Refractory packing mass

FIELD: manufacturing refractory materials.

SUBSTANCE: refractory packing mass comprises, in mass %, 51-61 of grain corundum, 32-43 of the mixture of fine corundum and refractory clay, and 5.5-7.5 of orthophosphoric acid.

EFFECT: enhanced strength.

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The invention relates to the production of refractory materials, in particular refractory ramming mass on the basis of corundum refractory aggregates and clay plasticizers, and can mainly be used in the metallurgical and other industries for the manufacture of printed linings of various high-temperature units, such as heads and sockets of casting ladles Central parts of the arches arc furnaces and electric furnaces extracts of liquid iron and smelting of aluminum.

Known refractory ramming mass copyright certificate of the USSR No. 897755, 1982, From 04 To 33/22, which is used to perform the padded linings for ladles and contains 55-65 wt.% high alumina fireclay, 20-30 wt.% corundum waste abrasive production, 5-10 wt.% refractory clay, 0.25 to 1.50 wt.% polyphosphate sodium and 4,75-8.50 wt.% orthophosphoric acid. Use this refractory ramming mass as a filler of high alumina fireclay leads to an insufficient high strength lining after it is fired at a temperature of 1580°characterized by the limit of compressive strength is not higher than 37-41 N/mm2. A relatively high percentage in the weight of orthophosphoric acid and the presence in its composition of sodium polyphosphate quite significant the initial linear growth of the lining after it is fired at a temperature of 1580° With, characterized by changes in linear dimensions at the level of 0.9 to 1.0%. In addition, a relatively large percentage in the mass of refractory clay does not allow for its high refractory properties, which limit the recommended temperature range of services within 1500-1700°C.

Known refractory ramming mass by the patent of Ukraine No. 27903, 2000 04 33/22, which is used to perform monolithic linings induction channel furnaces aging cast iron and contains 50-55 wt.% electro-fused corundum FR. the 3.0-0.5 mm, 32-37 wt.% alumina Ledger, 4-6 wt.% quartz sand and 7-9 wt.% orthophosphoric acid. A relatively high percentage in the weight of orthophosphoric acid and alumina, as well as the presence in its composition of quartz sand quite significant linear growth of the lining after it is fired at a temperature of 1580°With which, as shown by experimental studies of the applicant, accompanied by a change in the linear dimensions in the range 1.2 to 1.5%. The presence of this mass of quartz sand leads to insufficiently high refractory properties obtained on its basis linings, characterized by an operating temperature of the services is not more than 1600°C. Besides, it is necessary to obtain high strength linings for the formation of mullite and non-degradable f is Shatov aluminum when firing the lining on the basis of this mass flow is relatively slow, that requires a very long time, we burn the lining at a temperature of about 1600°With an average of 6-8 hours.

Known refractory ramming mass by the patent of Russian Federation №2074148, 1997, 28/34 04, 04 35/10, which is used to perform the padded lining of casting ladles in the steel casting with out-of-furnace processing and contains 81-85 wt.% high-alumina component, 7-12 wt.% refractory clay and 7-10 wt.% a mixture of an aqueous solution of orthophosphoric acid with a concentration of 40-50% and an aqueous solution of urea with a concentration of 30%, taken in the ratio of 70:30. Necessary to ensure the ductility of this refractory ramming mass when the gasket a relatively high percentage of refractory clay leads to an insufficient high refractory properties of linings on its basis, characterized by the temperature chetyrekhvalentnogo compression within 1580-1600°and the limit of compressive strength after firing, comprising 70-80 N/mm2and also to a relatively high open porosity linings after firing in the range of 22-24% and, in addition, significant changes in linear dimensions after firing.

Most are similar in composition and physical-mechanical characteristics to the proposed refractory ramming mass should be considered refractory mass for beskonechnoi gaskets on verscom the certificate of the USSR No. 1447792, 1988, 28/34 04, which is used to perform the padded linings for ladles and contains 5,95-8.50 wt.% phosphoric acid, 7-12 wt.% a mixture of refractory clays of high and low plasticity, taken in the ratio(1,0:1,5)-(1,5:1,0), 0,05-0,50 wt.% alkylsilane and high-alumina component as the rest. This refractory mass, selected the closest analogue, prepared in a mixing unit, downloading the first granular alumina component, which is a placeholder, then an aqueous solution of orthophosphoric acid with a density of 1.3-1.4 g/cm and then together with alkylsilanes it component containing a mixture of fine refractory clays of high and low plasticity and fine alumina component.

Despite the relatively high percentage in this refractory mass is not just a refractory clay, and mixtures of refractory clays of high and low ductility, she, like all of the above analogues, characterized by insufficiently high plasticity that when the gasket is not doing enough udoboukladyvaemost. While a high percentage of refractory clay causes the lining based on it have a sufficiently high open porosity, component after drying and firing, respectively 18-20% 22-24%, sravnitelniiat ultimate compressive strength after firing, constituting not more than 71-80 N/mm2and not enough high temperature deformation under load, characterized by the temperature chetyrekhvalentnogo compression is not more than 1600°C.

Therefore, the disadvantages of the known refractory mass for beskonechnoi gaskets, selected for the nearest equivalent, are sufficiently high open porosity, insufficient strength after firing and not enough high refractory properties obtained on its basis linings and low ductility of the refractory mass, not contributing to its workability.

The objectives of this invention is to reduce the open porosity, increased strength and refractory properties of linings, obtained on the basis of the proposed refractory ramming mass, as well as improving the workability of refractory ramming mass by increasing its plasticity.

The task is solved according to the invention by the fact that the proposed refractory ramming mass, containing, in accordance with the closest analogue, granular alumina component, phosphoric acid and the mixture is finely dispersed alumina component and refractory clay, differs from the closest analogue is the fact that it contains as granular alumina component, a mixture of granular corundum FR. 1-3 mm and FR. 0.5-1.0 mm, taken in the rate of(4,5:1)-(5,5:1), and as a mixture of finely dispersed alumina component and refractory clay mixture 91-95 wt.% corundum and 5-9 wt.% refractory clay content in the mixture of particles less than 50 μm is not less than 50% and is larger than 63 μm is not more than 20% in the following ratio, wt.%:

the mixture of granular corundum FR. 1-3 mm and FR. 0.5-1.0 mm - 51-61,

a mixture of finely dispersed alumina and fireclay - 32-43,

phosphoric acid - 5,5-7,5.

This refractory ramming mass contains as a finely dispersed mixture of corundum and refractory clay their mechanical mixture or a mixture of a joint grinding.

Using the proposed refractory ramming mass as granular alumina component granular corundum number 51-61 wt.%, and a mixture of finely dispersed alumina and fireclay in the number of 32-43 wt.% with the content of finely dispersed oxide in the above-mentioned mixture in the amount 91-95 wt.% led to an increase in the overall percentage of corundum refractory ramming mass, that is, the component having refractory properties, and to reduce the percentage of refractory clay, which caused the increase refractory properties obtained on the basis of the linings. The decrease in the percentage of refractory clay has also led to reduced open porosity of the lining of the donkey firing at a temperature of 1600° C. in Addition, the decrease in the percentage of refractory clay provides a reduction in the intensity of the process mulitauaopele during firing, resulting in a reduced change in linear dimensions of the lining.

However, despite the decrease in the percentage of refractory clay, providing ductility of refractory masses with their stuff, plasticity, we offer refractory ramming mass is not decreased, but rather increased, thereby enhancing the workability of refractory ramming mass and has led to improvements in the quality of its packing. According to the authors of the invention, this is achieved, firstly, through the use of the proposed refractory ramming mass as a mixture of finely dispersed alumina component and refractory clay mixture 91-95 wt.% corundum and 5-9 wt.% refractory clay content in the mixture of particles less than 50 μm is not less than 50% and is larger than 63 μm is not more than 20%. The use of such amount of the fine corundum specified dispersion in a mixture of fine refractory clay causes an increase in anti-friction properties not only of the particles of this mixture, but the grains of the granular corundum, enveloped when mixing the fine particles, and therefore makes a refractory ramming mass is more plastic at stuffing lining. In the which, used in refractory ramming mass, it is a mixture of finely dispersed alumina and refractory clay, for example, mechanical mixture or a mixture of a joint grinding, leads to a more uniform distribution of the fine particles of oxide and refractory clay refractory ramming mass, which contributes to its greater plasticity. This refractory ramming mass has a greater plasticity in the case of use in its mixture of joint grinding fine corundum, refractory clay, as in this case, the clay particles are more evenly distributed among the fine particles of corundum and increases the chemical activity of these particles. Thirdly, the high ductility of refractory ramming mass provides an intelligent choice for a mixture of granular corundum size it used fractions and the ratio of their quantitative content, i.e. a mixture of granular corundum FR. 1-3 mm and FR. 0.5-1.0 mm, taken in the ratio(4,5:1)-(5,5:1).

In addition, the rational choice for a mixture of quantitative content and sizes used fractions granular corundum, i.e. granular corundum FR. 1-3 mm and FR. 0.5-1.0 mm, taken in the ratio(4,5:1)-(5,5:1), and rational choice percentage in a mixture of finely dispersed alumina and refractory clay and restrictions on interest containing the s of particles with a certain dispersion, that is, 91-95 wt.% corundum and 5-9 wt.% refractory clay content in the mixture of particles less than 50 μm is not less than 50% and is larger than 63 μm is not more than 20%, has a more dense structure matrices obtained lining that, on the one hand, leads to a reduction of open porosity, resulting in increased metal and lacoustics, and, on the other hand, to increase the limit of compressive strength, especially after her firing. It also plays a positive role use in refractory ramming mass, it is a mixture of finely dispersed alumina and refractory clay, for example, mechanical mixture or a mixture of a joint grinding, providing a more uniform distribution of the fine particles of oxide and refractory clay refractory ramming mass, thereby increasing the ultimate strength in compression and reduction of open porosity. This refractory ramming mass has a higher compressive strength and lower open porosity in the case of use in its mixture of joint grinding fine corundum, refractory clay, because the clay particles are more evenly distributed among the fine particles of corundum and increases the chemical activity of these particles.

These qualitative and quantitative what's the ratio of components of the proposed refractory ramming mixtures were obtained by the inventors empirically and are the most acceptable, because beyond the claimed quantitative ratios of components mass declared above technical result is not achieved.

Indeed, as shown by experimental research prototypes refractory ramming mass and linings on its basis, using the mixture of granular corundum less than 51 wt.% reduced refractory and mechanical properties of liner materials based on refractory ramming mass, as in the case of a mixture of granular corundum 61 wt.% significantly deteriorate the ductility of the mass and the open porosity of the lining. In the case of using a mixture of granular corundum other factions, the applicant has failed to obtain a refractory ramming mass, corresponding to the declared technical result. When going beyond the quantitative ratio of the content in a mixture of granular corundum FR. 1-3 mm and FR. 0.5-1.0 mm, equal(4,5:1)-(5,5:1), the declared technical result for the proposed refractory ramming mixes the applicant to obtain also failed.

When the weight of the mixture of finely dispersed alumina and fireclay less than 32 wt.% significantly decreases the ductility of refractory ramming mass, which worsens the workability and reduces the limit of compressive strength after firing and increases open on istest obtained on its basis linings. The increase in the concentration in weight of the mixture of finely dispersed alumina and fireclay more than 43 wt.% leads to excessive plasticity refractory ramming mass, which causes a decrease in the quality gaskets when doing lining, and also causes deterioration of all the above physico-mechanical properties of the lining associated with excessive increase of the content in the mass of refractory clay.

The decrease in finely dispersed mixture of corundum and refractory clay content of corundum up to values smaller 91 wt.%, and the corresponding increase in the content of refractory clay more than 9 wt.% also leads to reduction of the refractory properties of the lining and the deterioration of its main physical-mechanical parameters, as the open porosity, the change in linear dimensions and ultimate compressive strength after firing due to the lower intensity of the reaction of formation of mullite during burning of the lining. Conversely, an increase in a mixture of finely dispersed alumina and refractory clay content of corundum up to a value more than 95 wt.%, and the corresponding reduction of refractory clay content below 5 wt.% reduce the workability of the mass associated with the reduction of its ductility and lower strength in compression.

Use in refractory ramming mass of finely dispersed mixture of the Koruna is and refractory clay, which contains less than 50% of particles less than 50 microns and more than 20% of particles larger than 63 µm does not achieve the declared above objectives of the present invention, since it leads to deterioration of the plasticity of the mass and does not provide the dense structural matrix obtained lining, causing an increase in its open porosity, leading to deterioration of the metal and lacoustics, and the reduction of its ultimate strength in compression, especially after her firing.

The increase of the content in the refractory ramming mass phosphoric acid over 7.5 wt.% practically does not lead to a noticeable increase in strength properties obtained on its basis linings, but causes a very significant change in their linear dimensions after firing, making them sometimes not suitable for use. Reduction in refractory ramming mass phosphoric acid is less than 5.5 wt.% causes a decrease in the strength properties obtained on its basis linings due to lower intensity of flow during burning of the lining of the reaction of formation of non-degradable phosphate of aluminum required to obtain their high strength.

Marked indicates the decision declared above objectives of the present invention due to the presence of the proposed refractory ramming mixtures listed distinguishing features.

the quality of components of the proposed refractory ramming mixtures using a solution of phosphoric acid density of 1.33-1.45 g/cm 3and granular oxide FR. 1-3 mm and FR. 0.5-1.0 mm with an alumina content of not less than of 99.4 wt.% and iron oxide is not more than 0.1 wt.%. In the mixture of finely dispersed components use either finely dispersed sludge electrocorundum FR. -50 μm or finely dispersed oxide FR. -100 μm or a dispersed slurry of electrocorundum FR. -100 ám alumina content of not less than 99,0% and iron oxide is not more than 0.5% and crushed refractory clay with a plasticity number of 15-20 and humidity not more than 12%, such as refractory clay Latnenskogo field or a mixture of a joint grinding of oxide and refractory clay. While delivering the content in a mixture of finely dispersed component particle size of less than 50 μm is not less than 50%, and a particle size of from 63 to 100 μm is not more than 20%.

We offer refractory ramming mass is made as follows. Prepare a mechanical mixture or a mixture of a joint grinding fine corundum number 91-95 wt.% and refractory clay in the number of 5-9 wt.%. Of concentrated phosphoric acid with a density of 1.56 g/cm3and water, taken in the ratio(2,2:1)-(3,7:1), prepare a solution of phosphoric acid of the above density. Mix in the mixer granular corundum FR. 1-3 mm and FR. 0.5-1.0 mm, taken in the ratio(4,5:1)-(5,5:1), within 1-2 minutes, add on smiling the major fraction of the granular corundum solution of orthophosphoric acid and stirred for 1.0-1.5 minutes then add the finely dispersed mixture of corundum and refractory clay and stir for another 2-3 minutes.

Prepared refractory ramming mass is sealed and within 7 days soak in natural conditions.

In the manufacture of linings refractory ramming mass fill, for example, hammers at a pressure of 100-200 kg/cm2, is dried at a temperature of 100-110°C for 24 hours and calcined for 3 hours at a temperature of 1000-1100°when the rate of increase of temperature of 150-200°With in the hour.

For the experimental determination of physico-mechanical properties of the linings of the applicant company had made their prototypes. Test sample No. 1 was obtained on the basis of the refractory mass, selected as a prototype, in accordance with the technology described in the description of the prototype, and test samples No. 2 to No. 6 were obtained on the basis of refractory ramming mass, which is the subject of the present invention, in the test samples No. 2 to No. 5, the percentage of those or other components of the mass was close to the limit values. Test sample No. 6 was the best of its physical and mechanical characteristics.

Test samples were prepared by packing or pressing at a pressure of 200 kg/cm2, was kept in natural conditions 7 days, dried at a temperature of 100-110°the within 24 hours and was annealed for 3 hours at a temperature of 1600° When the rate of increase of temperature of 150-200°With in the hour.

The open porosity was determined according to GOST 2409-95 using kerosene with a density of 0.8 g/cm3as the saturating fluid. The ultimate compressive strength was determined according to GOST 4071-94 on cubes of size 50×50×50 mm when the load applied parallel to the layer stacking. The change in linear dimensions was determined by measuring the size of the cubes before and after heat treatment.

The ductility of refractory ramming mixtures was determined according to a known method (Laboratory of chemical technology of refractory / Suvorov, S. and others. - L: LTI Lensoveta, 1976, pp.62-64). According to this method from the prepared refractory ramming mass was formed five balls without cracks and dents in diameter 46-50 mm To test the balls kept wrapped in a damp cloth. To determine the plasticity used the device Zemyatchenskii, and the plasticity index was calculated by the formula Yp=(Dn-Dto) P, where Yp- index of plasticity; Dn- the initial diameter of the ball; Dto- the final diameter of the sphere; R is the mass of the load at which the sample there is a crack. Based on the values of the pointers plasticity obtained for five samples was determined by the plasticity index for refractory ramming mass in the form of the medium is about the arithmetic of the specified values.

The table shows the values of the percentage of components selected for the prototype refractory ramming mass (sample No. 1) and the proposed refractory ramming mixtures (samples No. 2 to No. 6), and also obtained when testing the values of the main physical-mechanical performance-based prototypes. All test samples were used a mechanical mixture of finely dispersed alumina and refractory clay, and in the best sample No. 6 as a mechanical mixture of finely dispersed alumina and refractory clay, and a mixture of a joint grinding. The values of physico-mechanical characteristics of the lining on the basis of the best sample No. 6 of the proposed refractory ramming mass in the case of use in its mixture of joint grinding finely dispersed alumina and fireclay in the table are indicated in parentheses.

The test results showed for the best sample No. 6 of the proposed refractory ramming mass compared with sample No. 1 of the mass of the prototype, first, a considerable increase in the limit of compressive strength after firing, and in the case of using the mixture of a joint grinding and after drying, secondly, the reduction of open porosity after drying and after firing lining, thirdly, the rise of temperature of deformation under load and, fourthly, some decrease in the change of the line is s size after firing. For all the samples No. 2 to No. 6, and in particular for the best (sample No. 6) of the proposed refractory ramming mass compared with sample No. 1 of the mass of the prototype there is a substantial increase in the plasticity index, which increases workability of refractory ramming mass.

Thus, the proposed refractory ramming mass provides reduced open porosity, increased strength and refractory properties of the linings produced on its basis, and also increase its workability by increasing plasticity.

1. Refractory ramming mass, containing granular alumina component, phosphoric acid and the mixture is finely dispersed alumina component and refractory clay, characterized in that it contains as granular alumina component, a mixture of granular corundum FR. 1-3 mm and FR. 0.5-1.0 mm, taken in the ratio(4,5:1)-(5,5:1), and as a mixture of finely dispersed alumina component and refractory clay mixture 91-95 wt.% corundum and 5-9 wt.% refractory clay content in the mixture of particles less than 50 μm is not less than 50% and is larger than 63 μm is not more than 20% in the following ratio, wt.%:

The mixture of granular corundum FR. 1-3 mm and FR. 0.5-1.0 mm 51-61

A mixture of finely Isperih alumina and fireclay 32-43

Phosphoric acid 5,5-7,5

2. Mass according to claim 1, characterized in that it contains as a finely dispersed mixture of corundum and refractory clay their mechanical mixture.

3. Mass according to claim 1, characterized in that it contains as a finely dispersed mixture of corundum and refractory clay, a mixture of a joint grinding.



 

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