CN116120042A - Method for closely stacking refractory material matrixes and refractory material - Google Patents
Method for closely stacking refractory material matrixes and refractory material Download PDFInfo
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Abstract
The invention provides a method for closely stacking refractory materials and application thereof, wherein the method comprises the following steps: the method comprises the following steps of (1) weighing raw materials according to the following proportion: 50-55wt% of large-particle aggregate, 18-20wt% of medium-particle aggregate, 0-10wt% of 200-mesh powder matrix, 15-20wt% of 200-325-mesh powder matrix and 0-9wt% of 325-mesh powder matrix; (2) After raw materials are proportioned, a binding agent or water is added for mixing, and the mixed pug is subjected to machine pressing or casting molding and drying. The method of the invention is matched with the principle of the closest packing of large particles, medium particles and fine powder in the refractory material ingredients, and adopts the principle of large middle and small two ends aiming at the fine powder part of the refractory material matrix, thereby achieving the closest packing of the refractory material aggregate and the whole matrix, and further improving the performance of the refractory material.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a method for tightly stacking refractory material matrixes and application thereof.
Background
The refractory material needs to have a certain porosity but still needs to have a sufficiently high bulk density. To achieve higher bulk densities, it is desirable that different sized particles in the furnish create a greater bulk density. I.e. the so-called "close packing" principle. The particles in the refractory batch are generally classified into large particles, medium particles and fine powders. In general, the large particles and the fine powder are larger in content, and the intermediate particles are smaller in content, i.e., the principle of "big at both ends and small in the middle". In this case, the large particles form a skeleton, and the fine powder fills in the voids of the skeleton to form the closest packing. With the development of the micro powder technology, the fine powder is changed from single fineness to multiple particle sizes, and the stacking selectable particle size of the matrix is increased. How to achieve high body density and closest packing, and the mutual matching is still a problem to be solved.
Disclosure of Invention
Based on this, the invention aims to provide a method for closely stacking refractory substrates, which aims at stacking refractory substrate fine powder parts with different particle sizes so as to achieve the aim of the closest stacking of the substrates.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
A method of closely packing a refractory substrate comprising the steps of: the method comprises the following steps of (1) weighing raw materials according to the following proportion: 50-55wt% of large-particle aggregate, 18-20wt% of medium-particle aggregate, 0-10wt% of 200-mesh powder matrix, 15-20wt% of 200-325-mesh powder matrix and 0-9wt% of 325-mesh powder matrix; (2) And (3) after the raw materials are proportioned, adding a binding agent or water for mixing, pressing the mixed pug by a machine or casting for molding, and drying.
In some embodiments, the raw materials are weighed in step (1) in the following proportions: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 1 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix and 1 to 9 weight percent of 325-mesh powder matrix.
In some embodiments, the raw materials are weighed in step (1) in the following proportions: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 0 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix, 0 to 3 weight percent of 325-mesh-less D50<1 mu m powder matrix and 0 to 6 weight percent of 325-mesh-less D50<4 mu m powder matrix.
In some embodiments, the raw materials are weighed in step (1) in the following proportions: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 0 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix, 0.5 to 3 weight percent of 325-mesh-less D50<1 mu m powder matrix and 0.5 to 6 weight percent of 325-mesh-less D50<4 mu m powder matrix.
In some embodiments, the large particle aggregate is selected from 1-8mm platy corundum or 1-5mm fused magnesia; and/or the medium-particle aggregate is selected from 0-1mm plate-shaped corundum or 0-1mm fused magnesia; and/or the greater than 200 mesh fine powder matrix is selected from greater than 200 mesh tabular corundum or greater than 200 mesh graphite; and/or the 200-325 mesh fine powder substrate is selected from 200-325 mesh plate-shaped corundum, 200-325 mesh fused magnesia or 200-325 mesh antioxidant; and/or the less than 325 mesh fine powder matrix is selected from less than 325 mesh SiO 2 At least one of micropowder, alumina micropowder smaller than 325 meshes and aluminate cement smaller than 325 meshes.
The invention also provides a close-packed refractory material, which comprises the following components: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 0 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix and 0 to 9 weight percent of 325-mesh powder matrix.
In some embodiments, the refractory material has a composition of: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 1 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix and 1 to 9 weight percent of 325-mesh powder matrix.
In some embodiments, the refractory material has a composition of: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 0 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix, 0 to 3 weight percent of 325-mesh-less D50<1 mu m powder matrix and 0 to 6 weight percent of 325-mesh-less D50<4 mu m powder matrix.
In some embodiments, the refractory material has a composition of: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 1 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix, 0.5 to 3 weight percent of 325-mesh-less D50<1 mu m powder matrix and 0.5 to 6 weight percent of 325-mesh-less D50<4 mu m powder matrix.
In some embodiments, the large particle aggregate is selected from 1-8mm platy corundum or 1-5mm fused magnesia; and/or the number of the groups of groups,
the medium-grain aggregate is selected from 0-1mm plate-shaped corundum or 0-1mm fused magnesia; and/or the number of the groups of groups,
the fine powder matrix with the size larger than 200 meshes is selected from plate-shaped corundum with the size larger than 200 meshes or graphite with the size larger than 200 meshes; and/or the number of the groups of groups,
the 200-325 mesh fine powder substrate is selected from 200-325 mesh plate-shaped corundum, 200-325 mesh fused magnesia or 200-325 mesh antioxidant; and/or the number of the groups of groups,
the less than 325 mesh fine powder matrix is selected from less than 325 mesh SiO 2 At least one of micropowder, alumina micropowder smaller than 325 meshes and aluminate cement smaller than 325 meshes.
In some embodiments, the refractory material has a composition of: 50-55wt% of 1-8mm plate-shaped corundum, 18-20wt% of 0-1mm plate-shaped corundum, 0-10wt% of 200 mesh-larger plate-shaped corundum, 15-20wt% of 200 mesh-325 mesh plate-shaped corundum and 0-9wt% of less than 325 mesh alumina micropowder.
In some embodiments, the refractory material has a composition of: 50-55wt% of 1-8mm plate-shaped corundum, 18-20wt% of 0-1mm plate-shaped corundum, 1-10wt% of 200 mesh-larger plate-shaped corundum, 15-20wt% of 200 mesh-325 mesh plate-shaped corundum and 1-9wt% of less than 325 mesh alumina micropowder.
In some embodiments, the refractory material has a composition of: 50-55wt% of 1-8mm plate-shaped corundum, 18-20wt% of 0-1mm plate-shaped corundum, 1-10wt% of 200 mesh-larger plate-shaped corundum, 15-20wt% of 200 mesh-325 mesh plate-shaped corundum, 0.5-2wt% of less than 325 mesh D50<1 mu m alumina micropowder and 0.5-3wt% of less than 325 mesh D50<4 mu m alumina micropowder.
In some embodiments, the refractory material has a composition of: 50 to 55 weight percent of 1-8mm plate-shaped corundum, 18 to 20 weight percent of 0-1mm plate-shaped corundum, 1 to 10 weight percent of 200 mesh-larger plate-shaped corundum, 15 to 20 weight percent of 200 mesh-325 mesh-shaped corundum, and less than 325 mesh D50<0.5 to 3 weight percent of alumina micropowder with the diameter of 1 mu m and D50 of less than 325 meshes<4μm SiO 2 0.5 to 3 weight percent of micro powder, less than 325 meshes of D50<0.5 to 3 weight percent of 4 mu m aluminate cement.
In some embodiments, the refractory material has a composition of: 50-55wt% of 1-5mm fused magnesia, 18-20wt% of 0-1mm fused magnesia, 0-10wt% of graphite with a particle size larger than 200 meshes, 12-15wt% of 200-325 meshes of fused magnesia and 3-5wt% of 200-325 meshes of antioxidant.
The invention provides a method for the closest packing of refractory material matrixes and application thereof, aiming at the fine powder part of the refractory material matrixes, the principle of big middle and small two ends is adopted to achieve the closest packing of the matrixes. That is, the medium-sized 200-325 mesh particles account for a larger percentage of the matrix fines; the particles larger than 200 meshes and particles smaller than 325 meshes account for a smaller percentage of the fine powder matrix. Further, the product of the micro powder used for particles smaller than 325 meshes is compounded by adopting different particle size fractions, and the sintering performance and the economy are both considered. The method of the invention is matched with the principle of the closest packing of large particles, medium particles and fine powder in the refractory material ingredients, namely the principle of large middle and small two ends is adopted for the fine powder part of the refractory material matrix, so as to achieve the closest packing of the refractory material aggregate and the whole matrix, thereby improving the volume density of the refractory material, reducing air holes, improving the strength and enabling the refractory material to be easier to sinter.
Detailed Description
The experimental methods of the present invention, in which specific conditions are not specified in the following examples, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. The various chemicals commonly used in the examples are commercially available.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms "comprising" and "having" and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or device that comprises a list of steps is not limited to the elements or modules listed but may alternatively include additional steps not listed or inherent to such process, method, article, or device.
In the present invention, the term "plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
The following description is made with reference to specific embodiments.
Example 1
The embodiment provides a method for the closest packing of mechanically pressed corundum bricks and the mechanically pressed corundum bricks.
According to the principle of the closest packing of refractory materials, the two ends are big and the middle is small, the proportion of large-grain aggregate is 50%, the proportion of medium-grain aggregate is 20%, and the proportion of matrix fine powder is 30%. The fine powder part mainly comprises fine powder of 100 meshes (more than 200 meshes), 200 meshes-325 meshes (intermediate particles) and less than 325 meshes, wherein the particle size of the fine powder is D50<1 μm (the particle size of the fine powder is finer), and the particle size of the fine powder is D50<4 μm (the particle size of the fine powder is coarser). According to the principle of the closest packing of matrix fine powder, the middle is big and the two ends are small, meanwhile, the micro powder is compounded by adopting D50<1 mu m and D50<4 mu m, the sintering property of the micro powder with the D50<1 mu m is good, the price is high, the sintering property of the micro powder with the D50<4 mu m is slightly bad, the price is low, the two micro powder can be compounded, the required sintering property of the product can be met, meanwhile, the economical efficiency is also considered, and the mechanical corundum brick is compounded as shown in the following table 1.
TABLE 1
The required raw materials are mixed according to the aggregate and the powder separately, then the mixture is mixed by a mixer, the aggregate is added firstly during mixing, the mixture is stirred for 2 minutes, 1/2 water is added, wet mixing is carried out for 5 minutes, the fine powder matrix is added, mixing is carried out for 5 minutes, the rest water is added, mixing is carried out for more than 20 minutes, and the materials are discharged after being uniform. And (3) pressing the mixed pug by using an electric screw press according to the required density, and drying at 200 ℃ to obtain the mechanically pressed corundum brick.
Example 2
The embodiment provides a method for closest packing of cast corundum bricks and cast corundum bricks.
According to the principle of the closest packing of refractory materials, the two ends are big and the middle is small, the proportion of large-grain aggregate is 53%, the proportion of medium-grain aggregate is 18%, and the proportion of matrix fine powder is 29%. The fine powder part mainly comprises fine powder of 100 meshes (more than 200 meshes), 200 meshes (intermediate particles) and less than 325 meshes, and the proportion of the corundum castable is shown in the following table 2 according to the principle that the matrix fine powder is most densely packed, namely, large in the middle and small at two ends.
TABLE 2
The preparation method comprises the steps of mixing the required raw materials according to a scheme, adding water into a stirrer to stir, putting the mixture into a mould to perform vibration molding after mixing, and demolding and drying after solidification to obtain the cast corundum brick.
Example 3
The embodiment provides a method for the closest packing of mechanically pressed carbon-containing bricks and the mechanically pressed carbon-containing bricks.
According to the principle of the closest packing of refractory materials, the two ends are big and the middle is small, the proportion of large-grain aggregate is 55 percent, the proportion of medium-grain aggregate is 20 percent, and the proportion of matrix fine powder is 25 percent. The fine powder fraction consisted mainly of 100 mesh (200 mesh or more fraction) and 200 mesh (intermediate granules). The proportions of the mechanically pressed carbonaceous bricks according to the principle of the closest packing of the matrix fine powder, "big in the middle and small at the two ends" are shown in the following table 3.
TABLE 3 Table 3
The preparation method comprises the steps of preparing the required raw materials separately according to aggregate and powder, mixing the raw materials by using a mixer, adding the aggregate during mixing, mixing for 2 minutes, adding 1/2 resin binder, wet mixing for 5 minutes, adding the fine powder matrix, mixing for 5 minutes, adding the residual binder, mixing for more than 30 minutes, and discharging after the materials are uniform. And (3) pressing the mixed pug by using an electric screw press according to the required density, and drying at 200 ℃ to obtain the mechanically pressed carbon-containing brick.
Comparative example 1
This comparative example provides a mechanically pressed corundum brick. According to the principle of the closest packing of refractory materials, the two ends are big and the middle is small, the proportion of large-grain aggregate is 50%, the proportion of medium-grain aggregate is 20%, and the proportion of matrix fine powder is 30%. Wherein the fine powder part is corundum fine powder. The proportions of the mechanically pressed corundum bricks are shown in Table 4 below.
TABLE 4 Table 4
| Percentage by weight | Remarks | |
| 5-1mm plate corundum | 50 | Large particle aggregate |
| 1-0mm plate corundum | 20 | Medium-sized aggregate |
| Corundum fine powder | 30 | Fine powder matrix |
The required raw materials are mixed according to the aggregate and the powder separately, then the mixture is mixed by a mixer, the aggregate is added firstly during mixing, the mixture is stirred for 2 minutes, 1/2 water is added, wet mixing is carried out for 5 minutes, the fine powder matrix is added, mixing is carried out for 5 minutes, the rest water is added, mixing is carried out for more than 20 minutes, and the materials are discharged after being uniform. And (3) pressing the mixed pug by using an electric screw press according to the required density, and drying at 200 ℃ to obtain the corundum brick.
The properties of the refractories in the above examples and comparative examples were examined:
the volume density detection method comprises the following steps: GB/T2997-2000.
The normal temperature flexural strength detection method comprises the following steps: GB/T3001-2007.
The normal temperature compressive strength detection method comprises the following steps: GB/T5072-2008.
The results are shown in Table 5:
TABLE 5
| Group of | Bulk density g/cm 3 | Normal temperature flexural strength MPa | Normal temperature compressive strength MPa |
| Example 1 | 3.25 | 14.5 | 60 |
| Example 2 | 3.20 | 18 | 100 |
| Example 3 | 3.05 | 6.0 | 20 |
| Comparative example 1 | 3.20 | 13.8 | 50 |
The above results indicate that the inventive method achieves the closest packing of the refractory matrix (examples 1-3), effectively increasing the bulk density of the refractory. In comparison with example 1, the refractory fine powder matrix portion in comparative example 1 does not adopt the stacking principle of "large middle and small ends", and the bulk density, normal temperature flexural strength and normal temperature compressive strength are correspondingly reduced.
In summary, the method of the invention is matched with the principle of the closest packing of large particles, medium particles and fine powder in the refractory material ingredients, namely the principle of large medium and small two ends is adopted for the fine powder part of the refractory material matrix, thereby achieving the closest packing of the refractory material aggregate and the whole matrix, and further improving the performance of the refractory material.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method of closely packing a refractory substrate comprising the steps of: the method comprises the following steps of (1) weighing raw materials according to the following proportion: 50-55wt% of large-particle aggregate, 18-20wt% of medium-particle aggregate, 0-10wt% of 200-mesh powder matrix, 15-20wt% of 200-325-mesh powder matrix and 0-9wt% of 325-mesh powder matrix; (2) And (3) after the raw materials are proportioned, adding a binding agent or water for mixing, pressing the mixed pug by a machine or casting for molding, and drying.
2. The method of claim 1, wherein the raw materials are weighed in the following proportions in step (1): 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 1 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix and 1 to 9 weight percent of 325-mesh powder matrix.
3. The method of claim 1, wherein the raw materials are weighed in the following proportions in step (1): 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 0 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix, 0 to 3 weight percent of 325-mesh-less D50<1 mu m powder matrix and 0 to 6 weight percent of 325-mesh-less D50<4 mu m powder matrix.
4. A method according to claim 3, wherein in step (1) the raw materials are weighed in the following proportions: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 0 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix, 0.5 to 3 weight percent of 325-mesh-less D50<1 mu m powder matrix and 0.5 to 6 weight percent of 325-mesh-less D50<4 mu m powder matrix.
5. A method according to any one of claims 1 to 4, wherein the large particle aggregate is selected from 1-8mm platy corundum or 1-5mm fused magnesia; and/or the medium-particle aggregate is selected from 0-1mm plate-shaped corundum or 0-1mm fused magnesia; and/or the greater than 200 mesh fine powder matrix is selected from greater than 200 mesh tabular corundum or greater than 200 mesh graphite; and/or the 200-325 mesh fine powder substrate is selected from 200-325 mesh plate-shaped corundum, 200-325 mesh fused magnesia or 200-325 mesh antioxidant; and/or the less than 325 mesh fine powder matrix is selected from less than 325 mesh SiO 2 At least one of micropowder, alumina micropowder smaller than 325 meshes and aluminate cement smaller than 325 meshes.
6. A close-packed refractory material, wherein the refractory material has a composition of: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 0 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix and 0 to 9 weight percent of 325-mesh powder matrix.
7. The close-packed refractory of claim 6, wherein the refractory has a composition of: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 1 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix and 1 to 9 weight percent of 325-mesh powder matrix.
8. The close-packed refractory of claim 6, wherein the refractory has a composition of: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 0 to 10 weight percent of 200-mesh powder matrix, 15 to 20 weight percent of 200-mesh-325-mesh powder matrix, 0 to 3 weight percent of 325-mesh-less D50<1 mu m powder matrix and 0 to 6 weight percent of 325-mesh-less D50<4 mu m powder matrix.
9. The close-packed refractory of claim 8, wherein the refractory has a composition of: 50 to 55 weight percent of large-grain aggregate, 18 to 20 weight percent of medium-grain aggregate, 1 to 10 weight percent of fine powder matrix with more than 200 meshes, 15 to 20 weight percent of fine powder matrix with 200 meshes to 325 meshes, 0.5 to 3 weight percent of fine powder matrix with less than 325 meshes of D50<1 mu m, and 0.5 to 6 weight percent of fine powder matrix with less than 325 meshes of D50<4 mu m.
10. A close-packed refractory according to any one of claims 6 to 9, wherein the large particle aggregate is selected from 1-8mm platy corundum or 1-5mm fused magnesia; and/or the number of the groups of groups,
the medium-grain aggregate is selected from 0-1mm plate-shaped corundum or 0-1mm fused magnesia; and/or the number of the groups of groups,
the fine powder matrix with the size larger than 200 meshes is selected from plate-shaped corundum with the size larger than 200 meshes or graphite with the size larger than 200 meshes; and/or the number of the groups of groups,
the 200-325 mesh fine powder substrate is selected from 200-325 mesh plate-shaped corundum, 200-325 mesh fused magnesia or 200-325 mesh antioxidant; and/or the number of the groups of groups,
the less than 325 mesh fine powder matrix is selected from less than 325 mesh SiO 2 At least one of micropowder, alumina micropowder smaller than 325 meshes and aluminate cement smaller than 325 meshes.
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