CN107879732B - Dispersive breathable refractory material and preparation method thereof - Google Patents
Dispersive breathable refractory material and preparation method thereof Download PDFInfo
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- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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Abstract
The invention relates to a dispersion type breathable refractory material and a preparation method thereof. The technical scheme is as follows: the raw materials of the breathable refractory material consist of aggregate and matrix; 60-75 wt% of tabular corundum particles and 2-10 wt% of mixed particles are used as aggregate, and 10-25 wt% of white corundum fine powder, 5-10 wt% of calcined alumina micro powder, 3-10 wt% of bonding agent and 1-3 wt% of silicon micro powder are used as matrix. Mixing the following components in percentage by weight: firstly, mixing a water reducing agent accounting for 0.1-0.3 wt% of the raw material with the silica micropowder, then mixing with the rest matrix, stirring, then mixing with the aggregate, stirring, finally adding water accounting for 5-10 wt% of the raw material, stirring, casting, molding, curing and drying; and (3) preserving the heat for 3-4 hours at 1400-1600 ℃ to obtain the dispersion type breathable refractory material. The invention has simple process, low cost, high production efficiency and no pollution to the environment, and the prepared product has good air permeability, small pore diameter, uniform pore distribution, low firing line change rate, high strength and obvious impurity removal effect.
Description
Technical Field
The invention belongs to the technical field of breathable refractory materials. In particular to a dispersion type breathable refractory material and a preparation method thereof.
Background
With the wide application of the bubble metallurgy technology, inert gas is blown into molten steel through the dispersion type breathable refractory material, so that the flowing of the molten steel can be improved, the stirring of the molten steel and the uniform temperature of the molten steel are promoted, bubbles are beneficial to capture impurities, the floating of the impurities is promoted, and particularly, the removal effect of the bubbles with the diameter of less than 2mm on micro impurities is more remarkable. Blowing micro-bubbles into a steel ladle and a tundish through an annular dispersion type permeable refractory material is a new smelting process proposed in recent years: in the process of pouring the steel ladle, when the height of the liquid level of molten steel pouring in the steel ladle is 150-400 mm, the argon blowing pressure is controlled to be 0.2-0.7 MPa, so that argon is blown into the molten steel through an annular breathable refractory material to inhibit the slag falling of the steel ladle; "a ventilative mouth of a river brick cup in middle of continuous casting package" (CN204035547U), through be provided with ventilative ring in the epirelief of mouth of a river brick cup body, after blowing in argon gas, argon gas sees through ventilative ring and forms annular air curtain barrier around the mouth of a river, carry out the gas scrubbing to the molten steel that will get into the mouth of a river, the inclusion come-up is promoted and is got rid of, the mouth of a river trepanning problem has effectively been slowed down, the continuous casting furnace number of low carbon aluminium killed steel of package production in the middle of the slab caster has been improved, this annular ventilative refractory material is dispersion type refractory material, it has almost no volume change to require refractory material goods to burn the in-process, otherwise easy fracture.
At present, the dispersive type breathable refractory material mostly adopts corundum-spinel and corundum-mullite materials, and the patent technology of 'a tundish breathable brick and a preparation method thereof' (CN1699267A) adds mullite in the form of dry gel powder to generate mullite whiskers, so that the strength is increased while the higher breathability is maintained, but the dry gel powder of the mullite is not easy to diffuse, so that air holes are unevenly distributed; the patent technology of a dispersive air brick (CN200810127079.9) is characterized in that an organic micropore foaming agent is added, the dispersive corundum-spinel air brick and a preparation method thereof (CN201710013255.5) and the high-strength dispersive air brick and a preparation method thereof (CN201710393482.5) mainly depend on the addition of a micropore forming agent, uniformly distributed micropores are left in a material after high-temperature firing, the air permeability of the material is improved, but the micropore forming agent is difficult to be uniformly dispersed, so that the pores are difficult to be uniformly distributed, the process is difficult to control, and gas generated by a burnout method pollutes the environment.
The patent technology of 'a high blow-through rate air brick and a preparation method thereof' (CN201410094948.8) is characterized in that through controlling grain composition and micro-pore forming agent, a machine pressing mode is adopted, so that micropores which are uniformly distributed and communicated with each other are formed in an air brick body after high-temperature sintering, but the machine pressing forming cost is high, the process is not easy to control, and the material sintering process is accompanied with wired change; "a dispersive air brick and its preparation method" (CN201610199792.9) adopts the board corundum of the equal granularity granule that the granularity is 2-5 mm as the aggregate, pile up and form the dispersive gas channel through the board corundum of the same granularity, has increased the air permeability of the ventilative refractory material, but its intensity is low, the aperture formed is great, unfavorable to the tiny bubble to form, the firing line changes greatly, it is difficult to prepare some ventilative rings, water gap ventilative components, etc. and the dispersive air permeable refractory material that the change of firing line requires extremely high.
At present, pores are uniformly distributed in a material after the material is sintered at high temperature by adding a pore-forming agent, so that the air permeability of the material is improved, but the pores are difficult to distribute uniformly due to the difficulty in uniformly dispersing the pore-forming agent, the process is difficult to control, and the environment is polluted by gas generated by a burnout method; the permeable refractory material with dispersed pores formed by continuous graded accumulation is easy to form more closed pores, even if a micro-pore forming agent is added, the closed pores are difficult to communicate, so that the pores are not uniformly distributed, and a good permeable effect cannot be achieved; and the dispersive gas channel is formed by adopting the equal-granularity aggregate with single granularity of 2-5 mm, so that the gas permeability of the material is improved, but the material is low in strength, the formed aperture is large, the formation of micro bubbles is not facilitated, the change of a firing line is large, and the dispersive gas-permeable refractory material with small size, high requirement on the change of the firing line, such as a gas-permeable ring, a water gap gas-permeable element and the like, almost has no volume change in the firing process of the product, otherwise, the product is easy to crack.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and aims to provide a preparation method of a dispersion type breathable refractory material which is simple in process, low in cost, high in production efficiency and free of pollution to the environment.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following specific steps:
the dispersion type breathable refractory material comprises the following raw materials in percentage by weight: 60-75 wt% of tabular corundum particles and 2-10 wt% of mixed particles are used as aggregate, and 10-25 wt% of white corundum fine powder, 5-10 wt% of calcined alumina micro powder, 3-10 wt% of bonding agent and 1-3 wt% of silicon micro powder are used as matrix.
The preparation method of the dispersion type breathable refractory material comprises the following steps: uniformly mixing a water reducing agent accounting for 0.1-0.3 wt% of the raw material with the silicon micropowder to obtain a premix; mixing the premix with the rest of the matrix, and stirring for 3-5 minutes to obtain a premixed matrix material; then mixing the premixed matrix material with the aggregate, stirring for 3-5 minutes, adding 5-10 wt% of water into the raw material, stirring for 3-5 minutes, casting and molding, maintaining at normal temperature for 22-28 hours, and drying at 100-120 ℃ for 22-28 hours; and (3) preserving the heat for 3-4 hours at 1400-1600 ℃ to obtain the dispersion type breathable refractory material.
The granularity of the plate-shaped corundum particles is 0.5-1 mm.
The mixed particles are: mixing kyanite, andalusite and sillimanite according to the mass ratio of 1: 1-5, wherein the kyanite, the andalusite and the sillimanite are prepared by mixing, and the mixed particles contain Al of the kyanite, the andalusite and the sillimanite2O3The content is respectively more than 56 wt%; the particle size of the mixed particles is 0.125-0.250 mm.
Al of the plate-like corundum particles2O3Content (wt.)>95wt％。
Al of the white corundum fine powder2O3Content (wt.)>99 wt%; the granularity of the white corundum fine powder is less than 74 mu m.
Al of the calcined alumina micropowder2O3Content (wt.)>99 wt%; the particle size of the calcined alumina micro powder is less than 10 mu m.
The binding agent is SECAR-71 cement and rho-Al2O3One kind of micro powder.
SiO of the silicon micropowder2Content (wt.)>92 wt%; the granularity of the silicon micropowder is less than 1 mu m.
The water reducing agent is FS20 or a mixture of sodium hexametaphosphate and sodium tripolyphosphate; wherein: the mass ratio of the sodium hexametaphosphate to the sodium tripolyphosphate is 1: 0.5-1.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
according to the invention, plate-shaped corundum particles with the particle size of 0.5-1 mm are used as aggregates, uniform pores are generated by particle accumulation, mixed particles with the particle size of 0.125-0.250 mm are added as volume stabilizers, and due to adoption of discontinuous particle accumulation, mutually-through micro pores which are uniformly distributed are more easily generated; the pore size distribution of the material can be adjusted by adjusting the grain composition, the water reducing agent and the adding amount of water, and then micropores which are uniformly distributed and communicated with each other are formed in the fired material. Because the particle size range of the aggregate particles is narrow and the particle size is small, micro air holes with uniform distribution can be formed, compared with a burnout method and machine pressing forming, the preparation method disclosed by the invention is simple and easy to operate, and the prepared dispersion type breathable refractory material is high in strength, easy to adjust, environment-friendly and the like.
The mixed particles adopted by the invention are prepared by mixing kyanite, andalusite and sillimanite, and the particle size of the mixed particles is 0.125-0.250 mm; the kyanite, andalusite and sillimanite have different decomposition temperatures, speeds, mullite grain growth modes and expansion amounts due to the difference of crystal structures. By means of volume expansion and SiO during the mullite-forming process with the aid of volume stabilizers2Silicon powder and Al2O3The mullite generated by the reaction is accompanied by volume expansion, the contraction of the breathable refractory material in the firing process can be counteracted, the volume stabilizer is mixed with three particles, the mullite temperature range is wider, and the firing line change of the dispersive breathable refractory material is reduced. The produced mullite fiber enhances the strength of the material, and micropores which have smaller apertures and more numbers and are uniformly distributed and communicated with each other are formed in the material.
Compared with the technical scheme that the mutually communicated micropores and continuous particle gradation are formed by depending on the pore-forming agent, the dispersion type breathable refractory material prepared by the invention has more uniform micropores; compared with the air brick with single-granularity aggregate, the material has higher strength, can realize better air permeability effect under the condition of low porosity, has uniform distribution of micro pores in the material, and can prepare dispersive air-permeable refractory materials with smaller size and low firing line change rate, such as air-permeable rings, water gap air-permeable elements and the like.
The invention is madeThe obtained dispersion type permeable refractory material is tested: the air permeability is 2-15 mu m2(ii) a The apparent porosity is 20-30%; the bulk density is 2.65-2.95 g/cm3(ii) a The normal temperature compressive strength is 80-160 MPa. The dispersed breathable refractory material prepared by the invention can form uniform bubbles with the diameter of 0.2-2.5 mm through water model experiment verification.
Therefore, the invention has simple process, low cost, high production efficiency and no pollution to the environment, and the prepared dispersion type breathable refractory material has good air permeability, small pore diameter, uniform pore distribution, low firing line change rate, high strength and obvious impurity removal effect.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
In this embodiment:
the granularity of the plate-shaped corundum particles is 0.5-1 mm;
al of kyanite, andalusite and sillimanite in the mixed particles2O3The content is respectively more than 56 wt%; the particle size of the mixed particles is 0.125-0.250 mm;
al of the plate-like corundum particles2O3Content (wt.)>95wt％；
Al of the white corundum fine powder2O3Content (wt.)>99 wt%; the granularity of the white corundum fine powder is less than 74 mu m;
al of the calcined alumina micropowder2O3Content (wt.)>99 wt%; the particle size of the calcined alumina micro powder is less than 10 mu m;
SiO of the silicon micropowder2Content (wt.)>92 wt%; the granularity of the silicon micropowder is less than 1 mu m.
The detailed description is omitted in the embodiments.
Example 1
A dispersive type breathable refractory material and a preparation method thereof. The preparation method in this example is:
the dispersion type breathable refractory material comprises the following raw materials in percentage by weight: 60-66 wt% of tabular corundum particles and 2-7 wt% of mixed particles are used as aggregate, and 16-25 wt% of white corundum fine powder, 8-10 wt% of calcined alumina micro powder, 6-10 wt% of bonding agent and 1-3 wt% of silicon micro powder are used as matrix.
The preparation method of the dispersion type breathable refractory material comprises the following steps: uniformly mixing a water reducing agent accounting for 0.1-0.3 wt% of the raw material with the silicon micropowder to obtain a premix; mixing the premix with the rest of the matrix, and stirring for 3-5 minutes to obtain a premixed matrix material; then mixing the premixed matrix material with the aggregate, stirring for 3-5 minutes, adding 5-10 wt% of water into the raw material, stirring for 3-5 minutes, casting and molding, maintaining at normal temperature for 22-28 hours, and drying at 100-120 ℃ for 22-28 hours; and (3) preserving the heat for 3-4 hours at 1400-1600 ℃ to obtain the dispersion type breathable refractory material.
The mixed particles are: mixing kyanite, andalusite and sillimanite according to the mass ratio of 1: 1-3.5 to obtain the composite material.
The binding agent is SECAR-71 cement.
The water reducing agent is FS 20.
The dispersed permeable refractory material prepared in this example was tested: the air permeability is 2-12 mu m2(ii) a The apparent porosity is 20-24%; the bulk density is 2.8-2.95 g/cm3(ii) a The normal-temperature compressive strength is 95-160 MPa; the firing line change rate is-0.091 to 0.091. The dispersed breathable refractory material prepared by the embodiment can form uniform bubbles with the diameter of 0.2-2.5 mm through water model experiments.
Example 2
A dispersive type breathable refractory material and a preparation method thereof. The procedure of example 1 was repeated, except that the binder and the water-reducing agent were used:
the bonding agent is rho-Al2O3And (5) micro-powder.
The water reducing agent is a mixture of sodium hexametaphosphate and sodium tripolyphosphate; wherein: the mass ratio of the sodium hexametaphosphate to the sodium tripolyphosphate is 1: 0.5-1.
The dispersed permeable refractory material prepared in this example was tested: transparent filmThe gas degree is 2-12 μm2(ii) a The apparent porosity is 20-24%; the volume density is 2.8-2.95 g/cm 3; the normal-temperature compressive strength is 90-160 MPa; the firing line change rate is-0.091 to 0.091. The dispersed breathable refractory material prepared by the embodiment can form uniform bubbles with the diameter of 0.2-2.5 mm through water model experiments.
Example 3
A dispersive type breathable refractory material and a preparation method thereof. The preparation method in this example is:
the dispersion type breathable refractory material comprises the following raw materials in percentage by weight: 63-69 wt% of tabular corundum particles and 3-8 wt% of mixed particles are used as aggregate, and 14-23 wt% of white corundum fine powder, 7-9 wt% of calcined alumina micro powder, 5-9 wt% of bonding agent and 1-3 wt% of silicon micro powder are used as matrix.
The preparation method of the dispersion type breathable refractory material comprises the following steps: uniformly mixing a water reducing agent accounting for 0.1-0.3 wt% of the raw material with the silicon micropowder to obtain a premix; mixing the premix with the rest of the matrix, and stirring for 3-5 minutes to obtain a premixed matrix material; then mixing the premixed matrix material with the aggregate, stirring for 3-5 minutes, adding 5-10 wt% of water into the raw material, stirring for 3-5 minutes, casting and molding, maintaining at normal temperature for 22-28 hours, and drying at 100-120 ℃ for 22-28 hours; and (3) preserving the heat for 3-4 hours at 1400-1600 ℃ to obtain the dispersion type breathable refractory material.
The mixed particles are: mixing kyanite, andalusite and sillimanite according to the mass ratio of 1: 1.5-4 to obtain the kyanite-andalusite-sillimanite composite material.
The binding agent is SECAR-71 cement.
The water reducing agent is FS 20.
The dispersed permeable refractory material prepared in this example was tested: the air permeability is 3-13 mu m2(ii) a The apparent porosity is 22-26%; the volume density is 2.75-2.90 g/cm 3; the normal-temperature compressive strength is 90-155 MPa; the firing line change rate is-0.094 to 0.094. The dispersed breathable refractory material prepared in the embodiment can be formed to be uniform and have a diameter of 0 through water model experiments.2-2.5 mm bubbles.
Example 4
A dispersive type breathable refractory material and a preparation method thereof. The procedure of example 3 was repeated, except that the binder and the water-reducing agent were used:
the bonding agent is rho-Al2O3And (5) micro-powder.
The water reducing agent is a mixture of sodium hexametaphosphate and sodium tripolyphosphate; wherein: the mass ratio of the sodium hexametaphosphate to the sodium tripolyphosphate is 1: 0.5-1.
The dispersed permeable refractory material prepared in this example was tested: the air permeability is 3-13 mu m 2; the apparent porosity is 22-26%; the volume density is 2.75-2.90 g/cm 3; the normal-temperature compressive strength is 85-155 MPa; the firing line change rate is-0.094 to 0.094. The dispersed breathable refractory material prepared by the embodiment can form uniform bubbles with the diameter of 0.2-2.5 mm through water model experiments.
Example 5
A dispersive type breathable refractory material and a preparation method thereof. The preparation method in this example is:
the dispersion type breathable refractory material comprises the following raw materials in percentage by weight: 66-72 wt% of tabular corundum particles and 4-9 wt% of mixed particles are used as aggregate, and 12-21 wt% of white corundum fine powder, 6-8 wt% of calcined alumina micro powder, 4-8 wt% of bonding agent and 1-3 wt% of silicon micro powder are used as matrix.
The preparation method of the dispersion type breathable refractory material comprises the following steps: uniformly mixing a water reducing agent accounting for 0.1-0.3 wt% of the raw material with the silicon micropowder to obtain a premix; mixing the premix with the rest of the matrix, and stirring for 3-5 minutes to obtain a premixed matrix material; then mixing the premixed matrix material with the aggregate, stirring for 3-5 minutes, adding 5-10 wt% of water into the raw material, stirring for 3-5 minutes, casting and molding, maintaining at normal temperature for 22-28 hours, and drying at 100-120 ℃ for 22-28 hours; and (3) preserving the heat for 3-4 hours at 1400-1600 ℃ to obtain the dispersion type breathable refractory material.
The mixed particles are: mixing kyanite, andalusite and sillimanite according to the mass ratio of 1: 2-4.5 to obtain the composite material.
The binding agent is SECAR-71 cement.
The water reducing agent is FS 20.
The dispersed permeable refractory material prepared in this example was tested: the air permeability is 4-14 mu m2(ii) a The apparent porosity is 24-28%; the volume density is 2.70-2.85 g/cm 3; the normal-temperature compressive strength is 85-150 MPa; the firing line change rate is-0.097 to 0.097. The dispersed breathable refractory material prepared by the embodiment can form uniform bubbles with the diameter of 0.2-2.5 mm through water model experiments.
Example 6
A dispersive type breathable refractory material and a preparation method thereof. The procedure of example 5 was repeated, except that the binder and the water-reducing agent were used:
the bonding agent is rho-Al2O3And (5) micro-powder.
The water reducing agent is a mixture of sodium hexametaphosphate and sodium tripolyphosphate; wherein: the mass ratio of the sodium hexametaphosphate to the sodium tripolyphosphate is 1: 0.5-1.
The dispersed permeable refractory material prepared in this example was tested: the air permeability is 4-14 mu m 2; the apparent porosity is 24-28%; the volume density is 2.70-2.85 g/cm 3; the normal-temperature compressive strength is 80-150 MPa; the firing line change rate is-0.097 to 0.097. The dispersed breathable refractory material prepared by the embodiment can form uniform bubbles with the diameter of 0.2-2.5 mm through water model experiments.
Example 7
A dispersive type breathable refractory material and a preparation method thereof. The preparation method in this example is:
the dispersion type breathable refractory material comprises the following raw materials in percentage by weight: 69-75 wt% of tabular corundum particles and 5-10 wt% of mixed particles are used as aggregate, and 10-19 wt% of white corundum fine powder, 5-7 wt% of calcined alumina micro powder, 3-7 wt% of bonding agent and 1-3 wt% of silicon micro powder are used as matrix.
The preparation method of the dispersion type breathable refractory material comprises the following steps: uniformly mixing a water reducing agent accounting for 0.1-0.3 wt% of the raw material with the silicon micropowder to obtain a premix; mixing the premix with the rest of the matrix, and stirring for 3-5 minutes to obtain a premixed matrix material; then mixing the premixed matrix material with the aggregate, stirring for 3-5 minutes, adding 5-10 wt% of water into the raw material, stirring for 3-5 minutes, casting and molding, maintaining at normal temperature for 22-28 hours, and drying at 100-120 ℃ for 22-28 hours; and (3) preserving the heat for 3-4 hours at 1400-1600 ℃ to obtain the dispersion type breathable refractory material.
The mixed particles are: mixing kyanite, andalusite and sillimanite according to the mass ratio of 1: 2.5-5.
The binding agent is SECAR-71 cement.
The water reducing agent is FS 20.
The dispersed permeable refractory material prepared in this example was tested: the air permeability is 5-15 mu m2(ii) a The apparent porosity is 26-30%; the volume density is 2.65-2.80 g/cm 3; the normal-temperature compressive strength is 80-145 MPa; the firing line change rate is-0.1 to 0.1. The dispersed breathable refractory material prepared by the embodiment can form uniform bubbles with the diameter of 0.2-2.5 mm through water model experiments.
Example 8
A dispersive type breathable refractory material and a preparation method thereof. The procedure of example 7 was repeated, except that the binder and the water-reducing agent were used:
the bonding agent is rho-Al2O3And (5) micro-powder.
The water reducing agent is a mixture of sodium hexametaphosphate and sodium tripolyphosphate; wherein: the mass ratio of the sodium hexametaphosphate to the sodium tripolyphosphate is 1: 0.5-1.
The dispersed permeable refractory material prepared in this example was tested: the air permeability is 5-15 mu m2(ii) a The apparent porosity is 26-30%; the volume density is 2.65-2.80 g/cm 3; the normal-temperature compressive strength is 75-145 MPa; the firing line change rate is-0.1 to 0.1. The dispersed breathable refractory material prepared by the embodiment can form uniform bubbles with the diameter of 0.2-2.5 mm through water model experiments.
Compared with the prior art, the specific implementation mode has the following positive effects:
in the specific embodiment, plate-shaped corundum particles with the particle size of 0.5-1 mm are used as aggregates, uniform pores are generated by particle accumulation, mixed particles with the particle size of 0.125-0.250 mm are added as volume stabilizers, and due to the adoption of discontinuous particle accumulation, mutually-through micro pores which are uniformly distributed are more easily generated; the pore size distribution of the material can be adjusted by adjusting the grain composition, the water reducing agent and the adding amount of water, and then micropores which are uniformly distributed and communicated with each other are formed in the fired material. The preparation method has the advantages that the preparation process is simple and easy to operate, and the prepared dispersion type breathable refractory material is high in strength, easy to adjust, environment-friendly and the like.
The mixed particles adopted by the specific embodiment are prepared by mixing kyanite, andalusite and sillimanite, and the particle size of the mixed particles is 0.125-0.250 mm; the kyanite, andalusite and sillimanite have different decomposition temperatures, speeds, mullite grain growth modes and expansion amounts due to the difference of crystal structures. By means of volume expansion and SiO during the mullite-forming process with the aid of volume stabilizers2Silicon powder and Al2O3The mullite generated by the reaction is accompanied by volume expansion, the contraction of the breathable refractory material in the firing process can be counteracted, the volume stabilizer is mixed with three particles, the mullite temperature range is wider, and the firing line change of the dispersive breathable refractory material is reduced. The produced mullite fiber enhances the strength of the material, and micropores which have smaller apertures and more numbers and are uniformly distributed and communicated with each other are formed in the material.
Compared with the technical scheme that the dispersion type breathable refractory material prepared by the specific embodiment forms interpenetrated micropores and continuous grain composition by means of a pore-forming agent, the micropores in the prepared dispersion type breathable refractory material are more uniform; compared with the air brick with single-granularity aggregate, the material has higher strength, can realize better air permeability effect under the condition of low porosity, has uniform distribution of micro pores in the material, and can prepare dispersive air-permeable refractory materials with smaller size and low firing line change rate, such as air-permeable rings, water gap air-permeable elements and the like.
Tests show that the dispersion type breathable refractory material prepared by the embodiment has the following characteristics: the air permeability is 2-15 mu m2(ii) a The apparent porosity is 20-30%; the bulk density is 2.65-2.95 g/cm3(ii) a The normal temperature compressive strength is 80-160 MPa. The dispersed breathable refractory material prepared by the embodiment can form uniform bubbles with the diameter of 0.2-2.5 mm through water model experiments.
Therefore, the method has the advantages of simple process, low cost, high production efficiency and no pollution to the environment, and the prepared dispersion type breathable refractory material has good air permeability, small pore diameter, uniform pore distribution, low firing line change rate, high strength and obvious impurity removal effect.
Claims (8)
1. A preparation method of a dispersion type breathable refractory material is characterized in that the dispersion type breathable refractory material comprises the following raw materials in percentage by weight: taking 60-75 wt% of tabular corundum particles and 2-10 wt% of mixed particles as aggregates, and taking 10-25 wt% of white corundum fine powder, 5-10 wt% of calcined alumina micro powder, 3-10 wt% of binding agent and 1-3 wt% of silicon micro powder as substrates;
the preparation method of the dispersion type breathable refractory material comprises the following steps: uniformly mixing a water reducing agent accounting for 0.1-0.3 wt% of the raw material with the silicon micropowder to obtain a premix; mixing the premix with the rest of the matrix, and stirring for 3-5 minutes to obtain a premixed matrix material; then mixing the premixed matrix material with the aggregate, stirring for 3-5 minutes, adding 5-10 wt% of water into the raw material, stirring for 3-5 minutes, casting and molding, maintaining at normal temperature for 22-28 hours, and drying at 100-120 ℃ for 22-28 hours; preserving heat for 3-4 hours at 1400-1600 ℃ to prepare a dispersion type breathable refractory material;
the granularity of the plate-shaped corundum particles is 0.5-1 mm;
the mixed particles are: according to the mass ratio of 1: 1 (1) of kyanite, andalusite and sillimanite5 to 1 to 5), the kyanite, the andalusite and the sillimanite are mixed to prepare the composite material, and the kyanite, the andalusite and the sillimanite are Al in the mixed particles2O3The content is respectively more than 56 wt%; the particle size of the mixed particles is 0.125-0.250 mm.
2. The method according to claim 1, wherein Al in the plate-like corundum particles is Al2O3Content (wt.)>95wt％。
3. The method of claim 1, wherein the fine white corundum powder is Al2O3Content (wt.)>99 wt%; the granularity of the white corundum fine powder is less than 74 mu m.
4. The method for producing a dispersion-type gas-permeable refractory according to claim 1, wherein the Al of the fine calcined alumina powder is2O3Content (wt.)>99 wt%; the particle size of the calcined alumina micro powder is less than 10 mu m.
5. The method for preparing the dispersive gas-permeable refractory material according to claim 1, wherein the bonding agent is SECAR-71 cement and rho-Al2O3One kind of micro powder.
6. The method for producing a dispersed gas-permeable refractory according to claim 1, wherein the SiO of the fine silica powder is2Content (wt.)>92 wt%; the granularity of the silicon micropowder is less than 1 mu m.
7. The method for preparing the dispersive type air-permeable refractory material according to claim 1, wherein the water reducing agent is FS20 or a mixture of sodium hexametaphosphate and sodium tripolyphosphate; wherein: the mass ratio of the sodium hexametaphosphate to the sodium tripolyphosphate is 1: 0.5-1.
8. A dispersion type breathable refractory material, characterized in that the dispersion type breathable refractory material is prepared by the preparation method of the dispersion type breathable refractory material according to any one of claims 1 to 7.
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| CN108424130A (en) * | 2018-05-23 | 2018-08-21 | 洛阳轩石高温材料有限公司 | The formula three of combined cone disperse air brick |
| CN110526690A (en) * | 2018-05-23 | 2019-12-03 | 洛阳轩石新材料科技有限公司 | A kind of formula of combined cone disperse air brick |
| CN110526691A (en) * | 2018-05-23 | 2019-12-03 | 洛阳轩石新材料科技有限公司 | The formula two of combined cone disperse air brick |
| CN108821755A (en) * | 2018-05-23 | 2018-11-16 | 洛阳轩石新材料科技有限公司 | A kind of formula of combined cone disperse air brick |
| CN114105616B (en) * | 2021-11-30 | 2023-11-14 | 中钢集团洛阳耐火材料研究院有限公司 | Rocket launching platform low-loss protective material |
| CN115819096A (en) * | 2022-12-09 | 2023-03-21 | 山东火天新材料科技有限公司 | Tundish breathable upper nozzle, breathable lining material used for tundish breathable upper nozzle and preparation method of breathable lining material |
| CN116120042A (en) * | 2023-01-19 | 2023-05-16 | 河北国亮新材料股份有限公司 | Method for closely stacking refractory material matrixes and refractory material |
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