CN109338044A - Pre-melted refining slag and preparation method thereof - Google Patents
Pre-melted refining slag and preparation method thereof Download PDFInfo
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- CN109338044A CN109338044A CN201811550762.3A CN201811550762A CN109338044A CN 109338044 A CN109338044 A CN 109338044A CN 201811550762 A CN201811550762 A CN 201811550762A CN 109338044 A CN109338044 A CN 109338044A
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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
- C21C7/076—Use of slags or fluxes as treating agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention belongs to metallurgical technology fields, and in particular to pre-melted refining slag and preparation method thereof.Present invention solves the technical problem that be existing pre-melted refining slag preparation cost it is higher.The invention discloses the preparation methods of pre-melted refining slag, include the following steps: a, electric furnace is added in the silicon ferrovanadium slag of molten condition after smelting, form molten bath；B, at least one of active lime or lime stone are added into molten bath to smelt, and use stirring of inert gas molten bath, formed containing 12CaO7Al2O3The slag of phase；C, the slag and molten metal in molten bath are separated, obtains pre-melted refining slag for being crushed after slag cooling.The pre-melted refining slag finished product that the method for the present invention is prepared can achieve 750~840 yuan/ton of benefit, save cost, and meet technique requirement.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to pre-melted refining slag and preparation method thereof.
Background technique
Pre-melted refining slag is to use slugging furnace to be prepared according to a certain percentage the raw material for forming pre-melted refining slag.
Converter current steel-making refining process generallys use furnace outer refining technology, steel-making effect can be made to reach most using pre-melted refining slag
It is good, but influenced by production technology and cost of material, higher operating costs, it is existing prepare pre-melted refining slag using vanadine,
Lime stone (or active lime) melts in electric furnace or rotary kiln to be made, and keeps raw material energy consumption relatively high.
It is that product content of vanadium is lower that the production method of vanadium iron, which mainly has the shortcomings that ferrosilicon process and aluminothermic process, ferrosilicon process,
It cannot be used for the production very high vanadium iron of content of vanadium, but its great advantage is that production cost is low.The production of existing silicon vanadium iron
Joined aluminum shot in the process, ferrosilicon is restored, while slag making is carried out with lime stone, containing higher in obtained smelted furnace cinder
A2O3, the ingredients such as CaO and MgO, lead to the main processing ways of smelted furnace cinder for landfill or stack, be easy to cause environmental pollution.Smelting
The resource utilization of furnace slag is of great significance for mitigating the sustainable development of carrying capacity of environment and metallurgical industry.
Summary of the invention
The technical problem to be solved by the present invention is to the preparation cost of existing pre-melted refining slag is higher.
The present invention is to solve its technical problem the technical solution adopted is that providing a kind of pre-melted refining slag and its preparation
Method.
The preparation method of pre-melted refining slag provided by the invention includes the following steps: a, by the silicon of molten condition after smelting
Electric furnace is added in ferrovanadium slag, forms molten bath；B, at least one of active lime or lime stone are added into molten bath, is used in combination
Stirring of inert gas molten bath forms and contains 12CaO7Al2O3The slag of phase；C, the slag and molten metal in molten bath are separated, after slag cooling
It is broken to obtain pre-melted refining slag.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, the silicon ferrovanadium slag is to be smelted using ferrosilicon process
The clinker generated when vanadium iron.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, the silicon ferrovanadium slag is wrapped by weight percentage
It includes: CaO18~22%, Al2O345~55% and MgO 17~21%.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, in step b, when active lime is added, the silicon vanadium iron
The mass ratio of smelted furnace cinder and active lime is 1~2.3:1；When lime stone is added, the silicon ferrovanadium slag and activity
The mass ratio of lime is 0.71~1.75:1；When simultaneously active lime and lime stone is added when, the silicon ferrovanadium slag with
The mass ratio of active lime and limestone mix material are as follows: 0.83~2.3:1；The mass ratio of the active lime and lime stone is
1:1~3.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, in step b, the matter of CaO in the active lime of the addition
It measures percentage composition and is greater than 85%.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, in step b, the inert gas is nitrogen or argon gas.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, in step b, the temperature of the smelting is 1450~1550
DEG C, the time of smelting is 5~30min.
The present invention also provides pre-melted refining slags prepared by the above method.
Wherein, in above-mentioned pre-melted refining slag, the ingredient of the pre-melted refining slag by weight hundred includes: than meter
22.5%~38.5% Al2O3, 43.5%~64.5% CaO, 8.5%~14.7% MgO, the SiO lower than 0.5%2、
S lower than the 0.05% and P lower than 0.05%.
Wherein, in above-mentioned pre-melted refining slag, the granularity of the pre-melted refining slag is 10~50mm.
Wherein, in above-mentioned pre-melted refining slag, the pre-melted refining slag is steel-making pre-melted refining slag.
The beneficial effects of the present invention are:
The raw material that the method for the present invention prepares pre-melted refining slag do not need be added alumina, can reduce alumina dosage 50~
60%, and energy consumption is made to reduce by 50%, the pre-melted refining slag finished product being prepared can achieve 750~840 yuan/ton of effect
Benefit.The silicon ferrovanadium slag of molten condition after smelting is added in another electric furnace and carries out at recycling to clinker by the method for the present invention
Reason, optimizes pre-melted refining slag ingredient using the two-link smelting process smelted after first vanadium extraction, without considering that vanadium is received
The influence of rate.The method of the present invention can efficiently use silicon ferrovanadium slag, realize the resource utilization of clinker, reduce ring
Border pollution.The pre-melted refining slag that the method for the present invention is prepared meets technique requirement.
Specific embodiment
Specifically, including the following steps: a the invention discloses the preparation method of pre-melted refining slag, being melted after smelting
Electric furnace is added in the silicon ferrovanadium slag of state, forms molten bath；B, it is added in active lime or lime stone at least into molten bath
One kind, and with stirring of inert gas molten bath, it is formed and contains 12CaO7Al2O3The slag of phase；C, the slag and molten metal in molten bath are separated,
Pre-melted refining slag is obtained by being crushed after slag cooling.
In the present invention, the silicon ferrovanadium slag of molten condition after smelting is added in another electric furnace and clinker is provided
Sourceization processing, optimizes pre-melted refining slag ingredient using the two-link smelting process smelted after first vanadium extraction, and does not have to examine
Consider the influence of vanadium recovery rate；Molten bath is formed using the waste heat of clinker simultaneously, molten bath can be formed by not needing to be powered in step a,
Cost is saved.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, the silicon ferrovanadium slag is to be smelted using ferrosilicon process
The clinker generated when vanadium iron.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, the silicon ferrovanadium slag is wrapped by weight percentage
It includes: CaO18~22%, Al2O345~55% and MgO 17~21%.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, in step b, when active lime is added, the silicon vanadium iron
The mass ratio of smelted furnace cinder and active lime is 1~2.3:1；When lime stone is added, the silicon ferrovanadium slag and activity
The mass ratio of lime is 0.71~1.75:1；When simultaneously active lime and lime stone is added when, the silicon ferrovanadium slag with
The mass ratio of active lime and limestone mix material are as follows: 0.83~2.3:1；The mass ratio of the active lime and lime stone is
1:1~3.
In the present invention, active lime, lime stone are added in silicon ferrovanadium slag in batches.Be conducive to make to be added molten
Lime or lime stone in pond melt in time, improve reacting between slag phase and metal liquid phase, can also promote needed for refining slag
The formation of substance improves the quality of pre-melted refining slag.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, in step b, the matter of CaO in the active lime of the addition
It measures percentage composition and is greater than 85%.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, in step b, the inert gas is nitrogen or argon gas.It adopts
It can promote heat transfer and mass transfer with stirring of inert gas, may advantageously facilitate containing 12CaO7Al2O3The generation of the slag of phase.
Wherein, in the preparation method of above-mentioned pre-melted refining slag, in step b, the temperature of the smelting is 1450~1550
DEG C, the time of smelting is 5~30min.
The present invention also provides pre-melted refining slags prepared by the above method.
Wherein, in above-mentioned pre-melted refining slag, the ingredient of the pre-melted refining slag includes: by weight percentage
22.5%~38.5% Al2O3, 43.5%~64.5% CaO, 8.5%~14.7% MgO, the SiO lower than 0.5%2、
S lower than the 0.05% and P lower than 0.05%.The pre-melted refining slag that the method for the present invention is prepared meets production requirement.
Wherein, in above-mentioned pre-melted refining slag, the granularity of the pre-melted refining slag is 10~50mm.
Wherein, in above-mentioned pre-melted refining slag, the pre-melted refining slag is steel-making pre-melted refining slag.
The present invention will further be elaborated by specific embodiment below.
Embodiment 1
In the present embodiment, silicon ferrovanadium slag includes: CaO20.14%, Al by weight percentage2O348.65%,
MgO 18.01% and SiO20.64%.The mass percentage of CaO is 85.98% in active lime.Silicon ferrovanadium slag with
Active lime is 65:35 in mass ratio, amounts to 5.2t.
Silicon ferrovanadium slag under molten condition is directly added into electric arc furnaces, point 3 batches of addition active limes after energization, often
The amount of secondary addition is respectively 15%, 10% and the 10% of total material weight, and total additional amount of active lime is 35%, and is stirred with nitrogen
Mix and smelt 13min at 1455 DEG C, smelt after the completion of separation molten bath in slag and molten metal, by slag it is cold be poured into slag pan it is naturally cold
But, pre-melted refining slag is crushed to by 40mm or less using jaw crusher after cooling and obtains pre-melted refining slag finished product.
The pre-melted refining slag that the present embodiment is prepared include: by weight percentage CaO45.37%,
Al2O332.02%, MgO10.96%, SiO20.49%, S0.031% and P0.014%.
Embodiment 2
In the present embodiment, silicon ferrovanadium slag includes: CaO19.04%, Al by weight percentage2O352.34%,
MgO 18.25% and SiO20.59%.Silicon ferrovanadium slag and lime stone are 55:45 in mass ratio, amount to 5.5t.
Silicon ferrovanadium slag under molten condition is directly added into electric arc furnaces, point 3 batches of addition lime stones after energization, every time
The amount of addition is respectively 25%, 10% and the 10% of total material weight, and total additional amount of active lime is 45%, and uses nitrogen gas stirring
Smelt 21min at 1550 DEG C, the slag and molten metal after the completion of smelting in separation molten bath, by slag it is cold be poured into slag pan it is naturally cold
But, pre-melted refining slag is crushed to by 40mm or less using jaw crusher after cooling and obtains pre-melted refining slag finished product.
The pre-melted refining slag that the present embodiment is prepared include: by weight percentage CaO49.65%,
Al2O329.64%, MgO9.87%, SiO20.47%, S0.025% and P0.010%.
Embodiment 3
In the present embodiment, silicon ferrovanadium slag includes: CaO21.24%, Al by weight percentage2O354.34%,
MgO 19.25% and SiO20.48%.Silicon ferrovanadium slag, lime and lime stone are 60:20:20 in mass ratio, are amounted to
5.6t。
Silicon ferrovanadium slag under molten condition is directly added into electric arc furnaces, point 3 batches of addition lime stones and work after energization
Property lime mixture, the weight ratio of lime stone and active lime is 1:1 in mixture, and the amount being added every time is respectively total material
Total additional amount of 20%, 10% and the 10% of weight, lime stone and active lime is 40%, and with nitrogen gas stirring smelting at 1480 DEG C
18min is refined, the slag and molten metal after the completion of smelting in separation molten bath are poured into natural cooling in slag pan for slag is cold, use after cooling
Pre-melted refining slag is crushed to 40mm or less and obtains pre-melted refining slag finished product by jaw crusher.
The pre-melted refining slag that the present embodiment is prepared include: by weight percentage CaO48.01%,
Al2O332.61%, MgO11.96%, SiO20.48%, S0.017% and P0.009%.
By Examples 1 to 3 it is found that the pre-melted refining slag that the method for the present invention is prepared meets technique requirement.
The raw material that the method for the present invention prepares pre-melted refining slag do not need be added alumina, can reduce alumina dosage 50~
60%, and energy consumption is made to reduce by 50%, the pre-melted refining slag finished product being prepared can achieve 750~840 yuan/ton of effect
Benefit.The method of the present invention can efficiently use silicon ferrovanadium slag, realize the resource utilization of clinker, reduce environment dirt
Dye.
Claims (10)
1. the preparation method of pre-melted refining slag, it is characterised in that include the following steps:
A, electric furnace is added in the silicon ferrovanadium slag of molten condition after smelting, forms molten bath；
B, into molten bath be added at least one of active lime or lime stone smelt, and use stirring of inert gas molten bath, formation
Containing 12CaO7Al2O3The slag of phase；
C, the slag and molten metal in molten bath are separated, obtains pre-melted refining slag for being crushed after slag cooling.
2. the preparation method of pre-melted refining slag according to claim 1, it is characterised in that: the silicon ferrovanadium slag
The clinker generated when for using ferrosilicon process smelting ferrovanadium alloy.
3. the preparation method of pre-melted refining slag according to claim 1 or 2, it is characterised in that: the silicon vanadium iron is smelted
Clinker includes: CaO18~22%, Al by weight percentage2O345~55% and MgO 17~21%.
4. the preparation method of described in any item pre-melted refining slags according to claim 1~3, it is characterised in that: in step b,
When active lime is added, the mass ratio of the silicon ferrovanadium slag and active lime is 1~2.3:1；When addition lime stone
When, the mass ratio of the silicon ferrovanadium slag and active lime is 0.71~1.75:1；Active lime and stone are added when simultaneously
When lime stone, the mass ratio of the silicon ferrovanadium slag and active lime and limestone mix material are as follows: 0.83~2.3:1；Institute
The mass ratio for stating active lime and lime stone is 1:1~3.
5. the preparation method of pre-melted refining slag according to any one of claims 1 to 4, it is characterised in that: in step b,
The mass percentage of CaO is greater than 85% in the active lime of the addition.
6. the preparation method of described in any item pre-melted refining slags according to claim 1~5, it is characterised in that: in step b,
The temperature of the smelting is 1450~1550 DEG C, and the time of smelting is 5~30min.
7. pre-melted refining slag, it is characterised in that: the pre-melted refining slag is described in any item pre- using claim 1~6
The preparation method of molten type refining slag obtains.
8. pre-melted refining slag according to claim 7, it is characterised in that: the ingredient of the pre-melted refining slag is by weight
Hundred than count include: 22.5%~38.5% Al2O3, 43.5%~64.5% CaO, 8.5%~14.7% MgO, be lower than
0.5% SiO2, the S lower than 0.05% and the P lower than 0.05%.
9. pre-melted refining slag according to claim 7 or 8, it is characterised in that: the granularity of the pre-melted refining slag is
10~50mm.
10. according to the described in any item pre-melted refining slags of claim 7~9, it is characterised in that: the pre-melted refining slag is
Pre-melted refining slag is used in steel-making.
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| CN201811550762.3A CN109338044A (en) | 2018-12-18 | 2018-12-18 | Pre-melted refining slag and preparation method thereof |
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| CN201811550762.3A CN109338044A (en) | 2018-12-18 | 2018-12-18 | Pre-melted refining slag and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560131A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
| CN102560006A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
| CN105200192A (en) * | 2015-10-28 | 2015-12-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Liquid steel refining slag and preparation method and application thereof |
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2018
- 2018-12-18 CN CN201811550762.3A patent/CN109338044A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560131A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
| CN102560006A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
| CN105200192A (en) * | 2015-10-28 | 2015-12-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Liquid steel refining slag and preparation method and application thereof |
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Application publication date: 20190215 |