CN103205523B - Novel technology for cooling through adopting stones in converter smelting - Google Patents
Novel technology for cooling through adopting stones in converter smelting Download PDFInfo
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- CN103205523B CN103205523B CN201310108687.6A CN201310108687A CN103205523B CN 103205523 B CN103205523 B CN 103205523B CN 201310108687 A CN201310108687 A CN 201310108687A CN 103205523 B CN103205523 B CN 103205523B
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Abstract
The invention relates to a novel technology for cooling through adopting stones in converter smelting. The method is characterized in that after blowing is carried out for 2-4 minutes in an early converter smelting period, when the temperature T of molten iron is not less than 1300 DEG C, dolomite, magnesium balls and lime are added to form slag, in the meanwhile, 3-12kg/t of stones are added, and converter slag and molten iron are cooled through the decomposition heat absorption of the stones; and when the temperature is quickly increased in a middle blowing period, 1-5kg/g of the stones are added for cooling, and 2-6kg/t of the stones are additionally added if a converter slag re-drying phenomenon is generated in a blowing process. The technology has the advantages that the stones are adopted for cooling in the early blowing period, so that the explosive splashing probability which is caused by the low viscosity of the converter slag after ore is added in the early smelting period is greatly reduced, the steel loss in a steel-making process is decreased, and moreover, the lime addition amount can be lowered; and the technology is contributed to phosphorus removing in an early molten iron period and uniform molten pool temperature raising, stone can be widely obtained, and the ore consumption can be reduced through adopting stones to replace the part of ore, so that the cost is lowered.
Description
Technical field
The invention belongs to ferrous metallurgy field, specifically a kind of converter smelting adopts stone cooling novel process.
Background technology
In converter steelmaking process, slagging process is main processes, and the quality of slag making effect (basicity of slag, temperature, viscosity) directly affects dephosphorization, the desulfuration efficiency of converter, affects the erosive velocity of furnace lining.In order to shorten the heat, rationally regulate temperature, accurately reach the desired phosphorus content of converter tapping terminal temperature hit rate and product, all must use cooling furnace charge by timely and appropriate discovery.
At present, the cooling furnace charge using in converter steelmaking process mainly contains ore, steel scrap, mud pelletizing, sintered material, fluorite etc., these cooling furnace charges add in converter and can occur in various degree variety of issue: 1, unfavorable adjusting smelting temperature, cause early stage, mid-term dephosphorization difficulty, extend tap to tap time, affects rhythm of production; 2, control improperly early stage, because [FeO] content in slag is higher, cinder viscosity is low, easily causes explosive splash, has increased steel flow and has undermined the resistance to material loss of furnace lining; 3, ore, steel scrap etc. are compared with stone, and cost is relatively high; Although 4, fluorite can working the slag viscosity, fluorite belongs to acid solvent, obvious to the lining erosion of converter of basic lining, shortens furnace life, increases cost, contaminate environment.
Summary of the invention
For above-mentioned problem, the invention provides one and can effectively regulate smelting temperature, reduce as required initial smelting period and mid-term temperature be beneficial to dephosphorization, reduce ore usage quantity, reduce smelting cost, reduce iron and steel loss, improve iron and steel recovery rate, reduce the pollution to environment, the cool-down method increasing production and improying productivity.
The technical solution adopted for the present invention to solve the technical problems is:
Adopt the stone composition of cooling to count by weight percentage, comprise: 70～90% CaCO
3, 5～10% MgO, 3～5% SiO
2, surplus is Al
2o
3and Fe
2o
3and inevitable impurity, and answer≤50mm of the granularity of stone.Bessemerize early stage, blow after 2～4 minutes, in the time of molten iron temperature T >=1300 DEG C, add the stone of 3～12kg/t to lower the temperature, add converter slag-making agent simultaneously, smelt mid-term, in the time that molten steel temperature rises to rapidly more than 1500 DEG C, liquid steel dephosphorization rate, lower than 80%, now adds the stone of 1～5kg/t to lower the temperature, if there is slag getting dry phenomenon in converting process, add the ore of 2～6kg/t;
Bessemerizing early stage, when molten iron [Si]≤0.4%, stone add-on is 3～5kg/t; In the time of molten iron 0.4% < [Si]≤0.6%, stone add-on is 6～8kg/t; In the time of molten iron [Si] > 0.6%, stone add-on is 9～12kg/t;
Smelt mid-term when that molten steel temperature rises is very fast, when [P] >=0.030%, add the stone of 1～5kg/t to lower the temperature and be beneficial to further dephosphorization in mid-term.
Beneficial effect of the present invention: advantage of the present invention and effect are to adopt stone to reduce bath temperature, is conducive to the molten iron removal of phosphorus in early stage and the homogeneity of initial smelting period temperature; Reduce because adding the cooling material such as ore, steel scrap to cause the probability of explosive splash, reduced loss, improved the recovery rate of molten steel; Can reduce ore consumption, reduce costs simultaneously, and stone wide material sources, cheap.This technique is compared with technique before improving, and molten steel recovery rate and ton steel profit are significantly improved, and reduce steel-making cost and can reach 1～5 yuan/ton of steel.
Embodiment
Below in conjunction with embodiment, the present invention is described further, but embodiment should not be construed as limitation of the present invention.
Use the top-blown oxygen converter that nominal capacity is 40t, smelting steel grade is 70# steel, and Production Flow Chart is: 40t converter → LF refining → CCM continuous small-billet casting (140 × 140mm), molten iron employing capacity is 480m
3small furnace produce.
In the top-blown oxygen converter that is 40t to nominal capacity, add 4t left and right steel scrap, then add the blast-melted of 38t left and right, in blast-melted, [Si] is 0.48%, molten iron temperature reaches 1350 DEG C, bessemerizing early stage, blow after 3 minutes, bath temperature rises very fast, reach rapidly more than 1500 DEG C, now, the stone that adds 6.5kg/t granularity≤50mm is to the processing of lowering the temperature of slag and molten steel, make temperature be down to 1400 DEG C of left and right, the stone simultaneously adding can increase the basicity of slag after decomposing, now be along with converter slag-making agent rhombspar adding of stone, magnesium ball, adding of lime and simultaneously adding.
Smelt mid-term when that molten steel temperature rises is very fast, when [P] reaches 0.035%, add the stone of 3kg/t lower the temperature and be beneficial to further dephosphorization in mid-term, mid-term is lower because of rifle position, occurs returning dry phenomenon, has added the content of ferric oxide in the ore increase slag of 3kg/t.And continue blowing, until converter terminal carbon reaches 0.2%, 1625 DEG C, terminal phosphorus 0.015%, tapping temperature, can tap and carry out LF external refining, continuous small-billet casting.
Claims (2)
1. converter smelting adopts a stone cooling novel process, the stone adding by weight percentage, the CaCO that its composition is 70～90%
3, 5～10% MgO, 3～5% SiO
2, surplus is Al
2o
3and Fe
2o
3and inevitable impurity, answer≤50mm of stone granularity;
Bessemerizing early stage, after blowing 2～4 minutes, in the time of molten iron temperature T >=1300 DEG C, add the stone of 3～12kg/t to lower the temperature, add converter slag-making agent simultaneously; Smelt mid-term, in the time that molten steel temperature rises to rapidly more than 1500 DEG C, liquid steel dephosphorization rate, lower than 80%, now adds the stone of 1～5kg/t to lower the temperature, if there is slag getting dry phenomenon in converting process, adds the ore of 2～6kg/t;
It is characterized in that: bessemerizing early stage, when molten iron [Si]≤0.4%, stone add-on is 3～5kg/t; In the time of molten iron 0.4% < [Si]≤0.6%, stone add-on is 6～8kg/t; In the time of molten iron [Si] > 0.6%, stone add-on is 9～12 kg/t.
2. a kind of converter smelting according to claim 1 adopts stone cooling novel process, it is characterized in that: smelt mid-term when that molten steel temperature rises is very fast, when [P] >=0.030%, add the stone of 1～5kg/t to lower the temperature and be beneficial to further dephosphorization in mid-term.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310108687.6A CN103205523B (en) | 2013-03-29 | 2013-03-29 | Novel technology for cooling through adopting stones in converter smelting |
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|---|---|---|---|
| CN201310108687.6A CN103205523B (en) | 2013-03-29 | 2013-03-29 | Novel technology for cooling through adopting stones in converter smelting |
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| CN103205523A CN103205523A (en) | 2013-07-17 |
| CN103205523B true CN103205523B (en) | 2014-12-10 |
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Families Citing this family (1)
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| CN107779539A (en) * | 2016-08-31 | 2018-03-09 | 河南凤宝特钢有限公司 | A kind of method for reducing steel-making slag charge consumption |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000282124A (en) * | 1999-03-29 | 2000-10-10 | Kawasaki Steel Corp | Method for deforming converter slag and method for dephosphorizing molten iron using reformed slag |
| CN101525678A (en) * | 2009-04-21 | 2009-09-09 | 北京科技大学 | Method of replacing lime with limestone for slagging and producing steel in oxygen top blown converter |
| CN102181596A (en) * | 2011-03-31 | 2011-09-14 | 武汉钢铁(集团)公司 | Converter blowing dephosphorization process for cooling converter slag by using limestone |
| CN102864276A (en) * | 2012-10-18 | 2013-01-09 | 吉林建龙钢铁有限责任公司 | Converter inactive lime steelmaking method |
-
2013
- 2013-03-29 CN CN201310108687.6A patent/CN103205523B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000282124A (en) * | 1999-03-29 | 2000-10-10 | Kawasaki Steel Corp | Method for deforming converter slag and method for dephosphorizing molten iron using reformed slag |
| CN101525678A (en) * | 2009-04-21 | 2009-09-09 | 北京科技大学 | Method of replacing lime with limestone for slagging and producing steel in oxygen top blown converter |
| CN102181596A (en) * | 2011-03-31 | 2011-09-14 | 武汉钢铁(集团)公司 | Converter blowing dephosphorization process for cooling converter slag by using limestone |
| CN102864276A (en) * | 2012-10-18 | 2013-01-09 | 吉林建龙钢铁有限责任公司 | Converter inactive lime steelmaking method |
Non-Patent Citations (2)
| Title |
|---|
| 石灰石在转炉炼钢中的应用实践;魏宝森;《冶金能源》;20120831;第31卷(第4期);第11页2.0具体应用实践及表1 * |
| 魏宝森.石灰石在转炉炼钢中的应用实践.《冶金能源》.2012,第31卷(第4期), * |
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| CN103205523A (en) | 2013-07-17 |
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