CN113998986B - High-strength wear-resistant low-porosity clay brick based on waste mullite silicon carbide brick and preparation method thereof - Google Patents
High-strength wear-resistant low-porosity clay brick based on waste mullite silicon carbide brick and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength wear-resistant low-porosity clay brick based on waste mullite silicon carbide bricks and a preparation method thereof. The clay brick comprises the following components in percentage by mass: 15-30 wt% of waste mullite silicon carbide brick powder, 40-60 wt% of flint clay particles, 10-25 wt% of flint clay powder, 0-2 wt% of silicon micropowder, 4-15 wt% of Guangxi white clay powder and 2-6% of lignin solution; the preparation method of the waste mullite silicon carbide brick powder comprises the following steps: sorting, separating and removing impurities from the waste mullite silicon carbide bricks, then carrying out water sealing and cleaning for 3-4 times, then blowing and airing, crushing and grinding the waste mullite silicon carbide bricks into fine powder with the particle size of less than or equal to 0.088mm, and carrying out iron removal treatment in the crushing and crushing process. The preparation method disclosed by the invention is simple in process and low in cost, realizes the resource recycling of the waste mullite silicon carbide brick, and the obtained clay brick is high in strength, low in porosity, high in refractoriness under load, good in wear resistance and has industrial application potential.
Description
Technical Field
The invention belongs to the technical field of clay bricks, and particularly relates to a high-strength wear-resistant low-porosity clay brick based on waste mullite silicon carbide bricks and a preparation method thereof.
Background
In the metallurgical coking industry, a coke oven for coking coal consumes a large amount of refractory materials after the coke oven has a certain service life in production operation. During coke oven repair and demolition, a large amount of spent refractory material is produced, including spent mullite silicon carbide bricks. These waste refractory materials are basically used as industrial building landfills or are degraded to a small extent.
The clay brick has good refractoriness, refractoriness under load, slag resistance, thermal stability and volume stability, so that the clay brick is widely applied to low-temperature parts of blast furnaces and hot blast stoves in the metallurgical industry, and high-temperature parts of heating furnaces, combustion chambers, chimneys and the like. The prior clay brick technology is mainly prepared by taking flint clay and three-grade high-alumina bauxite clinker as main raw materials.
However, with the massive excavation of the flint clay deposit, the grade and the quantity of the flint clay deposit are reduced; meanwhile, the national improvement on environmental resources is increased, raw material resources are gradually reduced, a suitable material is searched for to replace the flint clay in the clay brick, the usage amount of the flint clay is reduced, and the environment-friendly and economic benefits are achieved.
Disclosure of Invention
The invention aims to provide a high-strength wear-resistant low-porosity clay brick based on waste mullite silicon carbide bricks and a preparation method thereof. The waste mullite silicon carbide brick replaces part of flint clay, so that the waste resource is recycled, the cost is obviously reduced, and the brick has the characteristics of high strength, low porosity, high refractoriness under load and good wear resistance, and has industrial application potential.
In order to solve the technical problems, the invention adopts the following technical scheme:
the high-strength wear-resistant low-porosity clay brick based on the waste mullite silicon carbide brick comprises the following components in percentage by mass:
15-30 wt% of waste mullite silicon carbide brick powder, and the particle size of the waste mullite silicon carbide brick powder is less than or equal to 0.088 mm;
40-60 wt% of flint clay particles with the particle size of 0-3.5 mm;
10-25 wt% of flint clay powder and the particle size of less than or equal to 0.088 mm;
0-2 wt% of silicon micropowder with a particle size of 0.002-0.005 mm;
4-15 wt% of Guangxi white mud powder, and the particle size is less than or equal to 0.075 mm;
2-6% of a lignin solution; wherein:
the preparation method of the waste mullite silicon carbide brick powder comprises the following steps: sorting, separating and removing impurities from the waste mullite silicon carbide bricks, then carrying out water sealing and cleaning for 3-4 times, then blowing and airing, crushing and grinding the waste mullite silicon carbide bricks into fine powder with the particle size of less than or equal to 0.088mm, and carrying out iron removal treatment in the crushing and crushing process.
The mullite silicon carbide brick is also prepared by high-temperature sintering, has good quenching and quick heating performance and good strength and wear resistance, contains a silicon carbide component with high alumina content and certain components, has the refractoriness of more than 1790 ℃ and the refractoriness under load of more than 1500 ℃. The waste mullite silicon carbide brick is pretreated, so that other low-melting impurities, mud and other impurities attached to the brick can be removed, the influence on the high-temperature performance of the brick is avoided, iron removal is performed in the crushing process, and the phenomenon that an overproof molten hole is formed on the surface of a product due to the fact that the content of ferric oxide in the raw material is too high and the product is burnt can be reduced.
According to the scheme, the waste mullite silicon carbide brick is prepared by recycling the burnt and used alumina-silicon carbide-silica refractory brick.
According to the scheme, the recovery control indexes of the waste mullite silicon carbide brick are as follows: al (aluminum) 2 O 3 ≥55％，SiC≥7％，Fe 2 O 3 Less than or equal to 1.5 percent. The recovery index refers to mullite AM in YB/T4447-2014 standard, and meanwhile, the waste material contains a certain SiC content. According to the requirement, the mullite brick can be ensured to contain mullite-SiC phase, and the apparent porosity, compressive strength, refractoriness under load and wear resistance of the product are all obviously improved.
According to the scheme, Al is contained in the flint clay particles or the flint clay powder 2 O 3 44-50% of Fe 2 O 3 The content is less than or equal to 1.2 percent. Preferably, the flint clay particles are sorted in a grading manner, are subjected to water tight for 2-3 times, and are crushed and ground after being naturally dried.
According to the scheme, in the silicon micro powder, SiO is contained 2 Content is more than 95 percent, Fe 2 O 3 ≤0.5％。
According to the scheme, Al is contained in Guangxi white mud powder 2 O 3 More than 35% of Fe 2 O 3 The content is less than 2 percent. The Guangxi white mud powder has good plasticity, low impurity content, white color and good cohesiveness.
According to the scheme, the mass percentage concentration of the lignin solution is 1-1.2%.
The preparation method of the high-strength wear-resistant low-porosity clay brick based on the waste mullite silicon carbide brick comprises the following steps:
putting flint clay particle aggregate and lignin solution into a mixing mill for soaking and premixing for 3-5 min, adding waste mullite silicon carbide powder, flint clay powder, silica micropowder and Guangxi white clay fine powder, and mixing for 10-15 min, wherein the mixed clay material can be discharged out of the mill under the condition of no clay mass and no white material; forming the milled mud into a semi-finished brick blank by a friction press, wherein the semi-finished brick blank is required to have compact appearance and no phenomena of cracks, honeycombs, pitted surfaces and the like; and drying the semi-finished product at the temperature of 100-180 ℃ for 24-30 h, and firing at the temperature of 1420-1430 ℃ for 6-8 h to obtain the finished low-porosity clay brick.
The invention provides a high-strength wear-resistant low-porosity clay brick based on waste mullite silicon carbide bricks, which has the excellent characteristics of low porosity, high strength, high refractoriness under load and wear resistance. The waste mullite silicon carbide brick powder in the components is 3Al 2 O 3 ·2SiO 2 The stable structure formed by the cross combination of the mullite crystal structure and the silicon carbide whiskers combines the properties of compact, high refractoriness under load, high strength and low porosity mullite phase with the characteristics of high temperature resistance, wear resistance, scouring resistance and corrosion resistance, and has better crystal performance, more stable structure and more excellent macroscopic performance. Meanwhile, the waste mullite silicon carbide brick is subjected to impurity removal and iron removal pretreatment, so that the phenomenon that substances such as low-melting substances are brought in to influence subsequent performance and an overproof molten hole is formed on the surface of a product caused by sintering due to overhigh content of ferric oxide is prevented. In addition, flint clay component, silica micropowder, abandonment mullite carborundum powder, Guangxi white mud and lignin interpenetration in this application: silicon micropowder, waste mullite silicon carbide powder, Guangxi white mud and flint clay fine powder wrap flint clay particles, and lignin plays a role in lubricating, dispersing and uniformly gathering in the wrapping effect; the fine powder and the particles are mutually and tightly wrapped, then under the action of a high-temperature state, the continuous production of the mullite phase is promoted, the original mullite-silicon carbide phase is continuously wrapped and combined by the newly produced mullite phase, and the silicon carbide crystal structure in the mullite-silicon carbide phase is protected to avoid the oxidation of the silicon carbide crystal structure; finally, newly generating mullite phase at high temperature, and adding excessive Al at certain stage 2 O 3 The corundum phase is remained to form a corundum phase-mullite silicon carbide phase-glass phase structure which is compact, uniform and stable, so that the final clay brick product forms low-porosity poresHigh strength, high refractoriness under load and wear resistance.
The invention has the following beneficial effects:
1. the invention provides a high-strength wear-resistant low-porosity clay brick based on waste mullite silicon carbide bricks, which greatly improves the performance of the wear-resistant low-porosity clay brick by introducing fine powder of the waste mullite silicon carbide bricks and matching with silicon micropowder, waste mullite silicon carbide powder, Guangxi white mud, fine flint clay powder and flint clay particles under the same permeation and synergistic action among the components, and has the compression strength of not less than 70MP, the soft-loading temperature of not less than 1470 ℃, the apparent porosity of not more than 15 percent, the wear resistance value of wear resistance of not more than 8 percent and far superior to the similar low-porosity clay bricks.
2. The waste mullite silicon carbide brick is utilized, so that the performance is improved, a part of flint clay can be replaced, the cost is reduced, the problems of treatment and recycling of industrial garbage are solved, the condition that the mineral resources of the existing flint clay are insufficient is effectively relieved, and the environment-friendly significance and the economic value are important.
3. The preparation process is simple and low in cost, and the obtained clay brick has the characteristics of high strength, low porosity, high refractoriness under load and good wear resistance, has indexes superior to the national standard requirements, has good effect when being used on a blast furnace hot blast stove and an industrial kiln, and has industrial application potential.
Detailed Description
The present invention will be further explained with reference to specific examples.
The raw material indexes used in the following examples are as follows:
sorting the recovered and used alumina-silicon carbide-silica refractory bricks, and removing low-melting substances, slurry, mud and other impurities attached to the surfaces of the alumina-silicon carbide-silica refractory bricks; then the sorted waste mullite silicon carbide brick is subjected to water sealing and cleaning for 3-4 times, then is blown and dried by wind, is crushed, crushed and ground into fine powder with the particle size of less than or equal to 0.088mm, and is subjected to iron removal treatment in the crushing and grinding process to obtain waste mullite silicon carbide brick powder with the index of Al 2 O 3 ≥55％、SiC≥7％、Fe 2 O 3 Less than or equal to 1 percent. Selecting YNS44 brandThe flint clay is respectively crushed into particles of 0-3.5 mm and fine powder of less than 0.088 mm. Selecting silicon micropowder SiO 2 Content is more than 95 percent, Fe 2 O 3 Less than 0.5% of fine powder; guangxi white mud powder Al 2 O 3 More than 35% of Fe 2 O 3 The content is less than 2 percent; the lignin solution concentration was 1.12%.
Example 1
The high-strength wear-resistant low-porosity clay brick based on the waste mullite silicon carbide brick comprises the following components in percentage by mass:
20 wt% of waste mullite silicon carbide brick powder, and the particle size is less than or equal to 0.088 mm;
52 wt% of flint clay particles with the particle size of 0-3.5 mm;
10 wt% of flint clay powder and the particle size of less than or equal to 0.088 mm;
2 wt% of silicon micropowder with the particle size of 0.002-0.005 mm;
10 wt% of Guangxi white mud powder, and the particle size is less than or equal to 0.075 mm;
6 percent of lignin solution.
Mixing the raw materials in a powerful mixer, putting aggregate and lignin into the mixer, soaking and premixing for 3-5 min, adding other fine powder, mixing for 10-15 min, and taking out the mixture without pug or white material. The milled mud is formed into a semi-finished brick blank by a friction press, and the semi-finished brick blank is required to have compact appearance and no phenomena of cracks, honeycombs, pitted surfaces and the like; drying the semi-finished product at 180 deg.C for 28h, and firing at 1425 deg.C for 8h to obtain the final product.
Table 1 shows the comparison of performance indexes of the low-porosity clay bricks with the indexes of ZGN42 and GN42 with the clay brick prepared in the embodiment, and Table 1 shows that the clay brick prepared in the embodiment is superior to the two bricks, the aluminum content, the refractoriness under load and the compressive strength of the clay brick are all higher than those of the ZGN42 and GN42 bricks, and the iron content and the apparent porosity of the clay brick are lower than those of the GN42 brick; the clay brick prepared by the embodiment has good wear resistance, and the ZGN42 brick and the GN42 brick have no wear resistance.
TABLE 1 comparison of Performance index of the existing low-porosity clay brick and the clay brick prepared in this example
Example 2
The preparation method of the high-strength wear-resistant low-porosity clay brick based on the waste mullite silicon carbide brick is the same as that of the example 1, and the brick comprises the following components in percentage by mass:
25 wt% of waste mullite silicon carbide brick powder, and the particle size is less than or equal to 0.088 mm;
55 wt% of flint clay particles with the particle size of 0-3.5 mm;
10 wt% of flint clay powder and the particle size of less than or equal to 0.088 mm;
2 wt% of silicon micropowder with the particle size of 0.002-0.005 mm;
6 wt% of Guangxi white mud powder, and the particle size is less than or equal to 0.075 mm;
2 percent of lignin solution.
Example 3
The preparation method of the high-strength wear-resistant low-porosity clay brick based on the waste mullite silicon carbide brick is the same as that of the example 1, and the brick comprises the following components in percentage by mass:
20 wt% of waste mullite silicon carbide brick powder, and the particle size is less than or equal to 0.088 mm;
55 wt% of flint clay particles with the particle size of 0-3.5 mm;
15 wt% of flint clay powder and the particle size of less than or equal to 0.088 mm;
1.5 wt% of silicon micropowder with the particle size of 0.002-0.005 mm;
5.5 wt% of Guangxi white mud powder, and the particle size is less than or equal to 0.075 mm;
3% of lignin solution.
Example 4
The preparation method of the high-strength wear-resistant low-porosity clay brick based on the waste mullite silicon carbide brick is the same as that of example 1, and the brick comprises the following components in percentage by mass:
26 wt% of waste mullite silicon carbide brick powder, and the particle size is less than or equal to 0.088 mm;
50 wt% of flint clay particles with the particle size of 0-3.5 mm;
15 wt% of flint clay powder and the particle size of less than or equal to 0.088 mm;
1.5 wt% of silicon micropowder with the particle size of 0.002-0.005 mm;
4 wt% of Guangxi white mud powder, and the particle size is less than or equal to 0.075 mm;
3.5 percent of lignin solution.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The high-strength wear-resistant low-porosity clay brick based on the waste mullite silicon carbide brick is characterized by comprising the following components in percentage by mass:
15-30 wt% of waste mullite silicon carbide brick powder, and the particle size is less than or equal to 0.088 mm;
40-60 wt% of flint clay particles with the particle size of 0-3.5 mm;
10-25 wt% of flint clay powder and the particle size of less than or equal to 0.088 mm;
0-2 wt% of silicon micropowder with a particle size of 0.002-0.005 mm;
4-15 wt% of Guangxi white mud powder, and the particle size is less than or equal to 0.075 mm;
2-6% of a lignin solution; wherein:
the preparation method of the waste mullite silicon carbide brick powder comprises the following steps: sorting, separating and removing impurities from the waste mullite silicon carbide bricks, then carrying out water sealing and cleaning for 3-4 times, then blowing and airing, crushing and grinding the waste mullite silicon carbide bricks into fine powder with the particle size of less than or equal to 0.088mm, and carrying out iron removal treatment in the crushing process.
2. The low porosity clay brick according to claim 1, wherein the waste mullite silicon carbide brick is a recycled calcined and used alumina-silicon carbide-silica based refractory brick.
3. The low pore clay brick as claimed in claim 1, wherein the recovery control indexes of the waste mullite silicon carbide brick are as follows: al (Al) 2 O 3 ≥55％，SiC≥7％，Fe 2 O 3 ≤1.5％。
4. The low pore clay brick as claimed in claim 1, wherein Al is contained in the flint clay particles or flint clay powder 2 O 3 44-50% of Fe 2 O 3 The content is less than or equal to 1.2 percent.
5. The low pore clay brick as claimed in claim 1, wherein SiO is contained in the fine silica powder 2 Content is more than 95 percent, Fe 2 O 3 ≤0.5％。
6. The low pore clay brick as claimed in claim 1, wherein Al is contained in the Guangxi white clay powder 2 O 3 More than 35% of Fe 2 O 3 The content is less than 2 percent.
7. The low-porosity clay brick as claimed in claim 1, wherein the concentration of the lignin solution is 1-1.2%.
8. The preparation method of the high-strength wear-resistant low-porosity clay brick based on the waste mullite silicon carbide brick as claimed in any one of claims 1 to 7, is characterized by comprising the following steps:
putting flint clay particle aggregate and lignin solution into a mixing mill for soaking and premixing for 3-5 min, adding waste mullite silicon carbide powder, flint clay powder, silica micropowder and Guangxi white clay fine powder, and mixing for 10-15 min, wherein the mixed clay material can be discharged out of the mill under the condition of no clay mass and no white material; forming the milled mud into a semi-finished brick blank by a friction press; and drying the semi-finished product at the temperature of 100-180 ℃ for 24-30 h, and firing at the temperature of 1420-1430 ℃ for 6-8 h to obtain the finished low-porosity clay brick.
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| CN104072173A (en) * | 2014-07-16 | 2014-10-01 | 山国强 | Flint clay brick and preparation method |
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| CN113998986A (en) | 2022-02-01 |
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