CN108033783B - Blast furnace slag chute castable and preparation method thereof - Google Patents
Blast furnace slag chute castable and preparation method thereof Download PDFInfo
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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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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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Abstract
The invention belongs to the technical field of refractory materials, and particularly relates to a blast furnace slag chute castable and a preparation method thereof. The blast furnace slag chute castable comprises the following raw materials in percentage by weight: 20-23% of homogenized alumina with the particle size of more than 8mm and less than or equal to 12mm, 17-20% of homogenized alumina with the particle size of more than 3mm and less than or equal to 8mm, 8-12% of flint clay with the particle size of more than 1mm and less than or equal to 3mm, 9-11% of white corundum with the particle size of more than 0mm and less than or equal to 1mm, 9-10% of bauxite powder with the particle size of less than or equal to 0.074mm, 8-10% of white corundum powder with the particle size of less than or equal to 0.044mm, 8-10% of aluminum oxide micro powder with the particle size of less than or equal to 0.005mm, 5-10% of cement with the particle size of less than or equal to 0.074mm CA-70, 1-; additionally, 0.1-0.3 percent of industrial grade sodium hexametaphosphate, 0.3-0.6 percent of stainless steel fiber and 0.03-0.06 percent of explosion-proof fiber based on the total weight of the raw materials are added. The blast furnace slag chute castable has the characteristics of good anti-sticking performance, high strength, stable thermodynamic performance and the like.
Description
Technical Field
The invention belongs to the technical field of refractory materials related to blast furnace slag treatment, and particularly relates to a blast furnace slag chute castable and a preparation method thereof.
Background
Molten iron flows out of the tapping hole and is separated from slag, liquid slag is blocked into slag pots by a slag stacking gate through a slag discharging groove, for example, in a Xichang steel vanadium iron works, more than 30 slag pots are used for transporting blast furnace slag backwards, and after tapping, the slag pots filled with the blast furnace slag are transported to a blast furnace slag treatment site through a railway.
In order to reasonably process blast furnace slag, the iron and slag mixed and melted in a slag pot are fully recovered, the scouring force generated when the blast furnace slag is turned over is buffered, when the blast furnace slag is turned over, a chute with a certain inclination is arranged below the blast furnace slag, meanwhile, water is added to cool the blast furnace slag, a rotating device is arranged below the blast furnace slag to separate the mixed and melted iron slag, hard iron slag blocks are knocked to a far position after being collided, more and lighter slag falls to the right lower side after being collided, the slag can be used for producing light wall materials and brick materials, and the iron slag blocks are used for the next jaw breaking magnetic separation treatment.
The invention provides the chute castable with good thermal shock resistance, good scouring resistance, good anti-sticking performance and long service life, which is used for chute pouring.
Disclosure of Invention
The invention aims to provide a blast furnace slag chute castable for blast furnace slag treatment and a preparation method thereof, and the blast furnace slag chute castable can solve the problems of short service life, iron sticking, slag sticking and the like.
The blast furnace slag chute castable disclosed by the invention comprises the following raw materials in percentage by weight: 20-23% of homogenized alumina with the particle size of more than 8mm and less than or equal to 12mm, 17-20% of homogenized alumina with the particle size of more than 3mm and less than or equal to 8mm, 8-12% of flint clay with the particle size of more than 1mm and less than or equal to 3mm, 9-11% of white corundum with the particle size of more than 0mm and less than or equal to 1mm, 9-10% of bauxite powder with the particle size of less than or equal to 0.074mm, 8-10% of white corundum powder with the particle size of less than or equal to 0.044mm, 8-10% of aluminum oxide micro powder with the particle size of less than or equal to 0.005mm, 5-10% of cement with the particle size of less than or equal to 0.074mm CA-70, 1-; additionally, 0.1-0.3 percent of industrial grade sodium hexametaphosphate, 0.3-0.6 percent of stainless steel fiber and 0.03-0.06 percent of explosion-proof fiber based on the total weight of the raw materials are added.
Preferably, in the blast furnace slag chute castable, the homogenized alumina contains more than or equal to 89% of aluminum oxide.
Preferably, in the blast furnace slag chute castable, the flint clay contains more than or equal to 42% of aluminum oxide and less than or equal to 52% of silicon dioxide.
Preferably, in the blast furnace slag chute castable, the white corundum contains more than or equal to 98% of aluminum oxide.
Preferably, in the blast furnace slag chute castable, the alumina powder contains more than or equal to 85% of alumina.
Preferably, in the blast furnace slag chute castable, the white corundum powder contains more than or equal to 98% of aluminum oxide.
Preferably, in the blast furnace slag chute castable, the alumina micropowder is alpha Al2O3The content of aluminum oxide is more than or equal to 98 percent.
Preferably, in the blast furnace slag chute castable, the silicon dust contains silicon dioxide more than or equal to 94%.
Preferably, in the blast furnace slag chute castable, the CA-70 cement is calcium aluminate cement, and the content of aluminum oxide is more than or equal to 50%. Preferably, the CA-70 cement is calcium aluminate cement with the granularity less than or equal to 0.05 mm.
Preferably, in the blast furnace slag chute castable, the Guangxi white mud contains more than or equal to 30% of aluminum oxide and less than or equal to 45% of silicon dioxide.
Preferably, in the blast furnace slag chute castable, the sodium hexametaphosphate corresponds to the national standard HG/T2837-1997.
Preferably, in the blast furnace slag chute castable, the corresponding grade of the explosion-proof fiber is JX-3-3.
Preferably, in the blast furnace slag chute castable, the corresponding mark of the stainless steel fiber is 446.
Preferably, in the blast furnace slag chute castable, the blast furnace slag chute castable made of the raw materials comprises the following components: al (Al)2O3≥70％，SiO2≥10％，CaO≤1％。
Preferably, in the blast furnace slag chute castable, the water content of the blast furnace slag chute castable is less than or equal to 1%.
The raw material control can avoid the increase of processing cost caused by reworking after preparation due to unqualified raw materials.
The invention also provides a preparation method of the blast furnace slag chute castable, which comprises the following steps: mixing homogenized alumina, flint clay and white corundum, and then sequentially adding alumina powder, white corundum powder, aluminum oxide micro powder, CA-70 cement, micro silicon powder, Guangxi white mud, additive sodium hexametaphosphate, stainless steel fiber and explosion-proof fiber for stirring to obtain the blast furnace slag chute castable.
Preferably, in the preparation method, the total time of mixing and stirring is 5-8 min.
Further, in the preparation method, the homogenized alumina, the flint clay and the white corundum are mixed for 2-3 min, and then the alumina powder, the white corundum powder, the aluminum oxide micro powder, the Ca70 cement, the micro silicon powder, the Guangxi white mud, the additive sodium hexametaphosphate, the stainless steel fiber and the explosion-proof fiber are sequentially added to be mixed and stirred for 3-5 min.
Through reasonable formula design, the added flint clay has good thermal shock resistance, and the contained white corundum component has higher refractoriness; the composite binding agent of aluminum oxide micro powder, CA-70 cement and silicon dust powder is adopted, so that the castable not only has high normal-temperature and high-temperature strength, but also has better slag and iron adhesion resistance. The chute poured by the blast furnace slag chute castable has the characteristics of high refractoriness, high strength, good thermal shock resistance, slag adhesion resistance, excellent iron adhesion and the like. The blast furnace slag chute castable designed by the invention has the characteristics of good anti-sticking performance, high strength, stable thermodynamic performance and the like, and can effectively solve the problems of long slag sticking treatment time, low strength of the castable, low thermal shock resistance and the like of chutes when slag ladles are poured.
Detailed Description
The blast furnace slag chute castable comprises the following raw materials in percentage by weight: 20-23% of homogenized alumina with the particle size of more than 8mm and less than or equal to 12mm, 17-20% of homogenized alumina with the particle size of more than 3mm and less than or equal to 8mm, 8-12% of flint clay with the particle size of more than 1mm and less than or equal to 3mm, 9-11% of white corundum with the particle size of more than 0mm and less than or equal to 1mm, 9-10% of bauxite powder with the particle size of less than or equal to 0.074mm, 8-10% of white corundum powder with the particle size of less than or equal to 0.044mm, 8-10% of aluminum oxide micro powder with the particle size of less than or equal to 0.005mm, 5-10% of cement with the particle size of less than or equal to 0.074mm CA-70, 1-; additionally, 0.1-0.3 percent of industrial grade sodium hexametaphosphate, 0.3-0.6 percent of stainless steel fiber and 0.03-0.06 percent of explosion-proof fiber based on the total weight of the raw materials are added.
The preparation method of the blast furnace slag chute castable comprises the following steps:
a. controlling the content and the granularity of raw materials homogenized alumina, flint clay, white corundum, alumina powder, white corundum powder, aluminum oxide micro powder, CA70 cement, silicon dust powder, Guangxi white mud, additive sodium hexametaphosphate, stainless steel fiber and explosion-proof fiber according to requirements;
b. the 12mm-1mm aggregate part is sequentially sent into a drum mixer according to the proportion for mixing and stirring, and after mixing and stirring for a certain time, the bauxite powder, the white alundum powder, the aluminum oxide micro powder, the Ca70 cement, the silicon dust powder, the Guangxi white mud, the additive sodium hexametaphosphate, the stainless steel fiber and the explosion-proof fiber are sequentially added for stirring.
And (3) according to the actual production capacity, filling the aggregate particles into a barrel type stirrer for mixing and stirring, adding the powder and the additive for stirring after mixing and stirring for 2min, wherein the total stirring time is controlled to be 5-8 min, so that the aggregate particles can be uniformly mixed, and the stirring operation time is not too long.
And packaging the uniformly stirred raw materials by a three-way discharge valve.
The blast furnace slag chute castable prepared by the invention meets the following physicochemical indexes:
TABLE 1 blast furnace slag chute castable physicochemical index
The blast furnace slag chute castable of the invention adopts homogenized alumina, flint clay, white corundum, alumina powder and white corundum powder to provide Al for the selection of raw materials2O3Providing SiO by using flint clay and silicon dust2Cement is used to provide early construction strength, and alpha Al is used2O3The micro powder, Guangxi white mud and silicon dust powder serve as a binding agent, sodium hexametaphosphate is adopted to provide flow performance, the construction performance is enhanced, explosion-proof fibers are adopted to improve the transmission of water vapor in the baking process, the apparent porosity is reduced, and stainless steel fibers are adopted to be matched with Ca70 cement to increase the initial breaking strength and the medium-temperature breaking strength.
The homogenized alumina has the characteristics of strong acid and alkaline slag corrosion resistance, high-temperature strength and the like, but the thermal shock resistance of the homogenized alumina is poor. The flint clay has the characteristics of stable volume, high strength, low water absorption and the like after being calcined at high temperature, but the volume density is smaller. The white corundum has the characteristics of acid and alkali corrosion resistance, high temperature resistance, good thermal stability and the like. By combining the comprehensive excellent properties of the three refractory aggregates, researches show that the castable is poor in fluidity, poor in forming and easy to crack due to excessive aggregates; and the aggregate is too little, can make the casting material frame position weak, thereby influence high temperature mechanical properties, therefore the aggregate composition accounts for more suitable 65 ~ 70% of product proportion, and it mainly plays a support locking powder's effect in the initial stage, and high temperature in-process intensity also can be fine embodies in the later stage, stabilizes its life, and the proportion that refractory material miropowder accounts for about 30%, can form in the stirring process of adding water and melt the thick liquid, fills the gap at granule periphery, and has certain mobility and be convenient for the pouring construction.
However, the selection of the powder is also very important, for example, the selection of the refractory micro powder cannot be similar to or synchronous with the components of the particles, cracking will occur in the early and middle stages after the casting use, and the bonding property is poor. Alumina powder, white alundum powder and alpha Al2O3The micro powder mainly contains Al2O3The mullite phase is in a needle column shape, can effectively prevent the penetration of molten slag, simultaneously reduces the apparent porosity of the castable, improves the compressive strength of the castable, and improves the spalling resistance and the thermal shock stability of the castable.
The cement is calcium aluminate cement, wherein the content of alumina is about 70 percent, and the cement can be used as the cement of the invention, has stable hydration performance, excellent mechanical strength and proper strength improvement, and is suitable for being used as the blast furnace slag chute castable to provide early construction strength. In particular, the cement adopted by the invention is the Seka-brand Ca (aluminate-calcium) -70 aluminate cement, the alumina content of the cement is about 70%, and the cement has the characteristics of stable hydration performance, proper strength improvement, excellent mechanical strength and the like in the construction process.
Silicon dust and alpha Al2O3The micro powder, the bauxite powder and the white alundum powder simultaneously have certain binding performance in the hydration process, and can meet the construction pouring requirement without adding any binding agent component. The additive sodium hexametaphosphate is suitable for silicon-containing materials, has certain dispersibility and can improve the self-flowability of the castable. The explosion-proof fiber and the fine fibrous substance penetrate through all gaps of the casting material, and can conduct the discharge of water vapor in the baking process of the ladle pot, so that the phenomenon that the water vapor cannot be discharged and bursts to generate air holes is avoided. The stainless steel fiber combined with Ca70 cement can provide the casting material with higher initial strength and medium-temperature strength.
In the product and the method, the content, the proportion and the like are all weight percentages without special specification.
The invention will now be further described with reference to the following examples, but the invention is not limited thereto.
The physical and chemical indexes of the homogenized alumina, flint clay, white corundum, alumina powder, white corundum powder, aluminum oxide micro powder, silicon dust powder, Ca70 cement and Guangxi white mud adopted in the embodiment are shown in the following table 2:
TABLE 2 blast furnace slag chute castable raw material test results for experiments
Technical indexes of six raw materials in the examples are as follows: the homogenized alumina contains more than or equal to 89 percent of aluminum oxide by weight and has the granularity of 12-8mm and 8-3 mm respectively, the flint clay contains more than or equal to 45 percent of aluminum oxide by weight and less than or equal to 52 percent of silicon dioxide by weight and has the granularity of 3-1 mm; the white corundum contains more than or equal to 98 percent of aluminum oxide by weight and has the granularity of 0mm-1 mm; the bauxite powder contains more than or equal to 85 percent of aluminum oxide by weight and has the grain diameter of less than or equal to 0.074 mm; the white corundum powder contains more than or equal to 98 percent of aluminum oxide by weight and has the granularity of less than or equal to 0.044 mm; the silicon dust contains more than or equal to 94 percent of silicon dioxide by weight and has the granularity of less than or equal to 0.074 mm; the Guangxi white mud contains more than or equal to 30 percent of aluminum oxide and less than or equal to 45 percent of silicon dioxide by weight, and the granularity of the Guangxi white mud is less than or equal to 0.0074 mm; the Ca-70 cement is calcium aluminate cement, contains more than or equal to 50 percent of aluminum oxide by weight, and has the granularity of less than or equal to 0.05 mm; the alpha alumina micro powder contains more than or equal to 99 percent of alumina by weight and has the granularity of less than or equal to 0.005 mm.
Example 1
21 parts by weight of 8mm-12mm homogenized alumina, 19 parts by weight of 3-8mm homogenized alumina, 11 parts by weight of flint clay and 10 parts by weight of white corundum which are qualified in inspection are sent into a drum mixer to be mixed and stirred, after the mixture and the stirring are carried out for 2min, 9 parts by weight of alumina powder, 9 parts by weight of white corundum powder, 9 parts by weight of aluminum oxide micropowder, 8 parts by weight of Ca70 cement, 2 parts by weight of silicon dust powder, 2 parts by weight of Guangxi white mud and 0.2 part by weight of industrial grade sodium hexametaphosphate, 0.4 part by weight of stainless steel fiber and 0.04 part by weight of explosion-proof fiber are sent into the drum mixer to be mixed and stirred for 4min, the uniformly mixed materials are put into a dry ton bag packaging bag through a three-way valve discharging device, are packaged according to 500 kg/bag, an opening mark is tied and put in storage for standby, the physicochemical indexes of the high-chute castable are sampled and detected (the detection results are shown in Table 3), and after the detection is qualified, transporting the product to a blast furnace slag treatment site for use.
Blast furnace slag chute uses this embodiment blast furnace slag chute castable as fire-resistant castable, this 3 tons of blast furnace slag chute castable in blast furnace slag processing place of being sent to, the data after 3 chutes overhaul respectively and former chute overhaul data contrast have been collected, 3 individual chute construction conditions are good, all not fall the material in the maintenance process, the crackle phenomenon takes place, it increases to 200 by original 141.4 times to go up the line number of times of use average, it obviously reduces to be stained with sediment iron position during the whole, by original average 4.5, reduce to 2, and be stained with sediment iron layer cleaning time by original 2 hours less to 30 minutes, and whole chute all need not to produce the deformation, need not to change the chute steel sheet.
Table 3 example 1 blast furnace slag chute castable physical and chemical detection index
Example 2
Sending 22 parts by weight of 8mm-12mm homogenized alumina, 18 parts by weight of 3-8mm homogenized alumina, 12 parts by weight of flint clay and 9 parts by weight of white corundum which are qualified to be detected into a drum mixer for mixing and stirring, after mixing and stirring for 2min, sending 10 parts by weight of alumina powder, 8 parts by weight of white corundum powder, 10 parts by weight of aluminum oxide micropowder, 7 parts by weight of Ca70 cement, 2 parts by weight of silicon dust powder, 2 parts by weight of Guangxi white mud and 0.2 part by weight of industrial grade sodium hexametaphosphate as additive, 0.3 part by weight of stainless steel fiber and 0.05 part by weight of explosion-proof fiber into the drum mixer for mixing and stirring, after mixing and stirring for 4min, putting the uniformly mixed material into a dry ton bag packaging bag through a three-way valve discharging device, packaging according to 500 kg/bag, tying an opening mark for storage, sampling and detecting the physicochemical index of the high-chute castable (the detection result is shown in Table 4), and after the detection is qualified, transporting the product to a blast furnace slag treatment site for use.
Blast furnace slag chute uses this embodiment blast furnace slag chute castable as fire-resistant castable, this 3 tons of blast furnace slag chute castable in blast furnace slag processing place of being sent to, the data after 3 chutes overhaul respectively are collected and are compared with former chute overhaul data, 3 chute construction conditions are good, all there is not the material that falls in the maintenance process, the crackle phenomenon takes place, it increases to 212.3 times by original 141.4 times to go up the line number of times of use on average, it obviously reduces to be stained with sediment iron position during the whole period, by original average 4.5, reduce to 2.2, and be stained with sediment iron layer cleaning time by original 2 hours less to 30 minutes, and whole chute all does not have the production deformation, need not to change the chute steel sheet.
TABLE 4 EXAMPLE 2 blast furnace slag chute castable physical and chemical detection index
According to the background art of the present invention and the contents of embodiments 1 and 2, it can be concluded that: the blast furnace slag chute castable disclosed by the invention is good in application condition and construction on a chute for blast furnace slag treatment, the service cycle is obviously prolonged, the phenomenon of iron slag adhesion in the application process can be improved, the chute slag treatment time is shortened, the labor intensity is reduced, and the application prospect is wide.
Claims (6)
1. The blast furnace slag chute castable is characterized in that: the raw materials comprise the following components in percentage by weight: 20-23% of homogenized alumina with the particle size of more than 8mm and less than or equal to 12mm, 17-20% of homogenized alumina with the particle size of more than 3mm and less than or equal to 8mm, 8-12% of flint clay with the particle size of more than 1mm and less than or equal to 3mm, 9-11% of white corundum with the particle size of more than 0mm and less than or equal to 1mm, 9-10% of bauxite powder with the particle size of less than or equal to 0.074mm, 8-10% of white corundum powder with the particle size of less than or equal to 0.044mm, 8-10% of aluminum oxide micro powder with the particle size of less than or equal to 0.005mm, 5-10% of cement with the particle size of less than or equal to 0.074mm CA-70, 1-; additionally adding 0.1-0.3% of industrial grade sodium hexametaphosphate, 0.3-0.6% of stainless steel fiber and 0.03-0.06% of explosion-proof fiber based on the total weight of the raw materials; the homogenized alumina contains more than or equal to 89 percent of aluminum oxide; the flint clay contains more than or equal to 42 percent of aluminum oxide and less than or equal to 52 percent of silicon dioxide; the white corundum contains more than or equal to 98 percent of aluminum oxide; the alumina powder contains more than or equal to 85 percent of aluminum oxide; the content of aluminum oxide in the white corundum powder is more than or equal to 98 percent; the aluminum oxide micro powder is alpha Al2O3The content of aluminum oxide is more than or equal to 98 percent; the silicon dust contains silicon dioxide more than or equal to 94 percent; the CA-70 cement is calcium aluminate cement, and the content of aluminum oxide is more than or equal to 50 percent; the Guangxi white mud contains more than or equal to 30 percent of aluminum oxide and less than or equal to 45 percent of silicon dioxide; the blast furnace slag chute castable comprises the following components: al (Al)2O3≥70%，SiO2≥10%，CaO≤1%。
2. The blast furnace slag chute castable of claim 1, wherein: the granularity of the CA-70 cement is less than or equal to 0.05 mm.
3. The blast furnace slag chute castable according to claim 1 or 2, characterized by: the water content of the blast furnace slag chute castable is less than or equal to 1 percent.
4. A method for preparing a blast furnace slag chute castable according to any one of claims 1 to 3, characterized in that: the method comprises the following steps: mixing homogenized alumina, flint clay and white corundum, and then sequentially adding alumina powder, white corundum powder, aluminum oxide micro powder, CA-70 cement, silicon dust powder, Guangxi white mud, an additive sodium hexametaphosphate, stainless steel fiber and explosion-proof fiber for stirring to obtain the blast furnace slag chute castable.
5. The method for producing a blast furnace slag chute castable according to claim 4, characterized in that: the total time of mixing and stirring is 5-8 min.
6. The method for producing a blast furnace slag chute castable according to claim 5, characterized in that: firstly, homogenizing alumina, flint clay and white corundum are mixed for 2-3 min, and then alumina powder, white corundum powder, aluminum oxide micro powder, CA-70 cement, silicon dust powder, Guangxi white mud, an additive sodium hexametaphosphate, stainless steel fibers and explosion-proof fibers are sequentially added and mixed for 3-5 min.
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| CN109020516B (en) * | 2018-07-25 | 2021-01-29 | 河南中原黄金冶炼厂有限责任公司 | Novel baking-free and repairable chute |
| CN109534831A (en) * | 2018-12-05 | 2019-03-29 | 钢城集团凉山瑞海实业有限公司 | Half cylinder of steel permanent layer castable |
| CN111004022A (en) * | 2019-12-17 | 2020-04-14 | 钢城集团凉山瑞海实业有限公司 | Semi-steel tank slag line repairing material and preparation method thereof |
| CN110790580A (en) * | 2019-12-18 | 2020-02-14 | 钢城集团凉山瑞海实业有限公司 | High-temperature-resistant anti-burning sleeper protection castable |
| CN111484317A (en) * | 2020-05-09 | 2020-08-04 | 河南兴亚能源有限公司 | Homogenized alumina castable for blast furnace iron runner and preparation method thereof |
| CN112608129A (en) * | 2020-12-09 | 2021-04-06 | 钢城集团凉山瑞海实业有限公司 | Refractory material and preparation method thereof, high-temperature-resistant and burning-loss-preventing device for sleeper and preparation method thereof |
| CN113698186B (en) * | 2021-08-31 | 2022-12-13 | 浙江锦诚新材料股份有限公司 | Alumina-based cordierite explosion-proof castable |
| CN113896550B (en) * | 2021-11-19 | 2023-01-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Anti-bonding method for blast furnace slag chute |
| CN115385665B (en) * | 2022-09-15 | 2023-06-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Anti-adhesion method for blast furnace slag chute |
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