CN113278760A - Method for defoaming converter double-slag smelting steel slag - Google Patents
Method for defoaming converter double-slag smelting steel slag Download PDFInfo
- Publication number
- CN113278760A CN113278760A CN202110390440.2A CN202110390440A CN113278760A CN 113278760 A CN113278760 A CN 113278760A CN 202110390440 A CN202110390440 A CN 202110390440A CN 113278760 A CN113278760 A CN 113278760A
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- CN
- China
- Prior art keywords
- slag
- converter
- double
- balls
- smelting
- 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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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
- C21C2005/366—Foam slags
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for defoaming converter double-slag smelting steel slag, which comprises the following steps: before the first time of the double-slag smelting, a proper amount of iron oxide leather balls or dust removal cement balls are added into the converter through a converter high-level bin, the foamed slag is opened to form a gas discharge channel, the gas in the foamed slag is released, and the foaming is removed. The invention aims to provide a method for removing foam of converter double-slag smelting steel slag, which obviously reduces the foaming condition of the first deslagging slag in the converter double-slag process smelting; the deslagging operation time is reduced; the amount of metal in slag is reduced, the metal loss is reduced, and the consumption of steel materials is reduced.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for removing foam of converter double-slag smelting steel slag.
Background
Because the iron content in the slag is basically between 15 and 20 percent, in order to reduce the iron oxide formed by the molten iron oxide and the scrap steel from entering the slag, 20 to 30 percent of iron-containing raw materials of the total slag charge are added when the converter starts to smelt so as to make up the consumption of the iron and steel charge (the cost and the price are low), and meanwhile, under the condition of certain alkalinity, temperature and slag amount, the oxidability of the converter is improved, and the dephosphorization efficiency of the converter can also be improved. As a large amount of iron-containing oxide and high-speed jet oxygen streams are added in advance, and part of C is oxidized, the ratio of carbon oxide is about 0.5% basically from experimental results, the gas conditions for foaming the foamed slag are provided, the formed foamed slag can increase the reaction area and improve the dephosphorization efficiency, and the slag is likely to form foam when the dephosphorization ratio is high in actual production by controlling the conditions such as the gun position.
The slag is thickened by the foamed slag, the lance is lifted for deslagging within 5 minutes during blowing, the retention time of the foamed slag is prolonged as far as possible due to short smelting time, the furnace level is higher during deslagging possibly caused in the deslagging process of the converter, and even a large amount of iron beads are mixed in the slag, so that the deslagging time is influenced, and the consumption of steel materials is increased.
Disclosure of Invention
The invention aims to provide a method for removing foam of converter double-slag smelting steel slag, which solves the problem of iron loss caused by serious slag foam in a double-slag smelting process in the background technology.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for removing foam of dual-slag smelting steel slag of a converter is characterized in that a proper amount of iron oxide skin balls or dust removal cement balls are added into the converter through a converter overhead bin before the dual-slag smelting is poured for the first time, foam slag is opened to form a gas discharge channel, gas in the foam slag is released, and the foam is removed.
Furthermore, the adding amount is 4kg/t-5kg/t per ton steel.
Further, after adding the iron oxide leather balls or the fly ash mud balls, the converter is kept still for 30 seconds to ensure that the added slag materials fully open the foamed slag.
Further, after removing the foaming, the mixture is kept stand for 30 seconds, and then normal converter deslagging operation is started.
Compared with the prior art, the invention has the beneficial technical effects that:
after the method is adopted, the bubble bath condition of the first deslagging slag in the converter double-slag process smelting is obviously reduced; the deslagging operation time is reduced; the amount of metal in slag is reduced, the metal loss is reduced, and the consumption of steel materials is reduced.
Detailed Description
So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
A method for defoaming converter double-slag smelting steel slag comprises the following steps:
before the first time of the double-slag smelting, adding a proper amount of iron oxide skin balls or dust removal ash mud balls into the converter through a converter high-level bin, accounting for 4-5 kg/t of steel per ton by weight, standing the converter for about 30 seconds after adding the iron oxide skin balls or dust removal ash mud balls to ensure that the added slag fully opens the foamed slag to form a gas discharge channel, releasing gas in the foamed slag and removing foaming. And standing for 30 seconds, and then starting normal operation of turning down the furnace and deslagging.
By adopting the method, through practical operation, the foam of the smelting steel slag is effectively removed in the double-slag smelting process, thereby achieving the purposes of reducing the deslagging operation time, reducing the metal content of the slag, reducing the metal loss and reducing the consumption of the iron and steel materials.
The invention can quickly remove the foaming of the slag by adding a small amount of slagging material before the furnace is turned over. The method is mainly characterized in that a proper amount of ferric oxide leather balls or dust removal cement balls are added to quickly open the foam slag to form a channel, gas in the foam slag is released, foaming is removed, and iron beads in the slag are returned to molten steel.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. A method for removing foam of converter double-slag smelting steel slag is characterized in that a proper amount of iron oxide leather balls or dust removal cement balls are added into a converter through a converter overhead bin before the first converter pouring of double-slag smelting, foam slag is opened to form a gas discharge channel, gas in the foam slag is released, and the foam is removed.
2. The method of claim 1, wherein the amount added is 4kg/t to 5kg/t per ton of steel.
3. The method of claim 1, wherein the added slag is left for 30 seconds after the addition of the iron oxide skin balls or the fly ash mud balls, so that the added slag is sufficiently foamed.
4. The method of claim 1, wherein normal deslagging is performed after 30 seconds of standing after defoaming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110390440.2A CN113278760A (en) | 2021-04-12 | 2021-04-12 | Method for defoaming converter double-slag smelting steel slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110390440.2A CN113278760A (en) | 2021-04-12 | 2021-04-12 | Method for defoaming converter double-slag smelting steel slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113278760A true CN113278760A (en) | 2021-08-20 |
Family
ID=77276578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110390440.2A Pending CN113278760A (en) | 2021-04-12 | 2021-04-12 | Method for defoaming converter double-slag smelting steel slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113278760A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114058771A (en) * | 2021-11-05 | 2022-02-18 | 阳春新钢铁有限责任公司 | Slag charging converter steelmaking method capable of reducing early-stage slag overflow |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480246A (en) * | 2014-12-02 | 2015-04-01 | 天津钢铁集团有限公司 | Slag control method of dephosphorization foaming slag in converter double-slag-process steel making |
| CN111440918A (en) * | 2020-04-07 | 2020-07-24 | 包头钢铁（集团）有限责任公司 | Method for defoaming dephosphorization residues by utilizing recycled resources |
-
2021
- 2021-04-12 CN CN202110390440.2A patent/CN113278760A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480246A (en) * | 2014-12-02 | 2015-04-01 | 天津钢铁集团有限公司 | Slag control method of dephosphorization foaming slag in converter double-slag-process steel making |
| CN111440918A (en) * | 2020-04-07 | 2020-07-24 | 包头钢铁（集团）有限责任公司 | Method for defoaming dephosphorization residues by utilizing recycled resources |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114058771A (en) * | 2021-11-05 | 2022-02-18 | 阳春新钢铁有限责任公司 | Slag charging converter steelmaking method capable of reducing early-stage slag overflow |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210820 |