CN106834574A - One kind is colded pressing boracic pelletizing blast furnace prepurging solvent and its preparation, application method - Google Patents
One kind is colded pressing boracic pelletizing blast furnace prepurging solvent and its preparation, application method Download PDFInfo
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- CN106834574A CN106834574A CN201710102291.9A CN201710102291A CN106834574A CN 106834574 A CN106834574 A CN 106834574A CN 201710102291 A CN201710102291 A CN 201710102291A CN 106834574 A CN106834574 A CN 106834574A
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- blast furnace
- boracic
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- prepurging
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/04—Making slag of special composition
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to blast furnace prepurging solvent technology field, and in particular to one kind is colded pressing boracic pelletizing blast furnace prepurging solvent and its preparation, application method, boracic pelletizing of colding pressing is prepared from by following component：Ferro-boron concentrate, coal and bonding agent, by each component mixing, pressure ball, drying after, in being put into blast furnace together with other furnace charges, carry out prepurging operation.The boracic pelletizing blast furnace prepurging solvent of colding pressing that the present invention is provided can not only meet the requirement of blast furnace prepurging, and with the advantage such as low cost, addition be few, smaller on the influence of blast furnace process process, can quick-recovery cupola well state soon, so as to avoid erosion of the long-time prepurging to blast furnace lining.
Description
Technical field
The invention belongs to blast furnace prepurging solvent technology field, and in particular to one kind boracic pelletizing blast furnace prepurging of colding pressing is molten
Agent and its preparation, application method.
Background technology
Blast furnace slag making, be exactly ash in the gangue and coke (fuel) in iron ore grade it is low with the flux generation that interacts
The compound of fusing point, forms nonmetallic liquid phase.Slagging regime should be adapted to blast furnace process requirement, be conducive to stable smooth operation, favorably
In smelting high duty pig iron.Each factory's resource is different with working condition, should select rational slagging regime according to crude fuel condition.Blast furnace
Smelting requirements slag should possess following some performance：
1) with good mobility, it is ensured that slag iron passes through dropping zone and separates；
2) ensure iron quality, there is the ability for fully participating in desired chemical reaction, such as [Si], [Mn] or other beneficial units
The reduction of element, absorbs S and alkali metal etc.；
3) can meet allow coal gas pass through and slag-iron, slag-gas good separation dynamic conditions；
4) good stability, resistance smelting condition change is without making Performance of Slag drastically change.
If it can therefore be seen that when the crude fuel condition of blast furnace process changes, such as coke quality declines, in ore
Al2O3Increase of content etc., " channel for permeating liquid " for causing coke is reduced, and slag viscosity increase, slag iron is smooth through dead coke pile
Degree is decreased obviously, i.e. cupola well activity is not normal.So, by the slagging regime of adjustment blast furnace process in time, the stream of slag iron is improved
Dynamic property and stability, it is possible to effectively recover cupola well activity.From the point of view of Conventional wisdom, by adding prepurging flux to adjust slag making
The method of system is to improve one of Performance of Slag, important method of fast quick-recovery cupola well activity.
Traditional prepurging flux has three kinds, is respectively：Acid pellet prepurging, fluorite, manganese ore.The principle and shortcoming of its prepurging
It is as follows：
(1) acidic pellet ore prepurging using its basicity it is low, iron content is high, sulfur-bearing is low, clinker the characteristics of carry out.Concentrate and add
Enter a certain amount of acidic pellet ore, the SiO of free state can be produced2.These SiO2With baroque high-melting-point substances in cupola well
CaO-SiO2Compound reacts, the simple low-melting slag of generating structure, improves the mobile performance of slag, so as to reach place
Manage the purpose of hearth accumulation.But, influence can be produced to the position of blast furnace melting with soft and thickness using acidic pellet ore prepurging, no
Beneficial to the quadratic distribution for improving Gas Flow, there is the trend for deteriorating gas permeability, pressure difference is easily raised, and is unfavorable for that the stabilization of blast fumance is suitable
OK, therefore modern blast furnace typically no longer uses this kind of method when the cupola well such as hearth accumulation activity abnormal accident is processed.
(2) fluorite mainly uses the CaF in fluorite as prepurging flux2, low melting point can be formed with hearth accumulation thing
Compound, improves the mobile performance of slag, so as to clean furnace wall adhesive.But fluorite is to eliminating the heap that cupola well graphitic carbon is formed
Product, effect is undesirable.And fluorite can also produce serious corrosion function to the furnace lining of silica-aluminum materialses, long-term use can be destroyed
Furnace lining and cooling wall, seriously threaten prolonging campaign, are uneconomic prepurging modes, are gradually eliminated.
(3) manganese ore prepurging is because the blast-furnace slag that MnO and its silicate of formation are constituted can effectively reduce slag
Fusing point.Therefore the content of MnO in slag is improved, slag viscosity can be reduced in the range of finite concentration, improve the stream of slag
Dynamic property.But manganese ore prepurging, in molten iron the recovery of manganese be by MnO slags by dead coke pile when with coke direct-reduction to occur anti-
Should, the reaction not only needs to absorb substantial amounts of heat, and largely consumes carbon, coke ratio is significantly raised.It was verified that the pig iron
Middle manganese content often increases by 0.1%, and coke ratio will increase 2kg/t or so, causes to influence yield about 0.3%；And manganese ore price is higher,
So as to increasing considerably smelting cost in terms of two, it is seen that using the cost of manganese ore prepurging be also very huge.
The content of the invention
In order to solve the above-mentioned technical problem, colded pressing boracic pelletizing blast furnace prepurging solvent and its system the invention provides one kind
Standby, application method, can not only meet the requirement of blast furnace prepurging, and with low cost, addition it is few, to blast furnace process process
The influence advantage such as smaller, can quick-recovery cupola well state soon, so as to avoid erosion of the long-time prepurging to blast furnace lining.
The present invention is achieved in that offer one kind is colded pressing boracic pelletizing blast furnace prepurging solvent, prepared by following component and
Into：Ferro-boron concentrate, coal and bonding agent.
Further, in above-mentioned boracic pelletizing blast furnace prepurging solvent of colding pressing, by mass percentage, ferro-boron concentrate accounts for 55~
63%th, coal accounts for 30~40%, bonding agent and accounts for 5~7%.
Further, in above-mentioned boracic pelletizing blast furnace prepurging solvent of colding pressing, the coal is coal dust, and the bonding agent is swelling
One or more in soil, organic compound binder, waterglass.
Present invention also offers a kind of method for preparing above-mentioned boracic pelletizing blast furnace prepurging solvent of colding pressing, including following step
Suddenly：
1) ferro-boron concentrate, coal and bonding agent are proportionally put into batch mixer carries out batch mixing；
2) by step 1) in batch mixing be put into pressure ball carried out to roll-in ball machine, temperature is 15 DEG C, and pressure is 35Mpa；
3) by step 2) in the boracic pelletizing that presses be put into drying machine drying, temperature is 105 DEG C, and drying time is 10 small
When, it is made finished product and colds pressing boracic pelletizing.
It is above-mentioned cold pressing boracic pelletizing blast furnace prepurging solvent application method be by it is described cold pressing boracic pelletizing and furnace charge according to
Certain proportion is put into the blast furnace of hearth accumulation simultaneously, carries out prepurging operation, recovers cupola well activated state.
Compared with prior art, it is an advantage of the current invention that can not only meet the requirement of blast furnace prepurging, and with into
The advantage such as this low, addition is few, smaller on the influence of blast furnace process process, can quick-recovery cupola well state soon, during so as to avoiding long
Between erosion of the prepurging to blast furnace lining；The price of ferro-boron concentrate is only the 50%~60% of manganese ore price, can substantially reduce and wash
Stove cost, and boron element is beneficial element for follow-up steel-making, can reduce the cost of follow-up steel-making.
Brief description of the drawings
Fig. 1 is different B2O3Content slag viscosity and temperature relation；
Fig. 2 is B2O3Influence of the content to slag melting degree warm in nature.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The mechanism for carrying out blast furnace prepurging using boracic pelletizing of colding pressing is：Why boracic pelletizing can effectively reduce slag is glued
Degree and melting temperature, are due to generating low melting point CaOB in slag2O3, fusing point is 1150 DEG C, so as to increased liquid
The degree of superheat of state slag.And with B in slag2O3The increase of content, oxygen ion concentration is also increasing in slag, and oxonium ion promotees
Slag silicon-oxy tetrahedron network structure is started depolymerization, oxonium ion is more, depolymerization it is complete, slag is from labyrinth to simple knot
Structure develops, and with increasing for the single silicon-oxy tetrahedron that can be flowed freely, slag viscosity now will be significantly reduced, flowing
Property is significantly improved.
The ratio of each component is different in what different blast furnaces was applicable cold pressing boracic pelletizing, with the actual working of a furnace of blast furnace and slag
Based on structure, it is considered to different B2O3The influence of Content on BF Slag mobile performance, had not only ensured prepurging effect but also had avoided resource wave
Take, and then B optimal in determination slag2O3Content, the B in the boracic pelletizing that goes out to cold pressing according to MaterialBalance Computation2O3Contain
Amount, according to boron-containing iron concentrate, coal dust, binding agent composition, determine the proportioning of ferro-boron concentrate, coal dust and binding agent, and then produce
Go out the boracic pelletizing of colding pressing of target content.
Embodiment 1,
One kind is colded pressing boracic pelletizing blast furnace prepurging solvent, including following component：By mass percentage, ferro-boron concentrate
55%th, coal 40%, bonding agent 5%.
The method for preparing above-mentioned boracic pelletizing of colding pressing, comprises the following steps：
1) ferro-boron concentrate, coal and bonding agent are proportionally put into batch mixer carries out batch mixing；
2) by step 1) in batch mixing be put into pressure ball carried out to roll-in ball machine, temperature is 15 DEG C, and pressure is 35Mpa；
3) by step 2) in the boracic pelletizing that presses be put into drying machine drying, temperature is 105 DEG C, and drying time is 10 small
When, it is made finished product and colds pressing boracic pelletizing.
Boracic pelletizing and furnace charge are colded pressing according to a certain percentage while being put into the blast furnace of hearth accumulation by what is prepared, carry out prepurging
Operation, recovers cupola well activated state.
Embodiment 2,
One kind is colded pressing boracic pelletizing blast furnace prepurging solvent, including following component：By mass percentage, ferro-boron concentrate
59%th, coal dust 35%, binding agent 6%.
The method for preparing above-mentioned boracic pelletizing of colding pressing is same as Example 1.
Boracic pelletizing and furnace charge are colded pressing according to a certain percentage while being put into the blast furnace of hearth accumulation by what is prepared, carry out prepurging
Operation, recovers cupola well activated state.
Embodiment 3,
One kind is colded pressing boracic pelletizing blast furnace prepurging solvent, including following component：By mass percentage, ferro-boron concentrate
63%th, coal dust 30%, binding agent 7%.
The method for preparing above-mentioned boracic pelletizing of colding pressing is same as Example 1.
Boracic pelletizing and furnace charge are colded pressing according to a certain percentage while being put into the blast furnace of hearth accumulation by what is prepared, carry out prepurging
Operation, recovers cupola well activated state.
By using the present invention, the mobile performance of slag can be effectively improved, so as to reach the purpose of prepurging.Fig. 1 and Fig. 2
It is to be measured respectively by physical properties of melt comprehensive tester, different B2O3Content slag viscosity with temperature curve and melting temperature change
Change curve, it will be seen from figure 1 that with B2O3The increase of content, slag viscosity is substantially to reduce.Especially work as B2O3Content reaches
During to 3.0%, the viscosity of slag compares B2O3Content be 0~2.0% slag have substantially reduction, and slag viscosity with temperature
The change curve of degree is steady many, and the high-temperature region viscosity number more than 1400 DEG C is even kept approximately constant, and illustrates the composition
Slag reached good mobility and stability.
As seen from Figure 2, the melting temperature of slag specimen is with B in slag2O3The increase of content is gradually reduced, explanation
B2O3Addition the high temperature properties of slag is tended towards stability.From the point of view of the tendency of boracic slag melting temperature, the B in slag2O3Content
Increase to during 0.8% from 0, slag melting property temperature decrease rate is essentially identical, the B in slag2O3Content increases from 0.8%
It is added to during 1.0%, slag melting property temperature decrease rate is accelerated, and works as B in slag2O3Content is further added by by 1.0%
When 2.0%, slag melting property temperature decrease rate slows down again.As B in slag specimen2O3When content reaches 3.0%, slag has not had
Obvious viscosity flex point, the mobility of slag has been different from the property of general blast furnace caustic slag, therefore without melting temperature.Should
Although composition slag has good mobility and stability, in actual blast furnace process, the slag of the composition is by Solid State Transformation
For the temperature of liquid is too low, can raise blast furnace melting with soft, slag brings cupola well shortage of heat into and causes stove cool, therefore nor
The optimal components of slag.If only considering to influence slag melting degree warm in nature, B2O3Content in slag is maintained at 1.0~
When 2.0%, the melting temperature of slag is proper at 1300~1310 DEG C.
In summary, B2O3Fluxing and diluting effect, B can be played in blast furnace slag2O3Most preferably containing in prepurging slag
Amount should be 1.0~2.0%, and now, in 0.3Pa.s or so, melting temperature is 1300~1310 for viscosity of the slag at 1500 DEG C
Between DEG C, the increase of the slag degree of superheat, the mobility and stability of slag are become better, and meet the requirement of prepurging flux.
Application examples,
The prepurging solvent provided using the present invention carries out prepurging operation to domestic certain blast furnace, recovers the index such as table 1 of the working of a furnace
It is shown, it can be seen that with the carrying out that prepurging is operated, blast furnace indices are obtained for good recovery.
Certain 4747m of the country of table 13Blast furnace prepurging recovers working of a furnace monthly average economic technology leading indicator
Claims (5)
1. one kind is colded pressing boracic pelletizing blast furnace prepurging solvent, it is characterised in that be prepared from by following component：Ferro-boron concentrate, coal
And bonding agent.
2. as claimed in claim 1 boracic pelletizing blast furnace prepurging solvent of colding pressing, it is characterised in that by mass percentage, boron
Iron ore concentrate accounts for 55~63%, coal and accounts for 30~40%, bonding agent and accounts for 5~7%.
3. as claimed in claim 1 boracic pelletizing blast furnace prepurging solvent of colding pressing, it is characterised in that the coal is coal dust, described
Bonding agent is one or more in bentonite, organic compound binder, waterglass.
4. a kind of method of the boracic pelletizing blast furnace prepurging solvent of colding pressing prepared as described in claim 1-3 is any, its feature exists
In comprising the following steps：
1) ferro-boron concentrate, coal and bonding agent are proportionally put into batch mixer carries out batch mixing；
2) by step 1) in batch mixing be put into pressure ball carried out to roll-in ball machine, temperature is 15 DEG C, and pressure is 35Mpa；
3) by step 2) in the boracic pelletizing that presses be put into drying machine drying, temperature is 105 DEG C, and drying time is 10 hours, system
Colded pressing boracic pelletizing into finished product.
5. a kind of application method of boracic pelletizing blast furnace prepurging solvent of colding pressing as described in claim 1-3 is any, its feature exists
In, boracic pelletizing and furnace charge are colded pressing according to a certain percentage while being put into the blast furnace of hearth accumulation by described, prepurging operation is carried out, it is extensive
Multiple cupola well activated state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710102291.9A CN106834574A (en) | 2017-02-24 | 2017-02-24 | One kind is colded pressing boracic pelletizing blast furnace prepurging solvent and its preparation, application method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710102291.9A CN106834574A (en) | 2017-02-24 | 2017-02-24 | One kind is colded pressing boracic pelletizing blast furnace prepurging solvent and its preparation, application method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110453024A (en) * | 2019-09-19 | 2019-11-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Boracic slag system containing manganese for blast furnace process |
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| CN101613798A (en) * | 2009-07-24 | 2009-12-30 | 张旭东 | Ironmaking additive and preparation method thereof |
| CN102251064A (en) * | 2011-07-08 | 2011-11-23 | 北京科技大学 | Method for improving high-aluminum slag fluidity in blast furnace ironmaking process |
| CN102337394A (en) * | 2011-09-22 | 2012-02-01 | 王铮 | Composition for fabricating pellets |
| CN103276126A (en) * | 2013-06-05 | 2013-09-04 | 北京科技大学 | Method for improving liquidity of high titanium slag in blast furnace smelting vanadium titano-magnetite |
| CN105925738A (en) * | 2016-07-13 | 2016-09-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Environmental-friendly modifier for high titania bearing blast furnace slag and modifying method of environmental-friendly modifier |
-
2017
- 2017-02-24 CN CN201710102291.9A patent/CN106834574A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613798A (en) * | 2009-07-24 | 2009-12-30 | 张旭东 | Ironmaking additive and preparation method thereof |
| CN102251064A (en) * | 2011-07-08 | 2011-11-23 | 北京科技大学 | Method for improving high-aluminum slag fluidity in blast furnace ironmaking process |
| CN102337394A (en) * | 2011-09-22 | 2012-02-01 | 王铮 | Composition for fabricating pellets |
| CN103276126A (en) * | 2013-06-05 | 2013-09-04 | 北京科技大学 | Method for improving liquidity of high titanium slag in blast furnace smelting vanadium titano-magnetite |
| CN105925738A (en) * | 2016-07-13 | 2016-09-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Environmental-friendly modifier for high titania bearing blast furnace slag and modifying method of environmental-friendly modifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110453024A (en) * | 2019-09-19 | 2019-11-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Boracic slag system containing manganese for blast furnace process |
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Application publication date: 20170613 |