CN115231935B - Refractory material for sodium chloride high-salt incineration rotary kiln - Google Patents
Refractory material for sodium chloride high-salt incineration rotary kiln Download PDFInfo
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Abstract
The invention discloses a refractory material for a sodium chloride high-salt rotary kiln, which belongs to the technical field of refractory materials and comprises the following components in parts by weight: 3-5 parts of electric melting chromium oxide, 8-15 parts of desiliconized zirconium oxide powder ultrafine powder and 14-18 parts of Al 2 O 3 ‑SiO 2 The refractory material is added with tantalum powder, has extremely strong corrosion resistance, can effectively resist the acid environment in a sodium chloride burning rotary kiln, and can prolong the service life of the refractory material.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a refractory material for a rotary kiln for burning sodium chloride high-salinity.
Background
The refractory material is an inorganic non-metallic material with refractoriness not lower than 1580 ℃. Refractoriness is the degree centigrade at which a sample of the refractory cone resists high temperatures without softening and melting down without loading. However, the definition of refractoriness alone does not fully describe the refractory material, and 1580 ℃ is not absolute. Materials that are now defined as materials whose physicochemical properties allow them to be used in high temperature environments are referred to as refractory materials. The refractory material is widely used in the industrial fields of metallurgy, chemical industry, petroleum, mechanical manufacturing, silicate, power and the like, and has the largest use amount in the metallurgical industry, accounting for 50-60% of the total output.
The refractory material is applied to various fields of national economy such as steel, nonferrous metals, glass, cement, ceramics, petrifaction, machinery, boilers, light industry, electric power, military industry and the like, is an essential basic material for ensuring the production operation and the technical development of the industries, and plays an irreplaceable important role in the development of high-temperature industrial production.
Since 2001, the refractory industry has kept a good growth situation under the powerful pull of the high-temperature industry such as steel, nonferrous metal, petrochemical, building materials and the like, and has become a world wide refractory production and export country. In 2011, the yield of Chinese refractory materials accounts for about 65 percent of the world, and the yield and the sales volume are stable in the first refractory materials in the world.
The rotary kiln for burning the sodium chloride high-salt not only requires the refractory material on the inner wall to have strong fire resistance, but also requires the refractory material to have strong corrosion resistance due to the acid environment in the rotary kiln, and the sodium chloride high-salt is in friction scouring with the inner wall of the rotary kiln along with the rotation of the rotary kiln, so the refractory material on the market is also required to have wear resistance, the fire resistance of the refractory material can meet the requirements of the rotary kiln for burning the sodium chloride high-salt, but the corrosion resistance and the wear resistance are poor, and the service life of the rotary kiln is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a refractory material for incinerating a sodium chloride high-salinity rotary kiln.
The technical scheme of the invention is as follows: a refractory material for incinerating sodium chloride high-salt rotary kiln comprises the following components in parts by weight: 3-5 parts of electrofused chromium oxide, 8-15 parts of desiliconized zirconia powder ultrafine powder and 14-18 parts of Al 2 O 3 -SiO 2 Ball aggregate, 6-9 parts of composite magnesium hercynite, 15-20 parts of refractory clay, 5-12 parts of composite fiber, 11-20 parts of silicon carbide powder, 7-15 parts of tantalum powder, 9-15 parts of bonding agent and 7-11 parts of additive;
the Al is 2 O 3 -SiO 2 Al in the spherical aggregate with the granularity of 40-50 mu m 2 O 3 -SiO 2 40-50% of the total mass of the spherical aggregate, and Al with the granularity of 50-80 μm 2 O 3 -SiO 2 30-45% of the total mass of the spherical aggregate, and the balance of the particle size is less than or equal to 40 mu m;
the composite fiber comprises the following components in percentage by mass: 10-20% of high-purity aluminum silicate fiber, 15-19% of zirconia fiber, 35-45% of mullite fiber and the balance of alumina fiber;
the composite magnesium hercynite comprises the following components in percentage by mass: 35-45% of sintered magnesia, 7-11% of magnesium hercynite and the balance of fused magnesia.
Furthermore, the length of the high-purity aluminum silicate fiber in the composite fiber is 1-3mm, the diameter of the high-purity aluminum silicate fiber is 0.5-1mm, the length of the zirconia fiber is 2-3mm, the diameter of the zirconia fiber is 0.5-0.8mm, the length of the mullite fiber is 1.5-4mm, the diameter of the mullite fiber is 0.8-1.5mm, the length of the alumina fiber is 2.5-4.5mm, and the diameter of the alumina fiber is 0.4-1.2mm, and different fiber length ratios are matched to increase the wear resistance of the refractory material and prevent the refractory material from falling off at high temperature.
Further, the particle size ratio of the sintered magnesia in the composite magnesia-hercynite is as follows: the particle size of the sintered magnesia is 1-2mm and accounts for 50-60% of the total mass of the sintered magnesia, the particle size of the sintered magnesia is 0.5-1mm and accounts for 20-35% of the total mass of the sintered magnesia, the balance is the sintered magnesia with the particle size of less than or equal to 0.5mm, and the particle size ratio of the magnesia-hercynite is as follows: the granularity of 2-4mm accounts for 30-40% of the total mass of the magnesia-hercynite, the granularity of 1-2mm accounts for 35-42% of the total mass of the magnesia-hercynite, the balance is magnesia-hercynite spinel with the granularity of less than or equal to 1mm, and the granularity ratio of the fused magnesia is as follows: the grain size of 3-4mm accounts for 45-55% of the total mass of the fused magnesia, the grain size of 2-3mm accounts for 15-20% of the total mass of the fused magnesia, and the balance is fused magnesia with the grain size less than or equal to 2mm, and the proportion of different grain sizes is beneficial to enhancing the wear resistance of the refractory material.
Further, al in the refractory clay 2 O 3 The content of SiO accounts for 45-50% of the total mass of the refractory clay 2 The content of Fe is less than 10 percent of the total mass of the refractory clay 2 O 3 The content is less than 3 percent of the total mass of the refractory clay, K 2 O and Na 2 The total content of O is less than 1 percent of the total mass of the refractory clay, the total content of CaO and MgO is less than 0.5 percent of the total mass of the refractory clay, and the refractory clay strengthens the plasticity of the refractory material, thereby facilitating the laying of the refractory material in the rotary kiln.
Further, the binding agent consists of the following components in percentage by mass: 45-65% of modified phenolic resin mixed liquor, 20-35% of industrial phosphoric acid with the concentration of 85% and the balance of aluminum hydroxide powder, and the uniform mixing of all the components is enhanced.
Further, the preparation method of the modified phenolic resin mixed solution comprises the following steps;
s1, preparing modified white carbon black:
activating white carbon black for 5-6 hours at the temperature of 450-500 ℃, adding the white carbon black into an absolute ethyl alcohol solution to prepare 4wt% of white carbon black sol, electromagnetically stirring for 15-20 minutes at the stirring temperature of 60-70 ℃ and at the stirring speed of 120-180r/min, dropwise adding polysorbate-20 in the stirring process, wherein the dropwise adding amount of the polysorbate-20 is 3-5% of the mass of the white carbon black, and stirring to obtain the modified white carbon black;
s2, preparing a modified phenolic resin mixed solution:
mixing phenolic resin and absolute ethyl alcohol according to a mass ratio of 7:5, stirring and mixing, wherein the stirring temperature is 55-60 ℃, the stirring speed is 80-120r/min, the stirring time is 1-1.5h, the modified white carbon black and the deionized water obtained in the step 1 are added after stirring is finished, and the mass ratio of the phenolic resin to the modified white carbon black to the deionized water is 14:1: and 5, continuously stirring for 2-3 hours to obtain a modified phenolic resin mixed solution with good viscosity, so that the components are tightly combined.
Further, the additive is prepared from polyvinyl alcohol, carboxymethyl cellulose, silica sol and aluminum sol in a mass ratio of: 5:3:2:1, is beneficial to the plasticity of the refractory material and promotes the uniform mixing of all the components.
Furthermore, the MgO content in the sintered magnesia is more than or equal to 96 percent, and the Al content in the magnesia-hercynite is more than or equal to 96 percent 2 O 3 The content of the FeO is between 20 and 32 percent, the balance is MgO, and the MgO content in the fused magnesia is more than or equal to 97 percent, which is beneficial to enhancing the fire resistance and the wear resistance of the refractory material.
Further, the Al 2 O 3 -SiO 2 Al in spherical aggregate 2 O 3 80-90wt%, corundum phase 70-80wt%, water absorption 1-3%, and bulk density 3.20-3.5g/cm 3 ，Al 2 O 3 -SiO 2 The ball aggregate has the advantages of precise and controllable particle size distribution and phase composition.
Further, the electrofused chromium oxideMiddle Cr 2 O 3 The content is more than or equal to 98 percent, and the volume density is more than or equal to 5g/cm 3 The apparent porosity is 6 percent, the granularity is 20-30 mu m, the granularity of the desiliconized zirconia powder is 5-15 mu m, and ZrO is added 2 The content of the tantalum powder is more than or equal to 99%, the granularity of the silicon carbide powder is 15-25 mu m, the SiC content is more than or equal to 97%, the granularity of the tantalum powder is 3-8 mu m, the impurity content is less than or equal to 3%, the tantalum powder has extremely high corrosion resistance, and is uniformly distributed in the refractory material, so that the corrosion resistance of the refractory material is improved.
The beneficial effects of the invention are:
compared with the refractory materials on the market, the refractory material has the advantage of strong plasticity, and is convenient for paving the refractory material on the inner wall of the rotary kiln.
Detailed Description
Example 1:
a refractory material for a sodium chloride high-salt incineration rotary kiln comprises the following components in parts by weight: 3 parts of electric melting chromium oxide, 8 parts of desiliconized zirconium oxide powder ultrafine powder and 14 parts of Al 2 O 3 -SiO 2 The composite material comprises 6 parts of ball aggregate, 6 parts of composite magnesium hercynite, 15 parts of refractory clay, 5 parts of composite fiber, 11 parts of silicon carbide powder, 7 parts of tantalum powder, 9 parts of bonding agent and 7 parts of additive;
Al 2 O 3 -SiO 2 al in the spherical aggregate with the granularity of 40-50 mu m 2 O 3 -SiO 2 40 percent of the total mass of the spherical aggregate, and the Al accounts for 50-80 mu m of the granularity 2 O 3 -SiO 2 30 percent of the total mass of the ball aggregate, and the balance of the particle size is less than or equal to 40 mu m;
the composite fiber comprises the following components in percentage by mass: 10% of high-purity alumina silicate fiber, 15% of zirconia fiber, 35% of mullite fiber and the balance of alumina fiber;
the composite magnesium hercynite comprises the following components in percentage by mass: 35% of sintered magnesia, 7% of magnesia-hercynite and the balance of fused magnesia.
The length of the high-purity aluminum silicate fiber in the composite fiber is 1-2mm, the diameter of the high-purity aluminum silicate fiber is 0.5-0.8mm, the length of the zirconia fiber is 2-2.5mm, the diameter of the zirconia fiber is 0.5-0.8mm, the length of the mullite fiber is 1.5-3mm, the diameter of the mullite fiber is 0.8-1mm, the length of the alumina fiber is 2.5-3mm, the diameter of the alumina fiber is 0.4-1mm, and the lengths of the high-purity aluminum silicate fiber and the mullite fiber are matched in proportion to increase the wear resistance of the refractory material and prevent the refractory material from falling off at high temperature.
The granularity ratio of the sintered magnesia in the composite magnesia-hercynite is as follows: the particle size of the sintered magnesia is 1-2mm and 20% of the total mass of the sintered magnesia, the particle size of the sintered magnesia is 0.5-1mm, the balance is the sintered magnesia with the particle size less than or equal to 0.5mm, and the particle size ratio of the magnesia-hercynite is as follows: the particle size of the fused magnesia is 2-4mm accounting for 30% of the total mass of the magnesia-hercynite, the particle size of 1-2mm accounting for 35% of the total mass of the magnesia-hercynite, and the balance is magnesia-hercynite with the particle size less than or equal to 1mm, and the particle size ratio of the fused magnesia is as follows: the grain size of 3-4mm accounts for 45% of the total mass of the fused magnesia, the grain size of 2-3mm accounts for 15% of the total mass of the fused magnesia, and the balance is fused magnesia with the grain size less than or equal to 2mm, and the proportion of different grain sizes is beneficial to enhancing the wear resistance of the refractory material.
Al in refractory clay 2 O 3 The content of SiO accounts for 45 percent of the total mass of the refractory clay 2 The content of Fe is less than 10 percent of the total mass of the refractory clay 2 O 3 The content of K is 2 percent of the total mass of the refractory clay 2 O and Na 2 The total content of O is 1 percent of the total mass of the refractory clay, the total content of CaO and MgO is 0.5 percent of the total mass of the refractory clay, and the refractory clay enhances the plasticity of the refractory material and is convenient for laying the refractory material in the rotary kiln.
The bonding agent comprises the following components in percentage by mass: 45% of modified phenolic resin mixed liquor, 20% of industrial phosphoric acid with the concentration of 85% and the balance of aluminum hydroxide powder, so that the components are uniformly mixed.
The preparation method of the modified phenolic resin mixed solution comprises the following steps;
s1, preparing modified white carbon black:
activating white carbon black for 5 hours at the temperature of 450 ℃, adding the activated white carbon black into an absolute ethyl alcohol solution to prepare 4wt% of white carbon black sol, electromagnetically stirring for 15 minutes at the stirring temperature of 60 ℃ and the stirring speed of 120r/min, dropwise adding polysorbate-20 in the stirring process, wherein the dropwise adding amount of the polysorbate-20 is 3% of the mass of the white carbon black, and stirring to obtain the modified white carbon black;
s2, preparing a modified phenolic resin mixed solution:
mixing phenolic resin with absolute ethyl alcohol according to a mass ratio of 7:5, stirring and mixing, wherein the stirring temperature is 55 ℃, the stirring speed is 80r/min, the stirring time is 1h, the modified white carbon black and the deionized water obtained in the step S1 are added after stirring is finished, and the mass ratio of the phenolic resin to the modified white carbon black to the deionized water is 14:1: and 5, continuously stirring for 2 hours to obtain a modified phenolic resin mixed solution which has good viscosity and enables the components to be tightly combined.
The additive is prepared from polyvinyl alcohol, carboxymethyl cellulose, silica sol and aluminum sol in a mass ratio: 5:3:2:1, is beneficial to the plasticity of the refractory material and promotes the uniform mixing of all the components.
The MgO content in the sintered magnesia is 96.5 percent, and Al in the magnesium hercynite 2 O 3 The content of 55 percent, the content of FeO of 20 percent and the balance of MgO, and the MgO content in the fused magnesia is 97.5 percent, which is beneficial to enhancing the fire resistance and the wear resistance of the refractory material.
Al 2 O 3 -SiO 2 Al in spherical aggregate 2 O 3 80wt% of corundum phase, 70wt% of corundum phase, 1% of water absorption and 3.20g/cm of bulk density 3 ，Al 2 O 3 -SiO 2 The ball aggregate has the advantages of precise and controllable particle size distribution and phase composition.
Cr in electric smelting chromium oxide 2 O 3 The content is 98.5 percent, and the volume density is 5.2g/cm 3 The apparent porosity is 6 percent, the granularity is 20-30 mu m, the granularity of the desiliconized zirconia powder ultrafine powder is 5-15 mu m, zrO 2 99 percent of the content, the granularity of the silicon carbide powder is 15 to 25 mu m, the SiC content is 97 percent, the granularity of the tantalum powder is 3 to 8 mu m, and the impurity content is 3 percentThe tantalum powder has extremely high corrosion resistance, and is uniformly distributed in the refractory material, so that the corrosion resistance of the refractory material is improved.
Example 2:
a refractory material for a sodium chloride high-salt incineration rotary kiln comprises the following components in parts by weight: 4 parts of electric melting chromium oxide, 10 parts of desiliconized zirconium oxide powder ultrafine powder and 16 parts of Al 2 O 3 -SiO 2 The composite material comprises 8 parts of ball aggregate, 8 parts of composite magnesia-hercynite, 18 parts of refractory clay, 9 parts of composite fiber, 18 parts of silicon carbide powder, 10 parts of tantalum powder, 13 parts of bonding agent and 9 parts of additive;
Al 2 O 3 -SiO 2 al in the spherical aggregate with the granularity of 40-50 mu m 2 O 3 -SiO 2 45 percent of the total mass of the spherical aggregate, and the Al accounts for 50-80 mu m of the granularity 2 O 3 -SiO 2 35 percent of the total mass of the spherical aggregate, and the balance of the particle size is less than or equal to 40 mu m;
the composite fiber comprises the following components in percentage by mass: 15% of high-purity alumina silicate fiber, 18% of zirconia fiber, 40% of mullite fiber and the balance of alumina fiber;
the composite magnesium hercynite comprises the following components in percentage by mass: 40% of sintered magnesia, 9% of magnesia-hercynite and the balance of fused magnesia.
The length of the high-purity aluminum silicate fiber in the composite fiber is 1-3mm, the diameter of the high-purity aluminum silicate fiber is 0.5-1mm, the length of the zirconia fiber is 2-3mm, the diameter of the zirconia fiber is 0.5-0.8mm, the length of the mullite fiber is 1.5-4mm, the diameter of the mullite fiber is 0.8-1.5mm, the length of the alumina fiber is 2.5-4.5mm, and the diameter of the alumina fiber is 0.4-1.2mm, and different fiber length ratios are matched to increase the wear resistance of the refractory material and prevent the refractory material from falling off at high temperature.
The granularity ratio of the sintered magnesia in the composite magnesia-hercynite is as follows: the particle size of the sintered magnesia-alumina spinel is 1-2mm accounting for 55% of the total mass of the sintered magnesia, the particle size of the sintered magnesia is 0.5-1mm accounting for 30% of the total mass of the sintered magnesia, the balance is the sintered magnesia with the particle size less than or equal to 0.5mm, and the particle size ratio of the magnesia-alumina spinel is as follows: the particle size of the fused magnesia is 2-4mm accounting for 35% of the total mass of the magnesia-hercynite, the particle size of 1-2mm accounting for 40% of the total mass of the magnesia-hercynite, and the balance is magnesia-hercynite with the particle size less than or equal to 1mm, and the particle size ratio of the fused magnesia is as follows: the fused magnesia with the granularity of 3-4mm accounts for 50 percent of the total mass of the fused magnesia, the granularity of 2-3mm accounts for 18 percent of the total mass of the fused magnesia, and the balance is the fused magnesia with the granularity less than or equal to 2mm, and the proportion of different granularities is beneficial to enhancing the wear resistance of the refractory material.
Al in refractory clay 2 O 3 The content of SiO accounts for 48 percent of the total mass of the refractory clay 2 The content of Fe accounts for 9 percent of the total mass of the refractory clay 2 O 3 Content of 2% of the total mass of the refractory clay, K 2 O and Na 2 The total content of O is 0.5 percent of the total mass of the refractory clay, the total content of CaO and MgO is 0.3 percent of the total mass of the refractory clay, and the refractory clay enhances the plasticity of the refractory material and facilitates the laying of the refractory material in the rotary kiln.
The bonding agent comprises the following components in percentage by mass: 55 percent of modified phenolic resin mixed solution, 30 percent of industrial phosphoric acid with the concentration of 85 percent and the balance of aluminum hydroxide powder, thereby enhancing the uniform mixing among the components.
The preparation method of the modified phenolic resin mixed solution comprises the following steps;
s1, preparing modified white carbon black:
activating white carbon black for 5.5 hours at 480 ℃, then adding the white carbon black into an absolute ethyl alcohol solution to prepare 4wt% white carbon black sol, electromagnetically stirring for 18 minutes at the stirring temperature of 65 ℃ and the stirring speed of 150r/min, dropwise adding polysorbate-20 in the stirring process, wherein the dropwise adding amount of the polysorbate-20 is 4% of the mass of the white carbon black, and stirring to obtain the modified white carbon black;
s2, preparing a modified phenolic resin mixed solution:
mixing phenolic resin with absolute ethyl alcohol according to a mass ratio of 7: and 5, stirring and mixing, wherein the stirring temperature is 58 ℃, the stirring speed is 100r/min, the stirring time is 1.3h, the modified white carbon black and the deionized water obtained in the step 1 are added after stirring is finished, and the mass ratio of the phenolic resin to the modified white carbon black to the deionized water is 14:1: and 5, continuously stirring for 2.5 hours to obtain a modified phenolic resin mixed solution which has good viscosity and enables the components to be tightly combined.
The additive is prepared from polyvinyl alcohol, carboxymethyl cellulose, silica sol and aluminum sol in a mass ratio of: 5:3:2:1, is beneficial to the plasticity of the refractory material and promotes the uniform mixing of all the components.
The MgO content in the sintered magnesia is 96 percent, and the Al content in the magnesia-hercynite 2 O 3 The content of 60 percent, the content of FeO is 25 percent, the balance is MgO, and the content of MgO in the fused magnesia is 97 percent, which is beneficial to enhancing the fire resistance and the wear resistance of the refractory material.
Al 2 O 3 -SiO 2 Al in spherical aggregate 2 O 3 85wt%, corundum phase 75wt%, water absorption 2%, and bulk density 3.4g/cm 3 ，Al 2 O 3 -SiO 2 The ball aggregate has the advantages of precise and controllable particle size distribution and phase composition.
Cr in electric smelting chromium oxide 2 O 3 The content is 98.5 percent, and the volume density is 5g/cm 3 The apparent porosity is 6 percent, the granularity is 20-30 mu m, the granularity of the desiliconized zirconia powder is 5-15 mu m, zrO is added 2 The content is 99.3%, the granularity of the silicon carbide powder is 15-25 mu m, the SiC content is 97.5%, the granularity of the tantalum powder is 3-8 mu m, the impurity content is 2%, and the tantalum powder has extremely strong corrosion resistance and is uniformly distributed in the refractory material, so that the corrosion resistance of the refractory material is improved.
Example 3:
a refractory material for a sodium chloride high-salt incineration rotary kiln comprises the following components in parts by weight: 5 parts of fused chromium oxide, 15 parts of desiliconized zirconia powder ultrafine powder and 18 parts of Al 2 O 3 -SiO 2 The composite material comprises 9 parts of ball aggregate, 9 parts of composite magnesium hercynite, 20 parts of refractory clay, 12 parts of composite fiber, 20 parts of silicon carbide powder, 15 parts of tantalum powder, 15 parts of bonding agent and 11 parts of additive;
Al 2 O 3 -SiO 2 al in the spherical aggregate with the granularity of 40-50 mu m 2 O 3 -SiO 2 50 percent of the total mass of the spherical aggregate, and the Al accounts for 50 to 80 mu m of the granularity 2 O 3 -SiO 2 45 percent of the total mass of the spherical aggregate, and the balance of the particle size is less than or equal to 40 mu m;
the composite fiber comprises the following components in percentage by mass: 20% of high-purity alumina silicate fiber, 19% of zirconia fiber, 45% of mullite fiber and the balance of alumina fiber;
the composite magnesium hercynite comprises the following components in percentage by mass: 45% of sintered magnesia, 11% of magnesia-hercynite and the balance of fused magnesia.
The length of the high-purity aluminum silicate fiber in the composite fiber is 1-3mm, the diameter of the high-purity aluminum silicate fiber is 0.5-1mm, the length of the zirconia fiber is 2-3mm, the diameter of the zirconia fiber is 0.5-0.8mm, the length of the mullite fiber is 1.5-4mm, the diameter of the mullite fiber is 0.8-1.5mm, the length of the alumina fiber is 2.5-4.5mm, and the diameter of the alumina fiber is 0.4-1.2mm, and different fiber length ratios are matched to increase the wear resistance of the refractory material and prevent the refractory material from falling off at high temperature.
The granularity ratio of the sintered magnesia in the composite magnesia-hercynite is as follows: the particle size of the sintered magnesia is 1-2mm and 35% of the total mass of the sintered magnesia, the particle size of the sintered magnesia is 0.5-1mm, the balance is the sintered magnesia with the particle size less than or equal to 0.5mm, and the particle size ratio of the magnesia-hercynite is as follows: the particle size of 2-4mm accounts for 40% of the total mass of the magnesia-hercynite, the particle size of 1-2mm accounts for 42% of the total mass of the magnesia-hercynite, the balance is magnesia-hercynite with the particle size less than or equal to 1mm, and the particle size ratio of the fused magnesia is as follows: the granularity of 3-4mm accounts for 55 percent of the total mass of the fused magnesia, the granularity of 2-3mm accounts for 20 percent of the total mass of the fused magnesia, and the balance is the fused magnesia with the granularity less than or equal to 2mm, and the mixture ratio of different granularities is beneficial to enhancing the wear resistance of the refractory material.
Al in refractory clay 2 O 3 The content of SiO is 50 percent of the total mass of the refractory clay 2 The content of Fe is 4 percent of the total mass of the refractory clay 2 O 3 The content of K is 1 percent of the total mass of the refractory clay 2 O and Na 2 The total content of O is 0.3 percent of the total mass of the refractory clay, the total content of CaO and MgO is 0.1 percent of the total mass of the refractory clay, and the refractory clay strengthens the plasticity of the refractory material and is convenient for laying the refractory material in the rotary kiln.
The bonding agent comprises the following components in percentage by mass: 65% of modified phenolic resin mixed solution, 35% of industrial phosphoric acid with the concentration of 85% and the balance of aluminum hydroxide powder, so that the uniform mixing among the components is enhanced.
The preparation method of the modified phenolic resin mixed solution comprises the following steps;
s1, preparing modified white carbon black:
activating the white carbon black for 6 hours at 500 ℃, adding the white carbon black into an absolute ethyl alcohol solution to prepare 4wt% white carbon black sol, electromagnetically stirring for 20 minutes at the stirring temperature of 70 ℃ and at the stirring speed of 180r/min, dropwise adding polysorbate-20 during stirring, wherein the dropwise adding amount of the polysorbate-20 is 5% of the mass of the white carbon black, and stirring to obtain the modified white carbon black;
s2, preparing a modified phenolic resin mixed solution:
mixing phenolic resin and absolute ethyl alcohol according to a mass ratio of 7: and 5, stirring and mixing, wherein the stirring temperature is 60 ℃, the stirring speed is 120r/min, the stirring time is 1.5h, the modified white carbon black and the deionized water obtained in the step 1 are added after stirring is finished, and the mass ratio of the phenolic resin to the modified white carbon black to the deionized water is 14:1: and 5, continuously stirring for 3 hours to obtain a modified phenolic resin mixed solution which has good viscosity and enables the components to be tightly combined.
The additive is prepared from polyvinyl alcohol, carboxymethyl cellulose, silica sol and aluminum sol in a mass ratio: 5:3:2:1, is beneficial to the plasticity of the refractory material and promotes the uniform mixing of all the components.
The MgO content in the sintered magnesia is 97 percent, and the Al content in the magnesia-hercynite 2 O 3 65 percent of FeO, 32 percent of FeO and the balance of MgO, and the MgO content in the fused magnesia is 98 percent, which is beneficial to enhancing the fire resistance and the wear resistance of the refractory material.
Al 2 O 3 -SiO 2 Al in spherical aggregate 2 O 3 The content is 90wt%, the content of corundum phase is 80wt%, the water absorption is 3%, and the volume density is 3.5g/cm 3 ，Al 2 O 3 -SiO 2 The ball aggregate has the advantages of precise and controllable particle size distribution and phase composition.
Cr in electric smelting chromium oxide 2 O 3 The content is 98.9 percent, and the volume density is 5.5g/cm 3 The apparent porosity is 6 percent, the granularity is 20-30 mu m, the granularity of the desiliconized zirconia powder ultrafine powder is 5-15 mu m, zrO 2 99.8 percent of the SiC, the granularity of the silicon carbide powder is 15 to 25 mu m, and the SiC contentThe content of the impurities is 1%, the granularity of the tantalum powder is 98%, the granularity of the tantalum powder is 3-8 mu m, and the tantalum powder has extremely strong corrosion resistance and is uniformly distributed in the refractory material, so that the corrosion resistance of the refractory material is improved.
Comparative examples 1 to 3, the refractory of example 3 is superior to examples 1 and 2 in corrosion resistance, impact strength, fire resistance and abrasion resistance, and thus example 3 is the most preferable example.
Claims (10)
1. The refractory material for incinerating the sodium chloride high-salt rotary kiln is characterized by comprising the following components in parts by weight: 3-5 parts of electric melting chromium oxide, 8-15 parts of desiliconized zirconium oxide powder ultrafine powder and 14-18 parts of Al 2 O 3 -SiO 2 Ball aggregate, 6-9 parts of composite magnesium hercynite, 15-20 parts of refractory clay, 5-12 parts of composite fiber, 11-20 parts of silicon carbide powder, 7-15 parts of tantalum powder, 9-15 parts of bonding agent and 7-11 parts of additive;
the Al is 2 O 3 -SiO 2 Al in the spherical aggregate with the granularity of 40-50 mu m 2 O 3 -SiO 2 40-50% of the total mass of the spherical aggregate, and Al accounting for 50-80 μm of the granularity 2 O 3 -SiO 2 30-45% of the total mass of the spherical aggregate, and the balance of the particle size is less than or equal to 40 mu m;
the composite fiber comprises the following components in percentage by mass: 10-20% of high-purity alumina silicate fiber, 15-19% of zirconia fiber, 35-45% of mullite fiber and the balance of alumina fiber;
the composite magnesium hercynite comprises the following components in percentage by mass: 35-45% of sintered magnesia, 7-11% of magnesium hercynite and the balance of fused magnesia.
2. The refractory for incinerating sodium chloride high-salt rotary kiln as claimed in claim 1, wherein the high-purity alumina silicate fiber in the composite fiber has a length of 1 to 3mm, a diameter of 0.5 to 1mm, a length of 2 to 3mm, a diameter of 0.5 to 0.8mm, a length of 1.5 to 4mm, a diameter of 0.8 to 1.5mm, and a length of 2.5 to 4.5mm and a diameter of 0.4 to 1.2mm.
3. The refractory material for incinerating sodium chloride high-salt rotary kiln as claimed in claim 1, wherein the particle size ratio of the sintered magnesia in the composite magnesia-hercynite is as follows: the particle size of the sintered magnesia is 1-2mm and accounts for 50-60% of the total mass of the sintered magnesia, the particle size of the sintered magnesia is 0.5-1mm and accounts for 20-35% of the total mass of the sintered magnesia, the balance is the sintered magnesia with the particle size of less than or equal to 0.5mm, and the particle size ratio of the magnesia-hercynite is as follows: the particle size of the fused magnesia is 2-4mm accounting for 30-40% of the total mass of the magnesia-hercynite, the particle size of the fused magnesia is 1-2mm accounting for 35-42% of the total mass of the magnesia-hercynite, the balance is magnesia-hercynite spinel with the particle size of less than or equal to 1mm, and the particle size ratio of the fused magnesia is as follows: the fused magnesia with the granularity of 3-4mm accounts for 45-55% of the total mass of the fused magnesia, the fused magnesia with the granularity of 2-3mm accounts for 15-20% of the total mass of the fused magnesia, and the balance is fused magnesia with the granularity of less than or equal to 2mm.
4. The refractory material for incinerating sodium chloride high-salt rotary kiln as claimed in claim 1, wherein said refractory clay contains Al 2 O 3 The content of SiO accounts for 45-50% of the total mass of the refractory clay 2 The content of Fe is less than 10 percent of the total mass of the refractory clay 2 O 3 The content is less than 3 percent of the total mass of the refractory clay, K 2 O and Na 2 The total content of O is less than 1% of the total mass of the fire clay, and the total content of CaO and MgO is less than 0.5% of the total mass of the fire clay.
5. The refractory material for incinerating sodium chloride high-salt rotary kiln as claimed in claim 1, wherein the binder comprises the following components by mass percent: 45-65% of modified phenolic resin mixed liquor, 20-35% of industrial phosphoric acid with the concentration of 85% and the balance of aluminum hydroxide powder.
6. The refractory material for incinerating sodium chloride high-salt rotary kiln according to claim 5, wherein the preparation method of the modified phenolic resin mixed solution comprises the following steps;
s1, preparing modified white carbon black:
activating the white carbon black for 5-6 hours at the temperature of 450-500 ℃, adding the white carbon black into an absolute ethyl alcohol solution to prepare 4wt% white carbon black sol, electromagnetically stirring for 15-20 minutes at the stirring temperature of 60-70 ℃ and at the stirring speed of 120-180r/min, dropwise adding polysorbate-20 in the stirring process, wherein the dropwise adding amount of the polysorbate-20 is 3-5% of the mass of the white carbon black, and stirring to obtain the modified white carbon black;
s2, preparing a modified phenolic resin mixed solution:
mixing phenolic resin and absolute ethyl alcohol according to a mass ratio of 7:5, stirring and mixing, wherein the stirring temperature is 55-60 ℃, the stirring speed is 80-120r/min, the stirring time is 1-1.5h, the modified white carbon black and the deionized water obtained in the step S1 are added after stirring is finished, and the mass ratio of the phenolic resin to the modified white carbon black to the deionized water is 14:1: and 5, continuously stirring for 2-3h to obtain a modified phenolic resin mixed solution.
7. The refractory material for incinerating sodium chloride high-salt rotary kiln as claimed in claim 1, wherein the additive is prepared from polyvinyl alcohol, carboxymethyl cellulose, silica sol and aluminium sol by mass ratio: 5:3:2:1, and preparing the composition.
8. The refractory material for incinerating sodium chloride high-salt rotary kiln as claimed in claim 1, wherein the content of MgO in the sintered magnesia is not less than 96%, and Al in the magnesia-hercynite 2 O 3 The content is 55-65%, the FeO content is 20-32%, the balance is MgO, and the MgO content in the fused magnesia is more than or equal to 97%.
9. The refractory for incinerating sodium chloride high-salt rotary kiln as set forth in claim 1, wherein said Al is 2 O 3 -SiO 2 Al in spherical aggregate 2 O 3 80-90wt%, corundum phase 70-80wt%, water absorption 1-3%, and bulk density 3.20-3.5g/cm 3 。
10. The refractory of claim 1, wherein the electrofused chromium oxide comprises Cr 2 O 3 The content is more than or equal to 98 percent, and the volume density is more than or equal to5g/cm 3 The apparent porosity is 6 percent, the granularity is 20-30 mu m, the granularity of the desiliconized zirconia powder is 5-15 mu m, and ZrO is added 2 The content is more than or equal to 99 percent, the granularity of the silicon carbide powder is 15-25 mu m, the SiC content is more than or equal to 97 percent, the granularity of the tantalum powder is 3-8 mu m, and the impurity content is less than or equal to 3 percent.
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