cementing material, porous lightweight fine aggregate with a fineness modulus of 2.6, water reducing agent, coarse aggregate of tailing waste rock, and water; the mass ratio of the water to the cementing material is 0.43, the mass ratio of the water reducing agent to the cementing material is 0.5%, and the mass ratio of the porous lightweight fine aggregate to the aggregate is 0.4; the cementing material is ordinary Portland cement of P-042.5, and the water reducing agent is solid polycarboxylate-type high-efficiency water reducing agent. The concrete is tested in accordance with the above mixture ratio. Test blocks are cured in a standard curing box to an age of 3 days, 7 days and 28 days respectively. Compressive strength of tested concrete test blocks is shown in the following table:
Table 4 Variation of Compressive Strength of Concrete at Different Ages under Different Mixture Ratios
Test item 3d 7d 28d
GMZ1 compressive strength (MPa) 51.54 63.79 79.34
It can be known from the above data that under this mixture ratio, the compressive strength of the concrete at the age of 28 days can reach 79.34 Mpa, which meets C80 requirements. Operational performance of the concrete is tested in accordance with GB/T50080-2011 StandardforTest Method ofPerformance on OrdinaryFresh Concrete. The slump obtained is 185 mm, the slump flow is 440 mm, and the operational performance is good. Experiment Example 4 A concrete is prepared. The concrete comprises cementing material, micropowder of manganese-silicon slag with a specific surface area of 500 m2 /kg, porous lightweight fine aggregate
Description with a fineness modulus of 2.7, water reducing agent, coarse aggregate of tailing waste rock, and water; the mass ratio of the water to the cementing material is 0.32-0.48, the mass ratio of the water reducing agent to the cementing material is 0.5%, the mass ratio of the porous lightweight fine aggregate to the aggregate is 0.4, and the addition amount of the micropowder of manganese-silicon slag is 30%; the cementing material is 70% of ordinary Portland cement of P-042.5, the water reducing agent is solid polycarboxylate-type high-efficiency water reducing agent, and the micropowder of manganese-silicon slag is used as a mineral admixture of the cementing material. The concrete is tested in accordance with the above mixture ratio. Test blocks are cured in a standard curing box to an age of 3 days, 7 days and 28 days respectively. Compressive strength of tested concrete test blocks is shown in the following table:
Table 5 Variation of Compressive Strength of Concrete at Different Ages under Different Mixture Ratios
Item 3d 7d 28d
GMZ3 compressive strength (MPa) 36.24 68.40 81.56
It can be known from the above data that under this mixture ratio, the compressive strength of the concrete at the age of 28 days can reach 81.56 Mpa, which meets C80 requirements. Operational performance of the concrete is tested in accordance with GB/T50080-2011 StandardforTest Method of Performance on Ordinary Fresh Concrete. The slump obtained is 220 mm, the slump flow is greater than 500 mm, and the operational performance is good. Although the present invention is described in detail by referring to the above embodiments, those skilled in the art can amend the technical solution recorded in each of the above embodiments, or some technical features therein can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. made within the spirit and the principle of the present invention shall be contained within the protection scope of the present invention.
Claims (9)
1. A method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag, comprising the following preparation process: Si. drying hot melt slag of manganese-silicon alloy after water quenching; S2. sending the dried hot melt slag of manganese-silicon alloy to a roll crushing mill for primary crushing to obtain primary crushed material; S3. feeding the primary crushed material prepared in step S2 into a first roller screen for primary screening, returning oversize products to the roll crushing mill for secondary crushing, and conducting secondary screening to undersize products; S4. conducting multi-stage screening to the undersize products obtained after primary screening in step S3 successively by a plurality of second roller screens with a mesh number increased gradually, sending the oversize products obtained by each stage of screening to a corresponding aggregate collecting bin for reserve, and feeding the undersize products obtained after screening by the last stage of second roller screen into a powder mill for full milling to obtain micropowder of manganese-silicon slag with a specific surface area of 400 m 2/kg-600 m 2 /kg; and S5. grading the corresponding oversize products obtained after multi-stage screening in step S4 in a certain proportion to obtain fine aggregate with a certain fineness modulus.
2. The method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag according to claim 1, wherein the first roller screen in step S3 has an aperture of 9.5 mm.
3. The method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag according to claim 1, wherein the plurality of second roller screens in step S4 have an aperture of 4.75 mm, 2.36 mm, 1.18 mm, 600 [m, 300 m and 150 m respectively, the corresponding oversize products obtained have a particle diameter of 4.75 mm, 2.36 mm, 1.18 mm, 600 [m, 300 m and 150 m respectively, and the undersize products obtained after screening by the last stage of second roller screen have a particle diameter of less than 150 m.
4. The method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag according to claim 1, wherein the fine aggregate obtained in step S5 has a fineness modulus of 3.0-1.5.
5. The method for preparing porous lightweight fine aggregate and micropowder from manganese-silicon slag according to claim 1, wherein when step Sl is conducted, the manganese silicon slag is water quenched at a flow rate of not less than 965 mm3/h to obtain an explosion-shape porous-structure material with a particle diameter of 20-50 mm.
6. An application of porous lightweight fine aggregate prepared by the method of claim 1, wherein the fine aggregate is used in cement mortar or concrete for civil engineering and building construction to replace river sand or washed sand. 10001
Claims
7. The application of porous lightweight fine aggregate according to claim 6, wherein the fine aggregate is used for preparing cement mortar; the cement mortar comprises cementing material, porous lightweight fine aggregate with a fineness modulus of 3.0-1.5, water reducing agent and water; the mass ratio of the cementing material to the porous lightweight fine aggregate is 1:1-1:4, and the mass ratio of added water to the cementing material is 0.2-0.6.
8. The application of porous lightweight fine aggregate according to claim 6, wherein the fine aggregate is used for preparing concrete; the concrete comprises cementing material, micropowder of manganese-silicon slag with a specific surface area of 400 m 2/kg-600 m 2 /kg, porous lightweight fine aggregate with a fineness modulus of 3.0-1.5, water reducing agent, coarse aggregate of tailing waste rock, and water; the mass ratio of the water to the cementing material is 0.32-0.48, the mass ratio of the water reducing agent to the cementing material is 0.1%-0.7%, the mass ratio of the porous lightweight fine aggregate to the aggregate is 0.3-0.6, and the addition amount of the micropowder of manganese-silicon slag is 0-40%.
9. An application of micropowder of manganese-silicon slag prepared by the method of claim 1, wherein the micropowder of manganese-silicon slag is used as a mineral admixture of cement in a proportion of 0-30% by weight to prepare the cementing material.
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| CN202011415152.XA CN112500005B (en) | 2020-12-03 | 2020-12-03 | Method for preparing porous light fine aggregate and micro powder from manganese-silicon slag and application |
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| CN102180612B (en) * | 2011-01-20 | 2013-03-06 | 葫芦岛市辽西混凝土外加剂有限公司 | Composite admixture for cement or high-performance concrete and preparation method thereof |
| CN103693916B (en) * | 2013-12-18 | 2015-07-29 | 北京东方建宇混凝土科学技术研究院有限公司 | A kind of lightweight aggregate concrete and preparation method thereof |
| CN205275463U (en) * | 2015-12-09 | 2016-06-01 | 武汉科技大学 | Little table department is with slag system of processing that gathers materials |
| KR101795570B1 (en) * | 2016-05-24 | 2017-11-09 | 주식회사 씨큐알 | Urgently Repair Material of Road Using Silicon Manganese Slag and Repairing Method Using the Same |
| CN106747058A (en) * | 2016-11-28 | 2017-05-31 | 广西铁合金有限责任公司 | Double-layer baking-free permeable brick with silicon manganese alloy slag as aggregate and preparation method thereof |
| KR101957366B1 (en) * | 2016-12-05 | 2019-03-13 | 주식회사 에코마이스터 | Silicon manganese slag light weight aggregate and it's manufacturing method |
| CN111574168A (en) * | 2020-06-18 | 2020-08-25 | 湘潭大学 | A kind of silicon manganese water quenched slag concrete |
-
2020
- 2020-12-03 CN CN202011415152.XA patent/CN112500005B/en active Active
-
2021
- 2021-07-13 AU AU2021104088A patent/AU2021104088A4/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN112500005A (en) | 2021-03-16 |
| CN112500005B (en) | 2022-08-30 |
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