CN113846197A - Method for improving desulfurization rate of molten iron - Google Patents
Method for improving desulfurization rate of molten iron Download PDFInfo
- Publication number
- CN113846197A CN113846197A CN202010599572.1A CN202010599572A CN113846197A CN 113846197 A CN113846197 A CN 113846197A CN 202010599572 A CN202010599572 A CN 202010599572A CN 113846197 A CN113846197 A CN 113846197A
- Authority
- CN
- China
- Prior art keywords
- slag
- molten iron
- blast furnace
- aluminum oxide
- magnesium oxide
- 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.)
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 25
- 230000023556 desulfurization Effects 0.000 title claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 39
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 21
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 21
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011593 sulfur Substances 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/04—Making slag of special composition
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
A method for improving the desulfurization rate of molten iron comprises the steps of carrying out blast furnace smelting, wherein the sulfur load of the blast furnace molten iron is less than 3Kg/t (molten iron), the temperature of the blast furnace molten iron is 1450-1550 ℃, the binary basicity R2 of slag is 1.2-1.3, the content of aluminum oxide in the slag is 13-22 wt%, the content of magnesium oxide is not more than 20 wt%, and the content ratio of the magnesium oxide to the aluminum oxide is controlled to be 0.3-0.5. By adopting the method, better slag desulfurization capability can be obtained within the range of 1.2-1.3 of the binary alkalinity, so that the quality of molten iron is improved.
Description
Technical Field
The invention relates to a blast furnace smelting technology, in particular to a method for improving the desulfurization rate of molten iron.
Background
The current state of the existing blast furnace method for producing molten iron is that the quality of raw fuel is in a descending trend and the load of sulfur entering the furnace is obviously increased in order to reduce the production cost. Therefore, in order to ensure the quality of molten iron, the optimal control of the desulfurization operation in the blast furnace ironmaking process becomes key.
In the prior art, a lot of researches are carried out on blast furnace process desulfurization, and desulfurization influence factors such as furnace temperature, slag alkalinity, slag amount and the like are determined, such as Chinese patent CN201710013294, but in the prior art, no description is given for controlling the desulfurization capacity of the slag by alumina and the furnace temperature. The practical production results show that the content of the alumina in the slag has great influence on the desulfurization capacity and effect of the slag.
In addition, although the prior literature researches the influence of high alumina in the blast furnace slag on desulfurization, the corresponding binary basicity is only below 1.2. The binary basicity of the water R2,for CaO and SiO in slag2The weight percentages of the two components are divided (CaO/SiO)2) The value obtained. And the binary alkalinity in actual operation is often over 1.2, so that the research on the optimized slag-blending desulfurization method under the binary alkalinity of 1.2-1.3 has great significance for improving the quality of molten iron.
Disclosure of Invention
The invention aims to provide a method for improving the molten iron desulphurization rate, which can obtain better slag desulphurization capability within the range of 1.2-1.3 of binary alkalinity so as to improve the molten iron quality.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for improving the desulfurization rate of molten iron comprises the steps of carrying out blast furnace smelting, wherein the sulfur load of the blast furnace molten iron is less than 3Kg/t (molten iron), the temperature of the blast furnace molten iron is 1450-1550 ℃, the binary basicity R2 of slag is 1.2-1.3, the content of aluminum oxide in the slag is 13-22 wt%, the content of magnesium oxide is not more than 20 wt%, and the content ratio of the magnesium oxide to the aluminum oxide is controlled to be 0.3-0.5.
Preferably, the binary basicity R2 of the slag is 1.2-1.25, and the weight ratio of magnesium oxide to aluminum oxide in the slag is controlled to be 0.4-0.5.
Preferably, the binary basicity R2 of the slag is more than 1.25 and less than or equal to 1.3, and the weight ratio of magnesium oxide to aluminum oxide in the slag is controlled as follows: 0.3 or more and less than 0.4.
In the method for improving the desulfurization rate of molten iron, when the binary basicity of the slag is 1.2-1.25 and the weight ratio of magnesium oxide to aluminum oxide in the slag is controlled to be 0.4-0.5, a better desulfurization effect can be obtained. It is because: the weight ratio of magnesium oxide to aluminum oxide is controlled between 0.4 and 0.5, which is equivalent to the increase of alkalinity. More importantly, at the same time, the viscosity is relatively low, and the desulfurization kinetic conditions are improved.
When the binary basicity of the slag is more than 1.25 and less than or equal to 1.3, the weight ratio of magnesium oxide and aluminum oxide in the slag is controlled as follows: a desulfurization effect can be improved by not less than 0.3 and not more than 0.4. Under such conditions, the basicity is already high, and at this time, the ratio of the weight of magnesium oxide to that of aluminum oxide is controlled to be not less than 0.3 and less than 0.4, so that good slag fluidity can be obtained, and desulfurization is facilitated.
The invention has the beneficial effects that:
by adopting the method, when the binary basicity of the slag is 1.2-1.3, the weight ratio of magnesium oxide to aluminum oxide in the slag is controlled to be 0.3-0.5, and the average desulfurization efficiency is improved by 8.68% compared with the weight ratio of magnesium oxide to aluminum oxide in the slag which is controlled to be 0.2-0.3; compared with the slag in which the weight ratio of magnesium oxide to aluminum oxide is controlled to be 0.5-0.6, the average desulfurization efficiency is improved by 8.76%.
By adopting the method, when the binary basicity of the slag is 1.2-1.25, the weight ratio of magnesium oxide to aluminum oxide in the slag is controlled to be 0.4-0.5, and compared with the weight ratio of magnesium oxide to aluminum oxide in the slag which is controlled to be 0.3-0.4, the average desulfurization efficiency is improved by 4.2%.
By adopting the method, when the binary basicity of the slag is more than 1.25 and less than or equal to 1.3, the weight ratio of magnesium oxide to aluminum oxide in the slag is controlled as follows: more than or equal to 0.3 and less than 0.4, and the average desulfurization efficiency is improved by 4.19 percent compared with the weight ratio of magnesium oxide to aluminum oxide in the slag controlled between 0.4 and 0.5.
Detailed Description
The present invention will be further described with reference to the following examples.
The examples of the present invention refer to table 1, which shows that in the blast furnace smelting, the sulfur load in the blast furnace molten iron, the temperature of the blast furnace molten iron, and the binary basicity R2 of the slag are 1.2 to 1.3, and the ratio of the alumina content, the magnesia-alumina content, and the corresponding average desulfurization efficiency.
TABLE 1
Claims (3)
1. A method for improving the desulfurization rate of molten iron comprises the steps of carrying out blast furnace smelting, wherein the sulfur load of the blast furnace molten iron is less than 3Kg/t (molten iron), the temperature of the blast furnace molten iron is 1450-1550 ℃, the binary basicity R2 of slag is 1.2-1.3, the content of aluminum oxide in the slag is 13-22 wt%, the content of magnesium oxide is not more than 20 wt%, and the content ratio of the magnesium oxide to the aluminum oxide is controlled to be 0.3-0.5.
2. The method according to claim 1, wherein the binary basicity of the slag R2 is 1.2-1.25, and the weight ratio of magnesium oxide to aluminum oxide in the slag is controlled to 0.4-0.5.
3. The method for improving the desulfurization rate of molten iron according to claim 1, wherein the binary basicity R2 of the slag is greater than 1.25 and not greater than 1.3, and the weight ratio of magnesium oxide to aluminum oxide in the slag is controlled as follows: 0.3 or more and less than 0.4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010599572.1A CN113846197A (en) | 2020-06-28 | 2020-06-28 | Method for improving desulfurization rate of molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010599572.1A CN113846197A (en) | 2020-06-28 | 2020-06-28 | Method for improving desulfurization rate of molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113846197A true CN113846197A (en) | 2021-12-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010599572.1A Pending CN113846197A (en) | 2020-06-28 | 2020-06-28 | Method for improving desulfurization rate of molten iron |
Country Status (1)
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| CN (1) | CN113846197A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243882A (en) * | 1998-08-03 | 2000-02-09 | 冶金工业部鞍山热能研究院 | Low-basicity less-slag iron smelting technology for blast furnace with external desulfurizing greatly of molten iron |
| CN102864258A (en) * | 2012-10-08 | 2013-01-09 | 武汉钢铁(集团)公司 | Method or improving properties of blast furnace slag |
| CN102888474A (en) * | 2012-09-26 | 2013-01-23 | 武汉钢铁(集团)公司 | Method for controlling aluminum oxide in first furnace blow-in slag of blast furnace |
| CN102978312A (en) * | 2012-12-13 | 2013-03-20 | 四川省川威集团有限公司 | Blast furnace smelting process used for high-vanadium-titanium low-MgO furnace slag |
| CN106555020A (en) * | 2015-09-30 | 2017-04-05 | 上海梅山钢铁股份有限公司 | A kind of method for improving blast-furnace slag performance |
| CN106702051A (en) * | 2017-01-09 | 2017-05-24 | 唐山钢铁集团有限责任公司 | Method for improving desulphurization efficiency of blast-furnace slag |
-
2020
- 2020-06-28 CN CN202010599572.1A patent/CN113846197A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243882A (en) * | 1998-08-03 | 2000-02-09 | 冶金工业部鞍山热能研究院 | Low-basicity less-slag iron smelting technology for blast furnace with external desulfurizing greatly of molten iron |
| CN102888474A (en) * | 2012-09-26 | 2013-01-23 | 武汉钢铁(集团)公司 | Method for controlling aluminum oxide in first furnace blow-in slag of blast furnace |
| CN102864258A (en) * | 2012-10-08 | 2013-01-09 | 武汉钢铁(集团)公司 | Method or improving properties of blast furnace slag |
| CN102978312A (en) * | 2012-12-13 | 2013-03-20 | 四川省川威集团有限公司 | Blast furnace smelting process used for high-vanadium-titanium low-MgO furnace slag |
| CN106555020A (en) * | 2015-09-30 | 2017-04-05 | 上海梅山钢铁股份有限公司 | A kind of method for improving blast-furnace slag performance |
| CN106702051A (en) * | 2017-01-09 | 2017-05-24 | 唐山钢铁集团有限责任公司 | Method for improving desulphurization efficiency of blast-furnace slag |
Non-Patent Citations (3)
| Title |
|---|
| 张峰等: "钙处理对无取向硅钢中非金属夹杂物的影响", 《特殊钢》 * |
| 许仁泽等: "京唐高炉渣性能评价及低镁渣性能分析", 《中国冶金》 * |
| 许满兴 等: "《铁矿石优化配矿实用技术》", 31 May 2017, 冶金工业出版社 * |
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Application publication date: 20211228 |
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