CN108484185B - Corundum-calcium hexaluminate with aluminum-chromium slag as main material and preparation method thereof - Google Patents
Corundum-calcium hexaluminate with aluminum-chromium slag as main material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to corundum-calcium hexaluminate with aluminum chromium slag as a main material and a preparation method thereof. The technical scheme is as follows: and (3) mixing the materials according to the mass ratio of the aluminum chromium slag to the limestone of 100: 15-20, and grinding to obtain a mixture. Preserving the heat of the mixture in an electric arc furnace at 1550-1750 ℃, adding coke which accounts for 10-15 wt% of the mixture, and continuing to preserve the heat; removing the scum layer, cooling along with the furnace, and crushing to obtain the granular material. Adding water into the granules, and wet-grinding to obtain wet grinding materials; adding rho-alumina accounting for 5-8 wt% of the wet grinding material into the wet grinding material, mixing, carrying out vacuum mud extrusion molding, and ageing the mixture; and heating to 1000-1100 ℃ in a resistance furnace, preserving heat, and cooling along with the furnace to obtain the corundum-calcium hexaluminate taking the aluminum-chromium slag as the main material. The invention has the characteristics of low production cost, high resource utilization rate, no special requirement on equipment and environmental friendliness; the prepared corundum-calcium hexaluminate with the aluminum-chromium slag as the main material has high density, good sintering performance and high refractoriness.
Description
Technical Field
The present invention belongs to the field of corundum-calcium hexaluminate technology. In particular to corundum-calcium hexaluminate taking aluminum-chromium slag as a main material and a preparation method thereof.
Background
The aluminum chromium slag is slag derived from smelting metal chromium, and the main chemical component of the aluminum chromium slag is Al2O3、Cr2O3And MgO, accompanied by CaO, K2O、TiO2And Fe2O3The impurity components, especially the aluminium chromium slag, contain a certain amount of Cr6+The compound not only seriously pollutes the environment, but also causes certain obstacles to the application thereof. Cr elimination by smelting reduction6+Compound of formula (I), and p-Al2O3And Cr2O3The separation is carried out, and then the main components in the aluminum chromium slag are utilized to prepare the refractory materials such as corundum and the like. The corundum-calcium hexaluminate is a complex phase refractory raw material widely used in the field of refractory materials, has high refractoriness and combines with corundum phase and has high-temperature strengthAnd the thermal conductivity coefficient of calcium hexaluminate is small, so that the high-temperature performances of the corundum-calcium hexaluminate complex phase refractory raw material such as high-temperature creep and refractoriness under load are further improved.
At present, the preparation of corundum-calcium hexaluminate mainly adopts a solid phase sintering method and an electric melting method.
The solid phase sintering method is adopted, which generally takes corundum, activated alumina and calcium-containing salt as main raw materials and calcium aluminate cement as a bonding agent, and the mixture is formed and then is sintered at high temperature. Although the solid phase sintering method can synthesize the corundum-calcium hexaluminate complex phase material by optimizing the mixture ratio and controlling the temperature, the calcium hexaluminate is difficult to sinter and compact due to the flaky or plate shape, and particularly, the intermediate products (calcium aluminate, calcium dialuminate and the like) are more, so that the purity of the material is influenced.
The corundum-calcium hexaluminate composite material is prepared by adopting an electric melting method and mainly taking natural high-alumina bauxite or bauxite and the like as an aluminum source and limestone or hydrated lime and the like as a calcium source, and adjusting the mixture ratio after high-temperature melting. The electric melting method can prepare corundum-calcium hexaluminate complex phase material with high density and good crystallization, but the cost of high-purity natural high-bauxite ore or bauxite is higher, and the impurity content (mainly SiO) of low-grade natural high-bauxite ore or bauxite2) Higher, affects the purity of the corundum-calcium hexaluminate complex phase material, and further reduces the high temperature performance of the material.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of corundum-calcium hexaluminate which takes aluminum chromium slag as a main material and has low production cost, high resource utilization rate, no special requirement on equipment and environmental friendliness; the corundum-calcium hexaluminate prepared by the method and taking the aluminum-chromium slag as the main material has high density, good sintering performance and high refractoriness.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following specific steps:
firstly, mixing materials according to the mass ratio of the aluminum chromium slag to the limestone of 100: 15-20, and carrying out mixed grinding in a ball mill until the granularity is less than or equal to 0.1mm to obtain a mixed material.
Secondly, adding the mixture into an electric arc furnace, preserving heat for 20-30 minutes at 1550-1750 ℃, adding coke which accounts for 10-15 wt% of the mixture into the electric arc furnace, and continuing to preserve heat for 35-60 minutes; and then removing the scum layer, cooling to room temperature along with the furnace, discharging, and crushing to obtain the granular material.
And thirdly, adding water accounting for 20-25 wt% of the particle materials into the particle materials, and carrying out wet grinding in a ball mill until the particle size is less than or equal to 80 mu m to obtain the wet grinding material.
And fourthly, adding rho-alumina accounting for 5-8 wt% of the wet grinding material into the wet grinding material, and mixing for 3-5 minutes to obtain a premix.
Fifthly, adding the premix into a pug mill, extruding and forming in vacuum, and ageing for 12-24 hours; and then placing the mixture in a resistance furnace, heating to 1000-1100 ℃, preserving heat for 2-5 hours, and cooling along with the furnace to obtain the corundum-calcium hexaluminate taking the aluminum-chromium slag as the main material.
The aluminum chromium slag is slag derived from smelting metal chromium by an aluminothermic method, and the aluminum chromium slag mainly comprises the following chemical components: al (Al)2O3The content is 70-80 wt%; cr (chromium) component2O3The content is 5-10 wt%; the MgO content is 5 to 10 wt%.
CaCO of said limestone3The content is more than or equal to 97wt percent.
The C content of the coke is more than or equal to 95 wt%.
Al of the rho-alumina2O3The content is more than or equal to 99 wt%; the particle size of the rho-alumina is 60-80 mu m.
The vacuum pressure of the vacuum mud extrusion is 0.05-0.1 Pa.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
1. the method takes the aluminum-chromium slag derived from smelting chromium metal as a main raw material, and the aluminum-chromium slag is crushed and then fused, so that the impurity components of the aluminum-chromium slag are fully utilized for fluxing, the fused temperature is obviously reduced, no special requirement is required on equipment, and the preparation cost of the corundum-calcium hexaluminate taking the aluminum-chromium slag as a main material is obviously reduced.
2. The invention reduces Al through melting2O3And Cr2O3The separation is carried out, the resource utilization rate is improved, and simultaneously, Cr is eliminated6+Pollution and environmental protection.
3. The invention secondarily sinters the particles after electric smelting reduction and combines a wet grinding-mud extruding process, thereby improving the sintering activity and reducing the sintering reaction temperature; can also eliminate CA and CA2And the purity of the corundum-calcium hexaluminate taking the aluminum chromium slag as the main material is improved by using the intermediate products.
The corundum-calcium hexaluminate prepared by the invention and taking the aluminum chromium slag as the main material is determined as follows: the bulk density is 2.9-3.4 g/cm3(ii) a The apparent porosity is 2-7%; the refractoriness is 1700-1750 ℃.
Therefore, the invention has the characteristics of low production cost, high resource utilization rate, no special requirement on equipment and environmental friendliness; the prepared corundum-calcium hexaluminate with the aluminum-chromium slag as the main material has high density, good sintering performance and high refractoriness.
Detailed Description
The invention is further described with reference to specific embodiments, which do not limit the scope of the invention.
In order to avoid repetition, the following raw materials and related technical parameters related to this specific embodiment are uniformly described, and are not described in detail in the embodiments:
the aluminum chromium slag is slag derived from smelting metal chromium by an aluminothermic method, and the aluminum chromium slag mainly comprises the following chemical components: al (Al)2O3The content is 70-80 wt%; cr (chromium) component2O3The content is 5-10 wt%; the MgO content is 5 to 10 wt%.
CaCO of said limestone3The content is more than or equal to 97wt percent.
The C content of the coke is more than or equal to 95 wt%.
Al of the rho-alumina2O3The content is more than or equal to 99 wt%; the particle size of the rho-alumina is 60-80 mu m.
The vacuum pressure of the vacuum mud extrusion is 0.05-0.1 Pa.
Example 1
A corundum-calcium hexaluminate with aluminum-chromium slag as main material and its preparation method are provided. The preparation method of the embodiment comprises the following steps:
firstly, mixing materials according to the mass ratio of the aluminum chromium slag to the limestone of 100: 15-17, and carrying out mixed grinding in a ball mill until the granularity is less than or equal to 0.1mm to obtain a mixed material.
Secondly, adding the mixture into an electric arc furnace, preserving heat for 20-30 minutes at 1550-1630 ℃, adding coke which accounts for 10-12 wt% of the mixture into the electric arc furnace, and continuing to preserve heat for 35-45 minutes; and then removing the scum layer, cooling to room temperature along with the furnace, discharging, and crushing to obtain the granular material.
And thirdly, adding water accounting for 20-22 wt% of the particle materials into the particle materials, and carrying out wet grinding in a ball mill until the particle size is less than or equal to 80 mu m to obtain the wet grinding material.
And fourthly, adding rho-alumina accounting for 5-7 wt% of the wet grinding material into the wet grinding material, and mixing for 3-5 minutes to obtain a premix.
Fifthly, adding the premix into a pug mill, extruding and forming in vacuum, and ageing for 12-24 hours; and then placing the mixture in a resistance furnace, heating to 1000-1040 ℃, preserving heat for 2-4 hours, and cooling along with the furnace to obtain the corundum-calcium hexaluminate taking the aluminum-chromium slag as the main material.
The corundum-calcium hexaluminate prepared by the embodiment and using the aluminum-chromium slag as the main material is determined by the following steps: the bulk density is 2.9-3.1 g/cm3(ii) a The apparent porosity is 2-4%; the refractoriness is 1700 to 1720 ℃.
Example 2
A corundum-calcium hexaluminate with aluminum-chromium slag as main material and its preparation method are provided. The preparation method of the embodiment comprises the following steps:
firstly, mixing materials according to the mass ratio of the aluminum chromium slag to the limestone of 100: 16-18, and carrying out mixed grinding in a ball mill until the granularity is less than or equal to 0.1mm to obtain a mixed material.
Secondly, adding the mixture into an electric arc furnace, preserving heat for 20-30 minutes at the temperature of 1590-1670 ℃, adding coke which accounts for 11-13 wt% of the mixture into the electric arc furnace, and continuing preserving heat for 40-50 minutes; and then removing the scum layer, cooling to room temperature along with the furnace, discharging, and crushing to obtain the granular material.
And thirdly, adding water which accounts for 21-23 wt% of the granular material into the granular material, and carrying out wet grinding in a ball mill until the granularity is less than or equal to 80 mu m to obtain the wet grinding material.
And fourthly, adding rho-alumina accounting for 5-7 wt% of the wet grinding material into the wet grinding material, and mixing for 3-5 minutes to obtain a premix.
Fifthly, adding the premix into a pug mill, extruding and forming in vacuum, and ageing for 12-24 hours; and then placing the mixture in a resistance furnace, heating to 1020-1060 ℃, preserving heat for 2-4 hours, and cooling along with the furnace to obtain the corundum-calcium hexaluminate taking the aluminum-chromium slag as the main material.
The corundum-calcium hexaluminate prepared by the embodiment and using the aluminum-chromium slag as the main material is determined by the following steps: the bulk density is 3.0 to 3.2g/cm3(ii) a The apparent porosity is 3-5%; the refractoriness is 1710-1730 ℃.
Example 3
A corundum-calcium hexaluminate with aluminum-chromium slag as main material and its preparation method are provided. The preparation method of the embodiment comprises the following steps:
firstly, mixing materials according to the mass ratio of the aluminum chromium slag to the limestone of 100: 17-19, and carrying out mixed grinding in a ball mill until the granularity is less than or equal to 0.1mm to obtain a mixed material.
Secondly, adding the mixture into an electric arc furnace, preserving heat for 20-30 minutes at 1630-1710 ℃, adding coke accounting for 12-14 wt% of the mixture into the electric arc furnace, and continuing preserving heat for 45-55 minutes; and then removing the scum layer, cooling to room temperature along with the furnace, discharging, and crushing to obtain the granular material.
And thirdly, adding water accounting for 22-24 wt% of the granules into the granules, and carrying out wet grinding in a ball mill until the granularity is less than or equal to 80 mu m to obtain the wet grinding material.
And fourthly, adding rho-alumina accounting for 6-8 wt% of the wet grinding material into the wet grinding material, and mixing for 3-5 minutes to obtain a premix.
Fifthly, adding the premix into a pug mill, extruding and forming in vacuum, and ageing for 12-24 hours; and then placing the mixture in a resistance furnace, heating to 1040-1080 ℃, preserving heat for 3-5 hours, and cooling along with the furnace to obtain the corundum-calcium hexaluminate taking the aluminum-chromium slag as the main material.
The corundum-calcium hexaluminate prepared by the embodiment and using the aluminum-chromium slag as the main material is determined by the following steps: the bulk density is 3.1 to 3.3g/cm3(ii) a The apparent porosity is 4-6%; the refractoriness is 1720-1740 ℃.
Example 4
A corundum-calcium hexaluminate with aluminum-chromium slag as main material and its preparation method are provided. The preparation method of the embodiment comprises the following steps:
firstly, mixing materials according to the mass ratio of the aluminum chromium slag to the limestone of 100: 18-20, and carrying out mixed grinding in a ball mill until the granularity is less than or equal to 0.1mm to obtain a mixed material.
Secondly, adding the mixture into an electric arc furnace, preserving heat for 20-30 minutes at 1670-1750 ℃, adding coke accounting for 13-15 wt% of the mixture into the electric arc furnace, and continuing preserving heat for 50-60 minutes; and then removing the scum layer, cooling to room temperature along with the furnace, discharging, and crushing to obtain the granular material.
And thirdly, adding water accounting for 23-25 wt% of the granular material into the granular material, and carrying out wet grinding in a ball mill until the granularity is less than or equal to 80 microns to obtain the wet grinding material.
And fourthly, adding rho-alumina accounting for 6-8 wt% of the wet grinding material into the wet grinding material, and mixing for 3-5 minutes to obtain a premix.
Fifthly, adding the premix into a pug mill, extruding and forming in vacuum, and ageing for 12-24 hours; and then placing the mixture in a resistance furnace, heating to 1060-1100 ℃, preserving heat for 3-5 hours, and cooling along with the furnace to obtain the corundum-calcium hexaluminate taking the aluminum-chromium slag as the main material.
The corundum-calcium hexaluminate prepared by the embodiment and using the aluminum-chromium slag as the main material is determined by the following steps: the bulk density is 3.2 to 3.4g/cm3(ii) a The apparent porosity is 5-7%; the refractoriness is 1730-1750 ℃.
Compared with the prior art, the specific implementation mode has the following positive effects:
1. the specific embodiment takes the aluminum-chromium slag derived from smelting chromium metal as a main raw material, and the aluminum-chromium slag is crushed and then fused, so that the impurity components of the aluminum-chromium slag are fully utilized for fluxing, the fused temperature is obviously reduced, no special requirement is required on equipment, and the preparation cost of the corundum-calcium hexaluminate taking the aluminum-chromium slag as a main material is obviously reduced.
2. This embodiment is directed to Al reduction by melting2O3And Cr2O3The separation is carried out, the resource utilization rate is improved, and simultaneously, Cr is eliminated6+Pollution and environmental protection.
3. In the specific embodiment, the particles subjected to electric smelting reduction are sintered for the second time, and a wet grinding-mud extrusion process is combined, so that the sintering activity is improved, and the sintering reaction temperature is reduced; can also eliminate CA and CA2And the purity of the corundum-calcium hexaluminate taking the aluminum chromium slag as the main material is improved by using the intermediate products.
The corundum-calcium hexaluminate prepared by the specific embodiment and using the aluminum chromium slag as the main material is determined as follows: the bulk density is 2.9-3.4 g/cm3(ii) a The apparent porosity is 2-7%; the refractoriness is 1700-1750 ℃.
Therefore, the specific implementation mode has the characteristics of low production cost, high resource utilization rate, no special requirement on equipment and environmental friendliness; the prepared corundum-calcium hexaluminate with the aluminum-chromium slag as the main material has high density, good sintering performance and high refractoriness.
Claims (4)
1. A preparation method of corundum-calcium hexaluminate by taking aluminum-chromium slag as a main material is characterized by comprising the following steps:
firstly, mixing materials according to the mass ratio of the aluminum chromium slag to the limestone of 100: 15-20, and carrying out mixed grinding in a ball mill until the granularity is less than or equal to 0.1mm to obtain a mixed material;
secondly, adding the mixture into an electric arc furnace, preserving heat for 20-30 minutes at 1550-1750 ℃, adding coke which accounts for 10-15 wt% of the mixture into the electric arc furnace, and continuing to preserve heat for 35-60 minutes; then removing the scum layer, cooling to room temperature along with the furnace, discharging, and crushing to obtain granules;
thirdly, adding water accounting for 20-25 wt% of the particle materials into the particle materials, and carrying out wet grinding in a ball mill until the particle size is less than or equal to 80 mu m to obtain wet grinding materials;
fourthly, adding rho-alumina accounting for 5-8 wt% of the wet grinding material into the wet grinding material, and mixing for 3-5 minutes to obtain a premix;
fifthly, adding the premix into a pug mill, extruding and forming in vacuum, and ageing for 12-24 hours; then placing the mixture in a resistance furnace, heating to 1000-1100 ℃, preserving heat for 2-5 hours, and cooling along with the furnace to obtain corundum-calcium hexaluminate taking the aluminum-chromium slag as a main material;
the aluminum chromium slag is slag derived from smelting metal chromium by an aluminothermic method, and the aluminum chromium slag mainly comprises the following chemical components: al (Al)2O3The content is 70-80 wt%; cr (chromium) component2O3The content is 5-10 wt%; the MgO content is 5-10 wt%; al of the rho-alumina2O3The content is more than or equal to 99 wt%; the particle size of the rho-alumina is 60-80 mu m;
the vacuum pressure of the vacuum mud extrusion is 0.05-0.1 Pa.
2. The method for preparing corundum-calcium hexaluminate with aluminum-chromium slag as main material according to claim 1, wherein the CaCO of limestone3The content is more than or equal to 97wt percent.
3. The method for preparing corundum-calcium hexaluminate by using aluminum-chromium slag as a main material according to claim 1, wherein the C content of the coke is more than or equal to 95 wt%.
4. The corundum-calcium hexaluminate with the aluminum-chromium slag as the main material is characterized in that the corundum-calcium hexaluminate with the aluminum-chromium slag as the main material is prepared by the method for preparing the corundum-calcium hexaluminate with the aluminum-chromium slag as the main material according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810322793.7A CN108484185B (en) | 2018-04-11 | 2018-04-11 | Corundum-calcium hexaluminate with aluminum-chromium slag as main material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810322793.7A CN108484185B (en) | 2018-04-11 | 2018-04-11 | Corundum-calcium hexaluminate with aluminum-chromium slag as main material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN108484185A CN108484185A (en) | 2018-09-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928135A (en) * | 2010-09-01 | 2010-12-29 | 中国地质大学（北京） | Calcium hexaluminate lightweight refractory brick and preparation method thereof |
| CN101928153A (en) * | 2010-09-01 | 2010-12-29 | 中国地质大学（北京） | Calcium hexaluminate and corundum composite porous light heat insulation refractory material and preparation method thereof |
| CN102531555A (en) * | 2012-03-15 | 2012-07-04 | 福州大学 | Calcium hexaaluminate/corundum composite synthesized in situ with aluminium factory sludge and oyster shells |
| CN102718514A (en) * | 2012-06-28 | 2012-10-10 | 江苏晶鑫高温材料有限公司 | Micropore high-strength corundum-calcium hexaluminate composite refractory raw material and preparation method thereof |
| CN105585314A (en) * | 2015-12-22 | 2016-05-18 | 辽宁科技学院 | Dense calcium hexaluminate grog refractory and preparation method thereof |
-
2018
- 2018-04-11 CN CN201810322793.7A patent/CN108484185B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928135A (en) * | 2010-09-01 | 2010-12-29 | 中国地质大学（北京） | Calcium hexaluminate lightweight refractory brick and preparation method thereof |
| CN101928153A (en) * | 2010-09-01 | 2010-12-29 | 中国地质大学（北京） | Calcium hexaluminate and corundum composite porous light heat insulation refractory material and preparation method thereof |
| CN102531555A (en) * | 2012-03-15 | 2012-07-04 | 福州大学 | Calcium hexaaluminate/corundum composite synthesized in situ with aluminium factory sludge and oyster shells |
| CN102718514A (en) * | 2012-06-28 | 2012-10-10 | 江苏晶鑫高温材料有限公司 | Micropore high-strength corundum-calcium hexaluminate composite refractory raw material and preparation method thereof |
| CN105585314A (en) * | 2015-12-22 | 2016-05-18 | 辽宁科技学院 | Dense calcium hexaluminate grog refractory and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| "CaAl2O19及其复相材料的制备与性能研究"，易帅，《工程科技Ⅰ辑》，第B015-8页;易帅;《工程科技Ⅰ辑》;20151031;第B015-8页 * |
| "Separation and characterisation of fused alumina obtained from aluminium chromium slag"，Pengda Zhao et al.，《Ceramics International》，第44卷，第4期，第3590-3595页;Pengda Zhao et al.;《Ceramics International》;20171113;第44卷(第4期);第3590-3595页 * |
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