CN113651626A - High-quality silica brick for hot blast stove and preparation method thereof - Google Patents
High-quality silica brick for hot blast stove and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-quality silica brick for a hot blast stove. The method comprises the following steps: 60-70 parts of silica particles, 10-20 parts of silica powder, 5-15 parts of waste silica bricks, a mineralizer, a bonding agent and an additive, wherein the mineralizer comprises 6-7 parts of lime milk and 0.3-0.8 part of silicon nitride powder, the bonding agent is 4-10 parts by weight, and the additive comprises 3-5 parts of white carbon black and 3-5 parts of micro silicon powder. The prepared product is a high-quality silica brick with the silicon dioxide content of more than 96 percent, and has the excellent normal-temperature compressive strength, refractoriness under load and residual quartz of the traditional 96 silica brick, and also has the excellent characteristic of small thermal linear expansion rate of the traditional 95 silica brick; the yield is high, and the rejection rate is low, and traditional qualification rate is about 96%, and the qualification rate of the technical scheme of this application is more than 98%.
Description
Technical Field
The invention belongs to the technical field of silica bricks, and particularly relates to a high-quality silica brick for a hot blast stove and a preparation method thereof.
Background
The silica brick belongs to an acid refractory material, has good acid slag corrosion resistance, and is prepared by taking silica as a raw material and adding a proper amount of mineralizer such as iron scale, fluorite and bentonite to promote the conversion of quartz in a blank into tridymite, and finally preparing the qualified silica brick, wherein the mineralizer is mostly the iron scale, the bentonite and the like. SiO in silica2The higher the content, the higher the refractoriness. The most harmful impurity is Al2O3、K2O、Na2O, etc., which severely reduce the refractoriness of the product.
The silica bricks are divided into general silica bricks, silica bricks for glass kilns, silica bricks for coke ovens and silica bricks for hot blast furnaces according to the application, and are divided into the following brands according to rational indexes: general silica brick: GZ-94; silica brick for glass kiln: BG-96a, BG-96b and BG-95; silica brick for coke oven: JG-94; silica brick RG-95 for hot blast stove.
The silica brick for the hot blast stove is applied to the hot blast stove matched with the blast furnace, the hot blast stove has the function of continuously providing high-temperature hot blast with the temperature of more than 1000 ℃ for the blast furnace, the furnace temperature of the current hot blast stove is 1200 ℃, and the higher furnace temperature is basically 1300 ℃, but the practice shows that the hot blast temperature can be reduced by 10-20kg/t of iron when being increased by 100 ℃, and the temperature of the hot blast stove in the future can be higher and can reach 1600 ℃. The existing hot blast stove uses RG-95 silica bricks, the thermal expansion rate can not meet the use requirements, in addition, because the purity is low, the high temperature indexes such as refractoriness, refractoriness under load and the like are insufficient, if a product with higher high temperature performance is to be obtained, the content of silicon dioxide needs to be increased, and once the content of silicon dioxide is increased, the thermal expansion rate can be further increased. Thereby affecting the high temperature index, the service performance and the product percent of pass in the production process.
Through search, the invention patent with the application number of CN200810049567.2 discloses a nano composite silica brick and a preparation method thereof. The raw materials and the binding agent are silica particles and fine powder, waste silica brick particles, nano calcium carbonate, nano iron oxide, nano silicon dioxide, lime, fluorite powder and sulfurous acid waste paper pulp liquid. It is composed ofIt is also pointed out that the lime milk solution is easy to flocculate and not easy to disperse, so that the lime milk solution has poor effect as a mineralizer, and volume expansion of the silica brick caused by crystal transformation in the firing process is inhibited by introducing nano calcium carbonate, nano iron oxide and nano silicon dioxide, adaptive transformation is promoted, porosity is reduced, volume density is improved, sintering is promoted, strength is improved, and thermal shock resistance is improved. The porosity is 16.5-19.2%, and the volume density is 1.96g/cm3-2.07g/cm3The compression strength is 61.0MPa-65.5MPa, the residual quartz is 0.3% -0.5%, the qualification rate of finished products is 92% -96%, the qualification rate of finished products is lower, and the thermal expansion coefficient of the brick is not good enough in practical use, which is judged according to parameters such as the compression strength and the like.
The invention patent with the application number of CN201410631575.3 discloses an ultrahigh heat-conducting silica brick for a furnace wall of a coke oven carbonization chamber and a preparation method thereof. The raw materials of the composite material comprise crystalline silica, fused quartz, waste silica bricks, silicon nitride, an additive, a water reducing agent and a bonding agent, wherein the additive is a mixture of potassium feldspar, clay and fluorite, the water reducing agent is sodium tripolyphosphate, and the bonding agent is pulp waste liquid. The bulk density of the powder is 1.85-1.90g/cm3The porosity: 17 to 20 percent, the refractoriness under load is more than or equal to 1650 ℃, the heat conductivity is 2.50 to 2.60W/m.K, the tridymite content is about 70 percent, the pore diameter of the pores is mainly distributed in the range of 9 to 25 mu m, the average pore diameter size is about 3 mu m smaller than that of the traditional silica brick, the mass fraction of the silicon dioxide is 95.2 to 95.9 percent, and the compressive strength is 61 to 65 MPa.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention firstly provides a high-quality silica brick for a hot blast stove and secondly provides a preparation method of the high-quality silica brick for the hot blast stove.
A high-quality silica brick for a hot blast stove comprises: 60-70 parts of silica particles, 10-20 parts of silica powder, 5-15 parts of waste silica bricks, and also comprises 4-10 parts of a mineralizer, a bonding agent and an additive, wherein the mineralizer comprises 0.3-0.8 part of silicon nitride and 6-7 parts of lime milk, and the additive comprises 3-5 parts of white carbon black and 3-5 parts of micro silicon powder. The particle size of the micro silicon powder is less than 5 mu m.
The white carbon black is amorphous fine powder, has a flocculent or similar reticular quasi-particle crystal structure, has the particle size of 5-25 mu m, small particle size and large specific surface area, can reduce the impurity concentration of an interface to a great extent, and improves the mechanical property.
Further, the binding agent is one or a mixture of silica sol and white dextrin.
Further, the particle size of the silica particles is more than 0.08mm and less than 3 mm; the particle size of the silica powder is below 0.08 mm; the granularity of the waste silica bricks is below 1 mm; the granularity of the silicon nitride powder is below 0.088 mm; the particle size of the white carbon black is below 5 mu m.
Furthermore, in the silica particles, the mass fraction of silicon dioxide is more than 99 percent; in the silica powder, the mass fraction of silicon dioxide is more than 99 percent; in the waste silica brick, the mass fraction of the silicon dioxide is more than 95 percent.
A preparation method of high-quality silica bricks for a hot blast stove comprises the following steps: firstly, uniformly mixing silica particles, silica powder and waste silica bricks in a wet mill, then adding a mineralizer, a bonding agent and an additive, and uniformly mixing; pressing into a blank by a brick press, and then conveying the blank into a dryer with the temperature of 100-120 ℃ for drying for 24 hours; and (3) drying, putting into a kiln, sintering at high temperature, keeping the temperature for 30 hours at the average heating rate of 15 ℃/h and the maximum sintering temperature of 1450 ℃, cooling to normal temperature at the average cooling rate of 20 ℃/h, and discharging the product out of the kiln.
Further, when the brick is pressed into a blank by a brick press, the brick press used is a 400-ton and 600-ton brick press.
Compared with the prior art, the invention has the following beneficial effects: 1. the prepared product is a high-quality silica brick with the silicon dioxide content of more than 96 percent, integrates the advantages of 95 silica bricks and 96 silica bricks, improves the strength, the refractoriness under load, the true density and the porosity, improves the normal and high temperature indexes of the product compared with the 95 silica brick under the condition of improving the silicon content, and simultaneously reduces the thermal expansion from 1.35 percent to less than 1.25 percent. Overcomes the contradiction that the increase of the silicon content easily causes large thermal expansion rate. 2. The problems that the higher the silicon content is, the better the crystal form conversion is controlled, and the lower the yield is are solved, the traditional yield is about 90-96%, and the yield of the technical scheme of the application is more than 98%.
Detailed Description
The present invention will be further explained with reference to specific examples. The following examples are merely illustrative of the present invention, and are not intended to limit the present invention, and all the technical solutions obtained by simple replacement and superposition based on the present invention shall fall within the protection scope of the present invention.
Example 1
A high-quality silica brick for a hot blast stove comprises: 60 parts of silica particles, 20 parts of silica powder, 10 parts of waste silica bricks, a mineralizer, a bonding agent and an additive, wherein the bonding agent is 10 parts by weight, the mineralizer comprises 0.8 part by weight of silicon nitride and 7 parts by weight of lime milk, and the additive comprises 3 parts by weight of white carbon black and 5 parts by weight of silica fume. The particle size of the micro silicon powder is less than 5 mu m.
Further, the binding agent is a silica sol binding agent.
Further, the particle size of the silica particles was 0.088 mm; the particle size of the silica powder is 0.053 mm; the granularity of the waste silica bricks is 0.045 mm; the granularity of the silicon nitride powder is 0.053 mm; the particle size of the white carbon black is below 5 mu m.
Further, in the silica particles, the mass fraction of silicon dioxide is 99%; in the silica powder, the mass fraction of silicon dioxide is 99 percent; in the waste silica brick, the mass fraction of the silicon dioxide is 95 percent.
A preparation method of high-quality silica bricks for a hot blast stove comprises the following steps: firstly, uniformly mixing silica particles, silica powder and waste silica bricks in a wet mill, then adding a mineralizer, a bonding agent and an additive, and uniformly mixing; pressing into a blank by a brick press machine, and then conveying the blank into a dryer with the temperature of 100 ℃ for drying for 24 hours; and (3) drying, putting into a kiln, sintering at high temperature, keeping the temperature for 30 hours at the average heating rate of 15 ℃/h and the maximum sintering temperature of 1450 ℃, cooling to normal temperature at the average cooling rate of 20 ℃/h, and discharging the product out of the kiln.
Further, when the green brick is pressed by a brick press, the brick press used is a 400-ton brick press.
SiO of the finally fired high quality silica brick of this example2Mass fraction of 96.0 percent, the content of cristobalite is 45 percent, the thermal expansion rate is 1.23 percent, the refractoriness under load is 1655 ℃, and the true density is 2.28g/cm3The creep rate is 0.8 percent, the residual quartz is 1.3 percent, the apparent porosity is 20 percent, the normal-temperature compressive strength is 40MPa, and the qualification rate is 98 percent.
Comparative example 1
The technical scheme of the comparative example is basically the same as that of example 1, only 1.2 parts by weight of fluorite and 6.6 parts by weight of iron scale are replaced by the mineralizer, and SiO in the high-quality silica brick fired by the same preparation method2The mass fraction of (A) is 95.0%, the thermal expansion rate is 1.26%, the refractoriness under load is 1640 ℃, and the true density is 2.23g/cm3The creep rate is 1.0 percent, the residual quartz is 1.5 percent, the apparent porosity is 23 percent, the normal-temperature compressive strength is 31MPa, and the qualification rate is 94 percent.
Example 2
A high-quality silica brick for a hot blast stove comprises: 66 parts of silica particles, 10 parts of silica powder and 10 parts of waste silica bricks, and also comprises a mineralizer, a bonding agent and an additive, wherein the bonding agent is 4 parts by weight, the mineralizer comprises 0.8 part by weight of silicon nitride and 6 parts by weight of lime milk, and the additive comprises 5 parts by weight of white carbon black and 3 parts by weight of silica fume. The particle size of the micro silicon powder is less than 5 mu m.
Further, the binding agent is white dextrin.
Further, the silica particles had a particle size of 3 mm; the particle size of the silica powder is 0.088 mm; the granularity of the waste silica bricks is 1 mm; the granularity of the silicon nitride powder is 0.088 mm; the particle size of the white carbon black is below 5 mu m.
Further, in the silica particles, the mass fraction of silicon dioxide is 99.3%; in the silica powder, the mass fraction of silicon dioxide is 99.5 percent; in the waste silica brick, the mass fraction of the silicon dioxide is 96 percent.
A preparation method of high-quality silica bricks for a hot blast stove comprises the following steps: firstly, uniformly mixing silica particles, silica powder and waste silica bricks in a wet mill, then adding a mineralizer, a bonding agent and an additive, and uniformly mixing; pressing into a blank by a brick press machine, and then conveying the blank into a dryer with the temperature of 120 ℃ for drying for 24 hours; and (3) drying, putting into a kiln, sintering at high temperature, keeping the temperature for 30 hours at the average heating rate of 15 ℃/h and the maximum sintering temperature of 1450 ℃, cooling to normal temperature at the average cooling rate of 20 ℃/h, and discharging the product out of the kiln.
Further, when the green brick is pressed by a brick press, the brick press used is a 600-ton brick press.
SiO of the finally fired high quality silica brick of this example296.3 percent of mass fraction, 45 percent of cristobalite content, 1.22 percent of thermal expansion rate, 1660 ℃ of refractoriness under load and 2.1g/cm of true density3The creep rate is 0.6 percent, the residual quartz is 1.0 percent, the apparent porosity is 18 percent, the normal-temperature compressive strength is 48MPa, and the qualification rate is 99.20 percent.
Comparative example 2
The technical scheme of the comparative example is basically the same as that of the example 2, only the mineralizer is replaced by 3.7 weight parts of fluorite and 3.1 weight parts of iron scale, and SiO in the high-quality silica brick fired by the same preparation method2The mass fraction of (A) is 95.0%, the thermal expansion rate is 1.26%, the refractoriness under load is 1640 ℃, and the true density is 2.01g/cm3The creep rate is 1.0 percent, the residual quartz is 1.5 percent, the apparent porosity is 23 percent, the normal-temperature compressive strength is 31MPa, and the qualification rate is 94 percent.
Example 3
A high-quality silica brick for a hot blast stove comprises: 70 parts of silica particles, 14 parts of silica powder, 20 parts of waste silica bricks, 8 parts of a mineralizer, a bonding agent and an additive, wherein the mineralizer comprises 0.5 part of silicon nitride and 6.7 parts of lime milk, and the additive comprises 4 parts of white carbon black and 4 parts of silica fume. The particle size of the micro silicon powder is less than 5 mu m.
Further, the binding agent is white dextrin.
Further, the particle size of the silica particles was 1.4 mm; the particle size of the silica powder is 0.063 mm; the granularity of the waste silica bricks is 0.053 mm; the granularity of the silicon nitride powder is 0.053 mm; the particle size of the white carbon black is below 5 mu m.
Further, in the silica particles, the mass fraction of silicon dioxide is 99.6%; in the silica powder, the mass fraction of silicon dioxide is 99.1%; in the waste silica brick, the mass fraction of the silicon dioxide is 97 percent.
A preparation method of high-quality silica bricks for a hot blast stove comprises the following steps: firstly, uniformly mixing silica particles, silica powder and waste silica bricks in a wet mill, then adding a mineralizer, a bonding agent and an additive, and uniformly mixing; pressing into a blank by a brick press, and then conveying the blank into a dryer with the temperature of 110 ℃ for drying for 24 hours; and (3) drying, putting into a kiln, sintering at high temperature, keeping the temperature for 30 hours at the average heating rate of 15 ℃/h and the maximum sintering temperature of 1450 ℃, cooling to normal temperature at the average cooling rate of 20 ℃/h, and discharging the product out of the kiln.
Further, when the green brick is pressed by a brick press, the brick press used is a 400-ton brick press.
SiO of the finally fired high quality silica brick of this example296.1 percent of mass fraction, 43 percent of cristobalite content, 1.25 percent of thermal expansion rate, 1665 percent of refractoriness under load and 2.2g/cm of true density3The creep rate is 0.7 percent, the residual quartz is 1.1 percent, the apparent porosity is 19 percent, the normal-temperature compressive strength is 45MPa, and the qualification rate is 98 percent.
Comparative example 3
The technical scheme of the comparative example is basically the same as that of the example 3, only the mineralizer is replaced by 3.6 weight parts of fluorite and 3.6 weight parts of iron scale, and SiO in the high-quality silica brick fired by the same preparation method2The mass fraction of (A) is 95.0%, the thermal expansion rate is 1.26%, the refractoriness under load is 1640 ℃, and the true density is 2.15g/cm3The creep rate is 1.0 percent, the residual quartz is 1.5 percent, the apparent porosity is 23 percent, the normal-temperature compressive strength is 31MPa, and the qualification rate is 94 percent.
Example 4
A high-quality silica brick for a hot blast stove comprises: 67 parts of silica particles, 11 parts of silica powder, 18 parts of waste silica bricks, a mineralizer, a bonding agent and an additive, wherein the bonding agent is 6 parts by weight, the mineralizer comprises 0.6 part by weight of silicon nitride and 6.9 parts by weight of lime milk, and the additive comprises 4 parts by weight of white carbon black and 3 parts by weight of silica fume. The particle size of the micro silicon powder is less than 5 mu m.
Further, the binding agent is silica sol.
Further, the particle size of the silica particles was 1.7 mm; the particle size of the silica powder is 0.075 mm; the granularity of the waste silica bricks is 0.075 mm; the granularity of the silicon nitride powder is 0.063 mm; the particle size of the white carbon black is below 5 mu m.
Further, in the silica particles, the mass fraction of silicon dioxide is 99.2%; in the silica powder, the mass fraction of silicon dioxide is 99 percent; in the waste silica brick, the mass fraction of the silicon dioxide is 95 percent.
A preparation method of high-quality silica bricks for a hot blast stove comprises the following steps: firstly, uniformly mixing silica particles, silica powder and waste silica bricks in a wet mill, then adding a mineralizer, a bonding agent and an additive, and uniformly mixing; pressing into a blank by a brick press machine, and then conveying the blank into a dryer with the temperature of 120 ℃ for drying for 24 hours; and (3) drying, putting into a kiln, sintering at high temperature, keeping the temperature for 30 hours at the average heating rate of 15 ℃/h and the maximum sintering temperature of 1450 ℃, cooling to normal temperature at the average cooling rate of 20 ℃/h, and discharging the product out of the kiln.
Further, when the green brick is pressed by a brick press, the brick press used is a 500-ton brick press.
SiO of the finally fired high quality silica brick of this example296.2 percent of mass fraction, 40 percent of cristobalite content, 1.24 percent of thermal expansion rate, 1660 ℃ of refractoriness under load and 2.2g/cm of true density3The creep rate is 0.7 percent, the residual quartz is 1.1 percent, the apparent porosity is 21 percent, the normal-temperature compressive strength is 43MPa, and the qualification rate is 98 percent.
Comparative example 4
The technical scheme of the comparative example is basically the same as that of the example 4, only the mineralizer is replaced by 3.3 parts by weight of iron scale and 4.2 parts by weight of bentonite, and SiO in the high-quality silica brick fired by the same preparation method2Has a mass fraction of 95.4%, a thermal expansion rate of 1.30%, a refractoriness under load of 1645 ℃ and a true density of 2.16g/cm3The creep rate is 0.9 percent, the residual quartz is 1.6 percent, the apparent porosity is 23 percent, the normal-temperature compressive strength is 35MPa, and the qualification rate is 95.4 percent.
Example 5
A high-quality silica brick for a hot blast stove comprises: 64 parts of silica particles, 19 parts of silica powder, 12 parts of waste silica bricks, 10 parts of a mineralizer, a bonding agent and an additive, wherein the mineralizer comprises 0.3 part of silicon nitride and 6 parts of lime milk, and the additive comprises 3 parts of white carbon black and 5 parts of silica fume. The particle size of the micro silicon powder is less than 5 mu m.
Further, the binding agent is prepared from silica sol and white dextrin according to the mass ratio of 3: 1.
Further, the silica particles have a particle size of 1 mm; the particle size of the silica powder is 0.063 mm; the granularity of the waste silica bricks is 0.053 mm; the granularity of the silicon nitride powder is 0.075 mm; the particle size of the white carbon black is below 5 mu m.
Further, in the silica particles, the mass fraction of silicon dioxide is 99%; in the silica powder, the mass fraction of silicon dioxide is 99.3 percent; in the waste silica brick, the mass fraction of the silicon dioxide is 95.3 percent.
A preparation method of high-quality silica bricks for a hot blast stove comprises the following steps: firstly, uniformly mixing silica particles, silica powder and waste silica bricks in a wet mill, then adding a mineralizer, a bonding agent and an additive, and uniformly mixing; pressing into a blank by a brick press machine, and then conveying the blank into a dryer with the temperature of 120 ℃ for drying for 24 hours; and (3) drying, putting into a kiln, sintering at high temperature, keeping the temperature for 30 hours at the average heating rate of 15 ℃/h and the maximum sintering temperature of 1450 ℃, cooling to normal temperature at the average cooling rate of 20 ℃/h, and discharging the product out of the kiln.
Further, when the green brick is pressed by a brick press, the brick press used is a 400-ton brick press.
SiO of the finally fired high quality silica brick of this example296.1% by mass, 42% by mass of cristobalite, 1.25% by thermal expansion rate, 1655 ℃ refractoriness under load, and 2.28g/cm true density3The creep rate is 0.73 percent, the residual quartz is 1.2 percent, the apparent porosity is 20 percent, the normal-temperature compressive strength is 42MPa, and the qualification rate is 98.1 percent.
Comparative example 5
The technical scheme of the comparative example is basically the same as that of the example 5, only the mineralizer is replaced by 3.4 parts by weight of fluorite and 2.9 parts by weight of bentonite, and SiO in the high-quality silica brick fired by the same preparation method2Has a mass fraction of 95.3%, a thermal expansion rate of 1.27%, a refractoriness under load of 1645 ℃ and a true density of 2.24g/cm3The creep rate is 0.9 percent, the residual quartz is 1.7 percent, the apparent porosity is 23 percent, the normal-temperature compressive strength is 39MPa, and the qualification rate is 95 percent.
The parts by weight and particle size of the components of examples 1-5 are shown in Table 1.
The indices of the products obtained in examples 1 to 5 are shown in Table 2.
TABLE 1 parts by weight and particle size of the components of examples 1-5
TABLE 2 indices of the products obtained in examples 1 to 5
| Index (I) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| SiO2Mass fraction (%) | 96 | 96.3 | 96.1 | 96.2 | 96.1 |
| Cristobalite content (%) | 45 | 45 | 43 | 40 | 42 |
| Thermal expansion Rate (%) | 1.23 | 1.22 | 1.25 | 1.24 | 1.25 |
| Refractoriness under load (. degree.C.) | 1655 | 1660 | 1665 | 1660 | 1655 |
| True density (g/cm)3) | 2.28 | 2.1 | 2.2 | 2.2 | 2.28 |
| Creep rate (%) | 0.8 | 0.6 | 0.7 | 0.7 | 0.73 |
| Residual quartz (%) | 1.3 | 1 | 1.1 | 1.1 | 1.2 |
| Apparent porosity (%) | 20 | 18 | 19 | 21 | 20 |
| Normal temperature compressive strength (MPa) | 40 | 48 | 45 | 43 | 42 |
| Percent pass (%) | 98 | 99.2 | 98 | 98 | 98.1 |
Claims (6)
1. A high-quality silica brick for a hot blast stove is characterized in that: the method comprises the following steps: 60-70 parts of silica particles, 10-20 parts of silica powder, 5-15 parts of waste silica bricks, a mineralizer, a bonding agent and an additive, wherein the mineralizer comprises 6-7 parts of lime milk and 0.3-0.8 part of silicon nitride powder, the bonding agent is 4-10 parts by weight, and the additive comprises 3-5 parts of white carbon black and 3-5 parts of micro silicon powder.
2. The high-quality silica brick for a hot blast stove according to claim 1, wherein: the binding agent is one or a mixture of two of silica sol and white dextrin.
3. The high-quality silica brick for a hot blast stove according to claim 1, wherein: the particle size of the silica particles is greater than 0.08mm and less than 3 mm; the particle size of the silica powder is below 0.08 mm; the granularity of the waste silica bricks is below 1 mm; the granularity of the silicon nitride powder is below 0.088 mm; the particle size of the white carbon black is below 5 mu m.
4. The high-quality silica brick for a hot blast stove according to claim 1, wherein: the silica particles have a silica mass fraction of 99% or more; in the silica powder, the mass fraction of silicon dioxide is more than 99 percent; in the waste silica brick, the mass fraction of the silicon dioxide is more than 95 percent.
5. A method for producing a high-quality silica brick according to any one of claims 1 to 4, characterized in that: firstly, uniformly mixing silica particles, silica powder and waste silica bricks in a wet mill, then adding a mineralizer, a bonding agent and an additive, and uniformly mixing; pressing into a blank by a brick press, and then conveying the blank into a dryer with the temperature of 100-120 ℃ for drying for 24 hours; and (3) drying, putting into a kiln, sintering at high temperature, keeping the temperature for 30 hours at the average heating rate of 15 ℃/h and the maximum sintering temperature of 1450 ℃, cooling to normal temperature at the average cooling rate of 20 ℃/h, and discharging the product out of the kiln.
6. The method for preparing high-quality silica bricks for a hot blast stove according to claim 5, characterized in that: when the brick is pressed into a blank by a brick press, the brick press used is a 400-ton brick press and a 600-ton brick press.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114890799A (en) * | 2022-04-26 | 2022-08-12 | 山东耐火材料集团有限公司 | Special-shaped and large-sized silica brick and production method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4183761A (en) * | 1977-09-10 | 1980-01-15 | Kurosaki Refractories Co., Ltd. | Silica bricks and method for manufacturing silica bricks |
| CN102167606A (en) * | 2011-01-21 | 2011-08-31 | 武汉科技大学 | Silica brick and preparation method thereof |
| CN102515801A (en) * | 2011-12-20 | 2012-06-27 | 浙江照山硅质耐火材料有限公司 | Silica brick for glass furnace |
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2021
- 2021-09-26 CN CN202111128293.8A patent/CN113651626A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4183761A (en) * | 1977-09-10 | 1980-01-15 | Kurosaki Refractories Co., Ltd. | Silica bricks and method for manufacturing silica bricks |
| CN102167606A (en) * | 2011-01-21 | 2011-08-31 | 武汉科技大学 | Silica brick and preparation method thereof |
| CN102515801A (en) * | 2011-12-20 | 2012-06-27 | 浙江照山硅质耐火材料有限公司 | Silica brick for glass furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114890799A (en) * | 2022-04-26 | 2022-08-12 | 山东耐火材料集团有限公司 | Special-shaped and large-sized silica brick and production method thereof |
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