CN106636535A - Convertor steelmaking fluorine-free slag former and preparation method thereof - Google Patents
Convertor steelmaking fluorine-free slag former and preparation method thereof Download PDFInfo
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- CN106636535A CN106636535A CN201611235873.6A CN201611235873A CN106636535A CN 106636535 A CN106636535 A CN 106636535A CN 201611235873 A CN201611235873 A CN 201611235873A CN 106636535 A CN106636535 A CN 106636535A
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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
- 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
- C21C5/36—Processes yielding slags of special composition
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Abstract
The invention provides a convertor steelmaking fluorine-free slag former and a preparation method thereof, and relates to the technical field of converter steelmaking auxiliary materials. The converter steelmaking fluorine-free slag former is prepared from the following raw materials in parts by weight: 35 to 50 parts of steel mill waste residues, 5 to 10 parts of oxidized scale, 10 to 20 parts of alumina powder, 1 to 10 parts of bonding agent and 30 to 40 parts of fluxing agent. The fluorine-free slag former has remarkable desulfuration and dephosphorization functions, the desulfuration rate can be over 90 percent, the dephosphorization effect is below 15ppm, the slag forming time is shortened, and the production efficiency is increased.
Description
Technical field
The present invention relates to pneumatic steelmaking auxiliary material technical field, and in particular to a kind of pneumatic steelmaking floride-free slag former and its system
Preparation Method.
Background technology
At present global problem of environmental pollution is highlighted, and under this big situation, the index request of China's environmental pollution is also got over
Come stricter.Requirement of the steel mill user to sulphur in steel, phosphorus content is also increasingly strict.How to accomplish both environmental protection, and steel-making can be reduced
Cost, moreover it is possible to ensure that sulphur in steel, phosphorus content reduce becoming focus of concern.Converter slag-making is must not in steel-making iron-smelting process
The ring that can lack.Steel-making and the purpose smelted iron are to reduce the impurity in steel, and these impurity enter slag after being separated, because
For slag light specific gravity, swim in above molten steel, be just easier to remove.In addition slag can also protect molten steel discord air direct
Contact.The difference of steel and iron is the difference of impurities amount.Carbon content is not only reduced in steelmaking process, also to be dropped
Low-sulfur, phosphorus equal size, this is accomplished by excluding them in the form of slag by " slag making ".Slag-making fluxing agent can ensure that reduction
The fusing point of slag, mainly changes the fusing point of slag so as to be changed into flux, fluorite can be completely substituted, so as to reduce to furnace lining
Erosion, reduce environmental pollution, and reduce the raw material dosages such as lime, reduce the production cost of steel-making.
In the market generally using fluorite as pneumatic steelmaking slag-making fluxing agent, although achieve good slugging effect,
But Eroded furnace lining, reduces the service life of furnace lining, and increased iron and steel raw material consumption, while causing serious fluorine
Environmental pollution, also results in steel mill and overstocks substantial amounts of steel-making waste residue, and the utilization space for making steel mill is reduced in a large number.
Application No. 201210194179 discloses a kind of floride-free slagging agent, and it is with bauxite as primary raw material, with silicon
Stone, floride-free iron containing compoundses, quick lime are auxiliary material, the content of the effective ingredient of bauxite are controlled in following scope by auxiliary material
It is interior：To account for the percent by weight of floride-free slagging agent, Al2O343~50%、SiO211~13%、Fe2O315 ~ 20% and CaO2 ~ 4%.Should
Invention solves harm of the existing fluorine-containing slagging agent to environment, and when actually used, slag is without clinker, slag flowing, terminal slag
Without anti-dry phenomenon, without the ornamental work of iron, entrainment iron water amount is few in slag during deslagging for deslagging slag stream, compared with conventional fluorine-containing slagging agent, using this
The floride-free slagging agent ton steel consumption iron and steel stock of invention reduces 4 ~ 5kg/t, and more environmentally friendly.Application No. 201210307853.0 it is special
Profit is related to a kind of freon-free slagging agent for rotating furnace and preparation method thereof, and it contains metallic aluminium（Al）, alundum (Al2O3)（Al2O3）, iron and
Its oxide（TFe）, silica（SiO2）, calcium oxide（CaO）, magnesia（MgO）And inevitable other impurity；Its institute
Percentage by weight containing component is respectively：Metallic aluminium 1 ~ 15, alundum (Al2O3) 38 ~ 55, iron and its oxi 8 ~ 22, silica
≤ 20, calcium oxide≤10, magnesia≤4, other materials surplus, slugging when being adapted to pneumatic steelmaking.The invention can significantly change
Kind melt tank reaction dynamic conditions, slugging effect is good, and steel adhesion on oxygen lance, the metal expulsion caused because of slag " returning dry " is solved very well
And de- S, P ability problem of slag；TFe contents in slag are reduced, increases the recovery rate of iron of molten steel, reduce molten steel ton consumption cost；
Lining wear is reduced, slag splashing effect is good；Because not containing F-, environmental protection is benefited, floride-free steel-making is realized, it is suitable for pneumatic steelmaking production
The requirement that process is cleaned.
Because not fluorine-containing, environmental pollution reduces floride-free slag former, is the development trend of current slag former, and above-mentioned technology
Scheme continues to research and develop that performance is higher, preferably free-floride slag former has certain reference significance to effect to us.But
Above-mentioned floride-free slag former there is problems：1）Desulfurization, dephosphorization effect are poor, and desulfurized effect is generally less than 75%, dephosphorization effect
80% is generally less than, existing fluorine-containing slag former effect is compared not notable；2）Lime usage amount is big, and reactivity is low, production cost
It is high；3）Sludging time is longer, affects dephosphorization effect, and in different pneumatic steelmaking tests, property stable in properties is poor.
The content of the invention
In view of this, the technical problem to be solved is to provide a kind of pneumatic steelmaking free-floride slag former, uses
Steel mill discards slag, improves desulfurization, the dephosphorization effect of slag former.
To solve above-mentioned technical problem, the technical solution adopted in the present invention is：
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：35 ~ 50 parts of steel mill's waste residue, oxidation
5 ~ 10 parts of iron sheet, 10 ~ 20 parts of alumina powder, 1 ~ 10 part of binding agent, 30 ~ 40 parts of flux.
Further, the chemical composition and its weight/mass percentage composition of steel mill's waste residue is：Silica 10 ~ 20%, oxidation
Calcium 35 ~ 45%, alundum (Al2O3) 15 ~ 25%, di-iron trioxide 12 ~ 18%, magnesia 4 ~ 8%, balance of inevitably micro unit
Element.
Further, the particle diameter of the alumina powder is 200 ~ 300 mesh.
Further, the binding agent is one or more in bentonite, phenolic resin, hydroxymethyl cellulose
Composition.
Further, the flux is sodium bicarbonate.
Further, the chemical composition and its weight percentage of the pneumatic steelmaking free-floride slag former is：Titanium dioxide
Silicon 5 ~ 15%, di-iron trioxide 10 ~ 20%, calcium oxide 12 ~ 25%, sodium oxide molybdena 18 ~ 30%, magnesia 1 ~ 8%, alundum (Al2O3) 10 ~
18%, balance of inevitable trace element.
A kind of pneumatic steelmaking preparation method of floride-free slag former, comprises the following steps：
Step S1：Steel mill's waste residue, iron scale, alumina powder and flux are weighed respectively, and batching is crushed, crossed more than 100 mesh
Screen cloth, sends into batch mixer and mixes 10 ~ 15 minutes；
Weigh binding agent, it is and described in adding the batch mixer after adding the water stirring mixing of 5 ~ 10 times of the weight of binder
Steel mill's waste residue, iron scale, alumina powder and flux are again stirring for together 20 ~ 30 minutes, obtain batch mixing；
Step S2：The batch mixing is sent into ball press, balling-up is rolled under 30 ~ 40kN of pressure, particle diameter is obtained to less than 50 millimeters
Slag ball；
Step S3：The slag ball is placed in into calcination processing in Muffle furnace, to moisture 0.2wt% is less than, dry slag ball is obtained, by institute
Dry slag ball cooling is stated, screening is obtained final product.
Further, the temperature of the calcination processing is 300 ~ 350 DEG C, and the time is 30 ~ 40 minutes.
Compared with prior art, beneficial effects of the present invention are as follows：
Free-floride slag former of the invention is used in converter steelmaking process, and using the discarded slag of steel mill's steel-making secondary utilization is carried out, and is matched somebody with somebody
Plus flux, steelmaking feed etc., produce pelletizing and return the floride-free slag former of converter work steel-making.Steel mill's waste residue refers to and made steel in the present invention
The solid waste discharged in journey, including vessel slag, electroslag etc..Steel mill's waste residue of the present invention only need to be carried out in use to it
Pulverization process, technological operation difficulty very little, cost is relatively low.Free-floride slag former Jing steel mills success of the test of the invention, is fully able to replace
For fluorite as slag-making fluxing agent, and the corrosion function to furnace lining is substantially reduced, reduce environmental pollution, and reduce lime use
Amount.And, gained free-floride slag former has obvious desulfurization, dephosphorization function, and desulfurization degree can reach more than 90%, and dephosphorization effect reaches
To below 15ppm, it is fully able to meet the demand of pneumatic steelmaking.
Metal ingredient, its contained chemical composition are rich in steel mill's waste residue（wt%）It is as shown in the table：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 10~20% | 35~45% | 15~25% | 12~18% | 4~8% | 1~5% |
, Jing applicant studies for a long period of time discovery, allocate into slag former a certain amount of steel mill's waste residue it is not only recyclable, using in slag
The beneficiating ingredient such as iron oxide, calcium oxide, magnesia, silica, magnesia, and can also simultaneously play alkali in slag former
The partial action that agent, oxidant and flux are played, plays an important role, together during the whole use of slag former
When also cause slag former to realize preferably phosphor-removing effect.Generally, the present invention had both been investigated and specifically when using steel mill's waste residue
Have studied its own dephosphorization chemical property for possessing, and while take into account the processing cost needed for steel mill's waste residue, both made steel mill give up
Slag obtained efficiently, rationalize secondary utilization, environmental protection, cost-effective purpose are realized again, kill two birds with one stone, effect show
Write.Free-floride slag former of the invention can the discarded slag of efficient utilization steel mill, turn waste into wealth, realize good economic benefit, society
Meeting benefit and environmental benefit, are that steel mill reduces production cost, with good promotional value.
, as flux, and by studying invention, the use of sodium bicarbonate is or not preferably sodium bicarbonate in free-floride slag former of the invention
The fusing point of slag former can be only reduced, and lime desulfurization can also be replaced.Now there are some researches show, the slag former for adding calcium hydroxide takes off
Reaction of Salmon-Saxl rate is only 15% or so, and the present invention can reach more than 90% using the desulphurization reaction rate of sodium bicarbonate, and consumption is suitable, profit
Improved with efficiency.
Free-floride slag former of the invention Jing after preparing product granularity in below 50mm, unit weight >=2.0g/cm3, fusing point is less than
1300 DEG C, rational chemical composition of the invention is equipped with, the demand of pneumatic steelmaking can be fully met, reduce production cost.The present invention
Within the initial stage of smelting in two batches secondary addition stove, ton steel adds 2 ~ 4kg to slag former, produces good economic benefit, can subtract per batch
Few more than lime consumption 2kg, metal loss declines 2.6 ~ 5.2%, reduces more than cooling agent consumption 3kg, stably bessemerizes work
Sequence.
Specific embodiment
For a better understanding of the present invention, present disclosure, but this are further fairly set out with reference to embodiment
Bright protection content is not limited solely to the following examples.In the following description, a large amount of concrete details are given so as to
More thorough understanding of the invention is provided.It will be apparent, however, to one skilled in the art that the present invention can be with
It is carried out without the need for one or more of these details.
Embodiment 1
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：40 parts of steel mill's waste residue, iron scale
7 parts, 13 parts of alumina powder, 5 parts of binding agent, 35 parts of flux.
Wherein, the chemical composition and its weight/mass percentage composition (%) of steel mill's waste residue：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 10 | 41.5 | 23 | 13.5 | 8 | 2 |
The particle diameter of the alumina powder is 200 mesh.
The binding agent is 1 for the weight proportion of bentonite and phenolic resin, the bentonite and phenolic resin：3.
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | Na2O | MgO | Al2O3 | Surplus |
| Content/ | 14 | 12.5 | 20 | 26 | 1 | 18 | 8.5 |
A kind of pneumatic steelmaking preparation method of floride-free slag former, comprises the following steps：
Step S1：Steel mill's waste residue, iron scale, alumina powder and flux are weighed respectively, and batching is crushed, crossed more than 100 mesh
Screen cloth, sends into batch mixer and mixes 12 minutes；
Binding agent is weighed, after adding the water stirring mixing of 7 times of the weight of binder, in adding the batch mixer, with the steel
Factory waste residue, iron scale, alumina powder and flux are again stirring for together 25 minutes, obtain batch mixing；
Step S2：The batch mixing is sent into ball press, balling-up is rolled under pressure 34kN, particle diameter obtains slag to less than 50 millimeters
Ball；
Step S3：The slag ball is placed in into calcination processing in Muffle furnace, to moisture 0.2wt% is less than, dry slag ball is obtained, by institute
Dry slag ball cooling is stated, screening is obtained final product.
The temperature of the calcination processing is 320 DEG C, and the time is 35 minutes.
Embodiment 2
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：35 parts of steel mill's waste residue, iron scale
10 parts, 17 parts of alumina powder, 8 parts of binding agent, 30 parts of flux.
The chemical composition and its weight/mass percentage composition (%) of steel mill's waste residue：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 17.5 | 43 | 18.5 | 14 | 5.5 | 1 |
The particle diameter of the alumina powder is 300 mesh.
The binding agent is 1 for the weight proportion of bentonite and phenolic resin, the bentonite and phenolic resin：2.
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | Na2O | MgO | Al2O3 | Surplus |
| Content | 10 | 15 | 18 | 28.5 | 7 | 10 | 11.5 |
A kind of pneumatic steelmaking preparation method of floride-free slag former, comprises the following steps：
Step S1：Steel mill's waste residue, iron scale, alumina powder and flux are weighed respectively, and batching is crushed, crossed more than 100 mesh
Screen cloth, sends into batch mixer and mixes 10 minutes；
Binding agent is weighed, after adding the water stirring mixing of 5 ~ 10 times of the weight of binder, in adding batch mixer, with the steel mill
Waste residue, iron scale, alumina powder and flux are again stirring for together 30 minutes, obtain batch mixing；
Step S2：The batch mixing is sent into ball press, balling-up is rolled under pressure 30kN, particle diameter obtains slag to less than 50 millimeters
Ball；
Step S3：The slag ball is placed in into calcination processing in Muffle furnace, to moisture 0.2wt% is less than, dry slag ball is obtained, by institute
Dry slag ball cooling is stated, screening is obtained final product.
The temperature of the calcination processing is 300 DEG C, and the time is 40 minutes.
Embodiment 3
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：44 parts of steel mill's waste residue, iron scale
5 parts, 10 parts of alumina powder, 1 part of binding agent, 40 parts of flux.
The chemical composition and its weight/mass percentage composition (%) of steel mill's waste residue：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 13 | 35 | 25 | 18 | 6 | 2 |
The particle diameter of the alumina powder is 200 mesh.
The binding agent is that the weight proportion of bentonite and hydroxymethyl cellulose, the bentonite and hydroxymethyl cellulose is
2.5：1.
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | Na2O | MgO | Al2O3 | Surplus |
| Content | 11 | 13.5 | 12 | 30 | 8 | 16 | 9.5 |
A kind of pneumatic steelmaking preparation method of floride-free slag former, comprises the following steps：
Step S1：Steel mill's waste residue, iron scale, alumina powder and flux are weighed respectively, and batching is crushed, crossed more than 100 mesh
Screen cloth, sends into batch mixer and mixes 15 minutes；
Binding agent is weighed, after adding the water stirring mixing of 5 ~ 10 times of the weight of binder, in adding batch mixer, with the steel mill
Waste residue, iron scale, alumina powder and flux are again stirring for together 30 minutes, obtain batch mixing；
Step S2：The batch mixing is sent into ball press, balling-up is rolled under pressure 40kN, particle diameter obtains slag to less than 50 millimeters
Ball；
Step S3：The slag ball is placed in into calcination processing in Muffle furnace, to moisture 0.2wt% is less than, dry slag ball is obtained, by institute
Dry slag ball cooling is stated, screening is obtained final product.
The temperature of the calcination processing is 350 DEG C, and the time is 30 minutes.
Embodiment 4
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：40 parts of steel mill's waste residue, iron scale
8 parts, 12 parts of alumina powder, 2 parts of binding agent, 38 parts of flux.
The chemical composition and its weight/mass percentage composition (%) of steel mill's waste residue：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 15 | 39 | 21 | 12 | 5 | 4 |
The particle diameter of the alumina powder is 300 mesh.
The binding agent is that the weight proportion of bentonite and hydroxymethyl cellulose, the bentonite and hydroxymethyl cellulose is
3.2：1.
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | Na2O | MgO | Al2O3 | Surplus |
| Content | 5 | 18 | 21 | 25 | 6 | 15 | 10.0 |
Embodiment 5
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：50 parts of steel mill's waste residue, iron scale
5 parts, 10 parts of alumina powder, 5 parts of binding agent, 30 parts of flux.
The chemical composition and its weight/mass percentage composition (%) of steel mill's waste residue：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 20 | 37.5 | 16.5 | 14.5 | 4 | 5 |
The particle diameter of the alumina powder is 200 mesh.
The binding agent is bentonite.
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | Na2O | MgO | Al2O3 | Surplus |
| Content | 15 | 20 | 17 | 18 | 4.5 | 13 | 12.5 |
Embodiment 6
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：38 parts of steel mill's waste residue, iron scale
6 parts, 14 parts of alumina powder, 10 parts of binding agent, 32 parts of flux.
The chemical composition and its weight/mass percentage composition (%) of steel mill's waste residue：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 18 | 36 | 15 | 16 | 6 | 5 |
The particle diameter of the alumina powder is 200 mesh.
The binding agent is bentonite, the mixture that phenolic resin and hydroxymethyl cellulose are constituted, the weight proportion of three
For 2：1：1,
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | Na2O | MgO | Al2O3 | Surplus |
| Content | 8 | 19 | 22.5 | 23 | 2.5 | 14.5 | 10.5 |
Embodiment 7
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：45 parts of steel mill's waste residue, iron scale
7 parts, 15 parts of alumina powder, 1 part of binding agent, 32 parts of flux.
The chemical composition and its weight/mass percentage composition (%) of steel mill's waste residue：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 11 | 40 | 20 | 17 | 7 | 3 |
The particle diameter of the alumina powder is 300 mesh.
The binding agent is bentonite, the mixture that phenolic resin and hydroxymethyl cellulose are constituted, the weight proportion of three
For 2.5：0.8：1.
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | Na2O | MgO | Al2O3 | Surplus |
| Content | 12 | 16 | 24 | 22 | 5 | 12.5 | 8.5 |
Embodiment 8
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：40 parts of steel mill's waste residue, iron scale
8 parts, 12 parts of alumina powder, 3 parts of binding agent, 37 parts of flux.
The chemical composition and its weight/mass percentage composition (%) of steel mill's waste residue：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 12 | 45 | 17.5 | 15 | 5 | 4 |
The particle diameter of the alumina powder is 200 mesh.
The binding agent is phenolic resin and hydroxymethyl cellulose, and both weight proportions are 1：0.5.
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | Na2O | MgO | Al2O3 | Surplus |
| Content | 9 | 10 | 25 | 24 | 3 | 17 | 12.0 |
Comparative example 1
The present embodiment pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：38 parts of alumina, iron scale
6 parts, 14 parts of alumina powder, 10 parts of binding agent, 32 parts of flux.
The particle diameter of the alumina powder is 200 mesh.
The binding agent is bentonite, the mixture that phenolic resin and hydroxymethyl cellulose are constituted, the weight proportion of three
For 2：1：1,
The flux is lime stone.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | MgO | Al2O3 | Surplus |
| Content | 18.2 | 21.8 | 26.0 | 2.6 | 27.1 | 4.3 |
A kind of pneumatic steelmaking preparation method of floride-free slag former, comprises the following steps：
Step S1：Alumina, iron scale, alumina powder, flux and binding agent are weighed respectively, and batching is crushed, and crosses 100 mesh
With upper screen cloth, in sending into batch mixer；
The water of 7 times of the weight of binder, stirring mixing 40 minutes is added to obtain batch mixing；
Step S2：The batch mixing is sent into ball press, balling-up is rolled under pressure 34kN, particle diameter obtains slag to less than 50 millimeters
Ball；
Step S3：The slag ball is placed in into calcination processing in Muffle furnace, to moisture 0.2wt% is less than, dry slag ball is obtained, by institute
Dry slag ball cooling is stated, screening is obtained final product.
The temperature of the calcination processing is 320 DEG C, and the time is 35 minutes.
Comparative example 2
The present embodiment pneumatic steelmaking free-floride slag former, as different from Example 6, by the raw material system of following weight
Into：50 parts of fluorite, 6 parts of iron scale, 9 parts of alumina powder, 5 parts of binding agent, 30 parts of flux.
Fluorite：Contain CaF by weight percentage2≥75%、SiO2≤18.5%。
The particle diameter of the alumina powder is 200 mesh.
The binding agent is bentonite, the mixture that phenolic resin and hydroxymethyl cellulose are constituted, the weight proportion of three
For 2：1：1,
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | CaF2 | SiO2 | Fe2O3 | CaO | MgO | Al2O3 | Surplus |
| Content | 32.5 | 8.2 | 21.5 | 23.8 | 1.2 | 7.0 | 5.8 |
The present embodiment pneumatic steelmaking preparation method of floride-free slag former is repeated no more with embodiment 1.
Comparative example 3
A kind of pneumatic steelmaking is made up with floride-free slag former of the raw material of following weight：30 parts of steel mill's waste residue, iron scale
14 parts, 14 parts of alumina powder, 10 parts of binding agent, 32 parts of flux.
The chemical composition and its weight/mass percentage composition (%) of steel mill's waste residue：
| Project | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | Surplus |
| Content | 18 | 36 | 15 | 16 | 6 | 5 |
The particle diameter of the alumina powder is 200 mesh.
The binding agent is glass and bentonitic mixture, and glass and bentonitic weight ratio are 1：1,
The flux is sodium bicarbonate.
The pneumatic steelmaking chemical composition and its weight percentage (%) of floride-free slag former：
| Project | SiO2 | Fe2O3 | CaO | Na2O | MgO | Al2O3 | Surplus |
| Content | 7 | 28 | 25 | 20 | 2 | 11 | 7 |
A kind of pneumatic steelmaking of the present embodiment preparation method of floride-free slag former, comprises the following steps：
Step S1：Steel mill's waste residue is placed in into Muffle furnace 300 DEG C of calcination processings 45 minutes, natural cooling；
Then steel mill's waste residue, iron scale, alumina powder and flux are weighed respectively, and batching is crushed, and is crossed more than 100 mesh and is sieved
Net, sends into batch mixer and mixes 40 minutes, obtains batch mixing；
Step S2：The batch mixing is sent into ball press, binding agent is added, balling-up is rolled under pressure 40kN, particle diameter is to 50 millimeters
Hereinafter, slag ball is obtained；
Step S3：The slag ball is placed in drying bed, 105 DEG C of dryings to moisture are less than 0.2wt%, dry slag ball are obtained, by institute
Dry slag ball cooling is stated, screening is obtained final product.
Effect assessment
1.1 implementations：Product of the present invention is added in converter by manual input or feed bin in convertor steelmaking process with steel stream,
All slag formers are added according to identical batch and time；
Test group：The slag former for being prepared using the embodiment of the present invention 1 ~ 8 respectively, detection stove number is respectively 50 stoves；
Blank group：Any slag former is not used, detection stove number is 50 stoves；
Control group：The slag former prepared using comparative example 1 ~ 3, detection stove number is 50 stoves；
Observe, detect and record the application effect of slag former, sludging time, the sulfur content of steel grade, phosphorus content.
1.2 observing effects
The slag former of embodiment 1 ~ 8, comparative example 1, mobile performance is good, and slagging is fast, corrosion-free to furnace lining；
The slag former of comparative example 2 ~ 3, mobile performance is good, and slagging is slower, obvious to the corrosion phenomenon of furnace lining.
1.3 testing results
The sludging time of table 1 compares
| Project | Blank group | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Average sludging time（Second） | - | 90 | 95 | 100 | 104 | 110 | 80 | 83 | 92 | 126 | 139 | 132 |
As shown in Table 1, the slag former fusing sludging time using the embodiment of the present invention 1 ~ 8 is short（≤ 110 seconds）, than comparative example 1 ~
3 sludging times substantially shorten, illustrate slag former of the invention prepared be used for pneumatic steelmaking using can rapid slagging, shorten and smelt
Time, production efficiency is improved.
Sulfur content and desulfurization degree compare in the finished product of table 2
| Project | Blank group | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Sulfur content（ppm） | 67 | 4 | 6 | 6 | 5 | 6 | 5 | 6 | 6 | 20 | 24 | 27 |
| Desulfurization degree（%） | - | 94.0 | 91.0 | 91.0 | 92.5 | 91.0 | 92.5 | 91.0 | 91.0 | 70.1 | 64.2 | 59.7 |
Note：Desulfurization degree=（Experimental group-blank group）/ blank group * 100%.
As shown in Table 2, blank group is compared, after slag former, sulfur content is substantially reduced in finished steel.Embodiment 1 ~ 8 is made
The desulfurization degree of slag agent is 91.0 ~ 94.0%, and the desulfurization degree of the slag former of comparative example 1 is 70.1%, and the desulfurization degree of the slag former of comparative example 2 is
64.2%, the desulfurization degree of the slag former of comparative example 3 is 59.7%, above-mentioned data display, each composition coordinated of slag former of the present invention, is made
Obtain desulfurized effect more notable, desulfuration efficiency more preferably, illustrates that slag former of the present invention has stronger desulfurized effect.
Phosphorus content and dephosphorization rate compare in the finished product of table 3
| Project | Blank group | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Phosphorus content（ppm） | 92 | 7.5 | 7 | 9.5 | 9 | 11 | 5 | 6 | 10 | 21 | 29 | 35 |
| Dephosphorization rate（%） | - | 91.8 | 92.4 | 89.7 | 90.2 | 88.0 | 94.6 | 93.5 | 89.1 | 77.2 | 68.5 | 62.0 |
Note：Dephosphorization rate=（Experimental group-blank group）/ blank group * 100%.
As shown in Table 3, blank group is compared, after slag former, finished product steel grade phosphorus content is substantially reduced.Embodiment 1 ~ 8 is made
The dephosphorization rate of slag agent is 88.0 ~ 94.6%, and the dephosphorization rate of the slag former of control group 1 is 77.2%, and the dephosphorization rate of the slag former of control group 2 is
68.5%, the dephosphorization rate of the slag former of control group 3 is 62.0%.Above-mentioned data display, using slag former the dephosphorization of steel grade can be improved
Rate, reduces impurity phosphorus content；Dephosphorization effect simultaneously using slag former of the present invention is more preferable, and steel grade phosphorus content is less than 15ppm, effect
Fruit is prominent, illustrates slag former reasonable composition of the present invention, and coordinated, performance is more excellent, more stable.
Above-mentioned data display, slag former of the present invention is used for pneumatic steelmaking, can rapid slagging, sludging time shorten,
Shorten refining time, improve production efficiency；Simultaneously the more existing slag former of desulfuration efficiency is significantly improved, it is maintained at 91.0 ~
Between 94.0%；Dephosphorization effect is obviously improved, and dephosphorization rate is 88.0 ~ 94.6%；And it is stable in properties in use,
Splash is avoided or greatly reduced, is saved because of expense and times such as splash cleaning fire door, spray guns, improve production efficiency.
Finally illustrate, above example is only to illustrate technical scheme and unrestricted, and this area is common
Other modifications or equivalent that technical staff is made to technical scheme, without departing from technical solution of the present invention
Spirit and scope, all should cover in the middle of scope of the presently claimed invention.
Claims (8)
1. a kind of pneumatic steelmaking is with floride-free slag former, it is characterised in that：It is made up of the raw material of following weight：Steel mill's waste residue
35 ~ 50 parts, 5 ~ 10 parts of iron scale, 10 ~ 20 parts of alumina powder, 1 ~ 10 part of binding agent, 30 ~ 40 parts of flux.
2. pneumatic steelmaking as claimed in claim 1 is with floride-free slag former, it is characterised in that：The chemical composition of steel mill's waste residue
And its weight/mass percentage composition is：Silica 10 ~ 20%, calcium oxide 35 ~ 45%, alundum (Al2O3) 15 ~ 25%, di-iron trioxide 12 ~
18%, magnesia 4 ~ 8%, balance of inevitable trace element.
3. pneumatic steelmaking as claimed in claim 1 is with floride-free slag former, it is characterised in that：The particle diameter of the alumina powder be 200 ~
300 mesh.
4. pneumatic steelmaking as claimed in claim 1 is with floride-free slag former, it is characterised in that：The binding agent is bentonite, phenol
One or more composition in urea formaldehyde, hydroxymethyl cellulose.
5. pneumatic steelmaking as claimed in claim 1 is with floride-free slag former, it is characterised in that：The flux is sodium bicarbonate.
6. pneumatic steelmaking as claimed in claim 1 is with floride-free slag former, it is characterised in that：Pneumatic steelmaking free-floride slag making
The chemical composition and its weight percentage of agent be：Silica 5 ~ 15%, di-iron trioxide 10 ~ 20%, calcium oxide 12 ~ 25%, oxygen
Change sodium 18 ~ 30%, magnesia 1 ~ 8%, alundum (Al2O3) 10 ~ 18%, balance of inevitable trace element.
7. a kind of pneumatic steelmaking preparation method of floride-free slag former, it is characterised in that：Comprise the following steps：
Step S1：Steel mill's waste residue, iron scale, alumina powder and flux are weighed respectively, and batching is crushed, crossed more than 100 mesh
Screen cloth, sends into batch mixer and mixes 10 ~ 15 minutes；
Weigh binding agent, it is and described in adding the batch mixer after adding the water stirring mixing of 5 ~ 10 times of the weight of binder
Steel mill's waste residue, iron scale, alumina powder and flux are again stirring for together 20 ~ 30 minutes, obtain batch mixing；
Step S2：The batch mixing is sent into ball press, balling-up is rolled under 30 ~ 40kN of pressure, particle diameter is obtained to less than 50 millimeters
Slag ball；
Step S3：The slag ball is placed in into calcination processing in Muffle furnace, to moisture 0.2wt% is less than, dry slag ball is obtained, by institute
Dry slag ball cooling is stated, screening is obtained final product.
8. the pneumatic steelmaking as claimed in claim 7 preparation method of floride-free slag former, it is characterised in that：The calcination processing
Temperature be 300 ~ 350 DEG C, the time be 30 ~ 40 minutes.
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|---|---|---|---|---|
| CN109338027A (en) * | 2018-11-02 | 2019-02-15 | 武汉钢铁有限公司 | A kind of coverter pig pre-melted type compound slagging agent and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560586A (en) * | 2009-04-23 | 2009-10-21 | 重庆大学 | Compound dephosphorization agent with converter slag as raw material and preparing method thereof |
| CN104278124A (en) * | 2014-10-11 | 2015-01-14 | 中南大学 | Dephosphorizing agent and application thereof |
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2016
- 2016-12-28 CN CN201611235873.6A patent/CN106636535A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560586A (en) * | 2009-04-23 | 2009-10-21 | 重庆大学 | Compound dephosphorization agent with converter slag as raw material and preparing method thereof |
| CN104278124A (en) * | 2014-10-11 | 2015-01-14 | 中南大学 | Dephosphorizing agent and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109338027A (en) * | 2018-11-02 | 2019-02-15 | 武汉钢铁有限公司 | A kind of coverter pig pre-melted type compound slagging agent and preparation method thereof |
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Application publication date: 20170510 |