CN113337774B - Silicon oxide inoculation nodular cast iron technology - Google Patents
Silicon oxide inoculation nodular cast iron technology Download PDFInfo
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- CN113337774B CN113337774B CN202010138797.7A CN202010138797A CN113337774B CN 113337774 B CN113337774 B CN 113337774B CN 202010138797 A CN202010138797 A CN 202010138797A CN 113337774 B CN113337774 B CN 113337774B
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- iron
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- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000011081 inoculation Methods 0.000 title claims abstract description 15
- 229910052814 silicon oxide Inorganic materials 0.000 title claims abstract description 12
- 238000005516 engineering process Methods 0.000 title description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910052742 iron Inorganic materials 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 28
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 9
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 229910000805 Pig iron Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 2
- 230000007306 turnover Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 8
- 239000010439 graphite Substances 0.000 description 8
- 239000002054 inoculum Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052917 strontium silicate Inorganic materials 0.000 description 1
- QSQXISIULMTHLV-UHFFFAOYSA-N strontium;dioxido(oxo)silane Chemical compound [Sr+2].[O-][Si]([O-])=O QSQXISIULMTHLV-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- 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
- C21C1/10—Making spheroidal graphite cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a silicon oxide inoculation nodular cast iron process, which comprises the following specific steps: firstly, sequentially adding a layer of nodulizer and a layer of covering agent into a pit of a ladle from bottom to top; firstly, adding a ferrosilicon block into a part of a ladle above a covering agent; pouring molten iron, pouring along with the molten iron, and adding the ferrosilicon block again. The process adopted by the invention is simple to operate and easy to implement, and can obviously improve the inoculation effect of ductile iron and greatly improve the quality of ductile iron.
Description
Technical Field
The invention belongs to the technical field of spheroidal graphite cast iron production, and particularly relates to a silicon oxide inoculation spheroidal graphite cast iron process.
Background
In the existing process for producing spheroidal graphite cast iron, expensive inoculation materials are mostly adopted for obtaining spherical graphite with round morphology; alloying a plurality of noble metals with silicon; such as strontium silicate, zirconium silicate, lanthanum silicate inoculants, etc., are added to molten iron containing magnesium to obtain morphologically rounded spheroidal graphite. In the prior art, although (silicate SiO 2) of oxide generated by oxidizing silicon on the surface of molten iron is used as a transition layer for graphite ball growth in spheroidal graphite cast iron, the silicate SiO2 has good matching degree with graphite, and spherical graphite with round morphology is easier to obtain in the process of producing spheroidal graphite cast iron. However, in the existing technology, silicon blocks are arranged above the nodulizer, and steel plates are arranged on the silicon blocks, so that the generation of silicate is affected, and the nodulizing rate can not meet the secondary requirement all the time. At present, most of the adopted solutions are to add other mixture to generate silicate, so that the process is complex, and meanwhile, the cost is high.
Disclosure of Invention
In view of the above, the invention aims to overcome the defects in the prior art and provides a silicon oxide inoculation nodular cast iron process.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a silicon oxide inoculation nodular cast iron process comprises the following steps:
sequentially adding a layer of nodulizer and a layer of covering agent into the pit of the ladle from bottom to top;
firstly, adding a ferrosilicon block into a part of a ladle above a covering agent;
pouring molten iron, pouring along with the molten iron, and adding the ferrosilicon block again.
Further, the molten iron comprises the following components in percentage by mass: 3.2-3.8% of C, 1.9-2.7% of Si, 0.1-0.6% of Mn, less than or equal to 0.04% of P, 0.02-0.008% of S, 0.035-0.045% of Mg, 0.02-0.03% of Ce, 0.4-0.6% of Cu, 0.05-0.08% of Sn, 0.3-0.5% of Mo and the balance of pig iron.
Further, the covering agent adopts a steel sheet.
Further, the granularity of the ferrosilicon block is 30-40mm 3 。
Further, the temperature of the molten iron is controlled between 1460 ℃ and 1500 ℃.
Further, the spheroidizing agent adopts the granularity of 5-20mm 3 MgSiCeFe alloy of (a).
Further, when molten iron is filled, the first 70% part is filled rapidly, the second 30% part is slowed down in filling speed, and in the process of filling molten iron slowly, the ferrosilicon block is added again.
Compared with the prior art, the invention has the following advantages:
in the process adopted by the invention, silicate (SiO 2) generated by oxidizing silicon on the surface of molten iron containing magnesium is mixed with molten iron, so that the inoculation effect of ductile iron can be obviously improved, and the quality of spheroidal graphite cast iron is greatly improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute an undue limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of the process of the present invention in practice.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the invention, it should be understood that the terms "center," "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
A silicon oxide inoculation nodular cast iron process comprises the following steps:
a nodulizer 1 and a covering agent layer 2 are sequentially arranged in the pit of the ladle 4 from bottom to top;
firstly, adding a silicon iron block 3 into the part of the ladle above the covering agent, wherein the covering agent is generally steel sheet, and the thickness of the steel sheet is generally 1-5mm. The nodulizer generally adopts the granularity of 5-20mm 3 MgSiCeFe alloy of (a).
Pouring molten iron, pouring along with the molten iron, and adding the ferrosilicon block again. The granularity of the silicon iron block is 30-40mm 3 . Typically, the molten iron temperature is controlled between 1460 ℃ and 1500 ℃. As shown in fig. 1, a schematic view of a ladle used in the present invention is shown.
Specifically, when molten iron is filled, 70% of molten iron is firstly rapidly filled, then 30% of molten iron is slowly filled, and in the process of slowly filling molten iron, a silicon iron block is added again to form floating silicon, so that SiO2 can be generated by reaction with oxygen at high temperature, and the growth of spherical graphite is very facilitated.
In general, the ferrosilicon blocks added before molten iron pouring and the ferrosilicon blocks added during slow pouring of molten iron each account for half of the total ferrosilicon block filling amount, namely, half of the ferrosilicon blocks are firstly put in before molten iron is poured, and the ferrosilicon blocks fully react with molten iron at the bottom of a ladle and gradually float upwards to fully react with molten iron during spheroidization reaction of molten iron. After entering molten iron, the added ferrosilicon block floats upwards. During the reaction, it was seen by naked eyes that the ferrosilicon block tumbles in the molten iron to appear magnesium light.
The ferrosilicon blocks suspended in the molten iron can react with oxygen in the air under the high temperature condition of the molten iron to generate a transition layer SiO2 required by the growth of the ductile iron graphite. And then uniformly winding molten silicon (Si) which is not oxidized and silicon dioxide (SiO 2) generated by oxidation into the molten iron by utilizing the molten iron in the spheroidizing process to turn over.
The ferrosilicon block selected in the invention is preferably 75 ferrosilicon, and the specific gravity of the ferrosilicon is more than 6 because the specific gravity of the 75 ferrosilicon is 3.6. After the molten iron enters the ladle, the 75 silicon iron nuggets float on the surface of the molten iron.
In the prior art, the price of the imported sulfur-oxygen inoculant is about 40000 yuan/ton under the conventional process conditions, and the price of the imported high-bismuth inoculant is about 30000 yuan/ton (the addition amount is 0.15%).
In the prior art, the price of inoculant adopted in the conventional process condition for producing the grade 3-grade 4 ductile iron is generally more than or equal to 12000 yuan/ton (the addition amount is 0.2%).
The process can effectively save cost, and the inoculation material cost is compared with the following table:
by adopting the silicon oxide inoculation technology provided by the invention, more than 2 grades of ductile iron can be produced by adopting domestic ferrosilicon, and the price is less than or equal to 7000 yuan/ton. In actual industrial production, the production cost can be greatly reduced, and the profit margin can be improved. The silicon oxidation technology is used for producing the spheroidal graphite cast iron, so that the process is stable, the operation is simple and convenient, the cost is reduced, and spherical graphite with round morphology is easier to obtain.
In a specific embodiment, the molten iron comprises the following components in percentage by mass: 3.2-3.8% of C, 1.9-2.7% of Si, 0.1-0.6% of Mn, less than or equal to 0.04% of P, 0.02-0.008% of S, 0.035-0.045% of Mg, 0.02-0.03% of Ce, 0.4-0.6% of Cu, 0.05-0.08% of Sn, 0.3-0.5% of Mo and the balance of pig iron.
The process adopted by the invention is simple to operate and easy to implement, and can obviously improve the inoculation effect of ductile iron and greatly improve the quality of ductile iron.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A silicon oxide inoculation nodular cast iron process is characterized by comprising the following steps:
sequentially adding a layer of nodulizer and a layer of covering agent into the pit of the ladle from bottom to top;
firstly adding ferrosilicon blocks with granularity of 30-40mm into the part of the ladle above the covering agent 3 ；
Pouring molten iron, adding a silicon-iron block again along with the pouring of the molten iron to form floating silicon, and blending silicate generated by oxidizing silicon on the surface of the molten iron containing magnesium into the molten iron to improve the inoculation effect of the ductile iron;
the molten iron comprises the following components in percentage by mass: 3.2-3.8% of C, 1.9-2.7% of Si, 0.1-0.6% of Mn, less than or equal to 0.04% of P, 0.02-0.008% of S, 0.035-0.045% of Mg, 0.02-0.03% of Ce, 0.4-0.6% of Cu, 0.05-0.08% of Sn, 0.3-0.5% of Mo and the balance of pig iron; when molten iron is filled, the first 70% part is filled rapidly, the second 30% part is slowed down in filling speed, and the second ferrosilicon block is added in the process of filling molten iron slowly;
before molten iron is poured, firstly, a silicon iron block accounting for half of the total amount is put in, when the molten iron is spheroidized, the silicon iron block fully reacts with molten iron at the bottom of a ladle and gradually floats upwards, then the added silicon iron block floats upwards again in the reaction process after entering the molten iron, so that the silicon iron block suspended in the molten iron reacts with oxygen in air to generate a transition layer SiO under the high-temperature condition of the molten iron 2 Molten iron in the spheroidizing process is utilized to turn over, and molten silicon which is not oxidized and silicon dioxide generated by oxidation are uniformly involved in the molten iron so as to promote the stable growth of the secondary spheroidal graphite cast iron.
2. The process for inoculating ductile iron by silicon oxide according to claim 1, wherein the process is characterized by comprising the following steps: the covering agent adopts a steel sheet.
3. The process for inoculating ductile iron by silicon oxide according to claim 1, wherein the process is characterized by comprising the following steps: the temperature of the molten iron is controlled between 1460 ℃ and 1500 ℃.
4. The process for inoculating ductile iron by silicon oxide according to claim 1, wherein the process is characterized by comprising the following steps: the granularity of the nodulizer is 5-20mm 3 MgSiCeFe alloy of (a).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010138797.7A CN113337774B (en) | 2020-03-03 | 2020-03-03 | Silicon oxide inoculation nodular cast iron technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010138797.7A CN113337774B (en) | 2020-03-03 | 2020-03-03 | Silicon oxide inoculation nodular cast iron technology |
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| CN113337774A CN113337774A (en) | 2021-09-03 |
| CN113337774B true CN113337774B (en) | 2023-12-15 |
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|---|---|---|---|---|
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| CN113337774A (en) | 2021-09-03 |
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