CN105219913A - A kind of method optimizing converter slag-making - Google Patents
A kind of method optimizing converter slag-making Download PDFInfo
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- CN105219913A CN105219913A CN201510761210.7A CN201510761210A CN105219913A CN 105219913 A CN105219913 A CN 105219913A CN 201510761210 A CN201510761210 A CN 201510761210A CN 105219913 A CN105219913 A CN 105219913A
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- 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
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Abstract
Optimize a method for converter slag-making, refining slag weight percent consists of CaO=40% ~ 60%, Al
2o
3=15% ~ 35%, Si≤10%, TFe≤5%, Mg=5% ~ 15%, all the other impurity brought for slag making raw material; Its processing step comprises: (1) material recycle; (2) slag charge adds; (3) oxygen blast system; (4) slagging regime.For the production line of revolving furnace continuous casting short route, by reclaiming residual casting slag, the efficient oxidation calcium in residual casting slag is utilized to provide basicity in smelting process, and utilize the Al2O3 in residual casting slag to carry out modification to converter slag, reduce converter slag fusing point, ensure smelting process slag effect, ensure whole process slag, reduce splash, thus stablize dephosphorization rate and steel technology.The present invention is applicable to the converter smelting of soft steel, medium carbon steel and high carbon steel, without the need to transforming existing installation, on the basis not increasing investment and production cost, improving converter dephosphorization rate and reduce iron and steel stock desired value by process optimization.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of method optimizing converter slag-making.
Technical background
Iron and steel enterprise, for reducing the needs of production cost or running into raw material supply at need, has to adopt low-quality ore.Low-quality ore means the increase of P and Si content in molten iron, and in molten iron, the molten steel that increases to of P and Si adds great difficulty in the smelting of converter.Stablizing of converter P removal rate is extremely important, and the increase of P causes larger obstacle for the smelting of converter variety steel, and number of times of re-blowing can be caused to increase, and recovery rate of iron is low, smelts rhythm and is affected.Si content increase in addition in molten iron causes the quantity of slag to increase, and easily the situation such as slag, splash of overflowing occurs, not only affect converter consumption indicators in smelting process, and also have impact on the suitable of production must carry out, and causes the damage of equipment.Therefore, use low-quality ore to need to improve the slag system of converter, to reduce splash rate, improve and stablize P removal rate.
Traditional converter slag system improvement opportunity all realizes by adding a certain amount of compound slagging agent.Add dissolving agent except needs and improve Financial cost, the problem of also for some time slagging scorification again after also existing slag.As China Patent No. CN200910308932.1 describes " composite fluxing medium for revolving furnace ", proposition use converter OG sludge etc. are as raw material production converter dissolving agent.Need of production Special Equipment, and activeconstituents is mainly Fe
2o
3, be only applicable to initial stage slag, steel mill utilizes rapidly and still has some limitations.As China Patent No. CN200910152586.2 describes " compound slagging agent of converter and its preparation method and application ", propose to need to utilize broken to sinter etc. of manganese ore and other oxide compound auxiliary materials to make compound slagging agent of converter.But add owing to relating to the raw materials such as ore, secondary pollution can be caused to converter molten steel, increase all kinds of residual element ratio.
Summary of the invention
The object of this invention is to provide a kind of method optimizing converter slag-making, under existing installation condition, adjusted by production technique, the slag steel classification processing capacity utilizing steel mill usually to possess, the residual casting slag taken out after ferrous material is carried out fragmentation recycling, join in converter, modification is carried out to converter slag.
The present invention is achieved through the following technical solutions:
, refining slag Composition Control weight percent consists of CaO=40% ~ 60%, Al
2o
3=15% ~ 35%, Si≤10%, TFe≤5%, Mg=5% ~ 15%, all the other impurity brought for slag making raw material.Its processing step comprises:
(1) material recycle: continuous-casting steel pouring terminates to reclaim refining slag afterwards, takes naturally cooling in removal process; Carry out fragmentation routinely after cooling, be separated ferrous material, non-ferrous material pack is reclaimed, delivers to converter feed bin.
(2) material adds: material adds in two batches, open blow 1.5min after add the first batch of material, add the 2nd batch of material opening to blow in 8 ~ 10min, two batches of total add-ons are 1 ~ 5kg/ ton steel.
(3) oxygen blast system: early stage utilizes peak pressure peak flow to light a fire, burning torch position 1.8m ~ 2.5m, front 5min, for controlling silicomanganese oxidizing intensity, are reduced to the flow of peak value 80%, and rifle position controls 1.3 ~ 1.6m.After treating that slagformation period terminates, be increased to oxygen flowing pressure peak pressure and peak flow.7 ~ 10min promotes rifle position to 1.6m ~ 2m, and adds fluxing slag, accelerationization slag; Pressure rifle at least 1min, rifle position 1.3 ~ 1.5m before terminal.
(4) slagging regime: Intake Quantity 155 ± 3t.Open after blowing 1.5min and add lime 2 ~ 2.5t, 8 ~ 10min adds lime 1 ~ 2t, and the final basicity of converter controls between 2.0 ~ 3.5.
Adopt the inventive method to smelt low P steel, dephosphorization rate, more than 90%, greatly reduces the splash in smelting process, excessive slag phenomenon.The present invention is applicable to all kinds of soft steel, medium carbon steel and the high carbon steel converter smelting higher to P requirement.
Beneficial effect of the present invention: utilize steel mill's existing installation and technique, non-ferrous material in residual casting slag is reclaimed, as the raw material of converter slag modification, do not increase extra investment, converter smelting process does not need too much adjustment yet, converter P removal rate be can significantly promote, the splash of converter, excessive slag effect reduced.
Embodiment
Below in conjunction with embodiment, content of the present invention is described further:
Example 1: a kind of method optimizing converter slag-making
Refining slag Composition Control weight percent consists of CaO=40% ~ 60%, Al
2o
3=15% ~ 35%, Si≤10%, TFe≤5%, Mg=5% ~ 15%, all the other impurity brought for slag making raw material, its processing step comprises:
(1) material recycle: continuous-casting steel pouring terminates to reclaim refining slag afterwards, takes naturally cooling, carry out physics fragmentation routinely, be separated ferrous material by electro-magnet after cooling in removal process, reclaims non-ferrous material pack, delivers to converter feed bin.
(2) material adds: properties-correcting agent adds in two batches, blows 1 point after 32 seconds and adds the first batch of material opening, add 100kg, and blow 8min and occur slightly returning dry opening, add 100kg, two batches of total add-ons are 200kg, are about 1.4kg/ ton steel.
(3) oxygen blast system: early stage utilizes peak pressure, 30000m
3the flow igniting of/h, before after igniting, 5min is by flow modulation 28000m
3/ h, smelting process to be overflow slag without splash.After treating that slagformation period terminates, improve oxygen flow to 30000m
3/ h.Return dry phenomenon after 8min to occur, promote rifle position and add properties-correcting agent, return dry phenomenon and disappear, until 1.5min presses rifle catch carbon before carrying rifle.Whole process is steadily without returning dry dreg overflowless.
(4) slagging regime: molten iron steel scrap Intake Quantity 156.15t, whole process adds lime in two batches and amounts to 3.2t.Wherein open to blow and add lime 2t, 5 ~ 6min adds lime 1.2t in two batches.Basicity is about 3.2.
Manufacturing parameter and supplies consumption situation are in table 1, table 2.Smelting process is steady, dry without seriously returning, dreg overflowless.Molten iron P=136 × 10
-5, finished product P=10 × 10
-5t%, P removal rate is about 92%.
Example 2: a kind of method optimizing converter slag-making
Refining slag Composition Control weight percent consists of CaO=40% ~ 60%, Al
2o
3=15% ~ 35%, Si≤10%, TFe≤5%, Mg=5% ~ 15%, all the other impurity brought for slag making raw material, its processing step comprises:
(1) material recycle: continuous-casting steel pouring terminates to reclaim refining slag afterwards, takes naturally cooling, carry out physics fragmentation routinely, be separated ferrous material by electro-magnet after cooling in removal process, reclaims non-ferrous material pack, delivers to converter feed bin.
(2) material adds: properties-correcting agent adds in two batches, blows 1 point after 28 seconds and adds the first batch of material opening, add 100kg, and blow about 10min and add 50kg opening, two batches of total add-ons are 150kg, are about 1.1kg/ ton steel.
(3) oxygen blast system: early stage utilizes peak pressure, 30000m
3the flow igniting of/h, before after igniting, 5min is by flow modulation 28000m
3/ h, smelting process to be overflow slag without splash.After treating that slagformation period terminates, improve oxygen flow to 30000m
3/ h.Slightly promote rifle position after 7min, 10min adds properties-correcting agent, until 1.5min presses rifle catch carbon before carrying rifle.Whole process is steadily without returning dry dreg overflowless.
(4) slagging regime: molten iron steel scrap Intake Quantity 157.85t, whole process adds lime in two batches and amounts to 3.4t.Wherein open to blow and add lime 2t, 5 ~ 6min adds lime 1.4t in two batches.Basicity is about 3.1.
Manufacturing parameter and supplies consumption situation are in table 1, table 2.Smelting process is steady, dry without seriously returning, dreg overflowless.Molten iron P=134 × 10
-5, finished product P=14 × 10
-5, P removal rate is 90%.
Table 1 manufacturing parameter table
Table 2 supplies consumption table
As shown in table 1, individual table 2, after properties-correcting agent adds, lime consumption remains unchanged, and steel technology average 1056, reaches good level.The steady dreg overflowless of smelting process is without splash.One to fall P removal rate be 85%, terminal P removal rate 91%.
Claims (1)
1. optimize a method for converter slag-making, it is characterized in that: refining slag weight percent consists of CaO=40% ~ 60%, Al
2o
3=15% ~ 35%, Si≤10%, TFe≤5%, Mg=5% ~ 15%, all the other impurity brought for slag making raw material; Processing step comprises:
(1) material recycle: continuous-casting steel pouring terminates to reclaim refining slag afterwards, takes naturally cooling in removal process; Carry out fragmentation routinely after cooling, be separated ferrous material, non-ferrous material pack is reclaimed, delivers to converter feed bin;
(2) material adds: properties-correcting agent adds in two batches, open blow 1.5min after add the first batch of material, add the 2nd batch of material opening to blow in 8 ~ 10min, two batches of total add-ons are 1 ~ 5kg/ ton steel;
(3) oxygen blast system: early stage utilizes peak pressure peak flow to light a fire, burning torch position 1.8m ~ 2.5m, front 5min is for controlling silicomanganese oxidizing intensity, be reduced to the flow of peak value 80%, rifle position controls 1.3 ~ 1.6m, after treating that slagformation period terminates, be increased to oxygen flowing pressure peak pressure and peak flow; 7 ~ 10min promotes rifle position to 1.6m ~ 2m, and adds fluxing slag accelerationization slag; Pressure rifle at least 1min, rifle position 1.3 ~ 1.5m before terminal;
(4) slagging regime: molten iron steel scrap Intake Quantity 155 ± 3t, open after blowing 1.5min and add lime 2 ~ 2.5t, 8 ~ 10min adds lime 1 ~ 2t, and the final basicity of converter controls between 2.0 ~ 3.5.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755711A (en) * | 2017-03-23 | 2017-05-31 | 张炳元 | One-touch intelligent method for making steel |
| CN107385141A (en) * | 2017-07-31 | 2017-11-24 | 唐山钢铁集团有限责任公司 | A kind of method for reducing iron shot content in high-carbon steel converter terminal slag |
| CN108977611A (en) * | 2018-08-31 | 2018-12-11 | 武钢集团昆明钢铁股份有限公司 | A kind of converter hot metal containing low silicon converting method using cast steel recrement |
| CN109338028A (en) * | 2018-11-02 | 2019-02-15 | 武汉钢铁有限公司 | A kind of efficient slagging process of converter stable state |
| CN109897935A (en) * | 2019-03-19 | 2019-06-18 | 首钢集团有限公司 | A kind of cold method abandoned tundish covering flux and be used as converter slagging agent |
| CN112899430A (en) * | 2021-01-14 | 2021-06-04 | 安徽工业大学 | Method for improving energy utilization efficiency in converter |
-
2015
- 2015-11-10 CN CN201510761210.7A patent/CN105219913A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 苏兴文等: "冶金渣的循环利用-LF炉精炼炉渣用作转炉助熔剂", 《第七届（2009）中国钢铁年会论文集》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755711A (en) * | 2017-03-23 | 2017-05-31 | 张炳元 | One-touch intelligent method for making steel |
| CN107385141A (en) * | 2017-07-31 | 2017-11-24 | 唐山钢铁集团有限责任公司 | A kind of method for reducing iron shot content in high-carbon steel converter terminal slag |
| CN108977611A (en) * | 2018-08-31 | 2018-12-11 | 武钢集团昆明钢铁股份有限公司 | A kind of converter hot metal containing low silicon converting method using cast steel recrement |
| CN109338028A (en) * | 2018-11-02 | 2019-02-15 | 武汉钢铁有限公司 | A kind of efficient slagging process of converter stable state |
| CN109897935A (en) * | 2019-03-19 | 2019-06-18 | 首钢集团有限公司 | A kind of cold method abandoned tundish covering flux and be used as converter slagging agent |
| CN112899430A (en) * | 2021-01-14 | 2021-06-04 | 安徽工业大学 | Method for improving energy utilization efficiency in converter |
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Application publication date: 20160106 |