CN1290671A - Blast furnace taphole stemming with low water content and its preparing method - Google Patents
Blast furnace taphole stemming with low water content and its preparing method Download PDFInfo
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- CN1290671A CN1290671A CN 00130242 CN00130242A CN1290671A CN 1290671 A CN1290671 A CN 1290671A CN 00130242 CN00130242 CN 00130242 CN 00130242 A CN00130242 A CN 00130242A CN 1290671 A CN1290671 A CN 1290671A
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Abstract
The blast furnace taphole stemming is prepared by using waste coke powder, clay, alumina, asphalt powder, organic water reducing agent, inorganic water reducing agent, kyanite and water and through the steps of crushing, sieving, pre-mixing, pugging and kneading. Using waste coke powder, one industrial waste, as main material can reduce production cost greatly. The stemming has excellent plasticity as well as high high-temperature strength, high mechanical scour resistance and good chemical corrosion resisting performance and may be used in blast furnace requiring high yield and heavy blast.
Description
The invention relates to a refractory pug for an iron blocking port in blast furnace production and a preparation method thereof, in particular to low-water stemming for a small and medium-sized blast furnace and a preparation method thereof, belonging to the technical field of refractory materials.
At present, most of pugs for blocking iron notch in iron-smelting production of medium and small blast furnaces are water-containing stemming using water as a binder, which is prepared by using coke powder and clay as main raw materials, adding a certain amount of silicon carbide and asphalt, and adding water for mixing, wherein the water content is generally about 20%. The stemming has the following disadvantages in use: firstly, due to high water content and large clay consumption, high-temperature shrinkage is easy to generate, water drainage is slow, and the phenomena of iron moist and iron breakage are easy to occur; secondly, due to poor stemming thermal conductivity and uneven temperature of mud in the taphole, thermal stress is easily generated, the taphole is fractured, the overall strength is reduced, and unsintered areas and local wet mud phenomena exist; thirdly, the high-temperature strength is low, the mechanical scouring resistance of molten iron slag flow is poor, the depth of a taphole is not enough during tapping, so that tapping instability is caused, production coordination is not facilitated, and the maintenance difficulty of the taphole is increased; fourth, the resistance to chemical attack by slag is insufficient. After the slag begins to flow out, the diameter of the iron notch is sharply enlarged and even broken, so that the iron notch is greatly sprayed, and the safety of the stokehole workers is endangered. In addition, the cost of the stemming is high due to the high price of raw materials such as coke powder, silicon carbide and the like.
The invention aims to overcome the defects in the prior art and provide the low-water blast furnace taphole stemming and the preparation method thereof, so that the stemming has good plasticity, improves the high-temperature strength, the mechanical erosion resistance and the chemical erosion resistance, meets the requirements of blast furnace ironmaking production, and reduces the production cost.
The purpose of the invention can be realized by the following technical scheme:
the blast furnace taphole stemming with low water content comprises the following raw materials in parts by weight: 40-50 parts of waste coke powder, 25-30 parts of clay, 15-20 parts of high alumina bauxite, 6-8 parts of asphalt powder, 2-4 parts of organic water reducing agent, 0.2-0.5 part of inorganic water reducing agent, 4-7 parts of kyanite and 14-18 parts of water.
In the low-water blast furnace taphole stemming, the organic water reducing agent is anthracene oil or silicone oil;
in the low-water blast furnace taphole stemming, the inorganic water reducing agent is sodium tripolyphosphate;
the raw materials of the low-water blast furnace taphole stemming can also be added with bentonite with the weight unit less than 4.
The chemical components, physicochemical indexes and particle size requirements of the raw materials of the low-water blast furnace taphole stemming are shown in tables 1 and 2.
Chemical composition and physical and chemical indexes (weight%) of raw materials used in Table 1
Table 2 particle size requirements of the raw materials used
| Name (R) | Waste coke powder | Clay clay | High alumina bauxite | Kyanite | Asphalt powder | Inorganic water reducing agent |
| Fineness of fineness | ≤6mm | 150- | 0.5-3.0mm | 150- | ≤1mm | Less than or equal to 150 meshes |
The preparation method of the stemming sequentially comprisesthe following steps: crushing, sieving, premixing, mixing and pugging.
The crushing and screening process comprises the steps of crushing the waste coke powder in the raw materials according to the granularity required by the table 2, and screening undersize materials; the oversize is re-crushed and homogenized.
The premixing procedure is to mix 4 to 7 parts of kyanite powder, 0.2 to 0.5 part of inorganic water reducing agent and 6 to 8 parts of asphalt powder (by weight unit) and stir the mixture evenly to prepare premixed powder;
the mixing procedure is that 40-50 parts (weight units) of waste coke powder, 15-20 parts of high alumina bauxite, 25-30 parts of clay and the premixed powder are sequentially added into a mud mill, 9.5-12 parts of water is added, after mixing is carried out for 5 minutes, an organic water reducing agent is continuously added for 2-4 mixing for 3 minutes, 4.5-6 parts of water is added, and mixing is carried out for 10-15 minutes;
the mud trapping process is to place the well ground stemming into a mud-saving pool for trapping, wherein the humidity of the mud-saving pool is more than 80%, the temperature is not lower than 10 ℃, and the trapping time is not lower than 30 hours.
The invention uses the waste coke powder to replace the high-price main raw materials of coke powder and silicon carbide in the existing water stemming. The waste coke powder is a cheap industrial byproduct, and is a waste heat-insulating material in the production of graphite electrodes. In the production process of graphite electrode, coke powder with fixed carbon content more than 80% and litz sand are used as heat-insulating filler to be added around the electrode for preventing graphite electrode from being oxidizedAnd (5) melting and preserving heat. When the electrode is electrified, the following reactions occur at2000-2500 ℃:
after the graphite electrode finished product is taken out, the filling material becomes waste, and the measurement shows that the content of SiC can reach 25% -50%, the fixed carbon is kept between 40% -55%, and in addition, part of quartz and graphite are still contained.
The silicon carbide of the waste coke powder has the advantages of good heat conductivity, stable high-temperature performance, high temperature resistance and chemical corrosion resistance, can ensure that the heat distribution of pug in an iron notch is uniform, avoid the pug fracture phenomenon caused by uneven thermal stress, and promote the rapid removal of water;
the quartz sand in the waste coke powder is also an excellent refractory raw material for stemming. The silicon dioxide in the quartz sand is required to react with the high-alumina bauxite and the aluminum oxide in the clay to generate mullite under the action of a sintering agent, and the factors are favorable for removing water and keeping the stemming to have good high-temperature performance;
the graphite in the waste coke powder is a carbon raw material which is better than coke, has good thermal conductivity and high-temperature volume stability, is not wetted by molten iron of slag, and can improve the plasticity of the stemming because of the lubricating property of the graphite.
The invention adopts organic and inorganic composite water reducing agents to reduce the water content of the stemming and ensure the rapid drying of the stemming, the two water reducing agents act together to ensure the stemming to keep good plasticity when the water content is low, the organic water reducing agent has the functions of adsorption, dispersion, lubrication and wetting on materials and can influence the ξ potential change of the stemming, thereby achieving the purpose of reducing the water consumption.
The high-alumina bauxite selected by the invention is a very good neutral refractory material, and the overall high-temperature performance of the stemming can be greatly improved by utilizing the advantages of high refractoriness, stable high-temperature volume, chemical erosion resistance and scouring resistance.
The expanding agent used in the invention is kyanite with a molecular formula of Al2O3·SiO2. The refractoriness under load and compressive strength of the unshaped refractory can be improved, and the linear deformation index after firing can be improved. When the stemming is heated to about 1300 ℃, an irreversible mullite phenomenon occurs, and simultaneously great permanent expansion occurs, so that high-temperature volume shrinkage generated by minerals such as clay and the like is compensated, the stemming keeps better volume stability, cracks caused by shrinkage are eliminated, and the phenomenon of iron notch breaking is avoided.
The binder used in the present invention is a combination of clay and asphalt powder. The quality of the combined clay meets the special grade requirement of soft clay in ZBQ42001-85 standard, and the main mineral is kaolinite which has good dispersibility, plasticity and sintering property. The invention utilizes the high dispersion degree of the stemming to improve the binding force and the drying strength of the stemming. The asphalt used in the invention is medium temperature asphalt, the asphalt powder with smaller granularity is uniformly distributed in the pug, and after the asphalt is thrown into the taphole, the asphalt begins to soften and volatilize in the process of temperature rise, and finally forms a carbon skeleton to combine the materials. In the process, due to combustion volatilization and carbonization of the asphalt and the organic water reducing agent, the temperature of the material is increased, the water discharge is accelerated, and after volatile matters are volatilized, micro-pores are formed, so that the water discharge is facilitated.
In order to promote the low-temperature sintering of the stemming, a sintering agent bentonite is added. The bentonite is clay mineral with montmorillonite as main mineral component and has chemical formula of Al2O3·4SiO2·nH2O, which has strong water absorption, cation exchange capacity, expansibility, plasticity and binding capacity, because the impurities contain K+、Na+So that a liquid phase appears at low temperature, so that the stemming is filled with the liquid phaseThe other components are sintered at low temperature. Meanwhile, the bentonite can also increase the plasticity of the pug and improve the operating performance of the pug.
The performance indexes of the stemming are as follows:
bulk density (110 ℃ C.. times.24 h): 1.55 g/cm3(ii) a Reducing the weight by burning: less than 45 percent; external water addition amount: 12% -14%;
and (3) shrinking after the stemming is dried: less than 1.5 percent; 1250 ℃ X2 h apparent porosity: 35 percent; degree of refractoriness: more than 1580 ℃;
room temperature compressive strength after heating to 1250 ℃ for 2 h: plasticity index of more than 2.5 Mpa: greater than 3.0
The water content of the stemming is kept about 13 percent, and compared with the common water stemming, the stemming has good plasticity, excellent high-temperature strength, mechanical erosion resistance and chemical erosion resistance, ensures that the depth of an iron notch is kept stable, ensures that the iron flow is very stable in the iron tapping process, meets the requirementsof blast furnace iron making, strong wind and high yield, better utilizes industrial waste, namely waste coke powder, has simple process, greatly reduces the production cost and has obvious economic benefit.
The present invention will be further described in detail with reference to the following examples:
example 1:
the raw materials are proportioned as follows (weight unit): 40 parts of waste coke powder, 34 parts of clay, 19 parts of bauxite, 6 parts of asphalt powder, 3 parts of anthracene oil, 0.25 part of sodium tripolyphosphate, 5 parts of kyanite and 18 parts of water.
The granularity of the raw materials is as follows: waste coke powder of 6mm, clay of 180 meshes, high-alumina bauxite of 0.5-3 mm, asphalt powder of less than 1mm, kyanite of 150 meshes
Example 2:
the raw materials are proportioned as follows (weight unit): waste coke powder 43, clay 30, bauxite 16, asphalt powder 6, silicone oil 3.5, sodium tripolyphosphate 0.3, kyanite 6.5 and water 14.
The granularity of the raw materials is as follows: waste coke powder is less than or equal to 4mm, clay is 150 meshes, high-alumina bauxite is 1-3mm, asphalt powder is less than or equal to 1mm, and kyanite is 170 meshes.
Example 3:
the raw materials are proportioned as follows (weight unit): waste coke powder 49, clay 25, high bauxite 15, asphalt powder 8, anthracene oil 2, sodium tripolyphosphate 0.45, kyanite 4 and water 16.
The granularity of the raw materials is as follows: waste coke powder is less than or equal to 3mm, clay is 150 meshes, high-alumina bauxite is 1-3mm, asphalt powder is less than or equal to 0.5mm, and kyanite is 170 meshes.
Example 4:
the raw materials are proportioned as follows (weight unit): 45 parts of waste coke powder, 25 parts of clay, 20 parts of high bauxite, 8 parts of asphalt powder, 2 parts of anthracene oil, 0.4 part of sodium tripolyphosphate, 4 parts of kyanite, 3 parts of bentonite and 17 parts of water.
The granularity of the raw materials is as follows: waste coke powder is less than or equal to 1mm, clay is 200 meshes, high-alumina bauxite is 1-3mm, asphalt powder is less than or equal to 1mm, kyanite is 180 meshes, and bentonite is 200 meshes.
Example 5:
the raw materials are proportioned as follows (weight unit): 50 parts of waste coke powder, 28 parts of clay, 15 parts of bauxite, 7 parts of asphalt powder, 4 parts of silicone oil, 0.48 part of sodium tripolyphosphate, 6.5 parts of kyanite, 2 parts of bentonite and 18 parts of water.
The granularity of the raw materials is as follows: waste coke powder is less than or equal to 0.5 mm, clay is 180 meshes, high-alumina bauxite is 1-3mm, asphalt powder is less than or equal to 0.1 mm, kyanite is 200 meshes, and bentonite is 180 meshes.
The preparation method of the stemming of each embodiment sequentially comprises the steps of crushing, screening, premixing, mixing and clay ageing to obtain the stemming.
Crushing and screening: crushing the raw materials according to the required granularity, and screening undersize;
premixing: mixing the sieved kyanite powder, the sodium tripolyphosphate and the asphalt powder according to the proportion, and uniformly stirring to prepare premixed powder;
mixing: adding the waste coke powder, the high alumina bauxite, the clay and the premixed powder into a mud mill according to the weight in turn, then adding 2/3 of the water amount, mixing for 5 minutes, continuing adding anthracene oil or silicone oil, mixing for 3 minutes, adding the rest water, and mixing for 10 minutes;
pugging: and putting the ground stemming into a mud-saving pool for ageing, wherein the humidity of the mud-saving pool is more than 80%, the temperature is not lower than 10 ℃, and the ageing time is not lower than 30 hours.
Claims (9)
1. The blast furnace taphole stemming with low water content is characterized in that the raw material mixture ratio of the stemming is as follows (weight unit): 40-50 parts of waste coke powder, 25-30 parts of clay, 15-20 parts of high alumina bauxite, 6-8 parts of asphalt powder, 2-4 parts of organic water reducing agent, 0.2-0.5 part of inorganic water reducing agent, 4-7 parts of kyanite and 14-18 parts of water.
2. The low water blast furnace taphole stemming as claimed in claim 1, characterized in that the raw material particle size of the stemming is less than or equal to 6mm of waste coke powder, 150-200 mesh clay, 0.5-3.0 mm of high alumina bauxite, 150-200 mesh kyanite, less than or equal to 1mm of asphalt powder, and less than or equal to 150 mesh inorganic water reducing agent.
3. The low-water blast furnace taphole stemming according to claim 1 or 2, characterized in that the organic water reducing agent is anthracene oil or silicone oil.
4. The low-water blast furnace taphole stemming according to claim 1 or 2, characterized in that the inorganic water reducing agent is sodium tripolyphosphate.
5. A low water blast furnace taphole stemming according to claim 1 or 2, characterized in that bentonite is added in the raw material<4 weight units.
6. A preparation method of low-water blast furnace taphole stemming comprises the working procedures of crushing and screening, premixing, mulling and mud trapping in sequence, wherein the crushing and screening working procedure comprises the steps of crushing all components of raw materials and screening undersize; the mud trapping process is to place the ground stemming into a mud-saving pool for trapping, wherein the humidity of the mud-saving pool is more than 80%, the temperature is not lower than 10 ℃, and the trapping time is not lower than 30 hours; the method is characterized in that the premixing procedure is to mix and stir 4 to 7 parts of screened kyanite powder, 0.2 to 0.5 part of inorganic water reducing agent and 6 to 8 parts of asphalt powder (by weight unit) uniformly to prepare premixed powder; and the mixing procedure is to sequentially add (by weight unit) 40-50 parts of waste coke powder, 15-20 parts of high-alumina bauxite, 25-30 parts of clay and the premixed powder into a mud mill, add 9.5-12 parts of water for mixing for 5 minutes, then continuously add 2-4 parts of an organic water reducing agent for mixing for 3 minutes, add 4.5-6 parts of the rest water, and mix for 10 minutes.
7. The method for preparing low water blast furnace taphole stemming as claimed in claim 6, wherein the raw material particle size of the stemming is that the waste coke powder is less than or equal to 6mm, the clay is 150-200 mesh, the bauxite is 0.5-3.0 mm, the kyanite is 150-200 mesh, the asphalt powder is less than or equal to 1mm, and the inorganic water reducing agent is less than or equal to 150 mesh.
8. The method for preparing the low-water blast furnace taphole stemming according to claim 6, characterized in that the organic water reducing agent is anthracene oil or silicone oil, and the inorganic water reducing agent is sodium tripolyphosphate.
9. The method for preparing low water blast furnace taphole stemming according to claim 6, wherein bentonite is added in the raw materials in an amount of less than 4 weight units.
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| CN00130242A CN1107662C (en) | 2000-11-02 | 2000-11-02 | Blast furnace taphole stemming with low water content and its preparing method |
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| CN00130242A CN1107662C (en) | 2000-11-02 | 2000-11-02 | Blast furnace taphole stemming with low water content and its preparing method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8062577B2 (en) | 2009-04-10 | 2011-11-22 | Edw. C. Levy Co. | Alumina taphole fill material and method for manufacturing |
| CN102584284A (en) * | 2012-01-30 | 2012-07-18 | 重庆生竹科技发展有限公司 | Anhydrous stemming for blast furnace |
| CN104446540A (en) * | 2014-11-19 | 2015-03-25 | 湖南湘钢瑞泰科技有限公司 | Anhydrous stemming and preparation method thereof |
| CN105777161A (en) * | 2014-07-16 | 2016-07-20 | 山国强 | Novel environment-friendly blast furnace taphole clay |
| CN109650855A (en) * | 2017-10-11 | 2019-04-19 | 河北丰能耐火材料股份有限公司 | A kind of composition of raw materials of anhydrous stemming and preparation method thereof |
| CN112624734A (en) * | 2020-12-12 | 2021-04-09 | 长兴云峰炉料有限公司 | Environment-friendly anhydrous stemming and preparation method thereof |
| CN114643338A (en) * | 2022-03-17 | 2022-06-21 | 重庆钢铁股份有限公司 | Method for increasing use times of flow nozzle of cast iron flow divider |
| CN115057712A (en) * | 2022-05-19 | 2022-09-16 | 徐州苏牌高温新材料有限公司 | Blast furnace stemming and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075475C (en) * | 1996-11-29 | 2001-11-28 | 王明贤 | Production process of water-less fire-resistant blasting slime |
| CN1064650C (en) * | 1998-04-23 | 2001-04-18 | 安阳钢铁股份有限公司 | High-strength water-containing stemming for taphole of blast furnace and its preparation |
-
2000
- 2000-11-02 CN CN00130242A patent/CN1107662C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8062577B2 (en) | 2009-04-10 | 2011-11-22 | Edw. C. Levy Co. | Alumina taphole fill material and method for manufacturing |
| US8216954B2 (en) | 2009-04-10 | 2012-07-10 | Edw. C. Levy Co. | Taphole fill material and method for manufacturing the same |
| CN102584284A (en) * | 2012-01-30 | 2012-07-18 | 重庆生竹科技发展有限公司 | Anhydrous stemming for blast furnace |
| CN105777161A (en) * | 2014-07-16 | 2016-07-20 | 山国强 | Novel environment-friendly blast furnace taphole clay |
| CN104446540A (en) * | 2014-11-19 | 2015-03-25 | 湖南湘钢瑞泰科技有限公司 | Anhydrous stemming and preparation method thereof |
| CN109650855A (en) * | 2017-10-11 | 2019-04-19 | 河北丰能耐火材料股份有限公司 | A kind of composition of raw materials of anhydrous stemming and preparation method thereof |
| CN112624734A (en) * | 2020-12-12 | 2021-04-09 | 长兴云峰炉料有限公司 | Environment-friendly anhydrous stemming and preparation method thereof |
| CN114643338A (en) * | 2022-03-17 | 2022-06-21 | 重庆钢铁股份有限公司 | Method for increasing use times of flow nozzle of cast iron flow divider |
| CN115057712A (en) * | 2022-05-19 | 2022-09-16 | 徐州苏牌高温新材料有限公司 | Blast furnace stemming and preparation method thereof |
| CN115057712B (en) * | 2022-05-19 | 2023-08-11 | 徐州苏牌高温新材料有限公司 | Blast furnace stemming and preparation method thereof |
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| CN1107662C (en) | 2003-05-07 |
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