CN104694690A - Revolving furnace efficient slag pressing agent - Google Patents
Revolving furnace efficient slag pressing agent Download PDFInfo
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- CN104694690A CN104694690A CN201510137769.2A CN201510137769A CN104694690A CN 104694690 A CN104694690 A CN 104694690A CN 201510137769 A CN201510137769 A CN 201510137769A CN 104694690 A CN104694690 A CN 104694690A
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- slag
- converter
- carbon refractory
- magnesium carbon
- lime stone
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a revolving furnace efficient slag pressing agent. The agent comprises components of, by weight, 60% to 68% of limestone powder, 10% to 18% of steel scraps, 20% to 25% of waste magnesia-carbon refractory materials and 2% to 5% of soil. Part of oxygen in steel slag can be removed through the slag pressing agent, the slag can be cooled and thickened, slag splashing time is shortened, and the slag splashing and furnace protection effects are improved.
Description
Technical field
The present invention relates to the efficient pressure agent of a kind of converter, belong to metallurgical technology field.
Background technology
In converter steelmaking process, midway needs deslagging, but sometimes liquid steel slag foamed is serious, can not pour out slag smoothly, need in stove, drop into pressure agent and carry out pressure slag.At present, the pressure agent of coverter pig generally adopts the composition binding agent compactings such as earth, wood chip, lime to form.Because converter terminal slag and molten steel oxidation are strong under present process for making condition, during tapping, slag foaming is serious, and the needs of sub-lance technique application in addition, converter need keep larger furnace port diameter, and the large fire door of tapping process gushes slag outstanding problem.Current pressure agent pressure slag is not owing to fundamentally reducing the oxygen in slag, and after slag is subdued, carbon oxygen continues reaction, and the CO bubble of generation makes again slag foam, and pressure slag effect is undesirable.Simultaneously for iron and steel enterprise, introduce the cost that pressure agent can increase iron and steel enterprise in addition; Even if some pressure agent uses waste material, but also need to introduce from external source, certain transport and raw materials cost can be paid.
For the problems referred to above, after the present invention directly uses the waste material stirring and evenly mixing in steelwork converter production process, use as pressure agent, not only there is no raw material and transportation cost, also serve the effect of utilization of waste material, purified environment.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides the efficient pressure agent of a kind of converter, this pressure agent can not only remove the part oxygen in slag, and can play the effect of cooling and multiviscosisty to slag, shortens and spatters the slag time, improve the effect of slag splashing.
Technical scheme of the present invention is: the efficient pressure agent of a kind of converter, and its component and weight ratio are: used lime stone flour 60 ~ 68%, waste steel slag 10 ~ 18%, useless magnesium carbon refractory 20 ~ 25%, earth 2 ~ 5%.
Optimum ratio (weight ratio): used lime stone flour 65%, waste steel slag 12%, useless magnesium carbon refractory 20%, earth 3%.
Preparation method:
1) waste steel slag steelworks produced and useless magnesium carbon refractory, the particle becoming below 30mm with jaw crusher fragmentation is for subsequent use;
2) used lime stone flour is sieved, obtain the used lime stone flour of 2 ~ 5mm;
3) by after used lime stone flour, waste steel slag, useless magnesium carbon refractory and earth mixing, pack for subsequent use.
Each raw material and effect
Used lime stone flour: granularity requirements is 2 ~ 5mm.Wingdale is slag former conventional in convertor steelmaking process, and granularity requirements when converter uses is 5 ~ 40mm, and lumpiness is too small, is easily taken away by furnace gas.Granularity is less than the Wingdale of 5mm as waste, may be used for pressure agent of the present invention.The present invention adds the less limestone powder of granularity and is used for improving cinder viscosity and reducing slag temperature, to reach the object of pressure slag dry slag.In the present invention, the granularity of Wingdale is very crucial, and limestone granularity is excessive, and burn-off rate is slow, and can not play the antispray object of instantaneous raising cinder viscosity, undersized is easily taken away by air-flow.The size of this granularity is through the result of applicant's repetition test, both ensure that transient melting, is not easy again to be taken away (certain booster action is played in the use of other raw materials such as earth) by air-flow.
Waste steel slag: steel-making converter slag is through broken, magnetic separation (choosing useful element reuse), then after screening by 5 ~ 30mm granularity requirements, just obtain the waste steel slag used, its main component is suitable with steel-making converter slag composition under existing processing condition.The present invention smashes slag foam by adding waste steel slag in stove.
Useless magnesium carbon refractory: the furnace lining of the converter of steel-making common equipment, electric arc furnace and induction furnace converter all uses magnesia carbon brick to build by laying bricks or stones, therefore can produce a large amount of useless magnesium carbon refractories at steelworks.Magnesium oxide in useless magnesium carbon refractory can improve slag melting; A small amount of carbonaceous material in useless magnesium carbon refractory, carries out deoxidation to reduce the FeO in slag to slag, improves cinder viscosity, can obtain pressure slag dry slag effect preferably.
Mechanism of the present invention is: fire door gushes slag and is slag foamed, and slag foamed is that again in stove, in molten steel, CO and molten steel carbon oxygen imbalance oxygen more than needed diffuse into slag from molten steel.Smashing slag foam by adding waste steel slag in stove, adding limestone powder and being used for improving cinder viscosity and reducing slag temperature, to reach the object of pressure slag dry slag.In addition, add useless magnesium carbon refractory in pressure agent, the magnesium oxide in useless magnesium carbon refractory can improve slag melting; A small amount of carbonaceous material in useless magnesium carbon refractory, carries out deoxidation to reduce the FeO in slag to slag, improves cinder viscosity, can obtain pressure slag dry slag effect preferably.Earth mainly plays the effect of compacting splash; Press for slag residue adjustment effect for limestone powder, waste steel slag and useless magnesium carbon refractory, limestone powder and waste steel slag lay particular emphasis on physical action, and useless magnesium carbon refractory lays particular emphasis on chemical action.
The invention has the beneficial effects as follows:
(1) reduce the oxygen in slag and multiviscosisty slag, shorten and spatter the slag time, improve the effect of slag splashing; In tapping process, converter can be suppressed to foam, prevent from gushing slag from fire door;
(2) the present invention reuses limestone powder, based on calcium carbonate, is aided with other raw materials, and pressure slag is effective;
(3) raw material that the present invention adopts is steelworks, or even the waste in converter production process, not only plays the object turned waste into wealth, and does not need external source to introduce, do not have raw materials cost and transportation cost;
(4) pressure agent of the present invention is applicable to revolving furnace slag pressing, and especially to there being sublance device, the converter of stove and thermometric of need not falling before tapping is especially favourable.
Embodiment
The present invention is described further in conjunction with example.
Embodiment 1:
For 1 120 tons of converter lines, this line configuration has engineered capacity to be the converter 3 of 120 tons, and every day produces discarded magnesium carbon refractory 50 tons, about 600 tons, slag, discarded limestone powder about 70 tons.
Proportioning raw materials (weight ratio): used lime stone flour 65%, waste steel slag 12%, useless magnesium carbon refractory 20%, earth 3%.
1) by waste steel slag and useless magnesium carbon refractory, with jaw crusher, the particle that fragmentation becomes below 30mm is for subsequent use;
2) discarded limestone powder is sieved, remove larger limestone block and other rubbish, screen out below 2mm powder;
3) used lime stone flour, waste steel slag, useless magnesium carbon refractory and earth are added pressure type and stir serial mixer, stirring and evenly mixing, discharging; Mixed material, load in the packing bag of 10Kg, roping is stand-by to converter lines.
In conjunction with the use-case of certain factory's pressure agent
1) the terminal situation of converter
Sublance TSO surveys data: temperature 1656 DEG C; Terminal oxygen 548ppm; End point carbon 0.058%.
2) fire door of tapping after stove gushes slag situation
During tapping, throw away 50kg pressure agent in stove, in stove, Metal Weight is 140 tons, and in stove, foamy slag is inhibited, and fire door is not gushed out slag.
3) slag situation is spattered
Spatter slag after 1 minute, splash slag sheet, 3 point half to spatter slag complete, spatters slag time shorten 25 seconds than the heat without pressure agent.
Embodiment 2
Proportioning raw materials: 60%, waste steel slag 18%, useless magnesium carbon refractory 20%, earth 2%.
Preparation method: with embodiment 1.
Embodiment 3
Proportioning raw materials: 68%, waste steel slag 10%, useless magnesium carbon refractory 20%, earth 2%.
Preparation method: with embodiment 1.
Embodiment 4:
Proportioning raw materials: 61%, waste steel slag 12%, useless magnesium carbon refractory 25%, earth 2%.
Preparation method: with embodiment 1.
Claims (4)
1. the efficient pressure agent of converter, is characterized in that, its component and weight ratio are: used lime stone flour 60 ~ 68%, waste steel slag 10 ~ 18%, useless magnesium carbon refractory 20 ~ 25%, earth 2 ~ 5%.
2. the efficient pressure agent of a kind of converter as claimed in claim 1, is characterized in that, its component and weight ratio are: used lime stone flour 65%, waste steel slag 12%, useless magnesium carbon refractory 20%, earth 3%.
3. the efficient pressure agent of a kind of converter as claimed in claim 1 or 2, is characterized in that, the granularity of described used lime stone flour is 2 ~ 5mm, and the granularity of described waste steel slag and useless magnesium carbon refractory is for being less than 30mm.
4. the preparation method of the efficient pressure agent of the converter described in claim 1 or 2, is characterized in that,
1) waste steel slag steelworks produced and useless magnesium carbon refractory, the particle becoming below 30mm with jaw crusher fragmentation is for subsequent use;
2) used lime stone flour is sieved, obtain the used lime stone flour of 2 ~ 5mm;
3) by after used lime stone flour, waste steel slag, useless magnesium carbon refractory and earth mixing, pack for subsequent use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510137769.2A CN104694690A (en) | 2015-03-27 | 2015-03-27 | Revolving furnace efficient slag pressing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510137769.2A CN104694690A (en) | 2015-03-27 | 2015-03-27 | Revolving furnace efficient slag pressing agent |
Publications (1)
| Publication Number | Publication Date |
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| CN104694690A true CN104694690A (en) | 2015-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510137769.2A Pending CN104694690A (en) | 2015-03-27 | 2015-03-27 | Revolving furnace efficient slag pressing agent |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105385803A (en) * | 2015-11-20 | 2016-03-09 | 武汉钢铁(集团)公司 | Converter final slag modifier and preparing method |
| CN111593162A (en) * | 2020-05-29 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter slag pressing agent and use method thereof |
| CN113215350A (en) * | 2021-05-21 | 2021-08-06 | 新疆八一钢铁股份有限公司 | Slag pressing agent for converter prepared from converter fly ash |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484595A (en) * | 2013-09-17 | 2014-01-01 | 新疆中合大正商贸有限公司 | Production process of magnesian slag pressing agents |
-
2015
- 2015-03-27 CN CN201510137769.2A patent/CN104694690A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484595A (en) * | 2013-09-17 | 2014-01-01 | 新疆中合大正商贸有限公司 | Production process of magnesian slag pressing agents |
Non-Patent Citations (2)
| Title |
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| 解英明: "石灰石作为120t顶底复吹转炉终点钢水调温剂的生产应用", 《特殊钢》 * |
| 龚洪君: "废钢渣用于转炉炼钢压渣调渣的实践与分析", 《四川冶金》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105385803A (en) * | 2015-11-20 | 2016-03-09 | 武汉钢铁(集团)公司 | Converter final slag modifier and preparing method |
| CN111593162A (en) * | 2020-05-29 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter slag pressing agent and use method thereof |
| CN113215350A (en) * | 2021-05-21 | 2021-08-06 | 新疆八一钢铁股份有限公司 | Slag pressing agent for converter prepared from converter fly ash |
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| C06 | Publication | ||
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Application publication date: 20150610 |