CN114988855A

CN114988855A - Converter slag-blocking non-fired and non-dipped composite sliding plate brick and preparation method thereof

Info

Publication number: CN114988855A
Application number: CN202210514122.7A
Authority: CN
Inventors: 朱新军; 黄晨; 唐安山; 曾立民; 刘利华
Original assignee: Hunan Xianggang Ruitai Technology Co ltd
Current assignee: Hunan Xianggang Ruitai Technology Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-09-02
Anticipated expiration: 2042-05-12
Also published as: CN114988855B

Abstract

The invention provides a converter slag-stopping baking-free soaking-free composite sliding plate brick and a preparation method thereof. The invention provides a converter slag-stopping non-fired non-impregnated composite slide plate brick, which adopts plate-shaped corundum particles and silicon carbide particles as aggregates, adopts plate-shaped corundum powder, calcined alumina micro powder, aluminum powder, ferrosilicon nitride powder, bentonite, carbon black and boron carbide powder to prepare fine powder in a certain proportion, and adds aluminum fiber and composite resin binder (organic silicon resin and phenolic resin), wherein the materials are in different particle grades and are matched in a certain proportion to prepare a surface layer raw material. GaL88 high-alumina particles are used as aggregate, GaL88 high-alumina powder, aluminum powder, alumina micropowder, bonding clay and asphalt powder are matched to form fine powder, organic resin bonding agent is added, the materials are in different particle grades, and are matched according to a certain proportion to form a bottom layer raw material. Through the matching of the materials, the strength, erosion and scouring resistance, oxidation resistance, thermal shock resistance and usability of the material can be effectively improved.

Description

Converter slag-blocking baking-free soaking-free composite sliding plate brick and preparation method thereof

Technical Field

The invention relates to the field of refractory materials for steel smelting, in particular to a converter slag-stopping baking-free soaking-free composite sliding plate brick and a preparation method thereof.

Background

Modern steel is a basic industry in modern industry and is also an important guarantee for industrial development. Each process is very complicated from blast furnace tapping, converter steelmaking, refining to continuous casting, and is related to the final quality of steel finished products.

Wherein, the steel slag generated in the converter steel making is harmful when entering the next working procedure: affect the life of ladle refractories; resulfurization and rephosphorization of molten steel are caused, and the quality of the molten steel is influenced; the consumption of ferroalloy after the furnace is increased; the consumption of the synthetic slag in the next procedure is increased; the treatment time of the refining process is prolonged. The converter slag includes three parts: early-stage slag, vortex effect slag in the tapping process and later-stage slag. The slag stopping method commonly adopted in converter tapping at home and abroad at present is as follows: the early-stage slag adopts a slag stopping cap, and the later-stage slag adopts a slag stopping ball or a slag stopping plug. In addition, the pneumatic slag stopping and infrared slag stopping detection methods are also gradually applied to the slag stopping control of converter tapping, but the slag stopping methods cannot realize slag stopping in the whole process before and after converter tapping, particularly can hardly control early-stage slag, and the sliding plate slag stopping can well solve the problems. The sliding plate for slag blocking is characterized in that an oil cylinder pulls two sliding plate bricks of a sliding mechanism to slide relatively, the sliding plate is driven to open and close to adjust the flow of molten steel, and the slag falling amount is controlled to ensure the quality of the molten steel.

The converter steel tapping slide plate is subject to severe erosion and scouring of high-temperature molten steel and steel slag in the steel tapping process; in the frequent slag blocking operation process, the slide plate casting hole and the slide way are subjected to scouring erosion and diameter expansion of high-temperature molten steel and steel slag; in the smelting process, the cast hole is in a fully open state, and the sliding plate is directly impacted and oxidized by high-temperature flame; the discontinuous steel release causes the sliding plate to be subjected to high-temperature strong thermal shock impact above 1600 ℃. Therefore, the damage modes of the converter steel tapping sliding plate include erosion scouring and expanding of high-temperature molten steel and steel slag, impact oxidation of high-temperature flame, galling abrasion of a sliding surface, thermal shock cracks caused by frequent high-temperature and low-temperature conversion and the like. Therefore, the converter sliding plate material is required to have better comprehensive performances of erosion resistance, scouring resistance, oxidation resistance, thermal shock resistance and the like.

The converter slag-stopping sliding plate brick is generally made of re-burning and medium-temperature aluminum zirconium carbon or a composite structure of re-burning and medium-temperature aluminum zirconium carbon and embedding a zirconium plate and a zirconium ring on a body. The conventional re-fired aluminum zirconium carbon slag stopping sliding plate is subjected to high-temperature firing in a reducing atmosphere of more than 1400 ℃, pitch impregnation treatment is carried out, the firing and oil immersion costs are high, and the service life is generally 10-12 furnaces; the conventional intermediate-temperature aluminum zirconium carbon slag-blocking sliding plate is subjected to intermediate-temperature firing at 600-900 ℃ and pitch dipping treatment, so that the environmental pollution is great, and the service life is generally 12-15 furnaces; compared with the conventional reheating or medium temperature aluminum zirconium carbon sliding plate, the service life of the zirconium-embedded reheating or medium temperature aluminum zirconium carbon sliding plate is prolonged to a certain extent, but the production process complexity is greatly increased, the production cost is increased by 1-1.5 times, the potential safety hazard brought by the prolonging of the service life is increased, and more severe requirements are brought to field operators. Therefore, the research and development of the converter slag-stopping sliding plate brick with the comprehensive performances of erosion resistance, scouring resistance, oxidation resistance, thermal shock resistance and the like and high cost performance has very important significance for smelting clean steel and variety steel.

The publication No. CN 106630976A 'a gate valve slide plate brick for converter slag blocking and a preparation method thereof' discloses a slag blocking slide plate brick with improved safety performance, which is obtained by introducing zirconia alumina particles and fine powder with the weight exceeding that of plate-shaped corundum and a proper amount of expanded graphite into a formula on the basis of a re-fired alumina zirconia carbon slide plate, and has the advantages of long service life and substantially equivalent to that of a zirconium-embedded slide plate.

The publication No. CN 103864444A 'a novel sliding plate brick for an automatic slag blocking sliding gate of a converter and a preparation method thereof' discloses an aluminum-magnesium spinel carbonaceous heavy-burning slag blocking sliding plate brick, which improves the slag corrosion resistance of the slag blocking sliding plate brick but has poor thermal shock performance.

The patent No. ZL 201710731035.6 'sliding plate brick for converter slag stopping and preparation method thereof' discloses an aluminum-zirconium-carbon intermediate-temperature treatment slag stopping sliding plate brick, high-temperature sintering is not needed in the process of preparing the slag stopping sliding plate brick, the product can be used for a plurality of times, and the product has the comprehensive performances of corrosion resistance, scouring resistance, oxidation resistance, thermal shock resistance and the like

The conventional re-fired aluminum zirconium carbon slag blocking sliding plate needs to be fired under the protection of a reducing atmosphere at a high temperature, pitch is impregnated, the cost of the fired oil immersion is high, the use frequency is not high, and the number of times is generally 10-12; the conventional intermediate-temperature-sintered aluminum-zirconium-carbon slag blocking sliding plate needs intermediate-temperature sintering at the temperature of 600-900 ℃ in a reducing atmosphere, is impregnated with asphalt, and has great environmental pollution; although the zirconium-inlaid reburning or medium-temperature aluminum zirconium carbon slag blocking sliding plate is used for a heavier time or is high, a complex inlaying process is added, the potential safety hazard in the later use period is increased, the operation difficulty is increased, the high-temperature or medium-temperature protective burning is needed, and the cost of the inlaid zirconium plate is increased by 1-1.5 times. Three patents, publication No. CN 106630976A, CN 103864444A and patent No. ZL 201710731035.6, have made some improvements in performance of slag-stopping slide bricks, but still require high or moderate temperature protective firing. In conclusion, the prior art needs high-temperature or medium-temperature reduction atmosphere protection firing and asphalt impregnation, the cost performance is not high, and the comprehensive performance needs to be improved.

Disclosure of Invention

In view of the above, the invention aims to provide a converter slag-stopping baking-free soaking-free composite sliding plate brick and a preparation method thereof. The converter slag-stopping baking-free immersion-free composite sliding plate brick provided by the invention does not need high-temperature or medium-temperature baking or oil immersion, has the advantages of shortened production flow, high strength, better comprehensive performances of erosion and scouring resistance, oxidation resistance, thermal shock resistance and the like, and higher cost performance.

The invention provides a converter slag stopping baking-free soaking-free composite sliding plate brick, which comprises a surface layer and a bottom layer;

the surface layer raw material for forming the surface layer comprises the following components in parts by mass:

aggregate:

51-61 parts of plate-shaped corundum particles;

3-7 parts of silicon carbide particles;

in the aggregate, the mass percentage of particles with the granularity of more than or equal to 1mm is 36-46%, and the rest are particles with the granularity of less than 1 mm;

fine powder material:

fiber material:

0.5-1.5 parts of aluminum fiber;

binding agent:

5-6 parts of a composite resin binder;

the composite resin binder is organic silicon resin and phenolic resin;

the bottom layer raw material for forming the bottom layer comprises the following components in parts by mass:

aggregate:

GaL88 parts of high-alumina particles 62-71 parts;

in the aggregate, the mass ratio of the particles with the granularity of more than or equal to 1mm is 58-68 percent, and the rest are the particles with the granularity of less than 1 mm;

fine powder material:

binding agent:

4-5 parts of organic resin.

Preferably, the plate-like corundum particles comprise particles of the following different particle sizes:

12-18 parts of particles with the particle size of more than 0mm and less than or equal to 0.5 mm;

13-19 parts of particles with the particle size of more than 0.5mm and less than or equal to 1 mm;

22-28 parts of particles with the particle size of more than 1mm and less than or equal to 2.5 mm;

the granularity of the plate-shaped corundum powder is less than or equal to 0.045 mm;

the GaL88 high aluminum particles include particles of the following different particle sizes:

22-28 parts of particles with the particle size of more than 0mm and less than or equal to 1 mm;

39-45 parts of particles with the particle size of more than 1mm and less than or equal to 3 mm;

the particle size of the GaL88 high-alumina powder is less than or equal to 0.045 mm.

Preferably, in the surface layer raw material, the particle size of each raw material is as follows:

silicon carbide particles: the granularity is less than or equal to 1 mm;

calcining the alumina micro powder: the particle size is less than or equal to 5 mu m;

aluminum powder: the granularity is less than or equal to 0.074 mm;

silicon iron nitride powder: the granularity is less than or equal to 0.074 mm;

bentonite: the granularity is less than or equal to 0.074 mm;

carbon black: the particle size is less than or equal to 25 nm;

boron carbide powder: the granularity is less than or equal to 0.045 mm.

Preferably, in the bottom layer raw materials, the particle size of each raw material is as follows:

aluminum powder: the granularity is less than or equal to 0.074 mm;

alumina micropowder: the particle size is less than or equal to 5 mu m;

bonding clay: the granularity is less than or equal to 0.074 mm;

asphalt powder: the granularity is less than or equal to 0.088 mm.

Preferably, in the surface layer raw material, the aluminum powder comprises the following powder materials with different particle sizes:

2.5-5.5 parts of powder with the granularity of more than 0mm and less than or equal to 0.045 mm;

1.5-4.5 parts of powder with the granularity of more than 0mm and less than or equal to 0.074 mm;

in the bottom layer raw material, the aluminum powder comprises the following powder materials with different particle sizes:

1-3 parts of powder with the granularity of more than 0mm and less than or equal to 0.045 mm;

1-3 parts of powder with the granularity of more than 0mm and less than or equal to 0.074 mm.

Preferably, in the composite resin binder, the mass ratio of the organic silicon resin to the phenolic resin is (1-2) to (3-4);

the calcined alumina micro powder is calcined bimodal alpha alumina micro powder;

in the bottom layer raw material, the organic resin is phenolic resin;

the mass ratio of the surface layer raw material to the total amount of the surface layer raw material and the bottom layer raw material is 50-60%.

The invention also provides a preparation method of the converter slag stopping baking-free soaking-free composite sliding plate brick in the technical scheme, which comprises the following steps:

a) mixing aggregate, surface fine powder premixed powder, a binding agent and a fiber material to obtain a surface raw material;

the fine powder premixed powder is a mixed powder of fine powder;

b) mixing the aggregate, the bottom fine powder premixed powder and the binding agent to obtain a bottom raw material;

the fine powder premixed powder is a mixed powder of fine powder;

c) after the surface layer raw material and the bottom layer raw material are subjected to ageing, screening and iron removal, distributing the materials according to the surface layer and the bottom layer, and performing compression molding to obtain a green brick;

d) drying the green brick to obtain a composite sliding plate brick;

wherein the step a) and the step b) are not limited in order.

Preferably, the step a) specifically comprises:

after dry-mixing the aggregate, adding part of the binding agent for mixing and grinding, then adding the surface layer fine powder premixed powder for mixing and grinding, then adding the rest binding agent for mixing and grinding, and finally adding the fiber material for mixing to obtain a surface layer raw material;

the step b) specifically comprises the following steps:

and after the aggregate is dry-mixed, adding a bonding agent for mixing and grinding, and then adding the bottom fine powder premixed powder for mixing and grinding to obtain the bottom raw material.

Preferably, in the step c), the press forming is: carrying out double-sided pressure forming according to a sliding plate boss pre-feeding forming mode;

in the step d), the drying includes: natural drying, and then sending into a natural gas drying kiln for gradient temperature rise drying at room temperature to 240 ℃.

Preferably, the ageing conditions are as follows: the temperature is 20-25 ℃, the humidity is 80-85%, and the time is 24-36 h;

the sieving is to sieve by using an 8mm sieve;

the iron removal is strong magnetic iron removal;

in the green brick, the density of the surface layer forming body is more than or equal to 3.15g/cm ³ The apparent porosity is less than or equal to 2 percent; the density of the bottom layer forming body is more than or equal to 3.0g/cm ³ The apparent porosity is less than or equal to 2 percent.

In the surface layer raw material of the converter slag-stopping non-fired non-impregnated composite slide plate brick provided by the invention, plate-shaped corundum particles and silicon carbide particles are used as aggregates, plate-shaped corundum powder, calcined alumina micro powder, aluminum powder, ferrosilicon nitride powder, bentonite, carbon black and boron carbide powder are matched according to a certain proportion to form fine powder, and aluminum fiber and composite resin binders (organic silicon resin and phenolic resin) are added, wherein the various materials are in different particle grades and are matched according to a certain proportion to form the surface layer raw material. In the bottom layer raw material, GaL88 high-alumina particles are used as aggregate, GaL88 high-alumina powder, aluminum powder, alumina micro powder, combined clay and asphalt powder are matched to form fine powder, and organic resin binder is added, wherein the materials are in different particle grades and are matched according to a certain proportion to form the bottom layer raw material. Through the material matching, the strength, erosion and scouring resistance, oxidation resistance, thermal shock resistance and the like of the material can be effectively improved, the use frequency is improved when the material is used on a converter with more than 100 tons, and the used sliding plate has the advantages of smoother surface, less cracks, smaller erosion hole expansion and improved safety. In addition, the preparation process does not need to carry out middle and high temperature firing in the protection of reducing atmosphere, and does not need asphalt dipping treatment, thereby greatly simplifying the production process and saving energy.

Test results show that the normal-temperature compressive strength of the slag-stopping composite sliding plate provided by the invention reaches more than 185MPa, and the high-temperature bending strength reaches more than 42 MPa; the thermal shock resistance (1100 ℃, water cooling) result reaches more than 12 times; the oxidation resistance (1400 ℃ multiplied by 30min) is not more than 2.8 mm; the sliding plate is used on a converter with more than 100 tons, the use frequency reaches more than 16 times, the plate surface of the sliding plate is smoother after use, cracks are reduced, the corrosion and reaming are smaller, and the safety is improved.

Detailed Description

aggregate:

51-61 parts of plate-shaped corundum particles;

3-7 parts of silicon carbide particles;

in the aggregate, the mass ratio of the particles with the granularity of more than or equal to 1mm is 36-46%, and the rest are the particles with the granularity of less than 1 mm;

fine powder material:

fiber material:

0.5-1.5 parts of aluminum fiber;

binding agent:

5-6 parts of a composite resin binder;

the composite resin binder is organic silicon resin and phenolic resin;

aggregate:

GaL88 parts of high-aluminum particles;

in the granular material, the mass ratio of the granules with the granularity of more than or equal to 1mm is 58-68 percent, and the rest are the granules with the granularity of less than 1 mm;

fine powder material:

binding agent:

4-5 parts of organic resin.

[ with respect to the facing material ]:

in the invention, the surface layer raw materials comprise: aggregate, fine powder, fiber material and bonding agent. Wherein, the aggregate contains particles with the granularity of more than or equal to 1mm, and the fine powder has the granularity of less than or equal to 0.088 mm.

According to the invention, the aggregate comprises:

51-61 parts of plate-shaped corundum particles;

3-7 parts of silicon carbide particles.

In the invention, in the granular material, the mass ratio of granules with the granularity of more than or equal to 1mm is 36-46 percent, and the balance is granules with the granularity of less than 1 mm.

In the present invention, preferably, the plate-like corundum particles include particles of the following different particle sizes:

in the invention, the usage amount of the plate-shaped corundum particles is 51-61 parts, specifically 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, 60 parts and 61 parts. Wherein the dosage of the particles with the particle size of 0-0.5 mm is 12-18 parts, specifically 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts and 18 parts; the dosage of the particles with the diameter of 0.5-1 mm is 13-19 parts, specifically 14 parts, 15 parts, 16 parts and 18 parts; the amount of the 1-2.5 mm particles is 22-28 parts, specifically 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts and 28 parts.

In the present invention, it is preferable that the silicon carbide particles have a particle size of 1mm or less. The silicon carbide particles are used in an amount of 3-7 parts, specifically 3 parts, 4 parts, 5 parts, 6 parts, 7 parts.

According to the invention, the fine powder comprises:

in the invention, the granularity of the plate-shaped corundum powder is preferably less than or equal to 0.045 mm. In the invention, the dosage of the plate-shaped corundum powder is 11-17 parts, specifically 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts and 17 parts.

In the present invention, the calcined alumina fine powder is preferably a calcined bimodal alpha alumina fine powder, and the source thereof is not particularly limited, and may be a commercially available product. In the present invention, the particle size of the calcined alumina fine powder is preferably not more than 5 μm. In the invention, the calcined alumina micro powder is used in an amount of 6-10 parts, specifically 6 parts, 7 parts, 8 parts, 9 parts, 10 parts.

In the invention, the aluminum powder is used in an amount of 5-9 parts, specifically 5 parts, 6 parts, 7 parts, 8 parts and 9 parts. In the invention, the granularity of the aluminum powder is preferably less than or equal to 0.074 mm. More specifically, the aluminum powder comprises powder with two particle sizes, namely powder with the particle size of more than 0mm and less than or equal to 0.045mm and powder with the particle size of more than 0mm and less than or equal to 0.074 mm. The powder with the particle size of more than 0mm and less than or equal to 0.045mm refers to the powder with the particle size distribution of 0-0.045 mm, the average particle size D50 is preferably 22-25 μm, and in some embodiments, the average particle size D50 is 23 μm. The powder with the particle size of 0mm < 0.074mm refers to powder with the particle size distribution of 0-0.074 mm, the average particle size D50 is preferably 30-38 μm, and the average particle size D50 is 32 μm in some embodiments of the invention. Wherein the amount of the powder with the granularity of more than 0mm and less than or equal to 0.045mm is 2.5-5.5 parts, specifically 2.5 parts, 3 parts, 4 parts, 5 parts and 5.5 parts; the amount of the powder with the granularity of more than 0mm and less than or equal to 0.074mm is 1.5-4.5 parts, specifically 1.5 parts, 2 parts, 3 parts, 4 parts and 4.5 parts.

In the invention, the granularity of the ferrosilicon nitride powder is preferably less than or equal to 0.074 mm. In the invention, the usage amount of the ferrosilicon nitride powder is 2-6 parts, specifically 2 parts, 3 parts, 4 parts, 5 parts and 6 parts.

In the invention, the particle size of the bentonite is preferably less than or equal to 0.074 mm. In the invention, the amount of the bentonite is 1-3 parts, specifically 1 part, 1.5 parts, 2 parts, 2.5 parts and 3 parts.

In the present invention, the particle size of the carbon black is preferably 25nm or less. In some embodiments of the present invention, the carbon black is N220 carbon black. In the invention, the amount of the carbon black is 1-3 parts, specifically 1 part, 1.5 parts, 2 parts, 2.5 parts and 3 parts.

In the invention, the granularity of the boron carbide powder is preferably less than or equal to 0.045 mm. In the invention, the boron carbide powder is used in an amount of 0.5-1.5 parts, specifically 0.5 part, 1.0 part and 1.5 parts.

According to the invention, the fibre material is aluminium fibre. In the present invention, the aluminum fibers preferably have the following specifications: phi 0.09X 3mm (i.e. diameter 0.09mm, length 3 mm). In the invention, the amount of the aluminum fiber is 0.5-1.5 parts, specifically 0.5 part, 1.0 part and 1.5 parts.

According to the invention, the binder is a composite resin binder; the composite resin binder is organic silicon resin and phenolic resin. In some embodiments of the present invention, the silicone resin is an S-2099 silicone resin. In some embodiments of the invention, the phenolic resin is PF5321 phenolic resin. In the invention, the mass ratio of the organic silicon resin to the phenolic resin is (1-2) to (3-4), and specifically can be 1: 4, 2: 3 and 2: 2.5. In the invention, the dosage of the binding agent is 5-6 parts, specifically 5.0 parts, 5.5 parts and 6.0 parts.

The invention adopts plate-shaped corundum particles and silicon carbide particles as aggregates, adopts plate-shaped corundum powder, calcined alumina micro powder, aluminum powder, silicon nitride iron powder, bentonite, carbon black and boron carbide powder to prepare fine powder according to a certain proportion, concretely adopts eight-grade continuous particle grades of 2.5-1 mm, 1-0.5 mm, 1-0 mm, 0.5-0 mm, less than or equal to 0.074mm, less than or equal to 0.045mm, less than or equal to 5 mu m and less than or equal to 25nm to prepare materials, and then adds aluminum fibers and composite resin binders (organic silicon resin and phenolic resin) to jointly form a surface layer raw material.

[ with respect to the starting materials for the bottom layer ]:

in the invention, the bottom layer comprises the following raw materials: aggregate, fine powder and a bonding agent. Wherein the granule material contains granules with the granularity of more than or equal to 1mm, and the granularity of the fine powder material is less than or equal to 0.088 mm.

According to the invention, the aggregate is GaL88 high-alumina particles. In the invention, the amount of the GaL88 high-aluminum particles is 62-72 parts, specifically 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, 71 parts and 72 parts. In the invention, the GaL88 high-aluminum particles preferably comprise particles with different particle sizes, specifically particles with the particle size of more than 0mm and less than or equal to 1mm and particles with the particle size of more than 1mm and less than or equal to 3 mm. In the invention, the mass ratio of the particles with the granularity of more than or equal to 1mm in the particle material is 58-68 percent, and the rest are the particles with the granularity of less than 1 mm. In the invention, the preferable dosage of the particles with the particle size of more than 0mm and less than or equal to 1mm is 22-28 parts, specifically 22 parts, 23 parts, 25 parts, 26 parts, 27 parts and 28 parts; the preferable dosage of the particles with the granularity of more than 1mm and less than or equal to 3mm is 39-45 parts, and specifically 39 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts and 45 parts.

According to the invention, the fine powder comprises:

in the invention, the grain size of the GaL88 high-alumina powder is preferably less than or equal to 0.045 mm. In the invention, the amount of the GaL88 high-alumina powder is 17-25 parts, specifically 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts and 25 parts.

In the invention, the aluminum powder is used in an amount of 2-6 parts, specifically 2 parts, 3 parts, 4 parts, 5 parts and 6 parts. In the invention, the granularity of the aluminum powder is preferably less than or equal to 0.074 mm. More specifically, the aluminum powder comprises powder with two particle sizes, namely powder with the particle size of more than 0mm and less than or equal to 0.045mm and powder with the particle size of more than 0mm and less than or equal to 0.074 mm. Wherein, the powder with the particle size of 0mm < 0.045mm refers to the powder with the particle size distribution of 0-0.045 mm, the average particle size D50 is preferably 22-25 μm, and in some embodiments of the invention, the average particle size D50 is 23 μm. The powder with the particle size of 0mm < 0.074mm refers to powder with the particle size distribution of 0-0.074 mm, the average particle size D50 is preferably 30-38 μm, and the average particle size D50 is 32 μm in some embodiments of the invention. Wherein the amount of the powder with the granularity of more than 0mm and less than or equal to 0.045mm is 1-3 parts, specifically 1 part, 2 parts and 3 parts; the amount of the powder with the granularity of more than 0mm and less than or equal to 0.074mm is 1-3 parts, specifically 1 part, 2 parts and 3 parts.

In the present invention, the particle size of the fine alumina powder is preferably not more than 5 μm. In the invention, the amount of the alumina micro powder is 3-7 parts, specifically 3 parts, 4 parts, 5 parts, 6 parts and 7 parts.

In the present invention, the particle size of the bound clay is preferably 0.074mm or less. In the invention, the amount of the bonding clay is 1-3 parts, specifically 1.0 part, 1.5 parts, 2.0 parts, 2.25 parts, 2.5 parts, and 3.0 parts.

In the present invention, the asphalt powder is preferably a high-temperature asphalt powder. In the invention, the granularity of the asphalt powder is preferably less than or equal to 0.088 mm. In the invention, the amount of the asphalt powder is 0.5-1.5 parts, specifically 0.5 part, 0.6 part, 0.7 part, 0.75 part, 0.8 part, 0.9 part, 1.0 part, 1.1 part, 1.2 parts, 1.3 parts, 1.4 parts and 1.5 parts.

According to the invention, the binder is an organic resin binder, preferably a phenolic resin. In some embodiments of the invention, the phenolic resin is PF5321 phenolic resin. In the invention, the amount of the binder is 4-5 parts, specifically 4.0 parts, 4.1 parts, 4.2 parts, 4.3 parts, 4.4 parts, 4.5 parts, 4.6 parts, 4.7 parts, 4.8 parts, 4.9 parts and 5.0 parts.

The invention adopts GaL88 high-alumina particles as aggregate, adopts GaL88 high-alumina powder, aluminum powder, alumina micropowder, clay and asphalt powder to form fine powder, concretely adopts six continuous particle grades of 3-1 mm, 1-0 mm, less than or equal to 0.088mm, less than or equal to 0.074mm, less than or equal to 0.045mm and less than or equal to 5 mu m to carry out burdening, and adds organic resin binder to jointly form a bottom layer raw material.

In the present invention, the mass ratio of the surface layer raw material to the total amount of the surface layer raw material and the bottom layer raw material is preferably 50% to 60%, and specifically may be 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%.

the surface layer fine powder premixing powder is mixed powder of fine powder;

the bottom fine powder premixed powder is mixed powder of fine powder;

d) drying the green brick to obtain a composite sliding plate brick;

wherein the step a) and the step b) are not limited in order.

The types and the amounts of the aggregates, the fine powders, the binders and the fiber materials in the surface layer raw materials and the aggregates, the fine powders and the binders in the bottom layer raw materials are the same as those in the above technical scheme, and are not described in detail herein.

[ with respect to step a ]:

in the invention, the surface fine powder premixed powder is mixed powder of fine powder, namely the fine powder is uniformly mixed in advance to form the surface fine powder premixed powder. The fine powder is the same as the fine powder in the surface layer raw material in the technical scheme, and is not described again. The mixing is preferably carried out in a mixing device for intensive mixing, the rotating speed of the mixing is preferably 60-65 rpm, and the mixing time is preferably 25-30 min.

In the present invention, the step a) preferably specifically includes: after the granular materials are dry-mixed, adding part of the binding agent for mixing and grinding, then adding the surface layer fine powder premixed powder for mixing and grinding, then adding the rest of the binding agent for mixing and grinding, and finally adding the fiber material for mixing to obtain the surface layer raw material.

The dry mixing of the particle materials is preferably carried out in a mixing machine, and the dry mixing time is preferably 2-3 min. The amount of the partial binder is preferably 70-80% of the total weight of all binders, and specifically may be 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%. The time for mixing and grinding after adding part of the binding agent is preferably 10-12 min. The time for mixing and grinding the added surface fine powder premixed powder is preferably 4-5 min. The time for mixing and grinding by adding the rest of the binding agent is preferably 2-3 min. And finally, adding the aluminum fibers for mixing for preferably 30-40 min. And (4) uniformly mixing all the raw materials, and discharging to obtain the surface layer raw material.

[ regarding step b ]:

in the invention, the bottom layer fine powder premixed powder is mixed powder of fine powder, namely the fine powder is uniformly mixed in advance to form fine powder premixed powder. The fine powder is the same as the fine powder in the bottom layer raw material in the technical scheme, and the details are not repeated. The mixing is preferably carried out in a mixing device for intensive mixing, the rotating speed of the mixing is preferably 60-65 rpm, and the mixing time is preferably 25-30 min.

In the present invention, the step b) preferably specifically includes: after the granules are dry-mixed, adding a binding agent for mixing and grinding, and then adding bottom fine powder premixed powder for mixing and grinding to obtain a bottom raw material.

The dry mixing of the granules is preferably carried out in a mixing machine, and the dry mixing time is preferably 1-2 min. The time for mixing and grinding by adding the binder is preferably 2-3 min. And finally, adding the bottom fine powder premix powder for mixing and grinding for preferably 30-40 min. And (4) uniformly mixing all the raw materials, and discharging to obtain a bottom layer raw material.

The present invention is not particularly limited to the order of the above step a) and step b).

[ with respect to step c ]:

in the invention, the surface layer raw material and the bottom layer raw material are subjected to ageing, sieving and iron removal, and the surface layer raw material and the bottom layer raw material are respectively subjected to the treatment instead of mixing the surface layer raw material and the bottom layer raw material together.

In the invention, the ageing process is preferably carried out at 20-25 ℃, and specifically at 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃ and 25 ℃. The humidity condition of the ageing mixture is preferably 80-85%, and specifically can be 80%, 81%, 82%, 83%, 84% and 85%. In the invention, the ageing time is preferably 24-36 h, and specifically can be 24h, 26h, 28h, 30h, 32h, 34h and 36 h.

In the present invention, after the above-mentioned ageing, the resultant pug is sieved to remove agglomerated materials. In the invention, the sieve with the size of 8mm is preferably selected, and the sieved material is subjected to subsequent treatment. In the present invention, iron is removed from the material to be sieved after the sieving treatment. In the invention, the iron removal is preferably strong magnetic iron removal so as to remove iron-containing impurities such as process iron.

According to the invention, after the treatment, the materials are distributed according to the surface layer and the bottom layer, specifically, a material distributor is placed firstly, the bottom layer raw material is laid at the bottom to form a bottom layer raw material layer, and then the surface layer raw material is laid in the material distributor and on the bottom layer raw material layer to form a surface layer raw material layer. When the fabric is distributed, the upper fabric and the lower fabric are preferably compounded by controlling the mass ratio of the surface layer raw material to the total mass of the surface layer raw material and the bottom layer raw material to be 50-60%, and the mass ratio can be 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59% and 60%.

In the invention, after the cloth is processed, the cloth is pressed and formed. In the invention, the compression molding is preferably double-sided compression molding, and more preferably double-sided compression molding is carried out according to a sliding plate boss pre-feeding molding mode. In the present invention, the double-sided press molding is preferably performed on an electric double-screw press of 1250 tons or more. The double-sided pressurization according to the sliding plate boss pre-feeding forming mode can be realized by a pressing sliding plate boss processing device (see the 'pressing sliding plate boss processing device' disclosed by the publication number CN 105903946A), and the distributor has the function of ensuring that the periphery of the sliding plate casting hole and the boss part are all made of fabric. And pressing and forming to obtain green bricks. In the invention, the green brick achieves the following aims through press forming: surface layerThe density of the formed body is more than or equal to 3.15g/cm ³ The apparent porosity is less than or equal to 2 percent; the density of the bottom layer forming body is more than or equal to 3.0g/cm ³ The apparent porosity is less than or equal to 2 percent.

[ with respect to step d ]:

in the present invention, the drying preferably includes: natural drying, and then sending into a natural gas drying kiln for gradient temperature rise drying at room temperature to 240 ℃. The natural drying time is preferably 24-36 h, and specifically can be 24h, 26h, 28h, 30h, 32h, 34h and 36 h. After natural drying, sending the mixture into a natural gas drying kiln for gradient heating drying; the drying curve is preferably: the temperature is raised from the room temperature to 60 ℃ within 1-2 h and is preserved for 3-5 h, then the temperature is raised from 60 ℃ to 80 ℃ within 1-3 h and is preserved for 7-9 h, then the temperature is raised from 80 ℃ to 110 ℃ within 3-5 h and is preserved for 7-9 h, then the temperature is raised from 110 ℃ to 170 ℃ within 4-6 h and is preserved for 1-2 h, then the temperature is raised from 170 ℃ to 220 ℃ within 2-4 h and is preserved for 6-8 h, and then the mixture is naturally cooled to the room temperature. The room temperature may specifically be 20 ℃. The drying time in the natural gas drying kiln is preferably 36-48 h, and specifically can be 36h, 40h, 42h, 44h, 46h and 48 h. And drying to obtain the converter slag-stopping baking-free soaking-free composite sliding plate brick.

In the present invention, after the above preparation process, it is preferable to further perform an assembly process. The assembling process includes: hooping, iron shell sleeving, grinding, drying, coating and the like, wherein the specific process is not particularly limited, and the operation is carried out according to the conventional post-treatment process in the field. After the above assembly process, inspection and packaging are preferably also performed: and after the inspection is qualified, the materials are put into a packaging box, and corresponding marks are made to obtain a finished product.

The invention has the following beneficial effects:

1. in the surface layer raw material, plate-shaped corundum particles and silicon carbide particles are used as aggregates, plate-shaped corundum powder, calcined alumina micro powder, aluminum powder, ferrosilicon nitride powder, bentonite, carbon black and boron carbide powder are matched according to a certain proportion to form fine powder, aluminum fibers and composite resin binders (organic silicon resin and phenolic resin) are added, and the materials are matched according to a certain proportion to form the surface layer raw material, and the surface layer raw material and the silicon carbide powder act together to improve the material. Normal, medium and high temperature strength, thermal shock resistance, oxidation resistance, erosion resistance and scouring resistance. Wherein, the plate-shaped corundum particles and the silicon carbide particles are used as aggregates of surface layer raw materials, which is the basic guarantee of a high-quality sliding plate and plays a role in supporting a framework; corundum fine powder is the main component of the skateboard substrate; the reasonable particle level is beneficial to improving the uniformity, compactness and processability of the converter slag-stopping sliding plate brick; the nano carbon black has better dispersibility, slag resistance and thermal shock resistance, and the aluminum powder, the aluminum fiber, the silicon nitride iron, the boron carbide and the like are beneficial to improving the density of the sliding plate, reducing the porosity, increasing the medium and high temperature strength of the sliding plate and increasing the toughness, oxidation resistance, erosion resistance and scouring resistance of the sliding plate; the high-activity bimodal alpha alumina micro powder and the bentonite can be filled in a micro space, the particle accumulation is optimized, the porosity is reduced, the volume density is improved, the ceramic sintering is promoted, and the wear resistance and the mechanical strength of the sliding plate are improved.

2. Introducing ferrosilicon nitride reinforced phase (Fe-Si) ₃ N ₄ ) Which contains Si ₃ N ₄ The phase and the Fe plastic phase are matched with other components, so that the refractoriness, the erosion resistance, the mechanical strength, the thermal shock resistance, the reduction of the thermal expansion rate, the improvement of the oxidation resistance and the like can be improved, the good sintering performance is generated, and the Si mainly occurs under the high-temperature use working condition ₃ N ₄ Conversion to SiC, Fe in SiFe nitride ₃ The Si particles become smaller gradually in the process and are dispersed in the new phase of SiC and the beta-Si which is not converted completely ₃ N ₄ In the process, the texture structure of the material is compact.

3. The organic silicon and phenolic resin composite bonding agent is introduced, so that various raw materials of the sliding plate can be well wetted, the mixing quality is optimized, the volume density of a semi-finished brick blank is improved, and the porosity is reduced. During the low-temperature drying and slag-stopping use of the sliding plate, various bonding modes such as resin bonding, carbon bonding, metal plastic bonding, metal ceramic bonding and the like are formed, so that higher low and medium high-temperature strength is obtained, the strength consistency of the material is maintained, and the thermal shock resistance of the material is improved.

4. By adopting a fine powder premixing process, various components with various varieties and small addition amount of the sliding plate matrix can be uniformly mixed, so that homogeneous pug is obtained, and the integral performance uniformity of the slag-stopping sliding plate is ensured.

5. The slide plate is formed by adopting the processes of up-and-down compounding of the fabric and the bottom material, double-side pressurization and boss pre-feeding, so that the formula cost can be reasonably reduced, the density of the working surface of the slag-stopping slide plate and the boss material can be basically consistent, and the stability of the medium-temperature and high-temperature performance of the material is improved.

6. The slag-stopping sliding plate does not need to be sintered at medium and high temperatures in the protection of reducing atmosphere, does not need asphalt dipping treatment, greatly simplifies the production process, saves energy, improves the working environment, accords with national policies of energy conservation and emission reduction and environmental protection, and upgrades new products for industry.

7. According to the invention, by adjusting the formula of the sliding plate brick, the production process of the sliding plate brick is simplified and optimized, the comprehensive performance and the cost performance of the sliding plate brick are further improved, the sliding plate brick for converter slag blocking with high strength, erosion and erosion resistance, oxidation resistance, thermal shock resistance and other excellent performances is obtained, the average frequency of the sliding plate brick is more than 16 times when the sliding plate brick is used on a converter with more than 100 tons, and the sliding plate is basically equivalent to a zirconium-inlaid re-burning or medium-temperature aluminum-zirconium-carbon slag blocking sliding plate and is superior to a conventional re-burning or medium-temperature aluminum-zirconium-carbon slag blocking sliding plate. After the sliding plate is used, the surface of the sliding plate is smoother, cracks are reduced, erosion reaming is smaller, and safety is improved.

For a further understanding of the present invention, reference will now be made to the following preferred embodiments of the invention in conjunction with the examples, but it is to be understood that the description is intended to further illustrate the features and advantages of the invention and is not intended to limit the scope of the claims which follow.

Example 1

1. Raw materials:

1.1. the surface layer comprises the following raw materials:

aggregate:

fine powder material:

fiber material:

0.5 part of aluminum fiber (phi 0.09 multiplied by 3 mm);

binding agent:

2 parts of S-2099 organic silicon resin;

PF5321 phenolic resin 3 parts.

1.2. The bottom layer comprises the following raw materials:

aggregate:

GaL88 parts of high-aluminum particles (the particle size is more than 0mm and less than or equal to 1 mm);

GaL88 parts of high-aluminum particles (the particle size is more than 1mm and less than or equal to 3 mm);

fine powder material:

binding agent:

PF5321 and 4 parts of phenolic resin.

2. Preparation:

s1, putting the tabular corundum particles and the silicon carbide particles into a mixing machine for dry mixing for 3 minutes, adding 2.4 parts of PF5321 phenolic resin and 1.6 parts of S-2099 organic silicon resin for mixing and grinding for 12 minutes, adding the surface layer fine powder for pre-mixing and grinding for 5 minutes, adding 0.6 part of PF5321 phenolic resin and 0.4 part of S-2099 organic silicon resin for mixing and grinding for 3 minutes, finally uniformly scattering aluminum fibers, discharging after clean mixing for 40 minutes, and preparing the fabric.

Wherein the surface fine powder premixed powder is obtained by the following method:

adding the plate-shaped corundum fine powder, the calcined bimodal alpha alumina micro powder, the metal aluminum powder, the bentonite, the silicon nitride iron powder, the carbon black and the boron carbide powder into premixing equipment together, and premixing for 20 minutes to obtain the fine material premix for the surface layer.

S2, putting GaL88 high-alumina particles with two particle size grades into a mixing machine, dry-mixing for 2 minutes, adding PF5321 phenolic resin, mixing and grinding for 3 minutes, adding bottom fine powder, pre-mixing and grinding for 40 minutes, and discharging to obtain the base material.

Wherein the bottom fine powder premixed powder is obtained by the following method:

GaL88 high-alumina powder, metal aluminum powder, alumina micro powder, bonding clay and high-temperature asphalt powder are added into a premixing device together and premixed for 20 minutes to prepare bottom fine powder premixed powder.

S3, pushing the fabric and the bottom material into a trapping chamber for trapping, wherein the trapping conditions are as follows: the temperature is 25 ℃, the humidity is 85 percent, and the time is 36 hours. After ageing, the pug is sieved by a 8mm sieve, and the sieved material is deironized by strong magnetism.

S4, forming on a 1250-ton electric double-screw press, compounding and distributing materials up and down according to 50% of the fabric and 50% of the bottom material, and requiring that the fabric is completely arranged around the lug boss of the sliding plate and the casting hole, and adopting double-sided pressure forming according to the pre-feeding forming mode of the lug boss of the sliding plate, wherein the density of the formed body of the fabric of the sliding plate is required to be more than or equal to 3.15g/cm ³ The apparent porosity is less than or equal to 2 percent, and the density of the sliding plate bottom material forming body is more than or equal to 3.0g/cm ³ The apparent porosity is less than or equal to 2 percent.

S5, naturally drying the formed green skateboard brick in the air for 36 hours, and then drying in a natural gas drying kiln, wherein the drying curve is as follows: the temperature is firstly increased from 20 ℃ to 60 ℃ within 1.5h, the temperature is kept for 4.5h, then the temperature is increased from 60 ℃ to 80 ℃ within 2h, the temperature is kept for 8h, then the temperature is increased from 80 ℃ to 110 ℃ within 4h, the temperature is kept for 8h, then the temperature is increased from 110 ℃ to 170 ℃ within 5h, the temperature is kept for 2h, then the temperature is increased from 170 ℃ to 220 ℃ within 3h, the temperature is kept for 7h, and then the temperature is naturally cooled to 20 ℃. And (4) reassembling and processing, including hooping, casing, grinding, drying and coating. And (5) inspecting and packaging, namely, after the inspection is qualified, filling the materials into a packaging box, and making corresponding marks.

Example 2

1. Raw materials:

1.1. the surface layer comprises the following raw materials:

aggregate:

fine powder material:

fiber material:

1 part of aluminum fiber (phi 0.09 multiplied by 3 mm);

binding agent:

2 parts of S-2099 organic silicon resin;

PF5321 phenolic resin 3 parts.

1.2. The bottom layer comprises the following raw materials:

aggregate:

fine powder material:

binding agent:

4.5 parts of PF5321 phenolic resin.

2. Preparation:

s1, putting the tabular corundum particles and the silicon carbide particles into a mixing machine for dry mixing for 2 minutes, adding 2.4 parts of PF5321 phenolic resin and 1.6 parts of S-2099 organic silicon resin for mixing and grinding for 10 minutes, adding the surface layer fine powder for pre-mixing and grinding for 4 minutes, adding 0.6 part of PF5321 phenolic resin and 0.4 part of S-2099 organic silicon resin for mixing and grinding for 2 minutes, finally uniformly scattering aluminum fibers, discharging after net mixing for 30 minutes, and preparing the fabric.

adding the plate-shaped corundum fine powder, the calcined bimodal alpha alumina micro powder, the metal aluminum powder, the bentonite, the silicon nitride iron powder, the carbon black and the boron carbide powder into a premixing device together, and premixing for 30 minutes to obtain the fine material premix for the surface layer.

S2, putting GaL88 high-alumina particles with two particle size grades into a mixing machine, dry-mixing for 1 minute, adding PF5321 phenolic resin, mixing and grinding for 2 minutes, adding bottom layer fine powder, pre-mixing and grinding for 30 minutes, and discharging to obtain the base material.

GaL88 high-alumina powder, metal aluminum powder, alumina micro powder, bonding clay and high-temperature asphalt powder are added into a premixing device together and premixed for 30 minutes to prepare bottom fine powder premixed powder.

S3, pushing the fabric and the bottom material into a material trapping chamber for trapping, wherein the trapping conditions are as follows: the temperature is 20 ℃, the humidity is 80 percent, and the time is 24 hours. After ageing, the pug is sieved by a 8mm sieve, and the sieved material is deironized by strong magnetism.

S4, forming on a 1250-ton electric double-screw press, compounding and distributing the fabric up and down according to 60% of the fabric and 40% of the bottom material, and requiring that the fabric is completely arranged around the lug boss of the sliding plate and the casting hole, and adopting double-sided pressure forming according to the pre-feeding forming mode of the lug boss of the sliding plate, wherein the density of the formed body of the fabric of the sliding plate is required to be more than or equal to 3.15g/cm ³ The apparent porosity is less than or equal to 2 percent, and the density of the sliding plate bottom material forming body is more than or equal to 3.0g/cm ³ The apparent porosity is less than or equal to 2 percent.

S5, drying the formed green skateboard brick naturally in the air for 24 hours, and then drying in a natural gas drying kiln, wherein the drying curve is the same as that of the embodiment 1. And (4) reassembling and processing, including hooping, casing, grinding, drying and coating. And (5) inspecting and packaging, namely, after the inspection is qualified, filling the materials into a packaging box, and making corresponding marks.

Example 3

1. Raw materials:

1.1. the surface layer comprises the following raw materials:

aggregate:

fine powder material:

fiber material:

0.5 part of aluminum fiber (phi 0.09 multiplied by 3 mm);

binding agent:

1 part of S-2099 organic silicon resin;

PF5321 phenolic resin 4 parts.

1.2. The bottom layer comprises the following raw materials:

aggregate:

GaL88 parts of high-aluminum particles (the particle size is more than 1mm and less than or equal to 3mm) 44 parts;

fine powder material:

binding agent:

4.8 parts of PF5321 phenolic resin.

2. Preparation:

s1, putting the tabular corundum particles and the silicon carbide particles into a mixing machine for dry mixing for 2.5 minutes, adding 3.2 parts of PF5321 phenolic resin and 0.8 part of S-2099 organic silicon resin for mixing and grinding for 11 minutes, adding the surface layer fine powder for pre-mixing and grinding for 4.5 minutes, adding 0.8 part of PF5321 phenolic resin and 0.2 part of S-2099 organic silicon resin for mixing and grinding for 2.5 minutes, finally uniformly scattering aluminum fibers, discharging after clean mixing for 35 minutes, and obtaining the fabric.

adding the plate-shaped corundum fine powder, the calcined bimodal alpha alumina micro powder, the metal aluminum powder, the bentonite, the silicon nitride iron powder, the carbon black and the boron carbide powder into a premixing device together, and premixing for 25 minutes to obtain the fine material premix for the surface layer.

S2, putting GaL88 high-aluminum particles with two granularity levels into a mixing machine, dry-mixing for 1.5 minutes, adding PF5321 phenolic resin, mixing and grinding for 2.5 minutes, adding bottom fine powder, pre-mixing and grinding for 35 minutes, and discharging to obtain the bottom material.

GaL88 high-alumina powder, metal aluminum powder, alumina micro powder, bonding clay and high-temperature asphalt powder are added into a premixing device together and premixed for 25 minutes to prepare bottom fine powder premixed powder.

S3, pushing the fabric and the bottom material into a trapping chamber for trapping, wherein the trapping conditions are as follows: the temperature is 22 ℃, the humidity is 82 percent, and the time is 30 hours. After ageing, the pug is sieved by a 8mm sieve, and the sieved material is deironized by strong magnetism.

S4, forming on a 1250-ton electric double-screw press, compounding and distributing 50% of plus material and 50% of base material up and down, and requiring that the plus material is completely distributed around the lug boss of the sliding plate and the casting hole, and adopting double-sided pressure forming according to the lug boss pre-feeding forming mode of the sliding plateThe density of the formed body of the shell fabric of the sliding plate is required to be more than or equal to 3.15g/cm ³ The apparent porosity is less than or equal to 2 percent, and the density of the sliding plate bottom material forming body is more than or equal to 3.0g/cm ³ The apparent porosity is less than or equal to 2 percent.

S5, drying the formed green skateboard brick naturally in the air for 30 hours, and then drying in a natural gas drying kiln, wherein the drying curve is the same as that of the embodiment 1. And (4) reassembling and processing, including hooping, casing, grinding, drying and coating. And (5) inspecting and packaging, namely filling the materials into a packaging box after the materials are qualified through inspection, and making corresponding marks.

Example 4

1. Raw materials:

1.1. the surface layer comprises the following raw materials:

aggregate:

fine powder material:

fiber material:

0.75 part of aluminum fiber (phi 0.09 multiplied by 3 mm);

binding agent:

1 part of S-2099 organic silicon resin;

PF5321 and 4 parts of phenolic resin.

1.2. The bottom layer comprises the following raw materials:

aggregate:

GaL88 parts of high-alumina particles (the particle size is more than 0mm and less than or equal to 1 mm);

fine powder material:

binding agent:

4.5 parts of PF5321 phenolic resin.

2. Preparation:

s1, putting the tabular corundum particles and the silicon carbide particles into a mixing machine for dry mixing for 3 minutes, adding 3.2 parts of PF5321 phenolic resin and 0.8 part of S-2099 organic silicon resin for mixing and grinding for 12 minutes, adding the surface layer fine powder for pre-mixing and grinding for 5 minutes, adding 0.8 part of PF5321 phenolic resin and 0.2 part of S-2099 organic silicon resin for mixing and grinding for 3 minutes, finally uniformly scattering aluminum fibers, discharging after clean mixing for 36 minutes, and preparing the fabric.

adding the plate-shaped corundum fine powder, the calcined bimodal alpha alumina micro powder, the metal aluminum powder, the bentonite, the silicon nitride iron powder, the carbon black and the boron carbide powder into a premixing device together, and premixing for 28 minutes to obtain the surface fine material premix.

S2, putting GaL88 high-alumina particles with two particle size grades into a mixing machine, dry-mixing for 2 minutes, adding PF5321 phenolic resin, mixing and grinding for 3 minutes, adding bottom fine powder, pre-mixing and grinding for 36 minutes, and discharging to obtain the base material.

GaL88 high-alumina powder, metal aluminum powder, alumina micro powder, bonding clay and high-temperature asphalt powder are added into a premixing device together and premixed for 28 minutes to prepare bottom fine powder premixed powder.

S3, pushing the fabric and the bottom material into a trapping chamber for trapping, wherein the trapping conditions are as follows: the temperature is 24 ℃, the humidity is 83 percent, and the time is 32 hours. After ageing, screening the pug by using a 8mm sieve, and removing iron from the sieved material by using strong magnetism.

S5, drying the formed green skateboard brick naturally in the air for 34 hours, and then drying in a natural gas drying kiln, wherein the drying curve is the same as that of the embodiment 1. And (4) reassembling and processing, including hooping, casing, grinding, drying and coating. And (5) inspecting and packaging, namely, after the inspection is qualified, filling the materials into a packaging box, and making corresponding marks.

Example 5: performance testing

The composite slide bricks obtained in examples 1 to 4 were subjected to chemical composition (Al) ₂ O ₃ 、C _{General assembly} 、Si ₃ N ₄ ) And testing apparent porosity, volume density, normal temperature pressure resistance, high temperature fracture resistance, oxidation resistance and thermal shock resistance:

(1) the test method comprises the steps of sampling and the like, and executing according to the YB/T5049-2009 sliding brick standard.

(2) The alumina content is determined according to a zinc acetate back titration EDTA volumetric method (9.1) in the chemical analysis method of GB/T6900-2006 aluminum-silicon series refractory material.

The total carbon content was determined according to the volumetric method (10.1) of combustion gas in the chemical analysis method of the refractory containing carbon, silicon carbide and nitride in GB/T16555-.

According to the chemical analysis method of the refractory material containing carbon, silicon carbide and nitride in GB/T16555- ₃ N ₄ ) The amount of silicon nitride was measured.

(3) And testing the apparent porosity and the volume density of the baking-free and soaking-free composite sliding plate brick according to the test methods of the volume density, the apparent porosity and the vacuum porosity of the compact and shaped refractory product in GB/T2997-2000.

(4) The compressive strength, namely the erosion resistance, of the baking-free soaking-free composite sliding plate brick is tested according to the test method of the normal-temperature compressive strength of GB/T5072-2008 refractory material.

(5) The high-temperature rupture strength, namely the high-temperature scouring resistance, of the baking-free and soaking-free composite sliding plate brick is tested according to the test method of the high-temperature rupture strength of GB/T3002-2004 refractory material.

(6) And testing the thermal shock stability of the baking-free immersion-free composite sliding plate brick according to a thermal shock resistance test method (water quenching method) of the YB/T376.1-1995 refractory product.

(7) Testing the oxidation resistance of the baking-free soaking-free composite sliding plate brick according to a test method of GB/T17732-2008 compact setting carbon-containing refractory products, and specifically testing the oxidized depth of a test sample in an oxidation environment, wherein the unit is mm; the smaller the depth, the more oxidation resistance is represented.

The test results are shown in table 1:

table 1: results of Performance test of the composite slide tiles obtained in examples 1 to 4

As can be seen from the test results in Table 1, the composite sliding plate brick provided by the invention has the advantages of high alumina content, moderate total carbon content and moderate silicon nitride content; the normal temperature compressive strength reaches more than 185MPa, and the anti-scouring performance is excellent; the high-temperature rupture strength reaches more than 42MPa, and the high-temperature anti-scouring performance is excellent; the thermal shock resistance test frequency reaches more than 12 times, and the excellent thermal shock resistance is shown; the oxidation resistance test result shows that the thickness is not more than 2.8mm, and the excellent oxidation resistance is shown; the sliding plate is used on a converter with more than 100 tons, the use frequency reaches more than 16 times, the plate surface of the sliding plate is smoother after use, cracks are reduced, the corrosion and reaming are smaller, and the safety is improved.

The foregoing examples are provided to facilitate an understanding of the principles of the invention and their core concepts, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The scope of the invention is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that approximate the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.

Claims

1. A converter slag-stopping non-fired non-dipped composite sliding plate brick is characterized by comprising a surface layer and a bottom layer;

aggregate:

51-61 parts of plate-shaped corundum particles;

3-7 parts of silicon carbide particles;

fine powder material:

fiber material:

0.5-1.5 parts of aluminum fiber;

binding agent:

5-6 parts of a composite resin binder;

the composite resin binder is organic silicon resin and phenolic resin;

aggregate:

GaL88 parts of high-alumina particles 62-71 parts;

fine powder material:

binding agent:

4-5 parts of organic resin.

2. The slide plate brick according to claim 1, wherein said plate-like corundum particles comprise particles of the following different particle sizes:

3. The slide plate brick as claimed in claim 1, wherein the grain size of the raw materials of the facing layer is as follows:

silicon carbide particles: the granularity is less than or equal to 1 mm;

aluminum powder: the granularity is less than or equal to 0.074 mm;

silicon iron nitride powder: the granularity is less than or equal to 0.074 mm;

bentonite: the granularity is less than or equal to 0.074 mm;

carbon black: the particle size is less than or equal to 25 nm;

boron carbide powder: the granularity is less than or equal to 0.045 mm.

4. The slider brick of claim 1 wherein the particle size of each of the raw materials of the bottom layer is as follows:

aluminum powder: the granularity is less than or equal to 0.074 mm;

alumina micropowder: the particle size is less than or equal to 5 mu m;

bonding clay: the granularity is less than or equal to 0.074 mm;

asphalt powder: the granularity is less than or equal to 0.088 mm.

5. The sliding plate brick as claimed in any one of claims 1 to 4, wherein the aluminum powder in the surface layer material comprises the following powder materials with different particle sizes:

6. The sliding plate brick as claimed in claim 1, wherein in the composite resin binder, the mass ratio of the organic silicon resin to the phenolic resin is (1-2) to (3-4);

in the bottom layer raw material, the organic resin is phenolic resin;

7. The preparation method of the converter slag-stopping baking-free leaching-free composite slide plate brick as claimed in any one of claims 1 to 6, characterized by comprising the following steps:

a) mixing aggregate, surface fine powder premixed powder, a bonding agent and a fiber material to obtain a surface raw material;

the fine powder premixed powder is a mixed powder of fine powder;

d) drying the green brick to obtain a composite sliding plate brick;

wherein the step a) and the step b) are not limited in order.

8. The method according to claim 7, wherein the step a) comprises:

the step b) specifically comprises the following steps:

after the aggregate is dry-mixed, adding the bonding agent for mixing and grinding, and then adding the bottom fine powder for premixing and grinding to obtain the bottom raw material.

9. The method for preparing according to claim 7, wherein in the step c), the press-molding is performed by: carrying out double-sided pressure forming according to a sliding plate boss pre-feeding forming mode;

10. The preparation method according to claim 7 or 9, wherein the condition of the ageing is as follows: the temperature is 20-25 ℃, the humidity is 80-85%, and the time is 24-36 h;

the sieving is carried out by using an 8mm sieve;

the iron removal is strong magnetic iron removal;