CN114214482A - Pellet for adsorbing aluminum oxide inclusion in steel ladle molten steel - Google Patents
Pellet for adsorbing aluminum oxide inclusion in steel ladle molten steel Download PDFInfo
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- CN114214482A CN114214482A CN202111452695.3A CN202111452695A CN114214482A CN 114214482 A CN114214482 A CN 114214482A CN 202111452695 A CN202111452695 A CN 202111452695A CN 114214482 A CN114214482 A CN 114214482A
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
- C21C2007/0062—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires with introduction of alloying or treating agents under a compacted form different from a wire, e.g. briquette, pellet
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a pellet for adsorbing aluminum oxide inclusion in molten steel in a steel ladle, which is prepared from the following components in parts by weight: 30-35 parts of white corundum powder with the particle size of 0.044-0.074mm, 20-35 parts of gamma active alumina balls with the particle size of 0.149-1mm, 20-43 parts of limestone with the particle size of 0.149-3mm, 5-10 parts of metallic aluminum with the particle size of 0.074mm-1mm and 1-1.5 parts of binding agent with the particle size of less than 0.044 mm; the pellets can be quickly decomposed in molten steel, and can quickly capture suspended aluminum oxide inclusions during aluminum deoxidation, so that the aluminum oxide inclusion removal effect is good, and the pellet has good application value in an aluminum deoxidation process.
Description
Technical Field
The invention belongs to the technical field of ladle refining, and particularly relates to a pellet for adsorbing aluminum oxide inclusion in molten steel in a ladle.
Background
The molten steel deoxidation is used as a necessary step in the refining process of a steel-making ladle, most deoxidizers mainly use ferrosilicon, ferro-aluminum, ferromanganese and an aluminum wire, the deoxidation capability is aluminum, silicon and manganese from large to small, and at present, a two-step deoxidation method is mostly used, wherein the ferrosilicon is added for deoxidation, then the ferrosilicon and the ferromanganese are added for alloying, and finally the aluminum wire is added for final deoxidation adjustment, so that the method can enhance the yield of the alloy.
Most steel mills aluminum iron is added in the converter tapping process, in the process, aluminum deoxidation products are formed in a large quantity, the particle size of fine aluminum oxide inclusions generated by the aluminum deoxidation products is between 0.02mm and 0.05mm, the fine aluminum oxide inclusions partially float upwards and partially suspend, the suspended fine aluminum oxide particles are gathered at a water gap part, and the water gap part is accumulated to cause the nodulation at the water gap part, so that the castability is poor, and meanwhile, the aluminum oxide inclusion defect of steel is also caused.
In order to reduce the aluminum oxide inclusion, deoxidizers such as carbon, silicon, manganese, barium and the like are adopted in part of steel mills to replace aluminum deoxidation, so that the generation amount of the aluminum oxide inclusion is reduced, but the subsequent decarburization process time is increased for the ultra-low carbon steel grade by the carbon deoxidation, and the deoxidation efficiency is not as fast as the aluminum deoxidation, so that the process time is further prolonged.
Disclosure of Invention
Aiming at the problems that the time of a subsequent decarburization process is increased and the deoxidation efficiency is not as fast as the aluminum deoxidation, which leads to further extension of the process time, in the case of the ultra-low carbon steel grade by adopting deoxidizers such as carbon, silicon, manganese, barium and the like to replace the aluminum deoxidation, the invention provides a pellet for adsorbing aluminum oxide inclusions in molten steel in a steel ladle.
The technical scheme of the invention is as follows: a pellet for adsorbing aluminum oxide inclusion in steel ladle molten steel is prepared from the following components in parts by weight:
30-35 parts of white corundum powder with the particle size of 0.044-0.074mm, 20-35 parts of gamma active alumina balls with the particle size of 0.149-1mm, 20-43 parts of limestone with the particle size of 0.149-3mm, 5-10 parts of metallic aluminum with the particle size of 0.074mm-1mm and 1-1.5 parts of binding agent with the particle size of less than 0.044 mm;
wherein:
the white corundum powder contains Al by weight2O3More than or equal to 95 percent and less than or equal to 1 percent of water;
the gamma active alumina trioxide ball contains Al by weight2O3More than or equal to 99 percent and less than or equal to 1 percent of water;
the limestone contains more than or equal to 50 percent of CaO, the ignition loss is more than or equal to 25 percent, and the water content is less than or equal to 5 percent by weight;
the aluminum metal contains more than or equal to 99 percent of Al and less than or equal to 1 percent of water by weight.
In the invention: the white corundum powder is prepared by grinding and screening white corundum particles, and the main component of the white corundum powder is Al2O3The pellet has the characteristics of high melting point and high temperature resistance, the selected particle size range is utilized, the principle that large crystal nuclei capture small crystal nuclei is utilized, the alumina inclusions are agglomerated, and the selection of the particle size is the key of pellet press forming.
The gamma active alumina ball is produced by electrically melting gamma phase active alumina and blowing through inserting into guide pipe.
Limestone is natural ore and mainly contains CaCO3Can be decomposed into CaO and CO at the high temperature of 850 DEG C2Promote the decomposition of the pellets and simultaneously enable calcium oxide to react with Al2O3The aluminum-calcium phase is formed to promote the aluminum oxide inclusion to float upwards, and the generated CO2Can also drive fine alumina inclusions to float upwards.
The metal aluminum particles are prepared by smelting aluminum ingots, preparing aluminum wires with different specifications and then performing cold cutting, wherein the content of the metal aluminum reaches more than 99.5 wt%, and the functions of the aluminum particles are as follows: firstly, the pellet reacts with water to generate heat in the production process and control the moisture of the pellet, and secondly, the pellet reacts in molten steel to completely disperse the pellet and promote various materials to play roles.
The binder provides initial strength for the pellets, preventing secondary crushing.
Further limiting, the size of the pellets is 20mm multiplied by 20mm, so that the pellets can enter storage bins of large steel mills, slide smoothly, can be added automatically, and can be decomposed well in the using process.
Further limiting, the moisture content of the pellets is less than or equal to 1 percent by weight, and the control measures of the moisture content of the pellets can be controlled by adopting a mode of combining natural heating airing and baking.
Further defined, the binder is made primarily of starch and cellulose, and the pH of the binder is greater than 7.
Further limit, the pellet contains more than or equal to 4 percent of Al by weight and Al2O3More than or equal to 50 percent, more than or equal to 10 percent of CaO and more than or equal to 5 percent of ignition loss.
The invention has the beneficial effects that: the pellets disclosed by the invention can be quickly decomposed into granular materials in molten steel, and can quickly capture fine aluminum oxide inclusions generated by aluminum deoxidation, so that the fine aluminum oxide inclusions float upwards and are combined with ladle slag, further the aluminum oxide inclusions are reduced, the time of the whole process is short, and a decarburization process is not needed.
Detailed Description
According to the utility, the pellet chemical indexes for adsorbing the alumina inclusions in the steel ladle molten steel are shown in the following table 1:
TABLE 1 physicochemical indexes of acceptability
| Item | Al，wt％ | Al2O3，wt％ | Burn reduced by weight% | CaO，wt％ | H2O，wt％ |
| Chemical index requirement | ≥4 | ≥50 | ≥5 | ≥10 | ≤1 |
The invention will now be further described with reference to the following examples, but the invention is not limited thereto.
The detection conditions of the main raw materials of white corundum powder, gamma-phase alumina balls, limestone and metal aluminum adopted in the embodiment are shown in table 2.
TABLE 2 raw material chemical composition test conditions
In the embodiment, the binding agent is prepared from cellulose and starch, and the technical indexes of the binding agent are as follows: white powder with the grain diameter less than 0.044mm, and the initial ball strength is more than 140N by adopting a function acceptance mode.
The particle size requirements of the raw materials in the examples are as follows: white corundum powder with the grain diameter of 0.044-0.074mm, gamma active aluminum oxide balls with the grain diameter of 0.149-1mm, limestone with the grain diameter of 0.149-3mm, metal aluminum with the grain diameter of 0.074mm-1mm and a bonding agent with the grain diameter of less than 0.044 mm;
the pellets prepared in each example had a size of 20X 20 mm.
Example 1
30kg of white corundum powder, 25kg of gamma active alumina balls, 34kg of limestone, 10kg of metal aluminum and 1.3kg of binding agent are put into an automatic weighing system, water is added, stirring and ball pressing procedures are carried out to obtain wet pellets, the wet pellets are stacked in a natural airing field through a three-dimensional matrix distribution system, the initial strength of the wet pellets is averagely 166N, the metal aluminum reacts to release heat in the natural airing process to evaporate part of water, then the wet pellets are sent into a baking kiln to be dried, the physical and chemical index results of the pellets for adsorbing aluminum oxide inclusion in molten steel of a steel ladle are sampled and detected, the results are shown in a table 3, and the pellets are transported to a rear storage bin of a steel making converter of a certain steel mill to be used after being detected to be qualified.
Table 3 example 1 pellet physical and chemical test results for adsorption of alumina inclusions in ladle molten steel
| Item | Al，wt％ | Al2O3，wt％ | Burn reduced by weight% | CaO，wt％ | H2O，wt％ |
| Chemical finger | 9.2 (partial oxidation loss) | 54.35 | 10.2 | 17.34 | 0.9 |
Description of the effects of use: aluminum and iron are added when about one fourth of steel is tapped from the steel-making converter, the pellets prepared in the embodiment are added when about one third of steel is tapped, the pellets prepared in the embodiment are used in the semi-steel tapping process, the test is carried out for 18 times, the adding amount is 3 kg/ton of steel, the dispersibility of the pellets in the adding process is good, and no splashing phenomenon occurs; compared with the original process (adopting carbon as a deoxidizer), the method has the advantages that the aluminum oxide inclusion with the grain diameter of 0.02mm-0.05mm is reduced from 65 percent to 13 percent on average, the aluminum oxide inclusion with the grain diameter of more than 0.05mm is reduced from 25 percent to 5 percent on average, and the aluminum oxide inclusion removal effect is good.
The following examples describe only the formulation and the effect of use and the preparation method is the same as example 1.
Example 2
33kg of white corundum powder, 20kg of gamma-activated alumina pellets, 20kg of limestone, 5kg of metal aluminum and 1kg of bonding agent are prepared into pellets according to the preparation method disclosed in the embodiment 1, and the physicochemical indexes of the pellets fall into the required range.
Description of the effects of use: adding aluminum iron when about one fourth of steel is tapped from a steel-making converter, adding the pellets prepared in the embodiment when about one third of steel is tapped, performing 15 tests on the pellets prepared in the embodiment in the semi-steel tapping process, wherein the adding amount is 3 kg/ton of steel, the pellets are good in dispersity in the adding process, and no splashing phenomenon occurs; compared with the original process (adopting carbon as a deoxidizer), the method has the advantages that the aluminum oxide inclusion with the grain diameter of 0.02mm-0.05mm is reduced to 11 percent from 65 percent on average, the aluminum oxide inclusion with the grain diameter of more than 0.05mm is reduced to 8 percent from 25 percent, and the aluminum oxide inclusion removal effect is good.
Example 3
The pellets are prepared by the preparation method disclosed in the embodiment 1 according to 35kg of white corundum powder, 35kg of gamma-activated alumina balls, 43kg of limestone, 8kg of metal aluminum and 1.5kg of bonding agent, and the physicochemical indexes of the pellets fall within the required range.
Description of the effects of use: the aluminum iron is added when about one fourth of the steel is tapped from the steel-making converter, the pellets prepared in the embodiment are added when about one third of the steel is tapped, the pellets prepared in the embodiment are used in the semi-steel tapping process, 10 tests are carried out, the adding amount is 3 kg/ton of steel, the dispersibility of the pellets is good in the adding process, and no splashing phenomenon occurs; compared with the original process (adopting carbon as a deoxidizer), the method has the advantages that the aluminum oxide inclusion with the grain diameter of 0.02mm-0.05mm is reduced to 10% from 65% on average, the aluminum oxide inclusion with the grain diameter of more than 0.05mm is reduced to 10% from 25%, and the aluminum oxide inclusion removal effect is good.
From the examples 1-3, it can be known that the pellets produced by the invention for adsorbing the alumina inclusions in the steel ladle molten steel can be rapidly decomposed in the molten steel, can rapidly capture the suspended alumina inclusions during the aluminum deoxidation, and has good application value in the aluminum deoxidation process.
Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The pellet for adsorbing the aluminum oxide inclusion in the molten steel of the steel ladle is characterized by being prepared from the following components in parts by weight:
30-35 parts of white corundum powder with the particle size of 0.044-0.074mm, 20-35 parts of gamma active alumina balls with the particle size of 0.149-1mm, 20-43 parts of limestone with the particle size of 0.149-3mm, 5-10 parts of metallic aluminum with the particle size of 0.074mm-1mm and 1-1.5 parts of binding agent with the particle size of less than 0.044 mm;
wherein:
the white corundum powder contains Al by weight2O3More than or equal to 95 percent and less than or equal to 1 percent of water;
the gamma active alumina trioxide ball contains Al by weight2O3More than or equal to 99 percent and less than or equal to 1 percent of water;
the limestone contains more than or equal to 50 percent of CaO, the ignition loss is more than or equal to 25 percent, and the water content is less than or equal to 5 percent by weight;
the aluminum metal contains more than or equal to 99 percent of Al and less than or equal to 1 percent of water by weight.
2. The pellet for adsorbing the alumina inclusions in the molten steel of the ladle as recited in claim 1, wherein the pellet has a size of 20 x 20 mm.
3. The pellet for adsorbing aluminum oxide inclusion in molten steel in a steel ladle as claimed in claim 1, wherein the pellet contains moisture of 1% by weight or less.
4. The pellet for adsorbing alumina inclusions in molten steel in a ladle according to any one of claims 1 to 3, wherein the binder is mainly made of starch and cellulose, and has a pH of more than 7.
5. The pellet for adsorbing aluminum oxide inclusion in molten steel in a steel ladle as claimed in claim 4, wherein the pellet contains Al not less than 4% by weight, and Al2O3More than or equal to 50 percent, more than or equal to 10 percent of CaO and more than or equal to 5 percent of ignition loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111452695.3A CN114214482B (en) | 2021-12-01 | 2021-12-01 | Pellet for adsorbing aluminum oxide inclusion in steel ladle molten steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111452695.3A CN114214482B (en) | 2021-12-01 | 2021-12-01 | Pellet for adsorbing aluminum oxide inclusion in steel ladle molten steel |
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| CN114214482A true CN114214482A (en) | 2022-03-22 |
| CN114214482B CN114214482B (en) | 2022-12-06 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030209104A1 (en) * | 2001-03-27 | 2003-11-13 | Armando Villarreal | Compositions and method for the deoxidation of steel |
| CN1873030A (en) * | 2006-03-24 | 2006-12-06 | 梅才平 | Assistant deoxidizer in use for smelting cold rolled and hot rolled low carbon aluminium-killed steel |
| CN1962888A (en) * | 2006-11-20 | 2007-05-16 | 梅才平 | Ladle slag modified aluminium slag pellet |
| CN102586544A (en) * | 2012-03-20 | 2012-07-18 | 西峡县恒基冶材有限公司 | High-calcium pre-molten slag modification aluminium slag ball and preparation method thereof |
| CN105112651A (en) * | 2015-09-28 | 2015-12-02 | 攀枝花钢城集团有限公司 | High-aluminum slag modifier pellets and production method thereof |
| CN105349734A (en) * | 2015-12-08 | 2016-02-24 | 钢城集团凉山瑞海实业有限公司 | Method adopting steel ladle casting residues and tailings for preparing high-aluminum slag modifier pellets and application thereof |
| CN107473719A (en) * | 2017-08-24 | 2017-12-15 | 浙江科屹耐火材料有限公司 | A kind of low carbon high-strength refractory material and its preparation technology |
-
2021
- 2021-12-01 CN CN202111452695.3A patent/CN114214482B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030209104A1 (en) * | 2001-03-27 | 2003-11-13 | Armando Villarreal | Compositions and method for the deoxidation of steel |
| CN1873030A (en) * | 2006-03-24 | 2006-12-06 | 梅才平 | Assistant deoxidizer in use for smelting cold rolled and hot rolled low carbon aluminium-killed steel |
| CN1962888A (en) * | 2006-11-20 | 2007-05-16 | 梅才平 | Ladle slag modified aluminium slag pellet |
| CN102586544A (en) * | 2012-03-20 | 2012-07-18 | 西峡县恒基冶材有限公司 | High-calcium pre-molten slag modification aluminium slag ball and preparation method thereof |
| CN105112651A (en) * | 2015-09-28 | 2015-12-02 | 攀枝花钢城集团有限公司 | High-aluminum slag modifier pellets and production method thereof |
| CN105349734A (en) * | 2015-12-08 | 2016-02-24 | 钢城集团凉山瑞海实业有限公司 | Method adopting steel ladle casting residues and tailings for preparing high-aluminum slag modifier pellets and application thereof |
| CN107473719A (en) * | 2017-08-24 | 2017-12-15 | 浙江科屹耐火材料有限公司 | A kind of low carbon high-strength refractory material and its preparation technology |
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