CN116768608A - Semi-brittle corundum and preparation method thereof - Google Patents
Semi-brittle corundum and preparation method thereof Download PDFInfo
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- CN116768608A CN116768608A CN202310857767.5A CN202310857767A CN116768608A CN 116768608 A CN116768608 A CN 116768608A CN 202310857767 A CN202310857767 A CN 202310857767A CN 116768608 A CN116768608 A CN 116768608A
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- 229910052593 corundum Inorganic materials 0.000 title claims abstract description 47
- 239000010431 corundum Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 6
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 5
- 229910001570 bauxite Inorganic materials 0.000 claims description 28
- 238000003723 Smelting Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 12
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical group C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 4
- 239000003830 anthracite Substances 0.000 description 4
- 239000008395 clarifying agent Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the technical field of semi-brittle corundum, in particular to semi-brittle corundum and a preparation method thereof, wherein the semi-brittle corundum comprises the following components in percentage by mass: al (Al) 2 O 3 ≥96.5wt％，TiO 2 1.5‑1.9wt％，SiO 2 0.1‑0.5wt％，Fe 2 O 3 0.2‑0.3wt％，ZrO 2 0.05 to 0.12wt%, which also includes Cr 2 O 3 0.1 to 0.3 weight percent, and the contents of the components are as follows: axFe 2 O 3 =b×Cr 2 O 3 +c×ZrO 2 C=0.125-0.9, a=0.4-0.5, b=0.3-0.45. The invention can form a specific crystal structure and physical network distribution which are beneficial to grinding, thereby remarkably improving grindingThe cutting ratio and the service life are high, the processing efficiency is high, the processing quality is good, and the grinding effect is excellent.
Description
Technical Field
The invention relates to the technical field of semi-brittle corundum, in particular to semi-brittle corundum and a preparation method thereof.
Background
Semi-brittle corundum is an abrasive with extremely wide application, and is called semi-brittle corundum, namely TiO because the brittleness of the semi-brittle corundum is between that of white corundum and brown corundum 2 The content of the semi-brittle corundum is lower than that of brown corundum, so the semi-brittle corundum is also called as low-titanium corundum and is classified into slow corundum according to different cooling speeds of corundum meltCold semi-brittle corundum and quenched semi-brittle corundum. In the prior art, various technologies for preparing semi-brittle corundum exist, but the performance requirements of the semi-brittle corundum in the application market are higher and higher.
CN109181642B discloses a semi-brittle corundum abrasive and a preparation method thereof. The semi-brittle corundum abrasive material comprises the following components in percentage by mass: al (Al) 2 O 3 >97％，TiO 2 1.3-2.1％，SiO 2 0.2-0.4％，Fe 2 O 3 0.09-0.35％，ZrO 2 Less than or equal to 0.15 percent. The semi-brittle corundum abrasive prepared by the method has the advantages of high durability, high grinding ratio and high processing efficiency, good processing surface quality and excellent grinding effect. However, the grinding ratio and the service life still cannot meet the requirements of more severe application fields, and the performance of the grinding machine needs to be further improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the semi-brittle corundum and the preparation method thereof, and the semi-brittle corundum has the special composition, is beneficial to remarkably improving the grinding ratio and prolonging the service life.
In order to achieve the above purpose, the first aspect of the present invention provides a semi-brittle corundum, comprising the following components in percentage by mass: al (Al) 2 O 3 ≥96.5wt％，TiO 2 1.5-1.9wt％，SiO 2 0.1-0.5wt％，Fe 2 O 3 0.2-0.3wt％，ZrO 2 0.05-0.12wt% and Cr 2 O 3 0.1 to 0.3 weight percent, and the contents of the components are as follows: axFe 2 O 3 =b×Cr 2 O 3 +c×ZrO 2 ，c=0.125-0.9，a=0.4-0.5，b=0.3-0.45。
Preferably, a=0.4, b=0.35-0.39.
More preferably, al 2 O 3 97.5-98wt%.
Preferably, a=0.5, b=0.42-0.45.
More preferably, al 2 O 3 96.5-97.5wt%.
Preferably, cr of the present invention 2 O 3 0.1-0.15wt％。
The invention is thatPreferably, zrO 2 0.08-0.12wt％。
According to a second aspect of the invention, there is provided a method for preparing semi-brittle corundum according to the first aspect, comprising: smelting bauxite-containing raw materials under the conditions of a reducing agent and a clarifying agent, and then cooling and crushing.
Preferably, the reducing agent is anthracite.
Preferably, the clarifier is scrap iron.
The inventor of the invention has found through a great deal of research that the semi-brittle corundum abrasive provided by the invention has the specific composition, especially Cr is added 2 O 3 0.1 to 0.3wt% and controlled to satisfy: axFe 2 O 3 =b×Cr 2 O 3 +c×ZrO 2 C=0.125-0.9, a=0.4-0.5, b=0.3-0.45, which can form a specific crystal structure and physical network distribution favorable for grinding, thereby remarkably improving the grinding ratio and the service life, and having high processing efficiency, good processing quality and excellent grinding effect. Under the same conditions, if Cr is not added 2 O 3 Or does not satisfy aXFe 2 O 3 =b×Cr 2 O 3 +c×ZrO 2 The grinding ratio and the service life can be influenced; if a is higher than 0.5 or b is higher than 0.45, the grinding ratio is lowered, and if a is lower than 0.5 or b is lower than 0.35, the service life is lowered.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The first aspect of the invention provides semi-brittle corundum, which comprises the following components in percentage by mass: al (Al) 2 O 3 ≥96.5wt％，TiO 2 1.5-1.9wt％，SiO 2 0.1-0.5wt％，Fe 2 O 3 0.2-0.3wt％，ZrO 2 0.05-0.12wt% and Cr 2 O 3 0.1 to 0.3 weight percent, and the contents of the components are as follows: axFe 2 O 3 =b×Cr 2 O 3 +c×ZrO 2 ，c=0.125-0.9，a=0.4-0.5，b=0.3-0.45。
Preferably, a=0.4, b=0.35-0.39. In the preferred scheme, the grinding ratio and the service life are further improved.
In the above scheme of a=0.4, more preferably, al 2 O 3 97.5-98wt%.
Preferably, a=0.5, b=0.42-0.45. In the preferred scheme, the grinding ratio and the service life are further improved.
In the above scheme of a=0.5, more preferably, al 2 O 3 96.5-97.5wt%.
Preferably, cr of the present invention 2 O 3 0.1-0.15wt%. In the preferred scheme, the service life is further prolonged.
Preferably, the invention provides ZrO 2 0.08-0.12wt%. In this preferred embodiment, further grinding ratios are facilitated.
According to a second aspect of the invention, there is provided a method for preparing semi-brittle corundum according to the first aspect, comprising: smelting bauxite-containing raw materials under the conditions of a reducing agent and a clarifying agent, and then cooling and crushing.
The raw materials of the bauxite of the present invention may be any materials which can be selected by those skilled in the art according to the prior art, as long as the above-mentioned semi-brittle corundum composition can be obtained. The invention is improved in the composition regulation of semi-brittle corundum, and has no improvement on the preparation method, so long as the semi-brittle corundum with the required composition is obtained according to the method in the prior art. The raw materials of bauxite include, for example, bauxite (composition as in CN 109181642B), bauxite (composition as in CN 109181642B) and high bauxite, or bauxite (composition as in CN 109181642B) and high bauxite. The composition of the high alumina chromite may include, for example: cr in terms of mass content 2 O 3 30-35wt％，Al 2 O 3 20-30wt％，MgO 25-29wt％。
In a preferred embodiment of the present invention, the raw materials of the bauxite include bauxite and high bauxite chromite, the mass ratio of the bauxite to the high bauxite is 2-5:1, and the composition of the high bauxite includes Cr in terms of mass content 2 O 3 30-35wt％，Al 2 O 3 20-30wt% and 25-29wt% of MgO. In the preferred scheme, the semi-brittle corundum composition is more favorable for obtaining the semi-brittle corundum under the condition of obviously removing impurities, and the grinding ratio is further improved.
Further preferably, the smelting process comprises: firstly smelting for 2.5-3.5h at 1150-1250 ℃, then smelting for 3-5h at 1450-1550 ℃, and then smelting for 3-5h at 1900-2000 ℃. In the preferred scheme of the invention, the impurity is more easily removed obviously, and the service life is further prolonged.
Preferably, the reducing agent is anthracite.
Preferably, the clarifier is scrap iron.
The present invention will be described in detail by examples. The method for detecting the composition of the semi-brittle corundum is carried out according to CN 109181642B.
Example 1
The semi-brittle corundum comprises the following raw materials in percentage by mass: tiO (titanium dioxide) 2 1.6wt％，SiO 2 0.2wt％，Fe 2 O 3 0.2wt％，ZrO 2 ，Cr 2 O 3 0.1wt% of the balance Al 2 O 3 And the content of each component is as follows: axFe 2 O 3 =b×Cr 2 O 3 +c×ZrO 2 ，c=0.9，a=0.4，b=0.35。
The preparation method comprises the following steps: smelting bauxite-containing raw materials under the conditions of a reducing agent and a clarifying agent, wherein the smelting process comprises the following steps of: firstly smelting at 1250 ℃ for 2.5 hours, then smelting at 1450 ℃ for 3 hours, and then smelting at 1950 ℃ for 4 hours; and then cooling and crushing. The bauxite-containing raw materials comprise bauxite and high-alumina chromite, the mass ratio of the bauxite to the high-alumina chromite is 3.5:1, and the composition of the high-alumina chromite (produced by Sichuan) comprises Cr in terms of mass content 2 O 3 30-35wt％，Al 2 O 3 20-30wt% and 25-29wt% of MgO. The reducing agent is anthracite, and the mass ratio of the anthracite to the raw materials is 1:60. The clarifying agent is scrap iron, and the mass ratio of the scrap iron to the raw materials is 1:20.
Example 2
The procedure is as in example 1, except that Fe is regulated 2 O 3 0.3wt％，ZrO 2 ，Cr 2 O 3 0.3wt%, c=0.125, a=0.5, b=0.45, by Al 2 O 3 Supplementing 100%. The mass ratio of bauxite to high alumina chromite is correspondingly regulated to be 3:1.
Example 3
The procedure is as in example 2, except that Fe is regulated 2 O 3 0.3wt％，ZrO 2 ，Cr 2 O 3 0.3wt%, c=0.45, a=0.5, b=0.35, by Al 2 O 3 Supplementing 100%. The mass ratio of bauxite to high alumina chromite is correspondingly regulated to be 3.2:1.
Example 4
The procedure of example 2 was followed, except that the smelting process was: smelting at 1450 deg.c for 3 hr and then at 1950 deg.c for 4 hr.
Example 5
The procedure of example 2 was followed, except that the smelting process was: smelting at 1950 ℃ for 7 hours.
Example 6
The procedure is as in example 2, except that Fe is regulated 2 O 3 0.3wt％，ZrO 2 ，Cr 2 O 3 0.2wt%, c=0.45, a=0.5, b=0.35, by Al 2 O 3 Supplementing 100%.
Comparative example 1
The procedure is as in example 2, except that no ZrO is introduced 2 And Cr (V) 2 O 3 。
Comparative example 2
The procedure is as in example 2, except that Cr is not introduced 2 O 3 。
Test case
The above examples and comparative examples were subjected to performance test according to test examples 1-2 in CN109181642B, and the results are shown in table 1. Wherein the data of each example, comparative example 2 is the improvement data compared to comparative example 1, specifically (data of the corresponding example-data of comparative example 1)/data of comparative example 1.
TABLE 1
It can be seen from the results of table 1 that the examples according to the present invention have significantly better effects.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (10)
1. The semi-brittle corundum comprises the following components in percentage by mass: al (Al) 2 O 3 ≥96.5wt％，TiO 2 1.5-1.9wt％，SiO 2 0.1-0.5wt％，Fe 2 O 3 0.2-0.3wt％，ZrO 2 0.05 to 0.12 weight percent, characterized by also comprising Cr 2 O 3 0.1 to 0.3 weight percent, and the contents of the components are as follows: axFe 2 O 3 =b×Cr 2 O 3 +c×ZrO 2 ，c=0.125-0.9，a=0.4-0.5，b=0.3-0.45。
2. Semi-brittle corundum according to claim 1 characterized in that a=0.4 and b=0.35-0.39.
3. Semi-brittle corundum according to claim 2 characterized in that Al 2 O 3 97.5-98wt%.
4. Semi-brittle corundum according to claim 1 characterized in that a=0.5 and b=0.42-0.45.
5. Semi-brittle corundum according to claim 4 characterized in that Al 2 O 3 96.5-97.5wt%.
6. Semi-brittle corundum according to claim 1 characterized in that Cr 2 O 3 0.1-0.15wt％。
7. Semi-brittle corundum according to claim 1 characterized by ZrO 2 0.08-0.12wt％。
8. A method for the preparation of semi-brittle corundum according to any of claims 1-7 characterized in that the bauxite-containing raw material is smelted under reducing and clarifying conditions, then cooled and crushed.
9. The production method according to claim 8, wherein the raw material of the bauxite comprises bauxite and high bauxite chromite, the mass ratio of the bauxite to the high bauxite is 2-5:1, and the composition of the high bauxite comprises Cr in terms of mass content 2 O 3 30-35wt％，Al 2 O 3 20-30wt％，MgO 25-29wt％。
10. The method of claim 9, wherein the smelting process comprises: firstly smelting for 2.5-3.5h at 1150-1250 ℃, then smelting for 3-5h at 1450-1550 ℃, and then smelting for 3-5h at 1900-2000 ℃.
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