CN117802283A - Ultra-high phosphorus molten iron double-slag dephosphorization method and dephosphorization device - Google Patents
Ultra-high phosphorus molten iron double-slag dephosphorization method and dephosphorization device Download PDFInfo
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- CN117802283A CN117802283A CN202410091989.5A CN202410091989A CN117802283A CN 117802283 A CN117802283 A CN 117802283A CN 202410091989 A CN202410091989 A CN 202410091989A CN 117802283 A CN117802283 A CN 117802283A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 261
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 128
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 109
- 239000011574 phosphorus Substances 0.000 title claims abstract description 108
- 239000002893 slag Substances 0.000 title claims abstract description 105
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 57
- 238000003723 Smelting Methods 0.000 claims abstract description 24
- 239000007921 spray Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 47
- 239000010959 steel Substances 0.000 claims description 47
- 229910005084 FexOy Inorganic materials 0.000 claims description 10
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 9
- 238000009628 steelmaking Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 17
- 238000006243 chemical reaction Methods 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000010079 rubber tapping Methods 0.000 abstract description 5
- 238000002347 injection Methods 0.000 abstract 2
- 239000007924 injection Substances 0.000 abstract 2
- 239000000292 calcium oxide Substances 0.000 description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000011575 calcium Substances 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 235000013980 iron oxide Nutrition 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- 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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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a dephosphorization method and a dephosphorization device of ultra-high phosphorus molten iron by a double slag method, wherein the dephosphorization device comprises the following steps: slag smelting furnace, tapping hole, dephosphorization package, dephosphorization platform truck, dephosphorization agent warehouse, spray gun, slag skimming machine, etc.; based on the characteristics of the ultra-high phosphorus molten iron, the method develops a special dephosphorizing agent, adopts a spray gun to carry out powder injection dephosphorization, and the dephosphorizing agent and the ultra-high phosphorus molten iron generate efficient dephosphorization chemical reaction in a dephosphorization ladle, and the process carries out two injection dephosphorization and slag skimming operations respectively, thereby providing a dephosphorization method which is technically reliable, economical and feasible for the ultra-high phosphorus molten iron to reach the standard; the high-efficiency dephosphorization and high-added-value utilization of the ultra-high-phosphorus molten iron can be realized, the dephosphorized molten iron can meet the phosphorus content requirement of the molten iron for converter smelting, and the dephosphorized slag obtained by treatment can be sold and utilized at high price, so that the method has remarkable technical and economic advantages.
Description
Technical Field
The invention relates to the technical field of dephosphorization of molten iron, in particular to a double-slag dephosphorization method and a dephosphorization device for ultra-high-phosphorus molten iron.
Background
The steel slag is produced by about 0.12 to 0.14 ton per 1 ton of steel, the recycling utilization rate is only about 30 percent, the problem of utilizing tailings exists in the treatment and utilization of the steel slag for a long time, the stack amount of newly added steel slag per year exceeds 8000 ten thousand tons, the accumulated stack amount exceeds 10 hundred million tons, a large amount of land, polluted water system, soil and the like are occupied, and the method has serious environmental safety hidden trouble.
The main chemical components of the steel slag are CaO and SiO 2 、FeO、Fe 2 O 3 And the like. The steel slag has the recycling value of two materials, namely iron and calcium silicate, in terms of chemical composition. In addition, the slag temperature of the steel slag exceeds 1600 ℃, and the calorific value of ton slag exceeds 50kg of standard coal, so that the method has great heat energy recovery value. In a word, the steel slag has 3 resource utilization values of iron, calcium silicate and heat energy. 5-10% of residual steel in the steel slag is usually partially recovered through grinding and magnetic separation, so that the obtained steel scraps and magnetic separation powder flow into a metallurgical flow, and nearly 80% of steel slag tailings still remain after main flow process treatment and cannot be used with high added value.
The molten steel slag is treated by adopting a direct reduction method, so that the waste heat resources of the steel slag at 1600 ℃ can be fully utilized, iron oxides in the steel slag are reduced into molten iron through a carbon-containing material, and the recycling of all iron resources in the steel slag is realized; the content of iron element in the tailings is reduced, the content of gelling active substances such as calcium silicate and the like is obviously improved, the activity of the steel tailings is greatly improved, the reduction modification for a long time promotes the digestion reaction of free calcium oxide, and the thorough stability treatment of steel slag is realized.
In the converter steelmaking process, phosphorus element in molten iron is converted into P through oxygen blowing smelting 2 O 5 Further combined with CaO in lime added to the converter to form Ca 3 PO 4 Gradually enriching the slag along with the smelting. In the direct reduction treatment process of the molten steel slag, ca in the steel slag is reduced into metallic iron along with iron oxide 3 PO 4 The transformation to P element also proceeds again to the iron phase under the reducing atmosphere. Therefore, the direct reduction of the molten steel slag inevitably causes the problem of exceeding the standard of phosphorus in molten iron. The phosphorus content of the common blast furnace molten iron is 0.08-0.16%, and the excessively high phosphorus element is unfavorable for controlling the narrow components of the steelmaking molten steel, so that the quality of steel grade is ensured. Iron obtained by direct reduction of molten steel slagThe content of phosphorus element in the water is often up to 1-2%, wherein the phosphorus element is too high, and belongs to ultra-high phosphorus molten iron, the ultra-high phosphorus molten iron can be mixed with common molten iron for steelmaking production after dephosphorization treatment, and the conventional dephosphorization process can not realize effective removal of phosphorus for the ultra-high phosphorus molten iron, so that the dephosphorized molten iron can not be directly used for converter smelting, and generally needs secondary smelting treatment and other operations, thereby increasing the complexity of the process and energy consumption and being incapable of realizing efficient treatment of the ultra-high phosphorus molten iron generated by steel slag smelting.
Disclosure of Invention
The technical purpose is that: aiming at the defects of the existing ultra-high phosphorus molten iron dephosphorization mode, the invention discloses an ultra-high phosphorus molten iron double-slag dephosphorization method and a dephosphorization device which can realize the efficient dephosphorization of ultra-high phosphorus molten iron after smelting is completed and can effectively meet the requirement of the phosphorus content of molten iron for converter smelting.
The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme:
a dephosphorization method of molten steel slag ultra-high phosphorus molten iron comprises the following steps:
s01, carrying out steel slag smelting to form ultra-high phosphorus molten iron;
s02, introducing the ultra-high-phosphorus molten iron into a dephosphorization package, adding a dephosphorization agent to dephosphorize the ultra-high-phosphorus molten iron in the dephosphorization package for the first time, and removing slag from dephosphorization slag generated by dephosphorization after dephosphorization;
s03, adding a dephosphorizing agent into the molten iron in the dephosphorizing bag again, performing secondary dephosphorization, and performing secondary slag skimming and cleaning on dephosphorization slag generated by the dephosphorization, so that the phosphorus content in the dephosphorized molten iron is reduced to the phosphorus content requirement of the molten iron for steelmaking production.
Preferably, in the step S02, the temperature of introducing the ultra-high phosphorus molten iron into the dephosphorization package is 1450-1650 ℃, and the introducing time is controlled to be 2-10 min.
Preferably, in step S02 and step S03, the dephosphorizing agent added comprises CaO, fexOy and CaF 2 Wherein the mass ratio of CaO is 30-45%, the mass ratio of FexOy is 40-65%, and CaF 2 The mass ratio is 3-12%.
Preferably, the present inventionThe CaO is lime, the FexOy is iron scale or iron ore powder, and the CaF is 2 Fluorite is selected.
Preferably, in the step S02 and the step S03, the content of the dephosphorizing agent added for the primary dephosphorizing and the secondary dephosphorizing is 6-12% of the mass of the ultra-high phosphorus molten iron.
Preferably, the dephosphorizing agent of the invention is added by using a spray gun, and the spray gun is used for spraying air flow to drive dephosphorizing agent powder into the ultra-high-phosphorus molten iron.
Preferably, the particle fineness of the dephosphorizing agent of the present invention is less than 20 mesh mass ratio exceeding 90%.
Preferably, the pressure of the compressed gas used by the spray gun is 0.5-1.5 mpa, the spraying time is 5-15 minutes, and the primary dephosphorization time is 10-20 minutes.
The invention also discloses a dephosphorization device based on the dephosphorization method, which comprises a slag smelting furnace for smelting steel slag into ultra-high-phosphorus molten iron, a dephosphorization bag for receiving the smelted ultra-high-phosphorus molten iron for dephosphorization, a pneumatic feeding mechanism for adding dephosphorization agent into the dephosphorization bag, and a slag removing machine for cleaning dephosphorization slag generated by dephosphorization, wherein the pneumatic feeding mechanism comprises a dephosphorization agent bin, a gas bag and a spray gun, the spray gun is arranged above the dephosphorization bag in a lifting manner, the gas bag is communicated with the dephosphorization agent bin and the spray gun through a gas pipe, and dephosphorization agent particles are fed into the ultra-high-phosphorus molten iron of the dephosphorization bag by using compressed gas.
Preferably, the dephosphorization package is arranged on the dephosphorization trolley, and the dephosphorization trolley drives the dephosphorization package to incline to one side where the slag removing machine is located when the dephosphorization slag removing treatment is carried out.
The beneficial effects are that: the ultra-high phosphorus molten iron double slag dephosphorization method and the dephosphorization device provided by the invention have the following beneficial effects:
1. according to the invention, the ultra-high phosphorus molten iron is dephosphorized efficiently by using a dephosphorization mode of a double slag method, and the requirement of the phosphorus content of the molten iron for converter smelting can be effectively met, so that the steel slag treatment process is simplified, the energy loss is reduced, and the comprehensive recycling of the steel slag is realized.
2. The invention controls the temperature and the introduction time of the ultra-high phosphorus molten iron into the dephosphorization package so as to ensure that the dephosphorization reaction effect can be maintained during dephosphorization, ensure the operation safety and reduce the energy consumption.
3. Dephosphorization agent CaO, fexOy, caF of the invention 2 Mixing, wherein FexOy is used for providing oxygen element for oxidation reaction of phosphorus element in molten iron to promote P 2 O 5 Simultaneously, the iron element in the iron oxide enters molten iron; caO is mainly used for P 2 O 5 Reaction to produce Ca 3 (PO 4 ) 2 ，CaF 2 The method is mainly used for reducing the melting point of the dephosphorizing agent, promoting the dephosphorizing agent to be quickly melted in molten iron and accelerating the reaction; p in the obtained dephosphorized slag 2 O 5 The method has the advantages that the method is high in yield, can be directly used as a raw material requirement for phosphorus chemical industry, directly realizes high added value utilization, does not generate secondary solid waste in the treatment process, can basically meet dephosphorization cost in the dephosphorization process, basically does not need economic investment in the treatment process, and reduces the treatment cost.
4. The dephosphorization agent adopts a powdery particle structure, is convenient for mixing and reacting with molten iron, and has the particle fineness of less than 20 meshes and the mass ratio of more than 90 percent, so that the dephosphorization agent can be gradually added into ultra-high phosphorus molten iron under the drive of compressed gas, the uniformity of the reaction is ensured, and meanwhile, the dephosphorization time is effectively controlled so as to carry out secondary dephosphorization subsequently.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic view of the dephosphorization device of the present invention;
wherein, 1-slag smelting furnace, 2-dephosphorization package, 3-dephosphorization agent, 4-dephosphorization sediment, 5-slag skimming machine, 6-dephosphorization agent storehouse, 7-gas package, 8-spray gun, 9-trachea, 10-super high phosphorus molten iron, 11-dephosphorization platform truck, 12-tapping hole.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown, but in which the invention is not so limited.
The invention discloses a dephosphorization method of molten steel slag ultra-high phosphorus molten iron, which comprises the following steps:
s01, carrying out steel slag smelting to form ultra-high phosphorus molten iron;
s02, introducing the ultra-high-phosphorus molten iron into a dephosphorization package, adding a dephosphorization agent to dephosphorize the ultra-high-phosphorus molten iron in the dephosphorization package for the first time, and removing slag from dephosphorization slag generated by dephosphorization after dephosphorization;
the temperature of introducing the ultra-high phosphorus molten iron into the dephosphorization package is 1450-1650 ℃, and the introducing time is controlled to be 2-10 min;
the tapping temperature is set to be a temperature range which mainly considers that the dephosphorization reaction is more reasonable, the temperature range is 1300-1400 ℃, if the temperature of molten iron is too low, dephosphorization agent is added to carry out primary dephosphorization, molten iron cooling can be solidified, secondary dephosphorization operation cannot be carried out, the situation of needing to be returned to the furnace can be caused, so that the dephosphorization process of the molten iron is influenced, and the energy consumption of a system is increased; if the temperature is too high, the temperature is still too high after adding the dephosphorizing agent, which is unfavorable for dephosphorizing reaction. The control of the introduction time mainly reduces the energy consumption in the molten iron transfer process, simultaneously avoids the safety problem caused by overlarge introduction flow, and reduces the difficulty and risk of field operation.
S03, adding a dephosphorizing agent into the molten iron in the dephosphorizing bag again, performing secondary dephosphorization, and performing secondary slag skimming and cleaning on dephosphorization slag generated by the dephosphorization, so that the phosphorus content in the dephosphorized molten iron is reduced to the phosphorus content requirement of the molten iron for steelmaking production.
According to the invention, dephosphorization operation in the ultra-high phosphorus molten iron is carried out by utilizing a twice dephosphorization and slag skimming mode, the phosphorus element in the molten iron obtained by reducing the steel slag is excessively high to 1-2%, the amount of the required dephosphorization agent is positively related to the phosphorus content, if all dephosphorization agents are added at one time, the one-time addition amount is excessively large, the temperature of the molten iron is excessively high at one time, so that the dephosphorization agent cannot be effectively and uniformly mixed with the ultra-high phosphorus molten iron, the dephosphorization effect is affected, the phosphorus content in the treated molten iron is often as high as 0.3-0.7%, and the dephosphorization cannot meet the target requirement that the phosphorus content in the molten iron for steel smelting is lower than 0.12% due to the influence of reaction time, mixing degree and back phosphorus even if the addition amount of the dephosphorization agent is increased.
In the invention, the primary dephosphorization and slag skimming are carried out firstly, so that the phosphorus content in the ultra-high phosphorus molten iron can be reduced, the phosphorus element in the phosphorus-rich slag is prevented from reentering the molten iron, the phenomenon of back phosphorus is prevented from occurring, and after the primary dephosphorization is finished, the dephosphorization agent is added again for secondary dephosphorization, thereby realizing the final dephosphorization target.
In the present invention in step S02 and step S03, the dephosphorizing agent added comprises CaO, fexOy and CaF 2 Wherein the mass ratio of CaO is 30-45%, the mass ratio of FexOy is 40-65%, and CaF 2 The mass ratio is 3-12%.
Preferably, the CaO of the invention preferably uses lime, fexOy is selected from iron scale or iron ore powder, caF 2 Fluorite is selected, wherein FexOy is used for providing oxygen element for oxidation reaction of phosphorus element in molten iron, and the reaction formula is 2 y/5P+FexOy=xFe+y/5P 2 O 5 Promote P 2 O 5 Simultaneously, the iron element in the iron oxide enters molten iron; caO is mainly used for P 2 O 5 Reaction to produce Ca 3 (PO 4 ) 2 The reaction is 3CaO+P 2 O 5 =Ca 3 (PO 4 ) 2 ；CaF 2 The method is mainly used for reducing the melting point of the dephosphorizing agent, promoting the dephosphorizing agent to be melted in molten iron rapidly and accelerating the reaction, and the content range mainly considers that the content is too low to have enough effect, the content is too high to increase the cost of the dephosphorizing agent and reduce the P in the phosphorus-rich slag of the follow-up dephosphorizing byproduct 2 O 5 Is contained in the composition. As can be seen from the above reaction, the main product after the dephosphorization agent is Ca 3 (PO 4 ) 2 And the phosphorus element in the molten iron is ultrahigh, the CaO and FexOy react thoroughly, and the P in the obtained phosphorus-rich slag 2 O 5 The method has the advantages that the method is high in cost, can be directly used as a raw material requirement for phosphorus chemical industry, directly realizes high added value utilization, does not generate secondary solid waste in the treatment process, and increases economic benefits due to the fact that iron elements in FexOy enter molten iron, and the benefits of the dephosphorization process basically can meet dephosphorization cost, and basically do not need economic investment in the treatment process.
In order to ensure the dephosphorization effect, the content of dephosphorization agents added for primary dephosphorization and secondary dephosphorization in the step S02 and the step S03 is 6-12% of the mass of the ultrahigh-phosphorus molten iron based on the phosphorus content of the ultrahigh-phosphorus molten iron.
Meanwhile, when the ultra-high-phosphorus molten iron is added into the dephosphorization ladle, the dephosphorization operation needs to be performed twice before and after, so that dephosphorization reaction time needs to be controlled while dephosphorization effect is ensured, so that the dephosphorization effect is not influenced by excessive temperature drop of the molten iron due to overlong primary dephosphorization time, and the phosphorus content in the final molten iron cannot reach the requirement of converter smelting.
Meanwhile, in order to facilitate the compressed gas to drive the dephosphorization agent to spray, the particle fineness of the dephosphorization agent is smaller than 20 meshes and the mass ratio exceeds 90%, so that the reaction time can be shortened, the treatment efficiency is improved, the pressure of the compressed gas used by the spray gun is 0.5-1.5 mpa, the spraying time is 5-15 minutes, and the primary dephosphorization time is controlled to be 10-20 minutes.
As shown in fig. 1, the invention also discloses a dephosphorization device based on the dephosphorization method, which comprises a slag smelting furnace 1 for smelting steel slag into ultra-high-phosphorus molten iron 10, a dephosphorization ladle 2 for receiving the smelted ultra-high-phosphorus molten iron for dephosphorization, a pneumatic feeding mechanism for adding a dephosphorization agent 3 into the dephosphorization ladle 2, and a slag removing machine 5 for cleaning dephosphorization slag 4 generated by dephosphorization, wherein a tapping hole 12 is arranged at the lower part of the slag smelting furnace 1, and the ultra-high-phosphorus molten iron 10 flows into the dephosphorization ladle 2 from the tapping hole 12 at the bottom of the slag smelting furnace 1 at a certain rate; the pneumatic feeding mechanism comprises a dephosphorization agent bin 6, an air bag 7 and a spray gun 8, wherein the spray gun 8 is arranged above the dephosphorization bag 2 in a lifting manner, the air bag 7 is communicated with the dephosphorization agent bin 6 and the spray gun 8 through an air pipe 9, and the granules of the dephosphorization agent 3 are sent into ultra-high phosphorus molten iron 10 of the dephosphorization bag 2 by using compressed gas.
When the ultra-high phosphorus molten iron dephosphorization is carried out, a large amount of dephosphorization agent is required to be sprayed into the dephosphorization package, so that the dephosphorization package is at least provided with a space with the remaining total height of 30% besides the volume capacity of the molten iron, so that enough space is provided for adding the dephosphorization agent to prevent the molten iron added with the dephosphorization agent and the dephosphorization agent from overflowing from the dephosphorization package. Therefore, if a slag removing process is performed, the conventional slag removing device usually adopts a translational slag removing operation, the dephosphorizing ladle is required to be inclined to enable the position of the phosphorus-rich slag to be flush with or higher than the outer edge of the dephosphorizing ladle, so that the slag removing operation is smooth, and in order to facilitate the slag removing process, the dephosphorizing ladle 2 is arranged on the dephosphorizing trolley 11, and when the dephosphorizing slag 4 is subjected to the slag removing process, the dephosphorizing trolley 11 drives the dephosphorizing ladle 2 to incline to one side of the slag removing machine 5, so that the slag removing machine 5 can complete slag removing operation within a certain time, and after the slag removing operation is completed, the dephosphorizing ladle 2 is driven to reset by the dephosphorizing trolley 11, the inclination angle of the dephosphorizing ladle 2 is preferably 0-60 degrees, and the slag removing operation time is 2-6 minutes each time.
The following table is data of dephosphorization of ultra-high phosphorus molten iron based on the dephosphorization device and the dephosphorization method of the invention:
table-data table for dephosphorization treatment of ultra-high phosphorus molten iron with different phosphorus contents
According to the invention, the temperature of molten iron in the dephosphorization ladle after primary dephosphorization is 1380-1480 ℃, and the temperature of molten iron in the dephosphorization ladle after secondary dephosphorization is 1300-1400 ℃. The mass ratio of the initial phosphorus element in the general ultra-high phosphorus molten iron is 0.8-2.4%, and according to the table, the dephosphorization rate of the ultra-high phosphorus molten iron exceeds 90%, the phosphorus element in the dephosphorized molten iron is reduced to 0.04-0.12%, the phosphorus content requirement of the steelmaking molten iron is met, and the dephosphorization molten iron can be directly returned to steelmaking production as a raw material; p in dephosphorization slag obtained by twice slag skimming 2 O 5 The content is 18-40%, and P in the phosphorite standard can be completely met 2 O 5 The content is required. The dephosphorization slag 12 is taken as a production raw material to be sold in the phosphorus chemical industry after being crushed, magnetically separated and deironized, so that high-added-value utilization is realized, and high-efficiency dephosphorization treatment in ultra-high-phosphorus molten iron is realized, so that the dephosphorization slag can be used as a steel enterpriseThe high-efficiency recycling of industrial steel slag provides a key technical support.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (10)
1. The dephosphorization method of the molten steel slag ultra-high phosphorus molten iron is characterized by comprising the following steps:
s01, carrying out steel slag smelting to form ultra-high phosphorus molten iron;
s02, introducing the ultra-high-phosphorus molten iron into a dephosphorization package, adding a dephosphorization agent to dephosphorize the ultra-high-phosphorus molten iron in the dephosphorization package for the first time, and removing slag from dephosphorization slag generated by dephosphorization after dephosphorization;
s03, adding a dephosphorizing agent into the molten iron in the dephosphorizing bag again, performing secondary dephosphorization, and performing secondary slag skimming and cleaning on dephosphorization slag generated by the dephosphorization, so that the phosphorus content in the dephosphorized molten iron is reduced to the phosphorus content requirement of the molten iron for steelmaking production.
2. The dephosphorization method of molten steel slag ultra-high phosphorus molten iron according to claim 1, wherein in step S02, the temperature of introducing the ultra-high phosphorus molten iron into the dephosphorization package is 1450-1650 ℃, and the introduction time is controlled to be 2-10 min.
3. The dephosphorization method of ultra-high phosphorus molten iron of molten steel slag as claimed in claim 1, wherein in the steps S02 and S03, the dephosphorizing agent added comprises CaO, fexOy and CaF 2 Wherein the mass ratio of CaO is 30-45%, the mass ratio of FexOy is 40-65%, and CaF 2 The mass ratio is 3-12%.
4. The dephosphorization method of the ultra-high phosphorus molten iron of the molten steel slag as claimed in claim 3, wherein the CaO is lime, the FexOy is iron scale or iron ore powder and CaF 2 Fluorite is selected.
5. The dephosphorization method of the ultra-high phosphorus molten iron of the molten steel slag according to claim 3, wherein in the step S02 and the step S03, the content of the dephosphorization agent added for the primary dephosphorization and the secondary dephosphorization is 6-12% of the mass of the ultra-high phosphorus molten iron.
6. A method for dephosphorizing ultra-high phosphorus molten iron from molten steel slag according to claim 3, wherein said dephosphorizing agent is added by spraying with a spray gun, and the spray gun is used to spray the flow of the dephosphorizing agent to drive the powder of the dephosphorizing agent into the ultra-high phosphorus molten iron.
7. The dephosphorization method of molten steel slag ultra-high phosphorus molten iron according to claim 6, wherein the particle fineness of the dephosphorizing agent is less than 20 meshes and the mass ratio is more than 90%.
8. The dephosphorization method of the ultra-high phosphorus molten iron of the molten steel slag, according to claim 7, is characterized in that the pressure of compressed gas used by a spray gun is 0.5-1.5 mpa, the spraying time is 5-15 minutes, and the primary dephosphorization time is 10-20 minutes.
9. Dephosphorization device for realizing the dephosphorization method of any one of claims 1-8, characterized by comprising a slag smelting furnace (1) for smelting steel slag into ultra-high-phosphorus molten iron (10), a dephosphorization bag (2) for receiving the smelted ultra-high-phosphorus molten iron for dephosphorization treatment, a pneumatic feeding mechanism for adding dephosphorization agent (3) into the dephosphorization bag (2) and a slag removing machine (5) for cleaning dephosphorization slag (4) generated by dephosphorization, wherein the pneumatic feeding mechanism comprises a dephosphorization agent bin (6), an air bag (7) and a spray gun (8), the spray gun (8) is arranged above the dephosphorization bag (2) in a lifting manner, the air bag (7) is communicated with the spray gun (8) through an air pipe (9), and granules of the dephosphorization agent (3) are fed into the ultra-high-phosphorus molten iron (10) of the dephosphorization bag (2) by using compressed gas.
10. The dephosphorization device according to claim 9, wherein the dephosphorization package (2) is arranged on a dephosphorization trolley (11), and the dephosphorization package (2) is driven to incline to the side of the slag removing machine (5) by the dephosphorization trolley (11) when the slag removing treatment of the dephosphorization slag (4) is carried out.
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