CA2840670A1 - Process for dry recycling and processing of steel slag - Google Patents
Process for dry recycling and processing of steel slag Download PDFInfo
- Publication number
- CA2840670A1 CA2840670A1 CA2840670A CA2840670A CA2840670A1 CA 2840670 A1 CA2840670 A1 CA 2840670A1 CA 2840670 A CA2840670 A CA 2840670A CA 2840670 A CA2840670 A CA 2840670A CA 2840670 A1 CA2840670 A1 CA 2840670A1
- Authority
- CA
- Canada
- Prior art keywords
- slag
- steel slag
- grouts
- steel
- recycling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000002893 slag Substances 0.000 title claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004064 recycling Methods 0.000 title claims abstract description 11
- 238000012545 processing Methods 0.000 title claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 25
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 238000007885 magnetic separation Methods 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 230000003116 impacting effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 239000013618 particulate matter Substances 0.000 claims description 2
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 25
- 239000004570 mortar (masonry) Substances 0.000 abstract description 22
- 239000000654 additive Substances 0.000 abstract description 15
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 9
- 239000004593 Epoxy Substances 0.000 abstract description 8
- 239000004575 stone Substances 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 4
- 239000004576 sand Substances 0.000 abstract description 3
- 239000008187 granular material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 24
- 239000002994 raw material Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 11
- 239000000395 magnesium oxide Substances 0.000 description 11
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 9
- 239000000292 calcium oxide Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 8
- 230000000996 additive effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 4
- 239000004567 concrete Substances 0.000 description 4
- 239000011440 grout Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 102100039659 Adenylate cyclase type 3 Human genes 0.000 description 1
- 101710194150 Adenylate cyclase type 3 Proteins 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to a process for recycling and processing steel slag, comprising the removal of the metal fractions of the slag in an innovative separation system and through the metal-free material, to produce granules of ore and steel shot, sealing block, apparent blocks, building blocks, interlocking floors in all models, caissons, guides, masonry mortar, adhesive mortar, floor on floor mortar, pumpable mortars, grouts, colored grouts, flexible grouts, epoxy grouts, epoxy masses, replacing natural minor aggregates, as the sand and crushing stone by steel slag in their proper particle size and especially the replacement of 100% of the conventional cement produced by a steel slag cement, applying additives from 0.1% to 30% of additives, depending on the application of each product. The invention belongs to the recycling area, specifically the recycling of steel slag.
Description
..
PROCESS FOR DRY RECYCLING AND PROCESSING OF STEEL SLAG
Field of the Invention The present invention belongs to the field of recycling and more specifically to dry processing and recycling of steel slag, removing the metal fraction of the slag in such an innovative process and through the metal-free material.
Through the process of the present invention, one can produce granules of ore shot and steel shot, sealing blocks, apparent blocks, building blocks, interlocking floors in all models, caissons, guides, masonry mortar, adhesive mortar, floor on floor mortar, pumpable mortars, grouts, colored grouts, flexible grouts, epoxy grouts, epoxy mass for production of floors, grouts of several strengths replacing natural lower aggregates such as sand, crushed stone by steel slag in their particle sizes with the addition of cement at 0.1% to 40%. The product obtained by the process of the present invention is particularly used in replacement of 100% of the conventional cement produced by a cement produced from steel slag, applying additives from 0.1% to 30% additives, depending on the application of each product.
Background of the Invention All literary processes described to date for the process to control expansion of steel slag are to develop a route from the wet process, ie, via a discontinuous process and which demands high availability of time and space to hydration by water of steel slag, which makes it unfeasible, ecologically and financially.
Summary of the Invention The present invention aims to provide a process for recycling and transforming steel slag by a dry route, generating basic raw materials for obtaining, for example the following products:
1. Interlocking floors of low, medium and high mechanical strength applicable to conditions of light, medium and heavy traffic in order to provide mechanical strength that meets current standards.
PROCESS FOR DRY RECYCLING AND PROCESSING OF STEEL SLAG
Field of the Invention The present invention belongs to the field of recycling and more specifically to dry processing and recycling of steel slag, removing the metal fraction of the slag in such an innovative process and through the metal-free material.
Through the process of the present invention, one can produce granules of ore shot and steel shot, sealing blocks, apparent blocks, building blocks, interlocking floors in all models, caissons, guides, masonry mortar, adhesive mortar, floor on floor mortar, pumpable mortars, grouts, colored grouts, flexible grouts, epoxy grouts, epoxy mass for production of floors, grouts of several strengths replacing natural lower aggregates such as sand, crushed stone by steel slag in their particle sizes with the addition of cement at 0.1% to 40%. The product obtained by the process of the present invention is particularly used in replacement of 100% of the conventional cement produced by a cement produced from steel slag, applying additives from 0.1% to 30% additives, depending on the application of each product.
Background of the Invention All literary processes described to date for the process to control expansion of steel slag are to develop a route from the wet process, ie, via a discontinuous process and which demands high availability of time and space to hydration by water of steel slag, which makes it unfeasible, ecologically and financially.
Summary of the Invention The present invention aims to provide a process for recycling and transforming steel slag by a dry route, generating basic raw materials for obtaining, for example the following products:
1. Interlocking floors of low, medium and high mechanical strength applicable to conditions of light, medium and heavy traffic in order to provide mechanical strength that meets current standards.
2. Apparent and structural sealing blocks, normal finishing and fine finishing for internal and external environments.
...a
...a
3. Mortars of type AC I, AC II, AC III, adhesive mortar, "floor on floor"
mortar, pumpable mortars and designed mortars.
mortar, pumpable mortars and designed mortars.
4. Flexible grout, colored grouts and epoxy grouts.
5. Epoxy mass for the production of floors
6. Grout for structures, anchoring of equipment, recovery and all possible applications for this product.
7. Feedstock rich in CaO and MgO for the manufacture of cement, using steel slag, is this composition of cement mortars and grouts, tiles, blocks and grouts.
8. Metallic iron the following particle sizes:
a. greater than 2 mm for the manufacture of steel blocks to return in the production process of steel fabrication in steel industry.
b. Less than 2 mm for the manufacture of steel shot.
Moreover, the process aims to obtain results as:
1. The removal of metal, for inhibiting expandability.
2. Obtaining raw materials of higher strength of steel slag and with different particle sizes for fine aggregate, and 3. Obtaining raw materials of lower strength but high in calcium and magnesium oxide, to obtain fines for cement replacement.
In case of removal of metal, the steel slag, mainly composed by adding silica (SiO2), limestone and other components of a lower percentage, is intended to perform the final purification of the steel, which can reach temperatures of and 1400 C, so that the components undergo sintering process and is incorporated into metallic iron steel slag.
In addition, metallic iron may be incorporated in different particle sizes and in different oxidation states, ranging from metal iron (Fe ) to iron monoxide (FeO) and iron oxide (Fe2O3). The presence of iron in different oxidation states, mainly iron monoxide (FeO-Fe+2), will give an extremely magnetic character to the slag, which will compete with the magnetism of metallic iron. Thus, it is used an innovative process of separation of metallic iron (as shown in the flow chart of the drawings).
Brief Description of Figure Figure 1 is a process flow diagram for recycling and processing of steel slag according to the present invention.
Detailed Description Within the context of Figure 1, it will be observed that the process of the present invention basically comprises the following steps:
(A) comminution and breakdown by impacting mills, at a dry route;
(B) particle size classification in different sizes by screening, respecting the range of 0.074 mm to 12.50 mm, for use in the final products;
(C) magnetic separation in magnetic separators developed exclusively for the separation of metallic iron in the different particle size fractions;
(D) release of the slag associated with metallic iron through a stage of impact at impacting mills;
(E) drying the material through the rotary dryer, determining the route of control and treatment process of expandability of steel slag, by a dry route.
(F) new classification by screening, and (G) new magnetic separation for final purification of the metal.
Raw materials of higher strength Regarding the extraction of raw materials for added strength, the process according to the present invention has 100% economic sustainability, in which the main goal is to get all the basic raw materials for manufacture of floors, blocks, mortars, grouts and especially replacement of cement, from steel slag, after removal of the metal components.
Once done the process of disintegration, release and clearance of grains of the slag, non-magnetic fraction is used to render the grains for different applications, so you may need to meet the following additional steps depending on each intended application:
(1) define the optimal particle size for production of concrete blocks;
(2) define the grading curve for optimal packing of the grains to achieve maximum strength and lower cement consumption;
(3) define the particle size for the formulation of the mortar;
(4) define the particle size of the formulation of grout.
It is important to remember that at the process of separation of metallic components involving several stages of crushing, screening, magnetic separation at different particle size stages and final release of the slag, are automatically generated the basic raw materials for manufacture of floors, blocks, mortar and grouts.
Raw Materials of lower strength In relation to obtaining raw materials of lower strength, the item of greater economic sustainability of the project is to obtain compounds rich in CaO and MgO, which can produce raw material for cement replacement, considering that this component is the item major cost in the production of products to be developed.
In this same concept of recovering processing of metallic iron there is generated a component rich in CaO and MgO for the production of cement replacement, whereby it may be necessary to fulfill the following process steps:
(1) identification and separation of compounds rich in CaO and MgO, and (2) setting the particle size to produce cement substitute.
Laboratory Tests Laboratory tests were performed, and the obtained parameters to adjust the recovery process of metallic material and obtaining of raw matter. In the tests performed, the following steps occur:
1. Processing 4,000 kg of steel slag;
2. Comminution, breakdown, separation by different ranges of particle size;
3. Magnetic separation in different particle size ranges;
4. Breakdown, release and final cleaning of metal;
5. Obtaining the raw materials, all non-magnetic fractions;
6. Identification and chemical analysis of all non-magnetic compounds;
7. Separation of slag with high and low strength;
8. Size classification of slag with higher strength, separation by range of particle size;
a. greater than 2 mm for the manufacture of steel blocks to return in the production process of steel fabrication in steel industry.
b. Less than 2 mm for the manufacture of steel shot.
Moreover, the process aims to obtain results as:
1. The removal of metal, for inhibiting expandability.
2. Obtaining raw materials of higher strength of steel slag and with different particle sizes for fine aggregate, and 3. Obtaining raw materials of lower strength but high in calcium and magnesium oxide, to obtain fines for cement replacement.
In case of removal of metal, the steel slag, mainly composed by adding silica (SiO2), limestone and other components of a lower percentage, is intended to perform the final purification of the steel, which can reach temperatures of and 1400 C, so that the components undergo sintering process and is incorporated into metallic iron steel slag.
In addition, metallic iron may be incorporated in different particle sizes and in different oxidation states, ranging from metal iron (Fe ) to iron monoxide (FeO) and iron oxide (Fe2O3). The presence of iron in different oxidation states, mainly iron monoxide (FeO-Fe+2), will give an extremely magnetic character to the slag, which will compete with the magnetism of metallic iron. Thus, it is used an innovative process of separation of metallic iron (as shown in the flow chart of the drawings).
Brief Description of Figure Figure 1 is a process flow diagram for recycling and processing of steel slag according to the present invention.
Detailed Description Within the context of Figure 1, it will be observed that the process of the present invention basically comprises the following steps:
(A) comminution and breakdown by impacting mills, at a dry route;
(B) particle size classification in different sizes by screening, respecting the range of 0.074 mm to 12.50 mm, for use in the final products;
(C) magnetic separation in magnetic separators developed exclusively for the separation of metallic iron in the different particle size fractions;
(D) release of the slag associated with metallic iron through a stage of impact at impacting mills;
(E) drying the material through the rotary dryer, determining the route of control and treatment process of expandability of steel slag, by a dry route.
(F) new classification by screening, and (G) new magnetic separation for final purification of the metal.
Raw materials of higher strength Regarding the extraction of raw materials for added strength, the process according to the present invention has 100% economic sustainability, in which the main goal is to get all the basic raw materials for manufacture of floors, blocks, mortars, grouts and especially replacement of cement, from steel slag, after removal of the metal components.
Once done the process of disintegration, release and clearance of grains of the slag, non-magnetic fraction is used to render the grains for different applications, so you may need to meet the following additional steps depending on each intended application:
(1) define the optimal particle size for production of concrete blocks;
(2) define the grading curve for optimal packing of the grains to achieve maximum strength and lower cement consumption;
(3) define the particle size for the formulation of the mortar;
(4) define the particle size of the formulation of grout.
It is important to remember that at the process of separation of metallic components involving several stages of crushing, screening, magnetic separation at different particle size stages and final release of the slag, are automatically generated the basic raw materials for manufacture of floors, blocks, mortar and grouts.
Raw Materials of lower strength In relation to obtaining raw materials of lower strength, the item of greater economic sustainability of the project is to obtain compounds rich in CaO and MgO, which can produce raw material for cement replacement, considering that this component is the item major cost in the production of products to be developed.
In this same concept of recovering processing of metallic iron there is generated a component rich in CaO and MgO for the production of cement replacement, whereby it may be necessary to fulfill the following process steps:
(1) identification and separation of compounds rich in CaO and MgO, and (2) setting the particle size to produce cement substitute.
Laboratory Tests Laboratory tests were performed, and the obtained parameters to adjust the recovery process of metallic material and obtaining of raw matter. In the tests performed, the following steps occur:
1. Processing 4,000 kg of steel slag;
2. Comminution, breakdown, separation by different ranges of particle size;
3. Magnetic separation in different particle size ranges;
4. Breakdown, release and final cleaning of metal;
5. Obtaining the raw materials, all non-magnetic fractions;
6. Identification and chemical analysis of all non-magnetic compounds;
7. Separation of slag with high and low strength;
8. Size classification of slag with higher strength, separation by range of particle size;
9. Separation of the slag of lower strength and grinding below 325 mesh;
10. Composition of particle size, with the slag of higher strength, for the manufacture of the products described above;
11. Definition of trace (relative of steel slag cement x water x additive) for interlocking floors of steel slag;
Apparent blocks, for closure and structural
Apparent blocks, for closure and structural
12. Composition of the particle size for the manufacture of steel slag blocks;
13. Definition of trace (relative to steel slag cement x water x additive) for blocks of steel slag;
14. Production of steel slag blocks;
15. Test of mechanical strength (to compression), water and moisture absorption;
Concrete blocks
Concrete blocks
16. Composition of the particle size for the manufacture of steel slag blocks;
17. Definition of trace (relative to steel slag cement x water x additive) for blocks of steel slag;
18. Production of steel slag blocks;
19. Test of mechanical strength (to compression), water and moisture absorption;
Floors of high strength
Floors of high strength
20. Composition of the particle size for the manufacture of high strength floors;
21. Definition of trace (relative to steel slag cement x water x additive) for floors with high mechanical strength;
22. Test of mechanical strength (to compression), water and moisture absorption;
Mortar
Mortar
23. Composition of the particle size for manufacturing mortar;
24. Definition of trace (relative to steel slag cement x water x additive) for mortar;
25. Test of strength and pullout index;
Grouting Mass
Grouting Mass
26. Composition of the particle size for manufacturing of grouting mass;
27. Definition of trace (relative to steel slag cement x water x additive) for grouting;
28. Mechanical strength and weathering test (weather degradation);
Production of Replacement for Cement Once identified the raw material of lower mechanical strength rich in CaO
and MgO, the raw material was comminuted to -325 mesh, then the additive of cement replacement by inserting special additives (slag activators), and implementation of test for different traces for different applications.
In more detail, it may be noted that the invention provides a process with a dry route for the control of expansion factors (CaO, MgO and metallic iron), contained in the steel slag.
During processing, it was found that the slag, when heated in a controlled manner (residence time of 30 seconds at +1300 C), actives binding properties of the slag, as well as facilitates removal of friable material (free CaO and MgO), elements which, under normal conditions, react with water to form expandable hydroxides (Ca0H2 and Mg0H2).
The main steps involved in the process and treatment of steel slag are feeding scum, primary crushing, drying, secondary crushing, metal separation, particle size classification, dust collectors and storage of aggregates.
These steps can be described in greater detail as follows:
Feeding of slag: occurs by means of a vibratory feeder in which the slag in the primary crusher is measured;
Primary crushing: through the mill, the size of gross slag is reduced;
Drying: crushed slag is exposed at a controlled manner to determined temperature and time;
Secondary crushing: the friable material is separated into mill, whose principle of operation is the impact.
.4*
Magnetic Separation: after the grinding, fractionated slag is found with reduced content of calcium oxide (CaO) and magnesium oxide (MgO), so that all material is led to Magnetic Separation system.
Magnetic separation according to the invention takes place by means of randomly designed magnets with different intensities (Gauss) to capture particulate matter of different particle sizes.
After clearing the Metallic iron and part of the oxides (which cause expansion), the material is transported to the screening system.
Size classification: After the classification in vibrating screen, there is obtained a controlled steel aggregate with permitted levels of CaO, MgO and iron oxides, which do not react when mixed with water and cement, eliminating the expansion.
Dust collectors: it is further provided a step of sleeve filtering that collects fine friable materials, arising from the dryer, the mill and the size classification system.
Storage of aggregates: The steel crushed stone classified as superfine, fine, medium and coarse size is stored in a covered location and is ready to be used in the production of artifacts.
The steel aggregate, after being treated by the process of the present invention replaces, with huge environmental gains, natural fine aggregates commonly used in the production of artifacts, such as crushed stone and sand.
The steel crushed stone can be used in the production of concrete artifacts such as interlocking floors, sealing blocks, building blocks, caissons, guides, curb, concrete, as well as adhesive mortars, floor on floor mortar, pumpable mortar, grout, colored grouts, flexible grouts, epoxy grouts, epoxy masses.
In turn, the fines produced during processing of slag have a cement function, and can be used in addition to the conventional cement, or in some cases by additives, or used to replace 100% of the conventional cement, by a cement produced by steel slag, applying additives from 0.1% to 30% of additives depending on the application and degree of strength of each product.
, With a demonstrative purpose, analytical results are shown below, which demonstrate the control of expandability of the slag processed according to the present invention.
TAG TYPE OF STANDARD RESULT STANDARD RESULT
ANALYSIS
14185 Expansibility DNIT ME 113/09 0.38% Up to 3%
14182 Durability ASTM C88-05 2.0%
<12% (coarse aggregate) <10% (small aggregate) 14182 Los Angeles ABNT NBR 7211:09 16% <23%
Abrasion 141096 Compressive NBR 9780/87 and Average > 35 MPa Strength NBR 9781/87 38.1%
141097 Compressive NBR 9780/87 and Average > 35 MPa Strength NBR 9781/87 45.9%
It is therefore a process of recycling and transforming of steel slag by a dry route of great importance to the objective pursued, fully meeting the proposed objectives and fulfilling at a practical and efficient manner the intended functions, providing advantages inherent to its applicability, with specific and innovative characteristics and provided with fundamental requirements of novelty and inventive activity, required to obtain patent protection.
Production of Replacement for Cement Once identified the raw material of lower mechanical strength rich in CaO
and MgO, the raw material was comminuted to -325 mesh, then the additive of cement replacement by inserting special additives (slag activators), and implementation of test for different traces for different applications.
In more detail, it may be noted that the invention provides a process with a dry route for the control of expansion factors (CaO, MgO and metallic iron), contained in the steel slag.
During processing, it was found that the slag, when heated in a controlled manner (residence time of 30 seconds at +1300 C), actives binding properties of the slag, as well as facilitates removal of friable material (free CaO and MgO), elements which, under normal conditions, react with water to form expandable hydroxides (Ca0H2 and Mg0H2).
The main steps involved in the process and treatment of steel slag are feeding scum, primary crushing, drying, secondary crushing, metal separation, particle size classification, dust collectors and storage of aggregates.
These steps can be described in greater detail as follows:
Feeding of slag: occurs by means of a vibratory feeder in which the slag in the primary crusher is measured;
Primary crushing: through the mill, the size of gross slag is reduced;
Drying: crushed slag is exposed at a controlled manner to determined temperature and time;
Secondary crushing: the friable material is separated into mill, whose principle of operation is the impact.
.4*
Magnetic Separation: after the grinding, fractionated slag is found with reduced content of calcium oxide (CaO) and magnesium oxide (MgO), so that all material is led to Magnetic Separation system.
Magnetic separation according to the invention takes place by means of randomly designed magnets with different intensities (Gauss) to capture particulate matter of different particle sizes.
After clearing the Metallic iron and part of the oxides (which cause expansion), the material is transported to the screening system.
Size classification: After the classification in vibrating screen, there is obtained a controlled steel aggregate with permitted levels of CaO, MgO and iron oxides, which do not react when mixed with water and cement, eliminating the expansion.
Dust collectors: it is further provided a step of sleeve filtering that collects fine friable materials, arising from the dryer, the mill and the size classification system.
Storage of aggregates: The steel crushed stone classified as superfine, fine, medium and coarse size is stored in a covered location and is ready to be used in the production of artifacts.
The steel aggregate, after being treated by the process of the present invention replaces, with huge environmental gains, natural fine aggregates commonly used in the production of artifacts, such as crushed stone and sand.
The steel crushed stone can be used in the production of concrete artifacts such as interlocking floors, sealing blocks, building blocks, caissons, guides, curb, concrete, as well as adhesive mortars, floor on floor mortar, pumpable mortar, grout, colored grouts, flexible grouts, epoxy grouts, epoxy masses.
In turn, the fines produced during processing of slag have a cement function, and can be used in addition to the conventional cement, or in some cases by additives, or used to replace 100% of the conventional cement, by a cement produced by steel slag, applying additives from 0.1% to 30% of additives depending on the application and degree of strength of each product.
, With a demonstrative purpose, analytical results are shown below, which demonstrate the control of expandability of the slag processed according to the present invention.
TAG TYPE OF STANDARD RESULT STANDARD RESULT
ANALYSIS
14185 Expansibility DNIT ME 113/09 0.38% Up to 3%
14182 Durability ASTM C88-05 2.0%
<12% (coarse aggregate) <10% (small aggregate) 14182 Los Angeles ABNT NBR 7211:09 16% <23%
Abrasion 141096 Compressive NBR 9780/87 and Average > 35 MPa Strength NBR 9781/87 38.1%
141097 Compressive NBR 9780/87 and Average > 35 MPa Strength NBR 9781/87 45.9%
It is therefore a process of recycling and transforming of steel slag by a dry route of great importance to the objective pursued, fully meeting the proposed objectives and fulfilling at a practical and efficient manner the intended functions, providing advantages inherent to its applicability, with specific and innovative characteristics and provided with fundamental requirements of novelty and inventive activity, required to obtain patent protection.
Claims
1. Process for recycling and processing steel slag at a dry route, characteized by the steps of:
(a) feeding the slag by means of a vibratory feeder in which the slag is measured in the primary crusher;
(b) primary mill crushing, wherein the size of gross slag is reduced;
(c) drying the crushed slag by controlled exposure to determined temperature and time;
(d) secondary crushing of friable material with separation at an impacting mill;
(e) magnetic separation of slag fractionated by magnets with different intensities, to capture particulate matter of different grain sizes;
(f) elimination of the metallic iron and oxides;
(g) transporting the material to a screening system;
(h) particle size classification in vibrating screen with obtaining a controlled-added steel; and (i) sleeve filtering to collect friable fine materials, from the dryer, the mill and the size classification system.
(a) feeding the slag by means of a vibratory feeder in which the slag is measured in the primary crusher;
(b) primary mill crushing, wherein the size of gross slag is reduced;
(c) drying the crushed slag by controlled exposure to determined temperature and time;
(d) secondary crushing of friable material with separation at an impacting mill;
(e) magnetic separation of slag fractionated by magnets with different intensities, to capture particulate matter of different grain sizes;
(f) elimination of the metallic iron and oxides;
(g) transporting the material to a screening system;
(h) particle size classification in vibrating screen with obtaining a controlled-added steel; and (i) sleeve filtering to collect friable fine materials, from the dryer, the mill and the size classification system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2840670A CA2840670A1 (en) | 2014-01-22 | 2014-01-22 | Process for dry recycling and processing of steel slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2840670A CA2840670A1 (en) | 2014-01-22 | 2014-01-22 | Process for dry recycling and processing of steel slag |
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| CA2840670A1 true CA2840670A1 (en) | 2015-07-22 |
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ID=53675728
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| Application Number | Title | Priority Date | Filing Date |
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| CA2840670A Abandoned CA2840670A1 (en) | 2014-01-22 | 2014-01-22 | Process for dry recycling and processing of steel slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108453111A (en) * | 2017-02-20 | 2018-08-28 | 李国安 | A kind of production technology of slag micro powder |
| CN108866319A (en) * | 2018-08-17 | 2018-11-23 | 北京中科领向环保研究院有限公司 | A kind of system and method enhancing steel slag RO phase magnetism |
| CN110142123A (en) * | 2019-05-15 | 2019-08-20 | 江苏省镔鑫钢铁集团有限公司 | A kind of slag processing system and processing method |
| CN110586297A (en) * | 2019-09-29 | 2019-12-20 | 广东华鳌合金新材料有限公司 | Steel slag treatment method and steel slag treatment production line |
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| CN113578914A (en) * | 2021-06-02 | 2021-11-02 | 长安大学 | Steel slag strengthening treatment method integrating physicochemical reaction |
| CN114196824A (en) * | 2021-11-10 | 2022-03-18 | 武汉钢铁有限公司 | Preparation method of slag steel hot-pressing block |
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2014
- 2014-01-22 CA CA2840670A patent/CA2840670A1/en not_active Abandoned
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108453111A (en) * | 2017-02-20 | 2018-08-28 | 李国安 | A kind of production technology of slag micro powder |
| CN108866319A (en) * | 2018-08-17 | 2018-11-23 | 北京中科领向环保研究院有限公司 | A kind of system and method enhancing steel slag RO phase magnetism |
| CN110142123A (en) * | 2019-05-15 | 2019-08-20 | 江苏省镔鑫钢铁集团有限公司 | A kind of slag processing system and processing method |
| CN110586297A (en) * | 2019-09-29 | 2019-12-20 | 广东华鳌合金新材料有限公司 | Steel slag treatment method and steel slag treatment production line |
| CN112496332A (en) * | 2020-12-09 | 2021-03-16 | 钢城集团凉山瑞海实业有限公司 | Method and device for manufacturing fireproof material |
| CN113578914A (en) * | 2021-06-02 | 2021-11-02 | 长安大学 | Steel slag strengthening treatment method integrating physicochemical reaction |
| CN114196824A (en) * | 2021-11-10 | 2022-03-18 | 武汉钢铁有限公司 | Preparation method of slag steel hot-pressing block |
| CN114196824B (en) * | 2021-11-10 | 2023-12-01 | 武汉钢铁有限公司 | Preparation method of slag steel hot-pressed block |
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