CN1336442A - Hot loading process of molten iron in electric furnace and conveying vehicle for blast furnace molten iron - Google Patents
Hot loading process of molten iron in electric furnace and conveying vehicle for blast furnace molten iron Download PDFInfo
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- CN1336442A CN1336442A CN00112434A CN00112434A CN1336442A CN 1336442 A CN1336442 A CN 1336442A CN 00112434 A CN00112434 A CN 00112434A CN 00112434 A CN00112434 A CN 00112434A CN 1336442 A CN1336442 A CN 1336442A
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Abstract
The present invention relates to electric furnace molten iron hot pack new technology and its blast furnace molten iron conveying car, the blast furnace molten iron is directly added into electric furnace to instead part of the waste steel for smelting, it is characterized in that the molten iron at hot state produced from blast furnace is conveyed to super high power electric furnace workshop using blast furnace molten iron conveying car, and determine the ratio, site, time, oxygen use level of molten iron added to electric furnace. Advantages: expand the use of pig iron, solving the purity problem of molten steel, saving energy consumption etc.
Description
The present invention relates to a kind of blast-melted direct adding electric furnace be carried out steel-making technology and blast-melted transport trolley thereof to substitute the part steel scrap, belong to metallurgical technology field.
The used starting material steel scrap of electric furnace, complicated, of a great variety because of its source, can't differentiate, easily cause impurity elements such as nickel in the steel, chromium, copper to rise, the kind of steel, quality are restricted.In addition, Electric furnace steel making belongs to the process for making of high energy consumption.Electric furnace hot metal charge steel-making is to add that with steel scrap heating molten steel makes raw material, is about to blast-melted direct adding electric furnace, smelts to substitute the part steel scrap.This hot metal charge steel-making technology can obviously reduce energy consumption of electric furnace, increases output, improve molten steel purity, but electric furnace adds amount, the joining day of molten iron, and various economic targets are had tangible influence, can the especially release of the chemical energy in the molten iron be carried out smoothly to operation, influences bigger.At present, the steel-making of electric furnace hot metal charge is still in exploitation is groped.
The objective of the invention is to disclose a kind of electric furnace liquid iron charging novel process, mainly be open the best the molten iron add-on, add implantation site, joining day and flow of oxygen.
Technical process of the present invention is, and is blast-melted through production line or vehicle transport, adds electric furnace with the instead of part steel scrap, after melting to ladle refining furnace again to continuous casting line.Implementing technical essential of the present invention is:
1, the molten iron joining day
Electric furnace adds molten iron, carries out not changing under the electric cooker structure situation, and in smelting process, the suitable time that can hot metal charging is:
(1) add first the bag steel scrap after
Add the first bag steel scrap in electric furnace after, decontrol bell after smelting for some time and add molten iron, because molten iron adds morning, the C-O reaction times is abundant, does not generally produce added burden to smelting.Big or add the implantation site when improper as the molten iron add-on, easily cause furnace charge to put up a bridge, not only be difficult to handle in case form to put up a bridge, and influence the adding of next bag steel scrap, increase the number of times that once revolves bell, increased calorific loss.For preventing this phenomenon, the position that adds molten iron should be to add in the middle of the burner hearth.
(2) add second the bag steel scrap after
When molten iron adds fashionablely during the second bag steel scrap is smelted,, often cause molten clear C too high because the time of C-O reaction is shorter, make smelting produce the extra C that takes off and bear, prolonged tap to tap time, same, more and adding mode very easily forms the bridging of furnace charge not at that time when add-on.When all fusings of lower furnace portion steel scrap, form the molten bath, and the top steel scrap that has been covered with, molten iron is stained with steel scrap as thick knot agent after meeting the steel scrap cooling.In case temperature is raised to when enough, steel scrap collapses in the pyritous molten bath with a loud crash, and fierce C-O reaction forms big boiling and splash, very easily causes serious equipment and fatal accident, therefore, add the second bag steel scrap after, add-on that must the control molten iron.
(3) the tapping back adds
Because molten iron is added in furnace charge below, can not influence operation, the C-O reaction times is longer, and the thermo-efficiency height is an ideal hot metal charging mode comparatively, outwards winding because of having reduced by a bell simultaneously, has both shortened the reinforced time, has reduced thermosteresis again.
2, molten iron add-on
When molten iron ratio during at 15%-20%, furnace operation is constant substantially, and power consumption reduces, and slightly shorten tap to tap time, and the molten clear carbon back of electric furnace originally remains unchanged.When molten iron ratio during at 20%-40%, electric furnace reaction between carbon and oxygen fierceness easily forms splash, and slag sprays from fire door, very easily causes the personnel safety accident.For avoiding this phenomenon, should increase oxygen flow, improve the oxygen blast condition, the progress and the degree of control C-O reaction.When smelting silicon steel, the maximum ratio of molten iron add-on is 50%-60%, for preventing to cause violent agitation, needs control to take off C speed.In whole smelting process, oxygen blast operation basically, the electricity of not bothering to see me out, all smelting process is by the chemical energy heat supply.
3, flow of oxygen
After electric furnace uses liquid iron charging, as the oxygen delivery capacity deficiency, easily cause C content height in the molten clear steel, it is long to take off the C time, and unfavorable steel-making is operated and carried out smoothly.Therefore, must guarantee enough oxygen-supplying amounts.Can select purity for use for reducing cost be the low purity oxygen of 90%-94%.Low purity oxygen can adopt vacuum pressure varying adsorption technology to make, it mainly is to utilize in two artistic beds to be used alternatingly adsorbent of molecular sieve, be used for from the air oxygen separation, the molecular sieve property selected absorption nitrogen, water, titanium dioxide hydrocarbon molecules, and allow oxygen pass through, obtain purity 90%-94% product oxygen.
Below in conjunction with drawings and Examples the present invention is described in further detail.Accompanying drawing 1 is a process flow sheet of the present invention, and accompanying drawing 2 is an instantaneous Oxygen Flow spirogram of the present invention, and accompanying drawing 3 is blast-melted transport trolley synoptic diagram.Embodiment 1: with blast-melted injection hot metal ladle 2, hot metal ladle 2 is used high temperature resistant steel plate, makes drum shape, bag wall liner refractory materials 3, and there is gudgeon 4 hot metal ladle 2 both sides.Molten iron is packed into after the hot metal ladle, at molten iron surface coverage one deck heat preserving agent, builds 1 insulation of molten iron clad again.The blast-melted transport trolley 9 of foundry ladle transports, and there are hot metal ladle fixed support 6 and mounting flange 5 in blast-melted transport trolley 9 middle parts, by the support guide plate hot metal ladle are positioned in the mounting flange 5.Just in case wear bag, molten iron damages vehicle frame or flows on the ground, causes accident in order to prevent hot metal ladle, and producing the Baltimore groove 8 inwalls block of putting hot metal ladle at bottom of frame has refractory materials 7.With the first steel scrap construction materials contract electric furnace of packing into, molten after 4-5 minute, electrode is worn well and is added molten iron on earth the time, and additional proportion is 15%-20%.After blast-melted transport trolley enters main span, with driving the molten iron clad is hung away, again hot metal ladle is sling, be put on the electronic scales steadyly, again hot metal ladle winched to electric furnace top, stop to power to electric furnace, the bell of outwarding winding, wear well location along electric furnace centre electrode and put and blow slowly, guaranteeing that molten iron does not stick on the steel scrap, and flow into the bottom, molten bath.After molten iron adds electric furnace, carry out the oxygen blast operation immediately, adopt purity 90%-94% oxygen, oxygen flow 4000Nm
3/ h oxygen blast 13 minutes adds steel scrap for the second time, 16 minutes oxygen flow 4000Nm of oxygen blast
3/ h, melting batch, molten steel be to refining furnace, oxygen blast 10 minutes, oxygen flow 2500Nm
3/ h, blowing argon gas simultaneously stirs molten steel and strengthens the rate of air sucked in required of dust-removal system and bleed the time, makes that nitrogen is most of overflows tapping.
Embodiment 2: reach 40% as the molten iron add-on, and uhp electric arc furnace, oxygen flow can reach 2500Nm
3/ h, decarbonization rate are 0.03-0.08%/min, and other processing parameter and operating process are with embodiment 1.
Embodiment 3: as what smelt is medium and high carbon steel, is smelting the later stage, when temperature＞1580 ℃, stops power supply, by the chemical energy heat supply.Other process is with embodiment 1.
By above-mentioned technology, each embodiment chooses 100 stoves respectively, and the average content of the molten clear C of electric furnace is 0.29% after testing, satisfies the steel grade requirement.A nitrogen content of Finished Steel is all in normal range.
After adopting the liquid iron charging steel-making technology, between 20%-30%, ton steel average current drain can reduce 50KWh as the molten iron add-on.Impurity contents such as nickel, chromium, copper obviously reduce with the increase of molten iron add-on in the steel, are beneficial to produce various high-quality steel.。
Claims (2)
1, electric furnace liquid iron charging novel process and blast-melted transport trolley thereof is characterized in that:
(1) the molten iron joining day is to add with the tapping back after the first bag steel scrap was packed into electrosmelting 4-5 minute or during adding the second bag steel scrap smelting.
(2) additional proportion of molten iron is 15%-40%, smelting silicon steel, and the maximum ratio that molten iron adds is 50%-60%.
(3) during hot metal charging, stop to the electric furnace power supply, the bell of outwarding winding is worn well location along electric furnace centre electrode and is put, and blows slowly.
(4) add molten iron, cover bell, carry out the oxygen blast operation immediately, uhp electric arc furnace, the molten iron add-on is 40% o'clock, oxygen flow can reach 2500Nm
3/ h, decarbonization rate are 0.03-0.08%/min.
(5) oxygen of using to oxygen blast of electric furnace, the low purity oxygen of available 90%-94%.
2, by claim 1 described electric furnace liquid iron charging novel process and blast-melted transport trolley thereof, it is characterized in that: blast-melted injection hot metal ladle (2), transport with blast-melted transport trolley (9); Hot metal ladle (2) is made drum shape with high temperature resistant steel plate, the bag wall liner refractory materials (3), there is gudgeon (4) both sides, on molten iron clad (1) is arranged; There are hot metal ladle fixed support (6) and mounting flange (5) in blast-melted transport trolley (9) middle part, and bottom of frame Baltimore groove (8) inwall is built refractory materials (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00112434A CN1120243C (en) | 2000-07-29 | 2000-07-29 | Hot loading process of molten iron in electric furnace and conveying vehicle for blast furnace molten iron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00112434A CN1120243C (en) | 2000-07-29 | 2000-07-29 | Hot loading process of molten iron in electric furnace and conveying vehicle for blast furnace molten iron |
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| Publication Number | Publication Date |
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| CN1336442A true CN1336442A (en) | 2002-02-20 |
| CN1120243C CN1120243C (en) | 2003-09-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102559994A (en) * | 2012-03-20 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | Method for drying electric furnace by using molten iron |
| CN103667588A (en) * | 2013-09-05 | 2014-03-26 | 通裕重工股份有限公司 | Electric converter steelmaking process |
| CN107164604A (en) * | 2017-04-26 | 2017-09-15 | 河钢股份有限公司承德分公司 | A kind of method that molten iron is incubated in ladle refining furnace |
-
2000
- 2000-07-29 CN CN00112434A patent/CN1120243C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102559994A (en) * | 2012-03-20 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | Method for drying electric furnace by using molten iron |
| CN102559994B (en) * | 2012-03-20 | 2013-11-27 | 江苏省沙钢钢铁研究院有限公司 | Method for drying electric furnace by using molten iron |
| CN103667588A (en) * | 2013-09-05 | 2014-03-26 | 通裕重工股份有限公司 | Electric converter steelmaking process |
| CN107164604A (en) * | 2017-04-26 | 2017-09-15 | 河钢股份有限公司承德分公司 | A kind of method that molten iron is incubated in ladle refining furnace |
| CN107164604B (en) * | 2017-04-26 | 2018-10-16 | 河钢股份有限公司承德分公司 | A kind of method that molten iron is kept the temperature in ladle refining furnace |
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| Publication number | Publication date |
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| CN1120243C (en) | 2003-09-03 |
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