CN102674856A - 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 the slag tailings to prepare the tundish fire-proof spray coating, belong to solid waste comprehensive utilization technique field.
Background technology
Slag is the waste residue that produces in the steelmaking process, is generally 15% ~ 20% of crude steel output, and the slag tailings then is slag tailings after the remaining choosings of valuable material such as recovery iron.Fast development along with China's Iron And Steel Industry; The accumulating amount of slag tailings increases year by year, and Chinese crude steel output reached 6.955 hundred million tons in 2011, and slag reaches 1.043 hundred million tons; But utilization ratio has only 20%; The slag tailings of hoarding has in a large number not only taken a large amount of soils, also to around ecological environment security caused threat, therefore demand opening up recycling of solid wastes such as slag tailings urgently and utilize approach.
The mineral composition of slag tailings is mainly tricalcium silicate, Dicalcium Phosphate (Feed Grade), calcium ferrite, red stone, free calcium oxide and RO and equates; Wherein silicate minerals is the gelation activity mineral; Therefore domestic present slag tailings is used for backfill, mortar, roadbed material, oil mat as gathering materials, and utilizing mode is a kind of low value-added pattern.In addition; Slag generates temperature and is about 1560 ℃, belongs to the burning product, so the effect at high temperature of the physico-chemical property of slag tailings and refractory materials has very strong agreeing with property; Certain refractoriness is arranged, therefore also have the prospect that develops and utilizes as raw material for refractory.But because slag tailings crystal is thick, chemical component fluctuation is big, and hardness is big; Grindability is poor, and free CaO and MgO content are high, is prone to aquation; Cause the stability of molded article of slag tailings preparation poor, these shortcomings of slag tailings largely limit its application.
Tundish is a refractory materials container of using in the short flow process steel-making; At first accept to water the molten steel that gets off from ladle; And then be assigned in each mold by middle water containing opening and go; Tundish is last metallurgical tank that contacts 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 the restriction Clean Steel is smelted.Using more now in the tundish is the calcareous spray material of magnesium, the performance of performance magnesium lime refractory good high-temperature stability and anti-high basicity slag.
" making method of steel slag refractory material " that the patent No. proposes for CN 1088193A; 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 that steelmaking process produces remaining tailings after reclaiming valuable material such as iron; And the utilization ratio of reducing slag is merely 12% in this patented technology, and the slag treatment technology of therefore developing high utilization rate becomes the key of development iron and steel enterprise solid waste recycling economy.Therefore how the slag tailings that iron and steel enterprise is produced is recycled, developed refractory materials and is applied to iron and steel enterprise again, realizes gathering materials on the spot, and is both economical, can press for very much for the technology that steel mill alleviates environmental stress again.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing the slag tailings to prepare the tundish fire-proof spray coating; Can directly utilize slag tailings particle as fine aggregate; Reduce the energy consumption of grinding process, reduce ferriferous oxide, promote the whole utilization of solid waste Effect on Performance such as spray material refractoriness and intensity; The creation of value, the protection environment.
The present invention realizes through following steps:
Raw material configuration of the present invention is meter by weight: 35 ~ 40 parts of slag tailings, 60 ~ 65 parts of electrosmelted magnesite clinkers, 5 ~ 10 parts of wedding agents, 0 ~ 6 part of admixture.With slag tailings and electrosmelted magnesite clinker according to part by weight and grain composition mixed bulk cargo, cooperate wedding agent, admixture and water during use, amount of water is 5.5 ~ 7.5% of slag tailings and a magnesia gross weight, mixes, and can use.
Said slag tailings is the tailings after the bessemer furnace slag magnetic separation, and its chemical constitution mainly comprises CaO 45 ~ 55 %, SiO by mass percentage
212 ~ 18 %, TFe≤15%.The chemical constitution of electrosmelted magnesite clinker mainly comprises MgO>=95.0% by mass percentage, CaO≤1.5%, SiO
2≤1.5%, Fe
2O
3≤0.8%.
Adopting granularity among the present invention is the slag tailings of 0.088 ~ 0.45mm, as the fine aggregate of fire-proof spray coating; Electrosmelted magnesite clinker is to be respectively 1 ~ 3mm, 0.45 ~ 1mm and < particle and the fine powder of 0.088mm mix by weight 1:1:2, as the coarse aggregate and the powder of fire-proof spray coating by granularity.
Used wedding agent is a water glass; Used admixture 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, wherein, composite water-reducing agent by tripoly phosphate sodium STPP and Sodium hexametaphosphate 99 by weight 0.25 ~ 1: 1 mixes and forms.
Characteristics of the present invention are that the consumption of (1) slag tailings is big, and the comprehensive utilization and the consumption of solid waste is had important value; (2) directly utilize slag tailings particle as fine aggregate, do not need the fine grinding process of extra additional slag, overcome the high energy consumption of the grinding process that characteristics are brought because slag tailings grindability is poor, hardness is big etc.; (3) discover the characteristics that ferriferous oxide content there are differences in the slag tailings different grain size particle, have the slag tailings of certain particle size through selecting to use, thereby avoid the ferriferous oxide high-content Effect on Performance such as spray material refractoriness and intensity.(4) fire-proof spray coating that makes of the present invention is alkaline spray material; The cold crushing strength of 20 * 20 * 20mm appearance piece can reach 18-25MPa; Reach the metallurgy industry tundish with cold crushing strength in the alkaline coating standard (YB/T 4121-2004)>requirement of 5MPa; And free CaO can be used for dephosphorization, desulfurization, reaches purify hot metal and the effect that improves wear resistance.The calcareous fire-proof spray coating of alternative magnesium is used in the enterprising enforcement of tundish.(5) the 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 iron and steel enterprise again, gathers materials on the spot, and is economical.
Embodiment
The present invention narrates as follows performance test:
Testing method according to mould material; Raw materials mix is even, add wedding agent, admixture again and add after suitable quantity of water stirs, insert mould (20 * 20 * 20mm) vibratory compaction 60s; The demoulding behind the normal temperature maintenance moulding 24h; Then respectively through 110 ℃ of dry 24h, be heated to respectively in the High Temperature Furnaces Heating Apparatus 1000 ℃ with 1300 ℃ of insulation 3h, test compressive strength after density, line velocity of variation, cold crushing strength and the burning of respectively organizing sample.
Below in conjunction with embodiment practical implementation of the present invention is described further.
The slag tailings that relates in the instance 1 ~ 3 and the main chemical constitution of electrosmelted magnesite clinker are shown in table 1 and table 2.Embodiment fire-proof spray coating The performance test results is seen table 3.
The main chemical constitution of steelworks slag that table 1 embodiment relates to
The main chemical constitution of the electrosmelted magnesite clinker that table 2 embodiment relates to
Embodiment 1
The slag tailings (main chemical constitution is as shown in table 1) of imperial steel is sieved; Selecting granularity for use is the slag tailings of 0.088 ~ 0.45mm; Electrosmelted magnesite clinker
(main chemical constitution is as shown in table 2) carries out size sorting; Wedding agent is a water glass, and it is following with other composition weight umbers to choose raw material:
35 parts of slag tailings: 0.088 ~ 0.45mm
Electrosmelted magnesite clinker
: 64 parts
Wherein 1 ~ 3mm is 16 parts
0.45 16 parts of ~ 1mm
< 32 parts of 0.088mm
Wedding agent: 7 parts of water glass
Admixture: 0 part
With slag tailings and electrosmelted magnesite clinker according to above part by weight and grain composition mixed bulk cargo, cooperate wedding agent, admixture and water during use, amount of water is 6.0% of slag tailings and a magnesia gross weight, mixes.The performance test results is seen shown in the table 3.
Embodiment 2
The slag tailings that moves steel (main chemical constitution is as shown in table 1) is sieved, and selecting granularity for use is the 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 wedding agent is a water glass, and admixture is 200 order SiO
2Micro mist, it is following with other composition weight umbers to choose raw material:
40 parts of slag tailings: 0.088 ~ 0.45mm
Crystallization magnesia
: 60 parts
Wherein 1 ~ 3mm is 15 parts;
0.45 15 parts of ~ 1mm;
< 30 parts of 0.088mm
Wedding agent: 10 parts of water glass
Admixture: 200 order SiO
26 parts of micro mists
With slag tailings and electrosmelted magnesite clinker according to part by weight and grain composition mixed bulk cargo, cooperate wedding agent, admixture and water during use, amount of water is 7.0% of slag tailings and a magnesia gross weight, mixes.The performance test results is seen shown in the table 3.
Embodiment 3
The slag tailings (main chemical constitution is as shown in table 1) of imperial steel is sieved, and selecting granularity for use is the 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 wedding agent is a 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 made up of by weight the 0.64:1 mixing tripoly phosphate sodium STPP and Sodium hexametaphosphate 99, and it is following with other composition weight umbers to choose raw material:
38 parts of slag tailings: 0.088 ~ 0.45mm
Electrosmelted magnesite clinker
: 65 parts
Wherein 1 ~ 3mm is 16.25 parts;
0.45 16.25 parts of ~ 1mm;
< 32.5 parts of 0.088mm
Wedding 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)
With slag tailings and electrosmelted magnesite clinker according to part by weight and grain composition mixed bulk cargo, cooperate wedding agent, admixture and water during use, amount of water is 5.5% of slag tailings and a magnesia gross weight, mixes.The performance test results is seen shown in the table 3.
Instance 4
The slag tailings that moves steel (main chemical constitution is as shown in table 1) is sieved, and selecting granularity for use is the 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 wedding agent is a 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 made up of by weight the 0.38:1 mixing tripoly phosphate sodium STPP and Sodium hexametaphosphate 99, and it is following with other composition weight umbers to choose raw material:
40 parts of slag tailings: 0.088 ~ 0.45mm
Electrosmelted magnesite clinker
: 60 parts
Wherein 1 ~ 3mm is 15 parts;
0.45 15 parts of ~ 1mm;
< 30 parts of 0.088mm
Wedding 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)
With slag tailings and electrosmelted magnesite clinker according to part by weight and grain composition mixed bulk cargo, cooperate wedding agent, admixture and water during use, amount of water is 6% of slag tailings and a magnesia gross weight, mixes.The performance test results is seen shown in the table 3.
Table 3 embodiment fire-proof spray coating The performance test results
Claims (4)
1. method of utilizing the slag tailings to prepare the tundish fire-proof spray coating; It is characterized in that: adopting slag tailings and electrosmelted magnesite clinker is main raw material; Add a certain amount of wedding agent, admixture, raw material disposes according to following parts by weight: 35 ~ 40 parts of slag tailings, 60 ~ 65 parts in magnesia; 5 ~ 10 parts of wedding agents, 0 ~ 6 part of admixture; , earlier with slag tailings and electrosmelted magnesite clinker according to part by weight and grain composition are mixed must bulk cargo, cooperation wedding agent, admixture and water during use, amount of water is 5.5 ~ 7.5% of slag tailings and an electrosmelted magnesite clinker gross weight, mixes.
2. the method for utilizing the slag tailings to prepare the tundish fire-proof spray coating according to claim 1 is characterized in that: said slag tailings is the tailings after the bessemer furnace slag magnetic separation, and its chemical constitution mainly comprises CaO 45 ~ 55 %, SiO by mass percentage
212 ~ 18 %, TFe≤15%; The chemical constitution of electrosmelted magnesite clinker mainly comprises MgO>=95.0% by mass percentage, CaO≤1.5%, SiO
2≤1.5%, Fe
2O
3≤0.8%.
3. the method for utilizing the slag tailings to prepare the tundish fire-proof spray coating according to claim 1 and 2 is characterized in that: it is 0.088 ~ 0.45mm that the slag tailings adopts granularity, as the fine aggregate of fire-proof spray coating; Electrosmelted magnesite clinker is to be respectively 1 ~ 3mm, 0.45 ~ 1mm and < particle of 0.088mm and fine powder are by weight for 1:1:2 mixes, as the coarse aggregate and the powder of fire-proof spray coating by granularity.
4. the method for utilizing the slag tailings to prepare the tundish fire-proof spray coating according to claim 1 is characterized in that: used wedding agent is a water glass; Used admixture 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, wherein composite water-reducing agent by tripoly phosphate sodium STPP and Sodium hexametaphosphate 99 by weight 0.25 ~ 1: 1 mixes and forms.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170614A (en) * | 2013-03-04 | 2013-06-26 | 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 |
| CN114195483A (en) * | 2021-12-03 | 2022-03-18 | 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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Patent Citations (1)
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|---|---|---|---|---|
| CN1475461A (en) * | 2002-08-12 | 2004-02-18 | 赵文厚 | Magnesium aluminium vanadium refractor materiel and its production method |
Non-Patent Citations (1)
| Title |
|---|
| 张永: "某转炉尾渣选矿试验研究", 《金属矿山》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170614A (en) * | 2013-03-04 | 2013-06-26 | 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 |
| CN114195483A (en) * | 2021-12-03 | 2022-03-18 | 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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| CN102674856B (en) | 2014-03-26 |
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