Expanding iron mouth type anhydrous stemming for blast furnace of more than 2000 cubic meters
By introducing high-temperature pitch particles, silicon nitride, and other components, along with polyethylene glycol 200, into the blast furnace taphole clay, the problem of insufficient strength and depth of the taphole clay in blast furnaces with a volume of 2000 cubic meters or more was solved. This achieved high-temperature stability and good opening performance, improved compressive and flexural strength, and ensured blast furnace safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-08
- Publication Date
- 2026-04-03
AI Technical Summary
Existing technologies are insufficient to provide suitable taphole strength and taphole depth in blast furnaces with a volume of 2,000 cubic meters or more, resulting in unstable tapping order and safety hazards. Furthermore, the existing raw material ratio adjustment has reached a technical bottleneck and cannot further improve performance.
The process uses high-temperature asphalt particles, silicon nitride, clay, carbon black, pyrophyllite, bauxite clinker, silicon carbide, coke powder, and polyethylene glycol 200 as components. Through specific proportions and processing, anhydrous gunning mud is formed. The low boiling point of polyethylene glycol 200 is utilized to combine with high-temperature asphalt powder to form carbon coke, thereby improving strength and stability.
It enables rapid stabilization of the mud bag at high temperatures, provides good opening performance and taphole depth, improves compressive strength and flexural strength, reduces porosity, and ensures safe operation of the blast furnace.
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Figure BDA0005726439980000051
Abstract
Description
Technical Field
[0001] This invention relates to the field of refractory materials for taphole clay, and more specifically, to an anhydrous taphole clay for blast furnaces with a capacity of 2000 cubic meters or more. Background Technology
[0002] With the increasing size of blast furnaces, taphole clay, a plastic material used to seal the taphole, is used by pressing it into the iron channel with a clay gun to seal the taphole and prevent molten iron and slag from flowing out. This protects the furnace walls and bottom in the taphole area. The quality of the taphole clay directly affects the safe operation of the blast furnace.
[0003] To ensure stable taphole operation and meet the needs of intensified blast furnace smelting, the taphole clay must possess a certain taphole depth, good workability, and sinterability, while also exhibiting strong resistance to slag, molten iron erosion, and oxidation. During the taphole opening process, excessively high taphole strength can disrupt the tapping sequence, potentially leading to insufficient tapping and preventing molten iron from draining from the furnace, while also increasing material consumption. Conversely, insufficient taphole strength can result in significant pressure differences between the furnace interior and exterior, potentially causing molten iron to splash, compromising taphole safety.
[0004] Currently, many taphole clay manufacturers choose phenolic resin to improve taphole strength and stabilize taphole depth. However, thermosetting phenolic resin has limitations at 2000m... 3 When used in blast furnaces, excessively high temperatures can cause the clay to solidify in the clay gun, preventing the clay from being injected and affecting tapping safety. Thermoplastic phenolic resin, when used, has insufficient curing temperature and does not easily develop strength in a short time. Currently, the low-temperature strength of the clay mainly comes from raw materials such as tar, pitch, and a small amount of resin. Adjusting the proportion of these raw materials has reached the technical limit, and further improvements in refractory properties are impossible, failing to meet the requirements of on-site use. Summary of the Invention
[0005] To solve the above-mentioned technical problems, the present invention provides an anhydrous taphole clay for blast furnaces with a capacity of 2000 cubic meters or more.
[0006] An anhydrous taphole clay for blast furnaces with a capacity of 2000 cubic meters or more comprises the following components by mass percentage: 3-4% high-temperature pitch particles, 13-20% silicon nitride ferronitride, 10-13% clay, 0.5-2% carbon black, 3-5% pyrophyllite, 31-39% bauxite clinker, 13-18% silicon carbide, 5-7% coke powder, 1-3% polyethylene glycol, and 12-13% tar; wherein the polyethylene glycol is polyethylene glycol 200 with a molecular weight of 190-210, which achieves curing strength at 250-350℃ and completes temperature relay with β resin in the high-temperature pitch powder to form carbon coke.
[0007] Preferably, the high-temperature asphalt particles have a particle size of 1-0 mm, a softening point of 110-130℃, a fixed carbon content of ≥60%, a quinoline insoluble content of 5-15%, and an ash content of <0.3%.
[0008] Preferably, the silicon nitride has a particle size of 200 mesh.
[0009] Preferably, the pyrophyllite has a particle size of 3-1 mm.
[0010] Preferably, the bauxite clinker comprises 15-18% bauxite clinker with a particle size of 3-1mm, 12-15% bauxite clinker with a particle size of 1-0mm, and 4-6% bauxite clinker with a particle size of 200 mesh.
[0011] Preferably, the silicon carbide is silicon carbide 90, comprising 8-10% silicon carbide 90 with a particle size of 1-0 mm and 5-8% silicon carbide 90 with a particle size of 200 mesh.
[0012] Preferably, the particle size of the coke powder is 3-0 mm.
[0013] Preferably, the density of the tar is >1.10 g / cm³. 3 (20℃), rotational viscosity at 60-70℃ is 0.05-0.3 Pa·s, fixed carbon content is ≥25%, and moisture content is <0.1%.
[0014] A method for preparing anhydrous taphole clay for blast furnaces with a capacity of 2000 cubic meters or more includes the following steps:
[0015] Step 1: Use high-temperature asphalt particles, silicon nitride iron, clay, and carbon black as component A, and premix them for 20-25 minutes using a V-type premixer;
[0016] Step 2: Prepare pyrophyllite, bauxite clinker, silicon carbide, and coke powder as material B;
[0017] Step 3: Mix materials A and B in a mixer for 5-6 minutes.
[0018] Step 4: Add polyethylene glycol and mix using a wheel for 5-6 minutes;
[0019] Step 5: Add tar and mix with a wheel for 25-30 minutes. Control the discharge temperature at 65±3℃ and the Mascher value at 60℃ is 1.1-1.3kMPa.
[0020] Step Six: Conditioning treatment. If the air temperature is >15℃, place at room temperature for 7 days before use. If the air temperature is <15℃, place for 10 days before use.
[0021] Preferably, the amount of polyethylene glycol added is 2%, and the amount of tar added is adjusted accordingly to 11%.
[0022] The beneficial effects of this invention are as follows:
[0023] 1. This invention uses polyethylene glycol 200 as a binder, taking advantage of its low boiling point, absence of low-melting substances, and easy miscibility with other substances, to effectively increase the strength formed during the pressing process, giving the gun clay good opening performance and taphole depth.
[0024] 2. Effectively overcomes existing technological bottlenecks. Existing technologies rely on adjusting the amounts of tar, pitch, and resin added to increase strength. However, when the raw material ratio is difficult to control, this method is insufficient at a strength of 2000m³. 3 The above-mentioned blast furnaces have reached a technical bottleneck period due to their difficulty in operation. This invention effectively solves this problem.
[0025] 3. Effectively solves the strength problem of taphole clay at 250-350℃, achieving rapid stabilization of the clay bag during tapping. This component is stable at high temperatures, contains no low-melting-point substances, and has no shrinkage, providing strength at low temperatures without affecting high-temperature tapping.
[0026] 4. Experimental data show that when the amount of polyethylene glycol 200 added is 2%, the compressive strength at 400℃ reaches 14.72 MPa, which is 20.6% higher than the 12.21 MPa of the unadded solution; the flexural strength increases by 28.6%; the porosity decreases to 13.08%; and the bulk density increases to 2.27 kg / cm³. 3 .
[0027] 5. Significant practical application results: at 2650m 3 When used on a blast furnace, the taphole strength was suitable, and it could be opened with two drill bits. There was no red-hot taphole, no iron leakage or seepage, and the taphole depth increased by 0.2m after two days of use; at 4000m... 3 When used on a blast furnace, one drill bit can open the taphole, and the taphole depth increases by 0.4m after one day of use, effectively solving the problem of abnormal taphole depth. Detailed Implementation
[0028] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, some features described in the examples may be combined in other examples.
[0029] Example 1
[0030] This embodiment proposes an anhydrous taphole clay for blast furnaces with a capacity of 2000 cubic meters or more, comprising the following components by mass percentage:
[0031] The composition of the high-temperature asphalt particles is as follows: 3.5%, silicon nitride iron 17%, clay 12%, carbon black 1%, pyrophyllite 4%, bauxite clinker 35%, silicon carbide 15%, coke powder 6%, polyethylene glycol 2%, and tar 12.5%.
[0032] The polyethylene glycol is polyethylene glycol 200, with a molecular weight of 200. It achieves curing strength at 300℃ and completes a temperature relay with the β resin in the high-temperature asphalt powder to form carbon coke.
[0033] The high-temperature asphalt particles have a particle size of 1-0.5 mm, a softening point of 120℃, a fixed carbon content of ≥60%, a quinoline insoluble content of 10%, and an ash content of <0.3%.
[0034] The particle size of silicon nitride iron is 200 mesh.
[0035] The pyrophyllite grain size is 2mm.
[0036] The bauxite clinker comprises 16% bauxite clinker with a particle size of 2mm, 14% bauxite clinker with a particle size of 1-0mm, and 5% bauxite clinker with a particle size of 200 mesh.
[0037] The silicon carbide is silicon carbide 90, which includes 9% silicon carbide 90 with a particle size of 1-0 mm and 6% silicon carbide 90 with a particle size of 200 mesh.
[0038] The particle size of the coke powder is 2mm.
[0039] Tar density > 1.10 g / cm³ 3 (20℃), rotational viscosity at 65℃ is 0.15 Pa·s, fixed carbon content ≥25%, moisture content <0.1%.
[0040] Example 2
[0041] The difference between this embodiment and Embodiment 1 is that:
[0042] Anhydrous tapping clay, comprising the following components by mass percentage:
[0043] The composition of the product is as follows: 3% high-temperature asphalt particles, 13% silicon nitride iron, 10% clay, 0.5% carbon black, 5% pyrophyllite, 39% bauxite clinker, 18% silicon carbide, 7% coke powder, 3% polyethylene glycol, and 13% tar.
[0044] The polyethylene glycol is polyethylene glycol 200 with a molecular weight of 190. It reaches its curing strength at 250°C and forms carbon coke by completing a temperature relay with the β resin in the high-temperature asphalt powder.
[0045] The high-temperature asphalt particles have a particle size of 1-0 mm, a softening point of 110℃, a fixed carbon content of ≥60%, a quinoline insoluble content of 5%, and an ash content of <0.3%.
[0046] The pyrophyllite grain size is 3mm.
[0047] The bauxite clinker comprises 15% bauxite clinker with a particle size of 3mm, 12% bauxite clinker with a particle size of 1-0mm, and 4% bauxite clinker with a particle size of 200 mesh.
[0048] The silicon carbide is silicon carbide 90, which includes 8% silicon carbide 90 with a particle size of 1-0 mm and 5% silicon carbide 90 with a particle size of 200 mesh.
[0049] The particle size of the coke powder is 3mm.
[0050] Tar density > 1.10 g / cm³ 3 (20℃), rotational viscosity at 60℃ is 0.05 Pa·s, fixed carbon content ≥25%, moisture content <0.1%.
[0051] Example 3
[0052] The difference between this embodiment and Embodiment 1 is that:
[0053] Anhydrous tapping clay, comprising the following components by mass percentage:
[0054] High-temperature asphalt particles 4%, silicon nitride ferronitride 20%, clay 13%, carbon black 2%, pyrophyllite 3%, bauxite clinker 31%, silicon carbide 13%, coke powder 5%, polyethylene glycol 1%, tar 12%;
[0055] The polyethylene glycol is polyethylene glycol 200 with a molecular weight of 210. It reaches its curing strength at 350°C and forms carbon coke by completing a temperature relay with the β resin in the high-temperature asphalt powder.
[0056] The high-temperature asphalt particles have a particle size of 1-0 mm, a softening point of 130℃, a fixed carbon content of ≥60%, a quinoline insoluble content of 15%, and an ash content of <0.3%.
[0057] The pyrophyllite grain size is 1 mm.
[0058] The bauxite clinker comprises 18% bauxite clinker with a particle size of 1mm, 15% bauxite clinker with a particle size of 1-0mm, and 6% bauxite clinker with a particle size of 200 mesh.
[0059] The silicon carbide is silicon carbide 90, which includes 10% silicon carbide 90 with a particle size of 1-0 mm and 8% silicon carbide 90 with a particle size of 200 mesh.
[0060] Tar density > 1.10 g / cm³ 3 (20℃), rotational viscosity at 60-70℃ is 0.05-0.3 Pa·s, fixed carbon content is ≥25%, and moisture content is <0.1%.
[0061] Example 4
[0062] This embodiment proposes a method for preparing anhydrous taphole clay for blast furnaces with a capacity of 2000 cubic meters or more, comprising the following steps:
[0063] Step 1: Use high-temperature asphalt particles, silicon nitride iron, clay, and carbon black as component A, and premix them for 20-25 minutes using a V-type premixer;
[0064] Step 2: Prepare pyrophyllite, bauxite clinker, silicon carbide, and coke powder as material B;
[0065] Step 3: Mix materials A and B in a mixer for 5-6 minutes.
[0066] Step 4: Add polyethylene glycol and mix using a wheel for 5-6 minutes;
[0067] Step 5: Add tar and mix with a wheel for 25-30 minutes. Control the discharge temperature at 65±3℃ and the Mascher value at 60℃ is 1.1-1.3kMPa.
[0068] Step Six: Conditioning treatment. If the air temperature is >15℃, place at room temperature for 7 days before use. If the air temperature is <15℃, place for 10 days before use.
[0069] The amount of polyethylene glycol added is 2%, and the amount of tar added is adjusted accordingly to 11%.
[0070] Example 5
[0071] By adding polyethylene glycol and comparing the basic properties of the potting clay, it was found that the compressive strength at 200-400 degrees Celsius showed a linear relationship and increased significantly.
[0072] Table 1: List of polyethylene glycol raw materials with different proportions
[0073] Raw material name Option 0# Option 1# Option 2# Option 3# bauxite aggregate 30％ 30％ 30％ 30％ fine alum powder 5％ 5％ 5％ 5％ Pyrophyllite aggregate 5％ 5％ 5％ 5％ Silicon carbide 90 15％ 15％ 15％ 15％ Caramel powder 5％ 5％ 5％ 5％ Iron silicon nitride 20％ 20％ 20％ 20％ clay 10％ 10％ 10％ 10％ carbon black 1％ 1％ 1％ 1％ High-temperature asphalt particles 3％ 3％ 3％ 3％ Polyethylene glycol 200 0％ 1％ 2％ 3％ tar 15％ 12％ 11％ 9％
[0074] The relationship between the amount of polyethylene glycol 200 added (x) and the amount of tar added (y) is y = k / x, where as x increases, y decreases significantly, and the two are negatively correlated.
[0075] Table 2: Physical properties at different temperatures
[0076]
[0077] The temperature range of 200-400℃ is the reaction temperature range between polyethylene glycol and asphalt and tar. The changes in strength within this range provide strong evidence of the significant impact of polyethylene glycol addition on the performance of drilling mud.
[0078] As temperature changes, the flexural strength gradually increases with the amount of polyethylene glycol (PEG) added, reaching a peak at 400℃ when the PEG content is 2%. When the PEG content is too high, the flexural strength decreases; this is because excessive PEG content results in a greater number of uniform pores than is required for asphalt coking, thus affecting the flexural strength.
[0079] The compressive strength gradually increases with temperature and the amount of polyethylene glycol added, reaching a peak at 400℃ when the addition amount is 2%. When the amount of polyethylene glycol added is too high, the compressive strength decreases.
[0080] The bulk density gradually increases with temperature and the amount of polyethylene glycol added, reaching peak values at 300℃ and 400℃ when the addition amount is 2%. The bulk density decreases when the amount of polyethylene glycol added is too high.
[0081] As temperature changes, the porosity gradually increases with the amount of polyethylene glycol added, reaching its lowest point at 400℃ when the addition amount is 2%. When the amount of polyethylene glycol added is too high, the porosity increases further.
[0082] In the experiments, the best experimental data were obtained when 2% of polyethylene glycol 200 was added. In actual use, it is recommended to add 1-3% depending on the usage conditions.
[0083] At 2650m 3 When used on a blast furnace, the taphole strength is suitable, and it can be opened with two drill bits. There is no red-hot taphole, no iron leakage or seepage, and the taphole depth increases by 0.2m after 2 days of use.
[0084] At 4000m 3 When used on a blast furnace, the taphole depth was abnormal. After using the invented taphole clay, the taphole strength was suitable, and it could be opened with one drill bit. There was no red-hot taphole, no iron leakage or seepage, and the taphole depth increased by 0.4m after one day of use.
[0085] The embodiments of the present invention have been described above. However, the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make more equivalent embodiments under the guidance of the present embodiments, and all of them are within the protection scope of the present embodiments.
Claims
1. A type of anhydrous taphole clay for blast furnaces with a capacity of 2000 cubic meters or more, characterized in that, The composition by mass percentage includes: 3-4% high-temperature asphalt particles, 13-20% silicon nitride iron, 10-13% clay, 0.5-2% carbon black, 3-5% pyrophyllite, 31-39% bauxite clinker, 13-18% silicon carbide, 5-7% coke powder, 1-3% polyethylene glycol, and 12-13% tar; wherein the polyethylene glycol is polyethylene glycol 200 with a molecular weight of 190-210, which achieves curing strength at 250-350℃ and completes temperature relay with β resin in the high-temperature asphalt powder to form carbon coke.
2. The anhydrous tapping mud according to claim 1, characterized in that, The softening point of the high-temperature asphalt particles is 110-130℃, the fixed carbon content is ≥60%, the quinoline insoluble content is 5-15%, and the ash content is <0.3%.
3. The anhydrous tapping mud according to claim 1, characterized in that, The silicon nitride has a particle size of 200 mesh.
4. The anhydrous tapping mud according to claim 1, characterized in that, The pyrophyllite has a particle size of 3-1 mm.
5. The anhydrous tapping mud according to claim 1, characterized in that, The bauxite clinker comprises 15-18% bauxite clinker with a particle size of 3-1mm, 12-15% bauxite clinker, and 4-6% bauxite clinker with a particle size of 200 mesh.
6. The anhydrous tapping mud according to claim 1, characterized in that, The silicon carbide is silicon carbide 90, comprising 8-10% silicon carbide 90 and 5-8% silicon carbide 90 with a particle size of 200 mesh.
7. The anhydrous tapping mud according to claim 1, characterized in that, The particle size of the coke powder is 3-0 mm.
8. The anhydrous tapping mud according to claim 1, characterized in that, The density of the tar is >1.10 g / cm³. 3 The rotational viscosity is 0.05-0.3 Pa·s at 60-70℃, the fixed carbon content is ≥25%, and the moisture content is <0.1%.
9. The method for preparing anhydrous pipe clay according to any one of claims 1 to 8, characterized in that, Includes the following steps: Step 1: Use high-temperature asphalt particles, silicon nitride iron, clay, and carbon black as component A, and premix them for 20-25 minutes using a V-type premixer; Step 2: Prepare pyrophyllite, bauxite clinker, silicon carbide, and coke powder as material B; Step 3: Mix materials A and B in a mixer for 5-6 minutes. Step 4: Add polyethylene glycol and mix using a wheel for 5-6 minutes; Step 5: Add tar and mix with a wheel for 25-30 minutes. Control the discharge temperature at 65±3℃ and the Mascher value at 60℃ is 1.1-1.3kMPa. Step Six: Conditioning treatment. If the air temperature is >15℃, place at room temperature for 7 days before use. If the air temperature is <15℃, place for 10 days before use.
10. The preparation method according to claim 9, characterized in that, The amount of polyethylene glycol added is 2%, and the amount of tar added is adjusted accordingly to 11%.