Masonry structure of hot-metal bottle of industrial silicon submerged arc furnace

Abstract

The utility model belongs to the technical field of molten iron tanks, and particularly relates to a masonry structure of an industrial silicon submerged arc furnace molten iron tank. A masonry structure of a hot-metal bottle of an industrial silicon submerged arc furnace comprises a hot-metal bottle body, a plurality of protective layers formed by masonry of high-alumina bricks or silicon carbide bricks are arranged at the bottom in the hot-metal bottle body, and a core is placed in the center of each protective layer. A tank bottom castable layer is poured at the top of the protective layer; a tank wall castable layer is poured on the inner side wall of the hot metal tank body, and a tank wall protection layer formed by laying high-alumina bricks or silicon carbide bricks is arranged on the inner wall of the tank wall castable layer. The masonry structure layers in the whole hot-metal bottle body are matched with one another, so that the strength of the whole hot-metal bottle body can be enhanced, the service life of the hot-metal bottle body is prolonged, and the high temperature resistance and the corrosion resistance of the hot-metal bottle body are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of molten iron tanks, in particular to a masonry structure of an industrial silicon ore-fired furnace molten iron tank. Background Art

[0002] In the ferroalloy smelting industry, the molten iron tank is a container for liquid gold in the ferroalloy smelting process. The inside of the tank is equipped with high-temperature resistant materials. The current tank body adopts the integral casting and knotting masonry process. This process requires strict operating standards for the addition and baking of water when the raw materials are stirred, otherwise there will be a large amount of crystal water in the casting material. The use of coal or wood baking during the baking process of the platform is prone to vertical irregular cracks inside the platform casting material. During the use of the platform, it is easy to cause safety accidents such as the platform redness, leakage and leakage. Second, because the refining temperature outside the furnace after industrial silicon smelting is 1700℃, if the bottom oxygen blowing refining time is long, the platform built by the integral casting process has high requirements for the casting material. At present, the price of high-quality silicon carbide casting materials that meet this process is generally above 10,000 yuan / ton, which occupies a high cost for the company. Third, the integral masonry process is very easy to cause slag to accumulate during the furnace discharge process, resulting in serious slag accumulation on the ladle wall and the bottom of the ladle, which is difficult to clean, resulting in a small ladle capacity and affecting normal production and smelting. At the same time, the high temperature and long-term erosion of the tank wall during the mainstream of molten iron can easily cause erosion of the protective layer of refractory materials, resulting in high tank wall temperature and red tank wall, causing production accidents.

[0003] The utility model patent named "Blast furnace masonry molten iron tank" (publication number: CN205888059) discloses a molten iron tank, which changes the structure of the molten iron tank shell and sets a working layer lining on the inner wall of the molten iron tank shell; however, the working layer lining set in the molten iron tank is not strong enough, the protection of the molten iron tank is insufficient, and the service life is limited. Utility Model Content

[0004] The utility model provides a masonry structure of an industrial silicon ore-fired furnace molten iron tank, which has reasonable design, novel conception, convenient manufacture, safety and reliability, convenient construction, high strength and long service life.

[0005] The utility model is realized by the following technical solutions:

[0006] A masonry structure of an industrial silicon ore-fired furnace molten iron tank, comprising a molten iron tank body, wherein the inner bottom of the molten iron tank body is provided with a plurality of protective layers made of high-aluminum bricks or silicon carbide bricks, and a core is placed at the center of the protective layer; a tank bottom casting material layer is cast on the top of the protective layer; a tank wall casting material layer is cast on the inner side wall of the molten iron tank body, and a wall-filled protective layer made of high-aluminum bricks or silicon carbide bricks is provided on the inner wall of the tank wall casting material layer.

[0007] A tank top casting material layer is cast on the top of the molten iron tank body.

[0008] The tank bottom casting layer and the tank top casting layer are cast by corundum silicon carbide casting material; the tank wall casting layer is cast by high-aluminum refractory casting material.

[0009] A curing layer is arranged on the wall protection layer, and the curing layer is made of quartz sand, clay, bauxite and graphite powder.

[0010] The protective layer includes a first protective layer arranged in the body of the molten iron tank, a second protective layer is arranged on the first protective layer, and the first protective layer and the second protective layer are both built with high-aluminum bricks or silicon carbide bricks; the first protective layer and the second protective layer are built with staggered joints, and the gaps between the high-aluminum bricks or silicon carbide bricks are filled with refractory mud.

[0011] The first protective layer and the second protective layer are provided with cavities at their central parts for placing the core.

[0012] The gaps between the first protective layer, the second protective layer and the core are cast as a whole with corundum silicon carbide casting material.

[0013] The high-alumina bricks or silicon carbide bricks used to build the wall protection layer are knife-shaped bricks.

[0014] Beneficial effects of the utility model:

[0015] The utility model provides a protective layer formed by first-grade high-aluminum bricks or silicon carbide bricks at the bottom of the iron molten tank body, and a tank bottom casting material layer is poured on the top of the protective layer; a tank wall casting material layer is poured on the inner wall of the iron molten tank body, and a wall pouring protective layer formed by first-grade high-aluminum bricks or silicon carbide bricks is arranged on the tank wall casting material layer; the masonry structure layers inside the entire iron molten tank body cooperate with each other, which can enhance the strength of the entire iron molten tank body, and improve the service life of the iron molten tank body and its high temperature resistance and corrosion resistance;

[0016] The first protective layer and the second protective layer in the molten iron tank body of the utility model are both built by first-class high-aluminum bricks or silicon carbide bricks; the thickness of the masonry is uniform during the masonry, and the erosion resistance of slag and molten iron is relatively strong; the construction is convenient, the self-locking function can be produced, the pressure resistance is strong, and the strength of the entire molten steel tank is improved; during the masonry, the arc can be adjusted by moving, the masonry is staggered, and the gaps are filled with refractory mud, which can effectively avoid the phenomenon of iron seepage between brick joints;

[0017] The first protective layer and the second protective layer of the utility model are laid in a horizontally staggered manner, which can further improve the strength of the entire masonry structure and effectively prevent molten steel from entering. When the molten iron tank is filled with molten iron, the high-temperature molten iron and the bottom of the ladle are effectively insulated to avoid expansion and deformation of the ladle shell caused by long-term high-temperature baking, thereby increasing the service life of the molten iron ladle.

[0018] The utility model has a tank top pouring material layer cast on the top of the molten iron tank body, which can effectively protect the top of the molten iron tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the first-level high-alumina brick or silicon carbide brick for masonry protective layer of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the first-level high-alumina brick or silicon carbide brick for masonry and pouring wall protection layer of the utility model;

[0022] In the figure: 1-first protective layer, 2-second protective layer, 3-core coating, 4-bottom casting layer, 5-wall casting layer, 6-wall protection layer, 7-top casting layer, 8-curing layer, 9-hot metal tank body, 10-cavity. DETAILED DESCRIPTION

[0023] See also Figure 1 A masonry structure of an industrial silicon ore-fired furnace molten iron tank, comprising a molten iron tank body 9, wherein the inner bottom of the molten iron tank body 9 is provided with several layers of protective layers formed by first-grade high-aluminum bricks or silicon carbide bricks, and a core 3 is placed at the center of the protective layer; a tank bottom casting material layer 4 is cast on the top of the protective layer; a tank wall casting material layer 5 is cast on the inner side wall of the molten iron tank body 9, and a wall protection layer 6 formed by first-grade high-aluminum bricks or silicon carbide bricks is provided on the inner wall of the tank wall casting material layer 5.

[0024] A tank top casting material layer 7 is cast on the top of the molten iron tank body 9 to strengthen the protection of the top of the molten iron tank body 9 and prevent the high-temperature molten iron from corroding the top of the molten iron tank body 9.

[0025] The tank bottom casting layer 4 and the tank top casting layer 7 are casted by corundum silicon carbide casting material; the tank wall casting layer 5 is casted by high-aluminum refractory casting material.

[0026] A curing layer 8 is provided on the wall protection layer 6, and the curing layer 8 is made of quartz sand, clay, bauxite, and graphite powder. The curing layer 8 further protects the wall protection layer 6.

[0027] The protective layer includes a first protective layer 1 arranged in the molten iron tank body 9, and a second protective layer 2 is arranged on the first protective layer 1. The first protective layer 1 and the second protective layer 2 are both built with first-level high-aluminum bricks or silicon carbide bricks; the first protective layer 1 and the second protective layer 2 are built with staggered joints, and the gaps between the first-level high-aluminum bricks or silicon carbide bricks are filled with refractory mud.

[0028] The first protective layer 1 and the second protective layer 2 are provided with a cavity 10 at the center thereof for placing the core 3. The gaps between the first protective layer 1, the second protective layer 2 and the core 3 are cast as a whole by corundum silicon carbide casting material.

[0029] The first-grade high-alumina bricks or silicon carbide bricks used to build the wall protection layer 6 are knife-shaped bricks.

[0030] Specifically, the molten iron tank body 9 is welded by steel plates, and the molten iron tank body 9 includes a tank bottom and a tank wall. The surface of the bottom of the molten iron tank body 9 is paved with first-grade high-aluminum bricks or silicon carbide bricks to form a first protective layer 1, and the surface of the first protective layer 1 is paved with first-grade high-aluminum bricks or silicon carbide bricks to form a second protective layer 2 as a permanent layer, and a core 3 (air permeable brick) is placed in the center of the second protective layer 2; the tank wall of the molten iron tank body 9 is fixedly provided with a tank wall castable layer 5, and the side wall surface of the tank wall castable layer 5 is formed by a wall protection layer 6 built with first-grade high-aluminum bricks or silicon carbide bricks; the side wall surface of the wall protection layer 6 is provided with a curing layer 8; after the wall protection layer 6 is built, the castable is knotted on the upper part of the molten iron tank body 9 to form a tank top castable layer 7 for sealing.

[0031] The total thickness of the first protective layer 1 and the second protective layer 2 is 130 mm. The function is: the permanent layer at the bottom of the pouring plays a role in heat insulation between the high-temperature molten iron and the ladle. The silicon carbide castable is knotted on the upper part of the first-level high-alumina brick to ensure that the high-temperature molten iron heats the ladle for a long time, causing the cladding to expand and deform.

[0032] The thickness of the tank wall casting material layer 5 is 50mm. The high-aluminum refractory castable is used as the permanent layer of the filling bag wall. The material is high-aluminum high-strength refractory castable, which has the characteristics of high compressive strength and high volume stability under high temperature; small volume density, strong resistance to slag erosion and permeability, refractoriness can reach 1700~1750℃, excellent thermal shock resistance, good resistance in rapid cooling and heating environment, and can also resist chemical erosion by acidic slag or solution; and the construction process is convenient, and it can be directly cast into an integral lining; the high-aluminum castable has a low procurement cost, and the safety factor is high after making the permanent layer. The permanent layer can be used all year round, which can greatly reduce the operation and maintenance costs.

[0033] The wall protection layer 6 is constructed with first-grade high-alumina bricks or silicon carbide bricks (knife-shaped bricks) to build the tank wall castable layer 5. The knife-shaped bricks are built vertically with a thickness of 114 mm. The wall protection layer 6, as an erosion layer, can effectively protect the tank wall castable layer 5 from damage, and can improve the safe operation of the molten iron tank body 9. When the subsequent wall protection layer 6 is eroded to 20MM, it is easy to remove and replace, and the price is low.

[0034] The thickness of the curing layer 8 is 20 mm; its function is to prevent the erosion layer of the molten iron tank from being damaged. The curing layer needs to be supplemented during offline repair, which reduces the cost of repairing the molten iron tank, shortens the repair cycle, and increases the online utilization rate and service life of the molten iron tank. It has the advantages of low maintenance cost, simple maintenance process, and simple baking.

[0035] A masonry process for a masonry structure of an industrial silicon ore-fired furnace molten iron tank comprises the following steps:

[0036] S1, first-grade high-alumina bricks or silicon carbide bricks are baked at 1350℃ for use;

[0037] S2. The surface of the bottom of the molten iron tank body 9 is built with a first protective layer 1 of first-grade high-aluminum bricks or silicon carbide bricks, and the surface of the first protective layer 1 is built with a second protective layer 2 of first-grade high-aluminum bricks or silicon carbide bricks, and a cavity 10 is reserved at the center of the second protective layer 2 for placing the core 3; the cavity 10 is cast with corundum silicon carbide castable and the tank bottom castable layer 4 is cast, and the upper end surface of the tank bottom castable layer 4 is flush with the upper end surface of the core 3; the tank bottom castable layer 4 is naturally cured for at least 12 hours;

[0038] S3, after placing the mold on the inner wall of the molten iron tank body 9, cast the tank wall casting material layer 5 with high aluminum refractory castable, the thickness of the tank wall casting material layer 5 is 45-65mm, and the distance between the upper end of the tank wall casting material layer 5 and the top of the molten iron tank body 9 is kept at more than 200mm, and naturally cured for more than 24 hours, and then take out the mold; on the side wall surface of the tank wall casting material layer 5, a pouring wall protection layer 6 is built with a first-class high aluminum brick or silicon carbide brick; after the pouring wall protection layer 6 is built, place the mold on the upper end of the molten iron pouring, and use corundum silicon carbide castable castable tank top casting material layer 7 for blocking;

[0039] S4, remove the mold and apply a curing layer of more than 820mm on the pouring wall protective layer 6;

[0040] S5. The molten iron tank body 9 is baked for more than 72 hours, and the temperature inside the tank reaches more than 600° C. and is maintained for 12 hours before being put into use.

Claims

1. A masonry structure for an industrial silicon ore-fired furnace molten iron tank, comprising a molten iron tank body (9), Features: The inner bottom of the molten iron tank body (9) is provided with a plurality of protective layers made of first-grade high-aluminum bricks or silicon carbide bricks, and a core (3) is placed at the center of the protective layer; a tank bottom casting material layer (4) is cast on the top of the protective layer; a tank wall casting material layer (5) is cast on the inner side wall of the molten iron tank body (9), and a wall protection layer (6) made of first-grade high-aluminum bricks or silicon carbide bricks is provided on the inner wall of the tank wall casting material layer (5).

2. The masonry structure of the molten iron tank of an industrial silicon ore-fired furnace according to claim 1, Features: A tank top casting material layer (7) is cast on the top of the molten iron tank body (9).

3. The masonry structure of the molten iron tank of an industrial silicon ore-fired furnace according to claim 2, Features: The tank bottom casting material layer (4) and the tank top casting material layer (7) are casted from corundum silicon carbide casting material; and the tank wall casting material layer (5) is casted from high-aluminum refractory casting material.

4. The masonry structure of the molten iron tank of an industrial silicon ore-fired furnace according to claim 3, Features: A curing layer (8) is provided on the wall protection layer (6), and the curing layer (8) is made of quartz sand, clay, bauxite, and graphite powder.

5. The masonry structure of the molten iron tank of an industrial silicon ore-fired furnace according to claim 1, Features: The protective layer comprises a first protective layer (1) arranged in the molten iron tank body (9), a second protective layer (2) being arranged on the first protective layer (1), the first protective layer (1) and the second protective layer (2) both being built with first-grade high-alumina bricks or silicon carbide bricks; the first protective layer (1) and the second protective layer (2) being built with staggered joints, and the gaps between the first-grade high-alumina bricks or silicon carbide bricks being filled with refractory mud.

6. The masonry structure of the molten iron tank of an industrial silicon ore-fired furnace according to claim 5, Features: The first protective layer (1) and the second protective layer (2) are provided at their central locations with a cavity (10) for accommodating the core (3).

7. The masonry structure of the molten iron tank of an industrial silicon ore-fired furnace according to claim 6, Features: The gaps between the first protective layer (1), the second protective layer (2) and the core (3) are cast as a whole using corundum silicon carbide castable material.

8. The masonry structure of the molten iron tank of an industrial silicon ore-fired furnace according to claim 1, Features: The first-grade high-alumina bricks or silicon carbide bricks used to build the wall protection layer (6) are knife-shaped bricks.

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