CN114773040B

CN114773040B - Sliding plate brick and production method thereof

Info

Publication number: CN114773040B
Application number: CN202210264880.8A
Authority: CN
Inventors: 王新存
Original assignee: Tangshan Xinya Refractory Material Co ltd
Current assignee: Tangshan Xinya Refractory Material Co ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2023-01-13
Anticipated expiration: 2042-03-17
Also published as: CN114773040A

Abstract

The application relates to the technical field of refractory materials, and particularly discloses a sliding plate brick and a production method thereof. A slide plate brick comprises a working fabric in direct contact with molten steel, wherein the working fabric is composed of raw materials such as granular materials, fine powder materials and a bonding agent, and the preparation method comprises the following steps: a1, weighing the granular materials, the fine powder materials and the binding agent according to a proportion for later use; a2, firstly, stirring and mixing the granular material and the binding agent for 8-12 minutes to obtain the granular material wrapped with the binding agent; and A3, adding the fine powder into the particle materials coated with the binding agent, and mixing for 12-18 minutes to obtain a mixture, wherein the mixture is in a fine powder-binding agent-particle material coating structure from outside to inside in sequence. The sliding plate brick can be used for a ladle sliding nozzle system and has the advantages of strong erosion resistance and long service life.

Description

Sliding plate brick and production method thereof

Technical Field

The application relates to the technical field of refractory materials, in particular to a sliding plate brick and a production method thereof.

Background

With the rapid development of the steel industry, most ladles and tundishes are equipped with sliding gate nozzle systems, and the slide plate brick is a key component of the sliding gate nozzle system and is also a part determining the function of the sliding gate nozzle.

When the slide plate brick is applied to a large steel ladle with a violent reaction, particularly the steel ladle of a vanadium-titanium steel product has the characteristics of violent reaction and strong corrosivity, and when the slide plate brick is used for steel casting, the slide plate brick needs to bear the chemical erosion and the physical scouring of high-temperature molten steel with the temperature of more than 1500 ℃ for a long time, so that the slide plate brick is subjected to violent thermal shock and mechanical abrasion, and the use condition is very harsh.

At present, the production method of the related steel ladle slide plate brick comprises the following steps: weighing production raw materials and a binding agent according to a certain proportion, uniformly mixing, pressing after mixing to obtain a semi-finished brick blank, drying the brick blank, and firing at the high temperature of 1400-1800 ℃ to obtain the finished slide plate brick.

When the related sliding plate brick is used for bearing the steel casting work of molten steel with violent reaction and strong corrosivity, the surface of the sliding plate brick is corroded and washed after the steel casting work of the vanadium-titanium steel variety molten steel is finished every time, so that the reaming on the sliding plate brick is obviously increased, the corroded situation is easy to occur, the sliding plate brick needs to be replaced in time, and the service life is short.

Disclosure of Invention

In order to prolong the service life of the sliding plate brick, the application provides the sliding plate brick and a production method thereof.

In a first aspect, the present application provides a slide plate brick, which adopts the following technical scheme:

a sliding plate brick comprises a working fabric in direct contact with molten steel, wherein the working fabric is composed of a granular material, a fine powder material and a binding agent, and the weight ratio of the granular material to the fine powder material to the binding agent in the working fabric is (8-12): (4-7): 1;

the granules in the working fabric comprise

70-80 parts of sintered corundum with the granularity of 3-1 mm;

100-140 parts of sintered corundum with the granularity of 2-1 mm;

100-140 parts of sintered corundum with the granularity of 1-0.5 mm;

50-80 parts of sintered corundum with the granularity of 0-0.5 mm;

20-50 parts of silicon carbide with the granularity of 0-0.5 mm;

the fine powder in the working fabric comprises 90-100 parts of sintered corundum, 15-25 parts of activated alumina micro powder, 30-40 parts of metal aluminum powder, 8-20 parts of metal silicon powder, 4-10 parts of graphite, 1-10 parts of boron carbide, 10-20 parts of magnesia-alumina spinel, 4-10 parts of carbon black and 5-15 parts of zirconia;

the binding agent comprises 2-7 parts of phenolic resin and 1-5 parts of organic silicon resin.

Through adopting above-mentioned technical scheme, play the effect of bonding granule material and fine powder material through the binder, make the inseparable combination between granule material and the fine powder material, fine powder material can be to the effective packing of the hole between the granule material, improve the density of pressing into of slide block brick, thereby the erosion resistance of slide block brick has been guaranteed, simultaneously because the zirconia of adding in the fine powder material, good erosion resistance has, and mix jointly with other raw materials in the fine powder material and make the slide block brick of making have high temperature resistant, anti-corrosion, resistant erode and anti-oxidant effect, the life of slide block brick has been prolonged.

Preferably, the granules in the working fabric comprise

71-75 parts of sintered corundum with the granularity of 3-1 mm;

110-130 parts of sintered corundum with the granularity of 2-1 mm;

110-130 parts of sintered corundum with the granularity of 1-0.5 mm;

55-65 parts of sintered corundum with the granularity of 0-0.5 mm;

25-35 parts of silicon carbide with the granularity of 0-0.5 mm;

the fine powder in the working fabric comprises 93-96 parts of sintered corundum, 16-20 parts of active alumina micropowder, 35-38 parts of metal aluminum powder, 10-15 parts of metal silicon powder, 5-8 parts of graphite, 2-6 parts of boron carbide, 11-15 parts of magnesia-alumina spinel, 5-8 parts of carbon black and 6-11 parts of zirconia;

the binding agent comprises 3-6 parts of phenolic resin and 2-4 parts of organic silicon resin.

By adopting the technical scheme, the fine powder and the granular material are combined more tightly by optimizing the dosage ratio of the granular material to the fine powder in the working fabric, so that the pressing density of the sliding plate brick is increased, the corrosion of molten steel to the sliding plate brick is better borne, and the service life of the sliding plate brick is prolonged.

Preferably, the fine powder of the working fabric further comprises 8-15 parts of modified diatomite, and the modified diatomite is prepared by the following steps:

firstly, putting untreated diatomite into a hydrochloric acid solution, oscillating in a constant-temperature water bath, washing to be neutral, filtering, and drying to obtain pretreated diatomite; soaking pretreated diatomite with a dispersing agent, and then draining to obtain modified diatomite;

the dispersing agent comprises 5-10 parts of ethanol and 5-10 parts of ethylene glycol.

By adopting the technical scheme, after the diatomite is modified by the hydrochloric acid, the particle surface is rougher, more grooves and cavities are formed, the specific surface area and the pore volume are increased, the adsorption capacity is enhanced, and more dispersing agents can be adsorbed; the diatomite soaked by the dispersing agent can be better dispersed in fine powder, and the agglomeration is reduced.

When the sliding plate brick added with the modified diatomite is put into use, the sliding plate brick can contact molten steel with the temperature of more than 1500 ℃, the main component of the diatomite is amorphous silicon dioxide, when the sliding plate brick contacts the high-temperature molten steel, the amorphous silicon dioxide can be converted into crystal silicon dioxide and expands along with the volume, the zirconium dioxide can be converted into a tetragonal crystal form from a monoclinic crystal form at high temperature and shrinks along with the volume, the shrinkage force of the zirconium dioxide at high temperature is resisted by the addition of the diatomite, the phenomenon that the sliding plate brick is corroded by the molten steel to form pits is further reduced, and the service life of the sliding plate brick is prolonged;

in the pressing process, the pore structure of the modified diatomite is crushed more easily, so that alcohol substances adsorbed by the diatomite are volatilized easily in the drying and heating process, water in the slide plate brick is taken away, the drying time is shortened, the combination among particles is ensured to be tighter, the erosion resistance of the slide plate brick is enhanced, and the service life is prolonged.

Ethanol and glycol are adopted as dispersing agents for compound use, on one hand, the ethanol and the glycol can be mutually dissolved and are convenient to disperse; the ethanol is easy to volatilize, and the ethanol is prevented from volatilizing after the ethylene glycol and the ethanol are mutually dissolved, so that the surface of the modified diatomite soaked by the ethanol and the ethylene glycol is provided with a large number of hydroxyl groups, the friction force between the diatomite and other powder particles is reduced, the fluidity of fine powder is enhanced, the fine powder can be better filled in gaps among the particles, the diatomite and the particles are further tightly combined, the compaction density of the sliding brick is enhanced, and the erosion resistance is improved; on the other hand, the surface of the diatomite can be ensured to carry a large amount of hydroxyl to be combined with active groups on the binding agent, and the binding agent bonds the diatomite with granules with larger granularity, so that the bonding property of the diatomite and other raw materials is improved, and the manufactured slide plate brick has good erosion resistance and corrosion resistance.

Preferably, the sliding brick further comprises a non-working fabric, wherein the non-working fabric is composed of particles, fine powder and a binding agent, and the weight ratio of the particles, the fine powder and the binding agent in the non-working fabric is (6-8): (3-5): 1;

the particle materials in the non-working fabric comprise

70-80 parts of high-aluminum material with the granularity of 3-1 mm;

100-140 parts of high-alumina material with the granularity of 1-0 mm;

the fine powder in the non-working fabric comprises 70-80 parts of high-aluminum material, 10-20 parts of white mud and 10-20 parts of graphite;

the binding agent in the non-working fabric is 4-6 parts of phenolic resin.

By adopting the technical scheme, as the non-working fabric is not in direct contact with the molten steel, the non-working fabric mainly made of high-aluminum materials is adopted, the cost of the sliding plate brick can be effectively reduced, and the anti-corrosion effect of the sliding plate brick is ensured.

Preferably, the usage ratio of the working fabric to the non-working fabric is 3: (5-8).

By adopting the technical scheme, the non-working fabric and the working fabric in the sliding plate brick are added according to the proportion, so that the cost can be saved while the corrosion effect is improved, the working fabric and the non-working fabric take values in the range, and the corrosion resistance effect of the manufactured sliding plate brick is in an expected range.

In a second aspect, the present application provides a method for producing a slide plate brick, which adopts the following technical scheme:

a method for producing a slide brick comprises the following steps:

s1, putting a round bar for determining the aperture size of a sliding plate brick into a sliding plate brick mold in advance;

s2, pouring the mixed working fabric into a sliding plate brick mold, and drawing out the round bar after the mixed working fabric is laid flat;

s3, pressing, demolding, drying and polishing the working fabric in the mold to obtain a finished sliding plate brick;

the drying conditions are heat preservation at 0-60 ℃ for 1-4 hours, at 60-90 ℃ for 2-6 hours, at 90-120 ℃ for 5-12 hours, and at 200 ℃ for 3-8 hours.

By adopting the technical scheme, because the granular materials and the fine powder are easy to absorb moisture in the air in summer or in an environment with higher humidity, the bonding effect after pressing is poor, the pressed sliding plate brick needs to be dried, the moisture in the sliding plate brick is volatilized in the drying process, the bonding effect among particles is better, and the sliding plate brick can be fully dried only by prolonging the drying time due to good pressing density; under the drying condition, the moisture in the manufactured slide plate brick can be fully dried, so that the raw material particles are combined more tightly, and the corrosion resistance is stronger.

A method of producing the slide plate brick described above, comprising the steps of:

s1, putting a round bar for determining the aperture size of a sliding plate brick into a sliding plate brick mold in advance, and then sleeving a cylinder on the outer side of the round bar coaxially, wherein the radius difference between the cylinder and the round bar is not less than 2cm;

s2, pouring the mixed non-working fabric into a skateboard die, wherein the mixed non-working fabric cannot be poured into a cylinder, pouring the working fabric into the cylinder and the die after the mixed non-working fabric is paved, and then pulling out the cylinder to enable the working fabric to be paved on the non-working fabric;

and S3, after the tile is laid flat, pressing, demolding, drying and polishing are carried out to obtain the finished sliding plate brick.

By adopting the technical scheme, when the slide plate brick formed by sintering is used, a large number of holes caused by sintering exist on the surface, the sintered slide plate brick is often required to be impregnated, the surface of the impregnated sintered slide plate brick can generate a large amount of toxic and harmful gas when meeting high-temperature molten steel, and the gas is easy to be eroded by strong scouring of the molten steel, so that the slide plate brick is poor in environmental protection and short in service life. Therefore, the granular material, the fine powder and the binding agent are pressed and formed without sintering, and the environment-friendly effect is achieved.

The non-working fabric and the working fabric are pressed by the method and then tightly combined together for forming, the bonding agent is solidified when the pressed sliding plate brick is dried and heated, the working fabric and the non-working fabric are bonded, so that the pressed sliding plate brick has good erosion resistance, the positions of the molten steel contacting the sliding plate brick are both the working fabric, the cost of the non-working fabric is reduced, the sliding plate brick is guaranteed to have good erosion resistance and pressing density, the sliding plate brick can bear the scouring of the molten steel, and the service life of the sliding plate brick is prolonged.

Preferably, the drying conditions in S3 are heat preservation at 0-60 ℃ for 1-2 hours, at 60-90 ℃ for 2-3 hours, at 90-120 ℃ for 5-6 hours, and at 200 ℃ for 3-4 hours.

By adopting the technical scheme, the slide plate brick produced in the drying time can realize the complete drying effect, and compared with the slide plate brick produced without adding modified diatomite, the slide plate brick has shorter drying time, improves the production efficiency of the slide plate brick, and can ensure that the produced slide plate brick has good anti-corrosion effect.

Preferably, the working fabric or the non-working fabric is prepared by the following steps:

a1, weighing the granular materials, the fine powder materials and the binding agent according to a proportion for later use;

a2, firstly stirring and mixing the granular material and the binding agent for 8-12 minutes to obtain the granular material wrapped with the binding agent;

and A3, adding the fine powder into the granular materials coated with the binding agent for mixing for 12-18 minutes to obtain a mixture, wherein the mixture sequentially has a coating structure of fine powder, binding agent and granular materials from outside to inside.

Through adopting above-mentioned technical scheme, carry out the premix with the binder with the granule earlier, make the even one deck binder that wraps up in surface of granule material, then mix adding fine powder, make the binder of parcel in the granule material outside wrap up the one deck fine powder again, the mixture that obtains like this has special parcel structure, during the press forming, the combination between the granule can be inseparabler, the density is pressed into of the slide plate brick of presswork is bigger, erosion resistance is stronger, and helps improving the life of slide plate brick.

In summary, the present application has the following beneficial effects:

1. the application adopts the granular materials, the fine powder materials and the binding agent to be formed by pressing, and sintering is not carried out, so that the environment-friendly effect is achieved; and the bonding agent plays a role in bonding the granular materials and the fine powder materials, so that the granular materials and the fine powder materials are tightly combined, the fine powder materials can effectively fill the pores between the granular materials, and the pressing density of the sliding plate brick is improved, thereby ensuring the anti-erosion performance of the sliding plate brick.

2. Modified diatomite is preferably adopted in the application, and after the diatomite is modified by hydrochloric acid, the particle surface is rougher, more grooves and cavities are formed, the specific surface area and the pore volume are increased, and the adsorption capacity is enhanced, so that the diatomite and other fine powder materials are combined more tightly; the diatomite soaked by the dispersing agent can be better dispersed in fine powder, and the agglomeration is reduced.

3. The method mixes the granular materials with the binding agent, so that the surface of the granular materials is uniformly wrapped with one layer of binding agent, fine powder is added to mix, the binding agent wrapped outside the granular materials is wrapped with one layer of fine powder, the mixture obtained in the way has a special wrapping structure, and during compression molding, the combination among particles can be tighter, the pressed density of the pressed sliding plate brick is higher, the erosion resistance is higher, and the service life of the sliding plate brick is prolonged.

Detailed Description

The present application will be described in further detail with reference to examples.

The raw material sources are as follows:

the physical and chemical indexes of the active alumina micro powder are as follows:

index (es)	Require to make a request for
		Al ² O ³ (％)	≥98.5
Fe ² O ³ (％)	≤0.1
		Loss due to ignition (%)	≤0.5

Preparation examples

Preparation A1

A working lining of a sliding brick comprises granular materials, fine powder materials and a bonding agent,

the granule material in the working fabric comprises

70kg of sintered corundum with the granularity of 3-1 mm;

100kg of sintered corundum with the granularity of 2-1 mm;

100kg of sintered corundum with the granularity of 1-0.5 mm;

50kg of sintered corundum with the granularity of 0-0.5 mm;

20kg of silicon carbide with the granularity of 0-0.5 mm;

the fine powder in the working fabric comprises 90kg of sintered corundum, 15kg of active alumina micropowder, 30kg of metal aluminum powder, 8kg of metal silicon powder, 4kg of graphite, 1kg of boron carbide, 10kg of magnesia-alumina spinel, 4kg of carbon black and 5kg of zirconia;

the binding agent comprises 7kg of phenolic resin and 1kg of organic silicon resin;

the grain sizes of the fine powder materials are 325 meshes;

the preparation method comprises the following steps: a1, weighing the granular materials, the fine powder materials and the binding agent according to a proportion for later use;

a2, firstly stirring and mixing the granular materials and the binding agent for 15 minutes to obtain the granular materials wrapped with the binding agent;

and A3, adding the fine powder into the particle materials coated with the binding agent, and mixing for 15 minutes to obtain a mixture, wherein the mixture is in a fine powder-binding agent-particle material coating structure from outside to inside in sequence.

Preparation example A2

Based on the preparation example A1, the working fabric of the slide brick comprises granules

71kg of sintered corundum with the granularity of 3-1 mm;

110kg of sintered corundum with the granularity of 2-1 mm;

110kg of sintered corundum with the granularity of 1-0.5 mm;

55kg of sintered corundum with the granularity of 0-0.5 mm;

25kg of silicon carbide with the granularity of 0-0.5 mm;

the fine powder in the working fabric comprises 93kg of sintered corundum, 16kg of active alumina micropowder, 35kg of metal aluminum powder, 10kg of metal silicon powder, 5kg of graphite, 2kg of boron carbide, 11kg of magnesium aluminate spinel, 5kg of carbon black and 6kg of zirconia;

the binding agent comprises 3kg of phenolic resin and 2kg of organic silicon resin;

the procedure was the same as in preparation A1.

Preparation example A3

Based on the preparation example A1, the working fabric of the slide plate brick comprises granules

73kg of sintered corundum with the granularity of 3-1 mm;

120kg of sintered corundum with the granularity of 2-1 mm;

120kg of sintered corundum with the granularity of 1-0.5 mm;

60kg of sintered corundum with the granularity of 0-0.5 mm;

30kg of silicon carbide with the granularity of 0-0.5 mm;

the fine powder in the working fabric comprises 95kg of sintered corundum, 18kg of active alumina micropowder, 36kg of metal aluminum powder, 12kg of metal silicon powder, 6kg of graphite, 5kg of boron carbide, 13kg of magnesium aluminate spinel, 7kg of carbon black and 10kg of zirconia;

the binding agent comprises 4kg of phenolic resin and 3kg of organic silicon resin;

the procedure was the same as in preparation A1.

Preparation example A4

75kg of sintered corundum with the granularity of 3-1 mm;

130kg of sintered corundum with the granularity of 2-1 mm;

130kg of sintered corundum with the granularity of 1-0.5 mm;

65kg of sintered corundum with the granularity of 0-0.5 mm;

35kg of silicon carbide with the granularity of 0-0.5 mm;

the fine powder in the working fabric comprises 96kg of sintered corundum, 20kg of active alumina micro powder, 38kg of metal aluminum powder, 15kg of metal silicon powder, 8kg of graphite, 6kg of boron carbide, 15kg of magnesium aluminate spinel, 8kg of carbon black and 11kg of zirconia.

The binding agent comprises 6kg of phenolic resin and 4kg of organic silicon resin;

the procedure was the same as in preparation A1.

Preparation example A5

80kg of sintered corundum with the granularity of 3-1 mm;

140kg of sintered corundum with the granularity of 2-1 mm;

140kg of sintered corundum with the granularity of 1-0.5 mm;

80kg of sintered corundum with the granularity of 0-0.5 mm;

50kg of silicon carbide with the granularity of 0-0.5 mm;

the fine powder in the working fabric comprises 100kg of sintered corundum, 25kg of active alumina micropowder, 40kg of metal aluminum powder, 20kg of metal silicon powder, 10kg of graphite, 10kg of boron carbide, 20kg of magnesia-alumina spinel, 10kg of carbon black and 15kg of zirconia;

the binding agent comprises 7kg of phenolic resin and 5kg of organic silicon resin;

the procedure was the same as in preparation A1.

Preparation example A6

A working fabric of a sliding plate brick is prepared by adding 8kg of modified diatomite into fine powder based on preparation example A3, wherein the modified diatomite is prepared by the following steps:

firstly, putting untreated diatomite into 12mol/L hydrochloric acid solution, wherein the dosage ratio of the diatomite to the hydrochloric acid is 1; soaking pretreated diatomite with a dispersing agent, wherein the dosage ratio of the dispersing agent to the pretreated diatomite is 3;

wherein the dispersant comprises 5kg of ethanol and 5kg of glycol.

Preparation example A7

The difference between the working fabric of the sliding brick and the preparation example A6 is that 11kg of modified diatomite is added into the fine powder, and the dispersing agent comprises 8 parts of ethanol and 9 parts of ethylene glycol.

Preparation example A8

The difference between the working fabric of the sliding brick and the preparation example A6 is that 15kg of modified diatomite is added into the fine powder, and the dispersing agent comprises 10 parts of ethanol and 10 parts of ethylene glycol.

Preparation example B1

A non-working fabric of a sliding brick comprises granular materials, fine powder materials and a bonding agent;

the granules in the non-working fabric comprise

75kg of high-alumina material with the granularity of 3-1 mm;

120kg of high-alumina material with the granularity of 1-0 mm;

the fine powder in the non-working fabric comprises 75kg of high-aluminum material, 15kg of white mud and 15kg of graphite;

the bonding agent comprises 5kg of phenolic resin;

the grain sizes of the fine powder materials are 325 meshes;

the preparation method comprises the following steps:

and A3, adding the fine powder into the granular materials wrapped with the binding agent, and mixing for 15 minutes to obtain a mixture, wherein the mixture sequentially has a wrapping structure of fine powder, the binding agent and the granular materials from outside to inside.

Preparation example B2

the granules in the non-working fabric comprise

70kg of high-alumina material with the granularity of 3-1 mm;

100kg of high-alumina material with the granularity of 1-0 mm;

the fine powder in the non-working fabric comprises 70kg of high-aluminum material, 10kg of white mud and 10kg of graphite;

the binder comprises 4kg of phenolic resin.

Preparation B3

A non-working fabric of a sliding brick is composed of granular materials, fine powder materials and a bonding agent;

the granules in the non-working fabric comprise

80kg of high-alumina material with the granularity of 3-1 mm;

140kg of high-alumina material with the granularity of 1-0 mm;

the fine powder in the non-working fabric comprises 80kg of high-aluminum material, 20kg of white mud and 20kg of graphite;

the binder comprises 6kg of phenolic resin.

Comparative preparation example A1

The difference between the working fabric of the sliding brick and the preparation example A1 is that zirconia is not added into the fine powder in the working fabric.

Comparative preparation example A2

A working fabric of a slide brick is based on preparation example A7, and modified diatomite is not pretreated by a hydrochloric acid solution.

Comparative preparation example A3

A working fabric of a slide plate brick is prepared by soaking modified diatomite in a dispersing agent compounded by ethanol and glycol on the basis of preparation example A7.

Comparative preparation example A4

A working fabric of a sliding brick is based on preparation example A7, and ethanol is not added into a dispersing agent used for modifying diatomite.

Comparative preparation example A5

A working fabric of a slide brick is prepared on the basis of preparation example A7, and ethylene glycol is not added into a dispersing agent used for modifying diatomite.

Comparative preparation example A6

A working fabric of a sliding brick is based on preparation example A7, and propylene glycol is used as a dispersing agent for modified diatomite.

Comparative preparation example A7

A working fabric of a sliding brick is prepared by directly and jointly mixing granular materials, fine powder materials and a binding agent on the basis of preparation example A1.

Comparative preparation example B1

A non-working fabric for a slide plate brick is prepared by directly and jointly mixing a granular material, a fine powder material and a binding agent on the basis of preparation example B1.

Examples

Examples 1 to 8

A sliding plate brick comprises a working fabric which is prepared from preparation examples A1-A8 in sequence.

A method of producing a slide plate brick comprising the steps of:

s2, pouring the mixed working fabric into a sliding plate brick mold, and drawing out a round bar after the mixed working fabric is laid flat;

and S3, pressing the working fabric in the die for 5 times by using a jack press, demolding, drying and polishing to obtain the finished sliding plate brick.

The mixed working fabric in the S2 is prepared by the following steps:

a3, adding the fine powder into the particle materials coated with the binding agent for mixing for 15 minutes to obtain a mixture, wherein the mixture is in a fine powder-binding agent-particle material coating structure from outside to inside in sequence;

the drying conditions in S3 are heat preservation at 0-60 ℃ for 1-2 hours, at 60-90 ℃ for 2-3 hours, at 90-120 ℃ for 5-6 hours, and at 200 ℃ for 3-4 hours.

Comparative example 1

A slide brick differing from example 1 in that the working face material thereof was prepared by comparative preparation example 1.

The slide tiles of examples 1-8 and comparative example 1 were tested.

The test comprises the following steps:

1. steel pouring test of slide plate brick

The slide brick working face materials of examples 1-8 and comparative example 1 were made into slide brick samples with the same size, respectively, and applied to a sliding gate nozzle system of a ladle, the steel type in the ladle was vanadium-titanium steel, the slide brick sample size was 410mm x 230mm x 45mm, wherein the thickness of the working face material was 20mm, the diameter of the pouring hole of the slide brick was 65mm, and the steel pouring time per ladle was 40min on average.

And 5 persons with normal eyesight are selected to form an evaluation group, after steel pouring is finished each time, each person measures the diameter of the pouring hole of the sliding plate brick in the embodiment 1-8, the measurement results of each person are averaged, and the diameters of the pouring holes in the embodiment 1-8 and the comparative example 1 are obtained respectively.

Calculating the reaming diameter difference of the sliding brick after each pouring, wherein the reaming diameter difference is = the diameter of the pouring hole after each pouring-the diameter of the initial pouring hole (65 mm)

When the difference value between the diameter of the pouring hole after pouring and the diameter of the initial pouring hole is larger than 15mm, the method is marked as a rejected sliding plate brick and is not suitable for being continuously used as a sliding plate brick of a ladle nozzle.

The test results are shown in Table 1.

TABLE 1 test results of the sliding brick of examples 1 to 8 and comparative example 1

As can be seen by combining examples 1 to 5 and table 1, the service life of the sliding plate brick of examples 1 to 5 can reach 3 times, which indicates that in the present application, the binder plays a role in binding the granular material and the fine powder material, so that the granular material and the fine powder material are tightly bound, the fine powder material can effectively fill the pores between the granular material, the pressing density of the sliding plate brick is improved, and the erosion resistance of the sliding plate brick is ensured; the fine powder and the granular materials are combined more tightly by optimizing the dosage proportion of the granular materials and the fine powder materials in the working fabric, so that the pressing density of the sliding plate brick is increased, the corrosion of molten steel to the sliding plate brick is better borne, and the service life of the sliding plate brick is prolonged; the difference in the counterbore diameter of example 3 is the smallest, and example 3 is explained as a preferred example.

As can be seen by combining examples 1-5 and comparative example 1, the service life of the sliding plate brick of examples 1-5 is better than that of comparative example 1, which shows that the sliding plate brick prepared by the method has the effects of high temperature resistance, erosion resistance, scouring resistance and oxidation resistance and prolongs the service life of the sliding plate brick due to the fact that the zirconia added into the fine powder has good erosion resistance and is mixed with other raw materials in the fine powder.

It can be seen from the combination of example 3 and examples 6 to 8 and table 1 that the number of times of use of the sliding plate brick of examples 6 to 8 can reach 4, and examples 6 to 8 are all superior to example 3, which indicates that the sliding plate brick added with the modified diatomite in the present application contacts with molten steel at a temperature of more than 1500 ℃ when put into use, the main component of the diatomite is amorphous silica, and when contacting with high-temperature molten steel, the amorphous silica is converted into crystalline silica accompanied by volume expansion, while the zirconia is converted from monoclinic form into tetragonal form at high temperature accompanied by volume contraction, and the addition of the diatomite resists the contraction force of the zirconia at high temperature, thereby reducing the phenomenon that the sliding plate brick is corroded by the molten steel, and prolonging the service life of the sliding plate brick. And example 7 is superior to examples 6 and 8, illustrating that example 7 is the preferred example.

Comparative examples 2 to 6

A slide brick differing from example 7 in that the working face material was obtained from comparative example preparations A2 to A6.

The performance test was performed for example 7 and comparative examples 2 to 6.

The test comprises the following steps:

2. performance test of sliding brick

The sliding brick produced in example 7 and comparative examples 2 to 6 were subjected to the tests of compressive strength and volume density by the methods specified in GB/T5072-2008 "test method for ordinary temperature compressive strength of refractory material" and GB/T2997-2015 "test method for bulk density, apparent porosity and true porosity of densely shaped refractory product".

The bonding strength of the formed sliding plate brick is reflected through the compressive strength, and the pressing density of the sliding plate brick is reflected through the volume density.

The test results are shown in Table 2.

TABLE 2 test results for slide tiles of example 7 and comparative examples 2 to 6

As can be seen by combining example 7 and comparative examples 2-6 and combining Table 2, example 7 is superior to comparative examples 2-6, and the modification of diatomite by hydrochloric acid in the application shows that the particle surface is rougher, more grooves and cavities are formed, the specific surface area and pore volume are larger, the adsorption capacity is enhanced, and more dispersants can be adsorbed; the diatomite soaked by the dispersing agent can be better dispersed in fine powder, and the agglomeration is reduced.

And in the pressing process, the pore structure of the modified diatomite is more easily crushed, so that alcohol substances adsorbed by the diatomite are easily volatilized in the drying and heating process, and water in the slide plate brick is taken away, so that the drying time is shortened, the combination among particles is more compact, the erosion resistance of the slide plate brick is enhanced, and the service life is prolonged.

On one hand, the ethanol and the glycol can be mutually dissolved and are convenient to disperse; the ethanol is easy to volatilize, and the ethanol is prevented from volatilizing after the ethylene glycol and the ethanol are mutually dissolved, so that the surface of the modified diatomite soaked by the ethanol and the ethylene glycol is provided with a large number of hydroxyl groups, the friction force between the diatomite and other powder particles is reduced, the fluidity of fine powder is enhanced, the fine powder can be better filled in gaps among the particles, the diatomite and the particles are further tightly combined, the compaction density of the sliding brick is enhanced, and the erosion resistance is improved; on the other hand, the diatomite surface can be ensured to carry a large amount of hydroxyl groups to be combined with active groups on the binding agent, and the binding agent then bonds the diatomite with granules with larger granularity, so that the bonding property of the diatomite and other raw materials is increased, and the manufactured slide plate brick has good erosion resistance and corrosion resistance.

Example 9

A sliding plate brick is based on embodiment 7, and further comprises a non-working fabric, wherein the weight ratio of the working fabric to the non-working fabric is 3;

the weight ratio of the granules, the fine powder and the binding agent in the working fabric is 10:5:1;

the weight ratio of the granules, the fine powder and the binding agent in the non-working fabric is 7:4:1;

a method of producing a slide brick comprising the steps of:

s1, putting a round rod for determining the aperture size of a sliding plate brick into a sliding plate brick mold in advance, and then sleeving a cylinder on the outer side of the round rod coaxially, wherein the radius difference between the cylinder and the round rod is not less than 2cm;

s2, pouring the mixed non-working fabric into a sliding plate brick mold, wherein the mixed non-working fabric cannot be poured into a cylinder, pouring the working fabric into the cylinder and the mold after the working fabric is paved, and then pulling out the cylinder to enable the working fabric to be paved on the non-working fabric;

s3, after the tile is laid flat, pressing for 5 times by using a jack press, demolding, drying and polishing to obtain a finished sliding plate brick;

wherein the non-working fabric in the step S2 is prepared from the preparation example B1;

the mixed non-working fabric is prepared by the following steps:

a2, firstly, stirring and mixing the granular material and the binding agent for 15 minutes to obtain the granular material wrapped with the binding agent;

Examples 10 to 11

A slide brick differing from example 9 in that a non-working face material was produced in the order of production examples B2 to B3.

The slide plate bricks of examples 9 to 11 were subjected to a steel casting test, and the test results are shown in Table 3.

TABLE 3 Experimental results for slide tiles of examples 9 to 11

By combining the embodiment 7 and the embodiments 9 to 11 and combining tables 1 and 3, it can be seen that the number of times of using the sliding brick of the embodiments 9 to 11 can reach 4 times, the embodiment 9 is better than the embodiments 10 to 11, the embodiment 9 is a better embodiment, and the reaming diameter difference of the embodiment 9 and the embodiment 7 is close, which indicates that in the present application, because the non-working facing material does not directly contact with the molten steel, the non-working facing material mainly made of high-aluminum material is adopted, the cost of the sliding brick can be effectively reduced, and the anti-erosion effect of the sliding brick is ensured.

Example 12

A sliding brick is different from that of example 3 in that the drying conditions are heat preservation at 0-60 ℃ for 2-3 hours, at 60-90 ℃ for 3-4 hours, at 90-120 ℃ for 7-8 hours, and at 200 ℃ for 5-6 hours.

Example 13

A slide brick differing from example 3 in that the drying conditions were heat-retention at a temperature of 0 to 60 ℃ for 3 to 4 hours, at a temperature of 60 to 90 ℃ for 5 to 6 hours, at a temperature of 90 to 120 ℃ for 9 to 12 hours, and at a temperature of 200 ℃ for 7 to 8 hours.

Example 14

A slide brick differing from example 7 in that the drying conditions were heat-retention at a temperature of 0 to 60 ℃ for 2 to 3 hours, heat-retention at a temperature of 60 to 90 ℃ for 3 to 4 hours, heat-retention at a temperature of 90 to 120 ℃ for 7 to 8 hours, and heat-retention at a temperature of 200 ℃ for 5 to 6 hours.

Example 15

A sliding brick is different from that of example 7 in that the drying conditions are heat preservation at 0-60 ℃ for 3-4 hours, 60-90 ℃ for 5-6 hours, 90-120 ℃ for 9-12 hours, and 200 ℃ for 7-8 hours.

The slide plate bricks of examples 12 to 15 and example 3 were subjected to a performance test

The test results are shown in Table 4.

Table 4 sliding plate brick test results of examples 12-15 and example 3

	Compressive strength/Mpa	Bulk density/g cm ^-3
			Example 3	170	4.8
Example 12	175	5.1
			Example 13	178	5.2
Example 7	235	5.4
			Example 14	236	5.5
Example 15	235	5.45

It can be seen by combining examples 3 and 12-13 with table 4 that the compressive strength and bulk density of example 13 are superior to those of examples 3 and 12, which shows that the drying effect of the slide plate brick is increased with the increase of the drying time, so that the inter-particle bonding force of the slide plate brick is stronger, the compressive strength is better, and the anti-corrosion performance of the slide plate brick is enhanced.

It can be seen from the combination of example 7 and examples 14-15 and table 4 that the compressive strength and bulk density of the slide brick do not change significantly with the extension of the drying time, which indicates that the addition of the modified diatomite shortens the drying time of the slide brick and ensures the slide brick to have good erosion resistance, because the pore structure of the added modified diatomite is more easily crushed during the pressing process, so that the alcohol substances adsorbed by the diatomite are easily volatilized during the drying and temperature rising process and take away the moisture in the slide brick, thereby shortening the drying time, ensuring that the bonding between the particles is tighter, enhancing the erosion resistance of the slide brick and prolonging the service life.

Comparative example 7

A slide brick differing from example 7 in that the working face fabric was prepared from comparative example preparation A7 and the non-working face fabric was prepared from comparative example preparation B1.

The performance of the slide plate brick of comparative example 7 was tested, and the test results are shown in table 5.

Table 5 results of performance test of comparative example 7

	Compressive strength/Mpa	Bulk density/g.cm ^-3
			Comparative example 7	193	5.2
Example 7	235	5.4

It can be seen from the combination of comparative example 7 and the combination of table 5 that example 7 is superior to comparative example 7, which indicates that in the present application, the particulate material and the binder are premixed to uniformly coat a layer of binder on the surface of the particulate material, and then fine powder is added to mix, so that the binder coated on the outer side of the particulate material is coated with a layer of fine powder, and the mixture obtained in this way has a special coating structure, during compression molding, the bonding between particles can be tighter, the pressed density of the pressed sliding plate brick is higher, the erosion resistance is stronger, and the service life of the sliding plate brick is improved.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The sliding plate brick is characterized by comprising a working fabric in direct contact with molten steel, wherein the working fabric is composed of a granular material, a fine powder material and a binding agent, and the weight ratio of the granular material to the fine powder material to the binding agent in the working fabric is (8-12): (4-7): 1;

the granules in the working fabric comprise

70-80 parts of sintered corundum with the granularity of 3-1 mm;

100-140 parts of sintered corundum with the granularity of 2-1 mm;

100-140 parts of sintered corundum with the granularity of 1-0.5 mm;

50-80 parts of sintered corundum with the granularity of 0-0.5 mm;

20-50 parts of silicon carbide with the granularity of 0-0.5 mm;

the fine powder in the working fabric comprises 90-100 parts of sintered corundum, 15-25 parts of active alumina micropowder, 30-40 parts of metal aluminum powder, 8-20 parts of metal silicon powder, 4-10 parts of graphite, 1-10 parts of boron carbide, 10-20 parts of magnesia-alumina spinel, 4-10 parts of carbon black and 5-15 parts of zirconia;

the binding agent comprises 2-7 parts of phenolic resin and 1-5 parts of organic silicon resin;

the fine powder of the working fabric further comprises 8-15 parts of modified diatomite, and the modified diatomite is prepared by the following steps:

the dispersing agent comprises 5-10 parts of ethanol and 5-10 parts of glycol.

2. The slide plate tile according to claim 1,

the particle materials in the working fabric comprise

71-75 parts of sintered corundum with the granularity of 3-1 mm;

110-130 parts of sintered corundum with the granularity of 2-1 mm;

110-130 parts of sintered corundum with the granularity of 1-0.5 mm;

55-65 parts of sintered corundum with the granularity of 0-0.5 mm;

25-35 parts of silicon carbide with the granularity of 0-0.5 mm;

the fine powder in the working fabric comprises 93-96 parts of sintered corundum, 16-20 parts of activated alumina micro powder, 35-38 parts of metal aluminum powder, 10-15 parts of metal silicon powder, 5-8 parts of graphite, 2-6 parts of boron carbide, 11-15 parts of magnesia-alumina spinel, 5-8 parts of carbon black and 6-11 parts of zirconia;

3. A slide brick as claimed in claim 1, wherein: the sliding plate brick further comprises a non-working fabric, wherein the non-working fabric is composed of a granular material, a fine powder material and a binding agent, and the weight ratio of the granular material to the fine powder material to the binding agent in the non-working fabric is (6-8): (3-5): 1;

the granules in the non-working fabric comprise

70-80 parts of high-aluminum material with the granularity of 3-1 mm;

100-140 parts of high-alumina material with the granularity of 1-0 mm;

the binding agent in the non-working fabric is 4-6 parts of phenolic resin.

4. The slide plate brick of claim 3 wherein: the weight ratio of the working fabric to the non-working fabric is 3:7.

5. a method of producing a slide brick according to any one of claims 1 and 2, characterized in that: the method comprises the following steps:

the drying conditions are heat preservation for 1-4 hours at the temperature of 0-60 ℃, heat preservation for 2-6 hours at the temperature of 60-90 ℃, heat preservation for 5-12 hours at the temperature of 90-120 ℃ and heat preservation for 3-8 hours at the temperature of 200 ℃.

6. A method of producing the slide brick of claim 3, characterized by: the method comprises the following steps:

and S3, after the tile is laid, pressing, demolding, drying and polishing are carried out to obtain the finished sliding plate brick.

7. The method for producing a slide plate brick according to claim 6, wherein:

the drying conditions in S3 are heat preservation for 1-4 hours at the temperature of 0-60 ℃, heat preservation for 2-6 hours at the temperature of 60-90 ℃, heat preservation for 5-12 hours at the temperature of 90-120 ℃ and heat preservation for 3-8 hours at the temperature of 200 ℃.

8. The method for producing a slide brick according to any one of claims 5 to 6, wherein: the working fabric or the non-working fabric is prepared by the following steps: