CN108842035A - A kind of manufacturing method of steelmaking converter steel slag deoxidizing ball - Google Patents
A kind of manufacturing method of steelmaking converter steel slag deoxidizing ball Download PDFInfo
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- CN108842035A CN108842035A CN201810623131.3A CN201810623131A CN108842035A CN 108842035 A CN108842035 A CN 108842035A CN 201810623131 A CN201810623131 A CN 201810623131A CN 108842035 A CN108842035 A CN 108842035A
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- ball
- steel
- slag
- deoxidizing
- deoxidizing ball
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of manufacturing methods of steelmaking converter steel slag deoxidizing ball to be mixed using coke powder, Fluorspar Powder and binder as raw material using mixing equipment, and the finished product of diameter 15mm-20mm is pressed by ball press, stand-by after natural drying.After pneumatic steelmaking mentions rifle, converter is added in deoxidizing ball by charging system, since deoxidizing ball density and steel slag are close, deoxidizing ball floats on steel slag surface, carbonaceous material in deoxidizing ball reacts production carbon dioxide gas with oxygen in steel and excludes, and the generation of foamed slag in reaction process can be effectively suppressed in the middle Fluorspar Powder of deoxidizing ball.Compared with deoxidation mode method, slag produced from steel-smelting deoxidizing ball does not generate secondary pollution in deoxidation process, manufacturing cost is cheap, the pollution of molten steel will not be caused, manufacturing method is easy, quick, can be effectively reduced steelmaking process metal loss, reduce the additional amount of light dolomite, the corrosion resistance of slag splashing layer is improved, to reduce steel-making cost, improves steel-making steel quality.
Description
Technical field
The invention belongs to technical field of steel production, are related to converter slag, specifically a kind of steelmaking converter steel slag deoxidizing ball
Manufacturing method and its application.
Background technique
Steelmaking process at present, converter slag do not carry out pre-deoxidation processing, which has the following defects：1, it does not take off
Iron oxide is higher in the converter slag slag of oxygen, cause smelting process metal loss larger, and steel technology rises, 2, non-deoxidation
Since iron oxide content is higher in converter slag, the viscosity and fusing point of steel slag are relatively low, cause to splash the decline of slag blanket corrosion resistance, right
It is unfavorable in the longevity control of converter, 3, iron oxide content is higher in the converter slag of non-deoxidation, cause the full of magnesia in steel slag
Rise with degree, in order to reach the magnesia saturation degree of slag splashing requirement, magnesia additional amount need to be increased, cause cost increase,
4, in a basic balance in oxygen content and steel in the converter slag slag of non-deoxidation, oxygen content in steel can not be reduced.Now with product matter
Amount requires increasingly to improve, and makes steel resistance to auxiliary material cost and remains high, selects the converter slag deoxidation mode of environment-friendly high-efficiency, be conducive to refine
The promotion of steel cost being greatly reduced with product quality.
Summary of the invention
In order to solve the problems, such as to use merely coke powder to carry out, difficulty is added in deoxidation to the present invention and foamed slag is serious, is provided
A kind of low in cost, manufacturing method of steelmaking converter steel slag deoxidizing ball for achieving noticeable achievement.
The present invention is achieved by the following scheme：A kind of manufacturing method of steelmaking converter steel slag deoxidizing ball, including it is following
Step：
Step（1）It is original that the coke powder and granularity 1-5mm, Calcium Fluoride Content for choosing granularity 1-3mm, which are lower than 75% Fluorspar Powder below,
Material, the waterglass for choosing aqueous 50% is binder；
Step（2）Using coke powder, Fluorspar Powder and waterglass as raw material, use mass percent for 70-80: 20-30 :2-3's
Proportion is pressed into the finished product of diameter 15mm-20mm by ball press, and intensity is in 800N or more, by stand-by after spontaneously drying.
Step of the present invention（1）In, the coke powder is that the screenings of ironmaking coke processes gained.
The method for carrying out deoxidation using the steelmaking converter steel slag deoxidizing ball of the above-mentioned manufacture of the present invention, specifically includes following step
Suddenly：
Step（1）In, deoxidizing ball is packed by specified feed bin by charging belt, requires 5% or less chip index after reaching feed bin；
Step（2）In, it after converter smelting, is prejudged by terminal, according to molten steel endpoint carbon content according to 0.6kg/t-
Deoxidizing ball is added in converter 1.4kg/t.
Step（2）In, the additional amount 0.6kg/t-1.4kg/t of the deoxidizing ball, corresponding to 0.06% or more molten steel terminal
Carbon content.
Step（2）In, the additional amount of the deoxidizing ball is in terms of the carbon mass percentage of molten steel terminal：0.07%, deoxidizing ball
Additional amount 1.0-kg/t-1.4kg/t, 0.08-0.09%, deoxidizing ball additional amount 0.8kg/t-1.0kg/t ,≤0.10%, deoxidizing ball
Additional amount 0.6kg/t-0.8kg/t.
Step of the present invention（2）In, after pneumatic steelmaking mentions rifle, deoxidizing ball is added by converter, deoxidizing ball by charging system
It is suspended in steel slag surface, the carbonaceous material in deoxidizing ball reacts production carbon dioxide gas discharge, deoxidizing ball with the oxygen in steel slag
Middle Fluorspar Powder powder inhibit reaction process in foamed slag generation.
Compared with prior art, the invention has the advantages that：
1. the present invention is avoided by obtaining with existing simple compared using coke powder and causes major part by blower by feed bin addition
Take utilization rate away and reduce, avoid it is simple coke powder is added after concentrate on steel slag local surfaces, deoxygenation surface of concentration bits are glutinous
The carbon dioxide gas that degree is big, reaction generates is difficult to be discharged, foam scorification is serious, and tapping process fire door is caused to overflow slag, molten steel matter
The uncontrollable phenomenon of amount occurs.
2. the present invention passes through effective preparation of coke powder, Fluorspar Powder and binder, it is added after being pressed into deoxidizing ball, monomer material
Quality increases, and solves the problems, such as that material is inconvenient since weight kicks the beam and is added；And spherical shape deoxidizing ball adition process randomness is larger,
After the deoxidizing ball that ensure that the uniformity being distributed when addition on steel slag surface, and be pressed into sphere is added, from the surface of deoxidizing ball
Start gradually to be reacted, deoxidizing ball is small compared with pulvis with steel slag specific surface area, the amount of the carbon dioxide generated in the unit time
Discharge capacity reduces compared with pulvis, effectively controls the discharge capacity of carbon dioxide gas, it is suppressed that the probability that foamed slag generates.Its
In, coke powder deoxidation generates carbon dioxide, and the effective component calcirm-fluoride of Fluorspar Powder can reduce reaction interface bits viscosity, ensure that
Carbon dioxide gas is smoothly discharged, it is suppressed that foam scorification trend, avoid fire door overflow slag the problem of.Invention achieves effective
The cycle stretch-out of carbon deoxygenation is controlled into carbon dioxide gas by control reaction interface and reaction interface bits viscosity
Unit time generate total amount；By controlling the viscosity of the bits of reaction interface, guarantees that carbon dioxide gas is smoothly discharged, reach
The purpose for inhibiting foamed slag to generate is arrived.The present invention controls reaction interface total amount, avoids reaction by control material form
Concentration carry out, until which continues to that tapping terminates, can effectively reduce the oxygen content in steel slag iron oxide and steel.
3. slag produced from steel-smelting deoxidizing ball of the invention uses coke powder, fluorite and waterglass compared with traditional deoxidation mode method
It is Raw material processing into the finished product of diameter 15mm-20mm, intensity requirement is in 800N or more, and manufacturing method is easy, manufacturing cost is cheap,
Quickly；It is quantitatively adding deoxidizing ball according to molten steel endpoint carbon content, the carbon dioxide gas that deoxidation process generates not will cause molten steel
Pollution, can be effectively reduced steelmaking process metal loss, reduce the additional amount of light dolomite, improve slag splashing layer
Corrosion resistance to improving steel-making steel quality and reducing steel-making cost, there is important guidance to reduce steel-making cost
Meaning, it is specific as follows：
（1）Steelmaking converter steel slag deoxidizing ball of the invention is deoxidant element using carbonaceous material, and deoxidation products is carbon dioxide gas
Body will not cause the pollution of molten steel and the amount of inclusions to rise, and be conducive to steel quality promotion.
（2）After steelmaking converter steel slag deoxidizing ball use, the oxygen content in steel slag can obviously reduce, iron oxide quilt in part in slag
It is reduced into iron to enter in molten steel, reduces process metal loss, being conducive to steel-making reduces the consumption of iron and steel stock.
（3）After steelmaking converter steel slag deoxidizing ball use, iron oxide content is reduced in slag, and the fusing point and viscosity of steel slag increase,
The corrosion resistance for splashing slag blanket is improved, the control of converter longevity is conducive to.
（4）After steelmaking converter steel slag deoxidizing ball use, as iron oxide content reduces in slag, magnesia saturation degree in slag
With reduction, in the control for splashing slag process and being conducive to magnesia additional amount.
Specific embodiment
For a better understanding of the present invention, below by taking 50 tons of converters as an example, the present invention is made by specific implementation further
Explanation and illustration.
Embodiment 1
A kind of manufacturing method of steelmaking converter steel slag deoxidizing ball, includes the following steps：
Step（1）The Fluorspar Powder of coke powder and granularity 1-5mm, calcirm-fluoride mass content lower than 70% for choosing granularity 1-3mm is original
Material, the waterglass for choosing aqueous 50% is binder；
Step（2）Using coke powder, Fluorspar Powder and waterglass as raw material, use mass percent for 78: 20 :2 proportion, passes through
Ball press is pressed into the finished product of diameter 15mm, and intensity is in 800N, by stand-by after spontaneously drying.
Deoxidizing ball is packed into specified feed bin by charging belt, requires 5% or less chip index after reaching feed bin；Slag produced from steel-smelting
Opportunity selection is added in deoxidizing ball：When converter smelting terminates to mention rifle, endpoint carbon content according to expectation, passing through blanking Weighing system will
Deoxidizing ball prepares in place, and in the addition of falling stokehold.According to molten steel terminal at 0.07%, deoxidizing ball 65kg is added in converter,
Furnace takes slag specimen, and iron oxide content 17.8% does not add the 19.5% of deoxidizing ball decreased significantly, and furnace and tapping process fire door have no
Overflow slag；It is reduced additionally, due to iron oxide content in slag, by diffusive deoxidation, the part oxygen in steel enters in slag, and alloy is received
Yield plays the role of promotion；Lower dolomite additional amount 15kg splashing slag process, and for splash the anti-erosion effect after slag into
Row observation, it is almost the same to splash slag blanket corrosion resistance.
Embodiment 2
A kind of manufacturing method of steelmaking converter steel slag deoxidizing ball, includes the following steps：
Step（1）The Fluorspar Powder of coke powder and granularity 1-5mm, calcirm-fluoride mass content lower than 65% for choosing granularity 1-3mm is original
Material, the waterglass for choosing aqueous 50% is binder；
Step（2）Using coke powder, Fluorspar Powder and waterglass as raw material, use mass percent for 72:25 :3 proportion passes through pressure
Ball machine is pressed into the finished product of diameter 20mm, and intensity is in 850N, by stand-by after spontaneously drying.
Deoxidizing ball is packed into specified feed bin by charging belt, requires 5% or less chip index after reaching feed bin；Slag produced from steel-smelting
Opportunity selection is added in deoxidizing ball：When converter smelting terminates to mention rifle, endpoint carbon content according to expectation, passing through blanking Weighing system will
Deoxidizing ball prepares in place, and in the addition of falling stokehold.Molten steel terminal deoxidizing ball 55kg is added in converter, furnace takes at 0.08%
Slag specimen, iron oxide content 17.3% do not add the 19.3% of deoxidizing ball decreased significantly；It is dropped additionally, due to iron oxide content in slag
Low, by diffusive deoxidation, the part oxygen in steel enters in slag, plays the role of promotion for yield of alloy；Splashing slag process
Dolomite additional amount 15kg is lowered, and is observed for splashing the anti-erosion effect after slag, slag blanket corrosion resistance basic one is splashed
It causes.
Embodiment 3
（1）The production of slag produced from steel-smelting deoxidizing ball
It using coke powder, Fluorspar Powder and binder as raw material, is matched according to certain mass, when fluorite, which is sampled, to be declined, fluorite proportion is suitable
Work as up-regulation.It is mixed using mixing equipment, the finished product of diameter 18mm is pressed by ball press, it is stand-by after natural drying.
（2）Opportunity selection is added in slag produced from steel-smelting deoxidizing ball
When converter smelting terminates to mention rifle, endpoint carbon content according to expectation is prepared deoxidizing ball in place by blanking Weighing system,
And in the addition of falling stokehold.
（3）The additional amount of slag produced from steel-smelting deoxidizing ball selects, and is added according to shown in table 1, when additional amount mentions rifle according to converter
Anticipation carbon is selected, and iron oxide content is substantially reduced in steel slag after addition, since iron oxide reduction bring bits are molten in slag
Point rising, the decline of magnesia saturation degree and other effects gradually show；In addition after the oxygen content in steel reduces, the recovery rate of alloy will have
It is promoted.
1. 50 tons of converter terminal carbon of table and steel slag deoxidizing ball additional amount relation table
Claims (5)
1. a kind of manufacturing method of steelmaking converter steel slag deoxidizing ball, it is characterised in that：Include the following steps：
Step（1）It is original that the coke powder and granularity 1-5mm, Calcium Fluoride Content for choosing granularity 1-3mm, which are lower than 75% Fluorspar Powder below,
Material, the waterglass for choosing aqueous 50% is binder；
Step（2）Using coke powder, Fluorspar Powder and waterglass as raw material, use mass percent for 70-80: 20-30 :2-3's
Proportion is pressed into the finished product of diameter 15mm-20mm by ball press, and intensity is in 800N or more, by stand-by after spontaneously drying.
2. a kind of manufacturing method of steelmaking converter steel slag deoxidizing ball according to claim 1, it is characterised in that：Step（1）
Described in coke powder be ironmaking coke screenings process gained.
3. a kind of application method of steelmaking converter steel slag deoxidizing ball as claimed in claim 1 or 2, it is characterised in that：Including with
Lower step：
Step（1）Deoxidizing ball is packed into specified feed bin by charging belt, requires 5% or less chip index after reaching feed bin；
Step（2）It after converter smelting, is prejudged by terminal, will be taken off according to molten steel endpoint carbon content according to 0.6-1.4kg/t
Oxygen ball is added in converter.
4. a kind of application method of steelmaking converter steel slag deoxidizing ball according to claim 3, it is characterised in that：Step（2）
In, the additional amount 0.6kg/t-1.4kg/t of the deoxidizing ball, the carbon content corresponding to 0.06% or more molten steel terminal.
5. a kind of application method of steelmaking converter steel slag deoxidizing ball according to claim 4, it is characterised in that：Step（2）
In, the additional amount of the deoxidizing ball is in terms of the carbon mass percentage of molten steel terminal：0.07%, deoxidizing ball additional amount 1.0-kg/t-
1.4kg/t, 0.08-0.09%, deoxidizing ball additional amount 0.8kg/t-1.0kg/t ,≤0.10%, deoxidizing ball additional amount 0.6kg/t-
0.8kg/t。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810623131.3A CN108842035A (en) | 2018-06-15 | 2018-06-15 | A kind of manufacturing method of steelmaking converter steel slag deoxidizing ball |
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| CN201810623131.3A CN108842035A (en) | 2018-06-15 | 2018-06-15 | A kind of manufacturing method of steelmaking converter steel slag deoxidizing ball |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413458A (en) * | 2020-04-27 | 2020-07-14 | 广东韶钢松山股份有限公司 | Method for detecting nitrogen content in steelmaking auxiliary material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3802866A (en) * | 1971-03-01 | 1974-04-09 | Voest Ag | Process for producing steels according to the oxygen top-blowing method |
| CN1107180A (en) * | 1994-02-18 | 1995-08-23 | 彭荣富 | Slag foam eliminating agent |
| CN1121114A (en) * | 1994-10-20 | 1996-04-24 | 刘德生 | Slag covering agent for oxygen top-blown convertor and its production method |
| CN101638706A (en) * | 2009-08-25 | 2010-02-03 | 承德新新钒钛股份有限公司 | Liquid steel pre-deoxidizing technology in steelmaking revolving furnace |
| CN102994688A (en) * | 2011-09-16 | 2013-03-27 | 王虎 | Pretreatment technology of terminal steel slag in converter |
-
2018
- 2018-06-15 CN CN201810623131.3A patent/CN108842035A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3802866A (en) * | 1971-03-01 | 1974-04-09 | Voest Ag | Process for producing steels according to the oxygen top-blowing method |
| CN1107180A (en) * | 1994-02-18 | 1995-08-23 | 彭荣富 | Slag foam eliminating agent |
| CN1121114A (en) * | 1994-10-20 | 1996-04-24 | 刘德生 | Slag covering agent for oxygen top-blown convertor and its production method |
| CN101638706A (en) * | 2009-08-25 | 2010-02-03 | 承德新新钒钛股份有限公司 | Liquid steel pre-deoxidizing technology in steelmaking revolving furnace |
| CN102994688A (en) * | 2011-09-16 | 2013-03-27 | 王虎 | Pretreatment technology of terminal steel slag in converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413458A (en) * | 2020-04-27 | 2020-07-14 | 广东韶钢松山股份有限公司 | Method for detecting nitrogen content in steelmaking auxiliary material |
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Application publication date: 20181120 |