CN103553646A - Cement-free castable for iron and steel smelting - Google Patents
Cement-free castable for iron and steel smelting Download PDFInfo
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Abstract
The invention discloses a cement-free castable for iron and steel smelting, alumina, chromium oxide, silicon oxide and silicon carbide are used as main raw materials, suitable raw materials, a ratio thereof and a corresponding preparation method are selected, and then the excellent-performance cement-free castable is obtained by controlling reasonable addition amount of the chromium oxide and the solid solution forming degree in aggregate.
Description
Technical field
The present invention relates to high-temperature wearable refractory castable technical field, particularly a kind of smelting iron and steel cement-free castable.
Background technology
Refractory castable is the important component part in refractory materials, excellent property not only, and production technique is simple, cost is low, be substituted traditional refractory brick material and be widely used in easy to wear, infiltration and the attack sites of Thermal Equipment for the smelting iron and steel such as blast furnace, converter, electric furnace, hotblast stove, smelting tundish, and these positions are key positions of smelting equipment, work-ing life and the utilising efficiency of smelting equipment will directly be affected.
Because the smelting process of iron and steel is used high-temperature slag in a large number, and the temperature of these slags is conventionally even higher 1400 ℃ of left and right, the key positions such as furnace lining of the metallurgical equipment therefore contacting with these slags must be able to tolerate the temperature of 1400 ℃ even higher, slag composition is mainly calcium oxide simultaneously, magnesium oxide etc., basicity is generally on the low side, erosion for refractory castable is very serious, add in smelting iron and steel and often will under the environment such as high temperature oxidation, use, therefore require refractory castable must possess outstanding high thermal resistance, erosion resistance, oxidation-resistance, explosion-proof performance etc.
And Cr in prior art
2o
3, ZrO
2deng refractory raw material, there is excellent impermeabilisation and erosion-resistant optimum feed stock, for example Chinese patent application CN201010535390.4 discloses a kind of mould material that aluminum oxide, chromic oxide and zirconium white be main raw material of take, yet its composition proportion is comparatively complicated, and need to add pure calcium aluminate cement, be unfavorable for the raising of its use temperature.Document < < chromic oxide is also pointed out the > > that affects of non-cement corundum castable material ore deposit phase, microstructure and intensity, Cr under high temperature
2o
3with Al
2o
3can form continuous solid solution, thereby the high-temperature behavior of chromium corundum goods is better than pure corundum products, its slag resistance is with Cr
2o
3the increase of content and strengthening, adds chromic oxide to have more excellent properties, and has studied the impact of chromic oxide on ore deposit phase composite, microstructure and the folding strength of non-cement corundum base mould material in corundum material.Yet it does not carry out more systematic research to the proportioning of mould material yet.
The application on the basis of above-mentioned research, researches and develops a kind of component relatively simple, and have excellent properties, can be applied to smelting equipment cement-free castable all completely.
Summary of the invention
Object of the present invention is to provide a kind of cement-free castable with excellent properties.
For achieving the above object, the technical solution used in the present invention is:
, it is prepared by following steps:
One), select aluminum oxide meal, silicon oxide fine powder and chromic oxide fine powder are prepared mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of silicon oxide fine powder is 10-20 μ m, the granularity of chromic oxide fine powder is 1-2/ μ m, three's the weight ratio of take is aluminum oxide meal: silicon oxide fine powder: chromic oxide fine powder=79-82:4-7:14-16 prepares burden, first aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 20-30min, and then silicon oxide fine powder is added in the powder after pre-mixing and proceeds to mix, mixing time 25-30min,
Two), by the compound obtaining sintering 2-2.5h at 1540-1560 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, the chromic oxide micro mist of joining again 40-45 part, the silicon carbide micro-powder of the alumina powder of 5-10 part and 3-5 part is as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8 μ m, the granularity of alumina powder is 3-6 μ m, the granularity of silicon carbide micro-powder is 0.5-2/ μ m, aggregate and matrix are mixed, stirring 30-60min mixes, then again with addition of take the water of 3-5 parts that aggregate total amount is 100 weight parts, continuation stirring 15-30min after vibration is poured mould into and is poured into a mould, the demoulding after placement 18-24h, be up to the standards and obtain finished product.
By the said products dry 24-36h at 120-130 ℃ of temperature, detection obtains product and has excellent hot-cracking resistance and working strength.
Advantage of the present invention is: adopted suitable raw material and proportioning thereof, and corresponding preparation method has obtained the cement-free castable of excellent performance.
Embodiment
Below, by concrete experimental example, the present invention is described in detail.
Experimental example 1.
One), select aluminum oxide meal, silicon oxide fine powder and chromic oxide fine powder to prepare mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of silicon oxide fine powder is 10-20/ μ m, the granularity of chromic oxide fine powder is 1-2 μ m, three's the weight ratio of take is aluminum oxide meal: silicon oxide fine powder: chromic oxide fine powder=79:4:14 prepares burden, first aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 25min, and then silicon oxide fine powder is added in the powder after pre-mixing and proceeds to mix, mixing time 30min;
Two), by the compound obtaining sintering 2h at 1540 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, join again the silicon carbide micro-powder of the chromic oxide micro mist of 40 parts, the alumina powder of 10 parts and 3 parts as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8 μ m, the granularity of alumina powder is 3-6 μ m, the granularity of silicon carbide micro-powder is 0.5-2 μ m, aggregate and matrix are mixed, stirring 50min mixes, then again with addition of take the water of 4 parts that aggregate total amount is 100 weight parts, continuation stirring 20min after vibration is poured mould into and is poured into a mould, and after placement 24h, the demoulding obtains product.
Experimental example 2.
One), select aluminum oxide meal, silicon oxide fine powder and chromic oxide fine powder to prepare mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of silicon oxide fine powder is 10-20 μ m, the granularity of chromic oxide fine powder is 1-2 μ m, three's the weight ratio of take is aluminum oxide meal: silicon oxide fine powder: chromic oxide fine powder=80:5:15 prepares burden, first aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 25min, and then silicon oxide fine powder is added in the powder after pre-mixing and proceeds to mix, mixing time 30min;
Two), by the compound obtaining sintering 2.3h at 1550 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, join again the silicon carbide micro-powder of the chromic oxide micro mist of 43 parts, the alumina powder of 7 parts and 4 parts as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8 μ m, the granularity of alumina powder is 3-6 μ m, the granularity of silicon carbide micro-powder is 0.5-2 μ m, aggregate and matrix are mixed, stirring 50min mixes, then again with addition of take the water of 4 parts that aggregate total amount is 100 weight parts, continuation stirring 20min after vibration is poured mould into and is poured into a mould, and after placement 24h, the demoulding obtains product.
Experimental example 3.
One), select aluminum oxide meal, silicon oxide fine powder and chromic oxide fine powder to prepare mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of silicon oxide fine powder is 10-20/ μ m, the granularity of chromic oxide fine powder is 1-2 μ m, three's the weight ratio of take is aluminum oxide meal: silicon oxide fine powder: chromic oxide fine powder=82:7:16 prepares burden, first aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 25min, and then silicon oxide fine powder is added in the powder after pre-mixing and proceeds to mix, mixing time 30min;
Two), by the compound obtaining sintering 2.5h at 1560 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, join again the silicon carbide micro-powder of the chromic oxide micro mist of 45 parts, the alumina powder of 5 parts and 5 parts as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8/ μ m, the granularity of alumina powder is 3-6 μ m, the granularity of silicon carbide micro-powder is 0.5-2 μ m, aggregate and matrix are mixed, stirring 50min mixes, then again with addition of take the water of 4 parts that aggregate total amount is 100 weight parts, continuation stirring 20min after vibration is poured mould into and is poured into a mould, and after placement 24h, the demoulding obtains product.
Experimental example 4.
One), select aluminum oxide meal, silicon oxide fine powder and chromic oxide fine powder to prepare mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of silicon oxide fine powder is 10-20 μ m, the granularity of chromic oxide fine powder is 1-2 μ m, three's the weight ratio of take is aluminum oxide meal: silicon oxide fine powder: chromic oxide fine powder=80:5:10 prepares burden, first aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 25min, and then silicon oxide fine powder is added in the powder after pre-mixing and proceeds to mix, mixing time 30min;
Two), by the compound obtaining sintering 2.3h at 1550 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, join again the silicon carbide micro-powder of the chromic oxide micro mist of 35 parts, the alumina powder of 7 parts and 4 parts as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8 μ m, the granularity of alumina powder is 3-6 μ m, the granularity of silicon carbide micro-powder is 0.5-2 μ m, aggregate and matrix are mixed, stirring 50min mixes, then again with addition of take the water of 4 parts that aggregate total amount is 100 weight parts, continuation stirring 20min after vibration is poured mould into and is poured into a mould, and after placement 24h, the demoulding obtains product.
Experimental example 5.
One), select aluminum oxide meal, silicon oxide fine powder and chromic oxide fine powder to prepare mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of silicon oxide fine powder is 10-20/ μ m, the granularity of chromic oxide fine powder is 1-2 μ m, three's the weight ratio of take is aluminum oxide meal: silicon oxide fine powder: chromic oxide fine powder=80:5:20 prepares burden, first aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 25min, and then silicon oxide fine powder is added in the powder after pre-mixing and proceeds to mix, mixing time 30min;
Two), by the compound obtaining sintering 2.3h at 1550 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, join again the silicon carbide micro-powder of the chromic oxide micro mist of 50 parts, the alumina powder of 7 parts and 4 parts as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8/ μ m, the granularity of alumina powder is 3-6/ μ m, the granularity of silicon carbide micro-powder is 0.5-2 μ m, aggregate and matrix are mixed, stirring 50min mixes, then again with addition of take the water of 4 parts that aggregate total amount is 100 weight parts, continuation stirring 20min after vibration is poured mould into and is poured into a mould, and after placement 18-24h, the demoulding obtains product.
Experimental example 6.
One), select aluminum oxide meal, silicon oxide fine powder and chromic oxide fine powder to prepare mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of silicon oxide fine powder is 10-20 μ m, the granularity of chromic oxide fine powder is 1-2 μ m, three's the weight ratio of take is aluminum oxide meal: silicon oxide fine powder: chromic oxide fine powder=80:5:15 prepares burden, first aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 25min, and then silicon oxide fine powder is added in the powder after pre-mixing and proceeds to mix, mixing time 30min;
Two), by the compound obtaining sintering 2h at 1500 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, join again the silicon carbide micro-powder of the chromic oxide micro mist of 43 parts, the alumina powder of 7 parts and 4 parts as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8 μ m, the granularity of alumina powder is 3-6 μ m, the granularity of silicon carbide micro-powder is 0.5-2 μ m, aggregate and matrix are mixed, stirring 50min mixes, then again with addition of take the water of 4 parts that aggregate total amount is 100 weight parts, continuation stirring 20min after vibration is poured mould into and is poured into a mould, and after placement 24h, the demoulding obtains product.
Experimental example 7.
One), select aluminum oxide meal, silicon oxide fine powder and chromic oxide fine powder to prepare mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of silicon oxide fine powder is 10-20 μ m, the granularity of chromic oxide fine powder is 1-2 μ m, three's the weight ratio of take is aluminum oxide meal: silicon oxide fine powder: chromic oxide fine powder=80:5:15 prepares burden, first aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 25min, and then silicon oxide fine powder is added in the powder after pre-mixing and proceeds to mix, mixing time 30min;
Two), by the compound obtaining sintering 2.5h at 1600 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, join again the silicon carbide micro-powder of the chromic oxide micro mist of 43 parts, the alumina powder of 7 parts and 4 parts as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8 μ m, the granularity of alumina powder is 3-6 μ m, the granularity of silicon carbide micro-powder is 0.5-2/ μ m, aggregate and matrix are mixed, stirring 50min mixes, then again with addition of take the water of 4 parts that aggregate total amount is 100 weight parts, continuation stirring 20min after vibration is poured mould into and is poured into a mould, and after placement 24h, the demoulding obtains product.
Experimental example 8.
One), select aluminum oxide meal and chromic oxide fine powder to prepare mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of chromic oxide fine powder is 1-2 μ m, take weight ratio as aluminum oxide meal: chromic oxide fine powder=80:15 prepares burden, aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 25min;
Two), by the compound obtaining sintering 2.3h at 1550 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, join again the alumina powder of the chromic oxide micro mist of 43 parts and 7 parts as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8 μ m, and the granularity of alumina powder is 3-6 μ m, and aggregate and matrix are mixed, stirring 50min mixes, then again with addition of take the water of 4 parts that aggregate total amount is 100 weight parts, continue to stir 20min after vibration and pour mould into and pour into a mould, place 24h after the demoulding obtain product.
Mould material casting is obtained to sample 120 ℃ of insulation 24h dry for standby.
Hot-cracking resistance: sample is heated to 1500 ℃ and keeps 30min, take out subsequently sample and throw in cold water and keep 5 minutes, after sample takes out, at normal temperature, place after 30min, repeat after above-mentioned heating, cooling operation 20 times, weighing sample is weightless, and calculate rate of weight loss as the rate of peeling off to investigate hot-cracking resistance.
Resistance to fouling and perviousness: adopt and contain silicon oxide, aluminum oxide, ferric oxide, titanium oxide, chromic oxide, calcium oxide, magnesium oxide, potassium oxide, sodium oxide, manganese oxide, cupric oxide, zinc oxide, sulphur trioxide, and fluorine and chlorine element from slag material as slag, sample is put into rotary kiln, use from slag material simultaneously and cover sample, rotating speed with 10rpm/min rotates back to converter, in the situation that passing into oxygen and propane burning gas, furnace temperature is remained on to 20h at 1600 ℃, every two hours change slag slag once during this time, take out afterwards sample, observe and measure erosion layer and pervious course thickness, and take the corroding thickness of experimental example 2 and infiltration thickness be 1 other samples of calculating erosion ratio and rate of permeation.
Apparent porosity: record after 1600 ℃ of sintering 3h.
Folding strength: record after 1500 ℃ of sintering 2h.
Table 1
| ? | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Peel off rate (wt%) | 1.2 | 1.2 | 1.1 | 1.5 | 2.5 | 1.6 | 1.2 | 1.4 |
| Resistance to fouling | 0.95 | 1 | 1.02 | 2.10 | 1.05 | 1.05 | 1.10 | 1.33 |
| Permeability resistance | 1.01 | 1 | 0.97 | 1.10 | 1.35 | 1.02 | 1.01 | 1.28 |
| Apparent porosity (%) | 15.8 | 15.4 | 15.2 | 17.1 | 17.6 | 18.5 | 16.2 | 15.9 |
| Folding strength (MPa) | 20 | 21 | 21 | 12 | 22 | 14 | 21 | 19 |
Known by the result in table 1, the addition of chromic oxide in aggregate, and the sintering temperature of aggregate and time, all the performance for mould material has material impact.
For hot-cracking resistance, chromic oxide needs fully to form sosoloid in aggregate, thereby improves hot-cracking resistance, yet the content of chromic oxide in aggregate is also unsuitable too high, otherwise can cause mould material integrated oxidation chromium content higher, causes on the contrary hot-cracking resistance variation.Correspondingly, the sintering temperature of aggregate and sintering time also must strict be controlled, to guarantee can form a considerable amount of sosoloid in aggregate but also the chromic oxide of remaining some amount.
For resistance to fouling, in order to make can fully to form sosoloid in mould material aggregate, and the chromic oxide content that guarantees mould material integral body, to obtain excellent performance, the ratio of chromic oxide in aggregate can not be very few, yet the resistance to fouling that in aggregate, too much chromic oxide can make aggregate continuous solid solution is too excellent, affect the resistance to fouling of mould material integral body, correspondingly, the sintering temperature of aggregate and sintering time also must strict be controlled, to guarantee can form a considerable amount of sosoloid in aggregate but also the chromic oxide of remaining some amount.
For permeability resistance, chromic oxide needs fully to form sosoloid in aggregate, to obtain low apparent porosity, thereby raising permeability resistance, yet the content of chromic oxide in aggregate is also unsuitable too high, otherwise can cause mould material integrated oxidation chromium content higher, causes on the contrary permeability resistance variation.Correspondingly, the sintering temperature of aggregate and sintering time also must strict be controlled, to guarantee can form a considerable amount of sosoloid in aggregate but also the chromic oxide of remaining some amount.
For intensity, chromic oxide needs fully to form sosoloid in aggregate, to realize better particle combination between mould material.
From the above results, analyzed, just based on the suitable proportioning raw materials of the application and preparation technology, obtained the cement-free castable of excellent performance, can finely be applicable to the harsh and unforgiving environments of field of metallurgy.
Claims (3)
1. a cement-free castable, it is prepared by following steps:
One), select aluminum oxide meal, silicon oxide fine powder and chromic oxide fine powder are prepared mould material aggregate as raw material, wherein the granularity of aluminum oxide meal is less than 1mm, the granularity of silicon oxide fine powder is 10-20/ μ m, the granularity of chromic oxide fine powder is 1-2 μ m, three's the weight ratio of take is aluminum oxide meal: silicon oxide fine powder: chromic oxide fine powder=79-82:4-7:14-16 prepares burden, first aluminum oxide meal and chromic oxide fine powder are carried out to pre-mixing, mixing time 20-30min, and then silicon oxide fine powder is added in the powder after pre-mixing and proceeds to mix, mixing time 25-30min,
Two), by the compound obtaining sintering 2-2.5h at 1540-1560 ℃, then grind, obtaining granularity is the mould material aggregate of 2-3mm;
Three), take two) mould material aggregate total amount is 100 weight parts in step, the chromic oxide micro mist of joining again 40-45 part, the silicon carbide micro-powder of the alumina powder of 5-10 part and 3-5 part is as matrix, wherein the granularity of chromic oxide micro mist is 0.5-0.8 μ m, the granularity of alumina powder is 3-6 μ m, the granularity of silicon carbide micro-powder is 0.5-2 μ m, aggregate and matrix are mixed, stirring 30-60min mixes, then again with addition of the water of take 3-5 part that aggregate total amount is 100 weight parts, continuation stirring 15-30min after vibration is poured mould into and is poured into a mould, the demoulding after placement 18-24h, be up to the standards and obtain finished product.
2. cement-free castable according to claim 1, is characterized in that: aluminum oxide meal in preferred aggregate: silicon oxide fine powder: chromic oxide fine powder=80:5:1.
3. cement-free castable according to claim 1, is characterized in that: preferably two) in step, sintering temperature is 1550 ℃, sintering time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735149A (en) * | 2016-12-06 | 2017-05-31 | 武汉威林科技股份有限公司 | A kind of construction method of the integrated poured tundish permanent layer of the high alumina castable of use silicon carbide-containing |
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2013
- 2013-09-30 CN CN201310460772.9A patent/CN103553646B/en active Active
Non-Patent Citations (2)
| Title |
|---|
| 朱秀英等: "铝铬质浇注料的研制和使用", 《耐火材料》 * |
| 韩茂鲲等: "添加SiC对高温下铝铬体系中铬价态的影响", 《耐火材料》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106735149A (en) * | 2016-12-06 | 2017-05-31 | 武汉威林科技股份有限公司 | A kind of construction method of the integrated poured tundish permanent layer of the high alumina castable of use silicon carbide-containing |
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Address after: 063009 Hebei province Tangshan City Xinhua West Road No. 46 Patentee after: North China Polytechnics Address before: 063009 Hebei province Tangshan City Xinhua West Road No. 46 Patentee before: Hebei United University |
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Effective date of registration: 20180408 Address after: 064000 Hebei province Tangshan City Fengrun silver Pu Zhen Yin Guan Tun Cun East Patentee after: Hebei Tianzhu iron and Steel Group Co., Ltd. Address before: 063009 Hebei province Tangshan City Xinhua West Road No. 46 Patentee before: North China Polytechnics |