CN110468255A - A kind of free-floride KR desulfurizing agent and its preparation, application method - Google Patents
A kind of free-floride KR desulfurizing agent and its preparation, application method Download PDFInfo
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- CN110468255A CN110468255A CN201910845477.2A CN201910845477A CN110468255A CN 110468255 A CN110468255 A CN 110468255A CN 201910845477 A CN201910845477 A CN 201910845477A CN 110468255 A CN110468255 A CN 110468255A
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- desulfurizing agent
- bauxite
- quick lime
- raw material
- floride
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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
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to a kind of free-floride KR desulfurizing agent and its preparations, application method, the desulfurizing agent is mixed by 88%~91% quick lime and 9%~12% bauxite by weight percentage, the chemical composition comprises the following components in percentage by weight of finished product desulfurizing agent, CaO >=75%, Al2O3>=5%.The preparation method of desulfurizing agent includes: the pretreatment of 1) raw material；2) raw material is broken；3) mixing of raw material；By high-speed stirred after finished product desulfurizing agent addition hot-metal bottle when use, rotating speed of agitator control is at 90~120 revs/min, and mixing time is 7~9 minutes, and molten iron carries out taking off slag operation after stirring.The present invention makees fluxing agent using bauxite substitution fluorite and prepares desulfurizing agent, and the desulfurizing agent is not fluorine-containing, to more environment-friendly.
Description
Technical field
The present invention relates to technical field of desulfurizer preparation more particularly to a kind of free-floride KR desulfurizing agent and its preparations, user
Method.
Background technique
Currently, both at home and abroad the desulfurizing agent that generally uses all be with quick lime and fluorite be mixed in a certain ratio made of (such as
Disclosed in Chinese patent application No. is 201710028508.6 " a kind of RH furnace desulfurizing agent), since firefly is added in desulfurizing agent
Stone, and the main component of fluorite is CaF2, so containing fluorine ion in desulfurizing agent.After this desulfurizing agent comes into operation, after desulfurization
Desulfurization slag need by water process, fluorine ion can be transferred in water, to seriously pollute environment, be detrimental to health.So
There is an urgent need to find a kind of substance that can substitute fluorite, prepare a kind of to more environment-friendly desulfurizing agent.
Summary of the invention
The present invention provides a kind of free-floride KR desulfurizing agent and its preparations, application method, replace fluorite to help using bauxite
Flux prepares desulfurizing agent, and the desulfurizing agent is not fluorine-containing, to more environment-friendly.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
The desulfurizing agent mixes system by 88%~91% quick lime and 9%~12% bauxite by weight percentage
At, the chemical composition comprises the following components in percentage by weight of finished product desulfurizing agent, CaO >=75%, Al2O3>=5%.
The chemical component and its weight percent content of the quick lime are as follows: CaO >=85%, SiO2≤ 2.0%, S≤
0.030%, surplus is impurity；Quick lime activity degree >=300ml.
The chemical component and its weight percent content of the bauxite are as follows: TiO2≤ 5.0%, Fe2O3≤ 3.0%, MgO+
CaO≤0.5%, Al2O370%~75%, K2O+Na2O≤0.5%, surplus are water and impurity.
A kind of preparation method of free-floride KR desulfurizing agent, includes the following steps:
1) pretreatment of raw material；
After screening, the quick lime of 13mm or less granularity inputs corresponding low level feed bin to raw material quick lime；Bauxite raw material
It is crushed crusher machine, the bauxite of 10mm or less granularity inputs corresponding low level feed bin；
2) raw material is broken；
Quick lime and bauxite in low level feed bin are crushed to 3mm or less granularity through crusher respectively；
3) mixing of raw material；
Quick lime, bauxite are given respectively by promotion bunker lift to corresponding high-order surge bunker using corresponding rotation
Material machine enters in same blender through spiral weighing balance to be mixed, and is entered finished bin after mixing and is stored.
A kind of application method of free-floride KR desulfurizing agent, by high-speed stirred after finished product desulfurizing agent addition hot-metal bottle, agitating paddle turns
Speed control is at 90~120 revs/min, and mixing time is 7~9 minutes, and molten iron carries out taking off slag operation after stirring.
Compared with prior art, the beneficial effects of the present invention are:
1) present invention replaces fluorite to make fluxing agent and prepares desulfurizing agent, solve because of desulfurizing agent fluoride ion using bauxite,
In water after making to handle desulfurization slag the problem of content of fluoride ion exceeded pollution environment, to more environment-friendly；
2) bauxite can reduce the fusing point of desulfurization slag as fluxing agent, reduce the melting temperature of desulfurization slag, to mention
The sulfur capacity of high quick lime, and desulfuration efficiency is improved, desulfuration efficiency can reach 94% or more；
3) compared with conventional desulfurizing agent, desulfurizing agent cost can be made at least to reduce by 133 yuan/ton, and caused by reducing because of desulfurizing agent
Hot-metal bottle and the resistance to material of agitating paddle corrode, extend service life of equipment.
Specific embodiment
A kind of free-floride KR desulfurizing agent of the present invention, the desulfurizing agent by weight percentage by 90%~92% life stone
Grey and 8%~10% bauxite is mixed.
The desulfurizing agent mixes system by 88%~91% quick lime and 9%~12% bauxite by weight percentage
At, the chemical composition comprises the following components in percentage by weight of finished product desulfurizing agent, CaO >=75%, Al2O3>=5%.
The chemical component and its weight percent content of the quick lime are as follows: CaO >=85%, SiO2≤ 2.0%, S≤
0.030%, surplus is impurity；Quick lime activity degree >=300ml.
The chemical component and its weight percent content of the bauxite are as follows: TiO2≤ 5.0%, Fe2O3≤ 3.0%, MgO+
CaO≤0.5%, Al2O370%~75%, K2O+Na2O≤0.5%, surplus are water and impurity.
A kind of preparation method of free-floride KR desulfurizing agent, includes the following steps:
1) pretreatment of raw material；
After screening, the quick lime of 13mm or less granularity inputs corresponding low level feed bin to raw material quick lime；Bauxite raw material
It is crushed crusher machine, the bauxite of 10mm or less granularity inputs corresponding low level feed bin；
2) raw material is broken；
Quick lime and bauxite in low level feed bin are crushed to 3mm or less granularity through crusher respectively；
3) mixing of raw material；
Quick lime, bauxite are given respectively by promotion bunker lift to corresponding high-order surge bunker using corresponding rotation
Material machine enters in same blender through spiral weighing balance to be mixed, and is entered finished bin after mixing and is stored.
A kind of application method of free-floride KR desulfurizing agent, which is characterized in that by high-speed stirring after finished product desulfurizing agent addition hot-metal bottle
It mixes, rotating speed of agitator control is at 90~120 revs/min, and mixing time is 7~9 minutes, and molten iron carries out taking off slag operation after stirring.
The chemical equation of KR method desulfurizing iron key reaction is: [S]+(CaO)=(CaS)+[O], into molten iron O and
Si reaction in molten iron generates SiO2, SiO2Dystectic dicalcium silicate is generated with quick lime reaction, dicalcium silicate viscosity height makes
Quick lime is reunited, and quick lime becomes the spherical substance of granularity 6mm or more, make the spherical substance of quick lime lose in molten iron
The chance of sulphur contact, causes desulfurization degree to decline.The generation of above-mentioned phenomenon in order to prevent, it is common practice to which fluorite, which is added, makes silicic acid
The fusing point of dicalcium slag system reduces, and desulphurization reaction is made to continue to carry out to the inside of the quick lime ball dress substance reunited, so as to improve
Desulfuration efficiency.
The present invention changes the method for reducing fusing point with fluorite slag system, and desulfurizing agent is using the quick lime of high activity degree and natural
The quick lime surface area of mineral bauxite, high activity degree increases, and desulphurizing ability is stronger, is equipped with natural minerals bauxite, bauxite
In the Al that contains2O3, in natural bauxite containing 40% active Al2O3, active Al2O3It is raw stone with natural hole
The carrier of grey desulfurization has very strong catalytic action, while the Al of low content2O3It can reduce the fusing point of calcium aluminate slag system, promote
The desulphurization reaction of quick lime.The chance of quick lime Yu molten iron sulphur is increased in conjunction with KR mechanical agitation, to effectively mention
High desulfuration efficiency.By the lithofacies analysis to desulfurization slag, desulfurization product CaS is mainly distributed in aluminum calcium salt, can be proved
Above-mentioned theory.
Following embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
Not mentionleting alone bright is conventional method.
[embodiment]
The present embodiment includes the component proportion (by weight percentage) of each group desulfurizing agent such as 1 institute of table in 5 groups of specific examples
Show:
Table 1
| Serial number | Quick lime (%) | Bauxite (%) |
| 1 | 88 | 12 |
| 2 | 90.1 | 9.9 |
| 3 | 90.5 | 9.5 |
| 4 | 90.7 | 9.3 |
| 5 | 90.9 | 9.1 |
The chemical component and its weight percent content of the quick lime are as shown in table 2:
Table 2
| Serial number | CaO (%) | SiO2(%) | S (%) | Activity degree/ml |
| 1 | 85.3 | 1.83 | 0.021 | 300 |
| 2 | 85.7 | 1.90 | 0.018 | 311 |
| 3 | 86.1 | 1.88 | 0.023 | 393 |
| 4 | 85.4 | 1.79 | 0.019 | 343 |
| 5 | 85.8 | 1.85 | 0.024 | 323 |
The chemical component and its weight percent content of the bauxite are as shown in table 3:
Table 3
| Serial number | Al2O3(%) | SiO2(%) | MgO (%) | TiO2(%) |
| 1 | 70.2 | 17.88 | 0.3 | 2.8 |
| 2 | 70.2 | 17.88 | 0.3 | 2.8 |
| 3 | 70.2 | 17.88 | 0.3 | 2.8 |
| 4 | 70.2 | 17.88 | 0.3 | 2.8 |
| 5 | 70.2 | 17.88 | 0.3 | 2.8 |
The result of laboratory test of finished product desulfurizing agent is as follows:
| Serial number | CaO (%) | SiO2(%) | Al2O3(%) | TiO2(%) |
| 1 | 70.2 | 2.38 | 6.03 | 0.29 |
| 2 | 70.1 | 2.81 | 5.53 | 0.29 |
| 3 | 65.27 | 2.01 | 4.28 | 0.27 |
| 4 | 60.37 | 2.09 | 5.67 | 0.27 |
| 5 | 59.53 | 2.89 | 6.96 | 0.28 |
In the present embodiment, the preparation process of the desulfurizing agent is as follows:
1, the pretreatment of raw material；
Carry out quick lime from the drawing of fire resisting factory automotive and is discharged to converter low level feed bin, starting sieve glassware when quick lime in converter,
For quick lime raw material through sieving glassware screening, undersize degree is the 13mm raw material below that can be used as desulfurizing agent, will meet granularity and wants
The quick lime asked is transported to tank car in the quick lime low level feed bin at desulfurizing agent preparation scene.
The bauxite (granularity is 20-40mm) of outsourcing is crushed to granularity 10mm hereinafter, transporting to desulfurization by jaw crusher
In the bauxite low level feed bin at agent preparation scene.
2, raw material is broken；
The bauxite in quick lime, bauxite low level feed bin in quick lime low level feed bin is respectively by corresponding vertical broken
Broken crusher machine is to 3mm granularity below.
3, the mixing of raw material；
Broken quick lime and bauxite pass through respectively promotes bunker lift into corresponding high-order surge bunker, using
Corresponding rotary feeder, spiral weighing balance enter mixing in same biaxial rneader, and desulfurizing agent has been prepared after mixing
At into finished bin storage.
The proportion that quick lime and bauxite are controlled by controlling the stream that rotary metering claims, it is raw by taking the 3rd group of desulfurizing agent as an example
The mixed proportion of lime and bauxite is 90.5%:9.5%, then the stream of quick lime is 16 ton/hours, the stream control of bauxite
System is at 1.4 ton/hours.
The chemical examination ingredient (weight percent) of finished product desulfurizing agent: CaO 59%, Al2O35%, the activity degree of raw material quick lime
For 320ml.
Compliance test result:
1, desulfuration efficiency；
The data of 100 tanks normal desulfurizing agent and of the present invention desulfurizing agent are used scene respectively under the conditions of same operating
It is counted, the result is as follows:
| Desulfurizing agent | Use tank number | Average de- preceding sulphur (%) | Average de- rear sulphur (%) | Desulfuration efficiency (%) | Kg/ tons of iron of sorbent consumption |
| It is conventional | 100 | 0.021 | 0.0026 | 87.6 | 7.2 |
| The present invention | 100 | 0.022 | 0.0019 | 91.4 | 7.1 |
The desulfuration efficiency of desulfurizing agent of the present invention and pulvis consumption are better than conventional desulfurizing agent as can be seen from the above table.
2, desulfurization slag ingredient；
Desulfurization slag ingredient
| CaO% | SiO2% | Al2O3% | MgO% | CaF2% | FeO% | |
| It is conventional | 61.63 | 21.8 | 1.03 | 1.5 | 4.52 | 5.95 |
| The present invention | 60.25 | 20.3 | 4.32 | 1.4 | 0 | 4.83 |
Raw material in desulfurizing agent of the present invention is not used fluorine-containing material and does not also change in desulfurization slag as can be seen from the above table
Test out fluorine ion.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of free-floride KR desulfurizing agent, which is characterized in that the desulfurizing agent by weight percentage by 88%~91% life stone
Grey and 9%~12% bauxite is mixed, the chemical composition comprises the following components in percentage by weight of finished product desulfurizing agent, CaO >=75%,
Al2O3>=5%.
2. a kind of free-floride KR desulfurizing agent according to claim 1, which is characterized in that the chemical component of the quick lime and its
Weight percent content are as follows: CaO >=85%, SiO2≤ 2.0%, S≤0.030%, surplus are impurity；Quick lime activity degree >=
300ml。
3. a kind of free-floride KR desulfurizing agent according to claim 1, which is characterized in that the chemical component of the bauxite and its
Weight percent content are as follows: TiO2≤ 5.0%, Fe2O3≤ 3.0%, MgO+CaO≤0.5%, Al2O370%~75%, K2O+
Na2O≤0.5%, surplus are water and impurity.
4. the preparation method of any one free-floride KR desulfurizing agent according to claims 1 to 3, which is characterized in that including such as
Lower step:
1) pretreatment of raw material；
After screening, the quick lime of 13mm or less granularity inputs corresponding low level feed bin to raw material quick lime；Bauxite raw material is through broken
The bauxite of broken crusher machine, 10mm or less granularity inputs corresponding low level feed bin；
2) raw material is broken；
Quick lime and bauxite in low level feed bin are crushed to 3mm or less granularity through crusher respectively；
3) mixing of raw material；
Quick lime, bauxite are respectively by promotion bunker lift to corresponding high-order surge bunker, using corresponding rotary feeder
Enter in same blender through spiral weighing balance and mix, enters finished bin after mixing and store.
5. the application method of any one free-floride KR desulfurizing agent as described in claims 1 to 3, which is characterized in that will be at pint
High-speed stirred after hot-metal bottle is added in sulphur agent, and rotating speed of agitator control is at 90~120 revs/min, and mixing time is 7~9 minutes, stirring
Molten iron carries out taking off slag operation afterwards.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736131A (en) * | 2009-12-31 | 2010-06-16 | 辽宁天和矿产有限公司 | Pre-melted desulfurizing agent for refining molten steel and preparation method thereof |
| CN102051443A (en) * | 2010-12-31 | 2011-05-11 | 昆明理工大学 | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer |
| CN104032095A (en) * | 2014-06-19 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel dephosphorizing agent and method for dephosphorizing molten steel |
| CN108396092A (en) * | 2018-03-26 | 2018-08-14 | 首臣（上海）新能源科技有限公司 | A kind of method of free-floride KR desulfurizing agents, manufacturing method and desulfurization |
-
2019
- 2019-09-06 CN CN201910845477.2A patent/CN110468255A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736131A (en) * | 2009-12-31 | 2010-06-16 | 辽宁天和矿产有限公司 | Pre-melted desulfurizing agent for refining molten steel and preparation method thereof |
| CN102051443A (en) * | 2010-12-31 | 2011-05-11 | 昆明理工大学 | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer |
| CN104032095A (en) * | 2014-06-19 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel dephosphorizing agent and method for dephosphorizing molten steel |
| CN108396092A (en) * | 2018-03-26 | 2018-08-14 | 首臣（上海）新能源科技有限公司 | A kind of method of free-floride KR desulfurizing agents, manufacturing method and desulfurization |
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