CN103170614A - Process for using steel making waste slag as molten iron desulphurization slag-off plate coating materials - Google Patents
Process for using steel making waste slag as molten iron desulphurization slag-off plate coating materials Download PDFInfo
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- CN103170614A CN103170614A CN2013100676664A CN201310067666A CN103170614A CN 103170614 A CN103170614 A CN 103170614A CN 2013100676664 A CN2013100676664 A CN 2013100676664A CN 201310067666 A CN201310067666 A CN 201310067666A CN 103170614 A CN103170614 A CN 103170614A
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Abstract
The invention provides a process for using steel making waste slag as molten iron desulphurization slag-off plate coating materials. The process for using the steel making waste slag as the molten iron desulphurization slag-off plate coating materials comprises the following steps: tundish powder waste coating, finery waste white slag powder and petroleum coke powder are mixed by mass percent of 60:35:5; the mixed tundish powder waste coating, finery waste white slag powder and petroleum coke powder are placed in a JSD-2 type stirrer; then industrial water or production water is added to mix; after uniform mixing, the mixture of the tundish powder waste coating, the finery waste white slag powder, the petroleum coke powder, the industrial water or the production water are poured into a steel coal tub for later use, wherein water and mixture placed in the stirrer are mixed by mass percent of 3.5:1; molten iron desulphurization slag-off adopts a QZB full pneumatic slag-off device to work, before slag-off, a slag-off part is immersed into adhesive coating in the steel coal tub; when the adhersive coasting is 2.8-3.2 cm in thickness, the slag-off plate is lifted, naturally cooled and dried for 5 min, and then slag-off operation is conducted, wherein temperature of the molten iron desulphurization slag is controlled to be in a range of 1100-1200 DEG C, and heat-resistance temperature of the slag-off plate is controlled in a range of 800-900 DEG C.
Description
Technical field
The present invention relates to steel mill refining furnace waste residue, tundish castaway slag through recycling, the pretreated slag skimming process of molten iron that is used for steel mill, for the workload that the consumption that reduces molten iron drossing plate, minimizing are skimmed, the improvement that promotes environmental protection condition has great facilitation.
Background technology
In the process for making production process, the generation of conticaster tundish waste residue is mainly derived from used tundish paint.No matter any tundish paint, adopting wet method to stir before using becomes the walk shape, perhaps adopts binding agent, smears moulding on the tundish inwall, then toasts as anti-material and uses.Conticaster is in operation process, some is entered molten steel under the physics souring of molten steel the calcareous coating of magnesium, become inclusion floating in the slag blanket of tundish surface, perhaps enter in tundish paint along the middle hole of tundish paint, perhaps stay in molten steel, this part accounts for 1/3rd of tundish paint, and the end that two the coating that its excess-three is divided waters time along with one of the tundish tundish of being tumbled turns over the bag district, becomes a kind of discarded object of steel-making.Due to this discarded object, in turning over the bag use procedure, the oxide that contains K, Na ion in the coverture slag in tundish is sneaked into wherein, owing to having contained K, Na ion, will reduce the fusing point of this discarded object, so the discarded coating of tundish is difficult to recycle as the refractory material in steelmaking process, its potential value does not obtain having at present to be utilized and exploitation.
In the hot metal pretreatment technology process of steel mill, desulfurizing iron finishes, the desulfurization slag that claws the ladle surface technique that is absolutely necessary.in the process of skimming, the steel slag removal device of Cinder Machine and molten iron and the desulfurizing slag of hot metal of high temperature contact, although the temperature of molten iron is at 1230～1350 ℃, the temperature of desulfurizing slag of hot metal is between 1100～1200 ℃, lower than the slag removal device material with 100～180 ℃ of the fusing points of steel, but under the condition of high-temperature operation, steel plate is subjected to the heat transfer of iron liquid and desulfurization slag, temperature is higher, skim in operation process, the temperature of slag removal device is at 800～900 ℃, at this temperature, take off slag operation in the process of skimming, slag removal device claws desulfurization slag in ladle, the effect of the mechanical force between slag removal device and desulfurization slag, the contact friction function of slag removal device and bottom iron liquid, cause the high temperature scaling loss, the sticking iron distortion of slag removal device is serious in addition, it is also the key factor that affects the slag removal device life-span, make the life-span of slag removal device maintain 8～35 times, the replacing number of times of slag removal device is more, not only the consumption of steel plate increases, and the hand labor amount in Renewal process is larger, how to extend the life-span of slag removal device, it is the key that reduces the desulfurization operations cost.
Searching document discloses: the history of (1) Wu Wuhua, the continuous casting liner in dundishs such as Xue Wendong, Gao Changhe and latest Progress material Leader 2006(20 volume thereof) do not mention application problem (2) the Lu Hong ancestral electric furnace steel making question and answer metallurgical industry publishing house 2012 year document statement of tundish castaway slag in the steel-making metallurgical process in the middle of the document: " the refining white slag in temperature lower than 560 ℃, the 2CaO SiO in slag
2Crystal transfer can occur, by β-2CaO SiO
2→ γ-2CaO SiO
2Change, and be attended by 5% volumetric expansion, produce powder phenomenon-tion, the main component of refining furnace white slag efflorescence is 2CaO SiO
2, and be mingled with a small amount of nCaOmA
2O
3Deng the gelling material ".(3) research of Wu Ming molten iron magnesium desulfurization high efficiency be applied in 2008(6 in " China metallurgical ") content of statement discloses: Co., Ltd of Magang Stocks Trading Co. the first steel rolls the molten iron drossing plate of head factory, in order to improve the life-span, used main component to be nano-graphite, the scum interleaving agent of high-temperature resin, first the slag rake is soaked in people's interleaving agent before skimming, its surface forms one deck high temperature barrier film, make molten iron in the process of skimming, slag does not adhere to skim and harrows the surface and keep the slag rake indeformable, solved again simultaneously because forming the problem of large iron stone roller on molten iron and bits adhesion slag rake, strengthened the effect of skimming, reduced iron loss.
Learn according to above document: in order to extend the life-span of molten iron drossing plate, the material cost of use is higher, at present also refining white slag and tundish waste is not applied to precedent on molten iron drossing plate as anti-material.
The present invention adopts steel mill refining furnace waste residue, the recycling of tundish castaway slag, extends the life-span of slag removal device, reduces the desulfurization operations cost, and this technique has one's own knack, and the energy-saving and cost-reducing exemplary role that played for enterprise has important promotional value.
Summary of the invention
The object of the invention is to: with steel mill refining furnace waste residue, the recycling of tundish castaway slag, the slag skimming process that is used for the Hot Metal Pretreatment of steel mill, change the workload of slag removal device for the consumption that reduces molten iron drossing plate, minimizing, the improvement that promotes environmental protection condition is had great facilitation.
The object of the present invention is achieved like this: a kind of steel-making waste residue that utilizes is as the technique of desulfurizing iron slag removal device coating material, take 3 * 120 tons of converters as example;
Coating material preparation: with the discarded coating of tundish powder, refining furnace is discarded the 60:35:5 mixing by mass percentage of white slag powder, petroleum coke powder, is placed in JSD-2 type mixer, adds water for industrial use or industrial water to mix, after mixing, pour in the steel coal tub stand-by; Wherein water and the compound that is placed in mixer by mass percentage 3.5:1 mix and get final product;
Use operation: desulfurizing iron is skimmed and is adopted the complete pneumatic Cinder Machine operation of QZB, and the son of skimming before skimming immerses adherent coating in the steel coal tub, when adherent coating thickness reaches 2.8-3.2cm, promotes slag removal device, naturally cold really with dry 5min, i.e. slag operation is taken off in enforcement; The temperature of wherein controlling desulfurizing slag of hot metal is 1100-1200 ℃, and the heat resisting temperature of slag removal device is 800-900 ℃;
Wherein the granularity of the discarded coating of powder used is less than 3mm, and the petroleum coke coke fines size is less than 1mm.
Know-why of the present invention: with the gelling material that contains in the middle of the refining furnace white slag as and the bonding binding agent of slag removal device, add the tundish waste composition of part and the resistance to slag material of part, barrier material as slag removal device uses, wherein the material expanded graphite expanded by heating of resistance to slag, can effectively play the loose effect that sticks to chill on slag removal device; Magnesia composition in the middle of barrier film is under hot conditions, become the periclase crystalline phase, fusing point is higher than 1750 ℃, can be as the isolated material that prevents that high temperature iron liquid and desulfurization slag from conducting heat to slag removal device, can either reduce the heat output of slag removal device, reduce the probability of slag removal device high temperature deformation, can slow down again slag removal device directly and iron liquid, desulfurization slag contact and cause the scaling loss of slag removal device, thereby improved slag removal device service life.The energy saving effect that the dead meal of this technology utilization production produces is worth using for reference and promotes, and shows technological progress.
The specific embodiment
The present invention is described further in conjunction with the embodiments.
The main one-tenth composition of the composition of the refining furnace waste residue of this process selection steel mill, conticaster tundish waste residue sees the following form.(unit is mass percent)
This technique take off slag operation: take 3 * 120 tons of converters as example;
1) with the discarded coating of tundish powder, refining furnace is discarded the white slag powder, petroleum coke powder mixes according to the ratio of mass percent 60:35:5, join in the JSD-2 pony mixer that good territory, Xinjiang machinery plant produces, add the water operation, add water for industrial use and industrial water all can, the mass percent of amount of water and mixed material amount is 3.5:1, and after mixing, the steel coal tub that is poured into an open topped is interior stand-by;
2) desulfurizing iron adopts blowing process desulfurization, slag removal device size (length) 0.3 m * (wide) 0.4 m * (height) 0.4m.
3) the granularity 0.9mm of the petroleum coke of buying, the granularity 2.5mm of the discarded coating of powder, the carrying volume of the steel coal tub of wherein selecting is 500kg;
4) the front son of skimming of skimming immerses 5min in the steel coal tub fill coating material, treat its adherent coating material 3cm, promote slag removal device, treat the dry 5min of its air cooling, until its surface during without obvious mud trickling, the operation beginning of skimming is at first to tumble 10 ° of ladle of Cinder Machine direction, in the direction bottom that ladle is tumbled, placing a volume is 11m
3Slag ladle, slag removal device is stretched to the ladle internal upper part, move from inside to outside along the scum interface, the desulfurization slag on iron liquid surface is clawed ladle enters slag ladle; Wherein the temperature of molten iron is controlled at 1230 or 1350 ℃, and wherein the heat resisting temperature of slag removal device is controlled at 800 ℃ or 900 ℃, extends its service life; The temperature of desulfurizing slag of hot metal is controlled at 1100 ℃ or 1200 ℃;
5) the adhesion slag iron of the sub-surface of skimming is removed in the end of job of at every turn skimming, and the son of again skimming immerses 5min in the steel coal tub, then promotes slag removal device, repeats the operation of front, recycles to get final product.
The present invention has effectively solved the desulfurizing iron short problem of sub-life-span of skimming, and with the optimized pattern of discarded object added value, steel-making waste residue is processed, for the protection remarkable benefit of environment; The cost that the making molten iron drossing is taken off son is 800 yuan, uses at most 32 heats, after adopting coating material, life-span is increased to more than 75 times, and namely the steel mill of daily output 100 stoves, save 1 every day and skim more than son, save per month cost more than 24000 yuan, the annual cost of saving is more than 280,000 yuan.
The JSD-2 type mixer of this process selection is produced by good territory, Xinjiang machinery plant; The full Pneumatic trolley walking type of QZB Cinder Machine becomes mechanical Co., Ltd to produce by the Shandong fine horse; HM-1 type petroleum coke coke powder is produced by the magnificent Science and Technology Ltd. in Xinjiang, and granularity is below 1mm.
Claims (1)
1. one kind is utilized steel-making waste residue as the technique of desulfurizing iron slag removal device coating material, it is characterized in that:
Take 3 * 120 tons of converters as example;
Coating material preparation: with the discarded coating of tundish powder, refining furnace is discarded the 60:35:5 mixing by mass percentage of white slag powder, petroleum coke powder, is placed in JSD-2 type mixer, adds water for industrial use or industrial water to mix, after mixing, pour in the steel coal tub stand-by; Wherein water and the compound that is placed in mixer by mass percentage 3.5:1 mix and get final product;
Use operation: desulfurizing iron is skimmed and is adopted the complete pneumatic Cinder Machine operation of QZB, and the son of skimming before skimming immerses adherent coating in the steel coal tub, when adherent coating thickness reaches 2.8-3.2cm, promotes slag removal device, naturally cold really with dry 5min, i.e. slag operation is taken off in enforcement; The temperature of wherein controlling desulfurizing slag of hot metal is 1100-1200 ℃, and the heat resisting temperature of slag removal device is 800-900 ℃;
Wherein the granularity of the discarded coating of powder used is less than 3mm, and the petroleum coke coke fines size is less than 1mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310067666.4A CN103170614B (en) | 2013-03-04 | 2013-03-04 | Process for using steel making waste slag as molten iron desulphurization slag-off plate coating materials |
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|---|---|---|---|
| CN201310067666.4A CN103170614B (en) | 2013-03-04 | 2013-03-04 | Process for using steel making waste slag as molten iron desulphurization slag-off plate coating materials |
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| CN103170614A true CN103170614A (en) | 2013-06-26 |
| CN103170614B CN103170614B (en) | 2015-04-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104588619A (en) * | 2014-12-15 | 2015-05-06 | 滁州金诺实业有限公司 | Cold iron block for aluminum alloy casting embedded pipe of vacuum casting household appliance mold |
| CN109320265A (en) * | 2018-10-11 | 2019-02-12 | 金湖县海瑞耐火材料厂 | A kind of fishing slag heat-resisting material and preparation method thereof |
| CN112457029A (en) * | 2020-12-08 | 2021-03-09 | 首钢集团有限公司 | Spray coating for slag pot grating and use method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104588619A (en) * | 2014-12-15 | 2015-05-06 | 滁州金诺实业有限公司 | Cold iron block for aluminum alloy casting embedded pipe of vacuum casting household appliance mold |
| CN104588619B (en) * | 2014-12-15 | 2016-06-01 | 滁州金诺实业有限公司 | Vacuum casting electronic appliance mold aluminum alloy casting buries effective frozen iron blocks in advance |
| CN109320265A (en) * | 2018-10-11 | 2019-02-12 | 金湖县海瑞耐火材料厂 | A kind of fishing slag heat-resisting material and preparation method thereof |
| CN109320265B (en) * | 2018-10-11 | 2022-02-18 | 金湖县海瑞耐火材料厂 | High-temperature-resistant material for slag fishing and preparation method thereof |
| CN112457029A (en) * | 2020-12-08 | 2021-03-09 | 首钢集团有限公司 | Spray coating for slag pot grating and use method thereof |
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| CN103170614B (en) | 2015-04-15 |
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