CN112679118B - Steel slag micro powder with weak slow-setting characteristic and production method thereof - Google Patents
Steel slag micro powder with weak slow-setting characteristic and production method thereof Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 172
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 146
- 239000010959 steel Substances 0.000 title claims abstract description 146
- 239000000843 powder Substances 0.000 title claims abstract description 95
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000000227 grinding Methods 0.000 claims abstract description 28
- 238000007885 magnetic separation Methods 0.000 claims abstract description 16
- 238000003801 milling Methods 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 108
- 238000005086 pumping Methods 0.000 claims description 70
- 239000002994 raw material Substances 0.000 claims description 59
- 239000000428 dust Substances 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 11
- 238000012216 screening Methods 0.000 claims description 11
- 239000011362 coarse particle Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 238000010009 beating Methods 0.000 claims description 7
- 239000010419 fine particle Substances 0.000 claims description 5
- 230000000979 retarding effect Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 2
- 230000005284 excitation Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000004568 cement Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 7
- 238000009834 vaporization Methods 0.000 description 7
- 230000008016 vaporization Effects 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
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- 238000006467 substitution reaction Methods 0.000 description 3
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- 235000019738 Limestone Nutrition 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
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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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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention provides steel slag micro powder with weak slow setting property and a production method thereof, wherein the specific surface area of the steel slag micro powder is 300 +/-20 m 2 The grain size distribution is D10-8.49 μm, D50-22.59 μm, D90-42.60 μm and D99-60.69 μm. The production method mainly comprises the steps of hot disintegration treatment of steel slag, magnetic separation rod milling treatment and powder selection and milling treatment. The production method for producing the steel slag micro powder has the advantages of low production cost and large treatment capacity, and the production cost is 70 yuan/ton, and 66t/h of mill stand is needed in the grinding process.
Description
Technical Field
The invention relates to the technical field of converter steel slag application, in particular to steel slag micro powder with weak slow-setting property and a production method thereof.
Background
The converter steel slag is waste slag generated in steel making, accounts for about 12-13% of the steel yield, and the generation amount of the converter steel slag is increased along with the annual increase of the steel yield in China. The main application of converter steel slag is to produce steel casting billets which are extracted from the steel casting billets after being ground and applied to the cement and concrete industries.
When the converter steel slag is applied to the cement and concrete industries, the converter steel slag needs to be ground into powder of 400m 2 After being applied to a composite gelled system such as cement, concrete and the like after being subjected to kg, the setting time of the composite gelled material is greatly prolonged, the strength of the composite gelled material is reduced, however, the conventional converter steel slag has strong retardation property and can be used for water in the using processThe delayed coagulation time of the mud or the concrete is too long, so that the application of the converter steel slag in a composite gelling system is limited; in addition, in the process of grinding the converter steel slag, the steel slag contains a large amount of large-particle and compact-structure crystals, and the steel slag contains more elements such as calcium, magnesium, silicon and the like, so that the grinding difficulty of the steel slag is high, and the grinding cost is high, which is another important reason for limiting the application of the converter steel slag; the application of the converter steel slag is limited, so that the utilization rate of the steel slag is reduced, and the waste of the steel slag is caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides steel slag micro powder with weak retardation property and a production method thereof, wherein the specific surface area of the steel slag micro powder is 300 +/-20 m 2 The grain size distribution is D10-8.49 μm, D50-22.59 μm, D90-42.60 μm, and D99-60.69 μm; the production method mainly comprises the steps of hot stuffiness treatment of the steel slag, powder selection treatment and powder grinding treatment, wherein the hot stuffiness treatment is used for improving the steel slag pulverization effect, the powder selection treatment is used for screening fine powder, and the powder grinding treatment is used for emphatically grinding the metal solid solution in the steel slag, so that the production method is more reasonable. The production method for producing the steel slag micro powder has the advantages of low production cost and large treatment capacity, and the production cost is 70 yuan/ton, and 66t/h of mill stand is needed in the grinding process.
The technical scheme of the invention is as follows:
the steel slag micro powder with weak slow setting characteristic has a specific surface area of 300 +/-20 m 2 The grain size distribution is D10-8.49 μm, D50-22.59 μm, D90-42.60 μm and D99-60.69 μm.
The production method of the steel slag micro powder with the weak slow setting characteristic mainly comprises the steps of hot disintegration treatment of the steel slag, magnetic separation rod milling treatment and powder selection and milling treatment.
Preferably, the steel slag hot stuffiness treatment process adopts the echelonment cooling mode to the steel slag cooling, is about to the steel slag from the top to the bottom layer of cutting, cuts the layer and carries out the formula cooling progressively in proper order to the layer, as follows:
(1) primary water pumping: at 20m 3 The water pumping flow is per hour, and the water pumping is carried out for 30 min; basic principle of slowly cooling by pumping water at small flowThe method avoids the phenomenon of air blasting caused by instant vaporization and expansion of water easily generated when high-temperature steel slag is subjected to high-flow water blasting; after primary water pumping, the temperature of the steel slag is between 400 ℃ and 500 ℃;
(2) secondary water pumping: at 30m 3 The water pumping flow is per hour, and the water pumping is carried out for 60 min; after one-time water pumping, the surface temperature of the high-temperature steel slag is reduced, and the slag layer with the depth of 1.5-2m at the top layer can adapt to vaporization expansion caused by slightly increased water flow; the water is infiltrated into the steel slag by increasing the water fetching flow;
(3) and (3) water pumping for three times: the steel slag is settled after primary water pumping and secondary water pumping, and 10m is used for avoiding the influence of the fast temperature return of the bottom layer high-temperature steel slag on the subsequent water pumping process 3 The water pumping flow is/h, and the water pumping is carried out for 60 min; continuously pumping water into the steel slag at a small flow rate to maintain a certain temperature gradient between the top layer and the bottom layer of the steel slag; the sedimentation has the advantages that the thermal steel slag and water can have time to fully contact, the hot disintegrating effect of the steel slag is improved, meanwhile, the accumulated water at the bottom of the slag disintegrating pool can be discharged in time, and the safety of the hot disintegrating process is ensured;
(4) and (3) water fetching for four times: after three times of water pumping, the water is pumped at a rate of 40m 3 The water pumping flow is per hour, and the water pumping is carried out for 90 min; because the temperature gradient of the steel slag is stable in the three-time water-beating process, the steel slag can adapt to the large-flow water-beating in this time, and the rapid cooling and exciting of the steel slag are completed;
(5) circulating water pumping: at 10m 3 The flow rate of pumping water is 50m after 60min 3 The water pumping flow is/h, the water pumping is performed for 60min, the circulation is performed for at least 2 times, and the water pumping is finished;
after the four times of water pumping, the temperature of the steel slag on the upper layer is reduced to be in a cold slag state; the temperature of the steel slag with a 0.9-1.2m cut layer from the bottom to the top is still higher, in order to fully utilize the residual heat of the steel slag with the cut layer to promote the expansion and decomposition and improve the pulverization effect, a circulating water pumping process is adopted, and water (10 m) is pumped at a small flow rate 3 H) high flow rate water fetching (50 m) 3 The circulation mode of the/h) alternately pumps water to ensure that the steel slag is precipitated and cooled at the same time; in the process, water is pumped at a small flow rate, so that the temperature of the steel slag is prevented from being raised in the process of precipitation, and the steel slag is loweredThe temperature process is carried out in a gradient and uniform manner, so that the phenomenon that the steel slag is cooled and faulted due to instant vaporization and expansion of water is avoided, and further, the non-uniform sedimentation can be avoided;
(6) and (5) stewing for 60min after water pumping is finished to obtain stewed dregs.
In the steel slag hot disintegrating treatment process, the steel slag in the disintegrating slag pool is subjected to layer-type progressive cooling, so that a large amount of water vaporization expansion caused by overhigh temperature of deep steel slag can be effectively avoided, the steel slag disintegrating slag is prevented from being uneven, and large-particle metal solids in the disintegrating slag are reduced as much as possible.
Preferably, in the four water pumping processes in the step (4), the cooling and exciting depth of the steel slag is between 1.5 and 3.5 m.
In the present application, the depth of the steel slag is measured from the top layer of the steel slag to the bottom layer of the steel slag.
Preferably, in the magnetic separation rod mill treatment, after primary magnetic separation treatment, rod mill treatment and secondary magnetic separation treatment are carried out on the stuffy slag, slag particles with the particle size of less than or equal to 10mm and the content of metal iron of less than or equal to 2 percent are obtained, and the slag particles are the raw materials for producing the steel slag micro powder with the weak slow-setting characteristic; the raw material comprises a silicate phase and an RO phase, wherein the RO phase is a mineral with the highest density and hardness in the steel slag; when the steel slag micro powder is applied to cement and concrete, the main factor influencing the retarding effect is a silicate phase, and the particle size of the silicate phase determines the dissolution rate of retarding substances; the RO phase exists as a raw material constituting cement and concrete on the one hand, and Fe as a main component of the RO phase on the other hand 2 O 3 And the main components of the silicate phase are tricalcium silicate and dicalcium silicate, and the RO phase and the silicate phase are fused to form the steel slag when the steel slag is formed in the converter.
Preferably, the powder selecting and grinding treatment comprises the following steps: screening the raw materials by using a powder concentrator, controlling the rotating speed of the powder concentrator to be 130rpm, dividing the screened raw materials into a raw material I and a raw material II, wherein the raw material I is a fine particle raw material, enters a dust collector along with gas, is collected by the dust collector, and is conveyed to a finished product bin for storage; the raw material II is coarse particle raw material, enters a horizontal roller mill, is ground and then enters a powder concentrator for screening, the fine particle part enters a dust collector, the coarse particle part enters the horizontal roller mill, and continues to enterGrinding and selecting powder until the raw materials are ground, so as to obtain steel slag micro powder; the specific surface area of the steel slag micro powder is 300 +/-20 m 2 Per kg, 45 mu m screen residue is more than or equal to 5 percent.
Preferably, the production system used in the powder selecting and grinding treatment process comprises a powder selecting machine, a horizontal roller mill, a dust collector and an exhaust fan;
the powder concentrator comprises an outlet I and an outlet II, wherein the outlet I is connected with an inlet of the dust collector, and the outlet II is connected with an inlet of the horizontal roller mill; screening the outlet I to obtain a raw material I; screening the outlet II to obtain a raw material II;
the outlet of the horizontal roller mill is connected with the inlet of the powder concentrator;
the dust collector is provided with a gas outlet and a discharge opening, the gas outlet is connected with an exhaust fan, and the discharge opening is connected with a finished product bin.
Preferably, the rotating speed of the exhaust fan is 915rpm, and the grinding pressure of the horizontal roller mill is 170 bar.
Preferably, in order to improve the screening effect of the powder concentrator on the raw materials, a flash dryer is installed between the raw material bin and the powder concentrator, the flash dryer provides heat through a hot blast stove and dries the raw materials, and the dried raw materials enter the powder concentrator to be separated into a raw material I and a raw material II.
Preferably, a buffer bin is arranged between the outlet II of the powder concentrator and the inlet of the horizontal roller mill, and an electronic belt scale is arranged between the buffer bin and the inlet of the horizontal roller mill and used for controlling the quality of the raw material II entering the horizontal roller mill.
Preferably, a conveying chute is arranged between the dust collector and the finished product bin; the exhaust fan is connected with a smoke exhaust tube.
Preferably, two horizontal roller mills are arranged; the dust collector is a bag type dust collector.
During the powder selecting and grinding process, the used horizontal roller mill has the characteristic of small cylinder size, when the raw material subjected to the magnetic separation rod milling process is milled, a silicate phase with qualified particle size distribution is selected through the powder selecting machine, the horizontal roller mill mills the RO phase and the unqualified silicate phase, and the particle size distribution of the steel slag micro powder is qualified through the cyclic process of milling and powder selecting and by controlling the milling pressure, the rotating speed of the exhaust fan and the rotating speed of the powder selecting machine in the milling process.
Compared with the prior art, the invention has the beneficial effects that:
1. in the hot disintegrating treatment process of the steel slag, the water beating flow and the water beating time are controlled, so that the steel slag in the disintegrating slag pool is cooled progressively from top to bottom, the phenomenon that the water is vaporized and expanded instantly to cause the temperature reduction fault of the steel slag is avoided, the non-uniform sedimentation can be avoided, and the steel slag is thoroughly digested.
2. In the magnetic separation rod mill processing procedure, carry out preliminary treatment to vexed sediment, through a magnetic separation, reduce rod mill equipment such as metal and produce the damage, through secondary magnetic separation, avoid slag miropowder raw materials to produce the damage to subsequent equipment.
3. In the powder selecting and grinding treatment process, a powder selecting machine is adopted to primarily screen the steel slag micro-powder raw material, so that the horizontal roller mill mainly grinds the metal solid solution, the ineffective work of the horizontal roller mill is avoided, and the treatment efficiency of the steel slag is improved; through the charging and utilization of the horizontal roller mill and the powder concentrator, the utilization rate of equipment is improved, the excessive investment of the equipment and the idle waste of the equipment are reduced, and the production cost is reduced.
4. In the production method provided by the invention, through the effective combination of hot stuffiness treatment of the steel slag, magnetic separation rod milling treatment and powder selection and grinding treatment, the production cost is saved, the treatment efficiency of the steel slag is improved, the production cost is 70 yuan/ton, and the mill time is 66t/h in the grinding process; the specific surface area of the obtained steel slag micro powder is 300 +/-20 m 2 The grain size distribution is D10-8.49 μm, D50-22.59 μm, D90-42.60 μm and D99-60.69 μm.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a diagram of a powder selecting and grinding process.
In the figure, 1-raw material bin, 2-powder concentrator, 201-outlet I, 202-outlet II, 3-flash dryer, 4-hot blast stove, 5-dust collector, 6-finished product bin, 7-buffer bin, 8-horizontal roller mill, 9-electronic belt scale, 10-exhaust fan, 11-smoke exhaust cylinder and 12-conveying chute.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, 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.
Example 1
A production method of steel slag micro powder with weak slow-setting characteristics comprises the following specific processes:
transporting the steel slag to a slag disintegrating pool by using a flat car, and digesting the steel slag in the slag disintegrating pool, wherein the concrete process is as follows:
the steel slag is cooled by adopting a stepped cooling mode, namely, the steel slag is cut into layers from the top to the bottom, and the cut layers are sequentially and progressively cooled as follows:
(1) primary water pumping: at 20m 3 The water pumping flow is per hour, and the water pumping is carried out for 30 min; the water is beaten according to the basic principle of slow cooling with small flow, so that the phenomenon of air blasting caused by instant vaporization and expansion of water easily generated when high-temperature steel slag is beaten with large flow is avoided; after primary water pumping, the temperature of the steel slag is between 400 ℃ and 500 ℃;
(2) secondary water pumping: at 30m 3 The water pumping flow is per hour, and the water pumping is carried out for 60 min; after one-time water pumping, the surface temperature of the high-temperature steel slag is reduced, and the slag layer with the depth of 1.5-2m at the top layer can adapt to vaporization expansion caused by slightly increased water flow; water is infiltrated into the steel slag by increasing the water fetching flow;
(3) and (3) water pumping for three times: the steel slag is settled after primary water pumping and secondary water pumping, and 10m is used for avoiding the influence of the fast temperature return of the bottom layer high-temperature steel slag on the subsequent water pumping process 3 The flow rate of the water fetching is/h,pumping water for 60 min; continuously pumping water into the steel slag at a small flow rate to maintain a certain temperature gradient between the top layer and the bottom layer of the steel slag;
(4) and (3) water fetching for four times: after three times of water pumping, the water is pumped at the speed of 40m 3 The water pumping flow is/h, and the water pumping is carried out for 90 min; because the temperature gradient of the steel slag is stable in the three-time water-beating process, the steel slag can adapt to the large-flow water-beating in this time, and the rapid cooling and exciting of the steel slag are completed; the cooling and exciting depth of the steel slag is between 1.5 and 3.5 m;
(5) circulating water pumping: at 10m 3 The flow rate of pumping water is 50m after 60min 3 The water pumping flow is/h, the water pumping is performed for 60min, the circulation is performed for at least 2 times, and the water pumping is finished;
after four times of water pumping, the temperature of the steel slag on the upper layer is reduced to be in a cold slag state; the temperature of the steel slag with a cut layer of 0.9-1.2m from the bottom to the top is still higher, in order to fully utilize the residual heat of the steel slag with the cut layer to promote the expansion and decomposition and improve the pulverization effect, a circulating water pumping process is adopted, and water (10 m) is pumped at a small flow rate 3 H) high flow rate water fetching (50 m) 3 The circulation mode of the/h) alternately pumps water to ensure that the steel slag is precipitated and cooled at the same time; in the process, water is pumped at a small flow rate, so that the temperature return of the steel slag in the process of precipitation is avoided, the temperature reduction process of the steel slag is carried out in a gradient and uniform manner, the instant vaporization and expansion of water are avoided, the temperature reduction fault of the steel slag is caused, and the non-uniform precipitation can be avoided;
(6) after the water is pumped, stewing the slag for 60min to obtain stewed slag;
carrying out primary magnetic separation treatment, rod mill treatment and secondary magnetic separation treatment on the obtained disintegrating slag to obtain slag particles with the particle size of less than or equal to 10mm and the content of metal iron of less than or equal to 2 percent, wherein the slag particles are the raw materials for producing the steel slag micro powder with the weak slow-setting property and are sent into a raw material bin for later use;
the method comprises the following steps of (1) carrying out powder selection and grinding treatment on raw materials, wherein the specific process is as follows:
with reference to fig. 1, raw materials subjected to magnetic separation rod milling are conveyed into a powder concentrator 2 from a raw material bin 1, the raw materials are dried by a flash dryer 3 before entering the powder concentrator 2, and hot air of the flash dryer 3 is provided by a hot air furnace 4;
the dried raw materials enter a powder concentrator 2, and the rotating speed of the powder concentrator 2 is 130 rpm;
the powder concentrator 2 comprises an outlet I201 and an outlet II 202, and the outlet I201 is screened to obtain a raw material I; screening at an outlet II 202 to obtain a raw material II; the raw material I is a fine particle raw material, and the raw material II is a coarse particle raw material;
an outlet I201 of the powder concentrator 2 is connected with an inlet of the dust collector 5;
the raw material I enters a dust collector 5 along with gas;
an outlet II 202 of the powder concentrator 2 is connected with a buffer bin 7, and the buffer bin 7 is connected with an inlet of the horizontal roller mill 8; an electronic belt scale 9 is arranged between the buffer bin 7 and the inlet of the horizontal roller mill 8 and is used for controlling the quality of the raw material II entering the horizontal roller mill 8; controlling the amount of the raw material II entering the horizontal roller mill 8 to be 66 t/h;
the outlet of the horizontal roller mill 8 is connected with the inlet of the powder concentrator 2; the grinding pressure of the horizontal roller mill 8 is 170 bar;
the dust collector 5 is provided with a gas outlet and a discharge opening,
the gas outlet is connected with an exhaust fan 10, and the exhaust fan 10 is connected with a smoke exhaust tube 11; the rotating speed of the exhaust fan 10 is 915 rpm;
the discharge opening is connected with the finished product bin 6 through a conveying chute 12;
two horizontal roller mills 8 are arranged; the dust collector 5 is a bag type dust collector 5;
grinding the raw material II by the horizontal roller mill 8, then separating the raw material II in the powder concentrator 2, feeding fine powder into the dust collector 5 through an outlet I201 of the powder concentrator 2, feeding coarse particles into the horizontal roller mill 8 through an outlet II 202 for continuous grinding, and repeating the process to obtain steel slag micro powder; the specific surface area of the steel slag micro powder is 300 +/-20 m2/kg, the 45 mu m screen residue is more than or equal to 5%, and the particle size distribution is that D10 is 8.49 mu m, D50 is 22.59 mu m, D90 is 42.60 mu m, and D99 is 60.69 mu m.
Experimental example 1
The following experiment was carried out using the steel slag micropowder obtained in example 1:
1. according to the standard cement: the steel slag micro powder is measured according to the proportion of 70:30, the activity index of the steel slag micro powder is 56% in 3 days, 63% in 7 days and 73% in 28 days;
2. according to the cement clinker: limestone: gypsum: slag powder: preparing a composite cementing material from 58.8:5.6:5.6:15:15 steel slag micro powder, wherein the initial setting is 163min, and the final setting is 245 min; the autoclave expansion rate is 0.19 percent; the 1-day compressive strength is 9.3MPa, the 3-day compressive strength is 26MPa, and the 28-day compressive strength is 47 MPa;
3. according to the water: cement: steel slag micro powder: slag micropowder: sand: the C30 concrete is prepared from stone 170:240:52:108:860:1005, the initial slump is 190mm, the compression resistance is 28MPa in 7 days, and the compression strength is 39MPa in 28 days.
Comparative example 1
The contrast production method comprises the following steps:
the preparation method of the steel slag powder is different from the embodiment 1 in that the rotating speed of the powder concentrator is 175rpm, the rotating speed of the exhaust fan is 750rpm, and the grinding pressure is 185 bar; the amount of the raw material II entering the horizontal roller mill is controlled to be 40t/h, and the production cost is 80 yuan/ton;
the specific surface area of the steel slag powder is 410 +/-20 m 2 Kg, 45 mu m screen residue is less than or equal to 1 percent;
1. according to the standard cement: the activity index of the steel slag powder is measured according to the proportion of 70:30, wherein the activity index in 3 days is 41%, the activity index in 7 days is 58% and the activity index in 28 days is 70%;
2. according to the cement clinker: limestone: gypsum: slag powder: preparing a composite cementing material from 58.8:5.6:5.6:15:15 steel slag powder, wherein the initial setting is 223min, and the final setting is 371 min; the autoclave expansion rate is 0.22 percent; the 1-day compressive strength is 7.3MPa, the 3-day compressive strength is 24MPa, and the 28-day compressive strength is 49 MPa;
3. according to the water: cement: steel slag powder: slag: sand: the C30 concrete is prepared from stone 170:240:52: 860:1005, the initial slump is 170mm, the compression resistance is 24MPa in 7 days, and the compression strength is 35MPa in 28 days.
It can be seen from the application of the steel slag micropowder in the experimental example 1 and the comparative example 1 that the delayed coagulation property of the steel slag micropowder can be reduced by controlling the granularity of the steel slag micropowder on the basis of balancing the activity index, the slurry coagulation time and the strength of the steel slag micropowder, therefore, in the invention, the granularity of the steel slag micropowder is further controlled by designing the rotating speed of the powder concentrator, the grinding pressure of the horizontal roller mill and the rotating speed of the exhaust fan on the premise of ensuring that the steel slag micropowder has a certain specific surface area, and the experimental example 1 can show that when the steel slag micropowder is used in cement and concrete, the performance of the cement and concrete is effectively improved, and the additional value and the application range of the steel slag are improved.
According to the annual weak retardation characteristic, 40 ten thousand tons of steel slag micro powder are produced, the cost of each ton is reduced by 10 yuan, and the annual benefit is calculated to be 400 ten thousand yuan.
Although the present invention has been described in detail by referring to the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A production method of steel slag micro powder with weak slow setting characteristic is characterized by mainly comprising hot disintegration treatment of steel slag, magnetic separation rod milling treatment and powder selection and grinding treatment;
the steel slag hot-disintegration treatment process comprises the following steps:
(1) primary water pumping: at 20m 3 The water pumping flow is/h, and the water pumping is carried out for 30 min; after primary water pumping, the temperature of the steel slag is between 400 and 500 ℃;
(2) secondary water pumping: at 30m 3 The water pumping flow is per hour, and the water pumping is carried out for 60 min;
(3) and (3) water pumping for three times: at 10m 3 The water pumping flow is per hour, and the water pumping is carried out for 60 min;
(4) and (3) water fetching for four times: after three times of water pumping, the water is pumped at a rate of 40m 3 The water pumping flow is per hour, and the water pumping is carried out for 90 min;
(5) circulating water pumping: at 10m 3 The flow rate of pumping water is 50m after 60min 3 The water pumping flow is/h, the water pumping is performed for 60min, the circulation is performed for at least 2 times, and the water pumping is finished;
(6) after the water is pumped, stewing the slag for 60min to obtain stewed slag;
the specific surface area of the steel slag micro powder is 300 +/-20 m 2 The grain size distribution is D10-8.49 μm, D50-22.59 μm, D90-42.60 μm and D99-60.69 μm.
2. The method for producing steel slag micropowder with a low retardation property as claimed in claim 1, wherein the depth of the steel slag cooling and excitation is 1.5-3.5m in the four water-beating processes of step (4).
3. The method for producing steel slag micropowder with low retardation characteristics as claimed in claim 1, wherein in the magnetic rod milling treatment, the disintegrating slag is subjected to a primary magnetic separation treatment, a rod mill treatment and a secondary magnetic separation treatment, thereby obtaining slag particles with a particle size of 10mm or less and a metallic iron content of 2% or less, and the slag particles are the raw material for producing the steel slag micropowder with low retardation characteristics.
4. The method for producing steel slag micropowder with weak retardation characteristics according to claim 1, wherein the powder selection and grinding treatment comprises the following steps: screening the raw materials by using a powder concentrator, controlling the rotating speed of the powder concentrator to be 130rpm, dividing the screened raw materials into a raw material I and a raw material II, wherein the raw material I is a fine particle raw material, enters a dust collector along with gas, is collected by the dust collector, and is conveyed to a finished product bin for storage; the raw material II is coarse particle raw material, the coarse particle raw material enters a horizontal roller mill, the coarse particle raw material is ground and then enters a powder concentrator for screening, the fine particle part enters a dust collector, the coarse particle part enters the horizontal roller mill, the grinding and powder concentration treatment are continuously carried out until the grinding of the raw material is finished, and the steel slag micro powder is obtained; the specific surface area of the steel slag micro powder is 300 +/-20 m 2 Per kg, 45 mu m screen residue is more than or equal to 5 percent.
5. The method for producing steel slag micropowder with a weak set-retarding property according to claim 4, wherein the production system used in the process of powder selection and grinding comprises a powder selector, a horizontal roller mill, a dust collector and an exhaust fan;
the powder concentrator comprises an outlet I and an outlet II, wherein the outlet I is connected with an inlet of the dust collector, and the outlet II is connected with an inlet of the horizontal roller mill; screening the outlet I to obtain a raw material I; screening the outlet II to obtain a raw material II;
the outlet of the horizontal roller mill is connected with the inlet of the powder concentrator;
the dust collector is provided with a gas outlet and a discharge opening, the gas outlet is connected with an exhaust fan, and the discharge opening is connected with a finished product bin.
6. The method for producing steel slag micropowder having a low retarding property of claim 5, wherein the rotation speed of the exhaust fan is 915rpm and the grinding pressure of the horizontal roller mill is 170 bar.
7. A production method of steel slag micropowder with a low retardation property as claimed in claim 5, wherein a flash dryer is installed between the raw material bin and the powder concentrator, and the flash dryer is connected with a hot blast stove.
8. The production method of the steel slag micropowder with the weak retarding property of claim 5, wherein a buffer bin is arranged between the outlet II of the powder concentrator and the inlet of the horizontal roller mill, and an electronic belt scale is arranged between the buffer bin and the inlet of the horizontal roller mill.
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Denomination of invention: A weakly retarder steel slag micro powder and its production method Effective date of registration: 20231215 Granted publication date: 20220823 Pledgee: Rizhao Bank Co.,Ltd. Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2023980072204 |
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