CN113930572A - Method for reducing element burning loss in inoculant smelting process - Google Patents
Method for reducing element burning loss in inoculant smelting process Download PDFInfo
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- CN113930572A CN113930572A CN202111215109.3A CN202111215109A CN113930572A CN 113930572 A CN113930572 A CN 113930572A CN 202111215109 A CN202111215109 A CN 202111215109A CN 113930572 A CN113930572 A CN 113930572A
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- inoculant
- burning loss
- smelting
- reducing element
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C28/00—Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
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Abstract
The invention relates to the technical field of inoculant use in nodular cast iron smelting, in particular to a method for reducing element burning loss in an inoculant smelting process, which comprises the following steps: the method comprises the steps of putting raw materials into an electric arc furnace, heating and melting, wherein the raw materials are components of an inoculant except rare elements, controlling the melting temperature to be within the range of 1300-. The invention has the beneficial effects that: in the method for reducing element burning loss in the inoculant smelting process, the metal bismuth is filled by adopting the burning loss suppressor, so that the metal bismuth can react in the center of a high-temperature solution in a short time, the burning loss of metal is greatly reduced, the segregation phenomenon of the metal bismuth in the inoculant is avoided, and the quality of an inoculant product is improved.
Description
Technical Field
The invention relates to the technical field of inoculant use in nodular cast iron smelting, in particular to a method for reducing element burning loss in an inoculant smelting process.
Background
The inoculant is widely applied to the smelting production process of the nodular cast iron as a product for performing main inoculation on the nodular cast iron, and the good inoculant can provide better crystal nuclei for the smelting process of the nodular cast iron, so that the nodular crystal nuclei can be uniformly distributed, and a foundation is provided for subsequent growth of the nodular cast iron. However, in the production process of the inoculant, part of rare elements have high activity and violent reaction, and in the production process, the absorptivity is lower, so that the resource waste is serious, and therefore, in the production process, the method has great significance for reducing the burning loss of some rare elements and improving the yield.
Disclosure of Invention
In order to overcome the defects of the prior art, the technical problems to be solved by the invention are as follows: provides a method for reducing element burning loss in the inoculant smelting process.
In order to solve the technical problems, the invention adopts the technical scheme that: the method for reducing element burning loss in the inoculant smelting process comprises the following steps:
the method comprises the steps of putting raw materials into an electric arc furnace, heating and melting, wherein the raw materials are components of an inoculant except rare elements, controlling the melting temperature to be within the range of 1300 plus 1450 ℃, placing the rare elements in a burning loss suppressor, the burning loss suppressor is a hexahedral frame formed by welding iron strips, arranging a box which is made of metal and provided with an opening in the center of the hexahedral frame, welding the box to the center of the frame through long-strip-shaped iron strips, placing the rare elements in the box of the burning loss suppressor after the raw materials are completely melted into soup, immersing the burning loss suppressor into the soup, preserving heat, melting for 3-8 minutes, melting for 5-9 minutes by smelting electric, discharging the soup, casting, and obtaining the inoculant after casting.
Further, in the method for reducing element burning loss in the inoculant smelting process, the rare element is bismuth.
Further, in the method for reducing element burning loss in the inoculant smelting process, the percentage of the finally obtained inoculant components is as follows: si: 67-78%, Ca: 0.7-2.0%, Al: less than or equal to 1 percent, Bi: 0.8-2.8% and the balance of iron.
Further, in the method for reducing element burning loss in the inoculant smelting process, the percentage of the finally obtained inoculant components is as follows: si: 74%, Ca: 1.3%, Al: less than or equal to 0.9 percent, Bi: 1.5 percent and the balance of iron.
Further, in the method for reducing element burning loss in the inoculant smelting process, the electric arc furnace is a 0.5-ton electric arc furnace equipped with a 1350KVA capacity transformer.
The invention has the beneficial effects that: in the method for reducing element burning loss in the inoculant smelting process, the metal bismuth is filled by adopting the burning loss suppressor, so that the metal bismuth can react in the center of a high-temperature solution in a short time, the burning loss of metal is greatly reduced, the yield of the metal bismuth is improved from 40% to more than 85%, and the production cost is reduced. In addition, the bismuth-containing inoculant of the invention has uniform distribution of metal bismuth, avoids the segregation phenomenon of the metal bismuth in the inoculant and improves the quality of inoculant products.
Drawings
FIG. 1 is a schematic view of a burnout suppressor according to an embodiment of the present invention;
description of reference numerals:
1. a hexahedral frame; 2. and (4) a box.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, the present invention provides a method for reducing element burning loss in an inoculant smelting process, comprising the following steps:
the method comprises the steps of putting raw materials into an electric arc furnace, heating and melting, wherein the raw materials are components of an inoculant except rare elements, controlling the melting temperature to be within the range of 1300 plus 1450 ℃, placing the rare elements in a burning loss suppressor, the burning loss suppressor is a hexahedral frame 1 formed by welding iron strips, arranging a box 2 which is made of metal and is provided with an opening in the center, welding the box 2 to the center of the frame through the long iron strips, placing the rare elements in the box 2 of the burning loss suppressor, enabling the density of the burning loss suppressor to be larger than that of soup, completely melting the raw materials into the soup after the raw materials are completely melted, immersing the burning loss suppressor into the soup, carrying out heat preservation melting for 3-8 minutes, carrying out electric melting for 5-9 minutes, discharging the soup, casting, and obtaining the inoculant after casting.
All the raw materials of the inoculant comprise 80-100 parts of siliceous alloy raw materials, 20-30 parts of other rare earth and calcium materials and 2-8 parts of metal bismuth according to the weight ratio, and the prepared inoculant comprises the following components in percentage by weight: si: 67-78%, Ca: 0.7-2.0%, Al: less than or equal to 1 percent, Bi: 0.8-2.8% and the balance of iron. In the method, the temperature is controlled in the smelting temperature rise process, and when the furnace burden enters the furnace in the initial stage, submerged arc heating is carried out, the temperature rises, and the furnace burden is fed to 1300-1400 ℃ to melt the rest materials.
The method for reducing element burning loss in the inoculant smelting process has the following advantages:
by adopting the method of putting the burnout suppressor, because the metal bismuth is put in the box, the metal bismuth can react in the center of the high-temperature solution in a short time, and the metal can be directly put into a molten pool with less flash and less burnout, so that the yield of the metal bismuth is improved from 40 percent to more than 85 percent, thereby reducing the production cost; by adopting the form of power-off dissolution, the process can reduce part of energy consumption, and the self-heating dissolution is carried out after the burning loss suppression device is put into the process, so that the effects of energy conservation and emission reduction are achieved; in the bismuth-containing inoculant prepared by the invention, finished metal bismuth is uniformly distributed, product segregation is small, the production cost can be reduced, the metal bismuth can be effectively utilized, and the environmental burden is reduced.
Example 1
A method for reducing element burning loss in an inoculant smelting process comprises the following steps:
putting a raw material into an electric arc furnace, heating and melting, wherein the raw material is a component of an inoculant except rare elements, controlling the melting and heating to 1300 ℃, completely melting the raw material into a soup, placing the rare elements into a burning inhibitor, the burning inhibitor is a hexahedral frame formed by welding iron strips, a box which is made of metal and is provided with an opening is arranged in the center of the hexahedral frame, the box is welded to the center of the frame through the long iron strips, placing the rare elements into the box of the burning inhibitor, the density of the burning inhibitor is greater than that of the soup, and immersing the burning inhibitor into the soup; and (3) preserving heat, smelting for 3 minutes, then electrically smelting for 5 minutes, pouring, and casting to obtain the inoculant. The raw materials of the inoculant comprise a siliceous alloy raw material, a rare earth and calcium material and metal bismuth, and the prepared inoculant comprises the following components in percentage: si: 67%, Ca: 0.7%, Al: less than or equal to 1 percent, Bi: 0.8 percent and the balance of iron.
Example 2
A method for reducing element burning loss in an inoculant smelting process comprises the following steps:
putting a raw material into an electric arc furnace, heating and melting, wherein the raw material is a component of an inoculant except rare elements, controlling the melting and heating within the range of 1450 ℃, after the raw material is completely melted into a soup, placing the rare elements into a burning inhibitor, wherein the burning inhibitor is a hexahedral frame formed by welding iron strips, a box made of metal and provided with an opening is arranged in the center of the hexahedral frame, the box is welded to the center of the frame through long iron strips, placing the rare elements into the box of the burning inhibitor, the density of the burning inhibitor is greater than that of the soup, and immersing the burning inhibitor into the soup; and (3) preserving heat, smelting for 8 minutes, then electrically smelting for 9 minutes, pouring, and casting to obtain the inoculant. The percentage of the components of the prepared inoculant is as follows: si: 78%, Ca: 2.0%, Al: less than or equal to 1 percent, Bi: 2.8 percent and the balance of iron.
Example 3
A method for reducing element burning loss in an inoculant smelting process comprises the following steps:
a0.5 ton arc furnace equipped with a 1350KVA capacity transformer was used as the furnace. The raw materials are put into an electric arc furnace firstly to be heated and melted, the melting temperature is controlled within the range of 1370 ℃, the raw materials are completely melted, the suppression device is immersed in the soup by utilizing the principle that the density of a burning loss suppressor is larger than that of the soup, the suppressor is made of iron, the melting point is higher, and the melting point of metal bismuth is low, so that the metal bismuth is melted firstly, the metal bismuth can be melted in the middle of the soup, the burning loss of rare metal bismuth is greatly reduced, after waiting for 5 minutes, the metal bismuth is electrified and heated for 5 minutes, the stirring is promoted, and the raw materials are directly cast after being discharged. The inoculant comprises 85 parts of siliceous alloy raw materials, 23 parts of rest rare earth and calcareous materials and 3 parts of metal bismuth in parts by weight, and the inoculant comprises the following components in percentage: si: 72%, Ca: 1.1%, Al: less than or equal to 0.9 percent, Bi: 2.3 percent of iron and the balance of iron. The yield of the metal bismuth reaches 85 percent.
Example 4
A method for reducing element burning loss in an inoculant smelting process comprises the following steps:
a0.5 ton arc furnace equipped with a 1350KVA capacity transformer was used as the furnace. The raw materials are put into an electric arc furnace firstly to be heated and melted, the melting temperature is controlled within the range of 1357 ℃, the raw materials are completely melted, the suppressor is immersed in the soup by utilizing the principle that the density of the burning loss suppressor is larger than that of the soup, the suppressor is made of iron, the melting point is higher, and the melting point of the metal bismuth is low, so that the metal bismuth is firstly melted, the metal bismuth can be melted in the middle of the soup, the burning loss of the rare metal bismuth is greatly reduced, after waiting for 5 minutes, the metal bismuth is electrified and heated for 7 minutes to promote stirring, and the raw materials are directly cast after being discharged. The inoculant comprises 85 parts of siliceous alloy raw materials, 23 parts of other rare earth and calcareous materials and 4 parts of metal bismuth in parts by weight, and the inoculant comprises the following components in percentage: si: 74%, Ca: 1.3%, Al: less than or equal to 0.9 percent, Bi: 1.5 percent and the balance of iron. The yield of the metal bismuth reaches 92 percent.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (5)
1. A method for reducing element burning loss in an inoculant smelting process is characterized by comprising the following steps:
the method comprises the steps of putting raw materials into an electric arc furnace, heating and melting, wherein the raw materials are components of an inoculant except rare elements, controlling the melting temperature to be within the range of 1300 plus 1450 ℃, placing the rare elements in a burning loss suppressor, the burning loss suppressor is a hexahedral frame formed by welding iron strips, arranging a box which is made of metal and provided with an opening in the center of the hexahedral frame, welding the box to the center of the frame through long-strip-shaped iron strips, placing the rare elements in the box of the burning loss suppressor after the raw materials are completely melted into soup, immersing the burning loss suppressor into the soup, preserving heat, melting for 3-8 minutes, melting for 5-9 minutes by smelting electric, discharging the soup, casting, and obtaining the inoculant after casting.
2. The method of reducing elemental burnout during inoculant smelting according to claim 1, wherein the rare earth element is bismuth.
3. The method of reducing element burn-out during inoculant smelting as claimed in claim 2, wherein the resulting inoculant comprises the following percentage of constituent elements: si: 67-78%, Ca: 0.7-2.0%, Al: less than or equal to 1 percent, Bi: 0.8-2.8% and the balance of iron.
4. The method of reducing element burn-out during inoculant smelting as claimed in claim 1, wherein the resulting inoculant comprises the following percentage of constituent elements: si: 74%, Ca: 1.3%, Al: less than or equal to 0.9 percent, Bi: 1.5 percent and the balance of iron.
5. The method of reducing element burn-out during inoculant smelting as claimed in claim 1, wherein said electric arc furnace is a 0.5 ton electric arc furnace equipped with a 1350KVA capacity transformer.
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| CN101086029A (en) * | 2007-07-16 | 2007-12-12 | 郭庆成 | High Ca, silicon-free aluminum calcium iron alloy for deoxidising of molten steel and its preparation method |
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| CN109929960A (en) * | 2019-04-15 | 2019-06-25 | 南京浦江合金材料股份有限公司 | A kind of silicon strontium inoculant preparation process improving recovery rate |
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2021
- 2021-10-19 CN CN202111215109.3A patent/CN113930572B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101086029A (en) * | 2007-07-16 | 2007-12-12 | 郭庆成 | High Ca, silicon-free aluminum calcium iron alloy for deoxidising of molten steel and its preparation method |
| CN102191351A (en) * | 2011-03-17 | 2011-09-21 | 上海大学 | Low-carbon alloy steel smelting method capable of reducing volatile alloy element burning loss, packaging body, long belt of packaging body and feeding method and special feeding device of packaging body |
| CN102392175A (en) * | 2011-10-20 | 2012-03-28 | 宁波康发铸造有限公司 | Inoculant, preparation method thereof and application thereof in nodular cast iron smelting |
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| CN106834588A (en) * | 2017-03-17 | 2017-06-13 | 南京浦江合金材料股份有限公司 | A kind of preparation technology of the bismuth-containing inovulant for high-toughness ductile iron |
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