CN1664119A - Slag from aluminum smelting for making clean steel and method for preparing same - Google Patents
Slag from aluminum smelting for making clean steel and method for preparing same Download PDFInfo
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- CN1664119A CN1664119A CN 200510024763 CN200510024763A CN1664119A CN 1664119 A CN1664119 A CN 1664119A CN 200510024763 CN200510024763 CN 200510024763 CN 200510024763 A CN200510024763 A CN 200510024763A CN 1664119 A CN1664119 A CN 1664119A
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Abstract
The invention relates to the steel-smelting technology field, and in a more accurate way it is a neutral aluminium slag used in steel-smelting and refining and the preparing method. The neutral aluminium slag is used in the clean steel-melting, and the character is that it is comprised with the following substance and with their proportion wy weight is: aluminum powder, 23-27; fluorite, 10-22%; remelting slag, 30-40%; carbonate, 8-15% and reducer, 3-8%. The invention is characterized by the simple preparing method, the good practicability of product, the easy manipulation of the process, the good reducing power to the ladle and steel slag, the good heat-retaining power of the surface of steel liquid. The neutral aluminium slag is added in the ladle after the tapping of steel liquid, the adding quantity is 3-5kg/t.s, and the ferric oxide content in the ladle can be decreased to below 10%, and can be at an extreme level: 1-3%, the alkalinity can reach to 4-6. The T[O] content in the steel dealt with molten steel can reach to lower than 50ppm, and the extreme low content can reach to 30ppm. There is no pollution in the production area and the purity of steel is improved.
Description
[ technical field]
The invention relates to the technical field of steelmaking, in particular to medium aluminum slag for steelmaking refining and a preparation method thereof.
[ background art]
In the external refining process of steel making, molten steel is discharged from a primary smelting furnace such as a smelting furnace or an electric furnace and enters a ladle, and then the molten steel is subjected to deoxidation, desulfurization, inclusion removal and other treatment, so that the purity of the steel is improved, and the quality requirement of a user is met. However, reoxidation of the steel and of the dissolved alloy may occur in the ladle, in the tundish and in the continuous casting mould, or during each transfer operation, which adversely affects the final purity in the steel.
[ summary of the invention]
The invention aims to provide medium aluminum-aluminum slag particularly suitable for smelting pure steel or ultra-pure steel and a preparation method thereof. The invention is mainly used for adsorbing, mixing, reducing the oxidability of ladle slag and improving alkalinity so as to achieve the aim of improving the purity of molten steel, therefore, the invention has the following functions: 1. the method has the function of reducing the ladle slag; 2. the alkalinity of the ladle slag can be improved; 3. has good spreadability and high reaction capability at high temperature; 4. can reduce the pollution to the environment.
In order to realize the purpose, the medium aluminum-aluminum slag for smelting the pure steel is designed, which is characterized by comprising aluminum powder, fluorite, pre-melted slag, carbonate and a reducing agent, and the medium aluminum-aluminum slag is prepared from the following components in percentage by weight: 23-27% of aluminum powder, 10-22% of fluorite, 30-40% of premelting slag, 8-15% of carbonate and 3-8% of reducing agent.
Wherein the aluminum powder is used as a reducing agent to reduce FeO in the oxidizing slag and reduce the oxidizing property of the slag. The reaction is as follows: 。
wherein fluorite is mainly used as a slagging agent to improve the fluidity of slag and ensure that the slag has good reaction kinetic conditions.
CaCO3Carbonate such as raw dolomite, high temperature is heated and decomposed to produce gas, improves the reactivity of sediment, makes it evenly spread on the ladle face, and the decomposition reaction is:
the pre-melted slag is composed of calcium oxide, aluminum oxide, silicon dioxide and magnesium oxide, and is prepared from the following components in percentage by weight: 48-52% of CaO, Al2O338-42％，SiO20-6.0％，MgO 5.0-7.0％。
The premelting slag can improve the alkalinity, improve the fluidity and reduce the addition of fluorite, and is beneficial to the environment and steel ladle refractory materials.
The reducing agent adopts SiC or CaSi or other materials, and has the functions of: the reducing capability of the steel ladle top slag is improved, the oxidability of the steel ladle top slag is further reduced, and the reaction is as follows:
the preparation method of the medium aluminum-aluminum slag comprises the following steps: the raw materials are crushed and sieved, weighed according to the proportion, uniformly stirred, added with a binder, uniformly stirred, rolled into powder, dried and formed.
Theinvention has the advantages of simple preparation method, good practicability of finished products, simple and convenient process operation, good reduction capability on ladle top slag and good molten steel surface heat preservation performance, the medium aluminum slag is added into a ladle after molten steel tapping, the addition amount is 3-5kg/t.s, and FeO in the ladle slag can be reduced to below 10 percent and can reach 1-3 percent in an extremely low way, and the alkalinity can reach 4-6 percent after the medium aluminum slag is added. The content of T [ O]in steel after molten steel refining treatment can be up to below 50PPm, and the extremely low content can be up to 30 PPm. The on-site environment is not polluted, and the purity of the molten steel is improved.
[ detailed description of the invention]
Example 1
Component (weight)
23 percent of aluminum powder
Fluorite 22%
Pre-melted slag 35%
Raw dolomite 15%
CaSi 5％
Example 2
Component (weight)
27 percent of aluminum powder
10 percent of fluorite
Pre-melted slag 40%
Raw dolomite 15%
CaSi 8％
Example 3
Component (weight)
23.8 percent of aluminum powder
18.8 percent of fluorite
Premelting slag of 37.7 percent
CaCo314.7％
SiC 5.0％
After the medium aluminum slag prepared by the formula is added according to the amount of 3.0kg/t.s, the obtained result is as follows:
adding T-Fe in the steel ladle slag before adding: 26.5
Adding T-Fe in the steel ladle slag: 8.5
Basicity of ladle slag: 4.3
T [ O]in the steel after refining: 45ppm of
Example 4
Component (weight)
25.9 percent of aluminum powder
17.9 percent of fluorite
39.2 percent of premelting slag
Raw dolomite of 9.2 percent
CaSi 7.8％
After the medium aluminum slag prepared by the formula is added according to the amount of 3.4kg/t.s, the obtained result is as follows:
adding T-Fe in the steel ladle slag before adding: 23.8
Adding T-Fe in the steel ladle slag: 6.3
Basicity of ladle slag: 4.7
T [ O]in the steel after refining: 41ppm of
Example 5
Component (weight)
26.7 percent of aluminum powder
16.8 percent of fluorite
36.9 percent of premelting slag
11.9 percent of raw dolomite
SiC 7.7％
After the medium aluminum slag prepared by the formula is added according to the amount of 4.7kg/t.s, the obtained result is as follows:
adding T-Fe in the steel ladle slag before adding: 29.8
Adding T-Fe in the steel ladle slag: 3.1
Basicity of ladle slag: 5.2
T [ O]in the steel after refining: 35 ppm.
Claims (6)
1. The medium aluminum-aluminum slag for smelting pure steel is characterized by comprising aluminum powder, fluorite, premelting slag, carbonate and a reducing agent, and the medium aluminum-aluminum slag comprises the following components in parts by weight: 23-27% of aluminum powder, 10-22% of fluorite, 30-40% of premelting slag, 8-15% of carbonate and 3-8% of reducing agent.
2. The medium aluminum-aluminum slag for smelting pure steel according to claim 1, which is characterized by comprising aluminum powder, fluorite, premelted slag and other substances, and is prepared from the following components in parts by weight: 26.7% of aluminum powder, 16.8% of fluorite, 36.9% of premelting slag, 11.9% of carbonate and 7.7% of reducing agent.
3. The medium aluminum slag for smelting pure steel according to claim 1, wherein the pre-melted slag is composed of calcium oxide, aluminum oxide, silicon dioxide and magnesium oxide, and is prepared from the following components in parts by weight: 48-52% of CaO, Al2O338-42％，SiO20-6.0％，MgO 5.0-7.0％。
4. The medium aluminum slag for smelting pure steel according to claim 1, wherein the reducing agent is SiC or CaSi.
5. The medium Al-Al slag for smelting pure steel as claimed in claim 1, wherein the carbonate used is CaCO3And raw dolomite.
6. The method for preparing medium aluminum and aluminum slag for smelting pure steel according to claim 1, wherein the raw materials are crushed, sieved, proportioned and weighed, uniformly stirred, added with a binder, uniformly mixed, rolled into balls, dried and formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100247630A CN1324150C (en) | 2005-03-30 | 2005-03-30 | Slag from aluminum smelting for making clean steel and method for preparing same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100247630A CN1324150C (en) | 2005-03-30 | 2005-03-30 | Slag from aluminum smelting for making clean steel and method for preparing same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1664119A true CN1664119A (en) | 2005-09-07 |
| CN1324150C CN1324150C (en) | 2007-07-04 |
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| CNB2005100247630A Expired - Fee Related CN1324150C (en) | 2005-03-30 | 2005-03-30 | Slag from aluminum smelting for making clean steel and method for preparing same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876850A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Pre-melting slag former for steel production and production method thereof |
| CN108018398A (en) * | 2016-10-28 | 2018-05-11 | 上海梅山钢铁股份有限公司 | A kind of ladle top slag for ultra-low-carbon steel deoxidation modification agent and its application method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5163309A (en) * | 1974-04-23 | 1976-06-01 | Japan Steel Works Ltd | Io rin sansoto no ganjuryo no sukunai ko no seizoho |
| CN1056415C (en) * | 1998-04-07 | 2000-09-13 | 幸超 | Aluminium-contained premelting slag and preparation method therefor, and molten steel desulfurizer and purifier containing same |
| CN1186465C (en) * | 2002-10-17 | 2005-01-26 | 江苏江南铁合金有限公司 | Aluminium slag ball and its preparation method |
-
2005
- 2005-03-30 CN CNB2005100247630A patent/CN1324150C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876850A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Pre-melting slag former for steel production and production method thereof |
| CN108018398A (en) * | 2016-10-28 | 2018-05-11 | 上海梅山钢铁股份有限公司 | A kind of ladle top slag for ultra-low-carbon steel deoxidation modification agent and its application method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1324150C (en) | 2007-07-04 |
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Granted publication date: 20070704 Termination date: 20100330 |