CN114890803A - Preparation method of high-temperature oxide melt containing superoxide radical - Google Patents
Preparation method of high-temperature oxide melt containing superoxide radical Download PDFInfo
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- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 30
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000012300 argon atmosphere Substances 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 60
- 239000000395 magnesium oxide Substances 0.000 claims description 33
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910002804 graphite Inorganic materials 0.000 claims description 16
- 239000010439 graphite Substances 0.000 claims description 16
- 238000000498 ball milling Methods 0.000 claims description 15
- 229910052697 platinum Inorganic materials 0.000 claims description 11
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 239000010431 corundum Substances 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 5
- 238000003621 hammer milling Methods 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 238000001238 wet grinding Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000003795 desorption Methods 0.000 abstract 1
- 230000009257 reactivity Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 7
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910003849 O-Si Inorganic materials 0.000 description 2
- 229910003872 O—Si Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 125000003010 ionic group Chemical group 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910014472 Ca—O Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010024769 Local reaction Diseases 0.000 description 1
- 229910019092 Mg-O Inorganic materials 0.000 description 1
- 229910019395 Mg—O Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005844 autocatalytic reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 1
- 238000010902 jet-milling Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000007725 thermal activation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/057—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on calcium oxide
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- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
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Abstract
The invention discloses a preparation method of a high-temperature oxide melt containing superoxide radicals, which is characterized by comprising the following steps: according to CaO: 30 to 60 wt% of Al 2 O 3 ：20～35wt％，MgO：0～15wt％，SiO 2 ：8～15wt％，Fe 2 O 3 : 0-10 wt% of the components, uniformly mixing by using a mixing and grinding method, putting the mixture into a crucible, putting the crucible into a high-temperature furnace in air or argon atmosphere, heating to 1500-1700 ℃ to melt the mixture, and keeping the temperature to obtain a high-temperature oxide melt containing rich superoxide radicals; by changing CaO, MgO and Fe 2 O 3 The content of the superoxide radical can be regulated to 1.007 × 10 ‑5 mol/g to 9.078X 10 ‑5 In the mol/g range. The high-temperature oxide melt has high reactivity and high solubilityFast impurity desorption and high molten steel purifying capacity.
Description
Technical Field
The invention belongs to the technical field of high-temperature melts, and particularly relates to a preparation method of a high-temperature oxide melt containing superoxide radicals.
Background
The high-temperature oxide melt is widely used in the fields of metallurgy and building materials, such as cement and glass synthesis, 3D ceramic printing, geology and the like. Such asIn the ferrous metallurgy industry, CaO-Al is generally adopted 2 O 3 -SiO 2 The system melt plays a role in absorbing impurities and purifying molten steel. The metallurgical properties of the oxide melt are closely related to its structure. At present, there are four main slag structure theories or hypotheses, which are a molecular structure theory, an ionic structure theory, an ion-molecule coexistence theory and a polymer theory, respectively. In none of these structural theories, the existence of free radicals is mentioned, and the free radicals (including singlet oxygen, superoxide radical, hydroxyl radical, etc.) widely exist in the research of organic chemistry such as photocatalysis, biomaterials, and medicinal chemistry, and have important influence on the reaction activity. Therefore, the exploration of the high-temperature oxide melt containing the free radicals and the regulation and control method thereof are urgently needed, which have important significance for the production of high-quality clean steel and provide reference for geological research and other related fields.
Disclosure of Invention
The invention provides a preparation method of a high-temperature oxide melt containing superoxide radicals, which is characterized in that CaO, MgO and Fe2O in high-temperature oxide components are subjected to reaction 3 The content of the superoxide radical can be adjusted and controlled by adjusting the content of the superoxide radical, the specific technical scheme is as follows,
according to CaO: 30 to 60 wt% of Al 2 O 3 ：20～35wt％，MgO：0～15wt％，SiO 2 ：8～15 wt％，Fe 2 O 3 : 0-10 wt% of a mixture is formed, and the mixture is uniformly mixed by using a mixing and grinding method; and putting the mixture into a crucible, putting the crucible into a high-temperature furnace in an air or argon atmosphere, heating to 1500-1700 ℃ to melt the mixture, and preserving the temperature to form a high-temperature oxide melt containing the superoxide radical. By varying the CaO, MgO or Fe in the mixture 2 O 3 The mass fraction of (a) regulates the content of superoxide radicals in the high-temperature oxide melt. The content of superoxide radical in the high-temperature oxide melt is 1.007 × 10 -5 mol/g to 9.078X 10 -5 mol/g。
Further, the content of superoxide radical in the above high-temperature oxide melt was 1.007X 10 by varying the CaO mass fraction within a range of 50 to 60 wt% -5 mol/g to 9.078X 10 -5 mol/g。
Further, the content of superoxide radical in the high-temperature oxide melt was 1.746X 10 by varying the MgO mass fraction in the range of 0 to 13 wt% -5 mol/g to 3.87X 10 -5 mol/g。
Further, Fe is changed within the range of 0 to 10 wt% 2 O 3 The content of superoxide radical in the high-temperature oxide melt is 1.648 multiplied by 10 -5 To 3.864 × 10 -5 mol/g。
Further, Al in the above mixture 2 O 3 、SiO 2 CaO, MgO or Fe 2 O 3 The purity is more than or equal to 98wt percent and the granularity is less than or equal to 88 mu m.
Further, CaCO is used as the CaO 3 。
Further, the mixing and grinding method is planetary ball milling, vibration milling, air flow milling, hammer milling or wet milling.
Further, the crucible is a platinum crucible, a graphite crucible, a corundum crucible or a magnesium oxide crucible.
Compared with the prior art, the invention has the following beneficial effects:
the invention is to CaO, MgO and Fe in the high-temperature oxide component 2 O 3 The content of the oxygen radicals can be regulated and controlled by regulating the content of the oxygen radicals, and the high-temperature oxide melt prepared by the method has the advantages of high reaction activity, high speed of dissolving and absorbing impurities, strong molten steel purifying capacity and the like.
The oxide melt structure in the invention forms a plurality of complexes at high temperature, and simultaneously, the temperature and CaO, MgO and Fe are regulated and controlled 2 O 3 The content of the free oxygen can be regulated and controlled to release different contents of free oxygen, the two lone pair electrons in the original parallel spins of the free oxygen in the melt are opposite in spins under the high-temperature thermal activation, a plurality of singlet oxygen are generated in the oxide melt, and the singlet oxygen can capture electrons of ionic groups in the melt (such as [ SiO ] 4 ] 4- ，[Si 2 O 7 ] 6- ，[Si 2 O 6 ] 4- ，[Si 2 O 5 ] 2- ，[AlO 4 ] 5- Al-O-Si, ferritetrahedron, octahedronSi-O-Si, Ca-O, Mg-O), are converted to superoxide radicals, all provoking multiple local reaction perturbations within the system. At the same time, the superoxide radical will lose electrons and convert into singlet oxygen, the singlet oxygen and superoxide radical are converted into each other, and the formula of the autocatalysis reaction is
(wherein A is the above-mentioned ionic group), the activity of the oxide melt can be greatly improved by the nonlinear reaction of singlet oxygen and superoxide radical, so that the high-temperature oxide melt has the advantages of high reaction activity, fast inclusion dissolution and absorption, strong molten steel purification capability and the like.
Detailed Description
The invention will be further described with reference to specific embodiments:
firstly, according to CaO: 30 to 60 wt% of Al 2 O 3 ：20～35wt％，MgO：0～15wt％，SiO 2 ： 8～15wt％，Fe 2 O 3 : 0-1 Owt% of Al in the mixture 2 O 3 、 SiO 2 CaO, MgO or Fe 2 O 3 The purity is more than or equal to 98wt percent and the granularity is less than or equal to 88 mu m. And uniformly mixing the mixture by using a mixing and grinding method, wherein the mixing and grinding method is planetary ball milling, vibration milling, jet milling, hammer milling or wet milling.
The mixture is then placed in a crucible, which may be selected from a platinum crucible, a graphite crucible, a corundum crucible, or a magnesium oxide crucible. Then the crucible is put into a high temperature furnace with air or argon atmosphere, and the temperature is raised to 1500 ℃ to 1700 ℃ to melt and preserve the temperature, so as to form a high temperature oxide melt containing superoxide radicals.
By varying the content of CaO, MgO or Fe in the above mixture 2 O 3 The content of the superoxide radical in the high-temperature oxide melt is regulated and controlled by the mass fraction, the content of the superoxide radical is detected by using an electron spin spectrometer (ESR), the quenching mode is that the quenching slag is poured on a copper plate for circulating water cooling for quenching, the quenching rate is 200-400 ℃/s, and the content of the superoxide radical in the high-temperature oxide melt is measured and obtained1.007×10 -5 mol/g to 9.078X 10 -5 mol/g. The CaO mass fraction is changed within the range of 50-60 wt%, and the content of superoxide radical in the high-temperature oxide melt is 1.007 x 10 -5 mol/g to 9.078X 10 -5 mol/g. Changing MgO mass fraction in the range of 0-13 wt%, the content of superoxide radical in the high temperature oxide melt is 1.746 × 10 -5 mol/g to 3.87X 10 -5 mol/g. Varying Fe in the range of 0-10 wt% 2 O 3 The mass fraction of the superoxide radical in the high-temperature oxide melt is 1.648 multiplied by 10 -5 To 3.864 × 10 -5 mol/g。
Example 1
In this example, according to Al 2 O 3 ：34～36wt％，SiO 2 : 11-15 wt%, CaO: mixing 50-60 wt% of the raw materials by a ball milling method, putting the mixture into a graphite crucible, putting the graphite crucible into a high-temperature furnace in an argon atmosphere, heating to 1500 ℃ to melt the mixture, and keeping the temperature to obtain a high-temperature oxide melt containing superoxide radicals;
in this example, the content of the high temperature oxide melt containing a superoxide radical was changed from 1.007X 10 by changing the content of CaO therein from 50 to 60 wt% -5 mol/g to 4.92X 10 -5 mol/g。
Example 2
In this example, according to Al 2 O 3 ：34～36wt％，SiO 2 : 8-11 wt%, CaO: mixing 30-50 wt% of the raw materials by a ball milling method, putting the mixture into a platinum crucible, putting the platinum crucible into a high-temperature furnace in an argon atmosphere, heating to 1600 ℃, melting and preserving heat to obtain a high-temperature oxide melt containing rich superoxide radicals; the content of the superoxide radical in the active carbon can be regulated from 2.68X 10 by changing the content of CaO in the active carbon from 50 to 60wt percent -5 mol/g to 9.078X 10 - 5 mol/g。
Example 3
In this example, the ratio of MgO: 1 to 5 wt% of Al 2 O 3 ：34～30wt％，SiO 2 : 12-14 wt%, CaO: 50-53 wt%, mixing by ball milling method,putting the mixture into a graphite crucible, putting the graphite crucible into a high-temperature furnace, heating to 1600 ℃ to melt the mixture and preserving the temperature to obtain a high-temperature oxide melt containing rich superoxide radicals;
in this example, the superoxide radical decreased gradually from 2.048X 10 by changing the MgO content therein from 1 to 5 wt% -5 mol/g to 1.746X 10 -5 mol/g。
Example 4
In this example, the ratio of MgO: 5 to 8 wt% of Al 2 O 3 ：30～27wt％，SiO 2 : 12-14 wt%, CaO: mixing 51-53 wt% by ball milling method, placing the mixture into a graphite crucible, placing into a high temperature furnace in argon atmosphere, heating to 1600 deg.C for melting and maintaining the temperature, changing MgO content from 5-8 wt%, increasing content of superoxide radical generated from high temperature oxide melt from 1.746 × 10 -5 mol/g to 3.158X 10 -5 mol/g。
Example 5
In this example, the ratio of MgO: 8 to 10 wt% of Al 2 O 3 ：27～25wt％，SiO 2 : 12-14 wt%, CaO: mixing 51-53 wt% by using a ball milling method, putting the mixture into a graphite crucible, placing the graphite crucible into a high-temperature furnace, heating to 1600 ℃, melting and preserving heat. The content of MgO is changed from 8 to 10 wt%, and the content of superoxide radical generated by high-temperature oxide melt is reduced from 3.158 × 10 -5 mol/g to 2.704X 10 -5 mol/g。
Example 6
This example is carried out according to MgO: 10 to 15 wt% of Al 2 O 3 ：25～20wt％，SiO 2 : 12-14 wt%, CaO: mixing 51-53 wt% by using a ball milling method, placing the mixture into a graphite crucible, placing the graphite crucible into a high-temperature furnace in an argon atmosphere, heating to 1700 ℃ to melt the mixture, and keeping the temperature. The content of MgO is changed from 10 to 15 wt%, and the content of superoxide radical generated by high-temperature oxide melt is increased from 2.704X 10 -5 mol/g to 3.87X 10 -5 mol/g。
Example 7
This example is carried out according to MgO: 1 to 15 wt% of Al 2 O 3 ：35～30wt％，SiO 2 : 11-13 wt%, CaO: mixing 45-52 wt% of the raw materials by a ball milling method, putting the mixture into a platinum crucible, putting the platinum crucible into a high-temperature furnace, heating to 1600 ℃, melting and preserving heat. The content of MgO is changed from 1 to 15 wt%, and the content of superoxide radical generated by high-temperature oxide melt is increased and stabilized from 2.078X 10 -5 mol/g to 3.146X 10 -5 mol/g。
Example 8
This example is in accordance with Fe 2 O 3 ：1～10wt％，Al 2 O 3 ：22～35wt％，SiO 2 : 12-13 wt%, CaO: 52 wt%, ball milling to mix, placing the mixture into a platinum crucible, placing the platinum crucible into a high temperature furnace, heating to 1600 ℃ to melt and keeping the temperature. Change of Fe therein 2 O 3 From 1 to 10 wt.%, the content of superoxide radicals generated by the high-temperature oxide melt is increased from 1.648X 10 -5 mol/g to 3.864 × 10 -5 mol/g。
Example 9
This example is carried out according to MgO: 1 to 5 wt% of Fe 2 O 3 ：5wt％，Al 2 O 3 ：30wt％，SiO 2 : 12 wt%, CaO: mixing the components in a proportion of 48 wt% by a ball milling method, putting the mixture into a corundum crucible, putting the corundum crucible into a high-temperature furnace, heating to 1600 ℃, melting and preserving heat. The content of MgO in the high-temperature oxide melt is changed from 1 to 5 wt%, and the content of superoxide radical generated by the high-temperature oxide melt is increased from 2.686 multiplied by 10 -5 mol/g to 3.586X 10 -5 mol/g。
Example 10
This example is performed according to the following MgO: 8 wt% of Fe 2 O 3 ：1～5wt％，Al 2 O 3 ：28wt％，SiO 2 : 12 wt%, CaO: mixing the components in a proportion of 46 wt% by using a ball milling method, putting the mixture into a platinum crucible, putting the platinum crucible into a high-temperature furnace, heating to 1600 ℃, melting and preserving heat. Change of Fe therein 2 O 3 Of (1) containsThe amount is from 1 to 5 wt%, and the content of superoxide radical generated by high-temperature oxide melt is increased from 2.738 × 10 -5 mol/g to 3.078X 10 -5 mol/g。
Example 11
This example is carried out according to MgO: 8 wt% of Fe 2 O 3 ：1～5wt％，Al 2 O 3 ：28wt％，SiO 2 : 12 wt%, CaO: mixing the components in a proportion of 46 wt% by using a ball milling method, putting the mixture into a graphite crucible, placing the graphite crucible into a high-temperature furnace, heating to 1700 ℃ to melt the mixture, and keeping the temperature. Change of Fe therein 2 O 3 From 1 to 5 wt.%, the content of superoxide radicals generated by the high-temperature oxide melt is increased from 1.543 x 10 -5 mol/g to 3.994X 10 -5 mol/g。
Table 1 example 12-example 18 process conditions
As shown in Table 1, examples 12 to 18 further modified MgO and Fe 2 O 3 、Al 2 O 3 、 SiO 2 And CaO in different proportions, mixing by a ball milling method, putting the mixture into a graphite crucible, and placing the graphite crucible into a high-temperature furnace for processing at high temperature to obtain the content determination condition of the superoxide radical generated by the high-temperature oxide melt. Therefore, the technical scheme of the invention can obtain the high-temperature oxide melt containing the superoxide radical and adjust CaO, MgO or Fe 2 O 3 The content changes the content of the superoxide radical, regulates the reaction activity of the high-temperature oxide melt, and the like.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A method for preparing a high-temperature oxide melt containing superoxide radicals is characterized by comprising the following steps:
according to CaO: 30 to 60 wt% of Al 2 O 3 ：20～35wt％，MgO：0～15wt％，SiO 2 ：8～15wt％，Fe 2 O 3 : 0-10 wt% of a mixture is formed, and the mixture is uniformly mixed by using a mixing and grinding method;
and putting the mixture into a crucible, putting the crucible into a high-temperature furnace in an air or argon atmosphere, heating to 1500-1700 ℃ to melt the mixture, and preserving the temperature to form a high-temperature oxide melt containing the superoxide radical.
2. The method of claim 1, wherein the mixture is modified by changing CaO, MgO, or Fe 2 O 3 The mass fraction of (a) regulates the content of superoxide radicals in the high-temperature oxide melt.
3. The method for preparing a high-temperature oxide melt containing superoxide radicals according to claim 2, wherein the content of superoxide radicals in the high-temperature oxide melt is 1.007 x 10 -5 mol/g to 9.078X 10 -5 mol/g。
4. The method for producing a high-temperature oxide melt containing a superoxide radical according to claim 3, wherein the mass fraction of CaO is changed within a range of 50 to 60 wt%, and the content of the superoxide radical in the high-temperature oxide melt is 1.007 x 10 - 5 mol/g to 9.078X 10 -5 mol/g。
5. The method for preparing a high-temperature oxide melt containing superoxide radicals according to claim 3, wherein the MgO mass fraction is changed in the range of 0 to 15 wt%, and the content of superoxide radicals in the high-temperature oxide melt is 1.746 x 10 - 5 mol/g to 3.87X 10 -5 mol/g。
6. According to the rightThe method for preparing a high-temperature oxide melt containing superoxide radicals as claimed in claim 3, wherein Fe is changed within the range of 1-10 wt% 2 O 3 The mass fraction of the superoxide radical in the high-temperature oxide melt is 1.648 multiplied by 10 -5 To 3.864 × 10 -5 mol/g。
7. The method of claim 1, wherein the Al in the mixture is selected from the group consisting of Al, and combinations thereof 2 O 3 、SiO 2 CaO, MgO or Fe 2 O 3 The purity is more than or equal to 98wt percent and the granularity is less than or equal to 88 mu m.
8. The method as claimed in claim 1, wherein CaO is CaCO 3 。
9. The method for preparing a high-temperature oxide melt containing superoxide radicals as claimed in claim 1, wherein: the mixing and grinding method is planetary ball milling, vibration milling, air flow milling, hammer milling or wet milling.
10. The method for preparing a high-temperature oxide melt containing superoxide radicals as claimed in claim 1, wherein: the crucible is a platinum crucible, a graphite crucible, a corundum crucible or a magnesium oxide crucible.
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