CN114180977B - Phosphorus-free plastic material for casting and preparation method thereof - Google Patents
Phosphorus-free plastic material for casting and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of cast steel and cast iron smelting, and particularly relates to a phosphorus-free plastic material for casting and a preparation method thereof. The technical points are as follows: the material comprises the following chemical components in percentage by mass: al (Al) 2 O 3 ：78%~88%、SiO 2 ：6%~10%、ZrO 2 : 2% -4% and C: 2% -3%. The invention provides a phosphorus-free plastic material for casting and a preparation method thereof, which solve the problem that phosphorus-containing plastic materials in the current market harm and pollute molten iron and molten steel in the using process; meanwhile, the problems that a construction blank body of the plastic material combined by other binding agents is low in strength, easy to crack in use, short in storage life and the like in the use process are solved, and the plastic material has the advantages of excellent construction, long storage life, good high-temperature strength and the like.
Description
Technical Field
The invention belongs to the technical field of cast steel and cast iron smelting, and particularly relates to a phosphorus-free plastic material for casting and a preparation method thereof.
Background
Compared with other unshaped refractories, the plastic material has the advantages of good thermal shock resistance, strong spalling resistance, excellent corrosion resistance, high-temperature strength, low heat conductivity coefficient, flexible construction mode and the like. The method is widely applied to the field of metal smelting.
The plastic material in the current market can be divided into phosphoric acid plastic material, phosphate plastic material, water glass plastic material and the like according to the type of the bonding agent. The plastic material combined by phosphoric acid and phosphate has higher strength index, but the content of ferric oxide in the raw material for the plastic material is higher, and the phosphoric acid and the phosphate are easy to generate chemistry with the ferric oxide, so that the storage period of the plastic material is greatly shortened.
Meanwhile, phosphorus is a very harmful element in steel, and the low-temperature toughness of the steel is reduced due to the existence of the phosphorus, so that the brittleness of the steel is improved; at high temperatures, the presence of phosphorus also affects the plasticity of the steel. However, if the water glass binder is used to replace phosphoric acid and phosphate, a hard shell will be formed on the surface of the material during the baking process, which reduces the strength of the plastic body and affects the storage life of the plastic.
In view of the defects of the existing plastic material for casting, the inventor develops a phosphorus-free plastic material for casting and a preparation method thereof based on years of abundant experience and professional knowledge of the materials, and together with theoretical analysis and research and innovation, and the phosphorus-free plastic material has excellent construction performance, storage life and high-temperature strength.
Disclosure of Invention
The invention aims to provide a phosphorus-free plastic material for casting and a preparation method thereof, which solve the problem that phosphorus-containing plastic materials in the current market harm and pollute molten iron and molten steel in the using process; meanwhile, the problems that a construction blank body of the plastic material combined by other binding agents is low in strength, easy to crack in use, short in storage life and the like in the use process are solved, and the plastic material has the advantages of excellent construction, long storage life, good high-temperature strength and the like.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a phosphorus-free plastic material for casting, which comprises the following chemical components in percentage by mass: al (aluminum) 2 O 3 ：78％～88％、SiO 2 ：6％～10％、ZrO 2 : 2% -4% and C: 2 to 3 percent. The phosphorus-free plastic material can be used for working linings of ladles and steel ladles, and can also be used for repairing the worn parts of the furnace linings of coreless induction furnaces for melting molten steel, high-temperature molten iron and various nonferrous alloys and furnace mouth materials.
Further, the phosphorus-free plastic material for casting provided by the invention comprises the following components in percentage by weight: calcined tabular corundum 60-70%, alpha-Al 2 O 3 8 to 12 percent of fused cast zirconia-corundum micropowder, 4 to 7 percent of fused cast zirconia-corundum micropowder, 4 to 5.5 percent of aluminum sulfate powder and sodium silicate powder, 2 to 3 percent of metallurgical coke powder, 2 to 3 percent of silicon micropowder and 1 to 1.5 percent of aluminum powder.
Further, the sodium silicate powder is added in the following amount according to the mass percentage
Wherein, w is the mass percentage of the sodium silicate powder;
W 1 is alpha-Al 2 O 3 A is alpha-Al 2 O 3 Middle Al 2 O 3 The mass percentage of (A);
W 2 is the mass percentage of the fused cast zirconia-corundum micro powder,b is Al in fused cast zirconia-corundum micropowder 2 O 3 The mass percentage of (A);
p is the modulus of sodium silicate.
The effect of sodium silicate powder on the sintering of refractory materials is mainly in liquid phase sintering, during which the sodium silicate powder can change the properties of the liquid phase (such as viscosity, composition, etc.), thereby promoting sintering. When the sodium silicate powder and corundum in the system form a solid solution at high temperature, lattice defects are increased, and lattices are activated, so that sintering is promoted, the bulk density of the material is improved, the apparent porosity of the material is reduced, and the breaking resistance and compressive strength of the material are improved. The sodium silicate powder has low melting point and is easy to be mixed with other micro powder (alpha-Al) in the system 2 O 3 Micropowder, fused cast zirconia-corundum micropowder) forms a multi-component low eutectic at high temperature, and because the liquid phase mass transfer resistance is small and the mass transfer speed is high, the sintering temperature is reduced, and the material density is improved; however, the addition of excessive sodium silicate powder can cause crystal transformation and large volume effect of the fused cast zirconia-corundum micro powder in the system in the sintering process, sintering densification is difficult to realize, and cracking of the material is easily caused.
In the invention, alpha-Al in the integral component is adopted 2 O 3 The adding amount of the sodium silicate powder is limited, so that the strength of the material can be improved by adding the sodium silicate, and excessive alpha-Al is avoided 2 O 3 The presence of high temperature reacting sodium silicate affects the high temperature strength of the material.
Further, the sodium silicate powder is added in the following amount according to the mass percentage
Wherein T is 1 Is 1200 ℃, T 2 The highest temperature of heating during casting is measured in units of; t is 2 ＞T 1 . The melting point of the sodium silicate powder is 1088 ℃, the low melting point can reduce the high-temperature strength and the high-temperature soft-loaded characteristic of the plastic material at high temperature, and the existence of the sodium silicate can promote the m-ZrO in the fused zirconia corundum at about 1200 DEG C 2 Conversion to t-ZrO 2 And the volume shrinkage is about 10 percent, so that the material is obtainedThe material density is greatly reduced, the apparent porosity is greatly improved, and the folding strength and the compressive strength are greatly reduced, so that the stability of the product is reduced.
Further, the aluminum sulfate powder is added in the following amount according to the mass percentage
Wherein c is Na in the sodium silicate 2 The mass percent of O;
d is SiO in sodium silicate 2 In mass percent.
Aluminum sulfate has very excellent moisture-retaining property, the storage life can be prolonged when the aluminum sulfate is used in plastic materials, but the excessive aluminum sulfate influences the strength index of the plastic; therefore, when the adding amount of the sodium silicate powder is appropriate, the defect of insufficient strength index caused by the addition of the aluminum sulfate can be overcome, but when the strength improvement caused by the sodium silicate powder is not enough to meet the strength index defect caused by the addition of the aluminum sulfate, the adding amount of the aluminum sulfate needs to be reduced. The invention limits the adding amount of aluminum sulfate by adopting the adding amount of sodium silicate, and can ensure the storage life of the plastic material and the strength index of the plastic material at the same time. The strength improvement brought by sodium silicate is mainly Na in sodium silicate 2 O plays a role, so Na is used 2 The content of O is used to limit the addition amount of the aluminum sulfate powder.
Further, alpha-Al 2 O 3 The content of aluminum oxide in the micro powder is more than 99.7 percent, the content of sodium oxide is less than 0.10 percent, and the particle size is 1.8-2.5 mu m.
The sodium content in the alumina micro powder can form a low-melting-point substance with other raw materials at high temperature, the refractoriness of the refractory material is reduced, the material is easy to crack, and the thermal shock stability and the high-temperature strength of the material are reduced 2 O 3 The micro powder has small particle size, thereby having excellent specific surface area and sintering activity, and being easy to be mixed in a system at high temperatureSiO of (2) 2 The reaction generates rod-shaped or needle-shaped mullite substances, and the mullite not only has excellent high-temperature volume stability, but also can densify the material, reduce the porosity of the material and improve the volume stability and the high-temperature strength of the material.
Further, ZrO in fused cast zirconia corundum micropowder 2 Content is not less than 31.5%, Al 2 O 3 The content is more than or equal to 46.5 percent, SiO 2 Less than or equal to 20.0 percent and the grain diameter is less than or equal to 0.075 mm.
The fused zirconia corundum adopted by the invention is fused zirconia corundum micro powder micronized by a high-energy ball mill, has high surface energy and can promote low-temperature sintering, in addition, the fused zirconia corundum micro powder contains a glass phase, and a liquid phase appearing at high temperature generates larger capillary force to cause particle sliding, so that the sintering is changed into a sintering process of mass transfer and particle sliding with participation of the liquid phase instead of solid phase sintering, so that the apparent porosity of the material is reduced, the relative density of the material is improved, the excellent medium-high temperature strength of the plastic material is ensured, and the fused zirconia corundum micro powder and the sodium silicate powder adopted in the invention generate synergistic effect, further promote liquid-phase mass transfer, and improve the medium-high temperature strength of the plastic material; meanwhile, the zirconia has excellent chemical erosion resistance, and the introduction of the fused cast zirconia corundum micropowder greatly improves the erosion resistance of the phosphorus-free plastic material.
Further, SiO in sodium silicate powder 2 65.0% of Na 2 The O content was 34.5%, and the modulus was 2.10.
Further, calcining of plate-like corundum Al 2 O 3 The content is more than or equal to 99.5 percent, and the grain diameter is 0.045 mm-6 mm.
The plate-shaped corundum is a sintered corundum which is completely sintered and shrunk without adding any additive and has large and large crystals and good development 2 O 3 The sheet-shaped crystal structure has small and more closed pores, the porosity is almost equal to that of the electro-fused corundum, the purity is high, the volume stability is good, the re-sintering shrinkage is very small, and the sheet-shaped crystal structure is used in refractory materials and has good thermal shock stability and breaking and pressure resistance strength at high temperature. The phosphorus-free plastic material taking high-purity calcined corundum as a main raw material has excellent bending resistance and compressive strength at high temperatureExcellent cold and hot impact resistance.
Further, the silicon content in the silicon micro powder is more than 97 percent; the Al content in the aluminum powder is more than or equal to 99.7 percent. The particle size is 0-0.075 mm.
The metallurgical coke powder and the silicon micro powder provided by the invention react in situ to generate the dumbbell-shaped silicon carbide crystal whisker with high thermal conductivity, so that the thermal conductivity of the phosphorus-free plastic material is improved, and the volume density, compressive strength and thermal conductivity of the phosphorus-free plastic material are increased along with the generation of the silicon carbide crystal whisker.
In the invention, the introduction of the aluminum powder can not only reduce the oxidation degree of the coke powder and ensure the formation of a large amount of silicon carbide whiskers, but also form Al with oxygen in an oxidizing atmosphere 2 O 3 The material is filled into pores of the plastic material, so that the material is more compact, has more excellent cold and heat shock resistance and has excellent high-temperature strength.
The second purpose of the invention is to provide a preparation method of the phosphorus-free plastic material for casting, which has the same effect.
The invention provides a preparation method of phosphorus-free plastic material for casting, which comprises the following operation steps:
s1, preparing calcined tabular corundum, alpha-Al 2 O 3 Micro powder, fused cast zirconia corundum micro powder, aluminum sulfate powder, sodium silicate powder, metallurgical coke powder, silicon micro powder and aluminum powder;
s2, mixing the calcined tabular corundum with alpha-Al 2 O 3 Adding the micro powder, the fused cast zirconia-corundum micro powder, the aluminum sulfate powder, the metallurgical coke powder, the silicon micro powder and the aluminum powder into a mixer for premixing;
s3, putting the premixed material in the step S2 and sodium silicate powder into a planetary mixer for mixing;
s4, when the raw materials are agglomerated and are not uniformly mixed in the step S3, the raw materials need to be mixed again, after all the raw materials are uniformly mixed, water is added into the mixture, and the mixture is continuously mixed.
In conclusion, the invention has the following beneficial effects:
1. the invention solves the problems of short storage life and low medium-high temperature strength commonly existing in the conventional phosphorus-free plastic material in the current market by mixing aluminum sulfate powder, sodium silicate powder and other micro-powders in different proportions. The aluminum sulfate has very good moisture retention in the plastic, can prolong the storage life of the plastic, but has poor high-temperature strength; the sodium silicate powder can obviously enhance the medium-high temperature strength of the plastic material, but too much introduction can cause the storage life of the plastic material to be shortened and high-temperature shrinkage cracking to occur, so the addition amount of the proper aluminum sulfate and sodium silicate powder is particularly critical.
2. The plastic material provided by the invention fundamentally avoids pollution and damage to cast iron cast steel caused by the introduction of phosphorus in the raw materials by selecting proper refractory raw materials, and the selected high-purity calcined tabular corundum and high-purity low-sodium alpha-Al 2 O 3 The raw materials of the micro powder, the fused cast zirconia-corundum micro powder and the like are phosphorus-free refractory raw materials. Through detection, P in the phosphorus-free plastic material is P 2 O 5 The content is 0.0053 percent, is far lower than similar products in the market, and meets the requirements of customers on phosphorus-free plastic (P in the phosphorus-free plastic) 2 O 5 The content is less than or equal to 0.0085 percent).
3. In the present invention, high purity and low sodium alpha-Al 2 O 3 The introduction of the micro powder, the fused cast zirconia corundum micro powder, the metallurgical coke powder and the silicon micro powder enables the phosphorus-free plastic material to generate a rod-shaped or needle-shaped mullite substance at medium and high temperature, the mullite not only has excellent high-temperature volume stability, but also can enable the material to be densified, meanwhile, the metallurgical coke powder and the silicon micro powder can react to generate dumbbell-shaped silicon carbide whiskers, the heat-conducting property of the phosphorus-free plastic material is improved, the volume density, the compressive strength and the heat-conducting coefficient of the phosphorus-free plastic material are also improved, the air tightness and the erosion resistance of molten metal or molten slag of the material are enhanced, the service life and the operation rate of working equipment are prolonged, and the labor intensity of field workers is reduced.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the detailed description of the embodiments, features and effects of the phosphorus-free plastic material for casting and the preparation method thereof according to the present invention are as follows.
Example 1: phosphorus-free plastic material for casting and preparation method thereof
The phosphorus-free plastic material for casting comprises the following components in percentage by weight: 69% of high-purity calcined tabular corundum and high-purity low-sodium alpha-Al 2 O 3 11% of micro powder, 6% of fused cast zirconia-corundum micro powder, 5% of aluminum sulfate powder, 1.5% of sodium silicate powder, 3% of metallurgical coke powder, 3% of 97% of silicon micro powder and 1.5% of metal aluminum powder.
A preparation method of phosphorus-free plastic material for casting comprises the following steps:
s1, preparing high-purity calcined tabular corundum and high-purity low-sodium alpha-Al 2 O 3 Micro powder, fused cast zirconia corundum micro powder, aluminum sulfate powder, sodium silicate powder, metallurgical coke powder, 97% silicon micro powder and metal aluminum powder;
s2, calcining high-purity tabular corundum raw material (0.045-1 mm) and high-purity low-sodium alpha-Al 2 O 3 Adding the micro powder, the fused cast zirconia-corundum micro powder, the aluminum sulfate powder, the metallurgical coke powder, the silicon micro powder and the metal aluminum powder into a mixer for premixing for 5 minutes;
s3, mixing the material premixed in the step S2, sodium silicate powder and a high-purity calcined tabular corundum raw material (1-6 mm) in a planetary mixer for 5 minutes;
s4, when the raw materials are agglomerated and are not uniformly mixed in the step S3, mixing for 5 minutes, adding tap water with the mass of 6.0 percent of the total mass after the raw materials are uniformly mixed, and continuously mixing for 10 minutes to discharge so as to obtain the finished product phosphorus-free plastic material.
Example 2: the phosphorus-free plastic material for casting comprises the following components in percentage by weight: 69% of high-purity calcined tabular corundum and high-purity low-sodium alpha-Al 2 O 3 12% of micro powder, 7% of fused cast zirconia-corundum micro powder, 3% of aluminum sulfate powder, 1.68% of sodium silicate powder, 3% of metallurgical coke powder, 3% of 97% of silicon micro powder and 1.32% of metal aluminum powder;
high purity low sodium alpha-Al 2 O 3 Al in micro powder 2 O 3 The content is 99.8 percent, the content of sodium oxide is less than 0.10 percent, and the particle size is 1.8-2.5 mu m; fused cast zirconia corundumMicro-powder ZrO 2 Content of 31.5% Al 2 O 3 Content of 46.5% SiO 2 Less than or equal to 20.0 percent; the grain diameter is more than or equal to 0.075 mm; SiO in sodium silicate powder 2 65.0% of Na 2 The O content was 34.5%, and the modulus was 2.10.
According to the formula
The amount of sodium silicate powder added was calculated as: 1.68 percent.
Wherein, w is the mass percentage of the sodium silicate powder;
W 1 is alpha-Al 2 O 3 A is alpha-Al 2 O 3 Middle Al 2 O 3 The mass percentage of (A);
W 2 is the mass percentage of the fused cast zirconia-corundum micro powder, and b is Al in the fused cast zirconia-corundum micro powder 2 O 3 The mass percentage of (A);
p is the modulus of the sodium silicate.
A preparation method of phosphorus-free plastic material for casting comprises the following steps:
s1, preparing high-purity calcined tabular corundum, high-purity low-sodium alpha-Al 2 O 3 Micro powder, fused cast zirconia corundum micro powder, aluminum sulfate powder, sodium silicate powder, metallurgical coke powder, 97% silicon micro powder and metal aluminum powder;
s2, calcining high-purity tabular corundum raw material (0.045-1 mm) and high-purity low-sodium alpha-Al 2 O 3 Adding the micro powder, the fused cast zirconia-corundum micro powder, the aluminum sulfate powder, the metallurgical coke powder, the silicon micro powder and the metal aluminum powder into a mixer for premixing for 5 minutes;
s3, mixing the material premixed in the step S2, sodium silicate powder and a high-purity calcined tabular corundum raw material (1-6 mm) in a planetary mixer for 5 minutes;
and S4, when the raw materials are agglomerated and not uniformly mixed in the step S3, mixing for 5 minutes, adding tap water with the total mass of 6.0 percent after the raw materials are uniformly mixed, and continuously mixing for 10 minutes to discharge the materials to obtain the finished product phosphorus-free plastic material.
Example 3: the phosphorus-free plastic material for casting comprises the following components in percentage by weight: 70% of high-purity calcined tabular corundum and high-purity low-sodium alpha-Al 2 O 3 11% of micro powder, 7% of fused cast zirconia corundum micro powder, 3.3% of aluminum sulfate powder, 1.20% of sodium silicate powder, 3% of metallurgical coke powder, 3% of 97% of silicon micro powder and 1.5% of metal aluminum powder.
High purity low sodium alpha-Al 2 O 3 Al in micro powder 2 O 3 The content is 99.8 percent, the content of sodium oxide is less than 0.10 percent, and the grain diameter is 1.8-2.5 mu m; fused cast zirconia corundum micropowder ZrO 2 Content of 31.5% Al 2 O 3 Content of 46.5%, SiO 2 Less than or equal to 20.0 percent; the grain diameter is more than or equal to 0.075 mm; SiO in sodium silicate powder 2 65.0% of Na 2 The O content was 34.5%, and the modulus was 2.10.
According to the formula
Calculating the addition of sodium silicate to be 1.20%;
wherein T is 1 Is 1200 ℃ and T 2 The maximum temperature of heating during casting was 1650 ℃ in units of ℃.
A preparation method of phosphorus-free plastic material for casting comprises the following steps:
s1, preparing high-purity calcined tabular corundum and high-purity low-sodium alpha-Al 2 O 3 Micro powder, fused cast zirconia corundum micro powder, aluminum sulfate powder, sodium silicate powder, metallurgical coke powder, 97% silicon micro powder and metal aluminum powder;
s2, calcining high-purity tabular corundum raw material (0.045-1 mm) and high-purity low-sodium alpha-Al 2 O 3 Adding the micro powder, the fused cast zirconia-corundum micro powder, the aluminum sulfate powder, the metallurgical coke powder, the silicon micro powder and the metal aluminum powder into a mixer for premixing for 5 minutes;
s3, mixing the material premixed in the step S2, sodium silicate powder and a high-purity calcined tabular corundum raw material (1-6 mm) in a planetary mixer for 5 minutes;
and S4, when the raw materials are agglomerated and not uniformly mixed in the step S3, mixing for 5 minutes, adding tap water with the total mass of 6.0 percent after the raw materials are uniformly mixed, and continuously mixing for 10 minutes to discharge the materials to obtain the finished product phosphorus-free plastic material.
Example 4: the phosphorus-free plastic material for casting comprises the following components in percentage by weight: 70% of high-purity calcined tabular corundum and high-purity low-sodium alpha-Al 2 O 3 11% of micro powder, 7% of fused cast zirconia corundum micro powder, 3.4% of aluminum sulfate powder, 1.20% of sodium silicate powder, 3% of metallurgical coke powder, 3% of 97% of silicon micro powder and 1.4% of metal aluminum powder.
High purity low sodium alpha-Al 2 O 3 Al in micro powder 2 O 3 The content is 99.8 percent, the content of sodium oxide is less than 0.10 percent, and the particle size is 1.8-2.5 mu m; fused cast zirconia corundum micropowder ZrO 2 Content of 31.5% Al 2 O 3 Content of 46.5% SiO 2 Less than or equal to 20.0 percent; the grain diameter is more than or equal to 0.075 mm; SiO in sodium silicate powder 2 65.0% of Na 2 The O content was 34.5%, and the modulus was 2.10.
According to the formula
Calculating the addition of sodium silicate to be 1.20%;
wherein T is 1 Is 1200 ℃ and T 2 The maximum temperature of heating at the time of casting was 1650 ℃ in units of ℃.
According to the formula
Calculating the adding amount of the aluminum sulfate powder to be 3.4%;
wherein c is Na in the sodium silicate 2 The mass percent of O;
d is SiO in sodium silicate 2 The mass percentage of (A).
A preparation method of phosphorus-free plastic material for casting comprises the following steps:
s1, preparing high-purity calcined tabular corundum and high-purity low-sodium alpha-Al 2 O 3 Micro powder, fused cast zirconia corundum micro powder, aluminum sulfate powder, sodium silicate powder, metallurgical coke powder, 97% silicon micro powder and metal aluminum powder;
s2, mixing the high-purity calcined tabular corundum raw material (0.045-1 mm) with the high-purity low-sodium alpha-Al 2 O 3 Adding the micro powder, the fused cast zirconia-corundum micro powder, the aluminum sulfate powder, the metallurgical coke powder, the silicon micro powder and the metal aluminum powder into a mixer for premixing for 5 minutes;
s3, mixing the material premixed in the step S2, sodium silicate powder and a high-purity calcined tabular corundum raw material (1-6 mm) in a planetary mixer for 5 minutes;
and S4, when the raw materials are agglomerated and not uniformly mixed in the step S3, mixing for 5 minutes, adding tap water with the total mass of 6.0 percent after the raw materials are uniformly mixed, and continuously mixing for 10 minutes to discharge the materials to obtain the finished product phosphorus-free plastic material.
Comparative example 1: conventional phosphorus-free plastic material on market
Comparative example 2:
the formulation of the components in this comparative example did not contain sodium silicate powder, the other components were present in the same amounts as in example 1, and the preparation was also in the same manner as in comparative example 1.
Comparative example 3:
the formulation of the components in this comparative example was identical to that of example 4, with the addition of 1% sodium silicate powder, and the preparation was also identical to that of example 4.
Performance testing
The phosphorus content in the finished products of the examples is detected by sending out the products of the examples 1 to 4 and the comparative examples 1 to 3; each example was pressed into a standard test block of 40X 160mm by a thermosetting hydraulic press molding machine, and the linear change after firing and the corresponding flexural and compressive strength thereof at different temperatures were examined. The test results are shown in the following table:
TABLE 1 Performance test results for examples 1-4 and comparative examples 1-3
The finished product is subjected to quality supervision and detection of national light industrial ceramics/refractory materials, and the P in the embodiments 1-4 2 O 5 The% content is far lower than that of the similar products in the market, and the plastic is proved to be phosphorus-free. The test results show that the phosphorus-free plastic material has excellent high-temperature volume stability and high-temperature rupture and pressure resistant strength, solves the problem of short service life caused by poor volume stability and low strength in the use process of the conventional phosphorus-free plastic material, and has the leading level in the market.
The finished product package of the phosphorus-free plastic material provided by the invention specifically comprises the following components: the qualified phosphorus-free plastic material to be detected is packaged, and the paper box or the plastic barrel can be selected for use according to different requirements of customers to carry out automatic packaging, so that the production efficiency is favorably improved, and the finished product phosphorus-free plastic material is obtained.
The phosphorus-free plastic material provided by the invention can be used after being directly unpacked during construction, the proportion of the phosphorus-free plastic material is strictly controlled in the production process, the influence of human factors on the construction quality is small in the repeated work of ramming, and the quality of a furnace lining is easily ensured. The construction method can directly carry out ramming construction according to the specific shape and size of field equipment, and the die can be immediately removed after construction, so that the construction method has good construction performance particularly in the construction of complex furnace tops. And after construction is finished, naturally curing for 12-48 hours (the ideal curing temperature is 22-30 ℃) according to the client site conditions, then baking according to the corresponding temperature rise curves of different construction thicknesses, and putting into normal production after baking is finished.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The phosphorus-free plastic material for casting is characterized by comprising the following chemical components in percentage by mass: al (Al) 2 O 3 ：78%~88%、SiO 2 ：6%~10%、ZrO 2 : 2% -4% and C: 2% -3%;
the coating comprises the following components in percentage by mass: calcined tabular corundum 60-70%, alpha-Al 2 O 3 8-12% of fused cast zirconia corundum micro powder, 4-7% of fused cast zirconia corundum micro powder, 4-5.5% of aluminum sulfate powder and sodium silicate powder, 2-3% of metallurgical coke powder, 2-3% of silicon micro powder and 1-1.5% of aluminum powder;
the sodium silicate powder is added in the following amount by mass percent
；
Wherein w is the mass percentage of the sodium silicate powder;
W 1 is said alpha-Al 2 O 3 A is the alpha-Al 2 O 3 Middle Al 2 O 3 The mass percentage of (A);
W 2 is the mass percentage of the fused cast zirconia-corundum micro powder, and b is Al in the fused cast zirconia-corundum micro powder 2 O 3 The mass percentage of (A);
p is the modulus of the sodium silicate powder;
T 1 is 1200 ℃ and T 2 The unit is the highest temperature of heating in casting; t is 2 ＞T 1 ；
The adding amount of the aluminum sulfate powder is calculated according to the mass percentage
；
Wherein c is Na in the sodium silicate powder 2 The mass percent of O;
d is SiO in the sodium silicate powder 2 Mass ofAnd (4) scoring.
2. The phosphorus-free plastic material for casting according to claim 1, wherein the α -Al is 2 O 3 The content of alumina is more than 99.7 percent, the content of sodium oxide is less than 0.10 percent, and the grain diameter is 1.8 to 2.5 mu m.
3. The phosphorus-free plastic casting material as claimed in claim 1, wherein the fused cast zirconia corundum micropowder comprises ZrO 2 Content is not less than 31.5%, Al 2 O 3 The content is more than or equal to 46.5 percent, and SiO is 2 Less than or equal to 20.0 percent and the grain diameter is less than or equal to 0.075 mm.
4. The phosphorus-free plastic material for casting according to claim 1, wherein SiO is in sodium silicate powder 2 65.0% of Na 2 The O content was 34.5%, and the modulus was 2.10.
5. The phosphorus-free castable for casting according to claim 1, wherein Al of tabular corundum is calcined 2 O 3 The content is more than or equal to 99.5 percent, and the particle size is 0.045 mm-6 mm.
6. The preparation method of the phosphorus-free plastic material for casting according to any one of claims 1 to 5, characterized by comprising the following steps:
s1, preparing calcined tabular corundum, alpha-Al 2 O 3 Micro powder, fused cast zirconia corundum micro powder, aluminum sulfate powder, sodium silicate powder, metallurgical coke powder, silicon micro powder and aluminum powder;
s2, calcining plate-shaped corundum and alpha-Al 2 O 3 Adding the micro powder, the fused cast zirconia-corundum micro powder, the aluminum sulfate powder, the metallurgical coke powder, the silicon micro powder and the aluminum powder into a mixer for premixing;
s3, putting the premixed material in the step S2 and sodium silicate powder into a planetary mixer for mixing;
s4, when the raw materials are agglomerated and not uniformly mixed in the step S3, the raw materials need to be mixed again, after all the raw materials are uniformly mixed, the materials are uniformly mixed, water is added, and the mixing is continued.
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