CN108033695B - Superfine high-activity steel slag powder and preparation method thereof - Google Patents
Superfine high-activity steel slag powder and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 161
- 239000010959 steel Substances 0.000 title claims abstract description 161
- 239000002893 slag Substances 0.000 title claims abstract description 158
- 239000000843 powder Substances 0.000 title claims abstract description 141
- 230000000694 effects Effects 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000004568 cement Substances 0.000 claims abstract description 39
- 229910052742 iron Inorganic materials 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000004567 concrete Substances 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 238000007885 magnetic separation Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 125000004122 cyclic group Chemical group 0.000 abstract 3
- 239000011398 Portland cement Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- GFRROZIJVHUSKZ-FXGMSQOLSA-N OS I Natural products C[C@@H]1O[C@@H](O[C@H]2[C@@H](O)[C@@H](CO)O[C@@H](OC[C@@H](O)[C@@H](O)[C@@H](O)CO)[C@@H]2NC(=O)C)[C@H](O)[C@H](O)[C@H]1O GFRROZIJVHUSKZ-FXGMSQOLSA-N 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 241000565674 Oncomelania hupensis Species 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000006148 magnetic separator Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010332 dry classification Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
- C04B7/19—Portland cements
-
- 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
-
- 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
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- 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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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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Abstract
The invention provides superfine high-activity steel slag powder and a preparation method thereof. The preparation method provided by the invention comprises the following steps: the superfine high-activity steel slag powder is prepared by utilizing three-cycle process technologies of cyclic magnetic iron removal, cyclic superfine dry type winnowing classification and cyclic high-fine grinding. The superfine high-activity steel slag powder prepared by the invention ensures that the content of metallic iron is less than or equal to 0.5 percent, the average grain diameter is controlled to be less than or equal to 6.0 mu m, and the specific surface area reaches more than or equal to 850m2The product has high early compressive strength per kilogram. The 3-day compressive strength activity index (%) is more than or equal to 85, and is 1.55 times of the specified value of the 7-day compressive strength activity index of GB/T20491 secondary steel slag powder which is steel slag powder used in cement and concrete in the national standard; the 28-day compressive strength activity index (%) is more than or equal to 95 and is 1.46 times of the specified value of GB/T20491 secondary steel slag powder.
Description
Technical Field
The invention belongs to the technical field of steel slag utilization, and particularly relates to superfine high-activity steel slag powder and a preparation method thereof.
Technical Field
The steel output of China accounts for 80% of the total world amount, steel slag tailings discharged every year exceed 5000 million tons, the occupied land reaches thousands of hectares, and the method threatens the ecological environment of peripheral areas of steel plants and seriously restricts the sustainable development of the steel industry of China.
In 2006, the national standard 'steel slag powder used in cement and concrete', namely GB/T20491, is released, and a guide fund is established to propose a batch of steel slag micro-powder enterprises to be built, so that the aims of zero discharge of steel slag and annual consumption of 5000 ten thousand tons of steel slag are achieved, and the industrial development of steel slag tailing powder production is promoted. In 2015, 10 production lines of more than 20 ten thousand tons of steel slag powder prepared from steel slag tailings are built in each part of the country. The production process has introduction, joint investment and domestic research and development, but the prepared steel slag powder has the compressive strength activity index only meeting the national standard of steel slag powder used in cement and concrete, namely the secondary standard of GB/T20491, and has limited market popularization.
At present, the steel slag powder production line built in China is basically in the states of clearing, stopping production and intermittent production. The reason is that: the compressive strength activity index (%) of the product is only more than or equal to 55 in 7 days; is only more than or equal to 65 in 28 days; the national standard of slag powder of similar products, namely granulated blast furnace slag powder used in cement and concrete, is the specified value of GB/T18046 secondary products: the compressive strength activity index (%) is more than or equal to 75 in 7 days; more than or equal to 95 in 28 days. Obviously, there is a technical bottleneck for the steel slag powder to enter the concrete or cement market like the slag powder. Moreover, the investment intensity of the steel slag powder making equipment and the energy consumption of unit products are more than twice of that of slag powder making.
Disclosure of Invention
The invention provides superfine high-activity steel slag powder and a preparation method thereof.
The superfine high-activity steel slag powder obtained by the preparation method of the superfine high-activity steel slag powder provided by the invention is mainly technically characterized in that:
1) the average grain diameter is less than or equal to 6 mu m; 2) the specific surface area is more than or equal to 850m2/kg；
3) The metal iron is less than or equal to 0.5 percent; 4) compressive strength activity index (%): more than or equal to 85 in 3 days; more than or equal to 95 in 28 days. The invention provides a preparation method of superfine high-activity steel slag powder, which comprises the following steps:
1) the compressive strength activity index (%) is more than or equal to 55% in 7 days; more than or equal to 65% in 28 days and more than or equal to 400m in specific surface area2In terms of volume/kg, other technical indexes also meet the national standard of steel slag powder used in cement and concrete, namely, the second-level steel slag powder of GB/T20491 is used as a raw material, and after circular magnetic separation, the metal iron is less than or equal to 0.5 percent, so that the steel slag powder with good activity and low-activity and weak-magnetism residue mainly containing ferric oxide can be obtained; the magnetic field intensity of the circular magnetic separation is more than or equal to 2500 (GS); the invention carries out circular magnetic separation on the steel slag powder raw material, removes the metallic iron in the raw material, and reduces the abrasion caused by the metallic iron to a rotor and superfine winnowing equipment which run at a high speed of 100m per second; also removing part of the low-activity and weak-magnetism residues which mainly comprise ferric oxide in the raw materials,and (3) feeding the steel slag powder raw material with good activity into the next superfine classification procedure.
2) The active steel slag powder with the metal iron content less than or equal to 0.5 percent obtained by the circular magnetic separation is sent to the next procedure, the superfine air separation equipment with the rotor line speed of 100m per second carries out dry classification, the average particle size of the superfine classification is positioned below 6 mu m, and the specific surface area of the obtained superfine high-activity steel slag powder with the average particle size less than or equal to 6 mu m can reach more than or equal to 850m2More than kg, which exceeds the specified value of GB/T20491 second-grade steel slag powder which is steel slag powder used in cement and concrete of the national standard, namely 2 times.
3) The average grain diameter of the active steel slag powder under the superfine grading sieve is more than 6 mu m, the active steel slag powder is introduced into a horizontal high-fine grinding machine, and the specific surface area is more than or equal to 400m by grinding2And/kg, returning the steel slag powder and the newly fed steel slag powder raw material to enter the circulating magnetic separation iron removal process of the step 1, removing the metal iron enriched in the steel slag powder after superfine air separation and classification, and removing the metal iron generated in the grinding process; then the mixture is recycled to the step 2), superfine high-activity steel slag powder with the average particle size of less than or equal to 6.0 mu m can be obtained, and the active steel slag powder with the average particle size of more than 6 mu m is recycled to a horizontal high-activity fine grinding machine, so that the specific surface area of the horizontal high-activity fine grinding machine is more than or equal to 400 square meters per kilogram.
The invention has the advantages that:
(1) the method for preparing the superfine high-activity steel slag powder improves the activity of the steel slag powder by a circular magnetic separation iron removal process, so that the steel slag powder used in cement and concrete meets the national standard, namely the metal iron in the second-level steel slag powder of GB/T20491 is less than or equal to 0.5 percent, and then the raw material with good activity is sent to the next superfine classification process.
(2) The method for preparing the superfine high-activity steel slag powder locates the average particle size of superfine classification below 6 mu m, and the specific surface area of the obtained steel slag powder with the average particle size of less than or equal to 6 mu m can be more than or equal to 850m2The volume ratio of the steel slag powder exceeds that of steel slag powder used in cement and concrete, namely more than 2 times of the specified value of GB/T20491 secondary steel slag powder; the active steel slag powder under the grading sieve is more than 6 mu m, is introduced into a high-fine mill, and the specific surface area is more than or equal to 400m by grinding2The steel slag powder is returned to enter a circulating magnetic separation iron removal procedure together with a newly fed steel slag powder raw material, and a removal grinding procedureThe generated metallic iron is also removed from the enriched metallic iron after the superfine air classification, so that the metallic iron content in the active steel slag powder circularly entering the superfine air classification is ensured to be less than or equal to 0.5 percent, the abrasion of the metallic iron to a rotor and superfine air classification equipment which run at a linear speed of 100m per second at a high speed is reduced, and the continuous operation of the superfine circulating classification process is ensured.
(3) The superfine high-activity steel slag powder prepared by the invention is characterized in that: the 3-day compressive strength activity index (%) is more than or equal to 85, and is 1.55 times of the specified value of the 7-day compressive strength activity index (%) of the GB/T20491 second-level steel slag powder which is steel slag powder used in cement and concrete in the national standard; the 28-day compressive strength activity index (%) is more than or equal to 95 and is 1.46 times of the specified value of steel slag powder used in cement and concrete in the national standard, namely GB/T20491 secondary steel slag powder. The technical achievement of the superfine high-activity steel slag powder of the invention becomes a new mark post in the industry, and the invention can apply to the implemented steel slag powder national standard steel slag powder used in cement and concrete, namely GB/T20491, which proposes the revision of technical upgrading.
(4) The invention uses the process technologies of circulating magnetic iron removal, circulating superfine classification and circulating high-fine grinding to prepare the superfine high-activity steel slag powder with the average grain diameter of less than or equal to 6.0 mu m and the specific surface area of more than or equal to 850m2The compressive strength activity index of the product in 3 days is more than or equal to 85 percent and exceeds the specified value (80 percent) of the compressive strength activity index of the national standard first-grade steel slag powder in 28 days; the activity index of the pressure resistance intensity continuously rises to be more than or equal to 95 percent after 28 days. The technical achievement of the process for preparing the superfine high-activity steel slag powder is not related in academic reports of universities and scientific research institutions so far, and the originality and the innovation are obvious.
(5) Can fill up the technical blank that China does not have 52.5 grade steel slag portland cement
1) The national standard of the steel slag portland cement stipulates that 30% of steel slag powder needs to be mixed in the product. Because the activity index of the steel slag powder product is low in China, the compressive strength of the product after the steel slag powder is mixed into the cement only meets 42.5 grades, and the steel slag silicate cement with the strength of 52.5 grades does not exist in the national standard so far.
2) For measuring the activity of the steel slag powder, the national standard also provides that 30 percent of the steel slag powder needs to be mixed into the standard cement. As can be seen from the examples of the present application, after the superfine high activity steel slag powder of the present invention is mixed with the standard cement of 52.5 grade by 30%, the compression strength of the cement reaches the national standard specified value of the cement strength of 52.5 grade in both 3 days and 28 days (the compression strength of 3 days is more than or equal to 23MPa, and the compression strength of 28 days is more than or equal to 52.5 MPa). 30 percent of superfine high-activity steel slag powder is mixed, steel slag cement is produced by using a preparation process, the technical and market blank that the national standard of 52.5 grade steel slag portland cement does not exist can be filled, and the revision application of technical upgrade can be provided for the national standard of steel slag portland cement, namely GB 13590.
3) Cement is a highly polluting, energy consuming industry. Producing one ton of 42.5 grade cement according to the national standard of the energy consumption limit of cement unit products, namely, 88 kg of standard coal is consumed in GB 16780-2012. The superfine high-activity steel slag powder is used for replacing part of cement, and more than 50 kg of standard coal can be saved by using one ton of the superfine high-activity steel slag powder, so that the cement has the effects of energy conservation and emission reduction, and is a green cement product encouraged by the government to develop.
4) The 52.5-grade steel slag portland cement is produced by using the superfine high-activity steel slag powder through a preparation process, the technical added value of a steel slag powder product can be improved, a steel slag powder making enterprise can be in full of deficiency, and the national strategic target of zero discharge of the steel slag is favorably realized.
Drawings
FIG. 1 is a process flow chart of the preparation method of the ultra-fine high-activity steel slag powder of the present invention.
Detailed Description
(one) experimental equipment:
(1) dry method magnetic machine
The model is as follows: XCG-11; magnetic field strength (GS): (1500-14000) is adjustable;
treatment capacity: (2-25) kg/hr
(2) Superfine dry-method winnowing classifier
The model is as follows: OS-I; treatment capacity: (20-50) kg/h;
rotor linear velocity: (80-100) m/s is adjustable;
(3) high and fine grinding tester
The model is as follows: QM-480-600; treatment capacity (5-10) kg: rotating speed: 48 turns/minute (Adjustable)
The grain diameter of the product is less than 10 mu m
Secondly, according to the technological process of the preparation method of the superfine high-activity steel slag powder shown in the figure 1, the steel slag powder which is used in cement and concrete and meets the national standard, namely GB/T20491 secondary steel slag powder, is taken as a raw material and is circularly treated according to the working procedures.
Example (1)
1) The steel slag powder for cement and concrete, namely GB/T20491 secondary steel slag powder, which meets the national standard of steel slag powder for cement and concrete in Anhui steel mills, is used as a raw material, and has the following main technical indexes:
the average particle size was 12.4. mu.m; 1.94% of metallic iron and 422m of specific surface area2Kg, density 3.41g/cm3
2) 160 kg of raw steel slag is firstly put into a dry-method magnetic separator in batches, the magnetic field intensity is adjusted to 2500(GS), the feeding amount is adjusted to 20 kg/h, and an automatic feeding button is started. After 8 hours, a specific surface area of 422m was obtained2145 kg of active steel slag powder per kg, the content of metallic iron is reduced to 0.42 percent, and 15 kg of low-activity and weak-magnetism residue is obtained.
3) 100 kg of active steel slag powder is put into a bin of an OS-I type superfine classifier, the linear speed of a rotor is adjusted to be 100m per second, an automatic feeding button is started, and dry type winnowing and classification are carried out. After 3 hours, an average particle size of 5.8 μm and a density of 2.90g/cm were obtained3A specific surface area of 860m242 kg of superfine high-activity steel slag powder per kg and 56 kg of active steel slag powder with the average grain diameter of 23 mu m.
4) 5kg of active steel slag powder with the average grain diameter of 23 mu m is put into a QM-480-600 horizontal high-fine grinding tester, the rotating speed is adjusted to be 48 r/min, and grinding is carried out for 20 min. The average grain diameter of the ground active steel slag powder is reduced to 12 mu m, and the specific surface area is increased to 412m2And/kg, the content of metal iron is increased to 1.2 percent, and the metal iron and the newly fed steel slag powder raw material sequentially enter a circulating magnetic separation iron removal process and an ultrafine classification process together, so that the process flow of the ultrafine high-activity steel slag powder can be operated circularly and continuously.
5) Ultra-fine high-activity steel slag powder activity test
The specific surface areas 412m prepared above were weighed respectively25kg of/kg of active steel slag powder (serial number 3); 5kg of superfine high-activity steel slag powder (serial number 4); a certain steel mill in Anhui accords with the national standard of steel slag powder used in cement and concrete, namely 5kg (serial number 2) of GB/T20491 secondary steel slag powder; the standard cement is 5kg (sequence number 1), and the standard cement is 52.5 grade common portland cement produced by the Oncomelania Hupensis Gregorian company. The samples of example 1 (No. 4), (No. 3), (No. 2) and (No. 1) were each tested for compressive strength and activity index according to the method specified in the national Standard "Steel slag powder for use in cements and concretes", GB/T20491. The test results are listed in table 1.
Table 1: test results of compressive strength and activity index of superfine high-activity steel slag powder and Anhui secondary steel slag powder
Example 2
1) The steel works in Shandong accord with the national standard of Steel slag powder used in cement and concrete, namely GB/T20491 Secondary Steel slag powder is used as a raw material, and the main technical indexes are as follows:
the average particle diameter is 13 μm; the content of the metal iron is 2.34 percent, the specific surface area is 402 square meters per kilogram, and the density is 3.60g/cm3
2) 160 kg of raw steel slag is firstly put into a dry-method magnetic separator in batches, the magnetic field intensity is adjusted to 2500(GS), the feeding amount is adjusted to 20 kg/h, and an automatic feeding button is started. Obtaining 144 kilograms of active steel slag powder with the specific surface area of 402 square meters per kilogram after 8 hours, reducing the content of metal iron to 0.42 percent and 16 kilograms of low-activity and weakly magnetic residues
3) 100 kg of active steel slag powder is put into a bin of an OS-I type superfine classifier, the linear speed of a rotor is adjusted to be 100m per second, an automatic feeding button is started, and dry type winnowing and classification are carried out. After 3 hours, an average particle size of 5.5 μm and a density of 2.92g/cm were obtained3A specific surface area of 875m241 kg of superfine high-activity steel slag powderAnd 58 kg of active steel slag powder with the average grain diameter of 25 mu m.
4) 5kg of active steel slag powder with the average grain diameter of 25 mu m is put into a QM-480-600 horizontal high-fine grinding tester, the rotating speed is adjusted to be 48 r/min, and grinding is carried out for 20 min. The average grain diameter of the ground active steel slag powder is reduced to 14 mu m, and the specific surface area is increased to 400m2And/kg, the content of metal iron is increased to 1.7 percent, and the steel slag powder and a newly fed steel slag powder raw material sequentially enter a circulating magnetic separation iron removal process and an ultrafine classification process, so that the process flow of the ultrafine high-activity steel slag powder can be operated circularly and continuously.
5) Ultra-fine high-activity steel slag powder activity test
Respectively weighing 5kg (serial number 3) of active steel slag powder with the specific surface area of 402 square meters per kilogram, which is obtained by the preparation; 5kg of superfine high-activity steel slag powder (serial number 4); a certain steel mill in Shandong accords with the national standard of steel slag powder used in cement and concrete, namely 5kg of GB/T20491 second-grade steel slag powder (serial number 2); the standard cement is 5kg (sequence number 1), and the standard cement is 42.5 grade common silicate cement produced by the Oncomelania Hupensis Gredler company. The samples of example 2 (No. 4), (No. 3), (No. 2) and (No. 1) were examined for compressive strength and activity index according to the method specified in the national Standard "Steel slag powder for use in Cement and concrete", GB/T20491, respectively. The test results are listed in table 2.
Table 2: test results of compressive strength and activity index of superfine high-activity steel slag powder and Shandong second-grade steel slag powder
According to the test results of the examples in table 1 and table 2, it can be seen that: the superfine high-activity steel slag powder prepared by the invention has an activity index of over 85 percent in 3 days, and is 1.55 times of the specified value of the activity index of the GB/T20491 secondary steel slag powder in 7 days, which is the steel slag powder used in cement and concrete in the national standard; the activity index can reach more than 95 percent in 28 days. The superfine high-activity steel slag powder and the 52.5-grade ordinary portland cement provided by the invention are compounded to improve the 42.5-grade steel slag portland cement to the 52.5-grade (see the test data of the serial number 4 in the table 1), and the technical and market blank that the state does not have the 52.5-grade steel slag portland cement can be filled.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (1)
1. A preparation method of superfine high-activity steel slag powder comprises the following steps:
1) the compressive strength activity index is more than or equal to 55 percent in 7 days, more than or equal to 65 percent in 28 days, and the specific surface area is more than or equal to 400m2The steel slag powder used for cement and concrete meets the national standard of steel slag powder, namely, the secondary steel slag powder of GB/T20491 is used as a raw material, the metal iron in the raw material is less than or equal to 0.5 percent through circular magnetic separation, meanwhile, low-activity and weak-magnetic residues mainly containing ferric oxide in the raw material are removed, the activity of the raw material of the steel slag powder obtained through the magnetic separation is improved, and the magnetic field intensity of the circular magnetic separation is more than or equal to 2500 GS;
2) sending the active steel slag powder with the metal iron content less than or equal to 0.5 percent obtained by the circular magnetic separation into a superfine classifier with the rotor linear speed of 100m per second for dry air separation classification, leading the average grain diameter to be less than or equal to 6.0 mu m and obtaining the specific surface area to be more than or equal to 850m2Per kg of superfine high-activity steel slag powder and active steel slag powder with the average grain diameter larger than 6 mu m;
3) introducing active steel slag powder with average grain diameter more than 6 μm into horizontal high-fine mill, and grinding to make its specific surface area more than or equal to 400m2The steel slag powder is returned to enter the circulating magnetic separation iron removal process of the step 1 together with a newly fed steel slag powder raw material, metal iron enriched in the steel slag powder and metal iron generated in the grinding process are removed after superfine air separation and classification, and then the steel slag powder is recycled to enter the step 2, so that superfine high-activity steel slag powder can be obtained, and the active steel slag powder with the average particle size of more than 6 mu m is recycled to enter a horizontal high-fine grinding machine to be researched into superfine powder;
the average grain diameter of the superfine high-activity steel slag powder is less than or equal to 6 mu m, and the specific surface area is more than or equal to 850m2Per kg, metal iron less than or equal to 0.5%, compressive strength activity indexNumber: more than or equal to 85 percent in 3 days and more than or equal to 95 percent in 28 days, and other technical indexes all meet the national standard of steel slag powder used in cement and concrete, namely the specified value in GB/T20491.
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| CN110181065B (en) * | 2019-04-22 | 2022-04-26 | 武汉科技大学 | Metallurgical slag water jet milling method |
| CN112010579A (en) * | 2020-09-08 | 2020-12-01 | 山东埃尔派粉体科技有限公司 | Production method of superfine steel slag powder |
| CN115180849A (en) * | 2022-06-22 | 2022-10-14 | 龙岩市全鸿建材有限公司 | Efficient and energy-saving preparation method of superfine steel slag powder |
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