Production method of high-temperature anti-stripping chromium corundum brick
阅读说明：本技术 一种高温抗剥落铬刚玉砖的生产方法 (Production method of high-temperature anti-stripping chromium corundum brick ) 是由 宋二鹏 宋进朝 孟祥峰 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种高温抗剥落铬刚玉砖的配方,包括以下原料：电熔白刚玉、电熔氧化铬、工业氧化铬绿、氧化铝球、活性α-Al-2O-3微粉、ρ-Al-2O-3微粉、磷酸二氢铝。选择电熔白刚玉、电熔白刚玉粉、电熔氧化铬、工业氧化铬绿、氧化铝球、活性α-Al-2O-3微粉、ρ-Al-2O-3微粉、磷酸二氢铝,且原料中组分粒径的选择,便于制备的铬刚玉砖耐高温且抗剥落铬。(The invention discloses a formula of a high-temperature anti-stripping chromium corundum brick, which comprises the following raw materials: fused white corundum, fused chromium oxide, industrial chromium oxide green, alumina ball, active alpha-Al 2 O 3 Fine powder of rho-Al 2 O 3 Micropowder and aluminum dihydrogen phosphate. Selecting electric melting white corundum, electric melting white corundum powder, electric melting chromium oxide, industrial chromium oxide green, alumina ball and active alpha-Al 2 O 3 Fine powder of rho-Al 2 O 3 The chromium corundum brick is prepared by using micro powder and aluminum dihydrogen phosphate, and the particle size of the components in the raw materials is selected, so that the prepared chromium corundum brick is high-temperature resistant and anti-stripping chromium.)
1. The formula of the high-temperature anti-stripping chromium corundum brick is characterized in that: the method comprises the following raw materials: fused white corundum, fused chromium oxide, industrial chromium oxide green, alumina ball, active alpha-Al2O3Fine powder of rho-Al2O3Micropowder and aluminum dihydrogen phosphate.
2. The formulation of a high temperature spalling resistant chromium corundum brick as claimed in claim 1, wherein: the grain size of the electro-fused white corundum is 3-5mm, 1-3mm and 1mm, and the electro-fused white corundum is one of 320 meshes.
3. The formulation of a high temperature spalling resistant chromium corundum brick as claimed in claim 1, wherein: the raw materials comprise the following components in parts by mass: 3-6 parts of 3-5mm fused white corundum, 35-40 parts of 1-3mm fused white corundum, 8-12 parts of fused white corundum smaller than 1mm, 12-18 parts of 320-mesh fused white corundum, 5-18 parts of fused chromium oxide, 0-8 parts of industrial chromium oxide green, 2-6 parts of alumina balls, active alpha-Al2O34-8 parts of micro powder, rho-Al2O32-4 parts of micro powder and 2.5-4.5 parts of aluminum dihydrogen phosphate.
4. The formulation of a high temperature spalling resistant chromium corundum brick as claimed in claim 1, wherein: the particle size of the alumina ball is 1.5-2.0 mm.
5. The formulation of a high temperature spalling resistant chromium corundum brick as claimed in claim 1, wherein: the aluminum dihydrogen phosphate is solution or sol, and the specific gravity is 1.35-1.45g/cm3。
6. A method of producing a high temperature spalling resistant chromium corundum brick formulation as claimed in any one of claims 1 to 5, wherein: the preparation method comprises the following steps:
(1) fine powder premixing: accurately weighing 320-mesh fused white corundum and active alpha-Al according to formula amount2O3Mixing the micro powder, industrial chromium oxide green and rho-Al 2O3 micro powder in a pre-mixer for 30min, and discharging for later use;
(2) mixing the aggregate: accurately weighing 3-5mm fused white corundum, 1-3mm fused white corundum, 0-1mm fused white corundum, fused chromium oxide and alumina balls according to the formula amount, adding the mixture into a wet mill, dry-mixing for 2-3min, adding 2/3 amount of aluminum dihydrogen phosphate, mixing for 5-10min, adding the fine powder obtained after premixing in the step (1), mixing for 3-5min, adding the rest 1/3 amount of aluminum dihydrogen phosphate solution, mixing for 15-25min, and discharging;
(3) Molding: molding the pug obtained in the step (2) by adopting a friction press;
(4) drying: drying the green brick formed in the step (3) for 24-36h at the temperature of 120 ℃;
(5) and (3) firing: and (4) firing the dried green brick in the step (4) at the temperature of 1550-1650 ℃.
7. The method for producing a high-temperature anti-spalling chromium corundum brick as claimed in claim 6, wherein the method comprises the following steps: in the step (3), the pressure parameter of the press is 315t, 630t or 1000 t.
8. The method for producing a high-temperature anti-spalling chromium corundum brick as claimed in claim 6, wherein the method comprises the following steps: in the step (5), the sintering heat preservation time is 8-12 h.
Technical Field
The invention relates to the technical field of chromium corundum bricks, in particular to a production method of a high-temperature anti-stripping chromium corundum brick.
Background
The carbon black is generated by pyrolysis of natural gas or heavy oil in a carbon black reaction furnace. The combustion section and the throat pipe are the highest temperature parts of the reaction furnace, and the temperature can reach 1950 ℃. The inner lining of the carbon black reaction furnace is mainly subjected to a reaction product H in the reaction process2C, CO and ash, high-temperature melting, high-temperature high-speed airflow impact and thermal shock effect of cooling water or stopping opening the furnace. Therefore, the following properties are required for the lining refractory: (1) the fireproof performance is high, and the fireproof performance is not softened and deformed at a higher temperature; (2) the high-temperature volume stability and the stability under a reducing atmosphere are excellent; (3) stronger molten ash erosion resistance; (4) high temperature strength to resist scouring by high velocity gas flow; (5) good thermal shock resistance.
In the actual production, special conditions such as product variety replacement, furnace shutdown and blockage of a raw oil nozzle often occur. When the product variety is replaced and the furnace is shut down, about 0.3MPa of hot steam is sprayed into the reaction furnace from the raw oil inlet, and about 120T of hot steam is directly sprayed to the furnace lining at 1600-1760 ℃ to generate strong thermal shock on the furnace lining material, so that the surface of the hot-surface lining generates cracks, even flakiness or explosion cracks. Therefore, the spalling resistance of the lining refractory of the carbon black furnace is also a key factor for measuring the service life of the carbon black furnace.
The refractory material used for the lining of the throat pipe section of the carbon black reaction furnace is a chromium corundum brick (the content is 8-25 percent), and in order to improve the refractoriness of the chromium corundum brick to more than 2000 ℃, the Cr in the chromium corundum brick is required to be improved2O3Content of, however, Cr2O3The content is increased, the rapid cooling and heating resistance of the chromium corundum brick can be reduced, and the chromium corundum brick is peeled off and chipped due to temperature fluctuation under a high-temperature condition, so that the service life of the furnace is influenced. At present, most measures are taken that 5 to 10 percent of electric melting pure ZrO is added into the chromium corundum brick2However, this greatly increases the cost of the chrome corundum brick
Disclosure of Invention
The invention aims to provide a production method of a high-temperature anti-stripping chromium corundum brick, which solves the problem that the chromium corundum brick strips and falls off due to temperature fluctuation under a high-temperature condition.
In order to solve the technical problems, the invention adopts the following technical scheme:
the formula of the high-temperature anti-stripping chromium corundum brick comprises the following raw materials: fused white corundum, fused chromium oxide, industrial chromium oxide green, alumina ball, active alpha-Al2O3Fine powder of rho-Al2O3Micropowder and aluminum dihydrogen phosphate.
Further, the method comprises the following steps of; the grain size of the electro-fused white corundum is 3-5mm, 1-3mm and less than 1mm, and the electro-fused white corundum is one of 320 meshes; wherein:
3-5mm is more than 3mm and less than or equal to 5 mm;
1-3mm is more than or equal to 1mm and less than or equal to 3 mm;
the 320 meshes are executed according to the international mesh standard.
Further, the method comprises the following steps of; the raw materials comprise the following components in parts by mass: 3-6 parts of 3-5mm fused white corundum, 35-40 parts of 1-3mm fused white corundum, 8-12 parts of fused white corundum less than 1mm, 12-18 parts of fused white corundum, 5-18 parts of fused chromium oxide, less than 8 parts of industrial chromium oxide green, 2-6 parts of alumina balls, active alpha-Al2O34-8 parts of micro powder, rho-Al2O32-4 parts of micro powder and 2.5-4.5 parts of aluminum dihydrogen phosphate.
Further, the method comprises the following steps of; the particle size of the alumina ball is 1.5-2.0mm, and the particle size of 1.5-2.0mm is more than 1.5mm and less than or equal to 2.0 mm.
Further, the method comprises the following steps of; the aluminum dihydrogen phosphate is solution or sol, and the specific gravity is 1.35-1.45g/cm 3。
Further, the method comprises the following steps of; the preparation method comprises the following steps:
(1) fine powder premixing: accurately weighing 320-mesh fused white corundum and active alpha-Al according to formula amount2O3Mixing the micro powder, industrial chromium oxide green and rho-Al 2O3 micro powder in a pre-mixer for 30min, and discharging for later use;
(2) mixing the aggregate: accurately weighing 3-5mm fused white corundum, 1-3mm fused white corundum, less than 1mm fused white corundum, fused chromium oxide and alumina balls according to the formula amount, adding the mixture into a wet mill, dry-mixing for 2-3min, adding 2/3 amount of aluminum dihydrogen phosphate, mixing for 5-10min, adding the fine powder obtained after premixing in the step (1), mixing for 3-5min, adding the rest 1/3 amount of aluminum dihydrogen phosphate solution, mixing for 15-25min, and discharging;
(3) molding: molding the pug obtained in the step (2) by adopting a friction press;
(4) drying: drying the green brick formed in the step (3) for 24-36h at the temperature of 120 ℃;
(5) and (3) firing: and (4) firing the dried green brick in the step (4) at the temperature of 1550-1650 ℃.
Further, the method comprises the following steps of; in the step (3), the pressure parameter of the press is 315t, 630t or 1000 t.
Further, the method comprises the following steps of; in the step (5), the sintering heat preservation time is 8-12 h.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. Selecting electric melting white corundum, electric melting chromium oxide, industrial chromium oxide green, alumina ball and active alpha-Al2O3Fine powder of rho-Al2O3The chromium corundum brick is prepared by using micro powder and aluminum dihydrogen phosphate, and the particle size of the components in the raw materials is selected, so that the prepared chromium corundum brick is high-temperature resistant and anti-stripping chromium.
2. The invention adopts aluminum dihydrogen phosphate solution or alumina sol as a binder to manufacture the high-purity chromium corundum brick for the reaction section and the throat pipe of the carbon black furnace, introduces the alumina stress dispersion ball, can absorb and disperse the thermal expansion stress of corundum at high temperature, and improves the rapid cooling and rapid heating resistance of the high-purity chromium corundum brick. The high-temperature anti-stripping chromium corundum brick has the characteristics of low firing temperature, high strength, good rapid cooling and rapid heating resistance and the like, the thermal shock stability (water cooling at 1100 ℃) can reach more than 15 times, and the thermal shock stability of the chromium corundum brick introduced with zirconia is only about 8 times. The high-temperature anti-stripping chromium corundum brick produced by the invention can meet the use requirement of the high-temperature section of the related carbon black furnace.
3. The addition of chromium increases the critical strength of the prepared product when in use, enhances the stability, saves energy and protects the environment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
the formula of the high-temperature anti-stripping chromium corundum brick comprises the following raw materials: fused white corundum, fused chromium oxide, industrial chromium oxide green, alumina ball, active alpha-Al2O3Fine powder of rho-Al2O3Micro powder and aluminum dihydrogen phosphate; the chromium corundum brick selects various components as raw materials to improve Cr in the chromium corundum brick2O3The content and the improved refractoriness of the chromium corundum brick reach more than 2000 ℃, and the prepared product is not easy to cause the peeling and the block falling of the chromium corundum brick under the temperature fluctuation at high temperature.
Example 2:
on the basis of the embodiment 1, the grain size of the electro-fused white corundum is selected from three types of 3-5mm, 1-3mm and less than 1mm, and the electro-fused white corundum is one of 320 meshes; the fused white corundum has the advantages that the grain sizes of the fused white corundum, the fused white corundum and the fused white corundum are selected, and the prepared product has good quality.
Example 3:
on the basis of the embodiment 1-2, the raw materials comprise the following components in parts by mass: 3 parts of 3-5mm fused white corundum, 35 parts of 1-3mm fused white corundum, 8 parts of less than 1mm fused white corundum, 12 parts of fused white corundum, 5 parts of fused chromium oxide, 0 part of industrial chromium oxide green, 2 parts of alumina balls and active alpha-Al2O34 parts of micro powder, rho-Al2O32 parts of micro powder and 2.5 parts of aluminum dihydrogen phosphate; the chromium corundum brick prepared by the raw materials with different components has high temperature resistance and good quality.
Example 4:
on the basis of the examples 1 to 3, the raw materials in parts by mass are as follows: 6 parts of 3-5mm fused white corundum, 40 parts of 1-3mm fused white corundum, 12 parts of fused white corundum less than 1mm, 18 parts of fused white corundum, 18 parts of fused chromium oxide, 8 parts of industrial chromium oxide green, 6 parts of alumina balls and active alpha-Al2O38 parts of micro powder, rho-Al2O34 parts of micro powder and 4.5 parts of aluminum dihydrogen phosphate; the chromium corundum brick prepared by the raw materials with different components has high temperature resistance and good quality.
Example 5:
on the basis of the examples 1 to 4, the raw materials are calculated by mass parts as follows: 4.5 parts of 3-5mm fused white corundum, 37.5 parts of 1-3mm fused white corundum, 10 parts of fused white corundum less than 1mm, 15 parts of fused white corundum, 11.5 parts of fused chromium oxide, 4 parts of industrial chromium oxide green, 4 parts of alumina balls, and active alpha-Al2O36 parts of micro powder, rho-Al2O33 parts of micro powder and 3.5 parts of aluminum dihydrogen phosphate; the chromium corundum brick prepared by the raw materials with different components has high temperature resistance and good quality.
Example 6:
on the basis of examples 1 to 5, the particle size of the alumina spheres was 1.5 to 2.0 mm; the size of the particle size is selected, which is beneficial to the preparation of the product.
Example 7:
on the basis of the examples 1 to 6, the aluminum dihydrogen acid is a solution or a sol, and the specific gravity is 1.45g/cm 3; aluminum dihydrogen phosphate solution or aluminum sol is used as a binder.
Example 8:
on the basis of examples 1 to 7, the aluminum dihydrogen acid is a solution or a sol with a specific gravity of 1.35g/cm3(ii) a Aluminum dihydrogen phosphate solution or aluminum sol is used as a binder.
Example 9:
on the basis of examples 1 to 8, the aluminum dihydrogen acid was in the form of a solution or a sol having a specific gravity of 1.40g/cm3(ii) a Aluminum dihydrogen phosphate solution or aluminum sol is used as a binder.
Example 10:
on the basis of examples 1 to 9, the preparation method is as follows:
(1) fine powder premixing: accurately weighing 320-mesh fused white corundum and active alpha-Al according to formula amount2O3Mixing the micro powder, industrial chromium oxide green and rho-Al 2O3 micro powder in a pre-mixer for 30min, and discharging for later use;
(2) mixing the aggregate: accurately weighing 3-5mm fused white corundum, 1-3mm fused white corundum, less than 1mm fused white corundum, fused chromium oxide and alumina balls according to the formula amount, adding the mixture into a wet mill, dry-mixing for 2min, adding 2/3 amount of aluminum dihydrogen phosphate, mixing for 5min, adding the fine powder obtained after premixing in the step (1), mixing for 3min, adding the rest 1/3 amount of aluminum dihydrogen phosphate solution, mixing for 15min, and discharging;
(3) molding: molding the pug obtained in the step (2) by adopting a friction press;
(4) drying: drying the green brick formed in the step (3) for 24 hours at the temperature of 120 ℃;
(5) And (3) firing: firing the dried green brick in the step (4) at 1550 ℃; the raw materials are pre-mixed by fine powder and aggregate, shaped by a press machine, and fired after the green brick is dried, so that the fired product is high temperature resistant and peeling resistant.
Example 11:
on the basis of the examples 1 to 10, the preparation method comprises the following steps:
(1) fine powder premixing: accurately weighing 320-mesh fused white corundum and active alpha-Al according to formula amount2O3Mixing the micro powder, industrial chromium oxide green and rho-Al 2O3 micro powder in a pre-mixer for 30min, and discharging for later use;
(2) mixing the aggregate: accurately weighing 3-5mm fused white corundum, 1-3mm fused white corundum, less than 1mm fused white corundum, fused chromium oxide and alumina balls according to the formula amount, adding the mixture into a wet mill, dry-mixing for 3min, adding 2/3 amount of aluminum dihydrogen phosphate, mixing for 10min, adding the fine powder obtained after premixing in the step (1), mixing for 5min, adding the rest 1/3 amount of aluminum dihydrogen phosphate solution, mixing for 25min, and discharging;
(3) molding: molding the pug obtained in the step (2) by adopting a friction press;
(4) drying: drying the green brick formed in the step (3) for 36 hours at the temperature of 120 ℃;
(5) and (3) firing: firing the dried green brick in the step (4) at 1650 ℃; the raw materials are pre-mixed by fine powder and aggregate, shaped by a press machine, and fired after the green brick is dried, so that the fired product is high temperature resistant and peeling resistant.
Example 12:
on the basis of examples 1 to 11, the preparation method is as follows:
(1) fine powder premixing: accurately weighing 320-mesh fused white corundum and active alpha-Al according to formula amount2O3Mixing the micro powder, industrial chromium oxide green and rho-Al 2O3 micro powder in a pre-mixer for 30min, and discharging for later use;
(2) mixing the aggregate: accurately weighing 4mm of fused white corundum, 1-3mm of fused white corundum, less than 1mm of fused white corundum, fused chromium oxide and alumina balls according to the formula amount, adding the materials into a wet mill, dry-mixing for 2.5min, adding 2/3 weight of aluminum dihydrogen phosphate, mixing for 7.5min, adding the fine powder obtained by premixing in the step (1), mixing for 4min, adding the rest 1/3 weight of aluminum dihydrogen phosphate solution, mixing for 20min, and discharging;
(3) molding: molding the pug obtained in the step (2) by adopting a friction press;
(4) drying: drying the green brick formed in the step (3) for 30 hours at the temperature of 120 ℃;
(5) and (3) firing: firing the dried green bricks in the step (4) at 1600 ℃; the raw materials are pre-mixed by fine powder and aggregate, shaped by a press machine, and fired after the green brick is dried, so that the fired product is high temperature resistant and peeling resistant.
Example 13:
On the basis of the examples 1 to 12, in the step (3), the pressure parameter of the press is 315t, 630t or 1000 t; is convenient for the shaping of the press machine.
Example 14:
on the basis of the embodiments 1 to 13, in the step (5), the sintering heat preservation time is 8 hours; is convenient for preparing the high-temperature anti-stripping chromium corundum brick.
Example 15:
on the basis of the examples 1 to 14, in the step (5), the sintering heat preservation time is 12 hours; is convenient for preparing the high-temperature anti-stripping chromium corundum brick.
Example 16:
on the basis of the embodiments 1 to 15, in the step (5), the sintering heat preservation time is 10 hours; is convenient for preparing the high-temperature anti-stripping chromium corundum brick.
The invention adopts aluminum dihydrogen phosphate solution or alumina sol as a binder to manufacture the high-purity chromium corundum brick for the reaction section and the throat pipe of the carbon black furnace, introduces the alumina stress dispersion ball, can absorb and disperse the thermal expansion stress of corundum at high temperature, and improves the rapid cooling and rapid heating resistance of the high-purity chromium corundum brick. The high-temperature anti-stripping chromium corundum brick has the characteristics of low firing temperature, high strength, good rapid cooling and rapid heating resistance and the like, the thermal shock stability (water cooling at 1100 ℃) can reach more than 15 times, and the thermal shock stability of the chromium corundum brick introduced with zirconia is only about 8 times. The high-temperature anti-stripping chromium corundum brick produced by the invention can meet the use requirement of the high-temperature section of the related carbon black furnace.
The prepared chromium corundum brick comprises the following components: al (Al)2O3≥85.0％，Cr2O3Not less than 10.0%, and volume density not less than 3.20g/cm3The compression strength is more than or equal to 100MPa, the thermal shock stability (water cooling at 1100 ℃) is more than or equal to 15 times, the load softness is more than or equal to 1700 ℃, and the refractoriness is more than or equal to 1800 ℃.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：一种危险废物处置回转窑用高致密锆刚玉砖