CN111592367B - Anhydrous stemming for blast furnace taphole - Google Patents
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- CN111592367B CN111592367B CN202010505163.0A CN202010505163A CN111592367B CN 111592367 B CN111592367 B CN 111592367B CN 202010505163 A CN202010505163 A CN 202010505163A CN 111592367 B CN111592367 B CN 111592367B
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Abstract
The invention discloses anhydrous stemming for a blast furnace taphole, which is prepared from recycled torpedo ladle lining bricks, iron runner castable, silicon carbide plates, silicon carbide carbon bricks, sliding plates, silicon mullite bricks, and finished raw materials of pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder, clay powder and mixed oil binder according to a certain weight part ratio. According to the material and the characteristics of the anhydrous stemming, the recycled refractory material with similar material is adopted to replace the original refractory material in a larger proportion, and meanwhile, non-refractory raw materials such as coke particles, sericite and the like which are required to be added in the production of the traditional anhydrous stemming are eliminated, so that the cost of the anhydrous stemming material is reduced, not only are valuable original mineral resources saved, but also the damage of the emission of industrial solid waste to the ecological environment is reduced, and the anhydrous stemming material conforms to the national resource recycling policy. The anhydrous stemming product prepared by the invention is practically used in front of a furnace, and the application effect of the anhydrous stemming product reaches and exceeds that of the existing anhydrous stemming product.
Description
Technical Field
The invention relates to a refractory material, in particular to anhydrous stemming for a blast furnace taphole.
Background
The tap hole is an important component of an iron-making blast furnace or an ore-smelting electric furnace and is a necessary channel for smelting products to flow out of a furnace body. The anhydrous stemming is a special refractory for plugging the tapping hole of the iron-making blast furnace or the ore-smelting electric furnace, and plays a role in opening and closing a slag iron outlet channel. In order to ensure the plugging effect, the anhydrous stemming product is required to have the performances of easy mud beating, tight plugging, stable mud bag, easy opening, stable taphole depth, no moist mud, scouring resistance, erosion resistance, long tapping time and the like, and simultaneously has the functions of effectively protecting the taphole area of the furnace hearth, stabilizing the tapping operation and improving the yield of molten iron.
At present, the anhydrous stemming sold in the market mostly adopts high-alumina bauxite, graphite, coke particles and 90-silicon carbide as main raw materials, the market price exceeds 3500-4000 yuan/ton, and the consumption of the anhydrous stemming is very large due to frequent opening and closing operations of a taphole, so that the production cost is high.
The used refractory materials are reasonably recycled, so that not only can the consumption of the raw materials be greatly reduced, but also the damage of industrial solid wastes to the ecological environment can be reduced. At present, research on used refractory materials is carried out in various countries in the world, the recovery rate of the refractory materials of foreign steel mills reaches 80 percent, and the recovery rate of the used refractory materials in China is only about 30 percent and is far lower than that of developed countries.
Torpedo ladle lining bricks, iron runner castable, silicon carbide plates, silicon carbide carbon bricks, sliding plates, silicon mullite bricks and the like are common refractory materials in the smelting industry, when equipment is maintained and repaired, some used refractory materials are replaced and abandoned, and if the used refractory materials can be used as raw materials of anhydrous stemming to be applied, the raw material cost of the anhydrous stemming can be greatly reduced.
Disclosure of Invention
The invention aims to provide the anhydrous stemming for the blast furnace taphole, which is prepared by taking a recycled refractory material as a raw material, aiming at the defect of high raw material cost of the existing anhydrous stemming, so that the raw material cost of the anhydrous stemming is reduced, and the damage of industrial solid waste discharge to the ecological environment is also reduced.
In order to achieve the purpose, the invention can adopt the following technical scheme:
the anhydrous stemming for a blast furnace taphole is prepared from recycled torpedo ladle lining bricks, iron runner castable, silicon carbide plates, silicon carbide carbon bricks, sliding plates, silicon mullite bricks, finished raw material pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder, clay powder and mixed oil binder according to the following weight parts:
30-50 parts of recycled torpedo ladle lining bricks, 25-40 parts of granules with the granularity of 0-4 mm and 5-10 parts of powder with the particle size of 200 meshes;
recovering 0-18 parts of the molten iron runner castable, wherein 0-8 parts of granular materials with the granularity of 0-4 mm and 0-10 parts of 120-mesh powder materials;
recovering 10-15 parts of silicon carbide plate and 120-mesh powder;
recovering 0-13 parts of silicon carbide carbon brick and granular materials with the granularity of 0-1 mm;
recovering 0-15 parts of sliding plate and granular materials with the granularity of 0-1 mm;
recovering 0-35 parts of silicon mullite brick and granular materials with the granularity of 1-4 mm;
0-13 parts of pyrophyllite and granular materials with the granularity of 0-1 mm;
0-12 parts of ferrosilicon nitride;
2-5 parts of high-temperature asphalt powder;
8-11 parts of 200-mesh clay powder;
the mixed oil binder accounts for 16 to 20 percent of the total weight of the materials.
It should be noted that: when the recycled sliding plate, the recycled silicon mullite brick and the pyrophyllite are zero at the same time, the recycled iron runner is poured, and the recycled silicon carbide carbon brick and the silicon nitride iron cannot be zero at the same time.
In order to ensure that the quality of the prepared anhydrous stemming product meets the use requirement, the quality requirements on the used reclaimed materials and finished raw materials are as follows:
al in recycled torpedo ladle lining brick used in the invention 2 O 3 ≥55%，SiC≥8%，C≥4%，Fe 2 O 3 ≤2.5%。
The invention uses Al in the recycled molten iron runner castable 2 O 3 ≥55%，SiC≥12%，C≥3%，Fe 2 O 3 ≤2.5%。
The SiC in the recycled silicon carbide plate used in the invention is more than or equal to 80 percent; the SiC content in the recycled silicon carbide carbon brick is more than or equal to 18 percent, and the C content is more than or equal to 55 percent.
Al in recycled sliding plate used in the invention 2 O 3 More than or equal to 65 percent, more than or equal to 4 percent of SiC, more than or equal to 6 percent of C; al in the recycled silicon mullite brick 2 O 3 ≥45%，SiO 2 ≥20%，SiC≥3%。
Al in pyrophyllite used in the present invention 2 O 3 ≥14%，SiO 2 More than or equal to 68 percent and less than or equal to 3 percent of water.
The silicon iron nitride used in the invention contains 45-50% of Si, 14-17% of Fe and 25-35% of N.
The softening point of the high-temperature asphalt powder used in the invention is more than or equal to 125 ℃, the fixed carbon is more than or equal to 58 percent, and the ash content is less than or equal to 0.6 percent.
Al in clay powder used in the invention 2 O 3 ≥30%，SiO 2 More than or equal to 50 percent and less than or equal to 3 percent of water.
The mixed oil binder used in the invention is prepared from coal tar and anthracene oil according to the weight ratio of 0.8-0.95.
Firstly, respectively detecting components of recycled torpedo ladle lining bricks, iron runner castable, silicon carbide plates, silicon carbide carbon bricks, sliding plates and silicon mullite bricks, sorting and removing impurities after the use requirements are met, respectively crushing the recycled materials and finished raw materials of pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder and clay powder into particles or/and powder meeting the requirements, respectively accurately weighing the recycled materials and the finished raw materials of pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder and clay powder, then putting the materials into a mixing mill, mixing, milling and stirring the materials, then adding a mixed oil binder, fully and uniformly mixing the materials, then forming the materials by a mud extruder to obtain finished products, and respectively wrapping the single materials by plastic films and then warehousing the finished products.
The invention has the advantages that according to the material and the characteristics of the anhydrous stemming, the recovered refractory material with similar material is adopted to replace the original refractory material in a larger proportion, simultaneously, the non-refractory raw materials such as coke particles, sericite and the like which are required to be added in the production of the traditional anhydrous stemming are cancelled, the cost of the anhydrous stemming material is reduced, not only is the precious original mineral resources saved, but also the damage of the emission of industrial solid waste to the ecological environment is reduced, and the anhydrous stemming material conforms to the national resource recycling policy.
The anhydrous stemming product prepared by the invention can meet the requirements of easy stemming, tight plugging, stable mud bag, easy opening, stable iron notch depth, no moist mud, erosion resistance, long tapping time and the like of the anhydrous stemming through the actual use before the furnace, has the application effect reaching and exceeding the existing anhydrous stemming product, but has the sale price of only 2500-3000 yuan/ton because of adding the recycled refractory material with a larger proportion, and is far lower than the anhydrous stemming product prepared by using the original refractory material. And meanwhile, the taphole area of the hearth can be effectively protected, the tapping operation is stabilized, and the molten iron output rate is improved.
Detailed Description
The present invention is described in more detail below with reference to specific examples to facilitate understanding for those skilled in the art.
The recycled refractory used in the invention comprises torpedo ladle lining bricks, iron runner castable, silicon carbide plates, silicon carbide carbon bricks, sliding plates and silicon mullite bricks, which are used as solid waste refractory in the industry, and when the recycled refractory is used, component detection is firstly carried out, and the recycled refractory can be used only after meeting the component requirements; the raw materials of pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder, clay powder and coal tar and anthracene oil for preparing the mixed oil binder are all commercial products.
The invention is illustrated in the following table 1 by way of three formulation examples:
TABLE 1
The physical and chemical indexes of the anhydrous stemming of the finished products 1 to 3 are shown in the following table 2:
TABLE 2
The indexes of the anhydrous stemming used conventionally are as follows: al (aluminum) 2 O 3 The content is 25 to 30 percent, the content of SiC and C is 25 to 40 percent, and the density is 1.8 to 2.0 g/cm 3 The strength is 6 to 12MPa.
As can be seen by comparing the data in the table 2 with the indexes of conventional products, the anhydrous stemming products 1 to 3# prepared by the method can meet the use requirements of a blast furnace taphole.
During specific preparation, according to actual use places, namely according to smelting process requirements, the recycled refractory and finished raw materials used in the invention can be properly adjusted within the range disclosed by the invention; if the recycling of iron runner castable and the recycling of silicon carbide bricks and ferrosilicon nitride are omitted, the use amounts of recycled silicon carbide plates, recycled sliding plates, recycled silicon mullite bricks and pyrophyllite are increased; when the recovery of a sliding plate and the recovery of the silicon mullite brick and the pyrophyllite are omitted, the recovery of torpedo ladle brick granules, the recovery of iron runner castable powder and the like are needed.
Claims (3)
1. The utility model provides a blast furnace is anhydrous stemming for tap hole which characterized in that: the material is prepared from recycled torpedo ladle lining bricks, iron runner castable, silicon carbide plates, silicon carbide carbon bricks, sliding plates, silicon mullite bricks, finished raw materials of pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder, clay powder and mixed oil binder according to the following weight parts:
30-50 parts of recycled torpedo ladle lining bricks, 25-40 parts of granules with the granularity of 0-4 mm and 5-10 parts of powder with the granularity of 200 meshes;
recovering 0-18 parts of the molten iron runner castable, wherein 0-8 parts of granular materials with the granularity of 0-4 mm and 0-10 parts of 120-mesh powder materials;
recovering 10-15 parts of silicon carbide plate and 120-mesh powder;
recovering 0-13 parts of silicon carbide carbon bricks and particles with the particle size of 0-1 mm;
recovering 0-15 parts of sliding plate and granular materials with the granularity of 0-1 mm;
recovering 0-35 parts of silicon mullite brick and granular materials with the granularity of 1-4 mm;
0-13 parts of pyrophyllite and granular materials with the granularity of 0-1 mm;
0-12 parts of ferrosilicon nitride;
2-5 parts of high-temperature asphalt powder;
8-11 parts of 200-mesh clay powder;
the mixed oil binder is added according to 16-20% of the total weight of the materials;
when the recycled sliding plate, the recycled silicon mullite brick and the pyrophyllite are zero at the same time, the recycled iron runner is poured, and the recycled silicon carbide carbon brick and the silicon nitride iron can not be zero at the same time;
the Al in the lining brick of the recycled torpedo ladle 2 O 3 ≥55%，SiC≥8%，C≥4%，Fe 2 O 3 ≤2.5%；
Recovering Al in the molten iron runner castable 2 O 3 ≥55%，SiC≥12%，C≥3%，Fe 2 O 3 ≤2.5%；
SiC in the recovered silicon carbide plate is more than or equal to 80 percent; the SiC content in the recycled silicon carbide carbon brick is more than or equal to 18 percent, and the C content is more than or equal to 55 percent;
recovering Al in the sliding plate 2 O 3 More than or equal to 65 percent, more than or equal to 4 percent of SiC, more than or equal to 6 percent of C; al in the recycled silicon mullite brick 2 O 3 ≥45%，SiO 2 ≥20%，SiC≥3%；
The leaf waxAl in stone 2 O 3 ≥14%，SiO 2 More than or equal to 68 percent, and the water content is less than or equal to 3;
the softening point of the high-temperature asphalt powder is more than or equal to 125 ℃, the fixed carbon is more than or equal to 58 percent, and the ash content is less than or equal to 0.6 percent;
al in the clay powder 2 O 3 ≥30%，SiO 2 More than or equal to 50 percent and less than or equal to 3 percent of water;
the mixed oil binder is coal tar and anthracene oil.
2. The waterless stemming as set forth in claim 1, wherein: in the ferrosilicon nitride, the Si content is 45-50%, the Fe content is 14-17%, and the N content is 25-35%.
3. The waterless stemming as set forth in claim 1, wherein: the mixed oil binder is prepared from 0.8-0.95 parts of coal tar and 0.05-0.2 parts of anthracene oil by weight.
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