CN102000797A - Method for producing nodular cast iron pipe fittings with vanadium-bearing titanomagnetite as raw material - Google Patents
Method for producing nodular cast iron pipe fittings with vanadium-bearing titanomagnetite as raw material Download PDFInfo
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- CN102000797A CN102000797A CN2009101700999A CN200910170099A CN102000797A CN 102000797 A CN102000797 A CN 102000797A CN 2009101700999 A CN2009101700999 A CN 2009101700999A CN 200910170099 A CN200910170099 A CN 200910170099A CN 102000797 A CN102000797 A CN 102000797A
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Abstract
The invention relates to a method for producing nodular cast iron pipe fittings with vanadium-bearing titanomagnetite as a raw material, comprising the steps of: smelting the raw materials of the vanadium-bearing titanomagnetite into vanadium-bearing liquid iron according to an iron manufacture process, transferring the vanadium -bearing liquid iron into an oxygen-blown converter and carrying out three removal treatment (desilicication, dephosphorization and desulfurization) for producing semisteel liquid iron, heating the semisteel liquid iron under oxygen blowing to reach a nodulizing inoculation temperature, transferring the semisteel liquid iron meeting the nodulizing inoculation conditions into a spheroidizing ladle and carrying out spheroidizing inoculation treatment to produce cast tube liquid iron, and injecting the cast tube liquid iron into centrifugal pipe casting equipment to produce the nodular cast iron pipe fittings, wherein the injection temperature of the cast tube iron liquid iron is 1,400-1,420 DEG C, and in the cast tube liquid iron, the vanadium content is not larger than 0.02%, the phosphorus content is not larger than 0.08%, and the sulfur content is not larger than 0.02%.
Description
Technical field
The present invention relates to a kind of is the method that raw material is produced nodular cast iron pipe fittings with the vanadium titano-magnetite, the vanadium titano-magnetite raw material is smelted into vanadium-bearing hot metal according to iron-smelting process, vanadium-bearing hot metal changes over to and carries out three in the oxygen-blown converter and take off and handle to generate vanadium extraction half steel molten iron, the half steel molten iron that will reach the spheroidization and inoculation condition changes the nodularization bag over to and carries out the spheroidization and inoculation processing, generate cast tube iron liquid, described cast tube iron liquid is injected spun cast pipe equipment generate nodular cast iron pipe fittings.
Background technology
Chinese patent 01107155.9 discloses a kind of centrifugal cast high-antiwear pipe production method, be characterized in smelting: with steel scrap and alloy is primary raw material, adopt 0.5-3.0t electric arc furnaces or the melting of 0.25-0.5t intermediate frequency furnace, repeatedly carry out on-the-spot sample analysis (for example: chemical method or direct-reading spectrometer) in the melting, the result adjusts molten steel composition according to on-the-spot sample analysis, come out of the stove after molten steel composition meets the material composition, the molten steel tapping temperature is 1500-1650 ℃; The preparation of type tube: type tube toasts earlier when using for the first time, then the type tube inner surface is sprayed quartz or zirconium English coating, after the spraying, inner surface is toasted again; Spun casting: on centrifuge, place type tube, with molten steel casting moulding in type tube through the baking spraying; The demoulding: when the cast tube inner wall temperature drops to 400-800 ℃, (determine) the parking demoulding, cast tube is separated with type tube according to the different materials prescription; Adopt spun cast pipe of the present invention, have the metallographic structure of high-wearing feature energy; Adopt the inventive method, production technology is brief, and the cast tube of production does not ftracture, is out of shape little, centrifugal casting technique can be produced the cast tube of thin-walled (for example: 8mm is thick), pipe two ends wall thickness good uniformity, dense structure, do not have and loosen, field trash is few, thereby improves the mechanical property of cast tube; As the pipeline of conveying solid substance particle and slurry, abrasion resistance obviously improves, and improve 3-6 doubly than 16Mn welded tube service life.But this patent is a primary raw material with steel scrap and alloy only, can not be that raw material is produced nodular cast iron pipe fittings with the vanadium titano-magnetite.Therefore, being necessary to propose a kind of is the method that raw material is produced nodular cast iron pipe fittings with the vanadium titano-magnetite.
Summary of the invention
The object of the present invention is to provide a kind of is the method that raw material is produced nodular cast iron pipe fittings with the vanadium titano-magnetite, the vanadium titano-magnetite raw material is smelted into vanadium-bearing hot metal according to iron-smelting process, vanadium-bearing hot metal changes over to and carries out three in the oxygen-blown converter and take off and handle to generate the half steel molten iron, the vanadium extraction half steel molten iron that will reach the spheroidization and inoculation condition changes the nodularization bag over to and carries out the spheroidization and inoculation processing, generate cast tube iron liquid, described cast tube iron liquid is injected spun cast pipe equipment generate nodular cast iron pipe fittings.The present invention rationally utilizes the v-ti magnetite ore resources, reaches most optimum distribution of resources, and floor space is little, and technological process is short, economizes on resources and the energy.
The objective of the invention is to be realized by following technical proposals: a kind of is the method that raw material is produced nodular cast iron pipe fittings with the vanadium titano-magnetite, it is characterized in that the step of described method is:
A, the vanadium titano-magnetite raw material is smelted into vanadium-bearing hot metal according to iron-smelting process, the weight ratio of v element, titanium elements, ferro element is 0.2-5: 0.1-15: 35-40 in the described v-ti magnetite mineral aggregate;
B, vanadium-bearing hot metal sent in the desulfurization preliminary treatment stove add desulfurizing agent and carry out the desulfurization preliminary treatment, pretreated vanadium-bearing hot metal changes over to and carries out three in the oxygen-blown converter and take off to handle and generate the half steel molten iron, adds vanadium extraction and go into slag auxiliary material CaO, SiO in described vanadium-bearing hot metal
2, CaC
2, heating by O2 blowing carries out vanadium extraction and handles; Add Dephosphorising agent in described vanadium-bearing hot metal, heating by O2 blowing carries out dephosphorization treatment, adds desulfurizing agent and carry out the desulfurization processing in described vanadium-bearing hot metal;
C, described half steel molten iron heating by O2 blowing is reached the spheroidization and inoculation temperature, add auxiliary material the carbon content in the half steel molten iron is controlled in the 3.5%-3.8% scope;
D, change the described half steel molten iron that reaches the spheroidization and inoculation condition over to the nodularization bag and carry out spheroidization and inoculation and handle, generate cast tube iron liquid, add nodulizer, inovulant in the nodularization bag, described nodulizer is a rare earth ferrosilicomagnesium, its part by weight is 1.6%-2.0%, described inovulant is FeSi75, and its part by weight is 0.8%-1.0%; Described spheroidization treatment temperature is 1420 ℃-1450 ℃; The aluminiferous amount is not more than 0.02% in the described cast tube iron liquid, and phosphorus content is not more than 0.08%, and sulfur content is not more than 0.02%;
E, described cast tube iron liquid is injected spun cast pipe equipment generate nodular cast iron pipe fittings, cast tube iron liquid implantation temperature is 1400 ℃-1420 ℃.
Compared with the prior art the present invention has following advantage:
1, produces nodular cast iron pipe fittings because the present invention is raw material with the vanadium titano-magnetite, have and rationally utilize the v-ti magnetite ore resources, reach the characteristics of most optimum distribution of resources.
2, because the present invention adopts abbreviated system, and technology is controlled flexibly, equipment is few, invests little.
3, because floor space of the present invention is little, technological process is short, economizes on resources and the energy, brings better economic benefit and social benefit to enterprise.
4, the present invention can utilize existing small furnace, avoids overlapping construction.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1, process flow diagram of the present invention
The specific embodiment
Embodiment one:
Referring to Fig. 1, of the present invention is the method that raw material is produced nodular cast iron pipe fittings with the vanadium titano-magnetite, and the step of described method is:
A, the vanadium titano-magnetite raw material is smelted into vanadium-bearing hot metal according to iron-smelting process, the weight ratio of v element, titanium elements, ferro element is 0.2-5: 0.1-15: 35-40 in the described v-ti magnetite mineral aggregate; Generally, the alum Ti content is less than 20% in the vanadium titano-magnetite raw material, iron content 35%-40%, raw material enters blast furnace through screening (magnetic separation) back with the batch mixes proportioning and smelts, by controlling to the control of raw material and in smelting blast furnace being carried out hand work, make the vanadium-bearing hot metal impurity element of its smelting few, the quality height;
B, vanadium-bearing hot metal sent in the desulfurization preliminary treatment stove add desulfurizing agent CaO, CaF
2Carry out the desulfurization preliminary treatment, pretreated vanadium-bearing hot metal changes over to and carries out three in the oxygen-blown converter and take off and handle to generate the half steel molten iron, adds vanadium extraction and go into slag auxiliary material CaO, SiO in described vanadium-bearing hot metal
2, CaC
2, heating by O2 blowing is carried alum and is handled; Add Dephosphorising agent CaO in described vanadium-bearing hot metal, heating by O2 blowing carries out dephosphorization treatment, adds desulfurizing agent and carry out the desulfurization processing in described vanadium-bearing hot metal; Generally, use hot-metal ladle and carriage that vanadium-bearing hot metal is transported to desulfurization preliminary treatment stove (being also referred to as KR), in the transportation, add magnesium (Mg), CaC in the vanadium-bearing hot metal
2Remove impurity such as part sulphur, phosphorus Deng auxiliary material; Carry out three take off processing before, at first vanadium-bearing hot metal is carried out thermometric sampling, understand the content of each elemental composition in the vanadium-bearing hot metal, and in processing procedure, control; When proposing the alum processing, described molten iron temperature is controlled at 1350 ℃-1400 ℃, and course of reaction is: V+O
2→ V
2O
5V
2O
5Go into slag; During dephosphorization treatment, described molten iron temperature is controlled at 1250 ℃-1350 ℃, and course of reaction is: FeO+P+CaO → Fe+CaPO
4, CaPO
4Go into slag, described Dephosphorising agent is CaO; When desulfurization was handled, described desulfurizing agent was CaO, CaF
2, CaC
2, described molten iron temperature is controlled at 1130 ℃-1180 ℃, and course of reaction is: C+S+CaO → CaS+CO (desulfurization), CaO+S+Si → CaS+Ca
2SiO
4(desulfurization, desiliconization), CaC
2+ S → CaS+C graphite (desulfurization), CaS goes into slag;
C, described half steel molten iron heating by O2 blowing is reached the spheroidization and inoculation temperature, add auxiliary material the carbon content in the half steel molten iron is controlled in the 3.5%-3.8% scope; Need in the smelting process in the sampling of time point thermometric the strict control of technology, each composition is regulated, continue to promote temperature to reach the spheroidization and inoculation temperature by transforming the valve oxygen blast in blowing, tapping temperature is controlled at 1490 ℃-1510 ℃, adds an amount of carbon line at last and guarantees to remove unnecessary oxygen;
D, change the described half steel molten iron that reaches the spheroidization and inoculation condition over to the nodularization bag and carry out spheroidization and inoculation and handle, generate cast tube iron liquid, add nodulizer, inovulant in the nodularization bag, described nodulizer is a rare earth ferrosilicomagnesium, its part by weight is 1.6%-2.0%, described inovulant is FeSi75, and its part by weight is 0.8%-1.0%; Described spheroidization treatment temperature is 1420 ℃-1450 ℃; Vanadium content is not more than 0.02% in the described cast tube iron liquid, and phosphorus content is not more than 0.08%, and sulfur content is not more than 0.02%; It is to pour method to handle that described spheroidization and inoculation is handled, the spheroidization and inoculation processing time is 10 minutes, the described method processing sequence that pours is to add nodulizer, inovulant in the nodularization bag in advance in proportion, cover the iron filings layer on described nodulizer, the inovulant, described half steel molten iron is injected in the nodularization bag from top to bottom; Described vanadium extraction half steel molten iron temperature is 1490 ℃-1510 ℃, and preferred temperature is 1500 ℃.
E, described cast tube iron liquid is injected spun cast pipe equipment generate nodular cast iron pipe fittings, cast tube iron liquid implantation temperature is 1400 ℃-1420 ℃.The process that cast tube iron liquid in the described nodularization bag all injects spun cast pipe equipment is not more than 15 minutes.
Among the present invention, the important step that method inoculation process is a ball milling cast tube production process is poured in employing, it not only promotes graphitization, prevent that free cementite and spoken parts in traditional operas from occurring, and help nodularization, and make graphite become more tiny, more rounding, be more evenly distributed, thereby improve the mechanical property of nodular cast iron pipe fitting.Its main operating process is that nodulizer and the inovulant that will prepare join in the nodularization bag in advance, and covers one deck iron filings in the above.Iron liquid carries out pouring into a mould in 15 minutes after the nodularization and finishes, and prevents decaying spheroidisation,
Among the present invention, utilize vanadium titano-magnetite to smelt the cast tube technology and behind vanadium extraction by converter blowing, stay a spot of vanadium for raw material, can increase the intensity and the wearability of cast tube, make micro-total content (comprising vanadium, titanium and other trace element) by technology controlling and process but be no more than 0.1% production high-quality ductile iron pipe; The ratio of the ratio of each element that relates among the present invention, the ratio of additive, auxiliary material all is weight percentage.
Among the present invention, blast furnace, desulfurization preliminary treatment stove (being also referred to as KR), hot-metal ladle and carriage, oxygen-blown converter, nodularization bag, spun cast pipe equipment all belong to conventional equipment, be not described in detail, relate to the temperature survey of smelting molten iron, half steel molten iron in the described production process, the measurement of chemical composition all belongs to the prior art category, is not described in detail.
Claims (4)
1. one kind is the method that raw material is produced nodular cast iron pipe fittings with the vanadium titano-magnetite, it is characterized in that the step of described method is:
A, the vanadium titano-magnetite raw material is smelted into vanadium-bearing hot metal according to iron-smelting process, the weight ratio of v element, titanium elements, ferro element is 0.2-5: 0.1-15: 35-40 in the described v-ti magnetite mineral aggregate;
B, vanadium-bearing hot metal sent in the desulfurization preliminary treatment stove add desulfurizing agent and carry out the desulfurization preliminary treatment, pretreated vanadium-bearing hot metal changes over to and carries out three in the oxygen-blown converter and take off to handle and generate the half steel molten iron, adds vanadium extraction and go into slag auxiliary material CaO, SiO in described vanadium-bearing hot metal
2, CaC
2, heating by O2 blowing is carried alum and is handled; Add Dephosphorising agent in described vanadium-bearing hot metal, heating by O2 blowing carries out dephosphorization treatment, adds desulfurizing agent and carry out the desulfurization processing in described vanadium-bearing hot metal;
C, described half steel molten iron heating by O2 blowing is reached the spheroidization and inoculation temperature, add auxiliary material the carbon content in the half steel molten iron is controlled in the 3.5%-3.8% scope;
D, change the described vanadium extraction half steel molten iron that reaches the spheroidization and inoculation condition over to the nodularization bag and carry out spheroidization and inoculation and handle, generate cast tube iron liquid, add nodulizer, inovulant in the nodularization bag, described nodulizer is a rare earth ferrosilicomagnesium, its part by weight is 1.6%-2.0%, described inovulant is FeSi75, and its part by weight is 0.8%-1.0%; Described spheroidization treatment temperature is 1420 ℃-1450 ℃; Vanadium content is not more than 0.02% in the described cast tube iron liquid, and phosphorus content is not more than 0.08%, and sulfur content is not more than 0.02%;
E, described cast tube iron liquid is injected spun cast pipe equipment generate nodular cast iron pipe fittings, cast tube iron liquid implantation temperature is 1400 ℃-1420 ℃.
2. the method for production nodular cast iron pipe fittings according to claim 1 is characterized in that: described desulfurizing agent is CaO, CaF
2, CaC
2, described Dephosphorising agent is CaO.
3. the method for production nodular cast iron pipe fittings according to claim 2, it is characterized in that: it is to pour method to handle that described spheroidization and inoculation is handled, the spheroidization and inoculation processing time is 10 minutes, the described method processing sequence that pours is to add nodulizer, inovulant in the nodularization bag in advance in proportion, cover the iron filings layer on described nodulizer, the inovulant, described half steel molten iron is injected in the nodularization bag from top to bottom; Described half steel molten iron temperature is 1490 ℃-1510 ℃.
4. the method for production nodular cast iron pipe fittings according to claim 3 is characterized in that: the process that the cast tube iron liquid in the described nodularization bag all injects spun cast pipe equipment is not more than 15 minutes.
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| CN200910170099A CN102000797B (en) | 2009-09-03 | 2009-09-03 | Method for producing nodular cast iron pipe fittings with vanadium-bearing titanomagnetite as raw material |
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| CN200910170099A CN102000797B (en) | 2009-09-03 | 2009-09-03 | Method for producing nodular cast iron pipe fittings with vanadium-bearing titanomagnetite as raw material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480380A (en) * | 2015-01-23 | 2015-04-01 | 四川省川建管道有限公司 | Forming process suitable for preparing water-cooling metal mold centrifugal nodular cast iron pipe |
| CN112981222A (en) * | 2021-02-09 | 2021-06-18 | 辽阳钢铁有限公司 | Method for improving purity of molten iron in nodular cast iron smelting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2625226B1 (en) * | 1987-12-23 | 1990-06-08 | Chavanne Ketin | BIMETALLIC COMPOSITE WORKING CYLINDER |
| CN1119425C (en) * | 2001-02-21 | 2003-08-27 | 四川恒宏科技钢管有限公司 | Centrifugal cast high-antiwear pipe and its production method |
| CN101328523B (en) * | 2008-07-22 | 2011-03-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Ladle top-bottom blowing vanadium extracting method |
-
2009
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480380A (en) * | 2015-01-23 | 2015-04-01 | 四川省川建管道有限公司 | Forming process suitable for preparing water-cooling metal mold centrifugal nodular cast iron pipe |
| CN104480380B (en) * | 2015-01-23 | 2016-06-29 | 四川省川建管道有限公司 | A kind of moulding process being applicable to prepare water-cooling metal centrifugal ductile iron pipe |
| CN112981222A (en) * | 2021-02-09 | 2021-06-18 | 辽阳钢铁有限公司 | Method for improving purity of molten iron in nodular cast iron smelting |
| CN112981222B (en) * | 2021-02-09 | 2022-01-18 | 辽阳钢铁有限公司 | Method for improving purity of molten iron in nodular cast iron smelting |
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