CN105132613A - Application of coal gangue used as converter slag inhibiting agent, and converter slag inhibiting method - Google Patents
Application of coal gangue used as converter slag inhibiting agent, and converter slag inhibiting method Download PDFInfo
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- CN105132613A CN105132613A CN201510619822.2A CN201510619822A CN105132613A CN 105132613 A CN105132613 A CN 105132613A CN 201510619822 A CN201510619822 A CN 201510619822A CN 105132613 A CN105132613 A CN 105132613A
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- slag
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- coal gangue
- presses down
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Abstract
The invention discloses the application of coal gangue used as a converter slag inhibiting agent, and a converter slag inhibiting method. According to the method, coal gangue is used as slag inhibiting agent base materials; when slag inhibition is performed during blowing, steel of 1-2kg/ton is added every time; when slag inhibition is performed during furnace inversion and steel tapping, steel of 0.2-0.5kg/ton is added every time. A good slag inhibiting effect can be reached by a small quantity of the slag inhibiting agent, and the splash during converter blowing can be effectively controlled. Because the price of raw materials is low, and a processing technology is simple, the cost of the slag inhibiting agent only accounts for 10-30% of that of a conventional technology; the waste of raw coal or magnesium resources is effectively avoided. Aiming at the problems of over-high soft blowing of iron oxides during blowing, difficult converter inversion at a blowing end, and slag overflow in steel tapping after reblowing, according to the method, the slag inhibiting agent is added, so that slag iron oxides can be effectively reduced, and the purposes for controlling splash and quickly tapping steel are reached. The method does not have bad influences on the environment, and besides, resources are saved, and cost is reduced, so that the method has a popularization and application value in steelmaking production plants.
Description
Technical field
What the present invention relates to a kind of steel-making converter converting process presses down slag technology, and especially a kind of coal gangue presses down slag application as converter and converter presses down the method for slag.
Background technology
In converter production process, in slag, FeO has important effect for the fusing of slag and the control etc. of phosphorus content.But usually because slag FeO in process is too high in actual production, the reaction of slag steel is uneven brings problems to smelting.The too high iron loss that causes of FeO is high; Converting process splash risk increases, contaminate environment; Reduce slag desulfurization capacity; Improve the oxidisability of molten steel, steel quality and resistance to material are impacted; , there is certain potential safety hazard in catch carbon deslagging and tapping difficulty.
Suppress the too high method of FeO to be generally and use containing carbon, magnesite and carry out pressure Slag treatment after sintering the raw material pressure balls such as magnesium powder; Shoudu Iron and Steel Co adopts steam coal as raw material, carries out pressure slag operation after pressure ball.These two kinds of methods all can obtain good effect, but due to complex process, after the links such as pressure ball, cost increases considerably, and the economy of this technique is a greater impact; Waste resource.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of technique is simple, cost is low coal gangue presses down slag agent application as converter; Present invention also offers a kind of method that converter presses down slag.
For solving the problems of the technologies described above, the technical solution used in the present invention is: coal gangue presses down the application of slag agent in the process of bessemerizing as converter.
Coal gangue of the present invention is the base-material that converter presses down slag agent.
The mass percentage of coal gangue main component of the present invention is: SiO
230% ~ 51%, Al
2o
315% ~ 25%, Fe
2o
32% ~ 8%, CaO1% ~ 4%, MgO1% ~ 3%, C20% ~ 30%, S < 1%.
Also containing water 6 ~ 10wt% in coal gangue of the present invention.
In coal gangue of the present invention: the content≤10wt% of the content≤10wt% of the content >=80wt% between granularity 30mm ~ 50mm, below granularity 10mm, granularity 10mm ~ 30mm.
The mechanism of action of Main chemical component of the present invention is:
Si0
2+ Al
2o
3: the component of adjustment foamy slag, reduces its fusing point, reduces the foaminess of local slag.
C: react with the FeO in converter slag, reduces the FeO content of slag, increases the surface tension of slag thus controls foamy slag generation; Involved chemical reaction is shown in formula ():
C+ (FeO)=Fe+CO(mono-).
Water function: coal gangue is when entering converter slag, and because the effect of high temperature and moisture bursts rapidly, cracked fritter is pressed down slag agent and is transported to each corner, molten bath by its kinetic energy produced, and reaction area increases considerably and can destroy the bubble formed; Make to press down slag effect to increase considerably.Consider transport, the reasons such as storage, moisture controlled is at 6 ~ 10wt%.
S:S content is the impurity that raw material is brought into, and in the present invention, S content requirement is less than 1wt%.
Granularity: consider to press down the factors such as the reactivity of slag agent and feeding apparatus, basic Task-size Controlling 30 ~ 50mm, considers that material fundamental characteristics to allow between below granularity 10mm 10%, 10mm ~ 30mm 10%.
The inventive method is: adopt coal gangue as pressing down slag agent base-material, and when converting process presses down slag, each add-on is 1 ~ 3kg/ ton steel, falls stove and tapping process each add-on 0.2 ~ 0.5kg/ ton steel when pressing down slag.
In the inventive method, bessemerize before 40%, add when pressing down slag at every turn and press down slag agent 1 ~ 2kg/ ton steel.
In the inventive method, bessemerize after 40%, add when pressing down slag at every turn and press down slag agent 1 ~ 3kg/ ton steel.
In the inventive method, blow end point adds after carrying rifle and presses down slag agent 1 ~ 2kg/ ton steel, direct tapping after calm 10 ~ 30s.
The beneficial effect adopting technique scheme to produce is: the present invention uses a small amount of but but slag agent can reach preferably slag effect; Can effectively control to bessemerize process splash.Due to low in raw material price, complete processing is simple, and the cost pressing down slag agent is only 10% ~ 30% of former technique; And efficiently avoid the waste of raw coal or magnesium resource.
The inventive method is for the too high soft blow of converting process ferric oxide, and the blow end point difficulty of falling stove, after re-blowing, tapping is overflow the situation such as slag, adds above-mentionedly to press down slag agent, can effectively reduce slag oxidation iron, reach the object controlling splash, tapping fast.The inventive method has no adverse effects to environment, and has saved resource and reduce cost, in STEELMAKING PRODUCTION factory, have application value.
Embodiment
The method that this converter presses down slag adopts coal gangue as pressing down slag agent base-material, converting process generation converter carbon monoxide curve abnormality raises, reduce rapidly or caused fire door overflow slag time, need to add and press down slag agent and carry out pressing down slag, each add-on is 1 ~ 3kg/ ton steel; Wherein, when occurring before bessemerizing 40%, add and press down slag agent 1 ~ 2kg/ ton steel, be preferably 1kg/ ton steel; When occurring after bessemerizing 40%, add and press down slag agent 1 ~ 3kg/ ton steel, be preferably 2kg/ ton steel.The mode that blow end point can adopt deslagging to tap; Also preferably can adopt after carrying rifle and add but slag agent 1 ~ 2kg/ ton steel, the mode of not deslagging direct tapping after calm 10 ~ 30s; Preferably add and press down slag agent 1kg/ ton steel, direct tapping after calm 10s.This converter presses down the method for slag when stove and tapping process need to press down slag, and each add-on pressing down slag agent is 0.2 ~ 0.5kg/ ton steel.
The mass percentage of coal gangue main component of the present invention is: SiO
230% ~ 51%, Al
2o
315% ~ 25%, Fe
2o
32% ~ 8%, CaO1% ~ 4%, MgO1% ~ 3%, C20% ~ 30%, S < 1%, water 6 ~ 10wt%, and other impurity.Wherein, the content≤10wt% of content≤10wt%, the 10mm < granularity≤30mm of the content >=80wt% between 30mm < granularity≤50mm, granularity≤10mm.
Below in conjunction with specific embodiment, the present invention is further detailed explanation.In following embodiment, the coal gangue of component content in table 1 is adopted to press down slag agent base-material as converter.
Table 1: each embodiment is used presses down slag agent component content (wt%)
Embodiment 1: the method that this converter presses down slag adopts following concrete processing step.
100 tons of converter routines are smelted; Enter stove molten iron C content 4.23wt%, Si content 0.66wt%, P content 0.0133wt%, Ti content 0.008wt%, molten iron temperature 1320 DEG C.Weight of molten iron 105.3 tons, steel scrap weight is 15.2 tons.
Higher owing to entering stove molten iron silicon content, Converter Oxigen Blowing amount to 25% time, flue gas detecting system display CO content ramp-up rate is accelerated, and indicates splash risk; Added by high hopper and press down slag agent 100kg, other technique continues to automatically perform according to model specification, and CO recovers normal containing discharge curve, and slag splash of overflowing early stage does not occur.Terminal situation: terminal C is 0.054wt%, P is 0.013wt%, and temperature is 1646 DEG C; Terminal point control is good, whole hit, the full iron 15.6wt% of finishing slag.
Embodiment 2: the method that this converter presses down slag adopts following concrete processing step.
100 tons of converter routines are smelted; Enter stove molten iron C content 4.33%, Si content 0.42%, P content 0.0130%, Ti content 0.008%, molten iron temperature 1240 DEG C.Weight of molten iron 105.8 tons, steel scrap weight is 15.9 tons.
On the low side owing to entering stove molten iron temperature, Converter Oxigen Blowing amount to 30% time, flue gas detecting system display CO all the time lower than 30%, because the low FeO of bath temperature assembles in a large number, indicate splash risk; Added by high hopper and press down slag agent 150kg, other technique continues to automatically perform according to model specification, and CO recovers normal containing discharge curve, and slag splash of overflowing early stage does not occur.Terminal situation: terminal C is 0.050%, P is 0.011%, and temperature is 1650 DEG C; Terminal point control is good, whole hit, the full iron 14.9% of finishing slag.
Embodiment 3: the method that this converter presses down slag adopts following concrete processing step.
100 tons of converter routines are smelted; Enter stove molten iron C content 4.25%, Si content 0.50%, P content 0.0125%, Ti content 0.028%, molten iron temperature 1335 DEG C.Weight of molten iron 104.3 tons, steel scrap weight is 16.2 tons.
Too fast owing to entering stove molten iron Ti content higher molten bath heat-up rate, Converter Oxigen Blowing amount to 25% time, flue gas detecting system display CO content ramp-up rate is accelerated, and indicates splash risk; Added by high hopper and press down slag agent 200kg, other technique continues to automatically perform according to model specification, and CO recovers normal containing discharge curve, and slag splash of overflowing early stage does not occur.Terminal situation: terminal C is 0.044%, P is 0.015%, and temperature is 1656 DEG C; Terminal point control is good, whole hit, the full iron 14.6% of finishing slag.
Embodiment 4: the method that this converter presses down slag adopts following concrete processing step.
100 tons of converter routines are smelted; Enter stove molten iron C content 4.25%, Si content 0.49%, P content 0.0125%, Ti content 0.008%, molten iron temperature 1335 DEG C.Weight of molten iron 104.3 tons, steel scrap weight is 16.2 tons.
Converter Oxigen Blowing amount to 75% time, flue gas detecting system display CO content reduces fast, and indication starts FeO enrichment occurs in molten bath, has explosive splash risk; Added by high hopper and press down slag agent 200kg, and reduce rifle position 150mm, reduce oxygen-supplying amount 2000m
3/ h, other technique continues to automatically perform according to model specification, and CO recovers normal containing discharge curve, and excessive slag splash does not occur.Terminal situation: terminal C is 0.045%, P is 0.016%, and temperature is 1652 DEG C; Terminal point control is good, whole hit, the full iron 16.1% of finishing slag.
Embodiment 5: the method that this converter presses down slag adopts following concrete processing step.
100 tons of converter routines are smelted; Enter stove molten iron C content 4.25%, Si content 0.49%, P content 0.0125%, Ti content 0.008%, molten iron temperature 1335 DEG C.Weight of molten iron 104.3 tons, steel scrap weight is 16.2 tons.
Higher owing to entering stove molten iron silicon content, Converter Oxigen Blowing amount to 60% time, flue gas detecting system display CO content ramp-up rate is accelerated, and indicates splash risk; Added by high hopper and press down slag agent 300kg, other technique continues to automatically perform according to model specification, and CO recovers normal containing discharge curve, and excessive slag splash does not occur.Bessemerize terminal situation: terminal C is 0.055%, P is 0.016%, and temperature is 1652 DEG C.Added by high hopper after rifle is carried in converter and press down slag agent 100kg, after 10S, do not carry out the direct grate tapping of deslagging.There is not excessive slag situation in fire door.
Embodiment 6: the method that this converter presses down slag adopts following concrete processing step.
100 tons of converter routines are smelted.Bessemerize terminal situation: terminal C is 0.055%, P is 0.016%, and temperature is 1652 DEG C; Because slag foamed seriously cannot sample by grate thermometric; Artificial input in stove in stokehold presses down slag agent 20kg, and slag bubble level reduces rapidly, can complete thermometric sampling smoothly.
Embodiment 7: the method that this converter presses down slag adopts following concrete processing step.
100 tons of converter routines are smelted.Bessemerize terminal situation: terminal C is 0.051%, P is 0.012%, and temperature is 1655 DEG C; Because slag foamed seriously cannot sample by grate thermometric; Artificial input in stove in stokehold presses down slag agent 50kg, and slag bubble level reduces rapidly, can complete thermometric sampling smoothly.
Claims (9)
1. coal gangue presses down the application of slag agent in the process of bessemerizing as converter.
2. coal gangue according to claim 1 presses down the application of slag agent as converter, it is characterized in that: described coal gangue is the base-material that converter presses down slag agent.
3. coal gangue according to claim 2 presses down the application of slag agent as converter, and it is characterized in that, the mass percentage of described coal gangue main component is: SiO
230% ~ 51%, Al
2o
315% ~ 25%, Fe
2o
32% ~ 8%, CaO1% ~ 4%, MgO1% ~ 3%, C20% ~ 30%, S < 1%.
4. coal gangue according to claim 2 presses down the application of slag agent as converter, it is characterized in that: also containing water 6 ~ 10wt% in described coal gangue.
5. the coal gangue according to Claims 2 or 3 presses down the application of slag agent as converter, it is characterized in that, in described coal gangue: the content≤10wt% of the content≤10wt% of the content >=80wt% between granularity 30mm ~ 50mm, below granularity 10mm, granularity 10mm ~ 30mm.
6. converter presses down the method for slag, it is characterized in that: adopt coal gangue as pressing down slag agent base-material, and when converting process presses down slag, each add-on is 1 ~ 3kg/ ton steel, falls stove and tapping process each add-on 0.2 ~ 0.5kg/ ton steel when pressing down slag.
7. converter according to claim 6 presses down the method for slag, it is characterized in that: bessemerize before 40%, adds at every turn and press down slag agent 1 ~ 2kg/ ton steel when pressing down slag.
8. converter according to claim 6 presses down the method for slag, it is characterized in that: bessemerize after 40%, adds at every turn and press down slag agent 1 ~ 3kg/ ton steel when pressing down slag.
9. the converter according to claim 6,7 or 8 presses down the method for slag, it is characterized in that: blow end point adds after carrying rifle and presses down slag agent 1 ~ 2kg/ ton steel, direct tapping after calm 10 ~ 30s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510619822.2A CN105132613B (en) | 2015-09-25 | 2015-09-25 | The application and converter that gangue presses down slag agent as converter press down the method for slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510619822.2A CN105132613B (en) | 2015-09-25 | 2015-09-25 | The application and converter that gangue presses down slag agent as converter press down the method for slag |
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| Publication Number | Publication Date |
|---|---|
| CN105132613A true CN105132613A (en) | 2015-12-09 |
| CN105132613B CN105132613B (en) | 2017-10-10 |
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|---|---|---|---|
| CN201510619822.2A Active CN105132613B (en) | 2015-09-25 | 2015-09-25 | The application and converter that gangue presses down slag agent as converter press down the method for slag |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1121114A (en) * | 1994-10-20 | 1996-04-24 | 刘德生 | Slag pressing agent for oxygen top-blown converter and production method thereof |
| CN102212639A (en) * | 2011-05-24 | 2011-10-12 | 大石桥市荣源镁矿有限公司 | Converter foamed slag pressing agent and using method thereof |
| CN102787201A (en) * | 2012-08-31 | 2012-11-21 | 首钢京唐钢铁联合有限责任公司 | Application of coal as steelmaking slag pressing agent and method for inhibiting steel slag foaming |
| CN104531938A (en) * | 2014-12-19 | 2015-04-22 | 新疆八一钢铁股份有限公司 | Method for applying slag pressing agent produced by blast furnace gun mud to converter steelmaking |
-
2015
- 2015-09-25 CN CN201510619822.2A patent/CN105132613B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1121114A (en) * | 1994-10-20 | 1996-04-24 | 刘德生 | Slag pressing agent for oxygen top-blown converter and production method thereof |
| CN102212639A (en) * | 2011-05-24 | 2011-10-12 | 大石桥市荣源镁矿有限公司 | Converter foamed slag pressing agent and using method thereof |
| CN102787201A (en) * | 2012-08-31 | 2012-11-21 | 首钢京唐钢铁联合有限责任公司 | Application of coal as steelmaking slag pressing agent and method for inhibiting steel slag foaming |
| CN104531938A (en) * | 2014-12-19 | 2015-04-22 | 新疆八一钢铁股份有限公司 | Method for applying slag pressing agent produced by blast furnace gun mud to converter steelmaking |
Non-Patent Citations (1)
| Title |
|---|
| 环境保护部环境工程评估中心: "《我国煤炭行业环境管理与技术研究》", 31 March 2013, 中国环境科学出版社 * |
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