CN116042963A - Method for preparing refining slag former from casting residues - Google Patents

Method for preparing refining slag former from casting residues Download PDF

Info

Publication number
CN116042963A
CN116042963A CN202211635818.1A CN202211635818A CN116042963A CN 116042963 A CN116042963 A CN 116042963A CN 202211635818 A CN202211635818 A CN 202211635818A CN 116042963 A CN116042963 A CN 116042963A
Authority
CN
China
Prior art keywords
slag
casting
refining slag
slag former
preparing
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
Application number
CN202211635818.1A
Other languages
Chinese (zh)
Inventor
周伟
王建
吴国荣
常智渊
郑昊青
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Original Assignee
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd filed Critical Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Priority to CN202211635818.1A priority Critical patent/CN116042963A/en
Publication of CN116042963A publication Critical patent/CN116042963A/en
Pending legal-status Critical Current

Links

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
    • 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
    • C21C7/076—Use of slags or fluxes as treating agents
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • 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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
    • 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

Abstract

The invention discloses a method for preparing a refining slag former from casting residues, and relates to the technical field of steel manufacturing. The method for preparing the refining slag former from the casting residues comprises the following steps: (1) casting residues are selected as sedative steel casting residues. (2) The selected casting residues are crushed and then subjected to magnetic separation to remove metal iron and control FeO within 5 percent. The components of the refining slag former are as follows: 40-50% of casting residue after magnetic separation, 25-35% of calcium carbonate, 1-2% of industrial salt and 15-25% of silicon residue (8-10% of elemental silicon and SiO) 2 :80-90%, and the balance of impurity elements), wherein the molding binder is 0.5% -1.5% of the total mass of the main raw materials; (4) Dry mixing, and preparing a pellet blank by adopting a strong ball press machine for dry ball pressing; screening, and selecting pellet billets with the particle size of more than 10mm to prepare the refining slag former. The invention realizes the comprehensive utilization of secondary resources, and is the same asThe aim of improving the condition that the lime and fluorite slag is slow and the effect is unstable at present is fulfilled.

Description

Method for preparing refining slag former from casting residues
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a method for manufacturing a refining slag former from casting residues.
Background
The refining slag system at the present stage mainly comprises CaO-Al 2 O 3 Based on, caO-SiO 2 The two groups are represented. CaO-Al 2 O 3 The slag system has many metallurgical properties for external refining, among which: 1) The alkalinity is high; 2) The desulfurization capability is strong; 3) The oxygen potential is low, and the diffusion deoxidization effect can be achieved; 5) The capability of absorbing inclusion is strong; 6) The catalyst does not contain fluorine or contains low fluorine, and is suitable for the requirements of refining rapid operation and environmental protection. CaO-Al 2 O 3 The basic slag system can be used for the external refining processes such as LF, RH, VAD, VOD and the like, and can also be used as a covering of the molten steel of the tundish in the continuous casting process. From the aspects of melting point, fluidity and the like, due to the fact that it is specific to CaO and Al 2 O 3 Has strong holding capacity, so a large amount of lime, foaming agent and the like can be matched to form LF refining slag with strong desulfurization capacity. Simply because of CaO-Al 2 O 3 The base refining slag system has the advantages that the base refining slag system is widely applied to steel smelting, but has some problems: 1) The cost is high, caO-Al is adopted 2 O 3 The base refining slag system adopts premelted CaO-Al in general steelworks in order to ensure the slag forming effect of rapid melting 2 O 3 Base refining slag, the price of which is close to 3000 yuan per ton, is generally only used for producing high-quality and high-added-value products; 2) High Al content by bauxite 2 O 3 Raw materials to supplement Al in refining slag 2 O 3 The content and the cost are slightly low, but the melting effect is poor, slag melting materials such as fluorite are often required to be added, and in consideration of the environment pollution caused by fluorite and the increasingly reduced mineral deposit of fluorite, the foreign ferrous metallurgy industry basically does not use fluorite or uses fluorite rarely, but in consideration of the aspect, the application of fluorite to the ferrous metallurgy industry is expected to be limited or reduced by the related policy. Accordingly, a refining slag former using casting slag as a main material has been developed to improve this situation. After the casting residue is refined and slaked, the casting residue has the characteristic of fast melting the premelting slag into slag, and is suitable for the casting residue according to the components of the casting residueWhen partial components are added, the effective control of the steel grade components can be achieved, and the refining slag former has the advantages of rapid slag formation (secondary to premelting slag), low cost (equivalent to lime price), strong desulfurization capability and the like.
The similar patent technology mainly comprises the following items:
CN202111208386 is a resource treatment method of metallurgical slag of aluminium-iron alloy for steelmaking, and discloses a resource treatment method of metallurgical slag of aluminium-iron alloy, the slag left in aluminium-iron smelting is passed through the processes of magnetic separation and iron removal, then the alloy is separated by separation, and the residual tailings are added into limestone, coke and other materials to reduce and produce iron, at the same time calcium aluminate slag is obtained, and said slag is premelted slag, and can be used as slag for steelmaking refining. But the cost is high and the raw materials are not easily available.
CN201910228821 is a method for controlling pulverization and reuse of steelmaking refining slag, and CaO-Al is adopted on slag type refining slag with external reducibility 2 O 3 The slag system is based, the components of the refined slag are controlled, so that the refined slag comprises the following components in percentage by mass: caO 50-66%, siO 2 8％-12％、Al 2 O 3 21% -42%, 7.6% -10% of MgO and 0.7% -3% of FeO+MnO0.7%; r is equal to or greater than 4; recycling the refined slag after the components are controlled according to a steel slag cascade utilization process, or recycling the refined slag in a refining process, wherein the temperature of the refined slag is not higher than 500 ℃ in the recycling process. Although the powder of steelmaking refining slag can be effectively reduced, no additional modulating substances are needed, the recovery and the utilization of the steelmaking refining slag are facilitated, dust dispersion in the transportation process caused by the powder is prevented, and the operation environment is improved. Through the recycling of the steel slag, the consumption of slag forming materials and the discharge of slag are reduced, and the method has higher economic and environmental protection values. The method is also used for recycling casting residues, but is single, and can be used only by partially reducing residues, so that the steel grade is highly targeted, the recycling of all sedative steel grade casting residues can not be realized, and the influence on field operation is larger.
CN201110192283 is a production method of high alkalinity steelmaking refining slag, which is used for the external refining process of steelmaking, and solves the problems of lime powder hydration and slow melting of added lime blocks. Content package for the methodThe method comprises the following steps: crushing and grinding lime just burned in a lime kiln, putting the ground lime fine powder into a boiling bed with the temperature of 650-750 ℃, introducing exhaust gas and steam discharged by the lime kiln to burn the lime, and discharging CO in the exhaust gas by the lime kiln to burn the lime 2 Passivating and waterproofing the lime surface, and accelerating CO by using steam 2 And (5) passivating the lime surface. And mixing the passivated lime powder with cosolvent powder, balling by a wet method or a dry method, and sieving. Although it has the characteristics of high alkalinity, high melting speed, good spreadability, low cost and long storage time; the external refining time of the steelmaking can be shortened, and the S and P removal rate of the molten steel in the external refining process of the steelmaking can be improved; at the same time utilize the CO discharged by lime kiln to burn lime 2 Exhaust gas. However, the produced refining slag has too high alkalinity, and the slag component has limited inclusion absorption capacity and high cost.
Disclosure of Invention
The invention aims to provide a method for preparing a refining slag former from casting residues, which realizes the comprehensive utilization of secondary resources and simultaneously improves the problems of slow slag discharge and unstable effect of lime and fluorite at present.
The aim of the invention is achieved by the following technical scheme:
a method for preparing a refining slag former from casting residues comprises the following steps:
the components of the refining slag former comprise main raw materials and auxiliary materials, wherein the main raw materials comprise the following components in percentage by mass: 40-50% of cast slag after magnetic separation, 25-35% of calcium carbonate, 1-2% of industrial salt (NaCl) and 15-25% of silicon slag, wherein the silicon slag mainly regulates alkalinity and reduces the oxidizing property of the steel slag by utilizing elemental silicon, the auxiliary material is a molding binder, and the molding binder is 0.5-1.5% of the total mass of the main raw materials;
step one, dry mixing and stirring, namely mixing and stirring the main raw material dry materials for 5-7min, adding the auxiliary material forming binder dry materials, mixing and stirring for 3-5min until the mixture is uniform, and preparing a dry mixed material;
step two, adopting a strong ball pressing machine to press balls in a dry mode to prepare pellet billets with the specification (diameter) of 20-35mm;
and thirdly, screening, namely screening the pellet billets by adopting a screen with 10mm sieve holes, and selecting the pellet billets with the particle size of more than 10mm to prepare the refining slag former.
Based on the technical scheme, preferably, the casting residue is sedative steel casting residue, and comprises the following components in percentage by mass:
CaO：35-45％，SiO 2 ：25-40％，Al 2 O 3 :3-10%, feO:3-8%, mgO:7-12%, and the balance of metallic iron and impurities.
Based on the technical scheme, preferably, the casting residues are crushed, and then subjected to magnetic separation to remove metal iron and control FeO within 5 percent.
Based on the technical scheme, preferably, the granularity of the crushed casting residues is 0-3mm.
Based on the above technical scheme, preferably, the silica slag comprises the following components in percentage by mass: 8-10% of elemental silicon, siO 2 :80-90%, and the balance of impurity elements.
Based on the above technical scheme, preferably, the forming binder comprises the following components in percentage by mass: 40-60% of bentonite, 2% of sodium carboxymethyl cellulose, 10-20% of gluten and 20-30% of cement.
Based on the above technical solution, preferably, the cement is 425 cement.
The refining slag former is applied to converter tapping or refining process, and when the refining slag former is applied to converter tapping, the using amount of the refining slag former is 4-6kg/t steel; when the refining slag former is applied to the refining process, lime is added according to the desulfurization requirement, and the refining slag former is added according to the 1/2 addition; after desulfurization is completed, the refining slag former is added in an equal amount according to the addition amount of lime to adjust the binary alkalinity of the slag system; no desulfurization heat is needed to add 2-4kg/t steel of the refining slag to meet the submerged arc requirement.
The beneficial effects of the invention are as follows: the casting residue-based refining slag former realizes the recovery of all sedative steel casting residues, has easily obtained raw materials, realizes the comprehensive utilization of secondary resources by utilizing, has low cost and good slag melting condition, and simultaneously improves the conditions of slow slag discharge and unstable effect of the lime and fluorite at present.
Detailed Description
The following non-limiting examples will enable those of ordinary skill in the art to more fully understand the invention and are not intended to limit the invention in any way.
Example 1
A preparation method of a casting residue-based refining slag former comprises the following steps:
(1) The casting residue is selected as sedative steel casting residue, and comprises the following components:
CaO:40％，SiO 2 :33％，Al 2 O 3 7 percent of FeO:5%, mgO:9%, the rest is part of metallic iron and impurities.
(2) The selected casting residues are crushed and then subjected to magnetic separation to remove metal iron and control FeO within 5 percent.
(3) The components of the refining slag former are as follows: 46% of casting residues after magnetic separation, 32% of calcium carbonate, 2% of industrial salt (NaCl) and 20% of silicon residues (9% of simple substance silicon and SiO) 2 :85% and the balance of impurity elements. The alkalinity is regulated, simple substance silicon is utilized to reduce the oxidizing property of the steel slag), and the molding binder is 1% of the total mass of the main raw materials;
(4) The method also comprises the following steps:
step one, dry mixing and stirring, namely mixing and stirring the main raw material dry materials for 5-7min, adding the auxiliary material forming binder dry materials, mixing and stirring for 3-5min until the mixture is uniform, and preparing a dry mixed material;
step two, adopting a strong ball pressing machine to press balls in a dry mode to prepare pellet billets with the specification of 20-35mm;
and thirdly, screening, namely screening the pellet billets by adopting a screen with 10mm sieve holes, and selecting the pellet billets with the particle size of more than 10mm to prepare the refining slag former.
Example 2
A preparation method of a casting residue-based refining slag former comprises the following steps:
(1) The casting residue is selected as sedative steel casting residue, and comprises the following components:
CaO:45％，SiO 2 :25％，Al 2 O 3 :8％，FeO：6％MgO:10%, the rest is part of metallic iron and impurities.
(2) The selected casting residues are crushed and then subjected to magnetic separation to remove metal iron and control FeO within 5 percent.
(3) The components of the refining slag former are as follows: 50% of casting residues after magnetic separation, 28% of calcium carbonate, 1% of industrial salt (NaCl) and 21% of silicon residues (9% of simple substance silicon and SiO) 2 :85% and the balance of impurity elements. The alkalinity is regulated, simple substance silicon is utilized to reduce the oxidizing property of the steel slag), and the molding binder is 1.5% of the total mass of the main raw materials;
(4) The method also comprises the following steps:
step one, dry mixing and stirring, namely mixing and stirring the main raw material dry materials for 5-7min, adding the auxiliary material forming binder dry materials, mixing and stirring for 3-5min until the mixture is uniform, and preparing a dry mixed material;
step two, adopting a strong ball pressing machine to press balls in a dry mode to prepare pellet billets with the specification of 20-35mm;
and thirdly, screening, namely screening the pellet billets by adopting a screen with 10mm sieve holes, and selecting the pellet billets with the particle size of more than 10mm to prepare the refining slag former.
Example 3
After tapping in a converter, adding 4kg/t steel which is the refining slag former prepared in the example 1, blowing argon for 3min on a small platform, and basically melting the steel slag and having good spreadability.
According to the sulfur content (0.005%) of a small platform, the LF station does not need desulfurization treatment, only 2kg/t steel converter is added in the refining process, 2kg/t steel of the refining slag former is added after tapping, the steel slag is completely melted after 3min of heating slag melting, the spreadability is good, and the desulfurization rate is 13.7%.
Example 4
After tapping in a converter, adding 5kg/t steel which is the refining slag former prepared in the example 1, blowing argon for 4min on a small platform, and basically melting the steel slag and having good spreadability.
The LF entering station needs to desulfurize to be within 0.006 percent according to the sulfur content (0.008 percent) of the small platform, 4kg/t steel lime is added into the LF entering station for desulfurization treatment, 0.006 percent of sulfur is removed after desulfurization, 2kg/t steel is added into the LF entering station after desulfurization is completed, slag system alkalinity adjustment is carried out on the refining slag, and the desulfurization rate is 25 percent.
Example 5
After tapping in a converter, adding 6kg/t steel which is the refining slag former prepared in the example 1, blowing argon for 5min on a small platform, and basically melting the steel slag and having good spreadability.
The LF entering station needs to desulfurize to be within 0.006 percent according to the sulfur content (0.010 percent) of the small platform, 6kg/t steel lime is added into the entering station for desulfurization treatment, 0.005 percent of sulfur is removed, 3kg/t steel is added into the slag after desulfurization is finished, and slag system alkalinity is adjusted, so that the desulfurization rate is 50 percent.
Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims (7)

1. The method for preparing the refining slag former from the casting slag is characterized by comprising the following steps of:
the refining slag former comprises main raw materials and auxiliary materials, wherein the main raw materials comprise the following components in percentage by mass: 40-50% of casting residue after magnetic separation, 25-35% of calcium carbonate, 1-2% of industrial salt and 15-25% of silicon slag, wherein auxiliary materials are formed binding agents, and the formed binding agents are 0.5% -1.5% of the total mass of the main raw materials;
step one, dry mixing and stirring, namely mixing and stirring the main raw material dry materials for 5-7min, adding the auxiliary material forming binder dry materials, mixing and stirring for 3-5min until the mixture is uniform, and preparing a dry mixed material;
step two, adopting a strong ball pressing machine to press balls in a dry mode to prepare pellet billets with the specification of 20-35mm;
and thirdly, screening, namely screening the pellet billets by adopting a screen with 10mm sieve holes, and selecting the pellet billets with the particle size of more than 10mm to prepare the refining slag former.
2. The method according to claim 1, wherein the casting residue is a sedative steel casting residue comprising the following components in mass fraction:
CaO：35-45％，SiO 2 ：25-40％，Al 2 O 3 :3-10%, feO:3-8%, mgO:7-12%, and the balance of metallic iron and impurities.
3. The method according to claim 1, wherein the casting residue is crushed, and then subjected to magnetic separation to remove metallic iron and control FeO within 5%.
4. The method of claim 1, wherein the casting residue has a particle size of 0-3mm.
5. The method according to claim 1, wherein the silica slag composition is, in mass fraction: 8-10% of elemental silicon, siO 2 :80-90%, and the balance of impurity elements.
6. The method of claim 1, wherein the shaped binder component is, by mass fraction: 40-60% of bentonite, 2% of sodium carboxymethyl cellulose, 10-20% of gluten and 20-30% of cement.
7. The method of claim 1, wherein the cement is 425 cement.
CN202211635818.1A 2022-12-19 2022-12-19 Method for preparing refining slag former from casting residues Pending CN116042963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211635818.1A CN116042963A (en) 2022-12-19 2022-12-19 Method for preparing refining slag former from casting residues

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211635818.1A CN116042963A (en) 2022-12-19 2022-12-19 Method for preparing refining slag former from casting residues

Publications (1)

Publication Number Publication Date
CN116042963A true CN116042963A (en) 2023-05-02

Family

ID=86121152

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211635818.1A Pending CN116042963A (en) 2022-12-19 2022-12-19 Method for preparing refining slag former from casting residues

Country Status (1)

Country Link
CN (1) CN116042963A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116479214A (en) * 2023-06-19 2023-07-25 江苏省沙钢钢铁研究院有限公司 Synthetic slag and preparation method and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116479214A (en) * 2023-06-19 2023-07-25 江苏省沙钢钢铁研究院有限公司 Synthetic slag and preparation method and application thereof
CN116479214B (en) * 2023-06-19 2023-10-27 江苏省沙钢钢铁研究院有限公司 Synthetic slag and preparation method and application thereof

Similar Documents

Publication Publication Date Title
CN102586543B (en) Steel ladle slag reducing agent with high calcium oxide content, and preparation method thereof
CN111334644A (en) Fluorine-free refining fluxing slag melting agent and preparation and use method thereof
CN1461680A (en) Tundish covering agent for pure steel, and its making method
CN116042963A (en) Method for preparing refining slag former from casting residues
CN113122680B (en) Steel slag modifier and preparation and use methods thereof
CN101550465A (en) Manganese-based fluxing agent for converter steelmaking and preparation method thereof
CN110863077A (en) Converter steelmaking slag former and preparation method thereof
CN103031409B (en) Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace
CN111363888B (en) KR desulfurizer as well as preparation method and application thereof
CN111411193B (en) Efficient and environment-friendly KR desulfurizer and preparation method thereof
CN111575442B (en) Low-melting-point high-efficiency desulfurizing agent and preparation and application methods thereof
CN116004949A (en) Casting residue-based refining slag former
CN102864270A (en) Vanadium extraction cooling agent and preparation method thereof
JP2001348610A (en) Slag formation promoter
CN112662831A (en) Composite calcium oxide-based desulfurizer for steelmaking molten steel pretreatment and preparation method thereof
CN113278765A (en) Desulfurizing agent for converter and desulfurizing method
CN112695155A (en) Steelmaking process of molten iron containing vanadium and titanium
JPH10263768A (en) Method for reusing converter slag
JPS61194125A (en) Simultaneous treatment of sludge and steel making slag
CN113136480B (en) Ladle slag modifier and preparation and use method thereof
CN115652027B (en) LF furnace rapid slag forming composite sphere and preparation and use method thereof
CN111304399B (en) Use method of refining slag for converter smelting
CN113388716B (en) Fluorine-free composite molten iron desulfurizing agent and preparation method thereof
KR102261427B1 (en) Slag modifier with low melting point and manufacturing method thereof
CN110982989B (en) Preparation method and use method of slag condenser for molten iron pretreatment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination