CN102233411B - Low-alkalinity crystallizer covering slag prepared from building waste clay - Google Patents
Low-alkalinity crystallizer covering slag prepared from building waste clay Download PDFInfo
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- CN102233411B CN102233411B CN 201110175155 CN201110175155A CN102233411B CN 102233411 B CN102233411 B CN 102233411B CN 201110175155 CN201110175155 CN 201110175155 CN 201110175155 A CN201110175155 A CN 201110175155A CN 102233411 B CN102233411 B CN 102233411B
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Abstract
The invention discloses low-alkalinity crystallizer covering slag prepared from building waste clay. The low-alkalinity crystallizer covering slag comprises the following raw material components in percentage by mass: 30 to 55 percent of clay, 8 to 15 percent of fluorite, 15 to 30 percent of lime stone, 8 to 15 percent of sodium carbonate, 1 to 3 percent of magnesium oxide, 2 to 4 percent of carbon black, 5 to 15 percent of graphite and 1 to 3 percent of binder. The covering slag prepared from the clay serving as a main material can maintain the complete granules of the hollow covering slag, has good heat-preserving effect in the using process and is melted uniformly without caking so as to guarantee to introduce molten slag uniformly and smoothly, effectively control the heat transfer of a crystallizer, avoid the caking of the crystallizer and a blank shell and improve the external quality of cast blanks.
Description
Technical field
The invention belongs to steel-making and use the auxiliary material technical field, particularly a kind of is the low basicity crystallizer protecting residue of raw material with the construction waste clay.
Technical background
That covering slag plays in casting process is lubricated, be incubated, prevent secondary oxidation of steel, the field trash of absorption come-up and regulate the effects such as hot-fluid that pass toward crystallizer.It is according to CaO-SiO that covering slag is formed
2-Al
2O
3Pseudo-wollastonite zone in the ternary system selects each to become to be grouped into, and CaO is as main basic matterial, SiO in the component that constitutes covering slag
2As main acid material, Na
2O, CaF
2, MgO is as main flux, carbonaceous components is as framework material and molten speed control preparation.Organic assembling by base-material and flux; adjust the chemical analysis of covering slag; be mingled with physical and chemical indexs such as ability, heat-transfer capability with fusion temperature, viscosity, crystal property, the absorption of regulating covering slag; satisfy the needs that under high pulling rate state, can keep normal slag consumption and liquid slag layer thickness and reasonable heat output; thereby guaranteed even generation and the lubricated crystallizer inwall of base shell, realized not having the production of bonding continuous casting.
Existing covering slag production technology is primary raw material with wollastonite, alum clay, and fluorite, sodium carbonate, magnesia, white alkali are the material of fluxing, wollastonite wherein, and alum clay occupies bigger proportioning in covering slag, and use amount is bigger.Because wollastonite, alum clay are subjected to the influence in the place of production, its cost of transportation is higher, will pass through processing such as fragmentation, grinding in the process of manufacture, has increased production cost again, and this has restricted the development of covering slag.Find after deliberation, clay is a kind of raw mineral materials that contains silicate and a certain amount of aluminium oxide, generate by containing the effect of feldspar rock through long-term weathering and geology in the earth's crust, clay pit is distributed widely in all over the world the rock and soil, of a great variety, reserve is enriched, and is a kind of natural resources of preciousness.In addition, it is the covering slag of primary raw material by wollastonite, alum clay, occurs phenomenon broken in the transportation easily, and it is complete to influence its covering slag uniform particles.And along with city and industrialized great development produce a large amount of clay construction wastes, need inject capital into and handle.
Summary of the invention
At the high characteristics of existing covering slag production cost, another object of the present invention provide a kind of cheap, uniform particles, intensity height, not breakable in the production and transport process be the low basicity crystallizer protecting residue of raw material with the construction waste clay.
A kind of is the low basicity crystallizer protecting residue of raw material with the construction waste clay, and the quality percentage composition of its material component is: clay 30～55%, fluorite 8～15%; lime stone 15～30%, sodium carbonate 8～15%, magnesia 1～3%; carbon black 2～4%, graphite 5～15%, binding agent 1～3%.
A kind of is the low basicity crystallizer protecting residue of raw material with the construction waste clay, and the quality percentage composition of main chemical is as follows: the main chemical compositions CaO 23～33% of low basicity covering slag, SiO
228～35%, MgO 1～3%, Al
2O
34～8%, Na
2O 4～10%, F
-5～9%, Fe
2O
30.5～3%, solid carbon C 10～25%.
Ratio (the SiO of described silica and aluminium oxide quality percentage mark
2/ Al
2O
3) scope is 3.5～5.3;
Of the present invention with the clay baking temperature of the low basicity crystallizer protecting residue covering slag of raw material manufacturing as an alternative, the chemical formula of clay is Al
2O
3(SiO
2)
mNH
2O, contain the crystallization water, in clay interior microscopic stratum granulosum and the layer absorption more water is arranged also simultaneously, these moisture are favourable producing in earlier stage, it is more even that various raw materials are mixed, and the granule strength height is difficult for fragmentation and uniform particles behind mist projection granulating.Covering slag is after 580～660 ℃ of high temperature dryings; clay is the residual fraction crystallization water still; the existence of the crystallization water has adverse influence to the use of covering slag; therefore; the present invention is different with existing technology in the mist projection granulating stage; the tower body temperature increases, 680～760 ℃ of intake air temperatures, 200～260 ℃ of air outlet temperature.
Because the present invention replaces wollastonite, alum clay with the construction waste clay, clay generally is fine dispersion particle, and processing is handled simple, uses clay to reduce production costs by first mate's degree as the raw materials for production of covering slag; Clay has associativity and plasticity simultaneously, has certain intensity after the high temperature drying, this feasible complete difficult fragmentation of covering slag uniform particles of producing.The chemical composition degree SiO of clay
240～80%, Al
2O
3Clay pit in 10～30% scopes such as kaolin, bentonite, carclazyte etc., both ratios in the covering slag that the silica that it is contained and the mass percent of aluminium oxide and existing traditional handicraft are produced approach, therefore, this type of clay is more suitable as the raw material of producing covering slag, can reduce the use of wollastonite and alum clay, save cost; A large amount of discarded clays are arranged in the present urban construction, with the production raw material of clay as a kind of low basicity covering slag, have environmental protection to utilize waste material and vast market competitiveness prospect.The covering slag that uses clay to make as main material wherein is easy to keep the particle integrity of hollow covering slag; heat insulation effect is preferably in use arranged; evenly not conglomeration of fusing; thereby it is even, smooth and easy to guarantee that liquid slag imports; the effectively heat transfer of crystallization control device; avoid crystallizer and base shell bonding, improve the external mass of strand.After using the raw material of clay as covering slag production, can substitute the use amount that alum clay and first mate's degree reduce wollastonite fully, so just reduce production cost from raw material.Use this covering slag at certain 150 * 150mm of steel mill
2The conticaster top-pour common medium-carbon steel of section, casting rate 2.3m/min proves through field trial; this covering slag in use covering slag spreadability is good, melting, and heat-insulating property is good; the slag consumption is the 0.33Kg/T steel, liquid slag layer thickness 8～12mm, and cc billet surface quality is intact.
The manufacture method of continuous crystallizer protecting slag of the present invention comprises the following steps:
1. the processing of clay: with mild-clay; add suitable quantity of water; stirring to pulp; cross filtering bulk and bulky grain thing by 100 order mesh screens; the slurries natural subsidence; air dry gets block after removing upper water, gets powdered clay after the pulverizing, determines SiO according to YB/T-190 " continuous casting covering slag chemical analysis method "
2, Al
2O
3Content with standby.
2. according to the concrete proportioning of required covering slag; clay, fluorite, lime stone, white alkali, magnesia, carbon black, graphite, binding agent are prepared burden by 600Kg; going into ball mill adds an amount of water and fully mixes; water mill slurrying; water mill time 〉=50min, mist projection granulating in the hydraulic pump input spray drying tower, pump pressure 1.2～1.6MPa; 680～760 ℃ of tower body intake air temperatures, 200～260 ℃ of air outlet temperature.
3. an above-mentioned gained pre-melted type hollow covering slag material is advanced screening, the particle of the back granularity 0.20～1.0mm that sieves more than 95%, moisture content≤0.3% is as certified products.
The specific embodiment
Embodiment 1:
Be the low basicity crystallizer protecting residue of raw material with the construction waste clay, the quality percentage composition of its material component is: clay 35%, fluorite 13%, lime stone 24%, sodium carbonate 8%, magnesia 3%, carbon black 2%, graphite 14%, binding agent 1%.Covering slag chemical composition: CaO 28.9%, SiO
233.6%, Na
2O 4.82%, F
-8.68%, MgO 2.8%, Al
2O
34.12%, Fe
2O
30.93%, solid carbon C 15.5%.Covering slag physical property: basicity (CaO/SiO
2) 0.86,1060 ℃ of fusing points, viscosity (1300 ℃) 0.39PaS, burn-off rate 36 seconds, moisture content≤0.3%.
Embodiment 2:
Be the low basicity crystallizer protecting residue of raw material with the construction waste clay, the quality percentage composition of its material component is: clay 48%, fluorite 9%, lime stone 17%, sodium carbonate 11%, magnesia 1%, carbon black 3%, graphite 10%, binding agent 1%.Covering slag chemical composition: CaO 25.9%, SiO
230.6%, Na
2O 5.8%, F
-8.2%, MgO 2.5%, Al
2O
34.62%, Fe
2O
30.93%, solid carbon C 17.8%.Covering slag physical property: basicity (CaO/SiO
2) 0.85,1030 ℃ of fusing points, viscosity (1300 ℃) 0.48PaS, burn-off rate 42 seconds, moisture content≤0.3%.
Embodiment 3:
Be the low basicity crystallizer protecting residue of raw material with the construction waste clay, the quality percentage composition of its material component is: clay 40%, fluorite 11%, lime stone 20%, sodium carbonate 11%, magnesia 2%, carbon black 4%, graphite 10%, binding agent 2%.A kind of is the low basicity crystallizer protecting residue of raw material with the construction waste clay, and the quality percentage composition of main chemical is as follows: the main chemical compositions CaO 27% of low basicity covering slag, SiO
228%, MgO 2%, Al
2O
35%, Na
2O 8%, F
-7%, Fe
2O
32%, solid carbon C 12%.Covering slag physical property: basicity (CaO/SiO
2) 0.96,1030 ℃ of fusing points, viscosity (1300 ℃) 0.48PaS, burn-off rate 42 seconds, moisture content≤0.3%.
Claims (1)
1. one kind is the low basicity crystallizer protecting residue of raw material with the construction waste clay; it is characterized in that; the quality percentage composition of its material component is: clay 30～55%; fluorite 8～15%, lime stone 15～30%, sodium carbonate 8～15%; magnesia 1～3%; carbon black 2～4%, graphite 5～15%, binding agent 1～3%.
2. low basicity crystallizer protecting residue as claimed in claim 1 is characterized in that, the quality percentage composition of main chemical is as follows: CaO 23～33%, SiO
228～35%, MgO 1～3%, Al
2O
34～8%, Na
2O 4～10%, F
-5～9%, Fe
2O
30.5～3%, solid carbon C 10～25%.
3. the manufacture method of a low basicity crystallizer protecting residue as claimed in claim 1 comprises the following steps:
A. the processing of clay: with mild-clay; add suitable quantity of water; stirring to pulp; cross filtering bulk and bulky grain thing by 100 order mesh screens; the slurries natural subsidence; air dry gets block after removing upper water, gets powdered clay after the pulverizing, determines SiO according to YB/T-190 " continuous casting covering slag chemical analysis method "
2, Al
2O
3Content with standby;
B. according to the concrete proportioning of required covering slag, clay, fluorite, lime stone, white alkali, magnesia, carbon black, graphite, binding agent are prepared burden by 600Kg, going into ball mill adds an amount of water and fully mixes, water mill slurrying, water mill time 〉=50min, mist projection granulating in the hydraulic pump input spray drying tower, pump pressure 1.2～1.6MPa, 680～760 ℃ of tower body intake air temperatures, 200～260 ℃ of air outlet temperature obtain a pre-melted type hollow covering slag material;
C. an above-mentioned gained pre-melted type hollow covering slag material is screened, the particle of the back granularity 0.20～1.0mm that sieves more than 95%, moisture content≤0.3% is as certified products.
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|---|---|---|---|
| CN 201110175155 CN102233411B (en) | 2011-06-27 | 2011-06-27 | Low-alkalinity crystallizer covering slag prepared from building waste clay |
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|---|---|---|---|
| CN 201110175155 CN102233411B (en) | 2011-06-27 | 2011-06-27 | Low-alkalinity crystallizer covering slag prepared from building waste clay |
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| CN102233411A CN102233411A (en) | 2011-11-09 |
| CN102233411B true CN102233411B (en) | 2013-08-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103785806B (en) * | 2013-10-19 | 2016-03-23 | 河南通宇冶材集团有限公司 | A kind of slab continuous casting crystallizer protection slag and production method thereof |
| CN103785804B (en) * | 2013-10-19 | 2016-05-11 | 河南通宇冶材集团有限公司 | A kind of protecting slag of round blank continuous-casting crystallizer and production method thereof |
| CN103785805B (en) * | 2013-10-19 | 2016-05-11 | 河南通宇冶材集团有限公司 | A kind of square billet middle low carbon steel continuous crystallizer protecting slag and production method thereof |
| CN103624227B (en) * | 2013-11-04 | 2016-08-17 | 河南通宇冶材集团有限公司 | A kind of square billet middle low carbon steel continuous crystallizer protecting slag and preparation method thereof |
| CN108145107A (en) * | 2017-06-27 | 2018-06-12 | 贺州市创伟冶金耐材有限公司 | A kind of low viscosity crystallizer protecting residue |
| CN108145105A (en) * | 2017-06-27 | 2018-06-12 | 胡毅婧 | A kind of special kaolin of crystallizer protecting residue and its preparation method and application |
| CN111440923A (en) * | 2020-04-24 | 2020-07-24 | 芜湖新兴铸管有限责任公司 | Covering slag for high-carbon high-alloy wear-resistant steel and preparation method thereof |
| CN112620599B (en) * | 2020-12-29 | 2022-04-08 | 河南通宇冶材集团有限公司 | Ultralow-alkalinity high-vitrification protective slag for bloom medium-high carbon steel and preparation method thereof |
| CN114888249B (en) * | 2022-05-23 | 2024-05-10 | 首钢京唐钢铁联合有限责任公司 | Covering slag for producing medium carbon steel with high pulling speed of sheet billet and preparation method thereof |
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| DE4215169A1 (en) * | 1992-05-08 | 1993-11-11 | Veitscher Magnesitwerke Ag | Protective non-sintering cover for smelting process - consists of caustic magnesia plus additive in pelletised or granular form, giving good thermal isolation from and protection against oxidn. to the molten metal e.g. steel |
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| CN101758174A (en) * | 2009-12-30 | 2010-06-30 | 首钢总公司 | Mold powder capable of effectively controlling peritectic steel thick slab narrow face depression defect |
| CN101898232A (en) * | 2009-05-27 | 2010-12-01 | 宝山钢铁股份有限公司 | Mould powder for manganese-containing low content alloy peritectic steel subjected to continuous casting by thick slab caster |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0679422A (en) * | 1991-07-29 | 1994-03-22 | Kawasaki Steel Corp | Method for continuously measuring molten steel temperature in tundish |
-
2011
- 2011-06-27 CN CN 201110175155 patent/CN102233411B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4215169A1 (en) * | 1992-05-08 | 1993-11-11 | Veitscher Magnesitwerke Ag | Protective non-sintering cover for smelting process - consists of caustic magnesia plus additive in pelletised or granular form, giving good thermal isolation from and protection against oxidn. to the molten metal e.g. steel |
| CN1322597A (en) * | 2001-04-26 | 2001-11-21 | 刘长福 | Pre-molten protective particle sludge and its production process |
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| CN102233411A (en) | 2011-11-09 |
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