CN114410879A - Slagging method for replacing fluorite with tailings and coarse ash pellets - Google Patents
Slagging method for replacing fluorite with tailings and coarse ash pellets Download PDFInfo
- Publication number
- CN114410879A CN114410879A CN202110990943.3A CN202110990943A CN114410879A CN 114410879 A CN114410879 A CN 114410879A CN 202110990943 A CN202110990943 A CN 202110990943A CN 114410879 A CN114410879 A CN 114410879A
- Authority
- CN
- China
- Prior art keywords
- fluorite
- slagging
- coarse ash
- tailings
- replacing
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 title claims abstract description 18
- 239000010436 fluorite Substances 0.000 title claims abstract description 18
- 239000008188 pellet Substances 0.000 title claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 10
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 9
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 9
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 9
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 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 5
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 5
- 238000005453 pelletization Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 10
- 239000010959 steel Substances 0.000 abstract description 10
- 238000009628 steelmaking Methods 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000007664 blowing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- -1 fluorine ions Chemical class 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a slagging method for replacing fluorite with tailings and coarse ash pellets, which comprises the following steps of: the physical and chemical components by mass percent are as follows: TFe: 17.94%, CaO: 43.27% of SiO2：14.79%，MgO：6.98%，Al2O3: 3.17%, MnO: 2.11% and coarse ash after cold pressing and pelletizing: the physical and chemical components by mass percent are as follows: TFe: 57.56%, CaO: 26% of SiO2: 4%, MgO 6.7%, 1: 1, and replacing fluorite to carry out slagging in the smelting process. The method can realize fluorine-free steelmaking, has weak corrosion to the furnace lining, does not cause pollution to molten steel and ecological environment, and meets the requirement of sustainable development.
Description
Technical Field
The invention mainly aims to reduce the corrosion of fluorite slagging to a converter lining in the smelting process and realize the recycling of steelmaking solid waste, and particularly relates to a slagging method for replacing fluorite with tailings and coarse ash pellets.
Background
The fluorite is used for slagging in the traditional smelting process of the eight-steel 150t converter, but the furnace lining can be corroded in the fluorite slagging process, and a large amount of fluorine ions can be generated to pollute the ecological environment. In view of the adverse effect of fluorite slagging, various domestic large iron and steel enterprises try to replace fluorite with other slagging materials, the fluorite substitutes in the domestic converter smelting process mainly comprise borate or B2O3 base, CaO-Fe2O3 base, Al2O3 base, TiO2 base, MnO base and other series, and the fluoride-free slagging agents produced by various manufacturers are used in the eight-steel 150t converter tests in 2017 and 2018, but the slagging effect is poor and the cost is high.
Disclosure of Invention
The invention aims to provide a slagging method for replacing fluorite with tailings and coarse ash pellets, which can realize fluorine-free steelmaking, has weak corrosion on a furnace lining, does not cause pollution to molten steel and ecological environment and meets the sustainable development requirement.
The technical scheme adopted by the invention is as follows: a slagging method using tailings and coarse ash pellets to replace fluorite collects the tailings generated in the steel-making production process: the physical and chemical components by mass percent are as follows: TFe: 17.94%, CaO: 43.27% of SiO2：14.79％，MgO：6.98％，Al2O3: 3.17%, MnO: 2.11% and coarse ash after cold pressing and pelletizing: the physical and chemical components by mass percent are as follows: TFe: 57.56%, CaO: 26% of SiO2: 4%, MgO 6.7%, 1: 1, and melting slag instead of fluorite in the smelting process.
The slagging mechanism is as follows: the addition of the steel-making pellets can quickly improve FeO in the slag in the earlier stage of the converter, promote the melting of lime, promote the formation of slag in the initial stage and be beneficial to the dephosphorization reaction.
Melting points of the reactants at the early stage of converter blowing are shown in Table 1
TABLE 1 melting Point/. degree C.of the main reaction product in the blow front furnace
At the beginning of the blowing, the silicon is oxidized into silicon dioxide faster than the lime dissolution rate, exceeding CaO and SiO2The speed of the binding. At this time, since SiO is contained2And when high initial slag is formed rapidly and lime melting speed is limited, desiliconization is carried out firstly in the reaction, and dephosphorization reaction speed is low. Adding pellets due to the pelletsContains certain amount of FeO and Fe2O3Increasing FeO and Fe in the initial slag2O3The content of the silicon oxide meets the requirement of high oxidizability of dephosphorization, meanwhile, as shown in the reaction formula (4-2), silicon is rapidly oxidized in the initial stage, the reaction formula (2) is favorably carried out rightwards, lime is favorably melted, the temperature in the initial stage of blowing is lower, and the conditions are favorable for carrying out the dephosphorization reaction. The pellet adding method is that all the pellets are added at the beginning of blowing in the previous period, so that the slagging effect is improved, the slag fluidity is increased, and the slag steel interface reaction is promoted.
The implementation effect is as follows: 1) the method has a strong inhibiting effect on the foam slag splashing in the converter smelting process, reduces the loss of steel materials in the converting process, and simultaneously ensures the safety of personnel and equipment. 2) The slagging effect is good, the blowing process is stable, and the service life of the oxygen lance is prolonged. 3) The smelting period is shortened, and the smelting efficiency is improved. 4) The method realizes fluorine-free steelmaking, has weak corrosion to a furnace lining, does not cause pollution to molten steel and ecological environment, and meets the requirement of sustainable development. 5) The solid waste generated by steel making is comprehensively utilized, and the energy environmental protection pressure of a steel plant is reduced.
Detailed Description
A slagging method using tailings and coarse ash pellets to replace fluorite collects the tailings generated in the steel-making production process: the physical and chemical components by mass percent are as follows: TFe: 17.94%, CaO: 43.27% of SiO2：14.79％，MgO：6.98％，Al2O3: 3.17%, MnO: 2.11% and coarse ash after cold pressing and pelletizing: the physical and chemical components by mass percent are as follows: TFe: 57.56%, CaO: 26% of SiO2: 4%, MgO 6.7%, 1: 1, and melting slag instead of fluorite in the smelting process. The pellet adding method is that all the pellets are added at the beginning of blowing in the previous period, so that the slagging effect is improved, the slag fluidity is increased, and the slag steel interface reaction is promoted.
Claims (1)
1. A slagging method using tailings and coarse ash pellets to replace fluorite is characterized in that the method comprises the following steps: the physical and chemical components by mass percent are as follows: TFe: 17.94%, CaO: 43.27% of SiO2：14.79%，MgO：6.98%，Al2O3: 3.17%, MnO: 2.11% and coarse ash after cold pressing and pelletizing: the physical and chemical components by mass percent are as follows: TFe: 57.56%, CaO: 26% of SiO2: 4%, MgO 6.7%, 1: 1, and melting slag instead of fluorite in the smelting process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110990943.3A CN114410879A (en) | 2021-08-26 | 2021-08-26 | Slagging method for replacing fluorite with tailings and coarse ash pellets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110990943.3A CN114410879A (en) | 2021-08-26 | 2021-08-26 | Slagging method for replacing fluorite with tailings and coarse ash pellets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114410879A true CN114410879A (en) | 2022-04-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110990943.3A Pending CN114410879A (en) | 2021-08-26 | 2021-08-26 | Slagging method for replacing fluorite with tailings and coarse ash pellets |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114410879A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116479236A (en) * | 2023-03-15 | 2023-07-25 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111893297A (en) * | 2020-08-06 | 2020-11-06 | 河北蓝海智投环保科技有限公司 | Preparation method of cold-pressed block of converter fly ash |
-
2021
- 2021-08-26 CN CN202110990943.3A patent/CN114410879A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111893297A (en) * | 2020-08-06 | 2020-11-06 | 河北蓝海智投环保科技有限公司 | Preparation method of cold-pressed block of converter fly ash |
Non-Patent Citations (1)
| Title |
|---|
| 王富亮等: "炼钢尾渣在260t转炉的应用实践", 《鞍钢技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116479236A (en) * | 2023-03-15 | 2023-07-25 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
| CN116479236B (en) * | 2023-03-15 | 2024-05-31 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20220429 |
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