CN102719595A - Method for handling high slag surface in converter blowing endpoint - Google Patents
Method for handling high slag surface in converter blowing endpoint Download PDFInfo
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- CN102719595A CN102719595A CN2012100874340A CN201210087434A CN102719595A CN 102719595 A CN102719595 A CN 102719595A CN 2012100874340 A CN2012100874340 A CN 2012100874340A CN 201210087434 A CN201210087434 A CN 201210087434A CN 102719595 A CN102719595 A CN 102719595A
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- oxygen
- slag
- converter
- rifle
- slag surface
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Abstract
The invention provides a method for handling high slag surface in a converter blowing endpoint. When slag surface in the converter blowing endpoint is high, an oxygen lance nozzle is kept in an interval between a horizontal position of a converter mouth and a position that is -300mm below the horizontal position of the converter mouth. Oxygen blowing is carried out for 2-3s, after which the oxygen is turned off by hands. The oxygen lance is then lifted to a waiting point position, after which normal tapping can be carried out. Compared with the prior art, oxygen jet in the invention can effectively destroy foaming behaviors of the slag, so that gases in the slag are emitted and the slag surface naturally falls. Thus, the slag surface reaches a stable state rapidly and rapid tapping is guaranteed, thereby decreasing temperature drop of liquid steel, shortening smelting time, reducing erosion of converter furnace lining by high-temperature liquid steel, decreasing production cost, and increasing converter yield.
Description
Technical field
The invention belongs to the process for making technical field, relate in particular to and a kind ofly be used to bessemerize terminal point and effectively handle the high method of the top of the slag.
Background technology
Bessemerize terminal point owing to carbon content in the molten steel reduces, the FeO in the slag sharply raises, and causes the oxidisability of slag to strengthen; And the O in the molten steel can react with ［ C ］, can produce a large amount of CO gas at the molten steel interface, gets in the slag and forms small bubbles; Highly dispersed great amount of bubbles is distributed in the slag liquid; Make slag become a kind of emulsion that is the slag emulsion occurs, thereby the slag volume is expanded rapidly, and cause the high problem of the terminal point top of the slag; Directly do not tap if do not handle, then can cause slag from the fire door accident of gushing out.
At present, handle the high method of the converter smelting endpoint top of the slag both at home and abroad and mainly contain two kinds: a kind of is to add to press residue material to fall slag; Second kind is down that stove carries out manual work and presses slag.But above-mentioned two kinds of methods all exist molten steel temperature drop excessive, and the defective that prolong tap to tap time not only causes quality accidents such as liquid steel temperature is low, and the corresponding smelting cost that increased, and what influence was produced carries out smoothly.
Summary of the invention
The present invention aims to provide and a kind ofly handles the high operation of the converter top of the slag through the oxygen rifle, the Rapid Realization top of the slag steadily, guarantee tapping fast, shorten the heat, what reduce production costs bessemerizes the high treatment process of the terminal point top of the slag.
For this reason, the solution that the present invention taked is:
A kind of high treatment process of the terminal point top of the slag of bessemerizing is characterized in that:
1, through visual fire door flame or from sublance test rear lance dry slag situation, judge that bessemerizing terminal point the high situation of the top of the slag occurs after, the oxygen rifle is selected " manually " operating method;
2, rifle falls by " manually falling the rifle button ", with oxygen lance blow head reduce to and rest on the converter mouth level attitude below the converter mouth level attitude-the 300mm interval in, guarantee that oxygen jet reaches and covers the whole top of the slag;
3, manually open oxygen, oxygen supply intensity 3.0-4.0Nm
3/ mint steel, pressure 1.3-1.4MPa, manual-lock oxygen behind the oxygen blast 2-3s;
4, by " the oxygen rifle is lifted to waiting a button ", the oxygen rifle is lifted to waiting a position, normally carried out tapping steel then.
Compared with present technology, beneficial effect of the present invention is:
Because oxygen jet of the present invention can effectively destroy the foamed phenomenon of slag, make that gas is able to discharge in the slag, the top of the slag descends naturally; Thereby reach top of the slag state stably fast, guarantee tapping fast, and can reduce molten steel temperature drop; Shorten the heat; Alleviate the erosion of high-temperature molten steel, reduce production costs, improve converter output converter lining.
Embodiment
Be example with 260 tons of top and bottom combined blown converters below, the present invention is specified.
Embodiment 1:
1, after converter gets into blow end point, through visual fire door flame situation, promptly and accurately judges top of the slag situation in the stove, in case when finding that the top of the slag is high, should immediately the oxygen rifle be chosen " manually " operating method.
2, by " manually falling the rifle button " rifle falls; Oxygen lance blow head is reduced to and rests on below the converter mouth level attitude-the 200mm interval in; Guarantee that oxygen jet reaches and covers the whole top of the slag, make oxygen jet reach the top of the slag after, can effectively destroy the foamed phenomenon of slag.
3, manual unlocking oxygen carries out oxygen blast, oxygen flow 48000Nm
3/ h, pressure 1.3MPa, strict control oxygen blow duration, manual-lock oxygen behind the lasting 2s of oxygen blast avoids oxygen blow duration long, and the FeO in the slag is assembled once more, increases the emulsion of slag.
4, by " the oxygen rifle is lifted to waiting a button ", the oxygen rifle is lifted to waiting a position, normally carried out tapping steel then.
Embodiment 2:
1, after converter gets into blow end point, through visual fire door flame situation, promptly and accurately judges top of the slag situation in the stove, in case when finding that the top of the slag is high, should immediately the oxygen rifle be chosen " manually " operating method.
2, fall rifle by " manually falling the rifle button ", the converter mouth level attitude is reduced to and rested on to oxygen lance blow head, guarantee that oxygen jet reaches and covers the whole top of the slag, make oxygen jet reach the top of the slag after, can effectively destroy the foamed phenomenon of slag.
3, manual unlocking oxygen carries out oxygen blast, oxygen flow 50000Nm
3/ h, pressure 1.4MPa, strict control oxygen blow duration, manual-lock oxygen behind the lasting 3s of oxygen blast avoids oxygen blow duration long, and the FeO in the slag is assembled once more, increases the emulsion of slag.
4, by " the oxygen rifle is lifted to waiting a button ", the oxygen rifle is lifted to waiting a position, normally carried out tapping steel then.
Claims (1)
1. bessemerize the high treatment process of the terminal point top of the slag for one kind, it is characterized in that:
(1), through visual fire door flame or from sublance test rear lance dry slag situation, judge that bessemerizing terminal point the high situation of the top of the slag occurs after, the oxygen rifle is selected " manually " operating method;
(2), fall rifle by " manually falling the rifle button ", with oxygen lance blow head reduce to and rest on the converter mouth level attitude below the converter mouth level attitude-the 300mm interval in, guarantee that oxygen jet reaches and covers the whole top of the slag;
(3), manually open oxygen, oxygen supply intensity 3.0-4.0Nm
3/ mint steel, pressure 1.3-1.4MPa, manual-lock oxygen behind the oxygen blast 2-3s;
(4), by " the oxygen rifle is lifted to waiting a button ", the oxygen rifle is lifted to waiting a position, normally carry out tapping steel then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100874340A CN102719595A (en) | 2012-03-29 | 2012-03-29 | Method for handling high slag surface in converter blowing endpoint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100874340A CN102719595A (en) | 2012-03-29 | 2012-03-29 | Method for handling high slag surface in converter blowing endpoint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102719595A true CN102719595A (en) | 2012-10-10 |
Family
ID=46945460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100874340A Pending CN102719595A (en) | 2012-03-29 | 2012-03-29 | Method for handling high slag surface in converter blowing endpoint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102719595A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085942A (en) * | 2021-10-27 | 2022-02-25 | 重庆钢铁股份有限公司 | Method for reducing slag surface height in converter tapping process |
-
2012
- 2012-03-29 CN CN2012100874340A patent/CN102719595A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| 卢凯等: "炼钢用氧对转炉喷溅的影响", 《炼钢》 * |
| 卿家胜等: "提高重轨钢终点碳含量的实践", 《炼钢》 * |
| 张坤等: "浅析转炉喷溅的形成原因", 《黑龙江科技信息》 * |
| 胡新海: "表象观察法在转炉操作中的应用", 《有色金属（冶炼部分）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085942A (en) * | 2021-10-27 | 2022-02-25 | 重庆钢铁股份有限公司 | Method for reducing slag surface height in converter tapping process |
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Application publication date: 20121010 |