CN104294007A - High-performance briquette employing sodium carbonate and steel slag, and manufacture method thereof - Google Patents
High-performance briquette employing sodium carbonate and steel slag, and manufacture method thereof Download PDFInfo
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- CN104294007A CN104294007A CN201410139037.2A CN201410139037A CN104294007A CN 104294007 A CN104294007 A CN 104294007A CN 201410139037 A CN201410139037 A CN 201410139037A CN 104294007 A CN104294007 A CN 104294007A
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- briquetting
- slag
- sodium carbonate
- steel
- binding agent
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C5/00—Working or handling ice
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
- F25C1/22—Construction of moulds; Filling devices for moulds
-
- 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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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Production, Working, Storing, Or Distribution Of Ice (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a briquette and a manufacture method thereof, more particularly to a briquette containing a desulfurizing agent, i.e., carbonate and steel slag, and a binding agent for steel liquid in a desulfurizing converter, and a manufacture method thereof. According to the present invention, the steel liquid is desulfurized for the first time in the high-temperature converter before the steel liquid is output to a steel holding barrel, and a highly-efficient desulfurizing briquette for additional desulfurizing through stirring by the aid of the falling force when the steel liquid is output to the steel holding barrel is provided.
Description
Technical field
The present invention relates to briquetting and manufacture method thereof, relate to especially in detail a kind of strengthen molten steel desulfuration efficiency and improve the quality of molten steel, and the briquetting making minimizing steel making working procedure and raise the efficiency and manufacture method thereof.
Background technology
Briquetting is the group of being pinched by the powder of coal or coking coal etc., the process for making by product manufacture such as copper smelter slag, steel-making dust produced in the process for making of current recycling Steel Plant.
That is, produce slag or dust in each procedure in Steel Plant, thus, carry out the various researchs that it is recycled.Because slag or dust comprise carbon or iron, therefore, by recycling it, can save cost of raw and processed materials, dust produces in the process such as transport of coal, produces in the processes such as the water control of dust of the waste gas of slag in cast iron manufacture.
Generally speaking, because the volume of dust or slag is too little, be difficult to direct use, therefore, add binding agent and create spherical rear use, or add binding agent in dust or slag, using after creating briquetting.
In order to the content of the sulphur of control effect iron and steel performance, in common iron-smelting process, produce molten iron in blast furnace after, conveying also carries out desulfurization process by pre-treatment or Kanvara reaction process.Now, the molten iron completing desulfuration operations is transported to converter, loads the main raw material such as scrap iron and molten iron, and be blown into hyperbaric oxygen from top in converter, and forces from below to be blown into rare gas element, and performs blowing operation.
The molten steel of tapping when completing blowing operation is housed inside steel teeming ladle.Now, in order to remove sulfur component remaining in molten steel, in steel teeming ladle, drop into the fluorite (fluorite) etc. as the auxiliary materials such as desulfurization lime (CaO) and the sweetening agent for raising desulfuration efficiency.Afterwards, in order to promote reaction, in molten steel, high pressure argon gas is injected.Make to produce pump circulation whipping force in this steel teeming ladle, and carry out the reaction of removing sulfur component in molten steel.
This existing method, the method of artificial whipping force is applied to molten steel, namely, the method of argon gas is blown into the top of steel teeming ladle and bottom that accommodate molten steel, take and the rifle being blown into gas from the top of steel teeming ladle to be declined and after immersing molten metal, argon gas is blown in molten metal, and the device of supply gas is connected to the bottom of steel teeming ladle, by the mode that gas is blown into from the bottom of molten steel.
This type of artificially reaction promotion method because of the reaction efficiency of the lime and sulphur that drop into molten steel low, and make desulfuration efficiency extremely low, and, gas blowing time for artificial whipping force being applied to steel teeming ladle is required to reach more than 10 minute, therefore, the reason making the productivity of overall process for making low is become.
Further, this mode has following problem: inert argon directly injected in molten steel, thus reduces processing temperature sharp.Therefore, in order to overcome this problem, requirement must improve the operation outlet temperature of converter, the additional technique that could tap.
Further, for the existing mode dropping into fluorite and desulfurization to steel teeming ladle, there is following shortcoming: make because of mutual chemical reaction to contain fluorine in slag, thus, slag cannot be recycled.
Prior art document
Patent documentation
(patent documentation 1) KR2011-0052086A1
Summary of the invention
Technical task
The invention provides the converter that a kind of direct input melting has molten steel, and improve briquetting and the manufacture method thereof of the sweetening power of molten steel.
The invention provides the converter that a kind of direct input melting has molten steel, and the briquetting preventing from causing temperature to decline because being blown into argon gas in molten steel and manufacture method thereof.
The invention provides the converter that a kind of direct input melting has molten steel, and do not drop into fluorite to steel teeming ladle, also can the briquetting of desulfurization and manufacture method thereof effectively.
The invention provides one and effectively improve technique, and shorten briquetting and the manufacture method thereof of activity duration.
Technical scheme
The briquetting of embodiments of the invention comprises: for removing the sweetening agent of sulphur and sodium carbonate and slag and binding agent in converter.
Be contained in the described sodium carbonate of briquetting of the present invention and slag and binding agent, it is characterized in that: the weight ratio comprising 5 ~ 7:1 ~ 2:0.8 ~ 1.
Be contained in the described slag of briquetting of the present invention, it is characterized in that: comprise Al
2o
3, SiO
2, at least a certain in CaO, FeO and MgO.
Further, described slag comprises Na in addition
20
31 to 20 % by weight.
Be contained in the described binding agent of briquetting of the present invention, it is characterized in that: what comprise in wilkinite, zeolite, silica gel, aluminum phosphate, water glass, cement, syrup or starch is at least a certain.
The manufacture method of the briquetting of embodiments of the invention, comprises following steps: prepare sodium carbonate, slag and binding agent; Mix described sodium carbonate, slag and binding agent, manufacture raw material; By described raw material compression molding; The raw material of described compression molding is carried out drying and solidification treatment.
Briquetting manufacture method of the present invention, is characterized in that: the mixing of described sodium carbonate and slag and binding agent is carried out with the weight ratio of 5 ~ 7:1 ~ 2:0.8 ~ 1.
Briquetting manufacture method of the present invention, is characterized in that: described slag, comprises Al
2o
3, SiO
2, at least a certain in CaO, FeO and MgO.
Further, described slag comprises Na in addition
20
31 to 20 % by weight.
Briquetting manufacture method of the present invention, is characterized in that: it is at least a certain that described binding agent comprises in wilkinite, zeolite, silica gel, aluminum phosphate, water glass, cement, syrup or starch.
Briquetting manufacture method of the present invention, is characterized in that: the drying of the raw material of described compression molding and solidification treatment are carried out 18 to 30 hours.
Advantageous effects
According to the liquid steel refining method utilizing briquetting of the present invention, briquetting is fed into the converter that melting has molten steel, start first time sulfur removal technology, during tapping to steel teeming ladle, by the free-falling power of molten steel and the power produced stir, with newly devote the lime of unreacted molten steel and molten steel and add slag and react, carry out second time sulfur removal technology.
Therefore, do not increase other technique of the necessary whipping force applied to molten steel artificially in prior art, can carry out yet, therefore, process efficiency and production efficiency can be improved.
Further, can prevent, in order to apply action of forced stirring power to molten steel, because injecting the existing technique of the argon gas of the high pressure be blown into, and to cause the problem that the temperature of molten steel declines.
And, not using as improving current liquid steel desulphurization efficiency and input fluorite etc., can improve desulfuration efficiency yet, therefore, the problem containing a large amount of fluorine in slag after avoiding reacting, thus, greatly improve the slag recovery utilization rate after technique.
Further, significantly reduce after tapping, because of the CO occurred when dropping into sodium carbonate and reaction in steel teeming ladle
2gas, causes interference operating personnel visual field phenomenon, thus, job stabilization when improving tapping and operation accuracy.
Accompanying drawing explanation
Fig. 1 is the precedence diagram of the briquetting manufacture method of display embodiments of the invention;
Fig. 2 is the precedence diagram of the refining order of the molten steel briefly showing embodiments of the invention.
Embodiment
Below, with reference to accompanying drawing, embodiments of the invention are illustrated in greater detail.But the present invention is not existing due to the embodiment in this display, can various form realize, the present embodiment, as disclosed embodiment of the present invention, is illustrated for making the those of ordinary skill in scope belonging to the present invention understand content of the present invention.Symbol identical on accompanying drawing represents identical key element.
The briquetting of embodiments of the invention comprises as the sodium carbonate of sweetening agent, slag and binding agent.
In the present invention, described sodium carbonate (sodaash; Na
2cO
3) be with chemical association Na
2cO
3and the material be known, for having the raw material of given combinations of more than 99.9%.This type of sodium carbonate, in briquetting of the present invention, carries out reacting with the sulphur in molten steel or phosphorus and plays the effect of removing slag.Specifically reaction is as follows for it.
Na
2CO
3+S→CO+Na
2S
The content of the sodium carbonate being contained in briquetting of the present invention is particularly limited to, but the content of sodium carbonate too much or very few time, few with slag reacting weight, thus, fully can not carry out with the reaction of the sulphur in molten steel or phosphorus, and highlight the amount and the problem that cannot effectively manufacture that only increase slag.Therefore, in the present invention, in the overall weight of manufactured briquetting, require that comprising sodium carbonate reaches more than 50 % by weight, preferably, comprises 50 to 70 % by weight.According to the content of this type of sodium carbonate, when carrying out first time desulfurization being put into before converter tapping, very effectively.But the content of described sodium carbonate, according to the kind of the steel manufactured, suitably can be selected from described content range.
In the present invention, described slag (slag) is by when carrying out second time refining, and for being incubated molten steel and impurity in absorption steel and the brazing flux that uses, and generate on molten iron, main component comprises Al
2o
3, SiO
2, at least a certain formation in CaO, FeO and MgO.
Further, described slag, except main component described above, also comprises Na in addition
2o
3.But, comprise described Na
2o
3time, its content is 1 to 20 % by weight, preferably, comprises 5 to 20 % by weight.Na
2o
3when not being comprised in above-mentioned scope, change the last combination of the molten steel utilizing the last briquetting manufactured, thus, the problem that cannot meet the hardness of last steel occurs.
For the content of slag being contained in briquetting of the present invention, sodium carbonate as described above is the same to be particularly limited to, but the first time in converter is in sulfur removal technology, when the desulphurization reaction considering by sodium carbonate is principal reaction, the content of slag is fewer, and improve desulfuration efficiency, on the contrary, the content of slag is more, and manufactured briquetting is suspended in slag layer, thus, the problem causing the sweetening effectiveness carrying out reacting at slag surface to reduce by half.There is following problem in addition, because in briquetting, the content of sodium carbonate is few, fully can not obtain required desulfurization and the reaction efficiency of dephosphorization.
Therefore, in the present invention, proportionally the content of described slag and the content of described sodium carbonate is comprised.Particularly, described slag and sodium carbonate are with the weight ratio of 1 ~ 2:5 ~ 7, and preferably, the weight ratio of 1 ~ 1.5:5.5 ~ 6.5, the more preferably weight ratio of 1 ~ 1.2:5.5 ~ 6, most preferably, the weight ratio of 1:5.5 is contained in briquetting of the present invention.
In the present invention, binding agent (Binder) is a kind of viscosity increasing briquetting, is mixed into the state being easy to sodium carbonate and slag are reacted to each other, plays the material making generation cohesion.It is at least a certain that this type of binding agent can be selected in wilkinite, zeolite, silica gel, aluminum phosphate, water glass, cement, syrup or starch.
The binding agent being contained in briquetting of the present invention, in a large number containing sometimes, in the manufacturing process of briquetting, changing the last combination of molten steel, producing the problem that cannot meet the hardness of last steel thus because being contained in the composition of binding agent etc.Therefore, preferably, binding agent cohesion is the state being mutually mixed with sodium carbonate and slag, the amount containing energy smooth execution level of response.Particularly, the binder content in the present invention and the content balance of sodium carbonate, comprise the weight ratio of 0.8 ~ 1:5 ~ 7, preferably the weight ratio of 0.8 ~ 1:5.5 ~ 6.5, more preferably the weight ratio of 0.8 ~ 1:5.5 ~ 6, most preferably the weight ratio of 0.8:5.5.
Below, with reference to Fig. 1, briquetting manufacture method of the present invention is described.
The manufacture method of the briquetting of embodiments of the invention, comprises the following steps: prepare sodium carbonate, slag and binding agent (S10); Mix the sodium carbonate of described preparation, slag and binding agent, manufacture briquetting raw material (S20); By the briquetting raw material compression molding (S30) of described manufacture; And described shaping briquetting raw material is carried out drying and solidification treatment (S40).
More specifically, first prepare as the sodium carbonate of the composition for the manufacture of briquetting of the present invention, slag and binding agent (S10).
Secondly, by the sodium carbonate, slag and the binding agent that prepare in described S10 step with the weight ratio of 5 ~ 7:1 ~ 2:0.8 ~ 1, the weight ratio of preferably 5.5 ~ 6.5:1 ~ 1.5:0.8 ~ 1, the more preferably weight ratio of 5.5 ~ 6:1:1.2:0.8 ~ 1, most preferably the weight ratio of 5.5:1:0.8 mixes, and manufactures briquetting raw material (S20).
Afterwards, by with the briquetting raw material compression molding (S30) manufactured by described composition and weight ratio.The compression molding of described briquetting raw material in the present invention in the technical field that is suitable for, the general pressure applying 320 to the 400psi used carries out.According to this type of compression molding, briquetting raw material has set hardness.
Briquetting raw material shaping as mentioned above, after super-dry and solidification treatment step (S40), is fabricated to last briquetting.Now, through the step reason of super-dry and curing process be manufacture after the pressure-bearing hardness of briquetting lower than being suitable for carrying and the degree of operation, and refining cannot be used in immediately.This type of drying and set time are more than 18 hours, preferably 18 to 30 hours, more preferably 18 to 24 hours, more than certain temperature, utilize the warm braw of preferably 20 to 40 DEG C and carry out drying and solidification treatment.
Below, be described with reference to the liquid steel refining method of Fig. 2 to embodiments of the invention.Now, the liquid steel refining method of embodiments of the invention refers to the method for refining utilizing the briquetting manufactured as mentioned above.
The liquid steel refining method of embodiments of the invention comprises following technique: after converting process is carried out in converter, drops into the first time sulfur removal technology (S100) of briquetting; Tap to the technique (S200) of steel teeming ladle; And after tapping, to the second time sulfur removal technology (S300) of steel teeming ladle additional input lime and slag.That is, by molten steel from converter tapping to steel teeming ladle before, when briquetting is put into and taps, stir by falling force, thus promote reaction, afterwards, drop into lime and slag, complete and remove other sulphur.
When further illustrating, first molten iron is transferred to converter by from blast furnace, passes through the converting process of reacting with hyperbaric oxygen and manufacture molten steel in converter.
Complete the converting process of molten steel in converter after, drop into briquetting and start first time sulfur removal technology (S100).In the converter of high temperature, because sodium carbonate and sulphur or phosphorus carry out strong reaction, and produce CO together with flame
2, now carry out efficiently sulfur removal technology for the first time.
When completing strong first time desulphurization reaction, inclination converter, by the molten steel tapping in converter to steel teeming ladle (S200).Now carry out by the stirring of falling force to molten steel, unreacted bottom molten steel and sodium carbonate react, and improve desulfuration efficiency again.When tapping, the strong CO produced because of the reaction of sodium carbonate
2formation reaction is carried out in converter, therefore, does not disturb the visual field of operator, thus does not hinder tapping operation.
Further, in described tapping technique, especially from after the technique that starts to tap, lifetime interval, and lime and slag additional input steel teeming ladle are started second time desulphurization reaction (S300).Now, the amount of the lime be put into, according to the kind of the steel of the molten steel of tapping, and is put into steel teeming ladle with different amount, and preferably, every 1kg molten steel drops into 1 to 5g, more preferably, and the amount of 1 to 3g.Further, slag is put into 10 to 20 of the input amount of lime % by weight.Such as, when dropping into the lime of 100kg to molten steel, slag is put into 10 to 20kg.The slag dropped into quantity not sufficient 10 % by weight time, there is the low problem of second time desulphurization reaction, during more than 20 % by weight, compared with input amount, having little effect of second time desulphurization reaction, and uneconomical.
Complete the input of lime and slag in tapping after, continue the tapping certain hour carrying out molten steel, the stirring carried out because of the falling force of this type of persistence, and the molten steel in Keep agitation steel teeming ladle, thus, improve desulfuration efficiency (S400).
Below, embodiment by experiment, further illustrates the present invention.
[table 1] is the experimental result of carrying out the desulfuration efficiency of existing briquetting investing method and briquetting investing method of the present invention, shows the desulfurization results for each investing method and amount.
[table 1]
In [table 1], experiment carries out, with the steel of lime input amount 400kg standard for standard in molten steel is the converter of 280 tons of (ton) standards and steel teeming ladle.The input amount of lime is fixed value (400kg).Whether operation confirms to represent the operation visual field whether ensured before and after tapping.The briquetting being used in experiment is mixed with sodium carbonate 55 % by weight, slag 10 % by weight, binding agent 8 % by weight, is contained in the impurity of slag, Na
20
315 % by weight, CaO9 % by weight, binding agent employs wilkinite.
Comparative example 1 is being tapped from converter after steel teeming ladle by molten steel, dropping into the situation of lime 400kg and briquetting 20kg.Because only carrying out desulfurization in steel teeming ladle, the concentration difference only 2ppm of the sulphur before tapping and after tapping.Further, when from converter tapping, the CO occurred because of the input of briquetting
2gas, thus, cannot confirm operation of tapping.
Comparative example 2 has dropped into lime and the briquetting of amount identical with comparative example 1, but briquetting is before tapping, is put into converter, has carried out first time desulfurization.Further, in tapping process, stir with falling force and improve desulfuration efficiency.Sulphur concentration difference before tapping and after tapping is shown as 8ppm.Because not dropping into briquetting to steel teeming ladle, thus, ensure that tapping operation holistic vision.
In embodiment 1,2 and 3, identical with comparative example, drop into lime 400kg to steel teeming ladle, additional input slag 60kg.Briquetting of the present invention is put into converter but not steel teeming ladle, desulphurization reaction from converter.Each briquetting input amount is 20,40,60kg.
Its result shows, embodiment 1, has dropped into briquetting 20kg to converter, and the sulphur concentration difference of tapping front and rear is 12ppm, and, ensure that the visual field confirming tapping operation.Embodiment 2, has dropped into briquetting 40kg to converter, and the sulphur concentration difference of tapping front and rear is 16ppm, and, ensure that the visual field confirming tapping operation.Embodiment 3, has dropped into briquetting 60kg to converter, and desulphurization reaction starts to carry out to arriving steel teeming ladle after tapping from converter, and desulfurization amount, when front and rear of tapping compares, reaches 21ppm.But, because producing gas, be difficult to the visual field of guaranteeing tapping operation.
As mentioned above, the briquetting of embodiments of the invention, as shown in Figure 2, directly drops into converter by briquetting, thus, can shorten the refining time of molten steel.Further, the power that lime input in molten steel and slag fall by molten steel and the whipping force that produces mixes, thus, not requiring the existing technique being blown into Ar gas in order to stir molten steel, the temperature of molten steel can be avoided to decline.In addition, eliminate the technique being blown into Ar gas, improve efficiency and the productivity of technique.
Further, removing the sulfur component in molten steel by utilizing briquetting, may instead be the current desulfuration efficiency of raising and the fluorite dropped in molten steel.Thus, the fluorine that fluorite can be avoided to produce is contained in slag, improves the recovery utilization rate of slag.
Describe the present invention with reference to accompanying drawing and above-described embodiment, but the present invention is not defined in this, content of the present invention limited by right.Therefore, those skilled in the art, are not departing within the scope of right technological thought, can carry out various distortion and amendment to the present invention.
Claims (7)
1. a briquetting, this briquetting comprises sweetening agent for liquid steel desulphurization in converter and sodium carbonate, slag and binding agent, it is characterized in that:
Described slag comprises Al
2o
3, SiO
2, at least a certain and Na in CaO, FeO and MgO
20
3, described Na
20
3comprise 1 to 20 % by weight.
2. briquetting according to claim 1, is characterized in that:
Described sodium carbonate and slag and binding agent are the weight ratio of 5 ~ 7:1 ~ 2:0.8 ~ 1.
3. briquetting according to claim 1, is characterized in that:
Described binding agent comprises at least one in wilkinite, zeolite, silica gel, aluminum phosphate, water glass, cement, syrup or starch.
4. a manufacture method for briquetting, is characterized in that,
Comprise the following steps:
Prepare sodium carbonate, slag and binding agent, wherein, described slag, comprises Al
2o
3, SiO
2, at least a certain and Na in CaO, FeO and MgO
20
3, and described Na
20
3containing 1 to 20 % by weight;
Mix described sodium carbonate, slag and binding agent, manufacture raw material;
By described raw material compression molding;
The raw material of described compression molding is carried out drying and solidification treatment.
5. the manufacture method of briquetting according to claim 4, is characterized in that:
Described sodium carbonate and slag and binding agent are the weight ratio of 5 ~ 7:1 ~ 2:0.8 ~ 1.
6. the manufacture method of briquetting according to claim 4, is characterized in that:
It is at least a certain that described binding agent comprises in wilkinite, zeolite, silica gel, aluminum phosphate, water glass, cement, syrup or starch.
7. the manufacture method of briquetting according to claim 4, is characterized in that:
The treatment step of described drying and solidification carries out 18 to 30 hours.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130040399A KR102170139B1 (en) | 2013-04-12 | 2013-04-12 | Ice manufacturing apparatus and the method thereof |
| KR10-2013-0040399 | 2013-04-12 |
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| Publication Number | Publication Date |
|---|---|
| CN104294007A true CN104294007A (en) | 2015-01-21 |
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| CN201410139037.2A Pending CN104294007A (en) | 2013-04-12 | 2014-04-04 | High-performance briquette employing sodium carbonate and steel slag, and manufacture method thereof |
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|---|---|
| KR (1) | KR102170139B1 (en) |
| CN (1) | CN104294007A (en) |
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|---|---|
| KR20140123283A (en) | 2014-10-22 |
| KR102170139B1 (en) | 2020-10-26 |
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Application publication date: 20150121 |