Iron notch duct castable for treating iron notch splashing and application of iron notch duct castable

Abstract

The invention relates to the technical field of blast furnace ironmaking, and particularly discloses an iron notch duct castable for treating iron notch splashing and application of the iron notch duct castable. The iron notch channel castable comprises the following components in parts by weight: 50-70 parts of titanium oxide composite corundum, 2-10 parts of silicon powder, 2-10 parts of titanium powder, 5-15 parts of ferro-silicon nitride powder, 3-5 parts of carbon black, 0.2-0.5 part of azoamide, 3-5 parts of bentonite, 8-15 parts of a composite binding agent and 0.1-0.5 part of a composite water reducing agent. The titanium oxide composite corundum comprises titanium oxide composite corundum with the particle size of 3-5mm, titanium oxide composite corundum with the particle size of 1-3mm, titanium oxide composite corundum with the particle size of 0.2-1mm and titanium oxide composite corundum with the particle size of less than or equal to 0.074 mm. The iron notch duct castable provided by the invention has good self-repairing capability, and can repair cracks in iron notch ducts and block blast furnace gas leakage, thereby realizing treatment of iron notch splashing.

Description

Technical Field

[0001] The present application relates to the technical field of blast furnace ironmaking, and in particular to an iron mouth channel castable for controlling iron mouth splashing and an application thereof. Background Art

[0002] During the blast furnace ironmaking process, when there are gaps between the blast furnace wall bricks, the furnace shell and the cooling wall, and between the carbon bricks and the cooling wall, the blast furnace gas is likely to leak to the taphole, causing taphole splashing. Especially after the blast furnace is overhauled, taphole splashing is particularly serious. This phenomenon will not only lead to the deterioration of the furnace environment, increase the workload of the workers in front of the furnace, but also reduce the service life of the main iron ditch. Therefore, how to effectively control taphole splashing has become an urgent problem to be solved in the ironmaking industry.

[0003] There are two main ways to control the splashing of the iron mouth in the prior art: one is to accurately press the repair material into the crack position by grouting, so as to achieve control at the source; however, this method has the disadvantages of being difficult to accurately grasp the effective opening position, occasional recurrence of splashing after control, and strict control of the pressure during implementation, so it is difficult to operate and cannot be widely promoted and used; the other is to use anti-splashing taphole mud to control the end of the iron mouth splashing. This method has the advantages of quick and simple construction and low cost, but its control effect is very limited, and there is a problem of easy recurrence of splashing, and it is necessary to frequently replace the taphole mud to ensure a good control effect. Obviously, both of the existing methods have certain limitations and cannot completely solve the problem of iron mouth splashing. Especially in the early stage after the blast furnace overhaul, due to the large gaps between the furnace wall bricks, the furnace shell and the cooling wall, the splashing phenomenon is more serious.

[0004] Therefore, there is an urgent need for a new method and technology that can effectively control iron mouth splashing. Summary of the invention

[0005] In order to overcome the problems of high operating difficulty and poor control effect in the existing methods for controlling iron mouth splashing, the present application provides an iron mouth channel castable for controlling iron mouth splashing and its application.

[0006] In a first aspect, the present application provides a castable for a taphole channel for treating taphole splashing, which adopts the following technical solution: A castable for a taphole channel for treating taphole splashing, comprising the following components in parts by weight: 50-70 parts of titanium oxide composite corundum, 2-10 parts of silicon powder, 2-10 parts of titanium powder, 5-15 parts of ferrosilicon nitride powder, 3-5 parts of carbon black, 0.2-0.5 parts of azoamide, 3-5 parts of bentonite, 8-15 parts of a composite binder and 0.1-0.5 parts of a composite water reducer; The titanium oxide composite corundum includes titanium oxide composite corundum with a particle size of 3-5 mm, titanium oxide composite corundum with a particle size of 1-3 mm, titanium oxide composite corundum with a particle size of 0.2-1 mm, and titanium oxide composite corundum with a particle size of ≤0.074 mm; The composite binder is Cyc-Z and ρ-Al 2 O 3 mixture.

[0007] The present application provides a castable for a duct of an iron mouth for treating iron mouth splashing. The castable has excellent fluidity, suspension and explosion-proof properties, and can smoothly fill the tiny gaps in the duct of the iron mouth to ensure uniform distribution of the material. At the same time, the castable also has excellent scouring resistance, bonding strength and thermal shock resistance, so that it can work stably for a long time in a high temperature environment, and can still maintain structural integrity under the condition of rapid temperature changes, effectively avoiding the generation of gaps caused by scouring. In addition, the castable also has good self-repairing ability, which can promptly repair the cracks generated inside the duct of the iron mouth, prolong the duration of the treatment effect, and effectively prevent the recurrence of splashing.

[0008] In this application, the titanium oxide composite corundum powder has a high Ti 2 O 3 and a-Al 2 O 3 On the one hand, the content can be used as part of the titanium source, greatly reducing the cost of raw materials; on the other hand, Ti 2 O 3 Can react with N in blast furnace gas 2 ,CO,CO 2 The reaction generates TiC and TiN, which effectively repair the cracks and gaps in the iron mouth channel, prevent further leakage of coal gas, and thus inhibit iron mouth splashing; in addition, a-Al 2 O 3 It has a low water absorption rate, can improve the strength, density and thermal shock resistance of the castable, and effectively avoid cracks in the iron mouth. Silicon nitride iron powder and carbon black can generate SiC at high temperature, improve the bonding strength of the matrix, and release N 2 Ti 2 O 3The carbon black provides an initial nitrogen source for the formation of TiN, and the carbon black also provides an initial carbon source for the metal silicon to form SiC, thereby strengthening the castable and compensating for its own crack defects in advance when there is no blast furnace gas leakage to the iron mouth channel. Silicon powder can react with CO in blast furnace gas to form silicon carbide, which is resistant to high temperature, corrosion, and erosion, and can effectively resist the erosion and wear of blast furnace gas. In addition, the silicon carbide whisker network structure can also penetrate the interior of the castable, improving the bonding strength; in addition, silicon powder has a certain expansion after absorbing C, which can compensate for the cracks in the iron mouth channel and prevent blast furnace gas leakage. Titanium powder can react with N in blast furnace gas. 2 ,CO,CO 2 The reaction produces TiC and TiN. When the gas leakage is very small, it can repair the cracks in the duct and inhibit the crack expansion. At the same time, the volume of metal Ti will expand after absorbing C or N, which can fill the gaps and cracks in the iron mouth duct. Azoamide can produce N after decomposition. 2 , can be metal Ti and Ti 2 O 3 The formation of TiN provides an initial nitrogen source; in addition, the N released during the casting process 2 It is possible to form tiny pores with an aperture of about 10 μm in the castable, and such tiny pores have both good explosion-proof effect and can minimize the structural degradation caused by the pores. Bentonite has excellent plasticity. Adding it to the castable can increase its consistency, maintain the suspension of the castable, prevent the sedimentation of the granular material, and ensure the uniformity of the castable after pouring, so as not to affect the reaction between the components. The composite binder can improve the bonding strength of the iron mouth pores, and can expand slightly, thereby filling the micro-gaps of the iron mouth pores and preventing blast furnace gas leakage. In summary, the iron mouth pore castable provided in the present application has good self-repairing properties on the one hand, can repair cracks and gaps in the iron mouth pores, and prevent further leakage of gas, thereby significantly reducing the iron mouth splashing phenomenon; on the other hand, it also has good density and mechanical properties, can effectively resist the erosion and wear of blast furnace gas, effectively avoid cracks in the iron mouth, and thus achieve the purpose of preventing iron mouth splashing.

[0009] The present application adopts titanium oxide composite corundum of different particle sizes for compounding, and the obtained iron mouth channel castable has high strength and good density, can effectively resist blast furnace gas erosion and prevent gas from flowing into the iron mouth channel, thereby suppressing iron mouth splashing.

[0010] In this application, by using Cyc-Z and ρ-Al 2 O 3 As a composite binder, compared with the conventional cement binder in the related art, it can avoid the introduction of calcium ions to generate low-melting-point substances such as chalcedony. In addition, at high temperatures, SiO 2 Cyclic acid-Z and Al2 O 3 Main component ρ-Al 2 O 3 The reaction can generate mullite with a fiber network structure. On the one hand, the network structure can improve the bonding strength of the iron mouth pores. On the other hand, the above reaction process has micro-expansion, which can fill the micro-cracks in the iron mouth pores and further prevent blast furnace gas leakage.

[0011] Optionally, the weight ratio of the titanium oxide composite corundum with a particle size of 3-5 mm, the titanium oxide composite corundum with a particle size of 1-3 mm, the titanium oxide composite corundum with a particle size of 0.2-1 mm and the titanium oxide composite corundum with a particle size ≤0.074 mm is 1:(0.8-1.2):(0.5-0.9):(0.5-0.9).

[0012] In some embodiments, the weight ratio of the titanium oxide composite corundum with a particle size of 3-5 mm, the titanium oxide composite corundum with a particle size of 1-3 mm, the titanium oxide composite corundum with a particle size of 0.2-1 mm, and the titanium oxide composite corundum with a particle size ≤0.074 mm can be 1:(0.8-1.2):(0.5-0.9):(0.5-0.9).

[0013] In a specific embodiment, the weight ratio of the titanium oxide composite corundum with a particle size of 3-5 mm, the titanium oxide composite corundum with a particle size of 1-3 mm, the titanium oxide composite corundum with a particle size of 0.2-1 mm and the titanium oxide composite corundum with a particle size ≤0.074 mm can also be 1:(0.8-1):0.7:0.7, 1:(1-1.2):0.7:0.7, 1:1:(0.5-0.7):0.7, 1:1:(0.7-0.9):0.7, 1:1:0.7:(0.5-0.7) or 1:1:0.7:(0.7-0.9).

[0014] Optionally, the weight ratio of the titanium oxide composite corundum with a particle size of 3-5 mm, the titanium oxide composite corundum with a particle size of 1-3 mm, the titanium oxide composite corundum with a particle size of 0.2-1 mm and the titanium oxide composite corundum with a particle size ≤0.074 mm is 1:0.8:0.7:0.7, 1:1:0.7:0.7, 1:1.2:0.7:0.7, 1:1:0.5:0.7, 1:1:0.9:0.7, 1:1:0.7:0.5 or 1:1:0.7:0.9.

[0015] Optionally, the Cyc-Z and ρ-Al 2 O 3 The weight ratio is 1:(1.1-3.4).

[0016] In some embodiments, the Cyc-Z and p-Al 2 O3 The weight ratio can be 1:(1.1-1.6), 1:(1.1-2.2), 1:(1.1-2.8), 1:(1.6-2.2), 1:(1.6-2.8), 1:(1.6-3.4), 1:(2.2-2.8), 1:(2.2-3.4) or 1:(2.8-3.4).

[0017] In a specific embodiment, the Cyc-Z and p-Al 2 O 3 The weight ratio can also be 1:1.1, 1:1.6, 1:2.2, 1:2.8 or 1:3.4.

[0018] Optionally, the Cyc-Z and ρ-Al 2 O 3 The weight ratio is 1:(1.6-2.8).

[0019] Optionally, the weight portion of the titanium oxide composite corundum is 55-65 parts, and the weight portion of the composite binder is 10-13 parts.

[0020] In some embodiments, the weight proportion of the titanium oxide composite corundum may be 50-55 parts, 50-60 parts, 50-65 parts, 55-60 parts, 55-65 parts, 55-70 parts, 60-65 parts, 60-70 parts or 65-70 parts.

[0021] In a specific embodiment, the weight proportion of the titanium oxide-composite corundum may also be 50 parts, 55 parts, 60 parts, 65 parts or 70 parts.

[0022] In some embodiments, the weight proportion of the composite binder may be 8-10 parts, 8-13 parts, 10-13 parts, 10-15 parts, or 13-15 parts.

[0023] In a specific embodiment, the weight proportion of the composite binder can also be 8 parts, 10 parts, 13 parts or 15 parts.

[0024] Optionally, the iron mouth channel castable includes the following components in parts by weight: 60 parts of titanium oxide composite corundum, 6 parts of silicon powder, 6 parts of titanium powder, 10 parts of ferrosilicon nitride powder, 4 parts of carbon black, 0.4 parts of azoamide, 4 parts of bentonite, 13 parts of composite binder and 0.3 parts of composite water reducer.

[0025] In a second aspect, the present application provides a technology for controlling iron mouth splashing, which adopts the iron mouth channel castable.

[0026] Optionally, the technology for controlling iron mouth splashing comprises the following steps: when the blast furnace is shut down for overhaul, the residual lining of the iron mouth channel is removed, the removal depth is to the entire iron mouth channel, and the removal thickness is the part with a diameter of 500mm to 600mm centered on the iron mouth in the circumferential direction; a circular arc baffle with the same diameter as the blast furnace is fixed at the iron mouth channel in the furnace, and the gap between the baffle and the blast furnace lining is filled with water cannon mud; a circular arc baffle is fixed at the iron mouth outside the blast furnace, a pouring hole is set on the upper part of the baffle, and the pouring hole The size is 500×500mm, the radius of the baffle is the same as that of the blast furnace shell, and the gap between the baffle and the shell is filled with water cannon mud; then the iron mouth channel castable with a fluidity of 130-140mm is poured in from the pouring hole, and the exhaust is vibrated with a vibrating rod, and the vibrating is performed while pouring to the upper edge of the baffle; after the iron mouth channel castable is solidified, the two baffles are removed; natural curing ≥3h, baking at 110-150℃ ≥2h, baking at 370-450℃ ≥5h, baking at 750-800℃ ≥5h.

[0027] Optionally, the technology for controlling iron mouth splashing comprises the following steps: when repairing the blast furnace air or the main iron groove, the residual lining of the iron mouth channel is removed, the removal depth is 500-600 mm from the center line of the iron mouth outside the furnace to the furnace, and the part with a diameter of 500-600 mm with the center of the iron mouth as the center in the circumferential direction is removed; a circular arc baffle is fixed at the iron mouth outside the blast furnace, a pouring hole is set on the upper part of the baffle, the pouring hole size is 500×500 mm, and the arc diameter of the baffle is the same as the blast furnace shell; Similarly, the side length of the baffle is ≥1000×1000mm, and the gap between the baffle and the furnace shell is filled with water cannon mud; then the iron mouth channel castable with a fluidity of 130-140mm is poured in from the pouring hole, and the exhaust is vibrated with a vibrating rod, and the vibrating is performed while pouring to the upper edge of the baffle; the baffle is removed after the iron mouth channel castable is solidified; natural curing ≥30min, baking at 110-150℃ for ≥1h, baking at 370-450℃ for ≥2h, and baking at 750-800℃ for ≥1h.

[0028] In summary, this application has the following beneficial effects: 1. The present application adopts titanium oxide composite corundum, silicon powder, titanium powder, silicon nitride iron powder, etc. to prepare a iron mouth channel castable with self-repairing, erosion resistance, bonding strength and thermal shock resistance. The iron mouth channel castable can prevent and suppress iron mouth splashing, and realize efficient control of iron mouth splashing.

[0029] 2. In the present application, the particle size of titanium oxide composite corundum is adjusted, and its particle size and ratio are further controlled within the following range: the weight ratio of titanium oxide composite corundum with a particle size of 3-5mm, titanium oxide composite corundum with a particle size of 1-3mm, titanium oxide composite corundum with a particle size of 0.2-1mm and titanium oxide composite corundum with a particle size ≤0.074mm is 1:(0.8-1.2):(0.5-0.9):(0.5-0.9). The obtained iron mouth channel castable has good density and excellent mechanical properties. When used for the iron mouth channel, it can effectively resist blast furnace gas erosion and prevent gas from flowing into the iron mouth channel, thereby suppressing iron mouth splashing.

[0030] 3. This application uses Cyclic-Z and ρ-Al 2 O 3 As a composite binder, on the one hand, it can improve the bonding strength of the iron mouth pores and resist the erosion and wear of blast furnace gas; on the other hand, it can also fill the micro cracks in the iron mouth pores to further prevent blast furnace gas leakage.

[0031] 4. The present application provides a technology for controlling iron mouth splashing. The technology for controlling iron mouth splashing prepares a high-performance iron mouth channel by pouring the iron mouth channel castable into the middle stage of the splashing process (between the source of blast furnace gas leakage to the end), thereby blocking the splashing gas from leaking to the iron mouth. The technology is simple, flexible and safe to construct and can achieve better control effects. It is a cost-effective method for controlling iron mouth splashing. DETAILED DESCRIPTION

[0032] The present application provides a castable for a taphole channel for treating taphole splashing, characterized in that it comprises the following components in parts by weight: 50-70 parts of titanium oxide composite corundum, 2-10 parts of silicon powder, 2-10 parts of titanium powder, 5-15 parts of ferrosilicon nitride powder, 3-5 parts of carbon black, 0.2-0.5 parts of azoamide, 3-5 parts of bentonite, 8-15 parts of composite binder and 0.1-0.5 parts of composite water reducer; further, the weight part of the titanium oxide composite corundum is 55-65 parts, and the weight part of the composite binder is 10-13 parts; The titanium oxide composite corundum includes titanium oxide composite corundum with a particle size of 3-5 mm, titanium oxide composite corundum with a particle size of 1-3 mm, titanium oxide composite corundum with a particle size of 0.2-1 mm and titanium oxide composite corundum with a particle size of ≤0.074 mm; the composite binder is Sec-Z and ρ-Al 2 O 3A mixture of: further, the weight ratio of the titanium oxide composite corundum with a particle size of 3-5 mm, the titanium oxide composite corundum with a particle size of 1-3 mm, the titanium oxide composite corundum with a particle size of 0.2-1 mm and the titanium oxide composite corundum with a particle size of ≤0.074 mm is 1: (0.8-1.2): (0.5-0.9): (0.5-0.9); the Sai Ke-Z and ρ-Al 2 O 3 The weight ratio is 1:(1.1-3.4).

[0033] The present application also provides a technology for controlling iron mouth splashing, comprising the following steps: when the blast furnace is shut down for overhaul, the residual lining of the iron mouth channel is removed, the removal depth is to the entire iron mouth channel, and the circumferential direction is the part with a diameter of 500mm to 600mm centered on the iron mouth; a circular arc baffle with the same diameter as the blast furnace is fixed at the iron mouth channel in the furnace (the gap with the blast furnace lining is minimized as much as possible), the side length of the baffle is ≥1000×1000mm, and the gap between the baffle and the blast furnace lining is filled with water cannon mud; a circular arc baffle is fixed at the iron mouth outside the blast furnace, and a pouring hole is arranged on the upper part of the baffle, The size of the pouring hole is 500×500mm, the radius of the baffle is the same as that of the blast furnace shell, the side length of the baffle is ≥1000×1000mm, and the gap between the baffle and the shell is filled with water cannon mud; then the iron mouth channel castable with a fluidity of 130-140mm is poured into the pouring hole, and the exhaust is vibrated with a vibrating rod, and vibrated while pouring to the upper edge of the baffle; after the iron mouth channel castable is solidified, the two baffles are removed; after natural curing for ≥3h, it is baked at 110-150℃ for ≥2h, 370-450℃ for ≥5h, and 750-800℃ for ≥5h.

[0034] The present application also provides a technology for controlling iron mouth splashing, comprising the following steps: when repairing the blast furnace air or the main iron groove, removing the residual lining of the iron mouth channel, the removal depth is from the outside of the furnace along the iron mouth center line to the furnace to 500-600mm, and removing the part with a diameter of 500mm-600mm with the iron mouth center as the center in the circumferential direction; fixing an arc-shaped baffle at the iron mouth outside the blast furnace, a pouring hole is set on the upper part of the baffle, the pouring hole size is 500×500mm, and the arc diameter of the baffle is the same as the diameter of the blast furnace. The shell is the same, the side length of the baffle is ≥1000×1000mm, and the gap between the baffle and the furnace shell is filled with water cannon mud; then the iron mouth channel castable with a fluidity of 130-140mm is poured in from the pouring hole, and the exhaust is vibrated with a vibrating rod, and the vibrating is performed while pouring to the upper edge of the baffle; the baffle is removed after the iron mouth channel castable is solidified; natural curing ≥30min, baking at 110-150℃ for ≥1h, baking at 370-450℃ for ≥2h, and baking at 750-800℃ for ≥1h.

[0035] The raw materials used in the examples of this application are as follows: Titanium oxide composite corundum is made of waste slag from smelting titanium iron alloy, alumina and slag-making agent as raw materials, and is obtained by electric melting in an electric furnace to remove impurities. 2 O 3 The content is 17%, a-Al 2 O 3 The composite material with a content of 72% is then crushed into different particle sizes. The particle sizes of titanium oxide composite corundum in this application are 3-5mm, 1-3mm, 0.2-1mm and ≤0.074mm; The silicon content of silicon powder is ≥98%, and the particle size is ≤0.044mm; The titanium content of titanium powder is ≥99% and the particle size is ≤0.044mm; Ferro Silicon Nitride Powder Si 3 N 4 The content is 77%, and the Fe content is 14%; The model of carbon black is N990R, ash content ≤ 0.5%, 0.045mm sieve residue ≤ 0.08%; Azodicarbonamide is industrial grade, particle size ≤ 0.074 mm; The bentonite model is YBK L-3 produced by Kefumin Company, SiO 2 Content ≥73%; Al 2 O 3 Content ≥13%, particle size ≤0.074mm; Cyclic-Z, purchased from Elkem, Al 2 O 3 Content 25~40%, SiO 2 Content 55~75%; ρ-Al 2 O 3 Medium Al 2 O 3 Content ≥90%, ρ-Al 2 O 3 Content ≥80%, average particle size D50 is 1~5μm; The composite water reducer is a mixture of SP73 water reducer and sodium polyacrylate water reducer produced by Wuhan Shanda Chemical Co., Ltd. in a weight ratio of 1:1. The raw materials, reagents, solvents, etc. used in this application can all be obtained commercially.

[0036] The present application is further described in detail below in conjunction with embodiments and performance testing experiments.

[0037] Examples 1-9 Embodiments 1-9 respectively provide a castable for an iron mouth channel.

[0038] The difference between the above embodiments is that the weight ratio of titanium oxide composite corundum with different particle sizes in the iron mouth channel castable is specifically shown in Table 1 below.

[0039] The preparation method of the iron mouth channel castable provided in Examples 1-9 is as follows: (1) First, titanium oxide composite corundum was prepared according to the weight ratio shown in Table 1; (2) Weigh 6 kg of titanium oxide composite corundum, 0.6 kg of silicon powder, 0.6 kg of titanium powder, 1 kg of ferrosilicon nitride powder, 0.4 kg of carbon black, 0.04 kg of azodicarbonamide, 0.4 kg of bentonite, and 1.3 kg of composite binder (the weight ratio of 1:2.2 of Sec-Z and ρ-Al 2 O 3 ) and composite water reducing agent 0.03kg; (3) Mix and stir the above raw materials for 15 minutes to obtain the iron mouth channel castable.

[0040] Table 1 Weight ratio of titanium oxide composite corundum with different particle sizes in the iron mouth channel castable of Examples 1-9 Examples 10-13 Embodiments 10-13 respectively provide a kind of iron mouth channel castable.

[0041] The difference between the above embodiment and embodiment 2 is: the type and ratio of the composite binder, as shown in Table 2 below.

[0042] Table 2 Types and proportions of composite binders in the iron mouth channel castables provided in Examples 10-13 Example Types and ratios of composite binders 2 <![CDATA[The weight ratio of Saike-Z and ρ-Al is 1:2.2 2 O 3 > 10 <![CDATA[SaiKe-Z and ρ-Al with a weight ratio of 1:1.1 2 O 3 > 11 <![CDATA[The weight ratio of Saike-Z and ρ-Al is 1:1.6 2 O 3 > 12 <![CDATA[The weight ratio of Saike-Z and ρ-Al is 1:2.8 2 O 3 > 13 <![CDATA[The weight ratio of Saike-Z and ρ-Al is 1:3.4 2 O 3 > Examples 14-20 Embodiments 14-20 provide a kind of iron mouth channel castable respectively.

[0043] The difference between the above embodiment and embodiment 2 is that the addition amounts of titanium oxide composite corundum and composite binder are specifically shown in Table 3 below.

[0044] Table 3 Addition amount of titanium oxide composite corundum and composite binder in Examples 14-20 Comparative Example 1 Comparative Example 1 provides a castable for an iron mouth channel.

[0045] The difference between the comparative example and Example 2 is that the titanium oxide composite corundum used in the iron mouth channel castable does not contain titanium oxide composite corundum with a particle size of 3-5 mm.

[0046] The titanium oxide composite corundum used in Comparative Example 1 is: titanium oxide composite corundum with a particle size of 1-3 mm, titanium oxide composite corundum with a particle size of 0.2-1 mm, and titanium oxide composite corundum with a particle size ≤0.074 mm in a weight ratio of 1:0.7:0.7.

[0047] Comparative Example 2 Comparative Example 2 provides a castable for an iron mouth channel.

[0048] The difference between the comparative example and Example 2 is that the titanium oxide composite corundum used in the iron mouth channel castable does not contain titanium oxide composite corundum with a particle size of 1-3 mm.

[0049] The titanium oxide composite corundum used in Comparative Example 2 is: titanium oxide composite corundum with a particle size of 3-5 mm, titanium oxide composite corundum with a particle size of 0.2-1 mm, and titanium oxide composite corundum with a particle size ≤0.074 mm in a weight ratio of 1:0.7:0.7.

[0050] Comparative Example 3 Comparative Example 3 provides a castable for an iron mouth channel.

[0051] The difference between the comparative example and Example 2 is that the titanium oxide composite corundum used in the iron mouth channel castable does not contain titanium oxide composite corundum with a particle size of 0.2-1 mm.

[0052] The titanium oxide composite corundum used in Comparative Example 3 is: titanium oxide composite corundum with a particle size of 3-5 mm, titanium oxide composite corundum with a particle size of 1-3 mm, and titanium oxide composite corundum with a particle size of ≤0.074 mm in a weight ratio of 1:1:0.7.

[0053] Comparative Example 4 Comparative Example 4 provides a castable for an iron mouth channel.

[0054] The difference between the comparative example and Example 2 is that the titanium oxide composite corundum used in the iron mouth channel castable does not contain titanium oxide composite corundum with a particle size of ≤0.074 mm.

[0055] The titanium oxide composite corundum used in Comparative Example 4 is: titanium oxide composite corundum with a particle size of 3-5 mm, titanium oxide composite corundum with a particle size of 1-3 mm, and titanium oxide composite corundum with a particle size of 0.2-1 mm in a weight ratio of 1:1:0.7.

[0056] Comparative Example 5 Comparative Example 5 provides a castable for an iron mouth channel.

[0057] The difference between the comparative example and Example 2 is that the amount of Cyc-Z added is 0.

[0058] Comparative Example 6 Comparative Example 6 provides a castable for an iron mouth channel.

[0059] The difference between the comparative example and Example 2 is that: 2 O 3 The amount added is 0.

[0060] Performance testing The performance test of the iron mouth channel castables provided in Examples 1-20 and Comparative Examples 1-6 was carried out, and the specific operation was as follows.

[0061] (1) Add water to the iron mouth channel castable until the flow value reaches 120-130 mm, stir evenly, and then pour into a 40×40×160 mm mold, and demold after curing at room temperature for 24 h; prepare two casting samples in parallel for each iron mouth channel castable, and then bake one casting sample at 110°C for 24 h (condition ①), and bake the other casting sample at 110°C for 24 h, and then bury it in charcoal at 1450°C for 3 h (condition ②).

[0062] (2) The bulk density and compressive strength of each cast sample were tested according to GB / T4513.6 standard. The results are shown in Table 4 below. Bulk density refers to the mass of a material per unit volume. The larger the bulk density, the better the density of the material. Compressive strength refers to the maximum load that a material can withstand per unit area without deformation or rupture.

[0063] Table 4 Performance test results of the iron mouth channel castables provided by Examples 1-20 and Comparative Examples 1-6 According to the test results in Table 4, the volume density of the iron mouth channel castables of Examples 1-20 of the present application after being cast and baked at 110°C for 24 hours is 2.81-2.95 g / cm 3 The compressive strength is 36.1-37.7MPa, and the volume density after burying carbon at 1450℃ for 3h is 2.75-2.85g / cm 3 , and the compressive strength is 65.7-74.6MPa. It is shown that the iron mouth channel castable provided in the present application has excellent compactness and compressive strength after casting and molding, and can effectively resist the erosion and wear of blast furnace gas and prevent gas leakage.

[0064] The test results of Examples 1-9 and Comparative Examples 1-4 show that the iron mouth channel castables prepared in Examples 1-9 are cast with a volume density of 2.84-2.95 g / cm after being baked at 110°C for 24 hours using four particle sizes of titanium oxide composite corundum with a particle size of 3-5 mm, titanium oxide composite corundum with a particle size of 1-3 mm, titanium oxide composite corundum with a particle size of 0.2-1 mm, and titanium oxide composite corundum with a particle size of ≤0.074 mm. 3 The compressive strength is 36.5-37.7MPa, and the volume density after burying carbon at 1450℃ for 3h is 2.75-2.85g / cm 3 , and the compressive strength is 67.3-74.6MPa; while the iron mouth channel castables prepared by compounding any three of the particle sizes of titanium oxide composite corundum with a particle size of 3-5mm, titanium oxide composite corundum with a particle size of 1-3mm, titanium oxide composite corundum with a particle size of 0.2-1mm and titanium oxide composite corundum with a particle size ≤0.074mm have a compressive strength of only 28.4-30.2MPa after baking at 110°C for 24h after casting, and a compressive strength of only 51.3-58.5MPa after being buried in carbon at 1450°C for 3h. It is explained that the present application adopts four particle sizes of titanium oxide composite corundum with a particle size of 3-5mm, titanium oxide composite corundum with a particle size of 1-3mm, titanium oxide composite corundum with a particle size of 0.2-1mm and titanium oxide composite corundum with a particle size of ≤0.074mm. The obtained iron mouth channel castable has high compressive strength and good density, which can effectively resist blast furnace gas scouring and prevent gas from flowing into the iron mouth channel, thereby inhibiting iron mouth splashing; further comparison shows that the compressive strength of the iron mouth channel castable obtained in Examples 1-7 after casting and baking at 110°C for 24h is only 37.1-37.7MPa ( ≥30MPa), and the compressive strength after being buried in carbon at 1450℃ for 3h is only 71.5-74.6MPa (≥70MPa), which means that the present application further controls the weight ratio of titanium oxide composite corundum with a particle size of 3-5mm, titanium oxide composite corundum with a particle size of 1-3mm, titanium oxide composite corundum with a particle size of 0.2-1mm and titanium oxide composite corundum with a particle size ≤0.074mm within the range of 1:(0.8-1.2):(0.5-0.9):(0.5-0.9), and the obtained iron mouth channel castable has higher compressive strength after casting and better effect of controlling iron mouth splashing.

[0065] The test results of Example 2, Example 10-13, and Comparative Examples 5-6 show that Comparative Examples 5-6 use Cyclic-Z or ρ-Al 2 O 3 As a binder, the obtained iron mouth channel castable has a volume density of 2.36-2.41 g / cm after being cast and baked at 110°C for 24 hours. 3The compressive strength is 25.8-27.4MPa, and the volume density after burying carbon at 1450℃ for 3h is 2.15-2.23g / cm 3 The compressive strength is 51.9-52.7MPa; and the volume density of the iron mouth channel castable obtained in Example 2 and Example 11-12 after being cast and baked at 110°C for 24h is 2.87-2.95g / cm 3 (≥2.85g / cm 3 ), the compressive strength is 37.0-37.7MPa (≥37.0MPa), and the bulk density after burying carbon at 1450℃ for 3h is 2.81-2.85g / cm 3 (≥2.80g / cm 3 ), the compressive strength is 70.4-74.6MPa (≥70.0MPa); and the volume density of the iron mouth channel castable obtained in Example 10 and Example 13 after baking at 110°C for 24h after casting is 2.81-2.84g / cm 3 The compressive strength is 36.2-36.6MPa, and the volume density after burying carbon at 1450℃ for 3h is 2.76-2.79g / cm 3 , the compressive strength is 67.9-69.1MPa. Therefore, it is explained that the present application further combines Sec-Z and ρ-Al 2 O 3 The weight ratio is controlled within the range of 1:(1.6-2.8), and the obtained iron mouth channel castable has higher density and compressive strength after casting, and the effect of controlling iron mouth splashing is better.

[0066] From the test results of Example 2 and Examples 14-20, it can be seen that the compressive strength of the iron mouth channel castables obtained in Example 2, Examples 15-16 and Example 19 after baking at 110°C for 24 hours after casting is 37.2-37.7MPa (≥37.0MPa), and the compressive strength after burying carbon and keeping warm at 1450°C for 3 hours is 70.9-74.6MPa (≥70.0MPa); and the compressive strength of the iron mouth channel castables obtained in Example 14, Examples 17-18 and Example 20 after baking at 110°C for 24 hours after casting is 36.1-36.9MPa, and the compressive strength after burying carbon and keeping warm at 1450°C for 3 hours is 65.7-68.8MPa. Therefore, it is explained that the present application further controls the weight proportions of titanium oxide composite corundum and composite binder within the following range: 55-65 parts of titanium oxide composite corundum and 10-13 parts of the composite binder. The obtained iron mouth channel castable has higher compressive strength after casting and better effect in controlling iron mouth splashing.

[0067] Application Example 1 Application Example 1 provides a technology for controlling iron mouth splashing.

[0068] The iron mouth channel castable used in the above method is prepared by enlarging the method of Example 2, and then water is added until the flow value is 130-140 mm, and stirred evenly to obtain; A technology for controlling iron mouth splashing, the construction method of which comprises the following steps: when a blast furnace is shut down for overhaul, the residual lining of the iron mouth channel is removed, the removal depth is to the entire iron mouth channel, and the circumferential direction is a portion with a diameter of 500mm to 600mm centered on the iron mouth; a circular arc baffle with the same diameter as the blast furnace is fixed at the iron mouth channel in the furnace (the gap with the blast furnace lining is minimized as much as possible), the side length of the baffle is ≥1000×1000mm, and the gap between the baffle and the blast furnace lining is filled with water cannon mud; a circular arc baffle is fixed at the iron mouth outside the blast furnace, and the upper part of the baffle is A pouring hole is set up with a size of 500×500mm. The radius of the baffle is the same as that of the blast furnace shell. The side length of the baffle is ≥1000×1000mm. The gap between the baffle and the shell is filled with water-filled cannon mud. Then, the iron mouth channel castable with a fluidity of 130-140mm is poured from the pouring hole, and the exhaust is vibrated with a vibrating rod, and the vibrating is vibrated while pouring to the upper edge of the baffle. After the iron mouth channel castable is solidified, the two baffles are removed. After natural curing for ≥3h, it is baked at 130℃ for 3h, 400℃ for 6h, and 780℃ for 6h. The amount of iron mouth channel castable used for a single treatment is about 3 tons.

[0069] Comparative application example 1 Comparative Application Example 1 provides an existing technology for controlling iron mouth splashing, and its construction steps are: first, determine the hole opening position according to the internal temperature monitoring results of the blast furnace and the furnace wall structure diagram; secondly, use a hole opening machine to open a hole on the furnace skin and install a valve; again, stir the iron mouth pressed material evenly; finally, use a pressing device and press the iron mouth pressed material into the place to be repaired through a conveying pipe; the amount of iron mouth pressed material used for a single treatment is about 3-5 tons.

[0070] Among them, the composition of the iron mouth pressure material is: 100kg of alumina particles with a particle size of 1-0.2mm, 100kg of alumina fine powder with a particle size of <0.088mm, 32kg of silicon carbide powder with a particle size of <0.088mm, 16kg of clay powder with a particle size of <0.088mm, 32kg of asphalt powder with a particle size of <0.088mm, and 220kg of liquid phenolic resin; batch preparation is carried out according to the above ratio.

[0071] Comparative Application Example 2 Comparative Application Example 2 provides an existing technology for controlling iron mouth splashing, and its construction steps are: first, put the anti-splashing gun mud into the mud gun machine, use the opening machine to drill the iron mouth channel, and after the molten iron and slag are out, press the anti-splashing gun mud into the iron mouth channel; the amount of anti-splashing gun mud used for a single treatment is about 8-10 tons.

[0072] Among them, the composition of the anti-splashing cannon mud is: 250kg of alumina with a particle size of 3-1mm, 150kg of alumina with a particle size of <0.088mm, 100kg of silicon carbide with a particle size of 1-0.2mm, 200kg of silicon carbide with a particle size of <0.088mm, 50kg of asphalt powder with a particle size of <0.088mm, 120kg of clay powder with a particle size of <0.088mm, 80kg of quartz powder with a particle size of <0.088mm, 80kg of kyanite powder with a particle size of <0.088mm, and 150kg of coal tar; it is prepared in batches according to the above ratio.

[0073] Anti-splash effect detection The methods or technologies provided in Application Example 1 and Comparative Application Examples 1-2 were used to treat the iron mouth passage, and the iron mouth splashing treatment effects were compared. The results are shown in Table 5 below.

[0074] Table 5 Iron mouth splashing control effect of application example 1 and comparative application example 1-2 Note: ★★★Excellent; ★★Good; ★Poor From the results in Table 5, it can be seen that the volume density and compressive strength of the iron mouth channel castable provided by the present application are much higher than those of the iron mouth press-in material and the anti-splashing taphole mud. This shows that the iron mouth channel castable provided by the present application has comprehensive advantages in terms of effect, safety, and durability in controlling iron mouth splashing, and is an innovative and effective new technology, new material, and new process for controlling blast furnace iron mouth splashing.

[0075] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A castable for a taphole channel for treating taphole splashing, characterized in that: The invention comprises the following components in parts by weight: 50-70 parts of titanium oxide composite corundum, 2-10 parts of silicon powder, 2-10 parts of titanium powder, 5-15 parts of ferrosilicon nitride powder, 3-5 parts of carbon black, 0.2-0.5 parts of azoamide, 3-5 parts of bentonite, 8-15 parts of composite binder and 0.1-0.5 parts of composite water reducing agent; The titanium oxide composite corundum includes titanium oxide composite corundum with a particle size of 3-5 mm, titanium oxide composite corundum with a particle size of 1-3 mm, titanium oxide composite corundum with a particle size of 0.2-1 mm, and titanium oxide composite corundum with a particle size of ≤0.074 mm; The composite binder is a mixture of Sec-Z and ρ-Al2O3.

2. The iron mouth channel castable according to claim 1, characterized in that: The weight ratio of the titanium oxide composite corundum with a particle size of 3-5 mm, the titanium oxide composite corundum with a particle size of 1-3 mm, the titanium oxide composite corundum with a particle size of 0.2-1 mm and the titanium oxide composite corundum with a particle size of ≤0.074 mm is 1: (0.8-1.2): (0.5-0.9): (0.5-0.9).

3. The iron mouth channel castable according to claim 1, characterized in that: The weight ratio of the titanium oxide composite corundum with a particle size of 3-5 mm, the titanium oxide composite corundum with a particle size of 1-3 mm, the titanium oxide composite corundum with a particle size of 0.2-1 mm and the titanium oxide composite corundum with a particle size of ≤0.074 mm is 1:1:0.7:0.

7.

4. The iron mouth channel castable according to claim 1, characterized in that: The weight ratio of the Sai Ke-Z and ρ-Al2O3 is 1:(1.1-3.4).

5. The iron mouth channel castable according to claim 4, characterized in that: The weight ratio of the Sai Ke-Z and ρ-Al2O3 is 1:(1.6-2.8).

6. The iron mouth channel castable according to claim 4, characterized in that: The weight portion of the titanium oxide composite corundum is 55-65 parts, and the weight portion of the composite binder is 10-13 parts.

7. The iron mouth channel castable according to any one of claims 1 to 6, characterized in that: The iron mouth channel castable comprises the following components in parts by weight: 60 parts of titanium oxide composite corundum, 6 parts of silicon powder, 6 parts of titanium powder, 10 parts of ferrosilicon nitride powder, 4 parts of carbon black, 0.4 parts of azoamide, 4 parts of bentonite, 13 parts of composite binder and 0.3 parts of composite water reducer.

8. A technology for controlling iron mouth splashing, characterized in that: The iron mouth channel castable according to any one of claims 1 to 7 is used.

9. The iron mouth splashing control technology according to claim 8 is characterized in that: The following steps are involved: When the blast furnace is shut down for overhaul, the residual lining of the iron mouth channel is removed, the removal depth is to the entire iron mouth channel, and the removal thickness is the part with a diameter of 500mm~600mm centered on the iron mouth in the circumferential direction; a circular arc baffle with the same inner diameter as the blast furnace is fixed at the iron mouth channel in the furnace, and the gap between the baffle and the lining of the blast furnace is filled with water cannon mud; a circular arc baffle is fixed at the iron mouth outside the blast furnace, a pouring hole is set on the upper part of the baffle, the pouring hole size is 500×500mm, the baffle arc radius is the same as the blast furnace shell, and the gap between the baffle and the shell is filled with water cannon mud; then pour the iron mouth channel castable with a fluidity of 130~140mm from the pouring hole, and vibrate the exhaust with a vibrating rod, and vibrate while pouring to the upper edge of the baffle; After the castable material of the iron mouth channel solidifies, remove the two baffles; Natural curing ≥ 3h, baking at 110~150℃ ≥ 2h, baking at 370~450℃ ≥ 5h, baking at 750~800℃ ≥ 5h.

10. The iron mouth splashing control technology according to claim 8, characterized in that: The following steps are involved: When repairing the wind or main iron trench of the blast furnace, remove the residual lining of the iron mouth channel, the removal depth is 500~600mm from the center line of the iron mouth outside the furnace to the furnace inside, and the circumferential direction is removed with a diameter of 500mm~600mm with the center of the iron mouth as the center of the circle; fix an arc-shaped baffle at the iron mouth outside the blast furnace, set a pouring hole on the upper part of the baffle, the pouring hole size is 500×500mm, the arc diameter of the baffle is the same as that of the blast furnace shell, the side length of the baffle is ≥1000×1000mm, and the gap between the baffle and the shell is filled with water cannon mud; then pour the iron mouth channel castable with a fluidity of 130~140mm from the pouring hole, and vibrate the exhaust with a vibrating rod, and vibrate while pouring to the upper edge of the baffle; After the iron mouth channel castable solidifies, the baffle shall be removed; natural curing shall be ≥30min, baking at 110~150℃ for ≥1h, baking at 370~450℃ for ≥2h, baking at 750~800℃ for ≥1h.

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