CN114309508A - CaO-BaO-MgO-Al2O3Quaternary slag system tundish covering agent and preparation method thereof - Google Patents
CaO-BaO-MgO-Al2O3Quaternary slag system tundish covering agent and preparation method thereof Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 72
- 239000002893 slag Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 82
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 30
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 27
- 239000011575 calcium Substances 0.000 claims abstract description 27
- 229910001610 cryolite Inorganic materials 0.000 claims abstract description 25
- QKYBEKAEVQPNIN-UHFFFAOYSA-N barium(2+);oxido(oxo)alumane Chemical compound [Ba+2].[O-][Al]=O.[O-][Al]=O QKYBEKAEVQPNIN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 15
- 229910003112 MgO-Al2O3 Inorganic materials 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 29
- 239000011268 mixed slurry Substances 0.000 claims description 26
- 239000000126 substance Substances 0.000 claims description 25
- 238000005469 granulation Methods 0.000 claims description 22
- 230000003179 granulation Effects 0.000 claims description 22
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 19
- 238000001694 spray drying Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 16
- 239000000047 product Substances 0.000 claims description 16
- 229910052593 corundum Inorganic materials 0.000 claims description 14
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 14
- 238000012216 screening Methods 0.000 claims description 13
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 12
- 229910052731 fluorine Inorganic materials 0.000 claims description 12
- 238000004537 pulping Methods 0.000 claims description 11
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 10
- 238000004806 packaging method and process Methods 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 239000006227 byproduct Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000001095 magnesium carbonate Substances 0.000 claims description 3
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- 230000036571 hydration Effects 0.000 claims description 2
- 238000006703 hydration reaction Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000000428 dust Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 40
- 239000010959 steel Substances 0.000 abstract description 40
- 230000000694 effects Effects 0.000 abstract description 15
- 230000003628 erosive effect Effects 0.000 abstract description 7
- 238000005245 sintering Methods 0.000 abstract description 5
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- 239000010703 silicon Substances 0.000 abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 2
- 238000012856 packing Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 20
- 238000002844 melting Methods 0.000 description 18
- 230000008018 melting Effects 0.000 description 18
- 238000009749 continuous casting Methods 0.000 description 8
- 238000005070 sampling Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000009628 steelmaking Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000002436 steel type Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 235000017550 sodium carbonate Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005475 siliconizing Methods 0.000 description 1
- 239000011775 sodium fluoride Substances 0.000 description 1
- 235000013024 sodium fluoride Nutrition 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides CaO-BaO-MgO-Al2O3A quaternary slag system tundish covering agent and a preparation method thereof belong to the technical field of metallurgical auxiliary materials. A CaO-BaO-MgO-Al2O3 quaternary slag system tundish covering agent is prepared from the following raw materials: 8-25 parts of magnesia powder, 37-69 parts of calcium slag powder, 16-41 parts of barium aluminate powder, 1-3 parts of regenerated cryolite powder and 1.5-3 parts of binder. Based on reasonable selection and scientific proportioning of raw materials, the obtained covering agent has good impurity adsorption capacity and excellent slag effect; the materials are selected without eroding the packing, so that the problems of sintering, crusting and the like are avoided; the phenomena of carburetion, silicon increase and the like polluting molten steel can not be generated.
Description
Technical Field
The invention belongs to the technical field of metallurgical auxiliary materials, and particularly relates to CaO-BaO-MgO-Al2O3A quaternary slag system tundish covering agent and a preparation method thereof.
Background
At present, the carbon-free low-silicon high-alkalinity slag system covering agent widely applied in China mainly uses CaO-Al2O3The binary slag system is mainly used, and although the slag system has a certain adsorption and inclusion effect, the binary slag system covering agent has a higher melting point and is easy to use in the actual use processThe problems of slag surface sintering and crusting occur, so that the adjustment of the stopper rod is limited, and the stopper rod is locked in serious conditions, so that the continuous casting production is interrupted. In order to lower the melting point of the slag system, improve the melting characteristics and avoid over-sintering, a large amount of Na-containing substances such as fluorite, sodium carbonate and sodium fluoride are required to be added2O, F flux material, and added Na-containing2O, F, the service life of the tundish refractory is reduced, and the corroded refractory particles enter the molten steel to pollute the molten steel, increase the inclusion content of the molten steel, reduce the quality of the steel, and have great adverse effect on the production of high-quality clean steel. In addition, minerals such as fluorite, soda ash and the like and chemical raw materials have great influence on resources and environment, and the price also rises year by year. Therefore, it is important to find a high-quality covering agent with high alkalinity, no pollution and low content of the agent.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide CaO-BaO-MgO-Al2O3The quaternary slag system is tundish covering agent.
The invention aims to solve another technical problem of providing a method for producing the tundish covering agent by using waste residues of metal calcium extracted by a thermal reduction method, barium aluminate, magnesia powder and regenerated cryolite in the electrolytic aluminum industry as raw materials.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
CaO-BaO-MgO-Al2O3The quaternary slag system tundish covering agent is prepared from the following raw materials: 8-25 parts of magnesia powder, 37-69 parts of calcium slag powder, 16-41 parts of barium aluminate powder, 1-3 parts of regenerated cryolite powder and 1.5-3 parts of binder.
Preferably, the particle sizes of the magnesite powder, the calcium slag powder, the barium aluminate powder and the regenerated cryolite powder are all below 100 meshes.
Preferably, the barium aluminate powder is prepared by the following method: mixing barium carbonate and alumina powder according to a mass ratio of 2: 1, putting the mixture into an electric arc furnace, heating to 1500 +/-20 ℃ to completely melt the mixture into liquid, pouring out the liquid, cooling to normal temperature, crushing the liquid into blocks with the particle size of less than or equal to 50mm, and processing the blocks into powder with the 100-mesh passing rate of more than or equal to 95 percent by a ball mill.
Preferably, the calcium slag powder is a waste material for producing metallic calcium by a thermal reduction method; the regenerated cryolite powder is a byproduct in the electrolytic aluminum industry.
Preferably, the CaO-BaO-MgO-Al2O3The quaternary slag system tundish covering agent comprises the following effective chemical components in percentage by mass: SiO 22≤1.5％、CaO 20.0～40.0％、MgO 8.5～24.5％、BaO 11.5～25.5％、Al2O327.5～34.0％、Na2O≤1.5％、F≤1.5％、H2O is less than or equal to 0.35 percent, and the balance is ignition loss and impurity components. Wherein the impurity component is mainly K2O、Fe2O3And TiO2And is not limited thereto.
As some preferred embodiments of the present invention, the SiO2The sum of the mass percentages of CaO, MgO and BaO is 50-70%, more preferably 51-68%, even more preferably 55-66%, and most preferably 60-65%.
Preferably, the binder is sodium carboxymethyl cellulose.
Preferably, the CaO-BaO-MgO-Al2O3The preparation method of the quaternary slag system tundish covering agent sequentially comprises the following steps: mixing slurry, spraying granulation, screening and dedusting, detecting products, packaging and warehousing.
As some preferred cases of the invention, the mixed pulping steps are specifically as follows: respectively weighing magnesia powder, calcium slag powder, barium aluminate powder, regenerated cryolite powder and a binder according to the parts by weight, placing the materials in a pulping tank, adding water, and stirring to prepare mixed slurry;
in order to ensure the slurry to be uniform and prevent hydration, the stirring is strictly controlled for 30-45 min, and the following can be selected: 30min, 32min, 35min, 38min, 40min, 42min or 45 min;
the water adding amount is based on the standard of preparing uniform slurry, corresponding adjustment can be carried out according to specific conditions, and preferably, the mass ratio of raw materials to water is controlled to be 1: 0.6-1: 0.7, specifically 1: 0.6, 1: 0.61, 1: 0.65, 1: 0.69 or 1: 0.7.
as some preferred cases of the invention, the spray granulation step is specifically: pressurizing the mixed slurry to 1.5-1.8 Mpa by a plunger pump, and allowing the mixed slurry to enter a spray drying tower for spray granulation; specific pressurization pressures may be: 1.5MPa, 1.6MPa, 1.7MPa or 1.8 MPa;
setting the temperature in the spray drying tower to be 600-800 ℃, and can be as follows: 600 ℃, 610 ℃, 650 ℃, 690 ℃, 700 ℃, 710 ℃, 750 ℃, 790 ℃ or 800 ℃; the air outlet temperature is 150-200 ℃, and can be as follows: 150 deg.C, 160 deg.C, 170 deg.C, 180 deg.C, 190 deg.C, 200 deg.C.
As some preferred cases of the invention, the screening and dedusting steps are specifically as follows: and screening spray granulation particles with the granularity of 20-80 meshes to prepare the tundish covering agent.
As some preferred cases of the invention, the product detection steps are specifically as follows: sampling the tundish covering agent to detect chemical components, wherein the chemical components comprise the following components in percentage by mass: SiO 22≤1.5％、CaO 20.0～40.0％、MgO 8.5～24.5％、BaO 11.5～25.5％、Al2O3 27.5～34.0％、Na2O≤1.5％、F≤1.5％、H2O is less than or equal to 0.35 percent, and the balance is ignition loss and impurity components.
The tundish covering agent obtained based on the preparation method has high granularity and component uniformity, high detection qualification rate and good stability of use effect.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for preparing a catalyst by using CaO-BaO-MgO-Al2O3The tundish covering agent product of the quaternary slag system is prepared by selecting synthetic materials of barium aluminate, calcium slag, magnesia powder and regenerated cryolite.
The invention has the following advantages in the aspect of raw material selection:
(1) the calcium slag is used as waste material for producing calcium metal by thermal reduction method, and mainly comprises CaO and Al2O3SiO contained in2、TiO2、Fe2O3The harmful impurity elements such as S and P are all low, and are substitution compoundsThe ideal raw material of the finished material of calcium aluminate reduces the product cost and solves the problem of recycling the waste of the calcium slag.
(2) Regenerated cryolite is a by-product of the electrolytic aluminum industry as part of waste disposal, with Na contained therein+And F-The flux has good fluxing effect in a slag system, although the components are lower than those of the normal cryolite, the price is relatively lower, the cost of tundish covering agent can be effectively reduced, and a new treatment way is provided for the problem of recycling waste of regenerated cryolite.
(3) The barium aluminate, the calcium slag, the magnesia powder and the regenerated cryolite are all high-temperature calcined or synthesized substances, volatile substances are less than or equal to 1 percent, the problem of tundish steel water temperature drop caused by heat absorption of the volatile substances can be effectively solved, the tundish temperature is controlled to be reduced to be below 0.4 ℃/min, and the heat preservation effect of the covering agent is obviously improved.
The invention relates to CaO-BaO-MgO-Al2O3The quaternary slag system adopts BaO and MgO to replace partial CaO and simultaneously controls SiO in the slag system2Less than or equal to 1.5, and keeps higher alkalinity of the slag system, thereby ensuring good adsorption and inclusion of the slag. The barium aluminate synthesized by barium carbonate and alumina powder is added, so that the melting point of the whole slag system is reduced, and a small amount of regenerated cryolite is added in an auxiliary manner, so that the melting temperature of the slag system can be stably controlled within the proper range of 1280-1350 ℃, and the problem of crusting caused by over-high melting point of the covering agent and the corrosion hazard caused by low melting point are effectively avoided.
The content of sodium oxide and fluorine in the slag system is not higher than 1.5 percent, and CaO, BaO, MgO and Al are adopted2O3The substances can not react with the magnesium refractory material and the aluminum carbon stopper rod of the tundish to cause erosion, thereby effectively avoiding the conventional CaO-Al2O3Sintering and encrusting problems when the binary slag system flux is added in a small amount, and corrosion and inclusion problems when the flux is added in a large amount.
SiO in the slag system of the invention2Less than or equal to 1.5, can greatly reduce the possibility of generating silicon-aluminum oxidation reduction reaction for casting special steel grades of aluminum-containing steel and high-aluminum steel, avoids the pollution of recarburization, silicon increase and the like of molten steel, and avoids the burning loss of acid-soluble aluminumCan be controlled below 12 ppm.
Detailed Description
In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
The following examples illustrate the raw materials used:
magnesite powder, commercially available, with a particle size of 100 mesh;
the calcium slag powder is waste material for producing metal calcium by a thermal reduction method, and the granularity is 100 meshes;
the regenerated cryolite powder is a byproduct in the electrolytic aluminum industry, and the granularity is 100 meshes;
binder, sodium carboxymethylcellulose, commercially available;
ambient temperature, 15-25 degrees celsius as generally defined.
Preparing barium aluminate powder:
mixing barium carbonate and alumina powder according to a mass ratio of 2: 1, putting the mixture into an electric arc furnace, heating to 1500 +/-20 ℃ to completely melt the mixture into liquid, pouring out the liquid, cooling to normal temperature, crushing the liquid into blocks with the particle size of less than or equal to 50mm, and processing the blocks into powder with the 100-mesh passing rate of more than or equal to 95 percent by a ball mill.
Example 1
Weighing 10 parts of magnesia powder, 69 parts of calcium slag powder, 16 parts of barium aluminate powder, 2 parts of regenerated cryolite powder and 3 parts of binder, placing the materials in a pulping tank, adding water and stirring, wherein the mass ratio of the raw materials to the water is 1: 0.7, strictly controlling and stirring for 45min to prepare mixed slurry; pressurizing the mixed slurry to 1.8Mpa by a plunger pump, and then feeding the mixed slurry into a spray drying tower; setting the temperature in a spray drying tower to be 800 ℃, the air outlet temperature to be 200 ℃, and carrying out spray granulation; screening out spray granulation particles with the granularity of 20-80 meshes to prepare a tundish covering agent; sampling the tundish covering agent to detect chemical components, wherein the mass percentage of the chemical components is as follows: SiO 22 1.48％、CaO 38.14％、MgO 10.93％、BaO 11.95％、Al2O3 32.81％、Na2O 0.66％、F 0.77％、H20.27% of O, the balance of ignition loss and impurity components, melting point: 1327 ℃; and packaging qualified products and warehousing.
The tundish covering agent is used in the steelmaking continuous casting process of Sichuan iron and steel enterprises, and the process parameters are as follows: the capacity of the tundish is 30 tons, the steel type is IF automobile panel steel, and the tundish covering agent needs to be uniformly added into the tundish every time of pouring for about 12 hours, so that the operation of the black surface of the liquid surface is kept, and the liquid surface of the steel cannot be exposed.
In the using process, the covering agent has good spreadability in the steel ladle, no caking phenomenon, uniform and stable slagging, no crusting phenomenon and no erosion of a ladle lining. The finished product sample of the tundish is taken for detection, the problem of molten steel pollution caused by carburetion and the like is avoided, and the using effect is good.
Example 2
Weighing 17 parts by weight of magnesia powder, 52 parts by weight of calcium slag powder, 26 parts by weight of barium aluminate powder, 2.5 parts by weight of regenerated cryolite powder and 2.5 parts by weight of binder, placing the materials in a pulping tank, adding water and stirring, wherein the mass ratio of the raw materials to the water is 1: 0.6, strictly controlling and stirring for 30min to prepare mixed slurry; pressurizing the mixed slurry to 1.5Mpa by a plunger pump, and then feeding the mixed slurry into a spray drying tower; setting the temperature in a spray drying tower to be 600 ℃ and the air outlet temperature to be 150 ℃, and carrying out spray granulation; screening out spray granulation particles with the granularity of 20-80 meshes to prepare a tundish covering agent; sampling the tundish covering agent to detect chemical components, wherein the mass percentage of the chemical components is as follows: SiO 22 1.21％、CaO 28.60％、MgO 17.19％、BaO 16.38％、Al2O3 30.48％、Na2O 1.10％、F 1.28％、H20.29 percent of O and the balance of ignition loss and impurity components, and the melting point is 1350 ℃; and packaging qualified products and warehousing.
The tundish covering agent is used in the steelmaking continuous casting process of a certain steel enterprise in Tangshan, and the process parameters are as follows: the tundish capacity is 35 tons, the steel grade is W780QX high-aluminum dual-phase steel, and each casting time is about 9 hours, the tundish covering agent needs to be uniformly added into the tundish, the operation of the black surface of the liquid surface is kept, and the liquid surface of the steel cannot be exposed.
In the using process, the covering agent has good spreadability in the steel ladle, no caking phenomenon, uniform and stable slagging, no crusting phenomenon and no erosion of a ladle lining. The finished product sample of the tundish is taken for detection, the problem of molten steel pollution caused by carburetion and the like is avoided, and the using effect is good.
Example 3
Weighing 20 parts by weight of magnesia powder, 43 parts by weight of calcium slag powder, 32 parts by weight of barium aluminate powder, 3 parts by weight of regenerated cryolite powder and 2 parts by weight of binder, placing the materials in a pulping tank, adding water and stirring, wherein the mass ratio of the raw materials to the water is 1: 0.6, strictly controlling and stirring for 35min to prepare mixed slurry; pressurizing the mixed slurry to 1.5Mpa by a plunger pump, and then feeding the mixed slurry into a spray drying tower; setting the temperature in a spray drying tower to be 620 ℃ and the air outlet temperature to be 170 ℃, and carrying out spray granulation; screening out spray granulation particles with the granularity of 20-80 meshes to prepare a tundish covering agent; sampling the tundish covering agent to detect chemical components, wherein the mass percentage of the chemical components is as follows: SiO 22 1.06％、CaO 23.65％、MgO 19.86％、BaO 19.95％、Al2O3 29.01％、Na2O 1.32％、F 1.53％、H20.25% of O, and the balance of ignition loss and impurity components, and the melting point: 1331 deg.C; and packaging qualified products and warehousing.
The tundish covering agent is used in the steelmaking continuous casting process of a certain steel enterprise in Tangshan, and the process parameters are as follows: the volume of the tundish is 40 tons, the steel type is X80 pipeline steel, and the tundish covering agent needs to be uniformly added into the tundish every time of casting for about 14 hours, so that the operation of the black surface of the liquid surface is kept, and the liquid surface of the steel cannot be exposed.
In the using process, the covering agent has good spreadability in the steel ladle, no caking phenomenon, uniform and stable slagging, no crusting phenomenon and no erosion of a ladle lining. The finished product sample of the tundish is taken for detection, the problem of molten steel pollution caused by carburetion and the like is avoided, and the using effect is good.
Example 4
Weighing 18 parts of magnesia powder, 37 parts of calcium slag powder, 41 parts of barium aluminate powder, 2 parts of regenerated cryolite powder and 2 parts of binder, placing the materials in a pulping tank, adding water and stirring, wherein the mass ratio of the raw materials to the water is 1: 0.7, strictly controlling the stirring for 38min, preparing and mixingSlurry; pressurizing the mixed slurry to 1.7Mpa by a plunger pump, and then feeding the mixed slurry into a spray drying tower; setting the temperature in a spray drying tower to be 680 ℃ and the air outlet temperature to be 185 ℃, and carrying out spray granulation; screening out spray granulation particles with the granularity of 20-80 meshes to prepare a tundish covering agent; sampling the tundish covering agent to detect chemical components, wherein the mass percentage of the chemical components is as follows: SiO 22 0.92％、CaO 20.25％、MgO 17.75％、BaO 25.25％、Al2O3 30.47％、Na2O 1.09％、F 1.27％、H20.28% of O, the balance of ignition loss and impurity components, and the melting point: 1318 deg.C; and packaging qualified products and warehousing.
The tundish covering agent is used in the steelmaking continuous casting process of a certain steel enterprise, and the process parameters are as follows: the tundish capacity is 40 tons, the steel grade is 15CrMoG steel, and the tundish covering agent needs to be uniformly added into the tundish every 15 hours of casting, the operation of the black surface of the liquid level is kept, and the liquid level of the steel cannot be exposed.
In the using process, the covering agent has good spreadability in the steel ladle, no caking phenomenon, uniform and stable slagging, no crusting phenomenon and no erosion of a ladle lining. The finished product sample of the tundish is taken for detection, the problem of molten steel pollution caused by carburetion and the like is avoided, and the using effect is good.
Example 5
Weighing 8 parts of magnesia powder, 58 parts of calcium slag powder, 29 parts of barium aluminate powder, 1 part of regenerated cryolite powder and 3 parts of binder, placing the materials in a pulping tank, adding water and stirring, wherein the mass ratio of the raw materials to the water is 1: 0.65, strictly controlling and stirring for 42min, and preparing mixed slurry; pressurizing the mixed slurry to 1.8Mpa by a plunger pump, and then feeding the mixed slurry into a spray drying tower; setting the temperature in a spray drying tower to be 720 ℃, and the air outlet temperature to be 190 ℃, and carrying out spray granulation; screening out spray granulation particles with the granularity of 20-80 meshes to prepare a tundish covering agent; sampling the tundish covering agent to detect chemical components, wherein the mass percentage of the chemical components is as follows: SiO 22 1.14％、CaO 30.76％、MgO 8.56％、BaO 17.69％、Al2O3 34.04％、Na2O 0.44％、F 0.51％、H20.30 percent of O, the balance of ignition loss and impurity components, and the melting point of 1285 ℃; qualified productAnd (6) packaging and warehousing.
The tundish covering agent is used in the steelmaking continuous casting process of a certain steel enterprise in Liuzhou, Guangxi, and the process parameters are as follows: the volume of the tundish is 30 tons, the steel type is SPA-H steel, and the tundish covering agent needs to be uniformly added into the tundish every time of pouring for about 16 hours, so that the operation of the black surface of the liquid surface is kept, and the liquid surface of the steel cannot be exposed.
In the using process, the covering agent has good spreadability in the steel ladle, no caking phenomenon, uniform and stable slagging, no crusting phenomenon and no erosion of a ladle lining. The finished product sample of the tundish is taken for detection, the problem of molten steel pollution caused by carburetion and the like is avoided, and the using effect is good.
Example 6
The tundish covering agent comprises the following chemical components in percentage by mass: SiO 22 0.99％、CaO 24.75％、MgO 24.43％、BaO 15.86％、Al2O3 27.70％、Na2O 1.33％、F 1.53％、H20.35 percent of O, and the balance of ignition loss and impurity components; melting point: 1350 ℃.
The tundish covering agent comprises the following raw materials: 25 parts of magnesia powder, 45 parts of calcium slag powder, 26 parts of barium aluminate powder, 3 parts of regenerated cryolite powder and 1.5 parts of binder.
The preparation method is shown in example 1.
Comparative example 1
The difference from example 1 is: barium carbonate and alumina powder are used for replacing barium aluminate powder, and the specific preparation method comprises the following steps:
weighing 10 parts of magnesia powder, 69 parts of calcium slag powder, 11 parts of barium carbonate, 5 parts of alumina powder, 2 parts of regenerated cryolite powder and 3 parts of binder, placing the materials in a pulping tank, adding water and stirring, wherein the mass ratio of the raw materials to the water is 1: 0.7, strictly controlling and stirring for 45min to prepare mixed slurry; pressurizing the mixed slurry to 1.8Mpa by a plunger pump, and then feeding the mixed slurry into a spray drying tower; setting the temperature in a spray drying tower to be 800 ℃, the air outlet temperature to be 200 ℃, and carrying out spray granulation; screening out spray granulation particles with the granularity of 20-80 meshes to prepare a tundish covering agent; sampling the tundish covering agent to detect chemical components, wherein the mass percentage of the chemical components is as follows: siO21.53％、CaO 36.57％、MgO 10.54％、BaO 6.74％、Al2O335.54％、Na2O 1.32％、F 1.53％、H20.30 percent of O, and the balance of ignition loss and impurity components; melting point: 1343 deg.C; and packaging qualified products and warehousing.
The tundish covering agent is used in the steelmaking continuous casting process of Sichuan iron and steel enterprises, and the process parameters are the same as those in the embodiment 1.
In the using process, the using effect of the covering agent is basically equivalent to that of the embodiment 1, but compared with the embodiment 1, the temperature of the tundish using the covering agent is reduced too fast to reach 0.8 ℃/min, and the heat preservation effect is obviously reduced.
Comparative example 2
Weighing 8 parts of magnesia powder, 53 parts of calcium slag powder, 29 parts of barium aluminate powder, 7 parts of regenerated cryolite powder and 3 parts of binder, placing the materials in a pulping tank, adding water and stirring, wherein the mass ratio of the raw materials to the water is 1: 0.7, strictly controlling and stirring for 45min to prepare mixed slurry; pressurizing the mixed slurry to 1.8Mpa by a plunger pump, and then feeding the mixed slurry into a spray drying tower; setting the temperature in a spray drying tower to be 800 ℃, the air outlet temperature to be 200 ℃, and carrying out spray granulation; screening out spray granulation particles with the granularity of 20-80 meshes to prepare a tundish covering agent; sampling the tundish covering agent to detect chemical components, wherein the mass percentage of the chemical components is as follows: SiO 22 1.14％、CaO 28.09％、MgO 8.40％、BaO 17.69％、Al2O3 33.06％、Na2O 3.08％、F 3.57％、H20.32 percent of O, and the balance of ignition loss and impurity components; melting point: 1245 deg.C; and packaging qualified products and warehousing.
The tundish covering agent is used in the steelmaking continuous casting process of Sichuan iron and steel enterprises, and the process parameters are the same as those in the embodiment 1.
The use effect of the covering agent during use is substantially equivalent to that of example 1, but compared to example 1, there is a problem that the lining and stopper are significantly eroded as the casting proceeds.
The above cases and the application results show that the CaO-BaO-MgO-Al of the invention2O3The quaternary slag system tundish covering agent is based on the originalThe obtained covering agent has higher alkalinity and good impurity adsorption capacity; the melting point is moderate, and the melting point is stably maintained within the range of 1280-1350 ℃, so that the excellent slag effect is ensured; the fluxing agent is low in adding amount, does not corrode a lining, can avoid the problems of sintering, crusting and the like by matching with proper melting temperature, and does not generate the phenomena of carbureting, siliconizing and the like polluting molten steel.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. CaO-BaO-MgO-Al2O3The quaternary slag system tundish covering agent is characterized in that: the feed is prepared from the following raw materials: 8-25 parts of magnesia powder, 37-69 parts of calcium slag powder, 16-41 parts of barium aluminate powder, 1-3 parts of regenerated cryolite powder and 1.5-3 parts of binder.
2. CaO-BaO-MgO-Al according to claim 12O3The quaternary slag system tundish covering agent is characterized in that: the particle sizes of the magnesite powder, the calcium slag powder, the barium aluminate powder and the regenerated cryolite powder are all below 100 meshes.
3. CaO-BaO-MgO-Al according to claim 1 or 22O3The quaternary slag system tundish covering agent is characterized in that: the barium aluminate powder is prepared by the following method: mixing barium carbonate and alumina powder according to a mass ratio of 2: 1, putting the mixture into an electric arc furnace, heating to 1500 +/-20 ℃ to completely melt the mixture into liquid, pouring out the liquid, cooling to normal temperature, crushing the liquid into blocks with the particle size of less than or equal to 50mm, and processing the blocks into powder with the 100-mesh passing rate of more than or equal to 95 percent by a ball mill.
4. CaO-BaO-MgO-Al according to claim 32O3Quaternary slag system intermediateThe coating covering agent is characterized in that: the calcium slag powder is a waste material for producing metal calcium by a thermal reduction method; the regenerated cryolite powder is a byproduct in the electrolytic aluminum industry.
5. CaO-BaO-MgO-Al according to any one of claims 1 to 42O3The quaternary slag system tundish covering agent is characterized in that: the effective chemical components of the material by mass percent are as follows: SiO 22≤1.5％、CaO 20.0～40.0％、MgO 8.5～24.5％、BaO 11.5～25.5％、Al2O3 27.5～34.0％、Na2O≤1.5％、F≤1.5％、H2O is less than or equal to 0.35 percent, and the balance is ignition loss and impurity components.
6. CaO-BaO-MgO-Al according to claim 52O3The quaternary slag system tundish covering agent is characterized in that: the binder is sodium carboxymethyl cellulose.
7. CaO-BaO-MgO-Al according to claim 62O3The preparation method of the quaternary slag system tundish covering agent is characterized by comprising the following steps: the method sequentially comprises the following steps: mixing slurry, spraying granulation, screening and dedusting, detecting products, packaging and warehousing.
8. CaO-BaO-MgO-Al according to claim 72O3The preparation method of the quaternary slag system tundish covering agent is characterized by comprising the following steps: the mixed pulping step specifically comprises the following steps: respectively weighing magnesia powder, calcium slag powder, barium aluminate powder, regenerated cryolite powder and a binder according to the parts by weight, placing the materials in a pulping tank, adding water, and stirring to prepare mixed slurry;
strictly controlling and stirring for 30-45 min to ensure the uniformity of the slurry and prevent hydration;
preferably, the mass ratio of the raw material to the water is controlled to be 1: 0.6-1: 0.7.
9. CaO-BaO-MgO-Al according to claim 82O3The preparation method of the quaternary slag system tundish covering agent is characterized by comprising the following steps: what is needed isThe spray granulation step specifically comprises: pressurizing the mixed slurry to 1.5-1.8 Mpa by a plunger pump, and allowing the mixed slurry to enter a spray drying tower for spray granulation;
preferably, the temperature in the spray drying tower is 600-800 ℃, and the air outlet temperature is 150-200 ℃.
10. CaO-BaO-MgO-Al according to claim 92O3The preparation method of the quaternary slag system tundish covering agent is characterized by comprising the following steps: the screening and dust removing steps are as follows: and screening spray granulation particles with the granularity of 20-80 meshes to prepare the tundish covering agent.
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| CN1786208A (en) * | 2005-10-24 | 2006-06-14 | 安徽工业大学 | Barium titanium cinder used for denitregen and its denitrogen method |
| CN102031337A (en) * | 2010-12-20 | 2011-04-27 | 昆明理工大学 | RH (Relative Humidity) desulfurizer with low melting point |
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