KR20230000389A - Sintering-promoting agent for preparing silica bricks, compound silica brick, and preparation method therefor - Google Patents

Abstract

The present invention relates to the field of producing silica stone bricks, and more specifically, to a sintering-promoting agent for preparing silica bricks, a compound silica brick and a preparing method thereof, and an amorphous-crystalline form composite silica brick prepared by using the sintering-promoting agent and a preparing method thereof. The sintering-promoting agent of the present invention includes silica sol, aluminum hydroxide and titanium bag. The silica brick prepared by using the same can simultaneously exhibit high SiO_2 content, low toxicity, high bonding strength, low-temperature volume stability, and high-temperature masonry integrity of a kiln, and has a long high-temperature lifespan.

Description

Sintering-promoting agent for preparing silica bricks, compound silica brick, and preparation method therefor}

The present invention relates to the field of silica stone brick manufacturing, and more specifically, to a sintering accelerator for producing silica stone bricks and a method for producing the same, and to a composite amorphous-crystalline form silica stone brick manufactured using the sintering accelerator and a method for producing the same.

Traditional silica bricks use crushed natural quartzite as the main raw material, and add calcium oxide, ferrous oxide, aluminum oxide, manganese dioxide, etc. as mineralizers to mitigate the volumetric expansion of quartz during the sintering process during production. By doing so, during sintering, it acts together with the silica to form a glass phase, wraps around the quartz particles and infiltrates the quartz particles, greatly reducing the sintering expansion of the quartz, so that the product forms a dense structure. However, in this method, there is a disadvantage that the mineralizer component added as described above is very harmful when used at high temperatures.

Under these circumstances, the technology related to silica stone bricks in this field has developed in two directions. One direction is to use traditional quartz rock as a raw material, reduce the amount of mineralizer added, and extend the sintering time to alleviate the expansion of quartz during the sintering process, but the effect of this method is limited, and among the produced silica stone bricks The SiO ₂ content generally does not exceed 97%, and in terms of the microscopic structure, the quartz particles are not sufficiently infiltrated, resulting in cracks, which affects the use effect; Another direction of development is pretreatment of quartz rock, that is, fused quartz after pickling and high-temperature melting (the fused quartz is in a glassy state and has an amorphous structure, and the SiO ₂ content in the fused quartz is 99.5% and its can reach the above), and the product made thereof can have a SiO ₂ content of more than 99%, is stable in volume at 1000 ° C or less, and has an expansion rate of basically 0, but the disadvantages of the method are high temperature ( 1000 ℃ or more) in the process of use, it gradually changes from an amorphous form to quartz, and in the process of change, a volume shrinkage of 0.9% is accompanied, which is very dangerous in the use of a kiln, such as kiln deformation or "kiln brick extrusion" risk easily.

Therefore, there is an urgent need to develop a sintering accelerator for producing silica stone bricks and silica stone bricks manufactured using the same. The silica stone brick can reduce harmful components, ensure low-temperature volume stability, and ensure the integrity of the kiln's high-temperature masonry body, thereby reducing the risk of phenomena such as kiln deformation or "drawing", and at the same time, high-temperature lifespan can increase

Considering this, the present invention is submitted.

A first object of the present invention is to provide a novel sintering accelerator for producing silica stone bricks that can solve the technical problems of high toxicity, low bonding strength, and short lifespan at high temperatures of silica stone bricks in the prior art.

A second object of the present invention is to provide a method for preparing the sintering accelerator, which is easy to operate, has good reproducibility, has low toxicity, high bonding strength, and long life at high temperature.

The third object of the present invention is to solve the technical problems of high toxicity of silica stone bricks in the prior art, low bonding strength, low-temperature volume stability, difficulty in implementing high-temperature masonry integrity of the kiln, and short high-temperature lifespan. It is to provide a silica stone brick.

The fourth object of the present invention is to provide a method for manufacturing silica stone bricks that is easy to operate and has good reproducibility, but the silica stone bricks produced by the above method have low toxicity, high bonding strength, low-temperature volume stability, and high-temperature furnace of the kiln Stack integrity can be realized at the same time, and high-temperature life is long.

In order to implement the above object of the present invention, the following technical means were adopted:

The sintering accelerator according to the first embodiment of the present invention may include silica sol, aluminum hydroxide, and titanium bag. Optionally, the silica sol comprises nanoscale silica colloidal particles. The sintering accelerator may be used in the manufacture of silica stone bricks.

In the case of manufacturing a silica stone brick with the sintering accelerator according to the first embodiment of the present invention, bonding strength may be formed due to the ultrafine structure of the composite during molding. In the process of use, a mullite whisker can be formed under a temperature condition of 1300° C. or higher, which improves the bonding strength of the product. Titanium oxide in the sintering accelerator can effectively stabilize the crystallization conversion rate of fused quartz. Specifically, the silica sol of the present invention, in particular, the nano-silica colloidal particles of the silica sol can play a bonding role in the production process, forming a local mullite phase with the aluminum hydroxide fine powder during the sintering process to obtain a green body It is possible to improve the strength of the product, and also, when a titanium bag is added, the conversion of amorphous silica is suppressed, thereby improving the volume stability of the product.

As a result, the silica stone brick manufactured using the sintering accelerator of the present invention can lower toxicity, increase product bonding strength, greatly reduce the risk of kiln deformation, and extend its high-temperature life span.

Optionally, in the first embodiment of the present invention, the silica sol content of the sintering accelerator is 40-80%, the aluminum hydroxide content is 15-50%, and the titanium bag content is 1-10%. For example, in the sintering accelerator, the silica sol content is 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64% %, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, etc., but is not limited thereto; In the sintering accelerator, the content of aluminum hydroxide is 15%, 17%, 19%, 21%, 23%, 25%, 27%, 29%, 31%, 33%, 35%, 37%, 39%, 41 %, 43%, 45%, 47%, 49%, 50%, etc., but is not limited thereto; In the sintering accelerator, the titanium bag content may be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc., but is not limited thereto.

Optionally, the mass ratio of the silica sol, aluminum hydroxide and titanium bag is 40-80: 15-50: 1-10, 40: 15: 1, 50: 20: 3, 60: 30: 5, 70: 40: 7, 80:50:10, 40:50:1, 50:45:3, 60:35:5, 70:25:7, 80:15:10, etc., where the optimal mass ratio is 10:3 : 0.5, and at this time, the effect of the present invention is the best.

Optionally, in the first embodiment of the present invention, the solid content of the silica sol may be 20 to 30%, for example, 20%, 22%, 24%, 26%, 28%, 30%, etc. may, but is not limited thereto.

The method for preparing a sintering accelerator according to the second embodiment of the present invention may include co-milling a mixture of silica sol, aluminum hydroxide, and titanium bag. The sintering accelerator may be used in the manufacture of silica stone bricks.

Optionally, in the second embodiment of the present invention, the co-milling time is 2 hours or more, for example, 2 hours, 2.5 hours, 3 hours, 4 hours, 5 hours or more, but is not limited thereto. don't

For other specific details according to the second embodiment of the present invention, reference can be made to the specific description of the first embodiment. The manufacturing method of the sintering accelerator of the second embodiment of the present invention is not only simple in manufacturing operation, but also has good reproducibility, and the silica stone brick produced using it has low toxicity, high product bonding strength, and long high-temperature life. In addition, the risk of kiln deformation can be greatly reduced.

The silica stone brick according to the third embodiment of the present invention may include the silicon-containing material and the sintering accelerator of the first embodiment of the present invention.

In the third embodiment of the present invention, the silicon-containing material may include fused quartz and fine quartzite powder, and optionally, the silicon-containing material may include fused quartz aggregate, finely fused quartz powder and fine quartzite powder. can include Thus, according to the present invention, it is possible to manufacture composite silica stone bricks of amorphous form-crystalline form, and the silica stone bricks have a higher SiO ₂ content than traditional silica stone bricks, do not shrink even when used for a long time at high temperatures, and have a stable microscopic structure. there is In addition, unlike adding a single quartz rock raw material or a single fused quartz raw material in the traditional method, the present invention can ensure not only stability in the low temperature region, but also the integrity of the kiln brick body at the operating temperature. The silica stone brick according to the third embodiment of the present invention can simultaneously realize high SiO ₂ content, low toxicity, high bonding strength, low-temperature volume stability, and high-temperature masonry integrity of the kiln, and greatly reduce the risk of deformation of the kiln. and has a long life at high temperatures.

Optionally, in the present invention, the fused quartz aggregate has a silica content of 96% or more, an amorphous form silica content of 85% or more, and a critical particle size of 3 mm. 40-55%, the percentage content of 1-0.5mm particle size is 21-38%, and the percentage content of 0.5-0mm particle size is 21-38%; The particle size of the fused quartz fine powder is ≤ 0.088 mm, and the silica content is ≥ 90%; The particle size of the quartz rock fine powder is 0.088 mm or less, and the silica content is 90% or more.

In the fused quartz aggregate, the silica content may be, for example, but not limited to, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, etc.

In fused quartz aggregate, the amorphous form silica content is for example 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97% %, 98%, 99%, etc., but is not limited thereto.

In fused quartz aggregate, the percentage content with a grain size of 3 to 1 mm is, for example, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, etc. but not limited thereto; Percentage content with a particle size of 1 to 0.5 mm is, for example, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33 %, 34%, 35%, 36%, 37%, 38%, etc., but is not limited thereto; Percentage content with a particle size of 0.5 to 0 mm is, for example, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33% , 34%, 35%, 36%, 37%, 38%, etc., but is not limited thereto.

The fused quartz fine powder has a particle size of 0.088 mm or less, and a silica content of 90% or more. Here, the particle size may be, for example, 0.088mm, 0.086mm, 0.084mm, 0.082mm, 0.08mm, 0.07mm, 0.06mm, 0.05mm, etc., but is not limited thereto; The silica content may be, for example, but not limited to, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and the like.

The quartz rock fine powder has a particle size of 0.088 mm or less, and a silica content of 90% or more. Here, the particle size may be, for example, 0.088mm, 0.086mm, 0.084mm, 0.082mm, 0.08mm, 0.07mm, 0.06mm, 0.05mm, etc., but is not limited thereto; The silica content may be, for example, but not limited to, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and the like.

Optionally, in the third embodiment of the present invention, sodium carboxymethylcellulose may be further included.

Optionally, in the third embodiment of the present invention, the silica stone brick comprises 45 to 65 parts of fused quartz aggregate, 10 to 35 parts of fused quartz fine powder, 10 to 30 parts of quartz rock fine powder, 3 to 6 parts of sintering accelerator, 0-0.5 parts sodium carboxymethylcellulose. For example, the fused quartz aggregate may be, but is not limited to, 45 parts, 47 parts, 49 parts, 51 parts, 53 parts, 55 parts, 57 parts, 59 parts, 61 parts, 63 parts, 65 parts, etc.; The fused quartz fine powder may be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 35 parts, etc. not limited; The quartz rock fine powder may be, but is not limited to, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, etc., and the sintering accelerator is 3 parts , 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, etc., but is not limited thereto; Sodium carboxymethylcellulose may be, but is not limited to, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, and the like.

In the method for producing silica stone bricks according to the fourth embodiment of the present invention, the fused quartz aggregate is stirred, and then the sintering accelerator is added and stirred, and then the fused quartz fine powder and quartz rock fine powder are added and stirred to form a mixture material. Step 1) to obtain ; Step 2) of compressing and molding the mixture obtained in step 1) into a base having a desired shape; and step 3) of drying and sintering the molded body of step 2).

Optionally, in the fourth embodiment of the present invention, in step 1), the stirring is performed in a mixer mill, and the mixer mill may be, for example, a Planetary mixer mill or a forced mixer, but is not limited thereto. don't

Optionally, in the fourth embodiment of the present invention, in step 1), the fused quartz aggregate is put into the mixer mill and stirred for 1 minute, and the sintering accelerator is added and then stirred for 1 to 3 minutes (for example, 1 minute , 1.5 minutes, 2 minutes, 2.5 minutes, 3 minutes, etc.) while stirring, after adding the fused quartz fine powder and quartz rock fine powder, for 15 to 20 minutes (eg, 15 minutes, 16 minutes , 17 minutes, 18 minutes, 19 minutes, 20 minutes, etc., but not limited to) stirring.

Optionally, the total stirring time in step 1) is 20 minutes or more, for example, but not limited to, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes or more.

Optionally, in step 1), 45 to 65 parts of fused quartz aggregate, 10 to 35 parts of fused quartz fine powder, 10 to 30 parts of fine quartz rock powder, 3 to 6 parts of sinter accelerator, and 0 to 0.5 parts of sodium carboxymethylcellulose are mixed. do.

Optionally, in the above step 2), the molding pressure during compression molding is 300 tons or more, for example, 300 tons, 320 tons, 340 tons, 360 tons, 380 tons, 400 tons, 500 tons, 600 tons, or 700 tons. , 800 tons, 900 tons, 1000 tons, etc., but is not limited thereto. Optionally, it is formed by a molding press in step 2), and optionally, the molding press is a friction press, an electric program control press or a hydraulic press having a tonnage of 300 tons or more.

Optionally, in step 3), the molded body of step 2) is dried in a temperature environment of 120° C. or less for 20 hours or more, put into a calcining kiln and sintered at a temperature rising rate of 35° C./hour or less. Optionally, the firing kiln in step 3) is an electric heating type or gas type shuttle kiln. Optionally, the sintering temperature of step 3) may be 800 to 1050 ° C, for example, 800 ° C, 850 ° C, 900 ° C, 950 ° C, 1000 ° C, 1050 ° C, etc., but is not limited thereto.

The method for producing silica stone bricks according to the fourth embodiment of the present invention is simple in operation and has good reproducibility, and the produced silica bricks have high SiO ₂ content, low toxicity, high bonding strength, low-temperature volume stability, high-temperature furnace in the kiln Stack integrity can be realized at the same time, and high-temperature life is long.

Compared to the prior art, the beneficial effects of the present invention are as follows:

The novel sintering accelerator for producing silica bricks according to the present invention is easy to manufacture and has good reproducibility, and the silica stone bricks manufactured using the same have low toxicity, high product bonding strength, and long life at high temperatures.

The new silica stone brick according to the present invention is easy to manufacture and has good reproducibility, and the manufactured silica stone brick has high SiO ₂ content, low toxicity, high bonding strength, low-temperature volume stability, and high-temperature masonry integrity of the kiln. and has a long high-temperature life.

In the following, the technical means of the present invention will be more clearly and completely described in conjunction with specific modes for carrying out the invention, but those skilled in the art will understand that the embodiments described below are not all embodiments of the present invention, but some embodiments, It will be understood that the present invention is illustrative only and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor also fall within the protection scope of the present invention. If specific conditions are not indicated in the examples, it is performed according to normal conditions or conditions suggested by the manufacturer. All reagents or instruments used without manufacturer's indication are commercially available commercially available products.

Example 1

48 parts of fused quartz aggregate, 18 parts of fused quartz fine powder, 28.4 parts of quartzite fine powder, 5.5 parts of sintering accelerator, and 0.1 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 10:3:0.5. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press having a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 850 ° C.

Example 2

52 parts of fused quartz aggregate, 19 parts of fused quartz fine powder, 23.8 parts of quartzite fine powder, 5.0 parts of sintering accelerator, and 0.2 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 10:3:0.5. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press with a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 880 ° C.

Example 3

58 parts of fused quartz aggregate, 25 parts of fused quartz fine powder, 12.1 parts of quartzite fine powder, 4.5 parts of sintering accelerator, and 0.4 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 10:3:0.5. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press with a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 900 ° C.

Example 4

45 parts of fused quartz aggregate, 21 parts of fused quartz fine powder, 29.7 parts of quartzite fine powder, 4.0 parts of sintering accelerator, and 0.3 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 10:3:0.5. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press with a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 950 ° C.

Example 5

65 parts of fused quartz aggregate, 10 parts of fused quartz fine powder, 21.9 parts of quartzite fine powder, 3.0 parts of sintering accelerator, and 0.1 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 10:3:0.5. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press with a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 1000 ° C.

Example 6

52 parts of fused quartz aggregate, 19 parts of fused quartz fine powder, 23.8 parts of quartzite fine powder, 5.0 parts of sintering accelerator, and 0.2 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 8.5:4:1. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press with a molding pressure of 630 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 1050 ° C.

Example 7

52 parts of fused quartz aggregate, 19 parts of fused quartz fine powder, 23.8 parts of quartzite fine powder, 5.0 parts of sintering accelerator, and 0.2 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 7:5.5:1. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press with a molding pressure of 630 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 850 ° C.

Example 8

52 parts of fused quartz aggregate, 19 parts of fused quartz fine powder, 23.8 parts of quartzite fine powder, 5.0 parts of sintering accelerator, and 0.2 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 6:6.5:0.5. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press with a molding pressure of 630 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 850 ° C.

Comparative Example 1

52 parts of fused quartz aggregate, 19 parts of fused quartz fine powder, 23.8 parts of quartzite fine powder, 5.0 parts of sintering accelerator, and 0.2 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 5:7:1. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 10 minutes; It was molded with a molding press with a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 850 ° C.

Comparative Example 2

48 parts of fused quartz aggregate, 38 parts of fused quartz fine powder, 8.8 parts of quartzite fine powder, 5.0 parts of sintering accelerator, and 0.2 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 5:7:1. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 10 minutes; It was molded with a molding press with a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 850 ° C.

Comparative Example 3

48 parts of fused quartz aggregate, 38 parts of fused quartz fine powder, 8.8 parts of quartzite fine powder, 5.5 parts of sintering accelerator, and 0.1 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 10:3:0.5. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 10 minutes; It was molded with a molding press with a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 850 ° C.

Comparative Example 4

45 parts of fused quartz aggregate, 21 parts of fused quartz fine powder, 29.7 parts of quartzite fine powder, 4.0 parts of sintering accelerator, and 0.3 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 10:3:0.5. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press with a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 750 ° C.

Comparative Example 5

52 parts of fused quartz aggregate, 19 parts of fused quartz fine powder, 23.8 parts of quartzite fine powder, 5.0 parts of sintering accelerator, and 0.2 part of sodium carboxymethylcellulose are used. Here, the mass ratio of silica sol, aluminum hydroxide, and titanium white in the sintering accelerator is 7:5.5:1. The fused quartz aggregate is put into the mixer mill and stirred for 2 minutes, the sintering accelerator is added and stirred for 3 minutes, and the fused quartz fine powder and quartz rock fine powder are added and stirred for 17 minutes; It was molded with a molding press with a molding pressure of 400 tons, dried for 24 hours in an environment of 110 ° C, and fired in a shuttle kiln at 1150 ° C.

Experimental Example 1

Silica was measured according to GB/T 6901 method for chemical analysis of siliceous refractories.

Experimental Example 2

The pressure resistance test was performed in accordance with GB/T 5072 Standard Room Temperature Pressure Resistance Test Method for Fire Resistant Materials.

Experimental Example 3

The porosity and bulk density were measured according to the GB/T 2997 test methods for bulk density, apparent porosity and true porosity of densely shaped refractory products.

Experimental Example 4

The linear thermal expansion coefficient was measured according to the GB/T 7320 refractory thermal expansion test method.

Experimental Example 5

The detection of the softening point under load was performed according to the YB/T 370 test method for softening point under load for refractory products (non-differential-rising temperature method).

Based on the experimental example, Examples 1 to 8 and Comparative Examples 1 to 5 were measured, and the results are shown in Tables 1 to 3 below.

Example 1 Example 2 Example 3 Example 4 Silica, % 98.42 98.80 99.01 98.07 pressure strength, MPa 42 45 39 48 Porosity, % 18.5 18.4 18.1 17.8 Bulk Density, g/cm ³ 1.85 1.86 1.88 1.90 Linear Thermal Expansion 1000℃ 0.72 0.68 0.73 0.65 Softening point under load, 0.2MPaХT0.6, ℃ 1671 1681 1676 1678

Example 5 Example 6 Example 7 Example 8 Silica, % 99.12 98.63 98.98 98.60 pressure strength, MPa 46 43 49 46 Porosity, % 18.3 18.4 18.9 17.6 Bulk Density, g/cm ³ 1.87 1.86 1.83 1.91 Linear Thermal Expansion 1000℃ 0.70 0.69 0.72 0.68 Softening point under load, 0.2MPaХT0.6, ℃ 1675 1686 1673 1685

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Silica, % 98.06 97.69 97.72 97.63 98.08 pressure strength, MPa 26 25 30 28 32 Porosity, % 20.1 18.5 19.8 19.6 20.2 Bulk Density, g/cm ³ 1.78 1.88 1.84 1.86 1.78 Linear Thermal Expansion 1000℃ 0.93 0.86 0.89 1.02 1.28 Softening point under load, 0.2MPaХT0.6, ℃ 1658 1665 1652 1662 1668

Referring to the contents of Examples 1 to 8 and Comparative Examples 1 to 5, the silica stone bricks prepared according to the examples of the present invention have higher silica content, pressure resistance, bulk density, and load than the silica stone bricks prepared according to the method of Comparative Examples. It can be seen that the softening point is high and the porosity and coefficient of linear thermal expansion are low. In particular, the silica stone bricks according to the examples of the present invention have significantly increased pressure strength, coefficient of linear thermal expansion, and silica content compared to the silica stone bricks prepared according to the comparative example. From this, it can be seen that the silica brick according to the present invention does not need to additionally use calcium oxide, ferrous oxide, aluminum oxide, manganese dioxide, etc. as a mineralizer, so that the risk caused by this can be prevented, that is, toxicity can be reduced. . On this basis, the silica content of the silica stone bricks of the present invention can be as high as 98% or more, even as high as 99% or more, with high pressure resistance, bulk density, high load softening point, low porosity and linear thermal expansion, and excellent performance. It has physical and chemical properties such as abrasion resistance, shrinkage resistance, and hardness, has high bonding strength, and has a long life at high temperature. In other words, the silica stone bricks manufactured according to the present invention can simultaneously realize high SiO ₂ content, low toxicity, high bonding strength, low-temperature volume stability, and high-temperature masonry integrity of the kiln, and have a long high-temperature lifespan.

Furthermore, when comparing Example 2, Examples 6 to 8 and Comparative Example 1, when silica sol, aluminum hydroxide and titanium bag in a certain mass ratio range are used as sintering accelerators, compared to Comparative Example 1 exceeding the corresponding range, It can be seen that the silica content, pressure-resistant strength, bulk density, softening point under load of silica brick can be increased, and the porosity and coefficient of linear thermal expansion can be decreased.

In addition, comparing Example 1 and Comparative Example 3, when the composition ratio added as the sintering accelerator is the same, compared to Comparative Example 3 in which the contents of the fused quartz powder and the fine quartz rock powder exceed a certain range, the silica content of the silica stone bricks , it can be seen that the pressure-resistant strength, bulk density, and softening point under load are lowered, and the porosity and coefficient of linear thermal expansion are increased.

Finally, comparing Example 2, Example 7 and Comparative Example 5, etc., if the firing temperature is too high, the technical effect of the present invention may not be obtained. That is, it can be seen that each measured parameter may drop rapidly.

Finally, it should be noted that: each of the above embodiments is only used to illustrate the technical means of the present invention, and is not restrictive; Although the present invention has been described in detail with reference to each of the above embodiments, a person skilled in the art may modify the technical means described in each of the above embodiments or equally replace some or all of the technical features; It should be understood that such modification or substitution does not cause the essence of the technical means to deviate from the scope of the technical means of each embodiment of the present invention.

Claims (10)

A sintering accelerator for producing silica bricks comprising silica sol, aluminum hydroxide and titanium bag. According to claim 1,
Optionally, in the sintering accelerator, the silica sol content is 40 to 80%, the aluminum hydroxide content is 15 to 50%, and the titanium bag content is 1 to 10%,
Optionally, the mass ratio of the silica sol, aluminum hydroxide and titanium bag is in the range of 40 to 80: 15 to 50: 1 to 10, and the optimal mass ratio is 10: 3: 0.5 Sintering accelerator for producing silica stone bricks . According to claim 1 or 2,
Optionally, the silica sol comprises nanoscale silica colloidal particles;
Sintering accelerator for producing silica stone bricks, characterized in that the solid content of the silica sol is 20 to 30%. According to claim 1,
The sintering accelerator is a sintering accelerator for producing silica stone bricks, characterized in that for producing silica stone bricks. Mixing and co-milling silica sol, aluminum hydroxide, and titanium bag,
Optionally, the co-milling time is greater than or equal to 2 hours;
Optionally, the silica sol comprises nano silica colloidal particles;
Optionally, in the sintering accelerator, the silica sol content is 40 to 80%, the aluminum hydroxide content is 15 to 50%, and the titanium bag content is 1 to 10%,
Optionally, the mass ratio of the silica sol, aluminum hydroxide and titanium bag is 10:3:0.5,
Optionally, the solid content of the silica sol is 20 to 30%,
Optionally, the sintering accelerator is a method for producing a sintering accelerator for producing a silica stone brick, characterized in that for producing a silica stone brick. A silica stone brick comprising a silicon-containing material and a sintering accelerator according to any one of claims 1 to 5. According to claim 6,
The silicon-containing material includes fused quartz and quartzite fine powder;
Optionally, the silicon-containing material comprises fused quartz aggregate, fused quartz fine powder and quartzite fine powder;
The fused quartz aggregate has a silica content of 96% or more, a silica content in an amorphous form of 85% or more, a critical particle size of 3 mm, a percentage content of 40-55% with a particle size of 3 to 1 mm, and a particle size of 1 to 0.5 mm. The percentage content is 21-38%, the particle size is 0.5-0 mm, the percentage content is 21-38%, the particle size of the fused quartz fine powder is 0.088 mm or less, and the silica content is 90% or more; The particle size of the quartz rock fine powder is 0.088 mm or less, the silica content is 90% or more,
Optionally, a silica stone brick further comprising sodium carboxymethylcellulose. According to claim 7,
The silica stone brick comprises 45 to 65 parts of fused quartz aggregate, 10 to 35 parts of fused quartz fine powder, 10 to 30 parts of quartz rock fine powder, 3 to 6 parts of sintering accelerator, and 0 to 0.5 parts of sodium carboxymethylcellulose. Silica stone bricks made of. Step 1) to obtain a mixture material to be molded by stirring the fused quartz aggregate, continuously adding and stirring a sintering accelerator, and then adding and stirring the fused quartz fine powder and quartz rock fine powder;
Step 2) of compressing and molding the mixture obtained in step 1) into a base having a desired shape; and
The method for manufacturing a silica stone brick according to any one of claims 6 to 8, comprising a step 3) of drying and sintering the molding base of step 2). According to claim 9,
Optionally, in step 1), the stirring is performed in a mixer mill,
Optionally, in step 1), the fused quartz aggregate is put into a mixer mill and stirred for 1 to 3 minutes, a sinter accelerator is added and stirred for 1 to 3 minutes, and fused quartz fine powder and quartz rock fine powder are added and stirred for 15 to 20 minutes. Stir for 1 minute,
Optionally, the total stirring time in step 1) is 20 minutes or more,
Optionally, in step 1), the mixer mill is a planetary mixer mill or a forced mixer,
Optionally, in step 1), 45 to 65 parts of fused quartz aggregate, 10 to 35 parts of fused quartz fine powder, 10 to 30 parts of fine quartz rock powder, 3 to 6 parts of sintering accelerator, and 0 to 0.5 parts of sodium carboxymethylcellulose are added. mix,
Optionally, in step 2), the molding pressure during compression molding is 300 tons or more,
Optionally, it is molded by a molding press in step 2),
Optionally, the molding press is a friction press, an electric program control press or a hydraulic press with a tonnage of 300 tons or more,
Optionally, in step 3), the molding material of step 2) is dried in an environment of 120 ° C or less for 20 hours or more, put in a calcining kiln and sintered at a heating rate of 35 ° C / hour or less,
Optionally, the firing kiln in step 3) is an electric heating type or gas type shuttle kiln,
Optionally, the method for producing a silica stone brick, characterized in that the sintering temperature in step 3) is 800 ~ 1050 ℃.