AU2020101464A4 - A Method for Stage Grinding of Steel Slag-Industrial By-Product Gypsum Composite Powder - Google Patents
A Method for Stage Grinding of Steel Slag-Industrial By-Product Gypsum Composite Powder Download PDFInfo
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- AU2020101464A4 AU2020101464A4 AU2020101464A AU2020101464A AU2020101464A4 AU 2020101464 A4 AU2020101464 A4 AU 2020101464A4 AU 2020101464 A AU2020101464 A AU 2020101464A AU 2020101464 A AU2020101464 A AU 2020101464A AU 2020101464 A4 AU2020101464 A4 AU 2020101464A4
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- iron
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 136
- 239000010959 steel Substances 0.000 title claims abstract description 136
- 238000000227 grinding Methods 0.000 title claims abstract description 74
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 69
- 239000010440 gypsum Substances 0.000 title claims abstract description 69
- 239000000843 powder Substances 0.000 title claims abstract description 63
- 239000006227 byproduct Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 159
- 239000002893 slag Substances 0.000 claims abstract description 103
- 229910052742 iron Inorganic materials 0.000 claims abstract description 80
- 239000002245 particle Substances 0.000 claims abstract description 80
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 239000012141 concentrate Substances 0.000 claims description 12
- 238000005242 forging Methods 0.000 claims description 12
- 229910001341 Crude steel Inorganic materials 0.000 claims description 6
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 4
- 244000248349 Citrus limon Species 0.000 claims description 3
- 235000005979 Citrus limon Nutrition 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 238000005054 agglomeration Methods 0.000 abstract description 4
- 230000002776 aggregation Effects 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000006148 magnetic separator Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000638 stimulation Effects 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
- B02C23/22—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating with recirculation of material to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
- B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/007—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls specially adapted for disintegrating refuse
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2/00—Crushing or disintegrating by gyratory or cone crushers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/55—Slag
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/35—Shredding, crushing or cutting
Abstract
The present invention discloses a method for stage grinding of steel slag-industrial by-product
gypsum composite powder, which is operated as following steps: remove iron in advance to
remove large-particle metallic iron from steel slag block, so as to prevent large-particle iron from
entering crusher and thus affecting crushing efficiency; combine two stages of crushing with
separation and iron removal, so as to prevent a large number of iron from entering into tube mill
and thus increasing the circulating load of tube mill due to the poor grinding property of metallic
iron; mix the industrial by-product gypsum with steel slag and grind in the secondary grinding,
so as to avoid the situation of easy adhesion to equipment, easy over-grinding and easy
agglomeration when separately grinding the industrial by-product gypsum and to obtain steel
slag-industrial by-product gypsum composite powder with low iron content, high specific
surface area and low moisture content through effective mixture of materials, which promotes
the synergistic utilization of steel slag and industrial by-product gypsum as industrial solid
waste.
Drawing of Description
SuqmdeLddze p ~ tm- u slag
podu&t y- Rollerl press !
DvwHot-blas stov
gh eicie Crde steel Dysimic V-typw pwder
%bconcentrator concentrator
loop iro Plt udie ps
telslag-deslfize tube PlateM ..idized ...........
gypsum compote ilae
Figure 1
Description
Drawing of Description
SuqmdeLddze p ~ tm- u slag
podu&t y- Rollerl press
! DvwHot-blas stov
gh eicie Crde steel Dysimic V-typw pwder
%bconcentrator concentrator
loop iro Plt udie ps
telslag-deslfize tube PlateM ..idized ........... gypsum compote ilae
Figure 1
Description
A Method for Stage Grinding of Steel Slag-Industrial By-Product Gypsum Composite Powder
Technical Field The present invention relates to the technical field of comprehensive utilization of industrial solid waste, in particular to a method for stage grinding of steel slag-industrial by-product gypsum composite powder.
Technical Background Steel slag can be used in concrete, cement, and water-stable layer in highway construction, etc. The utilization of steel slag is confronted with technical barrier: due to high iron content in steel slag, the single grinding method is not only difficult to achieve the required particle size, but also has great energy consumption of grinding. The comprehensive utilization of iron removal and stage grinding can not only reduce the energy consumption, but also obtain fine steel slag powder.
The composition of industrial by-product gypsum is consistent with that of natural gypsum, namely calcium sulfate dihydrate. Owing to a large number of sulfate radical groups contained, it can play a role of sulfate stimulation on silicate-oxygen tetrahedron with hydrohard activity in slag to form alumite minerals, contributing to the strength of hydrated paste. However, due to its high moisture content and easy adhesion to powder equipment, it is urgent to seek an effective grinding method.
In the comprehensive utilization of steel slag, compounding steel slag-industrial by-product gypsum and slag with stage-grinding to get high-performance cement or concrete is an effective method for great utilization of steel slag. However, this method requires a certain fineness of steel slag to give full play to its role as an alkaline exciter, and single stage-grinded cementitious material of steel slag-industrial by-product gypsum has not been reported.
The patent (CN107159426A) discloses a secondary iron selection method for steel slag through vibrating sieve - jaw crusher - primary roller magnetic separator and vibrating sieve jaw crusher - secondary roller magnetic separator and crushing roller mill - spiral magnetic separator and dry ball mill, so as to obtain granulated iron powder with 60% of total iron grade, which ensures the low iron content of steel slag in the ball milling process, effectively reduces the power consumption of grinding, and reduces the load and loss of ball mill. This patent is beneficial to the recovery and utilization of iron resources in steel slag, but neglects the composite utilization of steel slag. It is difficult to make comprehensive use of steel slag powder after iron removal due to large particle size, and the steel slag lost in the crushing process is
Description excessive due to high iron content. At the same time, it also neglects the comprehensive utilization of steel slag-industrial by-product gypsum.
The patent (CN107986643A) discloses a kind of stage-grinded admixture using gypsum to stimulate of steel slag and slag powder and a kind of high performance concrete using stage-grinded admixture. By using gypsum to stimulate the activity of steel slag, as well as the mutual stimulation between steel slag and slag powder, the activity of the mixture of steel slag and slag powder is improved, and the high activity admixture is used to replace part of cement stage-grinded concrete. However, this patient neglects the comprehensive utilization of steel slag-industrial by-product gypsum, and does not take into account the influence of grinding process of raw materials.
Invention Summary The present invention aims at solving at least one of the above technical problems in the existing technologies.
Therefore, one purpose of the present invention is to propose a method for stage grinding of steel slag-industrial by-product gypsum composite powder to solve the problems of high iron content and difficult grinding of steel slag, as well as the problems of easy adhesion to grinding equipment, easy over-grinding and easy agglomeration of industrial by-product gypsum during single grinding.
In order to achieve the above purposes, the present invention adopts the following technical scheme: a method for stage grinding of steel slag-industrial by-product gypsum composite powder, comprising the following steps:
(1) Pre-iron removal: use a suspended iron remover for pre-iron removal after feeding and weighing steel slag block;
(2) Primary closed-loop crushing, separation and iron removal: separate steel slag block after pre-iron removal through a square sieve, perform primary crushing of oversize steel slag block in a crusher, and then after primary crushing, separate through a suspended iron remover and a vibrating square sieve, thus forming a primary closed-loop; remove iron from undersize steel slag by plate fluidized iron remover to obtain pre-crushed steel slag particles;
(3) Secondary closed-loop crushing, powder concentration and iron removal: perform secondary crushing of pre-crushed steel slag particles obtained from Step (2) in a roller press, concentrate powder of secondary-crushed steel slag particles in a powder concentrator to obtain the finest particles and crudest particles; secondarily concentrate powder of the described finest particles in a dynamic powder concentrator to obtain the second finest particles and second crudest particles; mix the described crudest particles with the described second crudest particles, remove iron through the plate fluidized iron remover, then return secondary crushing after iron
Description removal, thus forming a secondary closed-loop; and the described second finest particles form crude steel slag particles;
(4) Primary closed-loop grinding, powder concentration and iron removal: concentrate powder of crude steel slag particles formed from Step (3) to obtain the third finest particles and third crudest particles; perform primary grinding of the described third crudest particles in a primary tube mill, then remove iron through the plate fluidized iron remover, after that return for powder concentration and primary grinding again after iron removal, thus forming a tertiary closed-loop and finally obtaining the third finest particles;
(5) Drying of industrial by-product gypsum: dry industrial by-product gypsum in a dryer;
(6) Secondary open-loop mixed grinding and iron removal: mix 50%-80% of the described third finest particles obtained from Step (4) and 20%-50% of the described dried industrial by-product gypsum simultaneously in a secondary tube mill for secondary mixed grinding, finally forming steel slag-industrial by-product gypsum composite powder.
According to the above technical scheme, compared with the existing technologies, the present invention discloses a method for stage grinding of steel slag-industrial by-product gypsum composite powder, which is operated as following steps: remove iron in advance to remove large-particle metallic iron from steel slag block, so as to prevent large-particle iron from entering crusher and thus affecting crushing efficiency; combine two stages of crushing with separation and iron removal, so as to prevent a large number of iron from entering into tube mill and thus increasing the circulating load of tube mill due to the poor grinding property of metallic iron; mix the industrial by-product gypsum with steel slag and grind during the secondary grinding, so as to avoid the situation of easy adhesion to equipment, easy over-grinding and easy agglomeration when separately grinding the industrial by-product gypsum and to obtain steel slag-industrial by-product gypsum composite powder with low iron content, high specific surface area and low moisture content through effective mixture of materials, reducing energy consumption in steel slag treatment (comprehensive electricity consumption < 50 kW-h/t) and improving the utilization value of steel slag, which is beneficial to the synergistic utilization of steel slag and industrial by-product gypsum as industrial solid waste.
Preferably, the particle size of the described oversize steel slag block in Step (2) is greater than 22 mm, and the particle size of the described undersize pre-crushed steel slag is 18 - 22 mm. Steel slag block with particle size of more than 22 mm is screened out through vibrating square sieve to continue iron removal and crushing, which ensures the maximum crushing of steel slag block and optimizes the crushing effect. At the same time, the pre-crushed steel slag with particle size of 18 - 22 mm is separated under sieve, which reduces the subsequent load on roller press and tube mill.
Description Preferably, Step (3) is operated specifically as followed: perform secondary crushing of pre-crushed steel slag particles in a roller press, then concentrate powder of secondary-crushed steel slag particles in a V-type powder concentrator driven by hot air from a hot-blast stove to obtain the finest particles and crudest particles.
Two-stage crushing is used: steel slag is crushed by cone crusher in the first stage and crushed by roller press in the second stage, which accords with the theory of "more crushing and less grinding", and the steel slag is fully crushed before grinding, which avoids increasing the load of tube mill after large-particle steel slag enters into tube mill and thus affecting the grinding effect. After two-stage crushing, steel slag powder is concentrated in a V-type powder concentrator driven by hot air from a hot-blast stove. The driving by hot air can, on the one hand, allow the drying of crushed steel slag, and on the other hand, blow steel slag to the V-type powder concentrator for powder concentration with the best strength due to strong blowing ability of hot air.
Preferably, the described steel slag-industrial by-product gypsum composite powder in Step (6) has a specific surface area of 420 - 450 m 2/kg, an iron content of 0.2% - 0.5%, and a water content of less than 0.5%.
Preferably, the primary tube mill is 7 - 14.5 min length and 2 - 4.6 min diameter, and has 2 - 3 chambers; the grinding medium of the primary tube mill is steel forging, and the diameter of the steel forging is 20 - 80 mm.
Preferably, the secondary tube mill is 7 - 14.5 min length and 2 - 4.6 min diameter, and has 2 - 3 chambers; the grinding medium of the described secondary tube mill is steel ball or fine steel forging, and the diameter of the described steel ball or fine steel forging is 10 - 20 mm.
Adding grinding medium (steel forging or steel ball) to tube mill and increasing filling amount of steel forging or steel ball are beneficial to prolong the retention time of gel material between grinding medium and provide more obvious grinding and homogenization effects.
Preferably, the described steel slag is one of converter steel slag (hot splashing steel slag, hot braised steel slag, roller steel slag, etc.)or electric stove slag; the described industrial by-product gypsum is one or more of desulfurized gypsum, phosphogypsum, fluorogypsum, lemon gypsum and waste pottery gypsum.
The present invention realizes the following benefits: (1) the present invention adopts four iron removal steps for steel slag, including iron removal in advance, iron removal by primary crushing, iron removal by secondary crushing and iron removal by primary tube grinding, and metallic iron that affects the grindability of steel slag is effectively removed, which conforms to the idea of "stage grinding + stage separation" and "removal as early as possible ", and solves the problems of hard grinding of steel slag and high iron content.
Description (2) Secondary mixed grinding of steel slag and industrial by-product gypsum can solve the problems of easy adhesion to grinding equipment, easy over-grinding and easy agglomeration of industrial by-product gypsum during single grinding.
Description of Drawings In order to illustrate the technical scheme in the embodiment of the present invention or the existing technologies more clearly, a brief description of the figure to be used in the embodiment or the existing technologies is given below. Obviously, the figure in the following description is only one embodiment of the present invention. For ordinary technicians in the field, other figures may be obtained on the basis of the figure provided without making any creative labor.
Figure 1 shows flow diagram of a method for stage grinding of steel slag-industrial by-product gypsum composite powder provided by the present invention.
Detailed Description of the Presently Embodiments The technical scheme in the embodiment of the present invention will be clearly and completely described in combination with the figure in the embodiment of the present invention. It is clear that the described embodiment is only a part of embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative labor are within the scope of protection of the present invention.
The present invention provides a method for stage grinding of steel slag-industrial by-product gypsum composite powder using iron removal in advance, two-stage crushing and two-stage grinding to realize the grinding of steel slag and industrial by-product gypsum, so as to achieve the synergistic utilization of steel slag and industrial by-product gypsum as industrial solid waste. The detailed description of the presently preferred embodiment is as follows:
First, remove iron in advance from steel slag block with a maximum particle size of about 100 mm by a suspended iron remover after feeding and weighing, so as to prevent a large amount of steel slag block entering a tube mill and extra load brought to the tube mill due to the poor grinding property of metallic iron.
Secondly, after pre-iron removal, separate steel slag block by vibrating square sieve with a side length of sieve hole of 2 mm, perform primary crushing of oversize steel slag block with a particle size of more than 22 mm in a cone crusher, then remove iron again through the suspended iron remover, and separate by vibrating square sieve after iron removal to form a primary closed-loop; remove iron from undersize steel slag with a particle size of 18 - 22 mm through a plate fluidized iron remover to form pre-crushed steel slag particles with a particle size of 22 mm, perform secondary crushing of pre-crushed steel slag particles in a roller press, and then concentrate powder in a V-type powder concentrator driven by hot air from a hot-blast stove
Description to form the finest particles and crudest particles; concentrate powder of the finest particles in a dynamic powder concentrator to produce second finest particles with a specific surface area of 320 m2/kg and second crudest particles with a specific surface area of less than or equal to 320 m2/kg; mix the second crudest particles with the crudest particles and then remove iron through the plate fluidized iron remover, and then return to the roller press for continuous crushing to form the second closed-loop; the second finest particles form crude steel slag particles.
Then, concentrate powder of the crude steel slag particles in a high-efficiency powder concentrator to form the third finest particles with a specific surface area of 400 m 2/kg and third crudest particles with a specific surface area of less than or equal to 400 m 2/kg; grind the third crudest particles in a primary tube mill with a length of 9 m, a diameter of 3.8 m, 2 chambers and a grinding medium of steel forging with a diameter of 20 mm, remove iron through the plate fluidized iron remover after grinding in primary tube mill, continuously concentrate powder of iron-removed steel slag particles in the high-efficiency powder concentrator, and then perform primary grinding to form a tertiary closed-loop and finally form the third finest particles with a specific surface area of 420 m2/kg.
At the same time, dry the industrial by-product gypsum in a dryer. The water content of dried industrial by-product gypsum is 0.3%.
Finally, mix 50% - 80% of the third finest particles with a specific surface area of 420 m2/kg with 20% - 50% of dried industrial by-product gypsum in the secondary tube mill with a length of 9 m, a diameter of 3.8 m, 2 chambers, and grinding mediums of steel forging and steel ball with a diameter of 10 mm for secondary mixed grinding. Mix the third finest particles with dried industrial by-product gypsum in the secondary tube mill for secondary mixed grinding to eventually obtain steel slag-the industrial by-product gypsum composite powder with a specific surface area of 520 m 2/kg, an iron content of 0.2% and a moisture content of 0.3%. The mixed grinding of industrial by-product gypsum and steel slag not only avoids the problem of easy adhesion to powder equipment during single grinding of industrial by-product gypsum, but also carrys out the effective pre-mixing of materials.
In this embodiment, the described steel slag is one of converter steel slag (hot splashing steel slag, hot braised steel slag, roller steel slag, etc.) or electric stove slag; the described industrial by-product gypsum is one or more of desulfurized gypsum, phosphogypsum, fluorogypsum, lemon gypsum and waste pottery gypsum.
Each embodiment in the specifications is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, which are referred to each other in the same similar parts. For the device disclosed in the embodiment, the description is relatively simple because it corresponds to the method disclosed in the embodiment, as described in the Methods section.
Description The above description of the disclosed embodiment enables the professional technicians in the field to realize or use the present invention. Multiple modifications to these embodiments will be obvious to professional technicians in the field, and the general principles defined in this document can be implemented in other embodiments without leaving the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this document, but should conform to the widest range consistent with the principles and novel features disclosed in this document.
Claims (8)
1. A method for stage grinding of steel slag-industrial by-product gypsum composite powder, characterized in that the method comprises the following steps:
(1) Pre-iron removal: use a suspended iron remover for pre-iron removal after feeding and weighing steel slag block;
(2) Primary closed-loop crushing, separation and iron removal: separate steel slag block after pre-iron removal through a square sieve, perform primary crushing of oversize steel slag block in a crusher, and then is separated through a suspended iron remover and a vibrating square sieve, thus forming a primary closed-loop; remove iron from undersize steel slag by plate fluidized iron remover to obtain pre-crushed steel slag particles;
(3) Secondary closed-loop crushing, powder concentration and iron removal: perform secondary crushing of pre-crushed steel slag particles obtained from Step (2) in a roller press, concentrate powder of secondary-crushed steel slag particles in a powder concentrator to obtain the finest particles and crudest particles; secondarily concentrate powder of the described finest particles in a dynamic powder concentrator to obtain the second finest particles and second crudest particles; mix the described crudest particles with the described second crudest particles, remove iron through the plate fluidized iron remover, then return secondary crushing, thus forming a secondary closed-loop; and the described second finest particles form crude steel slag particles;
(4) Primary closed-loop grinding, powder concentration and iron removal: concentrate powder of crude steel slag particles formed from Step (3) to obtain the third finest particles and third crudest particles; perform primary grinding of the described third crudest particles in a primary tube mill, then remove iron through the plate fluidized iron remover, after that return for powder concentration and primary grinding again, thus forming a tertiary closed-loop and finally obtaining the third finest particles;
(5) Drying of industrial by-product gypsum: dry industrial by-product gypsum in a dryer;
(6) Secondary open-loop mixed grinding and iron removal: mix 50%-80% of the described third finest particles obtained from Step (4) and 20%-50% of the described dried industrial by-product gypsum simultaneously in a secondary tube mill for secondary mixed grinding, to eventually form steel slag-industrial by-product gypsum composite powder.
2. The method for stage grinding of steel slag-industrial by-product gypsum composite powder according to claim 1 is characterized in that the particle size of the described oversize steel slag block in Step (2) is greater than 22 mm, and the particle size of the described undersize pre-crushed steel slag is 18 - 22 mm.
3. The method for stage grinding of steel slag-industrial by-product gypsum composite powder according to claim 1 is characterized in that Step (3) is operated specifically as followed:
Description perform secondary crushing of pre-crushed steel slag particles in a roller press, then concentrate powder of secondary-crushed steel slag particles in a V-type powder concentrator driven by hot air from a hot-blast stove to obtain the finest particles and crudest particles.
4. The method for stage grinding of steel slag-industrial by-product gypsum composite powder according to claim 1 is characterized in that the described steel slag-industrial by-product gypsum composite powder in Step (6) has a specific surface area of 420 - 450 m2/kg, an iron content of 0.2% - 0.5%, and a water content of less than 0.5%.
5. The method for stage grinding of steel slag-industrial by-product gypsum composite powder according to claim 1 is characterized in that the described primary tube mill is 7 - 14.5 m in length and 2 - 4.6 m in diameter, and has 2 - 3 chambers; the grinding medium of the described primary tube mill is steel forging, and the diameter of the described steel forging is 20 - 80 mm.
6. The method for stage grinding of steel slag-industrial by-product gypsum composite powder according to claim 1 is characterized in that the described secondary tube mill is 7 - 14.5 m in length and 2 - 4.6 m in diameter, and has 2 - 3 chambers.
7. The method for stage grinding of steel slag-industrial by-product gypsum composite powder according to claim 6 is characterized in that the grinding medium of the described secondary tube mill is steel ball or fine steel forging, and the diameter of the described steel ball or fine steel forging is 10 - 20 mm.
8. The method for stage grinding of steel slag-industrial by-product gypsum composite powder according to any of claims 1-7 is characterized in that the described steel slag is one of converter steel slag (hot splashing steel slag, hot braised steel slag, roller steel slag, etc.) or electric stove slag; the described industrial by-product gypsum is one or more of desulfurized gypsum, phosphogypsum, fluorogypsum, lemon gypsum and waste pottery gypsum.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624637A (en) * | 2020-12-18 | 2021-04-09 | 天津水泥工业设计研究院有限公司 | High-activity steel slag micro powder preparation system |
| CN112642580A (en) * | 2020-12-01 | 2021-04-13 | 湖北理工学院 | Disposal method for gradient utilization of steel slag |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112642580A (en) * | 2020-12-01 | 2021-04-13 | 湖北理工学院 | Disposal method for gradient utilization of steel slag |
| CN112642580B (en) * | 2020-12-01 | 2023-10-13 | 湖北理工学院 | Disposal method for gradient utilization of steel slag |
| CN112624637A (en) * | 2020-12-18 | 2021-04-09 | 天津水泥工业设计研究院有限公司 | High-activity steel slag micro powder preparation system |
| CN112624637B (en) * | 2020-12-18 | 2022-11-08 | 天津水泥工业设计研究院有限公司 | High-activity steel slag micro powder preparation system |
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