CN112341177A - Corrosion-resistant compact lattice brick for upper part of coke oven regenerator and preparation method thereof - Google Patents
Corrosion-resistant compact lattice brick for upper part of coke oven regenerator and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an anti-corrosion compact checker brick for the upper part of a coke oven regenerator and a preparation method thereof, wherein the anti-corrosion compact checker brick comprises the following raw materials in parts by weight: 25-60 parts of low-aluminum mullite particles, 15-25 parts of andalusite, 4-6 parts of high-temperature alumina micro powder, 10-15 parts of high-purity kaolin fine powder, 10-15 parts of clay and 5-6 parts of a bonding agent. The invention has the characteristics of low porosity, high strength, stable high-temperature structure, high refractoriness under load, excellent high-temperature compressive creep property, good CO corrosion resistance effect and the like, solves the problems of grid hole blockage, softening and collapse of the coke oven checker bricks in the use process, has better performance than common clayey and semi-siliceous checker bricks, and can meet the requirement of high temperature at the top of a regenerator of a large coke oven.
Description
Technical Field
The invention relates to an anti-corrosion compact checker brick for the upper part of a coke oven regenerator and a preparation method thereof, which are applied to the field of coking.
Background
A7.63 m coke oven of a certain domestic steel mill is an ultra-large coke oven introduced by Germany, a regenerative chamber is designed in a cellular mode, air and coal gas are regulated through a jet plate at the lower part of the regenerative chamber, lattice bricks of the regenerative chamber are all made of clay and semi-siliceous materials and are built in a staggered mode in a plurality of layers. However, when in use, part of clayey and semi-siliceous checker bricks are seriously foamed or deformed after use, and particularly 6 layers of checker bricks at the top of a coke oven are softened, blocked and bonded together, so that the resistance of a regenerator is increased, the gas delivery is insufficient, the temperature of a flame path is reduced, and the maturity of coke is poor. The analysis reason is that the dust content of the blast furnace gas is high, and the dust is attached to the surface of the checker brick to block the grid holes, so that the heat exchange function of the checker brick is lost; the checker bricks are easy to generate reduction reaction in the enriched iron-containing dust and CO environment, and the foaming, hollowing, bulging and pore channel blocking of the clay bricks are caused by the infiltration and erosion action of ash residues; the cracking of the furnace wall at the top of the regenerator causes the fire of the gas flowing backwards, the temperature reaches 1350 ℃ or even about 1400 ℃, and the temperature is far beyond the requirement of 1300 ℃ for the safe use temperature of the clay checker bricks and the semi-silica bricks, so that the checker bricks are softened, deformed and collapsed, and the quality and the production efficiency of coke are seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects of high impurity content, high porosity, poor corrosion resistance, poor high temperature resistance, short service life and the like of common clay bricks and semi-silica bricks of the coke oven. The invention provides a corrosion-resistant compact checker brick and a preparation method thereof, the product has the characteristics of low air holes, high strength, stable high-temperature structure, high softening temperature under load, excellent high-temperature compressive creep property, good CO corrosion resistance effect and the like, solves the problems of blockage, softening collapse and the like of the check holes, improves the coke quality, prolongs the service life, reduces the operation cost of enterprises, meets the requirement of high temperature at the top of a regenerator of a large-scale coke oven, and is a new generation of material for the regenerator of the coke oven.
The anti-corrosion compact checker brick for the upper part of the coke oven regenerator comprises the following raw materials in parts by weight:
25-60 parts of low-aluminum mullite particles, 15-25 parts of andalusite, 4-6 parts of high-temperature alumina micro powder, 10-15 parts of high-purity kaolin fine powder, 10-15 parts of clay and 5-6 parts of a bonding agent.
The anti-corrosion compact checker brick has the particle size of low-aluminum mullite particles of 0.1-3mm, the particle size of high-temperature alumina micro powder of 0.003mm, the particle size of high-purity kaolin fine powder of 0.074mm and the particle size of clay of 0.045 mm.
The andalusite comprises andalusite particles with the particle size of 0.1-1mm and andalusite fine powder with the particle size of 0.045 mm.
The binding agent is dextrin solution.
The preparation method of the anti-corrosion compact checker brick comprises the following steps of (1) uniformly mixing fine andalusite powder, alumina micro powder, fine kaolin powder and clay to prepare mixed powder; uniformly mixing the low-aluminum mullite particles and the andalusite particles, then adding a bonding agent, and mixing for 2-3 minutes; finally, adding the mixed powder, mixing for 5-7 minutes, and effectively mulling for 10 minutes to obtain uniformly mixed pug;
(2) mixing by using an inclined high-speed mixer, pressing uniformly mixed pug by using a press machine of more than 300t after light weight, placing a sample in a drying vehicle, drying in a tunnel dryer, controlling the inlet temperature to be 50-70 ℃, the outlet temperature to be 80-110 ℃, the drying time to be not less than 48 hours, controlling the drying moisture to be less than 1.5 percent, and firing in a tunnel kiln at the temperature of 1450-1480 ℃.
The invention is characterized in that:
(1) the high-quality low-aluminum mullite is used as a main raw material, and has the advantages of low air holes, high density, high-temperature structural strength, small thermal expansion rate and thermal shock stabilityGood performance, high sintering strength and the like. Due to Fe in mullite material2O3、K2The content of O is low, the surface deterioration rate of the coke oven checker bricks in the using process is slow, the reaction is slow, and therefore, the high-purity compact aggregate is resistant to CO and Fe2O3The infiltration reaction has good effect, and simultaneously can ensure that the aggregate part can support the structural integrity of the brick after the checker brick is eroded by the infiltration of the slag. Adding checker bricks at the same time>The content of 1mm of aggregate is more beneficial to the compact accumulation of particles, and the densification of the blank body is realized.
(2) The matrix material determines the sintering state of the product, and high impurity can seriously affect the high-temperature performance of the product. The matrix is introduced with 'three stones', high-temperature alumina micro powder, high-purity kaolin and the like with low impurity content to strengthen the properties of the matrix, improve the chemical corrosion resistance and the CO resistance, and prevent the softening and collapse of the checker bricks after the slag penetration. The alumina micropowder adopts 3um, has the characteristics of large specific surface area, high surface activity, good chemical stability, high purity, high melting point and the like, improves the reaction activity in firing, ensures the sintering quality, is favorable for pore micronization, and realizes the densification of products.
(3) Slag is easy to permeate from surface open pores, the key is to reduce the porosity, and the permeability is improved. The coke oven checker brick has thin multi-wall, large surface area and large molding densification difficulty, so the design and optimization of the mold are carried out, which is beneficial to densification. The preparation and application of mixed powder are carried out by adopting scientific and reasonable component proportion and reasonable grain size composition, and an inclined high-speed mixer is selected to fully diffuse the bonding agent, improve the fluidity of the pug and ensure the filling effect in use. The high-pressure forming process is selected, and measures such as repeated die hanging, pressurization and the like are adopted, so that the porosity is reduced.
(4) By a reasonable thermal regulation, the sintering strength of the product and the sufficient mullite reaction are ensured to form a mullite network structure, and the thermal shock stability, the high-temperature soft-loading performance, the creep resistance and the like are improved.
The anti-corrosion compact checker brick is applied to a coke oven regenerator and is more preferably applied to a high-temperature part at the upper part of the coke oven regenerator.
Compared with the prior art, the invention has the following beneficial effects:
(1) the product has the characteristics of low porosity, high strength, stable high-temperature structure, high refractoriness under load, excellent high-temperature compressive creep property, good CO corrosion resistance effect and the like.
(2) The composite material is suitable for coke oven regenerators, solves the problems of blocking, softening and collapsing of grid holes, can meet the requirement of high temperature at the top of a large coke oven regenerator, and is a new generation of material for the coke oven regenerator.
(3) The product is densified, the heat storage speed and the heat release speed are improved, the heat exchange efficiency is improved, the coking time can be shortened, the coke yield is increased, and the production cost is reduced. The volume density of the product is 2.35g/cm3, which is 14.6% higher than that of the common clay brick 2.05g/cm3, the coke pushing time is shortened from 31 h/time to 27 h/time, and the yield is increased by 11.5%.
(4) The coke quality is improved, the escape of coke powder can be reduced, the smoke emission and the environmental pollution are reduced, and the environmental protection benefit is huge.
(5) The product does not contain elements which are unfavorable to the environment, belongs to green and environment-friendly products, and accords with the national industrial policy.
(6) The method lays a foundation for solving the similar problems of the domestic large-scale coke oven, has wide popularization value and must produce good social benefits.
Detailed Description
The invention will be further illustrated by the following examples
Example 1
The anti-corrosion compact checker brick for the upper part of the coke oven regenerator comprises the following raw materials in parts by weight:
25 parts of low-alumina mullite particles with the granularity of 0.1mm, 15 parts of andalusite, 4 parts of high-temperature alumina micro powder with the granularity of 0.003mm, 10 parts of high-purity kaolin fine powder with the granularity of 0.074mm, 10 parts of clay with the granularity of 0.045mm and 5 parts of dextrin solution.
The preparation method of the erosion-resistant compact checker brick comprises (1) uniformly mixing fine andalusite powder, alumina micropowder, kaolin fine powder and clay to prepare mixed powder; uniformly mixing low-aluminum mullite particles and andalusite particles, then adding a bonding agent, and mixing for 2 minutes; finally, adding the mixed powder, mixing for 5 minutes, and effectively mulling for 10 minutes to obtain uniformly mixed pug;
(2) mixing by using an inclined high-speed mixer, pressing uniformly mixed pug by using a press machine of more than 300t after light weight, placing a sample in a drying vehicle, drying in a tunnel dryer, controlling the inlet temperature to be 50 ℃, the outlet temperature to be 80 ℃, the drying time to be not less than 48 hours, controlling the drying moisture to be less than 1.5 percent, and firing in a tunnel kiln at the temperature of 1450 ℃.
Example 2
The anti-corrosion compact checker brick for the upper part of the coke oven regenerator comprises the following raw materials in parts by weight:
60 parts of low-alumina mullite particles with the granularity of 3mm, 25 parts of andalusite, 6 parts of high-temperature alumina micro powder with the granularity of 0.003mm, 15 parts of high-purity kaolin fine powder with the granularity of 0.074mm, 15 parts of clay with the granularity of 0.045mm and 6 parts of dextrin solution.
The preparation method of the anti-corrosion compact checker brick comprises the following steps of (1) uniformly mixing fine andalusite powder, alumina micro powder, fine kaolin powder and clay to prepare mixed powder; uniformly mixing the low-aluminum mullite particles and the andalusite particles, then adding a bonding agent, and mixing for 3 minutes; finally, adding the mixed powder, mixing for 7 minutes, and effectively mulling for 10 minutes to obtain uniformly mixed pug;
(2) mixing by using an inclined high-speed mixer, pressing uniformly mixed pug by using a press machine of more than 300t after light weight, placing a sample in a drying vehicle, drying in a tunnel dryer, controlling the inlet temperature to be 70 ℃, the outlet temperature to be 110 ℃, the drying time to be not less than 48 hours, controlling the drying moisture to be less than 1.5 percent, and firing in a tunnel kiln at the temperature of 1480 ℃.
Example 3
The anti-corrosion compact checker brick for the upper part of the coke oven regenerator comprises the following raw materials in parts by weight:
40 parts of low-alumina mullite particles with the granularity of 1mm, 20 parts of andalusite, 5 parts of high-temperature alumina micro powder with the granularity of 0.003mm, 12 parts of high-purity kaolin fine powder with the granularity of 0.074mm, 13 parts of clay with the granularity of 0.045mm and 5.5 parts of dextrin solution.
The preparation method of the anti-corrosion compact checker brick comprises the following steps of (1) uniformly mixing fine andalusite powder, alumina micro powder, fine kaolin powder and clay to prepare mixed powder; uniformly mixing the low-aluminum mullite particles and the andalusite particles, then adding a bonding agent, and mixing for 2.5 minutes; finally, adding the mixed powder, mixing for 6 minutes, and effectively mulling for 10 minutes to obtain uniformly mixed pug;
(2) mixing by using an inclined high-speed mixer, pressing uniformly mixed pug by using a press machine of more than 300t after light weight, placing a sample in a drying vehicle, drying in a tunnel dryer, controlling the inlet temperature to be 60 ℃, the outlet temperature to be 90 ℃, the drying time to be not less than 48 hours, controlling the drying moisture to be less than 1.5 percent, and firing in a tunnel kiln at the temperature of 1460 ℃.
The invention is further illustrated by reference to the index properties
TABLE 1 EXAMPLES 1-3 INDICATIONS OF RESISTANT DENSE-TYPE checker BRICKS
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The anti-corrosion compact checker brick for the upper part of the coke oven regenerator is characterized by comprising the following raw materials in parts by weight:
25-60 parts of low-aluminum mullite particles, 15-25 parts of andalusite, 4-6 parts of high-temperature alumina micro powder, 10-15 parts of high-purity kaolin fine powder, 10-15 parts of clay and 5-6 parts of a bonding agent.
2. The erosion resistant dense checker brick as claimed in claim 1, wherein the low alumina mullite grains have a grain size of 0.1 to 3mm, the high temperature alumina micropowder has a grain size of 0.003mm, the high purity kaolin fine powder has a grain size of 0.074mm, and the clay has a grain size of 0.045 mm.
3. The erosion resistant densified checker brick of claim 1, wherein the andalusite includes andalusite particles having a particle size of 0.1 to 1mm and andalusite fines having a particle size of 0.045 mm.
4. The erosion resistant densified checker brick of claim 1, wherein the binder is a dextrin solution.
5. The process for producing a corrosion-resistant densified checker brick according to claim 1, wherein (1) fine andalusite powder, fine alumina powder, fine kaolin powder and clay are uniformly mixed to prepare a mixed powder; uniformly mixing the low-aluminum mullite particles and the andalusite particles, then adding a bonding agent, and mixing for 2-3 minutes; finally, adding the mixed powder, mixing for 5-7 minutes, and effectively mulling for 10 minutes to obtain uniformly mixed pug;
(2) mixing by using an inclined high-speed mixer, pressing uniformly mixed pug by using a press machine of more than 300t after light weight, placing a sample in a drying vehicle, drying in a tunnel dryer, controlling the inlet temperature to be 50-70 ℃, the outlet temperature to be 80-110 ℃, the drying time to be not less than 48 hours, controlling the drying moisture to be less than 1.5%, and sintering in a tunnel kiln.
6. The process for producing a corrosion-resistant densified checker brick according to claim 5, wherein the firing temperature is 1450 ℃ to 1480 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011038534.5A CN112341177A (en) | 2020-09-28 | 2020-09-28 | Corrosion-resistant compact lattice brick for upper part of coke oven regenerator and preparation method thereof |
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| CN115286405A (en) * | 2022-08-25 | 2022-11-04 | 宜兴瑞泰耐火材料有限公司 | Low-aluminum mullite brick with high molybdenum waste liquid corrosion resistance and preparation method thereof |
| CN115321970A (en) * | 2022-08-30 | 2022-11-11 | 河南瑞泰耐火材料科技有限公司 | Andalusite-hercynite composite brick for zinc volatilization rotary kiln and preparation method thereof |
| CN116283248A (en) * | 2023-02-03 | 2023-06-23 | 江苏华窑光宇科技有限公司 | Compact composite brick for remelting aluminum furnace and manufacturing method thereof |
| CN117923921A (en) * | 2024-01-18 | 2024-04-26 | 山东耐火材料集团有限公司 | High-heat-storage low-creep clay brick for high-wind-temperature hot blast stove and preparation method thereof |
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| CN116283248A (en) * | 2023-02-03 | 2023-06-23 | 江苏华窑光宇科技有限公司 | Compact composite brick for remelting aluminum furnace and manufacturing method thereof |
| CN117923921A (en) * | 2024-01-18 | 2024-04-26 | 山东耐火材料集团有限公司 | High-heat-storage low-creep clay brick for high-wind-temperature hot blast stove and preparation method thereof |
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