CN108220521A - Molten iron desiliconizing agent taking high-iron red mud as matrix and using method thereof - Google Patents
Molten iron desiliconizing agent taking high-iron red mud as matrix and using method thereof Download PDFInfo
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- CN108220521A CN108220521A CN201611142386.5A CN201611142386A CN108220521A CN 108220521 A CN108220521 A CN 108220521A CN 201611142386 A CN201611142386 A CN 201611142386A CN 108220521 A CN108220521 A CN 108220521A
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- iron
- red mud
- desiliconization
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- molten iron
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 76
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000011159 matrix material Substances 0.000 title claims abstract description 9
- 239000002893 slag Substances 0.000 claims abstract description 37
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000011777 magnesium Substances 0.000 claims abstract description 19
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000292 calcium oxide Substances 0.000 claims abstract description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 7
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 4
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 4
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 4
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000010079 rubber tapping Methods 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 40
- 239000002184 metal Substances 0.000 claims description 40
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 claims description 32
- 239000004615 ingredient Substances 0.000 claims description 14
- 238000005266 casting Methods 0.000 claims description 12
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 9
- 238000005453 pelletization Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 17
- 239000005864 Sulphur Substances 0.000 description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 229910052710 silicon Inorganic materials 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 239000010703 silicon Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000009628 steelmaking Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 238000006477 desulfuration reaction Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- 239000011574 phosphorus Substances 0.000 description 7
- 229910052698 phosphorus Inorganic materials 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- 239000007800 oxidant agent Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 4
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 229910001948 sodium oxide Inorganic materials 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000007885 magnetic separation Methods 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 230000002194 synthesizing effect Effects 0.000 description 3
- 238000004131 Bayer process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007787 solid Substances 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
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- JXBAVRIYDKLCOE-UHFFFAOYSA-N [C].[P] Chemical compound [C].[P] JXBAVRIYDKLCOE-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- -1 sinter Substances 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a molten iron desiliconization agent taking high-iron red mud as a matrix and a using method thereof, wherein the molten iron desiliconization agent comprises the following components in percentage by mass: 70-90% of high-iron red mud and 10-25% of magnesium slag, and controlling the binary alkalinity of the desiliconization agent to be 0.6-1.2; the high-iron red mud comprises the following components: fe2O335～55％，Al2O310～20％，Na25-15% of O and the balance of SiO2、TiO2CaO and impurities; the content of calcium oxide in the magnesium slag is more than or equal to 55 percent, the content of magnesium oxide is more than or equal to 6 percent, and the content of silicon dioxide is less than or equal to 35 percent. Before or during blast furnace tapping, adding the dried molten iron desiliconizing agent into the molten iron tank according to the addition of 20-40 kg/t of molten iron per ton of molten iron.
Description
Technical field
The invention belongs to field of steel metallurgy more particularly to a kind of as the desiliconization of hot metal agent of matrix and its made using iron red mud
Use method.
Background technology
Red mud is the solid waste that alumina producer production alumina process China and foreign countries incidentally generate, and generally often produces one ton
Aluminium oxide will generate 1~1.8 ton of red mud, and the heap in China in 2015 high-volume has reached more than 300,000,000 tons, and the storage of red mud is not only
It occupies a large amount of soil, pollution environment and there is serious security risks.In red mud in addition to containing Al, Fe, Si, also contain
There are a variety of rare and scatter elements such as a certain amount of Ga, Sc, In and Na2O, especially with outer row's red mud after alumina producing Bayer process,
Its iron content is generally between 30%~60%, thus to recycle value higher for this iron red mud, but due to iron red mud
Middle aluminium oxide and alkali metal content are high, fundamentally cannot be used conventional blast furnace ironmaking, at present in the industrial production still cannot be a large amount of
It utilizes.
Containing a large amount of CaO in reduced slag after magnesium's smelting (magnesium slag), also containing a certain amount of SiO2, MgO and Fe2O3.Its
Middle CaO, MgO and Fe2O3Advantageous to silicon removal pretreatment of molten iron, magnesium slag belongs to the industrial waste of magnesium metal manufacturing enterprise, often at present
It is handled using the method for being poured over wasteland or filling gully.Fine powder content is high in metal magnesium slag, and particle of the granularity less than 100 μm reaches
To more than 60, it be easy to cause air pollution.In addition, magnesium slag has strong alkalinity, easily make the salinization of soil.It is therefore desirable to
The metal magnesium slag for being is reasonably utilized.
Phosphorus is the harmful element in steel, therefore to be removed.The phosphorus content general control in steel exists in the conventional technology
0.010% hereinafter, the phosphorus content general control in some clean steels and special steel below 0.005%.To realize this target
Most of steel plant are removed the phosphorus in molten iron by the way of molten iron pretreatment.But dephosphorization of molten iron is oxidation process, to
During iron liquid oxygen blast or oxygen supply, therefore, before dephosphorization silicon wants first desiliconization, only silicon drops to centainly in molten iron prior to phosphorus oxidation
After level, phosphorus could be aoxidized significantly.
Desiliconization agent is to provide the material of oxygen source as host agent, to adjust basicity of slag, improve the flux of slag fluidity to be secondary
Agent.Desiliconization agent host agent is broadly divided into oxidant, and oxidant has solid oxidizer and gaseous oxidant.Solid oxidizer mainly has：
Iron ore, pellet, sinter, steel rolling iron sheet, steel-making dedusting dust, gaseous oxidant mainly have oxygen.Also add in addition to host agent
Enter a small amount of secondary agent, common pair agent mainly has lime, fluorite, CaO+CaF2、Na2CO3And converter slag etc..
There are mainly two types of modes for the desiliconization mode of molten iron, and one kind is can be in throwings such as blast furnace iron outlet groove, swing spout, hot-metal bottles
Desiliconization agent is spread, another increases special equipment and uses injection method in converter or hot-metal bottle etc..
In recent years, as people are to the pay attention to day by day of environmental protection, the processing and utilization of industrial waste are always development ring
One of difficult point of border close friend and circular economy, people constantly propose the new method that industrial waste recycles：
A kind of (the side of rotary hearth furnace direct-reduction iron red mud production Iron concentrate of Chinese Patent Application No. 201210275869.8
Method) a kind of method of rotary hearth furnace direct-reduction iron red mud production Iron concentrate is disclosed, step includes：1. iron red mud is carried out
It after drying and processing, carries out dispensing by a certain percentage with reducing agent, mix, pressure ball, green-ball is made；2. green-ball is put into rotary hearth furnace
It is restored, metallized pellet is made；3. cooled down, crushed to above-mentioned metallized pellet, magnetic separation and gravity treatment, iron essence is made
Powder.It is low through Iron concentrate iron content obtained by multi-stage magnetic separation that this method efficiently solves iron red mud in the prior art, Al2O3、Na2O content
The problem of high, present invention gained Iron concentrate quality meet steel plant's ingredient requirement, and efficient utilize for iron red mud provides outlet.
Chinese Patent Application No. 201210436465.2 is (a kind of to comprehensively utilize iron red mud with rotary hearth furnace pearl iron process
Method) method that discloses a kind of rotary hearth furnace pearl iron process comprehensive utilization iron red mud, it is related to extracting, being rich for iron in iron red mud
Collection and red mud recycling, it is characterised in that using iron red mud, carbonaceous reducing agent and additive be raw material, by dispensing,
Mixing and pelletizing, rotary hearth furnace reduction melt point, pearl iron and melting slag is made in broken, magnetic separation process.
Above-mentioned patent Shortcomings are, although above two method is all to select rotary hearth furnace as production equipment, although turning
Iron red mud can be effectively treated in bottom stove direct-reduction technique, recycle valuable element, but rotary hearth furnace production technology production cost
It is higher with cost of equipment maintenance, it is unfavorable for mass producing.
(a kind of iron red mud is used as the recycling of steelmaking slag agent/Dephosphorising agent to Chinese Patent Application No. 201410176170.5
Reuse method) disclose a kind of iron red mud be used as steelmaking slag agent/Dephosphorising agent recycling method, the present invention be by
Air-dry it is levigate after red mud and lime with 1:0.6~0.8 mass ratio mixing, for steelmaking slag agent/Dephosphorising agent, the patent
Only by it is levigate mixed to 200 lime and red mud now after, in the dry pot equipped with molten iron is poured into, in 1350~1400 DEG C of items
1 hour is kept the temperature together with molten iron under part, completes dephosphorization, silicon experiment, dephosphorization rate can reach more than 76%, and molten iron silicon content reduces
To 0.1%, the recycling to red mud is realized, but produced on-site process rhythm is fast, silicon removal pretreatment of molten iron and phosphorus process
(within the general 10min of overall process) and convertor steelmaking process (within the general 20min of the overall process) time that will seek quickness are short, the utilization
Red mud desiliconization and the method for dephosphorization, can not meet steel plant's production requirement.And the patent iron oxide content is low, it can not be shorter
Effective desiliconization is completed in time.
Chinese Patent Application No. 201310402154.9 (a kind of method of high temperature iron bath processing iron red mud) discloses one
The method of kind of the high temperature iron bath processing red mud of high ferro, by iron red mud, carbon raw material and additive according to additive 4%~
Fixed carbon phosphorus content in 10wt%, carbon raw material is rubbed with ferriferous oxide, the oxygen element of na oxide in iron red mud used
You mix than the ratio for C/O=1.1~1.4, and red mud agglomerate is made；The addition of , An≤50kg/t adds in during blast furnace casting
In molten iron, bathe environment using high temperature iron and molten iron impacts, stirring action makes the ferro element in red mud quickly restore, and recycles red mud
In iron.This method is simple and practicable, is not required to increase special device and equipment, realizes that iron, aluminium, alkali metal in iron red mud are high
Effect separation.Realize the efficient utilization of iron red mud.This method makes because adding a certain amount of carbonaceous material in dispensing in red mud
Iron oxide has higher iron recovery, but oxidisability is insufficient in red mud agglomerate, and silicon removal pretreatment of molten iron ability is low.And because
To add carbon dust in the pelletizing, the iron oxide and carbon vigorous reaction in molten iron be easy to causeing in pelletizing generate smog, influence
Operating environment.
Invention content
To overcome Shortcomings in above-mentioned patent and document, the technical problems to be solved by the invention are to provide one kind with red
Silicon removal pretreatment of molten iron agent and its application method of the mud for raw material preparation, while good desiliconization effect is reached, are fully returned
It receives using the iron resource in iron red mud, utilizes the iron oxide and Na of the high-content in iron red mud2O reduces desiliconization agent fusing point,
Make desiliconization agent rapid melting slagging, improve desilication efficiency and be conducive to environmental protection and waste recycling.
The present invention seeks to what is realized by following technical solution：
Containing higher sodium oxide molybdena and iron oxide in iron red mud, as desiliconization agent, advantage is as follows：Al in red mud2O3
And Na2O is good fluxing agent, helps to reduce the fusing point and viscosity of slag system, is conducive to slag sluicing system, improves desiliconization dynamics
Condition reduces the foamed slag height generated in desiliconization process, improves desilication efficiency.Na in red mud2O may be used also while desiliconization
With desulfurization.Polynary slag system is smelted, fusing point is lower, avoids CaF2Use, increase furnace life, reduce pollution.
This method through the following steps that realize：
It is a kind of using iron red mud as the desiliconization of hot metal agent of matrix, it is characterised in that by following components group by mass percentage
Into：Iron red mud 70%~90%, magnesium slag 10%~25%, between control desiliconization agent dual alkalinity 0.6~1.2；The high ferro
Red mud ingredient：Fe2O335~55%, Al2O310~20%, Na2O 5~15%, remaining ingredient are SiO2、TiO2, CaO and miscellaneous
Matter；Calcium oxide content >=55%, content of magnesia >=6% and dioxide-containing silica≤35% in the magnesium slag.
The iron red mud is the solid waste of alumina producing Bayer process, possesses higher sodium oxide molybdena and iron content,
Make it have higher oxidisability and basicity；
The desiliconization of hot metal agent is through briquetting or pelletizing by levigate red mud and magnesium slag, then is made after drying.
It is a kind of using iron red mud as the application method of the silicon removal pretreatment of molten iron agent of matrix：Before blast furnace casting or when tapping a blast furnace,
Dry desiliconization of hot metal agent is added to according to the addition of 20~40kg/t of molten iron per ton in hot-metal bottle, impacted using molten iron,
Stirring action carries out silicon removal pretreatment of molten iron and desulfurization, red mud roll into a ball iron oxide in the block also by quickly by the carbon in molten iron and silicon also
Original enters in molten iron and is recycled.Slag floats on molten iron surface after desiliconization, desulfurization, and being transported to steel-making work area desulfurization by normal operation takes off
It is focused on after slag.
Compared with prior art, outstanding feature of the invention is：
The desilication reaction time is abundant.Desilication method of the present invention completes desilication reaction when being using blast furnace casting, not shadow
Rhythm of production is rung, since the present big blast furnace casting time is long, the corresponding desilication reaction time is more sufficient, can reach higher
Desilication efficiency；
Small investment, strong operability.The potential energy stirring trough and hot-metal bottle of molten iron impact when the present invention utilizes blast furnace casting
Interior desiliconization agent completes desilication reaction, without additional investment equipment；
This can realize that iron resource in red mud and magnesium slag recycles clearly, reduce the accumulation of red mud and magnesium slag and right
The pollution of environment, while reached higher desiliconization and sulphur effect, desiliconization and sulphur cost are reduced, there is good economy and society
It can benefit；
Sodium oxide molybdena and aluminium oxide in red mud can be used as fluxing agent, improve desiliconization and sulphur agent burn-off rate, and slagging is fast, drop
Low slag viscosity, it is suppressed that the generation of foamed slag in desiliconization process, while make full use of the high-efficiency desulfurization of the sodium oxide molybdena in red mud
Performance increases desiliconization and sulphur efficiency；
1. desiliconization of the present invention/sulphur agent is free of CaF2, avoid erosions and F of the F to refractory material in Hot Metal Pretreatment
Pollution to environment.
1. blast furnace while desiliconization, has certain de- S efficiency.
Specific embodiment
It is illustrated with reference to specific embodiment：
Embodiment 1
Red mud ingredient is shown in Table 1.
1 red mud ingredient (wt, %) of table
The raw material proportioning for synthesizing de-/sulphur agent is as follows：The red mud of 80wt%, the magnesium slag of 20wt%.According to preceding method to red
Mud carries out agglomeration.
Desiliconization/sulphur agent ingredient is shown in Table 2
2 desiliconization of the present invention of table/sulphur agent proportion scheme (wt, %)
The desiliconization agent of blast furnace casting amount 3.5% is added in the hot-metal bottle after blast furnace iron outlet groove and steel-making work area select iron, so
The hot-metal bottle equipped with desiliconization agent is formulated to blast furnace discharge yard by normal operation afterwards, molten iron, high temperature iron are packed into when blast furnace casting
Water falls into the red mud agglomerate in impact stirring hot-metal bottle in hot-metal bottle, carries out quick desiliconization/sulphur.Chemistry is carried out to iron sample and slag specimen
Analysis, and finishing analysis is carried out to data, it is as a result as follows：Silicone content in molten iron is less than 0.15%, desulfuration efficiency 36.11%
Desiliconization/sulphuring treatment finishes after having gone out iron to blast furnace.Hot metal composition such as table 3 shows before and after desiliconization.
Hot metal composition variation (wt, %) before and after 3 desiliconization of hot metal of table
Embodiment 2
Red mud ingredient is shown in Table 4.
4 red mud ingredient (wt, %) of table
The raw material proportioning for synthesizing de-/sulphur agent is as follows：The red mud of 88wt%, the magnesium slag of 12wt%.According to preceding method to red
Mud carries out agglomeration.
Desiliconization/sulphur agent ingredient is shown in Table 5
5 desiliconization of the present invention of table/sulphur agent proportion scheme (wt, %)
The desiliconization agent of blast furnace casting amount 3.8% is added in the hot-metal bottle after blast furnace iron outlet groove and steel-making work area select iron, so
The hot-metal bottle equipped with desiliconization agent is formulated to blast furnace discharge yard by normal operation afterwards, molten iron, high temperature iron are packed into when blast furnace casting
Water falls into the red mud agglomerate in impact stirring hot-metal bottle in hot-metal bottle, carries out quick desiliconization/sulphur.Chemistry is carried out to iron sample and slag specimen
Analysis, and finishing analysis is carried out to data, it is as a result as follows：Silicone content in molten iron is less than 0.15%, desulfuration efficiency 36.58%
Desiliconization/sulphuring treatment finishes after having gone out iron to blast furnace.Hot metal composition such as table 6 shows before and after desiliconization.
Hot metal composition variation (wt, %) before and after 6 desiliconization of hot metal of table
Embodiment 3
Red mud ingredient is shown in Table 7.
7 red mud ingredient (wt, %) of table
The raw material proportioning for synthesizing de-/sulphur agent is as follows：The red mud of 88wt%, the magnesium slag of 15wt%.According to preceding method to red
Mud carries out agglomeration.
Desiliconization/sulphur agent ingredient is shown in Table 8
8 desiliconization of the present invention of table/sulphur agent proportion scheme (wt, %)
The desiliconization agent of blast furnace casting amount 4% is added in the hot-metal bottle after blast furnace iron outlet groove and steel-making work area select iron, then
The hot-metal bottle equipped with desiliconization agent is formulated to blast furnace discharge yard by normal operation, molten iron, high temperature liquid iron are packed into when blast furnace casting
The red mud agglomerate in impact stirring hot-metal bottle in hot-metal bottle is fallen into, carries out quick desiliconization/sulphur.Chemistry point is carried out to iron sample and slag specimen
Analysis, and finishing analysis is carried out to data, it is as a result as follows：Silicone content in molten iron is less than 0.15%, desulfuration efficiency 44.18%
Desiliconization/sulphuring treatment finishes after having gone out iron to blast furnace.Hot metal composition such as table 9 shows before and after desiliconization.
Hot metal composition variation (wt, %) before and after 9 desiliconization of hot metal of table
Claims (3)
- It is 1. a kind of using iron red mud as the desiliconization of hot metal agent of matrix, it is characterised in that：By percentage to the quality, desiliconization of hot metal agent group Part is iron red mud 70%~90%, magnesium slag 10%~25%；Between desiliconization of hot metal agent dual alkalinity 0.6~1.2；The high ferro Red mud ingredient：Fe2O335~55%, Al2O310~20%, Na2O 5~15%, remaining ingredient are SiO2、TiO2, CaO and miscellaneous Matter；Calcium oxide content >=55%, content of magnesia >=6% and dioxide-containing silica≤35% in the magnesium slag.
- It is 2. according to claim 1 using iron red mud as the desiliconization of hot metal agent of matrix, it is characterised in that：The desiliconization of hot metal Agent is through briquetting or pelletizing by levigate red mud and magnesium slag, then is made after drying.
- It is 3. a kind of according to claim 1 or 2 using iron red mud as the application method of the desiliconization of hot metal agent of matrix, feature It is：Before blast furnace casting or when tapping a blast furnace, dry desiliconization of hot metal agent is added according to the addition of 20~40kg/t of molten iron per ton Into hot-metal bottle.
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| CN110343803A (en) * | 2019-07-31 | 2019-10-18 | 西安建筑科技大学 | A kind of magnesium reduction slag is applied to the smelting process of pneumatic steelmaking |
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