CN112723761A - Full-solid waste modifier for reduction and reconstruction of molten steel slag, modification process and product - Google Patents
Full-solid waste modifier for reduction and reconstruction of molten steel slag, modification process and product Download PDFInfo
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- CN112723761A CN112723761A CN202110118205.XA CN202110118205A CN112723761A CN 112723761 A CN112723761 A CN 112723761A CN 202110118205 A CN202110118205 A CN 202110118205A CN 112723761 A CN112723761 A CN 112723761A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 141
- 239000010959 steel Substances 0.000 title claims abstract description 141
- 239000003607 modifier Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 72
- 239000002910 solid waste Substances 0.000 title claims abstract description 72
- 230000008569 process Effects 0.000 title claims abstract description 65
- 230000009467 reduction Effects 0.000 title claims abstract description 49
- 230000004048 modification Effects 0.000 title claims abstract description 29
- 238000012986 modification Methods 0.000 title claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 260
- 229910052742 iron Inorganic materials 0.000 claims abstract description 129
- 239000002699 waste material Substances 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims abstract description 33
- 239000000126 substance Substances 0.000 claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000010439 graphite Substances 0.000 claims abstract description 22
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003245 coal Substances 0.000 claims abstract description 19
- 239000002956 ash Substances 0.000 claims abstract description 18
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 17
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 14
- 239000010881 fly ash Substances 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims abstract description 5
- 239000011149 active material Substances 0.000 claims description 79
- 239000002994 raw material Substances 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 33
- 238000001035 drying Methods 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 25
- 238000011084 recovery Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000009628 steelmaking Methods 0.000 claims description 12
- 238000005469 granulation Methods 0.000 claims description 9
- 230000003179 granulation Effects 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000004566 building material Substances 0.000 abstract description 18
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 14
- 230000002195 synergetic effect Effects 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 230000029087 digestion Effects 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 18
- 239000002245 particle Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 16
- 238000002156 mixing Methods 0.000 description 15
- 239000004568 cement Substances 0.000 description 14
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- 239000000843 powder Substances 0.000 description 10
- 229910052681 coesite Inorganic materials 0.000 description 9
- 229910052906 cristobalite Inorganic materials 0.000 description 9
- 238000007885 magnetic separation Methods 0.000 description 9
- 239000000377 silicon dioxide Substances 0.000 description 9
- 229910052682 stishovite Inorganic materials 0.000 description 9
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
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- 150000004645 aluminates Chemical class 0.000 description 1
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- 239000010883 coal ash Substances 0.000 description 1
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- 239000002440 industrial waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous 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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention belongs to the technical field of steel smelting waste treatment and solid waste resource utilization, and particularly relates to a full-solid waste modifier for reduction and reconstruction of molten steel slag, a modification process and a product, wherein the full-solid waste modifier for reduction and reconstruction of molten steel slag comprises the following components in percentage by weight: the modifier is a mixture composed of industrial solid wastes, and comprises one or more of large industrial solid waste red mud, electrolytic aluminum ash, fly ash, waste soil, carbide slag, iron tailings, electrolytic waste graphite and coal gangue, and the modifier comprises the following main chemical components in percentage by weight: SiO 223％‑95％、Al2O35 to 85 percent of CaO, 0.1 to 70 percent of CaO and 5 to 20 percent of C. The invention provides a method for eliminating the stability risk of steel slag building material application, fully reducing and recycling iron oxide and obviouslyThe technology and the process method for improving the utilization rate of the steel slag and realizing the synergistic digestion of the red mud and other multi-industry solid wastes have important practical significance.
Description
Technical Field
The invention belongs to the technical field of steel smelting waste treatment and solid waste resource utilization, and particularly relates to a full-solid waste modifier for reduction and reconstruction of molten steel slag, a modification process and a product.
Background
The prior art and the defects are as follows:
the steel slag produced in converter steelmaking is about 15% of the yield of crude steel generally, and the annual output of steel slag in the whole country is about 1.2 hundred million tons. The steel slag contains fCaO and other components which are used in the field of building materials to influence the stability of the building materials, the RO phase causes low strength of building material products, and steel slag particles often wrap slag and iron to cause high grinding power consumption. The utilization of the steel slag is severely restricted by the characteristics of the steel slag, the comprehensive utilization rate of the steel slag is still maintained at about 30 percent till now, and the high resource utilization of the steel slag is still a great problem.
The existing steel slag treatment process (such as a roller, a stuffy tank and the like) needs to cool the molten steel slag to about 900 ℃ to form solid steel slag for roller or stuffy tank treatment, the heat energy of the steel slag cannot be effectively utilized, and the energy waste is serious. The treated steel slag still contains about 3 percent of fCaO, and the problem of building material stability cannot be solved. According to statistics, the TFe content in the steel slag raw slag is about 30% on average, wherein the MFe content is about 10%. The existing steel slag treatment process adopts magnetic separation, only metal iron MFe can be recovered, the conversion recovery rate of total iron TFe is only about 33%, about 67% of TFe is still left in steel slag tailings, and huge iron resource waste is formed.
The industrial solid waste discharge amount in China is extremely large, 1 hundred million tons of red mud, 300 million tons of aluminum ash, 6 million tons of fly ash, about 3 million tons of iron tailings and 3 million tons of coal gangue are produced every year in China. Related solid waste discharge enterprises need to provide special land to build a storage yard and also need to bear a large amount of environmental protection discharge taxes, the surrounding environment and the health of residents are also affected, and the large amount of industrial solid waste is urgently consumed and utilized. However, in the process of recycling industrial solid wastes, the problems of low solid waste mixing amount, high product cost, poor performance, low additional value, difficult market development and the like can not be solved.
The method applies the bulk industrial solid wastes such as red mud and the like which are difficult to treat to the steel slag treatment process, can realize the synergistic complementary digestion of various bulk solid wastes, and brings remarkable economic and social benefits for enterprises.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the technology and the process method for eliminating the application stability risk of the steel slag building material, reducing and recovering iron oxide in full quantity, remarkably improving the utilization rate of the steel slag and realizing the synergistic consumption of red mud and other multi-industry solid wastes have important practical significance.
Disclosure of Invention
The invention aims to provide a full solid waste modifier for reducing and reconstructing molten steel slag, a modification process and a product for solving the technical problems in the prior art. The modifier is a mixture consisting of one or more of carbide slag, fly ash, red mud, aluminum ash, iron tailings, coal gangue, waste graphite and other bulk industrial solid wastes which are treated by the processes of drying, crushing, uniformly mixing, granulating and the like, and the main chemical components of the modifier satisfy the following conditions in percentage by weight of SiO2 3％-95％、Al2O35 to 85 percent of CaO, 0.1 to 70 percent of CaO and C5 to 20 percent of CaO. The modifier and the molten steel slag of the converter complete reduction and reconstruction reaction in a modification electric furnace, so as to realize the layering of the material iron and carry out iron tapping and discharging treatment, thereby obtaining molten iron for steelmaking and a reconstructed active material. Reconstituted active material fCaO content<0.2 percent, has no risk of building material stability, and can meet the technical requirements of S95 grade or S105 grade slag powder when used in place of cement according to national standards. The invention utilizes the solid waste to treat the solid waste, and realizes the synergistic consumption of the solid waste in multiple industries. Compared with the prior steel slag treatment process, the iron phase of the converter slag is reduced into molten iron, the gain factor omega of iron resources is more than 2, and the slag phase of the converter slag is converted into a reconstructed active material, so that the building material treatment with high activity and zero stability risk is realized.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
the all-solid-waste modifier for the reduction and reconstruction of the molten steel slag comprises the following components in percentage by weight: the modifier is a mixture composed of industrial solid wastes, and comprises one or more of large industrial solid waste red mud, electrolytic aluminum ash, fly ash, waste soil, carbide slag, iron tailings, electrolytic waste graphite and coal gangue, and the modifier comprises the following main chemical components in percentage by weight: SiO 22 3％-95％、Al2O3 5％-85％、CaO 0.1％-70％、C 5％-20％。
The invention can also adopt the following technical scheme:
a full-solid waste modification process for reduction and reconstruction of molten steel slag comprises the following steps: firstly, one or more of large industrial solid waste red mud, electrolytic aluminum ash, fly ash, waste soil, carbide slag, iron tailings, electrolytic waste graphite and coal gangue are used, when the moisture and the granularity of the modifier raw material do not satisfy the moisture content of less than or equal to 1.5 percent and the granularity of less than 0.5mm, the modifier raw material is dried and crushed at the drying temperature of 120-500 ℃, the dried and crushed material and other modifier raw materials with the moisture content of less than or equal to 1.5 percent and the granularity of less than 0.5mm enter a mixer together to be mixed uniformly, and the mixed material is granulated by a granulator to form a finished granular modifier.
In the above-mentioned all-solid-waste modification process of molten steel slag reduction and reconstruction, further, the raw materials of the modifier which can be directly fed into the mixer meet the requirements that the water content is less than or equal to 1.5% and the granularity is less than 5 mm; the water content of the dried and crushed material is less than or equal to 1.5 percent, and the granularity is less than 5 mm; the water content of the finished modifier is less than or equal to 1.5%, and the granularity is less than 15 mm.
In the above process for modifying the total solid waste after the reduction and reconstruction of molten steel slag, further, the process for modifying the total solid waste after the reduction and reconstruction of molten steel slag further comprises the following steps:
(1) receiving slag and feeding materials: receiving molten steel slag of the converter, conveying the molten steel slag into a modifying furnace, adding a finished modifying agent into the modifying furnace according to the proportion of 5-35% during the feeding period, and carrying out reduction and reconstruction reaction, wherein the temperature of a molten pool in the modifying furnace is more than or equal to 1500 ℃ and is kept for more than 30 min;
(2) tapping and deslagging: after the reduction and reconstruction reaction is finished, two products of molten iron and reconstructed active materials are formed, the molten iron is discharged from the bottom of the modification furnace, and the reconstructed active materials are discharged from the side part of the modification furnace;
(3) cooling and granulating the reconstructed active material, and recycling molten iron for converter steelmaking: transporting the discharged reconstituted active material to a cooling granulation facility for treatment; the molten iron is recycled to the converter to be used as a steelmaking raw material.
A full-solid waste modified process product for molten steel slag reduction reconstruction meets the following conditions:
(1) the molten iron components meet the condition that the TFe content is more than or equal to 92 percent, the TFe reduced recovery rate theta of the converter molten steel slag is more than or equal to 95 percent, and the iron resource gain factor omega is more than or equal to 2.0;
(2) the chemical components of the reconstructed active material satisfy that the TFe content is less than or equal to 1.5 percent and the fCaO content of the reconstructed active material is less than or equal to 0.2 percent in percentage by weight.
The reconstructed active material is ground and then replaces cement, and the technical requirements of S95-grade or S105-grade slag powder can be met.
In conclusion, the invention has the following advantages and positive effects:
1. the invention takes the whole solid wastes as the raw material of the modifier, carries out reconstruction and reduction on the steel slag which is difficult to utilize, adopts a win-win process method of consuming the steel slag by using a large amount of solid wastes, and has low manufacturing cost, high economic value of products and strong market competitiveness.
2. The steel slag of the invention contains all iron including iron oxide in various forms, more than 95% of all iron is reduced into simple substance iron, and compared with the existing steel slag treatment process, the iron resource gain factor omega is more than 2 times.
3. The steel slag tailings obtained after the traditional steel slag disposal process contain RO phase with poor activity and fCaO with higher content, so that the building material activity and stability are poor, and the utilization difficulty is high. The reconstituted active material product obtained by the invention has extremely low residual TFe content and extremely low fCaO content. The reconstructed active material can replace cement in a large proportion to be applied to the field of building materials, and a new process is provided for solving the problem of piling up a large amount of steel slag tailings formed by the existing steel slag treatment process.
4. The invention adopts the processes of drying, crushing, mixing and granulating, so that various modifiers are uniformly mixed and react with the molten steel slag more fully. The particle type modifier avoids the problems of fine powder addition drift loss and uneven solid-liquid two-phase reaction of the modifier and the molten steel slag, shortens the reduction and reconstruction reaction time of the molten steel slag, and reduces the reduction and reconstruction energy consumption.
5. In the traditional steel slag disposal process, the molten steel slag needs to be cooled to about 800 ℃ for further disposal, and a lot of heat is wasted. The process directly disposes the molten steel slag poured out of the converter at the temperature of more than 1500 ℃, and the heat can be utilized.
6. The invention carries out online high-temperature modification treatment on the molten converter steel slag to obtain a product with high added value. The modifier prepared by the bulk industrial solid waste material is mixed with the molten converter steel slag, and the bulk industrial solid waste material and the molten converter steel slag are subjected to chemical reaction under the high-temperature condition, so that the bulk industrial solid waste digestion treatment is realized, the steel slag is converted into molten iron and a reconstructed active material, the fCaO content in the reconstructed active material is extremely low, the building material stability risk is avoided, the strength of a building material product is high, and the problem that the steel slag tailings in the existing steel slag treatment process are difficult to utilize is solved.
7. The modifier and the molten steel slag of the converter complete reduction and reconstruction reaction in the modification electric furnace, realize the layering of the material iron and the treatment of iron tapping and discharging, and obtain molten iron for steelmaking and reconstructed active material. The content of the reconstituted active material fCaO is less than 0.2%, the risk of building material stability is avoided, and the technical requirements of S95-grade or S105-grade slag powder can be met when the reconstituted active material fCaO is used in place of cement according to national standards. The invention utilizes the solid waste to treat the solid waste, and realizes the synergistic consumption of the solid waste in multiple industries. Compared with the prior steel slag treatment process, the iron phase of the converter slag is reduced into molten iron, the gain factor omega of iron resources is more than 2, and the slag phase of the converter slag is converted into a reconstructed active material, so that the building material treatment with high activity and zero stability risk is realized.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The full-solid waste modifier for the reduction and reconstruction of the molten steel slag is a mixture consisting of industrial solid waste and is prepared from red mud and electrolytic aluminum ashOne or more of fly ash, waste soil, carbide slag, iron tailings, electrolytic waste graphite and coal gangue. The total solid waste modifier comprises the following main chemical components in percentage by weight: SiO 22 3％-95％、Al2O3 5％-85％、CaO 0.1％-70％、C 5％-20％。
The full solid waste modifier and the molten steel slag realize good reconstruction reduction reaction, and the full solid waste modifier has uniform components and certain granularity to ensure homogenization with the molten steel slag. A modification process of a full-solid waste modifier for reduction and reconstruction of molten steel slag comprises the steps of measuring the moisture and granularity of raw materials such as carbide slag, fly ash, red mud, aluminum ash, iron tailings, coal gangue and waste graphite selected by the modifier, wherein the moisture and granularity do not meet the requirements that the moisture is less than or equal to 1.5% and the granularity is less than 5mm, carrying out drying and crushing treatment, controlling the drying temperature to be between 120 ℃ and 500 ℃ according to the moisture, wherein the moisture and granularity meet the requirements that the moisture is less than or equal to 1.5% and the granularity is less than 5mm, and the raw materials do not need to be. And (3) feeding the dried and crushed material and the material with the water granularity meeting the condition into a mixer for uniform mixing, and granulating the uniformly mixed material by a granulator to form a finished granular modifier, wherein the water content of the finished modifier is less than or equal to 1.5%, and the granularity of the finished modifier is less than 15 mm.
The molten steel slag of the converter is poured into a slag pot from the converter, transported from the slag pot and put into a modifying furnace, and during the period, the finished product of the modifying agent is added into the modifying furnace along with the slag flow. And raising the temperature of the modifying furnace to promote the molten steel slag of the converter and the modifying agent to perform reduction and reconstruction reaction to form two products of molten iron and reconstructed active materials, wherein the molten iron is discharged from the bottom of the modifying furnace, and the reconstructed active materials are discharged from the side part of the modifying furnace. And (4) conveying the discharged reconstructed active material to a cooling granulation facility for treatment, and recycling molten iron as a steelmaking raw material in a converter.
The reconstructed active material is ground and then replaces cement, and the technical requirements of S95-grade or S105-grade slag powder can be met.
Detecting the moisture and granularity of industrial solid wastes such as red mud, waste soil, carbide slag, iron tailings, electrolytic waste graphite, coal gangue, fly ash and electrolytic aluminum ash which are used as raw materials of the full-solid waste modifier, sieving the raw materials which meet the moisture requirement but do not meet the granularity requirement by a sieve vibrating screen machine with a sieve pore of 5mm, feeding oversize materials with the size larger than 5mm into a crusher, crushing the oversize materials with the size smaller than 5mm into a mixer, and feeding the oversize materials with the size smaller than 5mm into the mixer. The raw materials meeting the granularity requirement but not meeting the moisture requirement are sent into a dryer to be dried until the moisture is less than or equal to 1.5 percent. And (3) feeding the raw materials and the dried and crushed materials with the moisture granularity meeting the requirements into a mixer to complete the uniform mixing of the all-solid-waste modifier, and granulating the uniformly mixed materials. Finally forming a finished product of the particle modifier, wherein the water content of the particles is less than or equal to 1.5 percent, and the particle size of the finished product particles is less than 15 mm.
Wherein, the crusher can be selected from a jaw crusher, an impact crusher, a double-roll crusher, etc. The dryer can be selected from a rotary dryer, a fluidized bed dryer, etc. And a drying hammer crusher with two functions of drying and crushing can be selected.
The molten steel slag poured out from the converter is transferred to a modifying furnace through a slag ladle and a slag pot, heat preservation and heating are carried out, a modifying agent is added into the modifying furnace according to the proportion of 5-35% during heating, the adjustment of the adding proportion of the modifying agent can be determined according to the viscosity of a molten pool slag system or the sampling analysis data of the molten slag, and the molten pool slag system with moderate viscosity and good liquidity is beneficial to completely separating iron slag and promoting the high activity of the slag. The molten steel slag and the modifier are subjected to reduction and reconstruction reaction to form molten iron and molten reconstruction active materials. The molten iron is deposited at the bottom of the molten pool due to high density; the molten reconstructed active material has low density and floats on the upper part of molten iron. In the whole modification and reconstruction process, the temperature of a molten pool in the furnace is kept to be more than or equal to 1500 ℃ in a heating and heat supplementing mode. The heat preservation and heating process lasts for more than 30 min.
The reforming furnace can be a general heating device such as an electric arc furnace, an induction furnace and the like.
The embodiment comprises the following steps:
(1) and (4) preparing a modifier. The method comprises the following steps of taking industrial solid wastes such as red mud, waste soil, carbide slag, iron tailings, electrolytic waste graphite, coal gangue, coal ash and electrolytic aluminum ash as modifier raw materials, classifying according to the requirements of moisture and granularity, sending the raw materials with the moisture or the granularity not meeting the requirements into a drying crusher for drying and crushing treatment, sending the dried and crushed materials and other raw materials with the moisture and the granularity meeting the requirements into a mixer for homogenizing and mixing, sending the mixed materials into a granulator for granulation after the mixing is finished, and finally forming a modifier finished product, wherein the moisture content of the granules is less than or equal to 1.5%, and the granularity of the finished product granules is less than 15 mm.
Wherein, when the moisture and the granularity of the raw materials of the modifier meet the conditions that the moisture is less than or equal to 1.5 percent and the granularity is less than 5mm, the drying and crushing treatment is not needed. After the modifier raw material which does not meet the requirements of moisture and granularity is dried and crushed, the moisture and the granularity meet the requirements that the moisture is less than or equal to 1.5 percent and the granularity is less than 5 mm.
The temperature of the heat source airflow of the drying crusher is between 120 ℃ and 500 ℃, and the suitability can be adjusted according to the moisture content of the modifier raw material entering the drying crusher.
The main chemical components of the modifier finished product meet the requirement of SiO according to the mass percentage23％-95％、Al2O35 to 85 percent of the total weight of the carbon-containing composite material, 0.1 to 70 percent of CaO and 5 to 20 percent of carbon.
(2) And (5) receiving slag and feeding. Pouring the molten steel slag of the converter into a modification furnace for heat preservation and heating, adding a modifier into the modification furnace according to the proportion of 5-35% during heating, and carrying out reduction and reconstruction reaction on the molten steel slag and the modifier to form molten iron and a molten reconstruction active material. The molten iron is deposited at the bottom of the molten pool due to high density; the molten reconstructed active material has low density and floats on the upper part of molten iron. In the whole modification and reconstruction process, the temperature of a molten pool in the furnace is kept to be more than or equal to 1500 ℃, and the temperature is kept for more than 30 min.
The reforming furnace can be a general heating device such as an electric arc furnace, an induction furnace and the like.
Fe contained in molten steel slag2O3、Fe3O4And an iron phase such as FeO and the like, and the iron phase and carbon in the modifier are subjected to reduction reaction to generate molten iron. SiO contained in molten steel slag2、Al2O3Slag phases such as CaO and MgO components and P, S impurities, and SiO in the modifier2、Al2O3And CaO component generates a reconstruction reaction to form a new phase, and the new phase does not contain fCaO any more and mainly contains silicate minerals and aluminate minerals with similar composition to cement.
During the reduction and reconstruction process, the TFe conversion recovery rate theta of the molten steel slag of the converter is more than or equal to 95 percent. And (3) calculating the TFe reduced recovery rate theta of the converter steel slag by the reduction reconstruction process according to a formula (1).
Wherein: TFe1-the total iron content of the slag system consisting of molten steel slag and modifier;
TFe2-total iron content,%, of reconstituted active.
β＝1-α (1-2)
Wherein: TFeα-total iron content of finished modifier;
TFeβ-total iron content,%, of the converter molten steel slag;
the addition proportion of the alpha-modifier in the total material amount of the modifying furnace;
the addition proportion of the molten steel slag of the beta-converter in the total material amount of the modification furnace;
for comparison, when the iron is magnetically separated after the conventional steel slag treatment process is adopted, the TFe reduced recovery rate gamma of the converter steel slag in the iron magnetic separation process can be calculated according to the formula (2).
Wherein: TFe-total iron content of converter slag;
total iron content,%, of MFe-reconstituted active.
The iron resource gain factor omega represents the ratio of the recovery amount of the converter steel slag TFe in the reduction reconstruction process and the conventional steel slag magnetic separation iron process, and the iron resource gain factor omega is calculated according to a formula (3).
Wherein: TFe conversion recovery rate of the theta-reduction reconstruction process converter steel slag;
TFe conversion recovery rate of the steel slag of the gamma-magnetic separation iron process converter.
(3) Tapping and discharging. The fully modified converter melts the steel slag and converts the steel slag into two products, namely molten iron and reconstructed active material. The molten iron and the reconstructed active material form two layers of material iron in the molten pool due to density difference, wherein the molten iron has high density and sinks at the bottom of the molten pool, and the reconstructed active material has low density and floats above the molten iron layer. Molten iron is discharged from an opening at the bottom of the reforming furnace, and the reconstituted active material is discharged from an opening at the side of the reforming furnace.
(4) Cooling and granulating the reconstituted active material. The discharged molten and reconstructed active material is conveyed to a cooling granulation facility for quenching treatment; the discharged molten iron is transported to a converter as a steelmaking raw material to perform steelmaking.
The composition of the molten iron meets the condition that the TFe content is more than or equal to 92 percent. The chemical components of the reconstructed active material satisfy that the TFe content is less than or equal to 1 percent and the fCaO content of the reconstructed active material is less than or equal to 0.2 percent in percentage by weight; the reconstructed active material is ground to replace cement, and can meet the technical requirements of slag powder above S95 level (including S95 level).
In order to further understand the contents, features and effects of the present invention, the following examples are illustrated, and the following detailed descriptions are given:
example 1
The total solid waste modifier provided by the embodiment comprises the following raw material components in percentage by mass: 46.01 percent of red mud, 40.52 percent of waste soil and 13.47 percent of electrolytic waste graphite. The raw material components of the modifier are shown in table 1, and the formula and components of the modifier are shown in table 2.
TABLE 1 modifier raw Material composition/%)
| C | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | Moisture content | Particle size mm | |
| Red mud | 0.00 | 7.82 | 23.86 | 49.07 | 1.32 | 0.00 | 22.04 | <0.1 |
| Waste soil | 0.00 | 63.63 | 22.84 | 2.56 | 0.24 | 0.26 | 15.54 | <0.2 |
| Waste graphite | 78.41 | 7.93 | 6.27 | 2.43 | 1.17 | 0.30 | 1.10 | <0.2 |
TABLE 2 modifier formulation and chemical composition/%)
C, SiO in the modifier2、Al2O3The contents of the four components of CaO are closely related to the upgrading reduction effect. The modifier industrial waste material has low MgO content, little influence on modification reduction effect and Fe content2O3The content does not influence the progress of the modification reduction reaction. Thus, the exclusive rights define only four. In order to conveniently calculate the TFe reduced recovery rate gamma of the converter steel slag, the TFe reduced recovery rate theta of the converter molten steel slag, the iron resource gain times omega and the quaternary alkalinity, MgO and Fe are specially listed2O3And a TFe content.
The particle sizes of the red mud, the waste soil and the waste graphite all meet the requirement of being less than 5mm, independent crushing is not needed, but the moisture of the red mud and the waste soil is obviously higher, and the red mud and the waste soil need to enter a drying crusher for drying and crushing dry materials. The red mud and the waste soil are sent into a drying crusher, the drying temperature is 250-350 ℃, the water content of the mixture discharged from the drying crusher is 1.2 percent, and the material granularity is less than 5 mm. And (3) feeding the waste graphite and the dried and crushed mixture into a mixer for homogenizing and mixing, and after mixing is finished, feeding the mixture into a granulator for granulation, wherein the particle size of the finished modifier is 5-10 mm, and the water content of the particles is 0.9%.
When the converter discharges slag, a slag pot is adopted to receive slag and is conveyed to the front of a modifying furnace, the temperature of molten steel slag is measured at 1550 ℃, the molten steel slag in the slag pot and a modifying agent are synchronously poured into the modifying furnace, the temperature of a molten pool of the modifying furnace is maintained at about 1550 ℃, the temperature is kept for 30 minutes, the molten steel slag and the modifying agent perform reduction and reconstruction reaction to generate molten iron and a reconstructed active material, the molten iron with high density sinks into the bottom of the molten pool, and the reconstructed active material with low density is positioned at the upper part of the molten iron to form a clear material-iron interface. And discharging the molten iron at the bottom from a tapping hole at the bottom of the furnace, and discharging the reconstructed active material from a discharge hole at the side part of the furnace.
The main chemical components of the molten steel slag discharged from the converter are shown in Table 3.
TABLE 3 converter slag chemical composition/%)
| SiO2 | Al2O3 | CaO | MgO | FeO | MFe | TFe | fCaO | |
| Converter steel slag | 12.16 | 4.76 | 42.67 | 9.05 | 28.64 | 7.36 | 29.63 | 5.52 |
When the existing steel slag treatment process is adopted and magnetic separation is carried out on iron, the TFe conversion recovery rate gamma of the converter steel slag in the magnetic separation process is calculated according to the formula (2), wherein gamma is 7.36/29.63 and 24.8%.
In example 1, the modifier is added in an appropriate proportion of 35% and the converter molten steel slag in a proportion of 100% to 35% to 65%, as determined by the viscosity state of the molten slag system. Slag system total iron content TFe formed by molten steel slag and modifier1The results of the detection of the main chemical components of the product molten iron and the reconstituted active material are shown in tables 5 and 6, wherein the results of the detection of the main chemical components of the product molten iron and the reconstituted active material are 16.76% × 35% + 29.63% × 65% ═ 25.13%.
TABLE 5 iron melt chemical composition/%)
| Fe | C | Si | Mn | P | S | |
| Molten iron | 93.23 | 4.19 | 1.56 | 0.76 | 0.04 | 0.036 |
TABLE 6 reconstituted active chemical composition%
| SiO2 | Al2O3 | CaO | MgO | TFe | fCaO | |
| Reconstituted active material | 30.71 | 18.44 | 44.71 | 9.92 | 1.35 | 0.08 |
The content of TFe in molten iron is 93.23 percent, and the requirement of internal control index that the content of TFe is more than or equal to 92 percent is met. The TFe content in the reconstructed active material is 1.35 percent, and the requirement of internal control index that the TFe is less than or equal to 1.50 percent is met. According to the formula (1), the TFe conversion recovery rate theta of the converter steel slag in the reduction reconstruction process is (25.13% -1.35%)/25.13%/94.6%. Compared with the existing steel slag treatment process, the iron resource gain factor omega of the embodiment of the invention is 94.6%/24.8%/3.81.
The results of measuring the mortar strength and activity index of the reconstituted active material used as a cement admixture according to the national standard methods are shown in Table 7.
Table 7 reconstitution of active Material as Cement admixture Strength and Activity at various ages
The reconstructed active material meets the quality technical requirements of S95-grade slag powder in the national standard GB/T18046-2017. The fCaO content in the reconstructed active material is as low as below 0.1 percent, and the method has no application risk of stability and can be safely and reliably applied to the field of building materials.
Example 2
The total solid waste modifier provided by the embodiment comprises the following raw material components in percentage by mass: 68.87% of coal gangue, 27.36% of aluminum ash and 3.77% of electrolytic waste graphite. The raw material components of the modifier are shown in Table 8, and the formula and components of the modifier are shown in Table 9.
TABLE 8 modifier raw Material composition/%)
| C | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | Moisture content | Particle size mm | |
| Coal gangue | 14.81 | 66.58 | 3.28 | 2.24 | 6.36 | 2.48 | 1.40 | <50 |
| Aluminum ash | 0.00 | 8.79 | 70.4 | 0.48 | 1.02 | 5.08 | 1.08 | <0.1 |
| Waste graphite | 78.41 | 7.93 | 6.27 | 2.43 | 1.17 | 0.30 | 1.10 | <0.2 |
TABLE 9 modifier formulation and chemical composition/%)
The coal gangue, the aluminum ash and the waste graphite meet the requirement of less than 1.5 percent, and do not need to be independently dried, but the coal gangue has large granularity and needs to enter a drying crusher for crushing. The coal gangue is sent into a drying crusher, the drying temperature is 120-150 ℃, the final water content of the mixture discharged from the drying crusher is 1.04%, and the particle size of the final material is less than 5 mm. And (3) feeding the aluminum ash, the waste graphite and the crushed coal gangue into a mixer for homogenizing mixing, and after mixing, feeding the mixture into an extrusion granulator for extrusion granulation, wherein the particle size of the finished modifier is 5-15 mm, and the water content of the particles is 0.96%.
When the converter discharges slag, a slag pot is adopted to receive slag and is conveyed to the front of a modifying furnace, the temperature of molten steel slag is measured to be 1520 ℃, the molten steel slag in the slag pot and a modifying agent are synchronously poured into the modifying furnace, the temperature of a molten pool of the modifying furnace is raised to be about 1550 ℃, the temperature is kept for 30 minutes, the molten steel slag and the modifying agent perform reduction and reconstruction reaction to generate molten iron and a reconstructed active material, the molten iron with high density sinks into the bottom of the molten pool, and the reconstructed active material with low density is positioned at the upper part of the molten iron to form a clear material iron interface. And discharging the molten iron at the bottom from a tapping hole at the bottom of the furnace, and discharging the reconstructed active material from a discharge hole at the side part of the furnace.
The main chemical composition of the molten steel slag discharged from the converter is shown in Table 10.
TABLE 10 chemical composition/% of converter slag
| SiO2 | Al2O3 | CaO | MgO | FeO | MFe | TFe | fCaO | |
| Converter steel slag | 9.14 | 4.77 | 43.64 | 8.58 | 25.14 | 8.37 | 27.92 | 6.59 |
When the conventional steel slag treatment process is adopted and iron is magnetically separated, the TFe reduced recovery rate gamma of the converter steel slag in the iron magnetic separation process is calculated according to the formula (2), wherein gamma is 8.37/27.92 and is 30.0 percent.
In example 2, the modifier is suitable according to the viscosity state of the slag system of the molten poolThe adding proportion is 20 percent, and the proportion of the converter molten steel slag is 100 percent to 20 percent to 80 percent. Slag system total iron content TFe formed by molten steel slag and modifier1＝1.24％×20％+27.92％×80％＝22.59％，
The detection results of the main chemical components of the product molten iron and the reconstituted active material are shown in tables 11 and 12.
TABLE 11 iron melt chemical composition/%)
| Fe | C | Si | Mn | P | S | |
| Molten iron | 94.79 | 4.45 | 0.35 | 0.19 | 0.129 | 0.024 |
TABLE 12 reconstituted active materials chemical composition%
| SiO2 | Al2O3 | CaO MgO | TFe | fCaO | |
| Reconstituted active material | 27.78 | 13.21 | 57.83 11.67 | 0.96 | 0.02 |
The content of the TFe in the molten iron is 94.79 percent, and the requirement of the internal control index that the TFe content is more than or equal to 92 percent is met. The content of TFe in the reconstructed active material is 0.96 percent, and the requirement of internal control index that TFe is less than or equal to 1.50 percent is met. According to the formula (1), the TFe conversion recovery rate theta of the converter steel slag in the reduction reconstruction process is (22.59% -0.96%)/22.59% -93.9%. Compared with the existing steel slag magnetic separation iron treatment process, the iron resource gain factor omega of the embodiment of the invention is 93.9%/22.59%/3.13.
The results of measuring the mortar strength and activity index of the reconstituted active material used as a cement admixture according to the national standard methods are shown in Table 13.
Table 13 shows the strength and activity of each age of the reconstituted active material as a cement admixture
The reconstructed active material meets the quality technical requirements of S105-grade slag powder in the national standard GB/T18046-2017. The fCaO content in the reconstructed active material is as low as below 0.1%, and the reconstructed active material has no stability application risk and can be safely and reliably applied to the field of building materials.
Example 3
The total solid waste modifier provided by the embodiment comprises the following raw material components in percentage by mass: 52.69 percent of carbide slag, 35.97 percent of aluminum ash and 11.34 percent of electrolytic waste graphite. The raw material components of the modifier are shown in Table 14, and the formula and components of the modifier are shown in Table 15.
TABLE 14 modifier raw material composition/%)
| C | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | Moisture content | Particle size mm | |
| Carbide slag | 0.00 | 4.37 | 2.91 | 0.17 | 68.58 | 0.08 | 35.00 | <0.2 |
| Aluminum ash | 0.00 | 8.79 | 70.4 | 0.48 | 1.02 | 5.08 | 1.08 | <0.1 |
| Waste graphite | 78.41 | 7.93 | 6.27 | 2.43 | 1.17 | 0.30 | 1.10 | <0.2 |
TABLE 15 modifier formulation and chemical composition/%)
The granularity of the carbide slag, the aluminum ash and the waste graphite all meets the requirement of being less than 5mm, independent crushing is not needed, but the moisture content of the carbide slag is obviously higher, and the carbide slag needs to enter a drying crusher for drying and crushing. The coal gangue is sent into a drying crusher, the drying temperature is 350-500 ℃, the water content of the mixture discharged from the drying crusher is 1.39%, and the granularity of the material is less than 5 mm. And (3) feeding the aluminum ash, the waste graphite and the dried carbide slag into a mixer for homogenizing mixing, and after mixing, feeding into a granulator for granulation, wherein the particle size of the finished modifier product is 5-10 mm, and the water content of the particles is 1.09%.
When the converter discharges slag, a slag pot is adopted to receive slag and is conveyed to the front of a modifying furnace, the temperature of molten steel slag is measured to be 1500 ℃, the molten steel slag in the slag pot and a modifying agent are synchronously poured into the modifying furnace, the temperature of a molten pool of the modifying furnace is raised to be about 1550 ℃, the temperature is kept for 30 minutes, the molten steel slag and the modifying agent perform reduction and reconstruction reaction to generate molten iron and a reconstructed active material, the molten iron with high density sinks into the bottom of the molten pool, and the reconstructed active material with low density is positioned at the upper part of the molten iron to form a clear material iron interface. And discharging the molten iron at the bottom from a tapping hole at the bottom of the furnace, and discharging the reconstructed active material from a discharge hole at the side part of the furnace.
The main chemical composition of the molten steel slag discharged from the converter is shown in Table 16.
TABLE 16 chemical composition/% of converter slag
| SiO2 | Al2O3 | CaO | MgO | FeO | MFe | TFe | fCaO | |
| Converter steel slag | 14.62 | 6.05 | 40.32 | 9.10 | 17.51 | 7.64 | 21.26 | 6.05 |
When the conventional steel slag treatment process is adopted and iron is magnetically separated, the TFe reduced recovery rate gamma of the converter steel slag in the iron magnetic separation process is calculated according to the formula (2), wherein gamma is 7.64/21.26 or 35.9%.
In example 3, the modifier is added in an appropriate proportion of 5% and the converter molten steel slag in a proportion of 100% to 5% to 95%, as determined by the viscosity state of the molten slag system. Slag system total iron content TFe formed by molten steel slag and modifier1＝0.38％×5％+21.26％×95％＝20.21％，
The detection results of the main chemical components of the product molten iron and the reconstituted active material are shown in tables 17 and 18.
TABLE 17 iron melt chemical composition/%)
| Fe | C | Si | Mn | P | S | |
| Molten iron | 93.33 | 3.68 | 1.69 | 0.85 | 0.06 | 0.03 |
TABLE 18 reconstituted active chemical composition%
The content of TFe in the molten iron is 93.33 percent, and the requirement of internal control indexes that the content of TFe is more than or equal to 92 percent is met. The content of TFe in the reconstructed active material is 0.70 percent, and the requirement of internal control index that TFe is less than or equal to 1.50 percent is met. According to the formula (1), the TFe conversion recovery rate theta of the converter steel slag in the reduction reconstruction process is (20.21% -0.70%)/20.21%: 95.1%. Compared with the existing steel slag treatment process, the iron resource gain factor omega of the embodiment of the invention is 95.1%/35.9%/2.64.
The results of measuring the mortar strength and activity index of the reconstituted active material used as a cement admixture according to the national standard methods are shown in Table 19.
Table 19 Reconfiguration active material as cement admixture strength and activity at each age
The reconstructed active material meets the quality technical requirements of S95-grade slag powder in the national standard GB/T18046-2017. The content of fCaO in the reconstituted active material is as low as 0.12%, and the reconstituted active material has no stability application risk and can be safely and reliably applied to the field of building materials.
Through the embodiments 1 to 3, the invention adopts the modifier, the modification process and the product which utilize the whole solid waste to carry out the reduction of the molten steel slag iron and the component reconstruction thereof, the raw material of the modifier is composed of a large amount of industrial solid waste, according to the difference of the moisture content and the granularity of the raw material of the modifier, the modifier is obtained after selective drying and crushing treatment, and then uniform mixing and granulation. The modifier and the molten steel slag discharged by the converter are subjected to reduction and reconstruction reaction to prepare two products of molten iron and a reconstructed active material. The molten iron has low impurity content and can be recycled for steelmaking, the content of the reconstituted active material fCaO is as low as below 0.2%, and no stability risk exists, and when 50% of the cement usage amount is replaced according to a national standard method, the 7d strength activity index is more than 70%, and the 28d strength index is more than 95%. The reconstructed active material obtained by the modification process meets the standard of S95-grade slag powder in GB/T18046-2017.
In summary, the invention provides a modifier, a modification industrial method and a product for molten steel slag iron reduction and component reconstruction by using total solid wastes, wherein the modifier is a total solid waste type modifier prepared by bulk industries such as red mud, iron tailings, coal gangue and the like, and is added into a modifying furnace to complete reduction reconstruction reaction with molten steel slag of a converter through drying, crushing, uniformly mixing, granulating and other processes, so as to realize iron material layering and iron discharging and discharging treatment, and obtain two products of molten iron for steel making and a reconstructed active material. Compared with the prior steel slag treatment process, the invention reduces the iron phase of the converter steel slag into molten iron, the gain factor omega of iron resources is more than 2, the slag phase of the converter steel slag is converted into a reconstructed active material, and the building material treatment with high activity and zero stability risk is realized. The invention utilizes the solid waste to treat the solid waste and also realizes the synergistic digestion of the solid waste in multiple industries.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (5)
1. The full-solid waste modifier for reduction and reconstruction of molten steel slag is characterized by comprising the following components in parts by weight: the full-solid waste modifier for the reduction and reconstruction of the molten steel slag comprises: the modifier is a mixture composed of industrial solid wastes, and comprises one or more of large industrial solid waste red mud, electrolytic aluminum ash, fly ash, waste soil, carbide slag, iron tailings, electrolytic waste graphite and coal gangue, and the modifier comprises the following main chemical components in percentage by weight: SiO 22 3％-95％、Al2O3 5％-85％、CaO 0.1％-70％、C 5％-20％。
2. A full-solid waste modification process for reduction and reconstruction of molten steel slag is characterized by comprising the following steps: the full-solid waste modification process for reduction and reconstruction of the molten steel slag comprises the following steps: firstly, one or more of large industrial solid waste red mud, electrolytic aluminum ash, fly ash, waste soil, carbide slag, iron tailings, electrolytic waste graphite and coal gangue are used, when the moisture and the granularity of the modifier raw material do not satisfy the moisture content of less than or equal to 1.5 percent and the granularity of less than 0.5mm, the modifier raw material is dried and crushed at the drying temperature of 120-500 ℃, the dried and crushed material and other modifier raw materials with the moisture content of less than or equal to 1.5 percent and the granularity of less than 0.5mm enter a mixer together to be mixed uniformly, and the mixed material is granulated by a granulator to form a finished granular modifier.
3. The process of claim 2, wherein the molten steel slag is subjected to reduction and reconstruction to obtain a total solid waste, and the process comprises the following steps: the raw materials of the modifier which can be directly fed into the mixer meet the requirements that the water content is less than or equal to 1.5 percent and the granularity is less than 5 mm; the water content of the dried and crushed material is less than or equal to 1.5 percent, and the granularity is less than 5 mm; the water content of the finished modifier is less than or equal to 1.5%, and the granularity is less than 15 mm.
4. The process of claim 2, wherein the molten steel slag is subjected to reduction and reconstruction to obtain a total solid waste, and the process comprises the following steps: the full-solid waste modification process for the reduction and reconstruction of the molten steel slag further comprises the following steps:
(1) receiving slag and feeding materials: receiving molten steel slag of the converter, conveying the molten steel slag into a modifying furnace, adding a finished modifying agent into the modifying furnace according to the proportion of 5-35% during the feeding period, and carrying out reduction and reconstruction reaction, wherein the temperature of a molten pool in the modifying furnace is more than or equal to 1500 ℃ and is kept for more than 30 min;
(2) tapping and deslagging: after the reduction and reconstruction reaction is finished, two products of molten iron and reconstructed active materials are formed, the molten iron is discharged from the bottom of the modification furnace, and the reconstructed active materials are discharged from the side part of the modification furnace;
(3) cooling and granulating the reconstructed active material, and recycling molten iron for converter steelmaking: transporting the discharged reconstituted active material to a cooling granulation facility for treatment; the molten iron is recycled to the converter to be used as a steelmaking raw material.
5. A full solid waste modified process product for reduction and reconstruction of molten steel slag is characterized in that: the full-solid waste modified process product of the reduction and reconstruction of the molten steel slag meets the following conditions:
(1) the molten iron components meet the condition that the TFe content is more than or equal to 92 percent, the TFe reduced recovery rate theta of the converter molten steel slag is more than or equal to 95 percent, and the iron resource gain factor omega is more than or equal to 2.0;
(2) the chemical components of the reconstructed active material satisfy that the TFe content is less than or equal to 1.5 percent and the fCaO content of the reconstructed active material is less than or equal to 0.2 percent in percentage by weight.
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| CN113735467A (en) * | 2021-08-12 | 2021-12-03 | 河北工程大学 | Modified steel slag and preparation method and application thereof |
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| CN114644465A (en) * | 2022-05-18 | 2022-06-21 | 河北纵横集团丰南钢铁有限公司 | Steel slag modifier and application thereof |
| CN115029488A (en) * | 2022-06-27 | 2022-09-09 | 北京崎基环保科技有限公司 | Steel slag treatment system and method for treating steel slag by using same |
| CN115301716A (en) * | 2022-10-08 | 2022-11-08 | 淄博益海环保科技有限公司 | Comprehensive utilization process for solid waste of red mud, fly ash, steel slag and coal gangue |
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| CN113735467A (en) * | 2021-08-12 | 2021-12-03 | 河北工程大学 | Modified steel slag and preparation method and application thereof |
| CN113979655A (en) * | 2021-12-23 | 2022-01-28 | 中铁建设集团有限公司 | Modified steel slag based on steel dust mud and red mud, and preparation method and application thereof |
| CN113979655B (en) * | 2021-12-23 | 2022-05-06 | 中铁建设集团有限公司 | Modified steel slag based on steel dust mud and red mud, and preparation method and application thereof |
| CN114644465A (en) * | 2022-05-18 | 2022-06-21 | 河北纵横集团丰南钢铁有限公司 | Steel slag modifier and application thereof |
| CN115029488A (en) * | 2022-06-27 | 2022-09-09 | 北京崎基环保科技有限公司 | Steel slag treatment system and method for treating steel slag by using same |
| CN115029488B (en) * | 2022-06-27 | 2023-10-03 | 北京崎基环保科技有限公司 | Steel slag treatment system and method for treating steel slag by adopting same |
| CN115301716A (en) * | 2022-10-08 | 2022-11-08 | 淄博益海环保科技有限公司 | Comprehensive utilization process for solid waste of red mud, fly ash, steel slag and coal gangue |
| CN115301716B (en) * | 2022-10-08 | 2023-01-17 | 淄博益海环保科技有限公司 | Comprehensive utilization process for solid waste of red mud, fly ash, steel slag and coal gangue |
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