CN102674856B - Method for preparing tundish fireproof spray paint by using steel slag tailings - Google Patents
Method for preparing tundish fireproof spray paint by using steel slag tailings Download PDFInfo
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Abstract
The invention relates to a method for preparing tundish fireproof spray paint by using steel slag tailings and belongs to the technical field of solid waste comprehensive utilization. Raw materials comprise the following ingredients in parts by weight: 35 to 40 parts of steel slag tailings, 60 to 65 parts of electric fused magnesite, 5 to 10 parts of bonding agents and 0 to 6 parts of admixtures, wherein the steel slag tailings and the electric fused magnesite are compounded according to the weight proportion and the particle grade to be prepared into loose materials. During use, the bonding agents, the admixtures and a proper amount of water are matched, and the materials are stirred and uniformly mixed to be used. The method has the advantages that the process is simple, the solid waste consumption is high, the normal-temperature pressure-resistance intensity of prepared 20*20*20mm sample blocks can reach 18 to 25 MPa, the requirement that the normal-temperature pressure-resistance intensity in the alkaline paint standard (YB/t4121-2004) for tundish in the metallurgy industry needs to be higher than 5MPa is reached, in addition, good dephosphorization and desulfuration effects are shown, and the effect of molten steel purification is reached.
Description
Technical field
The present invention relates to a kind of method of utilizing steel slag tailings to prepare tundish fire-proof spray coating, belong to solid waste comprehensive utilization technique field.
Background technology
Slag is the waste residue producing in steelmaking process, is generally 15% ~ 20% of crude steel output, and steel slag tailings is slag tailings after reclaiming the remaining choosings of valuable material such as iron.Fast development along with China's Iron And Steel Industry, the accumulating amount increase year after year of steel slag tailings, within 2011, Chinese crude steel output reaches 6.955 hundred million tons, slag reaches 1.043 hundred million tons, but utilization ratio only has 20%, the steel slag tailings of hoarding in a large number has not only taken a large amount of soils, also ecological environment security has around been caused to threat, therefore urgently opens up the recycling approach of the solid waste such as steel slag tailings.
The mineral composition of steel slag tailings is mainly tricalcium silicate, Dicalcium Phosphate (Feed Grade), calcium ferrite, ferric oxide, free calcium oxide and RO and equates, wherein silicate minerals is gelation activity mineral, therefore domestic current steel slag tailings is as gathering materials for backfill, mortar, roadbed material, oil mat, and utilizing mode is a kind of low value-added pattern.In addition, slag generates temperature and is about 1560 ℃, belongs to burning product, so the effect at high temperature of the physico-chemical property of steel slag tailings and refractory materials has very strong agreeing with property, there is certain refractoriness, therefore also there is the prospect developing and utilizing as raw material for refractory.But because steel slag tailings crystal is thick, chemical component fluctuation is large, and hardness is large, grindability is poor, and free CaO and MgO content are high, easily aquation, cause the stability of molded article prepared by steel slag tailings poor, these shortcomings of steel slag tailings have limited its application to a great extent.
Tundish is a refractory materials container of using in short flow process steel-making, first accept to water from ladle the molten steel that gets off, and then be assigned in each crystallizer and go by middle water containing opening, tundish is last metallurgical tank contacting with refractory materials before molten steel is become a useful person, and the performance of its inner lining fireproof material is the important step that restriction Clean Steel is smelted.In tundish, applying now more is magnesia calcium coating, the high-temperature stability that performance magnesium lime refractory is good and the performance of anti-high basicity slag.
The patent No. is " making method of steel slag refractory material " that CN 1088193A proposes, it is the reducing slag that utilizes iron and steel enterprise's blast furnace ironmaking process to produce, and do not relate to oxidation sludge remaining tailings after reclaiming the valuable materials such as iron that steelmaking process produces, and the utilization ratio of reducing slag is only 12% in this patented technology, the Technologies of Steel Slag Treatment of therefore developing high utilization rate becomes the key of development iron and steel enterprise solid waste recycling economy.Therefore how steel slag tailings iron and steel enterprise being produced is recycled, is developed refractory materials and is applied to iron and steel enterprise again, and realization is gathered materials on the spot, both economical, the technology that You Nengwei steel mill alleviates environmental stress very in the urgent need to.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing steel slag tailings to prepare tundish fire-proof spray coating; can directly utilize steel slag tailings particle as fine aggregate; reduce the energy consumption of grinding process; reduce the impact of ferriferous oxide on performances such as spray material refractoriness and intensity; promote the whole utilization of solid waste; the creation of value, protection of the environment.
The present invention realizes by following steps:
Raw material configuration of the present invention is meter by weight: 35 ~ 40 parts of steel slag tailings, 60 ~ 65 parts of electrosmelted magnesite clinkers, 5 ~ 10 parts of bonding agents, 0 ~ 6 part of admixture.Steel slag tailings and electrosmelted magnesite clinker are mixed and make bulk cargo according to part by weight and grain composition, coordinate bonding agent, admixture and water during use, amount of water is 5.5 ~ 7.5% of steel slag tailings and magnesia gross weight, is uniformly mixed, and can use.
Described steel slag tailings is the tailings after bessemer furnace slag magnetic separation, and its chemical constitution by mass percentage, mainly comprises CaO 45 ~ 55 %, SiO
212 ~ 18 %, TFe≤15%.The chemical constitution of electrosmelted magnesite clinker by mass percentage, mainly comprises MgO>=95.0%, CaO≤1.5%, SiO
2≤ 1.5%, Fe
2o
3≤ 0.8%.
In the present invention, adopting granularity is the steel slag tailings of 0.088 ~ 0.45mm, as the fine aggregate of fire-proof spray coating; Electrosmelted magnesite clinker is to be respectively the particle of 1 ~ 3mm, 0.45 ~ 1mm and <0.088mm and fine powder mixes by weight 1:1:2 by granularity, as coarse aggregate and the powder of fire-proof spray coating.
Bonding agent used is water glass; Admixture used comprises composite water-reducing agent, 200 ~ 400 order SiO
2micro mist, composite water-reducing agent and SiO
2the weight ratio of micro mist is 0 ~ 1: 5, and wherein, composite water-reducing agent is mixed and forms by weight 0.25 ~ 1: 1 by tripoly phosphate sodium STPP and Sodium hexametaphosphate 99.
Feature of the present invention is that the consumption of (1) steel slag tailings is large, and the comprehensive utilization of solid waste and consumption are had to important value; (2) directly utilize steel slag tailings particle as fine aggregate, do not need additionally to add the fine grinding process of slag, overcome the high energy consumption of the grinding process bringing due to features such as steel slag tailings grindability are poor, hardness is large; (3) feature that in steel slag tailings different grain size particle, ferriferous oxide content there are differences is found in research, has the steel slag tailings of certain particle size, thereby avoid the impact of ferriferous oxide high-content on performances such as spray material refractoriness and intensity by choice for use.(4) fire-proof spray coating that the present invention makes is alkaline spray material, the cold crushing strength of 20 * 20 * 20mm sample piece can reach 18-25MPa, reach the requirement of cold crushing strength >5MPa in alkaline coating standard for metallurgy industry tundish (YB/T 4121-2004), and free CaO can be used for dephosphorization, desulfurization, the effect that reaches purify hot metal and improve wear resistance.The calcareous fire-proof spray coating of alternative magnesium is used in the enterprising enforcement of tundish.(5) steel slag tailings that derives from iron and steel enterprise reclaims the whole unburned fire-proof spray coating of preparation that utilizes again, is applied to again iron and steel enterprise, gathers materials on the spot, economical.
Embodiment
The present invention is described below performance test:
According to the testing method of mould material, raw material is mixed, after adding again bonding agent, admixture to add suitable quantity of water to stir, insert mould (20 * 20 * 20mm) vibratory compaction 60s, the demoulding after normal temperature maintenance moulding 24h, then respectively through 110 ℃ of dry 24h, in High Temperature Furnaces Heating Apparatus, be heated to respectively 1000 ℃ and 1300 ℃ of insulation 3h, compressive strength after density, line velocity of variation, cold crushing strength and the burning of sample is respectively organized in test.
Below in conjunction with embodiment, specific embodiment of the invention is described further.
The main chemical constitution of the steel slag tailings relating in example 1 ~ 3 and electrosmelted magnesite clinker as shown in Table 1 and Table 2.Embodiment fire-proof spray coating the performance test results is in Table 3.
The main chemical constitution of steelworks slag that table 1 embodiment relates to
The main chemical constitution of electrosmelted magnesite clinker that table 2 embodiment relates to
Embodiment 1
The steel slag tailings of imperial steel (main chemical constitution is as shown in table 1) is sieved, and selecting granularity is the steel slag tailings of 0.088 ~ 0.45mm, electrosmelted magnesite clinker
(main chemical constitution is as shown in table 2) carries out size sorting, and bonding agent is water glass, chooses raw material and other composition weight umbers as follows:
35 parts of steel slag tailings: 0.088 ~ 0.45mm
Electrosmelted magnesite clinker
: 64 parts
Wherein 1 ~ 3mm is 16 parts
16 parts of 0.45 ~ 1mm
32 parts of <0.088mm
Bonding agent: 7 parts of water glass
Admixture: 0 part
Steel slag tailings and electrosmelted magnesite clinker are mixed and make bulk cargo according to above part by weight and grain composition, coordinate bonding agent, admixture and water during use, amount of water is 6.0% of steel slag tailings and magnesia gross weight, is uniformly mixed.The performance test results is shown in Table 3.
Embodiment 2
The steel slag tailings (main chemical constitution is as shown in table 1) that moves steel is sieved, and selecting granularity is the steel slag tailings of 0.088 ~ 0.45mm, electrosmelted magnesite clinker
(main chemical constitution is as shown in table 2) also carries out size sorting, and bonding agent is water glass, and admixture is 200 order SiO
2micro mist, choose raw material and other composition weight umbers as follows:
40 parts of steel slag tailings: 0.088 ~ 0.45mm
Crystallization magnesia
: 60 parts
Wherein 1 ~ 3mm is 15 parts;
15 parts of 0.45 ~ 1mm;
30 parts of <0.088mm
Bonding agent: 10 parts of water glass
Admixture: 200 order SiO
26 parts of micro mists
Steel slag tailings and electrosmelted magnesite clinker are mixed and make bulk cargo according to part by weight and grain composition, coordinate bonding agent, admixture and water during use, amount of water is 7.0% of steel slag tailings and magnesia gross weight, is uniformly mixed.The performance test results is shown in Table 3.
Embodiment 3
The steel slag tailings of imperial steel (main chemical constitution is as shown in table 1) is sieved, and selecting granularity is the steel slag tailings of 0.088 ~ 0.45mm, electrosmelted magnesite clinker
(main chemical constitution is as shown in table 2) also carries out size sorting, and bonding agent is water glass, and admixture is composite water-reducing agent and 350 order SiO
2micro mist, weight ratio 1:3, wherein composite water-reducing agent is mixed and forms by weight 0.64:1 by tripoly phosphate sodium STPP and Sodium hexametaphosphate 99, chooses raw material and other composition weight umbers as follows:
38 parts of steel slag tailings: 0.088 ~ 0.45mm
Electrosmelted magnesite clinker
: 65 parts
Wherein 1 ~ 3mm is 16.25 parts;
16.25 parts of 0.45 ~ 1mm;
32.5 parts of <0.088mm
Bonding agent: 5 parts of water glass
Admixture: 4 parts
350 order SiO wherein
23 parts of micro mists
1 part of composite water-reducing agent (tripoly phosphate sodium STPP and Sodium hexametaphosphate 99 weight ratio 0.64:1)
Steel slag tailings and electrosmelted magnesite clinker are mixed and make bulk cargo according to part by weight and grain composition, coordinate bonding agent, admixture and water during use, amount of water is 5.5% of steel slag tailings and magnesia gross weight, is uniformly mixed.The performance test results is shown in Table 3.
Example 4
The steel slag tailings (main chemical constitution is as shown in table 1) that moves steel is sieved, and selecting granularity is the steel slag tailings of 0.088 ~ 0.45mm, electrosmelted magnesite clinker
(main chemical constitution is as shown in table 2) also carries out size sorting, and bonding agent is water glass, and admixture is composite water-reducing agent and 350 order SiO
2micro mist, weight ratio 1:5, wherein composite water-reducing agent is mixed and forms by weight 0.38:1 by tripoly phosphate sodium STPP and Sodium hexametaphosphate 99, chooses raw material and other composition weight umbers as follows:
40 parts of steel slag tailings: 0.088 ~ 0.45mm
Electrosmelted magnesite clinker
: 60 parts
Wherein 1 ~ 3mm is 15 parts;
15 parts of 0.45 ~ 1mm;
30 parts of <0.088mm
Bonding agent: 7 parts of water glass
Admixture: 6 parts
350 order SiO wherein
25 parts of micro mists
1 part of composite water-reducing agent (tripoly phosphate sodium STPP and Sodium hexametaphosphate 99 weight ratio 0.38:1)
Steel slag tailings and electrosmelted magnesite clinker are mixed and make bulk cargo according to part by weight and grain composition, coordinate bonding agent, admixture and water during use, amount of water is 6% of steel slag tailings and magnesia gross weight, is uniformly mixed.The performance test results is shown in Table 3.
Table 3 embodiment fire-proof spray coating the performance test results
Claims (2)
1. a method of utilizing steel slag tailings to prepare tundish fire-proof spray coating, it is characterized in that: adopting steel slag tailings and electrosmelted magnesite clinker is main raw material, add a certain amount of bonding agent, admixture, raw material configures according to following parts by weight: 35 ~ 40 parts of steel slag tailings, 60 ~ 65 parts of electrosmelted magnesite clinkers, 5 ~ 10 parts of bonding agents, 0 ~ 6 part of admixture; First steel slag tailings and electrosmelted magnesite clinker are mixed and make bulk cargo according to part by weight and grain composition, coordinate bonding agent, admixture and water during use, amount of water is 5.5 ~ 7.5% of steel slag tailings and electrosmelted magnesite clinker gross weight, is uniformly mixed; Wherein, described steel slag tailings is the tailings after bessemer furnace slag magnetic separation, and its chemical constitution by mass percentage, mainly comprises CaO 45 ~ 55 %, SiO
212 ~ 18 %, TFe≤15%; The chemical constitution of electrosmelted magnesite clinker by mass percentage, mainly comprises MgO>=95.0%, CaO≤1.5%, SiO
2≤ 1.5%, Fe
2o
3≤ 0.8%; It is 0.088 ~ 0.45mm that described steel slag tailings adopts granularity, as the fine aggregate of fire-proof spray coating; Electrosmelted magnesite clinker is to be respectively the particle of 1 ~ 3mm, 0.45 ~ 1mm and <0.088mm fine powder by weight for 1:1:2 mixes, as coarse aggregate and the powder of fire-proof spray coating by granularity.
2. the method for utilizing steel slag tailings to prepare tundish fire-proof spray coating according to claim 1, is characterized in that: bonding agent used is water glass; Admixture used comprises composite water-reducing agent, 200 ~ 400 order SiO
2micro mist, composite water-reducing agent and SiO
2the weight ratio of micro mist is 0 ~ 1: 5, and wherein composite water-reducing agent is mixed and forms by weight 0.25 ~ 1: 1 by tripoly phosphate sodium STPP and Sodium hexametaphosphate 99.
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| CN103170614B (en) * | 2013-03-04 | 2015-04-15 | 新疆八一钢铁股份有限公司 | Process for using steel making waste slag as molten iron desulphurization slag-off plate coating materials |
| CN108164271A (en) * | 2017-12-19 | 2018-06-15 | 常州市鼎日环保科技有限公司 | A kind of preparation method of kiln flame-proof pouring material special |
| CN109680157A (en) * | 2018-12-10 | 2019-04-26 | 敬业钢铁有限公司 | A kind of steel slag recycling technique |
| CN109704793A (en) * | 2019-02-25 | 2019-05-03 | 包头稀土研究院 | The application method of vacuum induction melting production hydrogen bearing alloy coating |
| CN110357646A (en) * | 2019-07-27 | 2019-10-22 | 山东莱钢永锋钢铁有限公司 | A kind of steel slag tailings replacing river sand technique |
| CN114195483B (en) * | 2021-12-03 | 2023-05-16 | 徐州宏阳新材料科技股份有限公司 | Repairing mass for submerged arc furnace and construction method thereof |
| CN116445019A (en) * | 2023-04-25 | 2023-07-18 | 包钢集团冶金渣综合利用开发有限责任公司 | Steel slag composite spray coating, preparation method thereof and slag tank spraying method |
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| CN1475461A (en) * | 2002-08-12 | 2004-02-18 | 赵文厚 | Magnesium aluminium vanadium refractor materiel and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1475461A (en) * | 2002-08-12 | 2004-02-18 | 赵文厚 | Magnesium aluminium vanadium refractor materiel and its production method |
Non-Patent Citations (2)
| Title |
|---|
| 张永.某转炉尾渣选矿试验研究.《金属矿山》.2008,(第11期), |
| 某转炉尾渣选矿试验研究;张永;《金属矿山》;20081130(第11期);344 * |
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Effective date of registration: 20201223 Address after: 064400 5th floor, block a, 866 Gangcheng street, Qian'an City, Tangshan City, Hebei Province Patentee after: Beijing Tianjin Hebei Steel Union Qian'an Environmental Technology Co.,Ltd. Address before: 100083 No. 30, Haidian District, Beijing, Xueyuan Road Patentee before: University OF SCIENCE AND TECHNOLOGY BEIJING |
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Effective date of registration: 20210723 Address after: 064400 Mu Chang Kou Zhen song Ting Cun, Qian'an City, Tangshan City, Hebei Province Patentee after: Qian'an Jinyu Shougang Environmental Protection Technology Co.,Ltd. Address before: 064400 5th floor, block a, 866 Gangcheng street, Qian'an City, Tangshan City, Hebei Province Patentee before: Beijing Tianjin Hebei Steel Union Qian'an Environmental Technology Co.,Ltd. |