CN113754450A - Preparation method of high-stability stemming for iron notch of COREX furnace - Google Patents
Preparation method of high-stability stemming for iron notch of COREX furnace Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title description 58
- 229910052742 iron Inorganic materials 0.000 title description 29
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 239000007767 bonding agent Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 7
- 239000002985 plastic film Substances 0.000 claims abstract description 7
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- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 6
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 6
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 6
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 5
- 238000005204 segregation Methods 0.000 claims abstract description 4
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- 238000004519 manufacturing process Methods 0.000 claims description 8
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- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
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- 238000007906 compression Methods 0.000 claims description 3
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- 238000001764 infiltration Methods 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 abstract 2
- 238000010079 rubber tapping Methods 0.000 description 26
- 238000003723 Smelting Methods 0.000 description 18
- 239000002893 slag Substances 0.000 description 11
- 239000011819 refractory material Substances 0.000 description 9
- 229910052593 corundum Inorganic materials 0.000 description 8
- 239000010431 corundum Substances 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 6
- 229910010271 silicon carbide Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 5
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- 238000006243 chemical reaction Methods 0.000 description 4
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- 239000002245 particle Substances 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
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- 229910045601 alloy Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000010443 kyanite Substances 0.000 description 2
- 229910052850 kyanite Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
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- 230000035939 shock Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
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- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
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- 239000004014 plasticizer Substances 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000011271 tar pitch Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- -1 urotropine Chemical compound 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The invention discloses a preparation method of high-stability stemming for a COREX furnace taphole, which comprises the steps of weighing, proportioning and mixing raw materials, mixing the raw materials according to the proportion of the stemming which is normally produced, uniformly mixing and stirring the raw materials in a forced stirrer for 3-5min, ensuring full mixability and eliminating operation segregation between aggregate and fine powder; stirring the mixed materials for enough time, adding a bonding agent, controlling the temperature of the bonding agent at 25-30 ℃, and selecting the bonding agent compounded by tar and resin as the bonding agent; rolling and stirring the combined stemming by using an edge runner mill for 20-25 minutes, wherein the temperature of the stemming needs to be controlled to be about 25-30 ℃; the stemming is extruded and molded, the stemming after rolling and stirring is poured into a stemming extruder for extrusion, the stemming packaged by a plastic film must be subjected to a proper stemming standing process for 24-48 hours to stabilize good infiltration performance between a bonding agent and raw materials, and the stemming produced by the steps comprises the following components in percentage by mass: al (Al)2O325‑29%、SiO217‑21%、SiC 21‑26%、Si3N43‑7%、F.C 5‑7%。
Description
Technical Field
The invention relates to a preparation method of high-stability stemming for a COREX furnace taphole.
Background
The stemming is a plastic refractory material for blocking the tap hole, and the tap hole needs to be repeatedly opened and blocked every day during the production of the blast furnace. During tapping, the hot molten iron and the molten slag flow through a tapping hole to generate physical and chemical reactions and scouring effects on the stemming; when tapping is finished, a mud gun is used for pressing new stemming into a tapping hole channel to seal a tapping hole and prevent molten iron and molten slagAnd the outflow has the function of protecting the furnace wall and the furnace bottom of the taphole area. In the front tapping operation of the blast furnace, the stemming functions like a valve, and the stemming is required to maintain the diameter of a tapping hole pore passage to be stable and the tapping speed to be uniform. With the transformation of iron-making technology, non-blast furnace smelting technology gradually shows technical advantages, and compared with the modeling of a blast furnace and the increase of smelting strength, a non-blast furnace smelting system realizes the high-efficiency smelting of total oxygen, the quality requirement on stemming is higher and higher, and from the perspective of environmental protection, the stemming does not smoke when blocking an iron notch, no harmful gas is contained in the gas around the iron notch, and the stemming needs to adapt to the technical characteristics of the high-efficiency smelting of the total oxygen of the non-blast furnace from the perspective of process safety. The stemming is Al composed of aggregate, powder, binder and liquid203-SiO2The basic requirement of the SiC-C material on the performance of the stemming is good plasticity, and the extruded mud is a compact mud column without fracture or looseness; the lubricating agent has good lubricity, can be stably extruded into the tap hole, and cannot be obstructed; sintering to a certain degree at the tapping hole to form a mud pack to protect the lining body at the inner side of the tapping hole.
The stemming used in the early stage has simple production process, is generally extruded into cylindrical mud blocks by a mud extruder before use, and is extruded into a taphole after being put into a mud gun when in use. The ratio fluctuation of various raw materials for the stemming is large, and most of the stemming is made of coke powder and clay: the traditional stemming is prepared by taking alumina clinker and tar pitch as main raw materials and adding water and stirring. The stemming is generally small in volume density and poor in slag iron corrosion resistance, and when the stemming is used on a large and medium blast furnace, the depth of an iron notch is insufficient, so that the normal production of the blast furnace is influenced, and the high-efficiency smelting safety requirement of a non-blast furnace smelting reduction iron-making process cannot be met. With the large-scale and long-life of non-blast furnace process total oxygen smelting, the stemming is changed from a pure consumable refractory material to a functional refractory material, not only blocks an iron notch, but also can protect a furnace lining of a hearth area, thereby prolonging the service life of a smelting reduction gasification furnace and reducing environmental pollution.
The modern iron-making blast furnace has the following requirements on stemming: (1) easy opening, and finally discharging the slag iron when tapping is needed. Therefore, the stemming must have good operation performance, the stemming in the taphole can be easily drilled through so as to facilitate timely tapping and smooth tapping operation in front of the furnace. The labor intensity of the operation workers in front of the furnace is reduced; (2) easy blocking, namely, after the high tapping process is finished, the tapping hole is blocked in a short time, so that enough mud beating amount is ensured, and the stable tapping depth is kept; (3) good plasticity, when the stemming blocks any taphole, the stemming is uniformly filled in a taphole pore channel and is molded in the pore channel; (4) good adhesiveness, the new stemming is pressed into the taphole and has good adhesiveness with the old stemming in the hole, the new stemming and the old stemming are ensured to form a whole, the phenomena of iron infiltration and slag infiltration caused by poor adhesion and the influence on the secondary taphole opening are prevented, and (5) good sinterability is required that the stemming pressed into the taphole can achieve sintering of different degrees in three temperature stages of low temperature, medium temperature and high temperature, the taphole is sealed in time, and simultaneously a mud bag with enough size is formed in the furnace cylinder, thereby playing the role of protecting the lining brick in the cylinder. Therefore, in order to create economic and environmental benefits for steel enterprises, it is necessary and urgent to select a proper treatment process and a utilization approach to develop a novel stemming. And (3) document retrieval: the COREX furnace is a unique iron ore direct melting reduction iron technology in China of our company. Searching the literature, such a technique is not found.
Disclosure of Invention
The invention aims to provide a preparation method of high-stability stemming for a COREX furnace taphole, which can produce reliable high-stability stemming by combining the high-temperature, high-pressure and splashing tapping conditions of molten iron of the COREX furnace.
The technical scheme adopted by the invention is as follows: a preparation method of high-stability stemming for a COREX furnace taphole comprises the following preparation steps: step 1: the granularity inspection of the raw materials determines that the granularity of the powder and the aggregate is proper, and the powder can be used as a good adhesion base material of the bonding agent; step 2: weighing, proportioning and mixing the raw materials, controlling the batch weight, mixing and weighing the raw materials, mixing the raw materials according to the proportion of the normal production stemming, uniformly mixing and stirring the raw materials in a forced stirrer for 3 to 5min, ensuring the sufficient mixing property and eliminating the operation segregation between aggregate and fine powder; and step 3: stirring the mixed materials for enough time, adding a bonding agent for bonding various raw materialsThe temperature of the agent is controlled at 25-30 ℃, and the binding agent is a tar and resin composite binding agent; and 4, step 4: stirring and grinding the mud, namely, grinding and stirring the combined stemming by using an edge runner mill for 20-25 minutes, wherein the temperature of the mud needs to be controlled to be about 25-30 ℃; and 5: extruding and molding the stemming, pouring the stemming which is well rolled and stirred into a stemming extruder for extruding, and extruding the stemming uniformly and stably in a strip shape; step 6: the stemming packaging and cutting are carried out, the stemming is packaged by adopting a plastic film to coat during extrusion, and the extruded and packaged stemming is cut and partitioned by adopting cutting equipment along with the extrusion length so as to be beneficial to later use; and 7: the stemming packaged by the plastic film needs to be subjected to a proper stemming standing process for 24-48 hours to stabilize good invasion between the binding agent and the raw materials, and the stemming can be placed into a nylon bag to be packaged in the process; the stemming produced by the steps comprises the following components in percentage by mass: al (Al)2O3 25-29%、SiO2 17-21%、SiC 21-26%、Si3N43 to 7 percent and 5 to 7 percent of F.C, under the condition of 1200 ℃ for 3 hours, the stemming has the volume specific gravity of 2.26, the apparent porosity of 22.4 percent, the bending strength of 11.9 MPa and the compression strength of 23.1 MPa.
The novel stemming is resin-tar combined stemming, tar is used as a plasticizer, and phenolic resin, asphalt and inorganic phosphate are used as binding agents. The novel stemming has the advantages of early hardness of resin stemming and extension iron notch performance of tar stemming, reduces the consumption of resin and reduces the cost of stemming. The resin is liquid phenolic resin and hardener such as urotropine, or liquid resol, or mixture thereof as binder. The average molecular mass of the resin has a significant influence on the hardening speed of the stemming, and the higher the average molecular mass is, the faster the hardening speed is, thereby affecting the extrusion work. The phenolic resin is suitable for stemming, is usually a light brown transparent liquid, has the viscosity of 30 PaS-50PaS (at 5-25 ℃), the volume density of (at 25 ℃)1.21g/cm3, less than 5% of free phenol, less than 0.9% of free formaldehyde, less than 1.0% of water and 40% -45% of fixed carbon. The stemming comprises the following components: (1) the coke powder has high temperature resistance, slag resistance, good air permeability, difficult bonding with slag iron, high porosity and heat conductivityAnd the alloy has good electrical conductivity, high load deformation temperature, stable slag resistance and thermal shock resistance, ensures that the taphole keeps a reducing atmosphere, and plays a role in protecting silicon carbide, a carbonization grid and a carbon material. (2) Silicon carbide: the silicon carbide is an artificially synthesized industrial product, and is prepared by placing high-purity quartz sand and petroleum into a resistance furnace, and performing chemical reaction at 1600-2500 deg.C, wherein the density is 3.17-3.37g/cm3The high-thermal-conductivity, high-wear-resistance and high-temperature strength alloy has the advantages of high thermal conductivity, high wear resistance, low thermal expansion coefficient and good thermal shock stability, and can improve the slag erosion resistance and the scouring resistance of the raw material of the taphole stemming. (3) Corundum, the density of corundum is 3.95-4.18g/cm3The softening temperature is higher (>1870 deg.C) above 2050 deg.C, stable chemical properties, high abrasion resistance, and good resistance to erosion of iron slag, and is a high-quality refractory material. According to different raw materials and processing modes, the raw materials are divided into electric smelting brown corundum, electric smelting white corundum and sintering corundum, and the electric smelting white corundum is used as powder in stemming. (4) Silicon nitride (Si)3N4) Is an artificially synthesized industrial product and has no natural minerals. Si3N4Reaction with CO to form Si0 to precipitate C and Si on the surface3N and 02Reaction to Si02A protective film for preventing oxidation, and proper amount of Si is added into the stemming3N4Can improve the erosion resistance and the wear resistance of the stemming. (5) High-alumina aggregate, which plays a role of a skeleton in stemming for plugging a taphole, belongs to a compact refractory particle raw material, has a particle size of about 3mm, and has a refractoriness of 1770 ℃. On the premise of ensuring certain plasticity, the smaller the particle size is, the better the particle size is. (6) The clay is a mixture composed of various water-containing aluminosilicate minerals, has the granularity of 1-2 μm, has good plasticity in a wet state, is an indispensable material in stemming ingredients, and has the refractoriness requirement higher than 1580 ℃. (7) The novel taphole stemming is added with mica for improving the construction performance of the indeterminate refractory material and the performance of the stemming. The refractory material bonding agent is used for strengthening the bonding structure of the refractory material, so that the powdery or granular refractory material is sintered and has enough strength.
The important reason for optimizing the quality of the blast furnace stemming is that SiC is used,Si3N4、Kyanite, sericite, brown corundum, etc. Adding the kyanite utilizes the high-temperature shadow expansibility control line change rate, can increase the sintering strength of the stemming and improve the durability of the stemming; the sericite is added, so that the firing temperature is reduced by utilizing the potassium and sodium oxide contained in the sericite, the stemming is quick-dried and quick-hardened, and the plasticity of the stemming can be improved; the brown corundum is added to the steel plate to make use of the chemical resistance of the steel plate.
The smelting reduction iron-making technology adopts total oxygen smelting, and is characterized by high furnace temperature, large fluctuation of furnace pressure and furnace condition, and no comparability of smelting conditions with the traditional blast furnace. The tapping time of the eight-steel Euler furnace is prolonged to more than 150min, the highest molten iron temperature can reach 1550 ℃, the highest molten iron flow rate can reach more than 12m/min, the fluctuation is large, the erosion and scouring to the taphole are severe, and higher requirements on the quality of the taphole and the mass of sludge are provided.
100 million tons of non-blast furnace total oxygen melting smelting furnaces which are successfully produced in China annually only have 1 Xinjiang eight-steel European smelting furnace, 2 tap holes are arranged, and the average tapping frequency per day is 6-8. The maximum sunrise iron amount reaches 4200t, the slag amount reaches 1680t, and the primary tapping speed is 5.5-12.5 t.min-Due to the characteristics of total oxygen smelting, the maximum iron yield reaches 20 t.min-The furnace is in a conventional state, the front and back fluctuation of the tapping temperature reaches 100 ℃, the tapping temperature can be changed from 1480-1580 ℃ in the same furnace, and the tapping time is more than 150 min. The quality of the stemming performance relates to the production and operation of a blast furnace, and if the stemming quality is not good, various problems can be caused, such as iron notch breakage, iron notch wetting, shallow iron notch and the like, and even accidents harmful to personal safety are caused. The method develops the high-quality stemming with stable iron notch aperture, uniform iron tapping and long depth of the iron notch, can improve the yield of the reduction furnace and reduce the consumption of refractory materials. The invention relates to a special stemming developed for an Ou-metallurgical furnace of a reduction iron-making furnace. The main indices are shown in the following table.
The quality and performance indexes of the novel stemming are shown in the following table:
the novel taphole stemming is suitable for the same type of ironmaking enterprises, has moderate plasticity, can facilitate the operation in front of a furnace, has proper porosity, is convenient for discharging water and gas, has better volume stability and high refractoriness, resists the rush and erosion of molten iron and smoke slag, can avoid the generation of cracks and the leakage of the molten iron, has very important function on the maintenance of a taphole, and plays an important role in determining the service life of a blast furnace. The novel stemming is easy to drill, corrosion-resistant, long in tapping time (which can reach more than 1 hour), stable in tapping, small in environmental pollution, capable of meeting the production requirements of similar enterprises, obvious in economic benefit and environmental benefit, high in practical value and popularization significance.
Detailed Description
A preparation method of high-stability stemming for a COREX furnace taphole comprises the following steps:
step 1: the granularity inspection of the raw materials determines that the granularity of the powder and the aggregate is proper, and the powder can be used as a good adhesion base material of the bonding agent;
step 2: weighing, proportioning and mixing the raw materials, controlling the batch weight, mixing and weighing the raw materials, mixing the raw materials according to the proportion of the normal production stemming, uniformly mixing and stirring the raw materials in a forced stirrer for 3 to 5min, ensuring the sufficient mixing property and eliminating the operation segregation between aggregate and fine powder;
and step 3: stirring the mixed materials for enough time, adding a bonding agent for bonding various raw materials, controlling the temperature of the bonding agent at 25-30 ℃, and selecting the bonding agent compounded by tar and resin as the bonding agent;
and 4, step 4: stirring and grinding the mud, namely, grinding and stirring the combined stemming by using an edge runner mill for 20-25 minutes, wherein the temperature of the mud needs to be controlled to be about 25-30 ℃;
and 5: extruding and molding the stemming, pouring the stemming which is well rolled and stirred into a stemming extruder for extruding, and extruding the stemming uniformly and stably in a strip shape;
step 6: the stemming packaging and cutting are carried out, the stemming is packaged by adopting a plastic film to coat during extrusion, and the extruded and packaged stemming is cut and partitioned by adopting cutting equipment along with the extrusion length so as to be beneficial to later use;
and 7: the stemming packaged by the plastic film needs to be subjected to a proper stemming standing process for 24-48 hours to stabilize good invasion between the binding agent and the raw materials, and the stemming can be placed into a nylon bag to be packaged in the process;
the stemming produced by the steps comprises the following components in percentage by mass: al (Al)2O3 25-29%、SiO2 17-21%、SiC 21-26%、Si3N43 to 7 percent and 5 to 7 percent of F.C, under the condition of 1200 ℃ for 3 hours, the stemming has the volume specific gravity of 2.26, the apparent porosity of 22.4 percent, the bending strength of 11.9 MPa and the compression strength of 23.1 MPa.
Claims (1)
1. A preparation method of high-stability stemming for a COREX furnace taphole is characterized by comprising the following preparation steps: step 1: the granularity inspection of the raw materials determines that the granularity of the powder and the aggregate is proper, and the powder can be used as a good adhesion base material of the bonding agent; step 2: weighing, proportioning and mixing the raw materials, controlling the batch weight, mixing and weighing the raw materials, mixing the raw materials according to the proportion of the normal production stemming, uniformly mixing and stirring the raw materials in a forced stirrer for 3 to 5min, ensuring the sufficient mixing property and eliminating the operation segregation between aggregate and fine powder; and step 3: stirring the mixed materials for enough time, adding a bonding agent for bonding various raw materials, controlling the temperature of the bonding agent at 25-30 ℃, and selecting the bonding agent compounded by tar and resin as the bonding agent; and 4, step 4: stirring and grinding the mud, namely, grinding and stirring the combined stemming by using an edge runner mill for 20-25 minutes, wherein the temperature of the mud needs to be controlled to be about 25-30 ℃; and 5: extruding and molding the stemming, pouring the stemming which is well rolled and stirred into a stemming extruder for extruding, and extruding the stemming uniformly and stably in a strip shape; step 6: and (3) stemming packaging and cutting, namely packaging the stemming by wrapping the stemming with a plastic film while extruding, and cutting and partitioning the extruded and packaged stemming by using a cutting device along with the extruded length so as to be beneficial to the later useThe product is used for a long time; and 7: the stemming packaged by the plastic film needs to be subjected to a proper stemming standing process for 24-48 hours to stabilize good invasion between the binding agent and the raw materials, and the stemming can be placed into a nylon bag to be packaged in the process; the stemming produced by the steps comprises the following components in percentage by mass: al (Al)2O3 25-29%、SiO2 17-21%、SiC 21-26%、Si3N43 to 7 percent and 5 to 7 percent of F.C, under the condition of 1200 ℃ for 3 hours, the stemming has the volume specific gravity of 2.26, the apparent porosity of 22.4 percent, the bending strength of 11.9 MPa and the compression strength of 23.1 MPa.
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Application publication date: 20211207 |