CN102876842A - Premelting slugging desulfurizer taking 12 CaO*7Al2O3 and 3CaO*5Al2O3 as main phases - Google Patents
Premelting slugging desulfurizer taking 12 CaO*7Al2O3 and 3CaO*5Al2O3 as main phases Download PDFInfo
- Publication number
- CN102876842A CN102876842A CN2012102260625A CN201210226062A CN102876842A CN 102876842 A CN102876842 A CN 102876842A CN 2012102260625 A CN2012102260625 A CN 2012102260625A CN 201210226062 A CN201210226062 A CN 201210226062A CN 102876842 A CN102876842 A CN 102876842A
- Authority
- CN
- China
- Prior art keywords
- cao
- premelting
- slugging
- desulfurizer
- 3cao
- 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
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Classifications
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- Y02W30/54—
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a premelting slugging desulfurizer taking 12 CaO*7Al2O3 and 3CaO*5Al2O3 as main phases as well as a manufacturing method of the premelting slugging desulfurizer. The phase of the desulfurizer is characterized by containing 40 to 70% of 12 CaO*7Al2O3 and 20 to 50% of 3CaO*5Al2O3, is suitable for steelmaking and refining in the metallurgy field, and is mainly used for prompting slugging and desulfurizing of molten steel; and the main raw resources for producing the desulfurizer are Ca-contained waste resources and Al2O3-contained industrial wastes, which are heated in a kiln to 1,500 to 1,700 DEG C for premelting after being ground and mixed uniformly and are condensed and broken to prepare the product finally.
Description
Technical field:
The present invention is applicable to field of metallurgy, is mainly used in the liquid steel refining operation, carries out the change slag of molten steel and carries out desulfurization.
Technical background:
In steelmaking process, for removing the sulphur impurity in the molten steel, use the slag charge as main component with CaO.For reducing cost and reducing the slag generating capacity, need to add the small amount residue material to improve processing efficiency.There is the low problem of solvability (scorification) untoward reaction in these materials.Be head it off, the general employing added the 17th group element compound (fluorochemical etc.) improvement slag at present.But use the 17th group element compound, although can reach the purpose of improving CaO scorification, can make fire-resistant damage in the refining furnace.Up to the present most technician as the above typical example of enumerating, adopts 17 group element compounds or Al
2O
3, reveal (liquid fraction under same temperature increases) with the eutectic that reaches average composition, but give an example, such as containing 48 gram CaO and 52 gram Al
2O
3Mixture and 100 the gram 12CaO7Al
2O
3Compound compares, and both average group Chengdu is CaO18%, AL
2O
372%, but both are carried out in the situation of instant heating to 1500 ℃, the former must wait until CaO and Al
2O
3Carry out solubilizing reaction, and the latter compares with the former and can form rapidly solution because fusing point only has 1455 ℃, this shows with average composition compares, and the state of phase has a significant impact reactivity.About the viewpoint of phase, only the surface at calcium oxide particle is described with the refining solvent technology that calcium aluminate covers in the report, but has just adopted a large amount of 12CaO7Al
2O
3With a small amount of 3CaO5Al
2O
3The statement of mixture, both concrete compositions of proportions are not stipulated.Explaining as above, improving on the CaO scorification performance, is necessary obligato to the consideration of thing phase, in the technology before this, finger subject matter phase ratio that should conduct is not provided clear and definite regulation.
The problem that invention will solve:
The present invention is the consume that neither increases refractory body, and does not reduce again under the condition of affinability, to solve the bad problem of scorification of CaO, can realize high efficiency liquid steel refining.
Case study on implementation:
Carry out the molten steel desulfurizing test at 150 tons of LF.The molten steel temperature of packing into is 1550-1570 ℃, and S concentration is 0.030-0.035% in the molten steel, average Argon intensity 80-100m
3/ h.Sweetening effectiveness is summed up.
The usage quantity of pre-molten slag sweetening agent is with required pre-molten slag sweetening agent quality (kg) statement of 1 ton of molten steel of every production in this test.The granularity of pre-molten slag sweetening agent adopts 5-30mm, and the CaO content in the lime is 95%, and all the other are impurity,
At this 12CaO7Al
2O
3With C12A7 statement and 3CaO5Al
2O
3Use C3A5, the mass concentration of these thing phases use RXD analyzes to send out and measures in addition.
Test-results:
Pre-molten slag sweetening agent manufacture method:
Adopting powdered lime waste material and discarded aluminum oxide is main raw material, after it is mixed, with the making method that adopts kiln to carry out fritting.According to following 1)～4) condition make and can produce refining slag of the present invention.
1) granularity of used lime or waste alumina need be made below the 3mm.
2) the mol ratio of the Ca in the raw material, Al is between 2.5～1.0.
When 3) raw material being mixed, need first used lime or aluminum oxide to be carried out fragmentation, mixing with high-speed stirring mixer.
4) with raw material molten production the in 1500～1700 ℃ of smelting furnaces that mixes.
5) discharging is crushed to and needs granularity after the fritting.
Claims (5)
1. to contain the 12CaO7Al more than 40～70% quality
2O
3Phase and 20～50% 3CaO5Al
2O
3Phase is the pre-molten slag sweetening agent of feature.
2. the above-mentioned above 12CaO7Al of 40～70% quality that contains
2O
3Phase and 20～50% 3CaO5Al
2O
3Phase is that the pre-molten slag sweetening agent of feature contains the SiO below 15%
2Or MgO, the pre-molten slag sweetening agent that perhaps both contains.
3. above-mentioned pre-melted refining slag adopts and contains the Ca scrap feed material and contain Al
2O
3Waste production.
4. will in 1500～1700 ℃ of smelting furnaces, carry out melt production behind the above-mentioned substance mixing.
5. any pre-molten dephosphorization agent of above-mentioned 1～4 method of carrying out the desulfurization of molten steel slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102260625A CN102876842A (en) | 2012-06-28 | 2012-06-28 | Premelting slugging desulfurizer taking 12 CaO*7Al2O3 and 3CaO*5Al2O3 as main phases |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102260625A CN102876842A (en) | 2012-06-28 | 2012-06-28 | Premelting slugging desulfurizer taking 12 CaO*7Al2O3 and 3CaO*5Al2O3 as main phases |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102876842A true CN102876842A (en) | 2013-01-16 |
Family
ID=47478352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102260625A Pending CN102876842A (en) | 2012-06-28 | 2012-06-28 | Premelting slugging desulfurizer taking 12 CaO*7Al2O3 and 3CaO*5Al2O3 as main phases |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102876842A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103849713A (en) * | 2014-03-19 | 2014-06-11 | 武汉钢铁(集团)公司 | Refining slag for 20 Cr structural alloy steel and preparation method thereof |
| CN103849712A (en) * | 2014-03-19 | 2014-06-11 | 武汉钢铁(集团)公司 | Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof |
| CN115627322A (en) * | 2022-10-31 | 2023-01-20 | 河南少林特材有限公司 | Desulfurizer for RH furnace and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906313A (en) * | 2003-12-24 | 2007-01-31 | 拉法尔热公司 | Steel desulphurating agent and use thereof in the desulphuration of steel |
-
2012
- 2012-06-28 CN CN2012102260625A patent/CN102876842A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906313A (en) * | 2003-12-24 | 2007-01-31 | 拉法尔热公司 | Steel desulphurating agent and use thereof in the desulphuration of steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103849713A (en) * | 2014-03-19 | 2014-06-11 | 武汉钢铁(集团)公司 | Refining slag for 20 Cr structural alloy steel and preparation method thereof |
| CN103849712A (en) * | 2014-03-19 | 2014-06-11 | 武汉钢铁(集团)公司 | Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof |
| CN115627322A (en) * | 2022-10-31 | 2023-01-20 | 河南少林特材有限公司 | Desulfurizer for RH furnace and preparation method thereof |
| CN115627322B (en) * | 2022-10-31 | 2023-12-12 | 河南少林特材有限公司 | Desulfurizing agent for RH furnace and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130116 |