CN103639380B - A kind of slab continuous crystallizer protecting slag and preparation method thereof - Google Patents
A kind of slab continuous crystallizer protecting slag and preparation method thereof Download PDFInfo
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- CN103639380B CN103639380B CN201310532730.1A CN201310532730A CN103639380B CN 103639380 B CN103639380 B CN 103639380B CN 201310532730 A CN201310532730 A CN 201310532730A CN 103639380 B CN103639380 B CN 103639380B
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- slag
- waste residue
- solder flux
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Abstract
The invention discloses a kind of slab continuous crystallizer protecting slag and preparation method thereof, described covering slag composition (unit: Wt%) comprising: SiO
228 ~ 30, CaO? 35 ~ 37, MgO? 3.3 ~ 4.8, Fe
2o
3?0.7 ~ 1.3, Al
2o
3?5 ~ 7, Na
2o? 9 ~ 11, F
8 ~ 10, C
gu3 ~ 5; Described method comprises pre-treatment of raw material and detection, covering slag formula Design, batching and slurrying, mist projection granulating, screening dedusting and Product checking; This method production technology is simple; dust is few; spreadability is good, changes slag uniform and stable, large to ambient contribution; after testing; adopt solder flux waste residue as raw material, compared with convenient source, covering slag cost reduces by 255 ~ 308 yuan/ton; for the production of rear, strand one-level qualification rate promotes 3.0 ~ 3.8% on year-on-year basis.
Description
Technical field
The invention belongs to metallurgic auxiliary materials technical field, be specifically related to a kind of slab continuous crystallizer protecting slag and preparation method thereof.
Background technology
China's iron and steel
industrythrough the develop rapidly of nearly more than ten years, crude steel output rises to 7.16 hundred million tons in 2012 from 2000 1.3 hundred million tons.But steel industry of today is faced with the bottleneck phase of development, and be production capacity chaotic expansive on the one hand, domestic iron and steel production capacity is obviously superfluous; But be on the other hand the significantly downslide of industrial profit rate, steel profit high-growth era has been difficult to reproduce, stepping into one longer adjustment period.Each iron and steel enterprise reduces all one after another and comprises the various raw materials of continuous crystallizer protecting slag, the procurement price of fuel; in addition the various prices of raw and semifnished materials of continuous crystallizer protecting slag are going up always, and therefore the existence of cost efficiency to enterprise of continuous crystallizer protecting slag enterprise is most important.Ge Jia continuous crystallizer protecting slag enterprise all making great efforts to seek high-quality, cheap raw material carry out the higher raw material of alternative existing price, reduce costs, and improve the market competitiveness, improve the ability to ward off risks of enterprise.
In the prior art, continuous crystallizer protecting slag is all with wollastonite, aluminium stone, lime stone is base-material, with fluorite, white alkali etc. are flux material, production is made again with addition of carbonaceous material, wherein wollastonite, aluminium stone, fluorite material occupies significant proportion in covering slag, use amount is large, a large amount of exploitation can destroy the ecological balance, cause environmental pollution, and these materials all belong to non-renewable resources, price costly, add fragmentation, the processing charges such as grinding, the production cost of continuous crystallizer protecting slag is remained high, constrain the research and development of continuous crystallizer protecting slag, therefore finding alternative materials with low cost just seems rather crucial.
Solder flux waste residue is the waste material after submerged arc bead welding, and its main component is: SiO
2, CaO, MgO, Fe
2o
3, Al
2o
3, Na
2o, F, Fe.Through using the metallurgical equipment manufacturer investigation of solder flux to periphery, produce Harmann Berstorff, Maschinenbau GmbH that 1W overlaps metallurgical equipment per year for one, the solder flux waste residue produced for 1 year just has about 1000 tons, and the main method processing solder flux waste residue is at present: to topple over, landfill, cause the wasting of resources, and containing Na in solder flux waste residue
2o, F stack in the open or after landfill through rainwater shower, permeate the ground, soil and groundwater can be caused to pollute.And silicon contained in solder flux waste residue, calcium, magnesium, aluminium, sodium, fluorine are elements necessary in continuous crystallizer protecting slag; by adding solder flux waste residue in continuous crystallizer protecting slag; can substitute or in Some substitute continuous crystallizer protecting slag formula containing one or more of this chemical element raw material; both reduce the production cost of continuous crystallizer protecting slag, achieve the process problem that economic benefit effectively solves again solder flux waste residue.
The uniformity of covering slag composition directly affects the stable of its physical property; in use for obtaining good melting behavior; require that its raw material physical property is as far as possible stable, therefore should be reduced to a point fluctuation as far as possible, raw material is selected to accomplish that composition rationally; stable components; the needs of continuous casting quality should be met, again economy, gather materials on the spot as far as possible; make full use of local waste resource, as some covering slag raw material domestic has glass dust (SiO
2be greater than 70%, Na
2o is greater than 13%), cement, blast furnace slag, flue dust etc.Number of patent application is the patent " a kind of method utilizing waste slag of electrolytic aluminium to produce continuous crystallizer protecting slag " of CN102430730A; in raw materials waste slag of electrolytic aluminium, main component is C, F, Al; waste slag of electrolytic aluminium is mainly used in replacing aluminium stone, fluorite, carbonaceous material; save cost, but contained SIO
2, Fe
2o
3instability, needs repeatedly to check mixing.In addition, when covering slag adopts some industrial wastes as base-material, the base-material kind of use should be lacked as far as possible, and to improve covering slag fusing uniformity, waste slag of electrolytic aluminium fails effectively to reduce the kind of base-material, easily occurs sub-melting phenomenon in covering slag fusion process.
Summary of the invention
The present invention is to make up above-mentioned deficiency; a kind of slab continuous crystallizer protecting slag and preparation method thereof is provided; the method production technology is simple; dust is few; spreadability is good, changes slag uniform and stable, improves the utilization rate of strand one-level qualification rate and solder flux waste residue; large to ambient contribution, significantly reduce the production cost of continuous crystallizer protecting slag.
A kind of slab continuous crystallizer protecting slag, its chemical composition and content (unit: Wt%) comprising: SiO
228 ~ 30, CaO35 ~ 37, MgO3.3 ~ 4.8, Fe
2o
30.7 ~ 1.3, Al
2o
35 ~ 7, Na
2o9 ~ 11, F8 ~ 10, C
gu3 ~ 5, fusing point 1090 ~ 1130 DEG C, viscosity 0.12 ~ 0.14PaS.
A preparation method for slab continuous crystallizer protecting slag, comprises the following steps:
1. pre-treatment of raw material and detection: stirred by solder flux waste residue forklift batch and mix, control its water content 0.3 ~ 0.8%, and be processed into 290 ~ 310 object micro mists, after discharging opening carries out deironing, detects chemical analysis to the sampling of solder flux waste residue;
2. covering slag formula Design: as required, utilizes solder flux waste residue and other all kinds of raw material, designs formula;
3. batching and slurrying: by solder flux waste residue formula, raw material is added in pulping tank the pulping that adds water;
4. mist projection granulating: by the slip that stirs by plunger displacement pump pressure atomization granulation;
5. sieve dedusting and Product checking: after being sieved with 20 ~ 60 object vibratory sieves by particle spray granulation covering slag, chemical analysis, physical index are detected to product sampling;
In described batching and slurrying, pulping time 62 ~ 70min, water content 27 ~ 30%;
Described mist projection granulating plunger pump is pressed in 2.2 ~ 2.5MPa, liquid supply speed at 20 ~ 23mL/min, fluid bed bed temperature 56 ~ 58 DEG C.
Raw material solder flux waste residue wide material sources of the present invention; low price; Ca, Si, Mg, Al, Na, F element contained in solder flux waste residue; the production cost of slab middle low carbon steel continuous crystallizer protecting slag can be reduced as raw material; and effectively solve the process problem of solder flux waste residue; reasonable employment for solder flux waste residue provides new method, effectively reduces bulk deposition and the severe contamination problem of solder flux waste residue, economic benefit and environmental benefit remarkable.In addition, in the solder flux waste residue of deironing and homogenizing, every composition is more stable, the technical requirement of material purchases error ± 1% in covering slag can be reached, in the process preparing slab continuous crystallizer protecting slag product, do not need inspection repeatedly, reduce inspection cost; Solder flux waste residue ore deposit is simple mutually, can form stable melt cinder film fast, avoid secondary oxidation of steel; Seldom, it is removed through slurrying and mist projection granulating, avoids and causes secondary pollution with steel contacts for carbonate, sulfide, nitride-based mineral, and inclusion content in melting steel mostly is acid silicates impurity, has stronger dross inclusion adsorption ability.
The present invention adopts mist projection granulating to carry out granulation with dry, utilize plunger displacement pump to pressurize and slip is delivered to spraying dry tower top, pump pressure is at 2.2 ~ 2.5MPa, make mist projection granulating liquid supply speed at 20 ~ 23mL/min, the full and uniform atomization of slip can be made under this speed, less and the regular shape of particle, covering slag forms hollow bead, can obtain lower bulk density; After the spray-dried evaporation moisture content of particle, the fine grained of basic forming falls into the fluid bed at the bottom of tower, and fluidized-bed temperature is located at 56 ~ 58 DEG C, can reduce the moisture of covering slag particle further.
The present invention adopts welding slag waste residue as raw material, to the process optimization that mist projection granulating carries out, effectively improve covering slag quality and mass output rate, improve the spreading rate of covering slag at molten steel surface, the melting structure of suitable thickness can be formed rapidly in casting process, both there is good heat preservation and insulation, there is again good absorb inclusion thing ability and prevent secondary oxidation of steel, without clustering phenomena, change slag uniform and stable, gained covering slag steady quality, both reduced production cost, and standard needed for enterprise can be met again; After testing, adopt solder flux waste residue as raw material, compared with convenient source, the cost of covering slag reduces 255 ~ 308 yuan/ton, and for the production of rear, strand one-level qualification rate improves 3.0 ~ 3.8% on year-on-year basis.
Detailed description of the invention
A kind of slab continuous crystallizer protecting slag, its chemical composition and content (unit: Wt%) comprising: SiO
228 ~ 30, CaO35 ~ 37, MgO3.3 ~ 4.8, Fe
2o
30.7 ~ 1.3, Al
2o
35 ~ 7, Na
2o9 ~ 11, F8 ~ 10, C
gu3 ~ 5, fusing point 1090 ~ 1130 DEG C, viscosity 0.12 ~ 0.14PaS.
The concrete production technology of this covering slag is as follows:
1. pre-treatment of raw material and detection: the solder flux waste residue collecting periphery metallurgical equipment manufacturer, mixing of being stirred by solder flux waste residue forklift batch, controls its water content 0.3 ~ 0.8%, and is processed as 290 ~ 310 object micro mists to it, carry out deironing at discharging opening; Chemical analysis is detected to the sampling of solder flux waste residue, records chemical analysis as shown in the table:
As seen from the above table, in the solder flux waste residue of deironing and homogenizing, every composition is more stable, the technical requirement of material purchases error ± 1% in covering slag can be reached, in the process preparing continuous crystallizer protecting slag product, do not need inspection repeatedly, reduce inspection cost; Solder flux waste residue ore deposit is simple mutually, can form stable melt cinder film fast, avoid secondary oxidation of steel; Seldom, it is removed through slurrying and mist projection granulating, avoids and causes secondary pollution with steel contacts for carbonate, sulfide, nitride-based mineral, and inclusion content in melting steel mostly is acid silicates impurity, has stronger dross inclusion adsorption ability;
2. covering slag formula Design: as required, utilizes solder flux waste residue and other all kinds of raw material, designs formula;
3. batching and slurrying: by solder flux waste residue formula, raw material is added in pulping tank the pulping that adds water, described pulping time 62 ~ 70min, water content 27 ~ 30%;
4. mist projection granulating: by the slip that stirs by plunger displacement pump pressure atomization granulation, described mist projection granulating plunger pump is pressed in 2.2 ~ 2.5MPa, liquid supply speed at 20 ~ 23mL/min, fluid bed bed temperature 56 ~ 58 DEG C;
5. sieve dedusting and Product checking: after being sieved with 20 ~ 60 object vibratory sieves by particle spray granulation covering slag, chemical analysis, physical index are detected to product sampling.
Embodiment one
In above-mentioned production technology, solder flux waste residue formula can be as shown in the table:
If use convenient source, fill a prescription as shown in the table:
From above Data Comparison, the solder flux waste residue of 27% replaces the wollastonite of 18%, ice crystal, the fluorite of 4%, calcite, the magnesium powder of 4%, the alum clay of 3% of 3% of 5% in conventional formulation, the soda ash of additional 5%, the quartz of 5%; The conventional formulation cost of raw material is 1253.5 yuan/ton, and solder flux waste residue is by 350 yuan/ton of calculating, and the cost of raw material of solder flux waste residue formula is 945.8 yuan, makes the cost of raw material reduce by 308.7 yuan/ton;
In technique 3. in described batching and slurrying, pulping time 62min, water content 27%; 4. described mist projection granulating plunger pump is pressed in 2.2MPa, liquid supply speed at 24mL/min, fluid bed bed temperature 56 DEG C; Detect chemical analysis, physical index to product sampling after screening dedusting, testing result is as follows:
Embodiment two
In above-mentioned production technology, solder flux waste residue formula can also be as shown in the table:
If use convenient source, fill a prescription as shown in the table:
From above Data Comparison, the solder flux waste residue of 18% replaces ice crystal, the wollastonite of 11%, calcite, 4% flint clay, 2% alum clay of 2% of in conventional formulation 3%, separately add 4% quartz, 2%NaF, the conventional formulation cost of raw material is 1129.5 yuan/ton, solder flux waste residue is by 350 yuan/ton of calculating, the cost of raw material of solder flux waste residue formula is 874.3 yuan, and the cost of raw material reduces by 255.2 yuan/ton.
In technique 3. in described batching and slurrying, pulping time 66min, water content 29%; 4. described mist projection granulating plunger pump is pressed in 2.4MPa, liquid supply speed at 24mL/min, fluid bed bed temperature 57 DEG C; Detect chemical analysis, physical index to product sampling after screening dedusting, testing result is as follows:
Embodiment three
In above-mentioned production technology, solder flux waste residue formula can also be as shown in the table:
If use convenient source, fill a prescription as shown in the table:
From above Data Comparison, the solder flux waste residue of 24% replaces wollastonite, the fluorite of 5%, calcium carbonate, the glass stone of 3%, the alum clay of 2% of 9% of in conventional formulation 12%, adds the calcite of 4% outward, the quartz of 3%; The conventional formulation cost of raw material is 1214.6 yuan/ton, and solder flux waste residue is by 350 yuan/ton of calculating, and the cost of raw material of solder flux waste residue formula is 948.4 yuan, makes the cost of raw material reduce by 286.2 yuan/ton.
In technique 3. in described batching and slurrying, pulping time 70min, water content 30%; 4. described mist projection granulating plunger pump is pressed in 2.5MPa, liquid supply speed at 24mL/min, fluid bed bed temperature 58 DEG C; Detect chemical analysis, physical index to product sampling after screening dedusting, testing result is as follows:
Respectively by the covering slag of three embodiments, after producing in batches, certain iron and steel enterprise's steel-making continuous casting onsite application situation is as follows at home:
Certain sheet billet continuous casting technique, casting section 220 × 1800mm
2, pulling rate 1.1 ~ 1.45m/min, molten steel chemical index (unit: wt%) is: C0.14 ~ 0.18, Si0.22 ~ 0.35, Mn0.40 ~ 0.55, P≤0.015, S≤0.015.Open when watering starting, covering slag of the present invention is evenly pushed crystallizer, and require the whole molten steel face of uniform fold, the total thickness of slag layer of covering slag is between 45 ~ 55mm.Open after watering, steel liquid fluctuating is in ± 3mm, and pulling rate is stabilized in 1.3m/min, now measures liquid slag layer thickness about 11mm.Measure a liquid slag layer every 30min, its thickness is at 8 ~ 15mm.In casting cycle, this covering slag is sprawled well in crystallizer, without clustering phenomena, flame is moderate, change slag is uniform and stable; Slag bar is less and regular, does not need to carry out choosing the operation of slag bar in casting process, and heat flow curve is steady, and through statistics, the average slag consumption of this covering slag is at 0.32 ~ 0.36Kg/ ton steel.Check after strand cold conditions, oscillation mark is clear, regular, more shallow, and without depression, crackle, slag phenomenon, casting billet surface flat smooth is without exception; Adopt the covering slag that conventional formulation and solder flux waste residue formula are produced, after producing for strand, product primes qualification rate is as shown in the table:
Solder flux waste residue formula can make strand primes qualification rate promote 3.0 ~ 3.8% qualification rates on year-on-year basis.
Claims (4)
1. a slab continuous crystallizer protecting slag, is characterized in that, adopt solder flux waste residue as raw material, its chemical composition and weight percent content comprise: SiO
228 ~ 30, CaO35 ~ 37, MgO3.3 ~ 4.8, Fe
2o
30.7 ~ 1.3, Al
2o
35 ~ 7, Na
2o9 ~ 11, F8 ~ 10, C
gu3 ~ 5, fusing point 1090 ~ 1130 DEG C, viscosity 0.12 ~ 0.14PaS.
2. prepare a method for slab continuous crystallizer protecting slag as claimed in claim 1, it is characterized in that, comprise the following steps:
1. pre-treatment of raw material and detection: stirred by solder flux waste residue forklift batch and mix, control its water content 0.3 ~ 0.8%, and be processed into 290 ~ 310 object micro mists, after discharging opening carries out deironing, detects chemical analysis to the sampling of solder flux waste residue;
2. covering slag formula Design: as required, utilizes solder flux waste residue and other all kinds of raw material, designs formula;
3. batching and slurrying: by solder flux waste residue formula, raw material is added in pulping tank the pulping that adds water;
4. mist projection granulating: by the slip that stirs by plunger displacement pump pressure atomization granulation;
5. sieve dedusting and Product checking: after being sieved with 20 ~ 60 object vibratory sieves by particle spray granulation covering slag, chemical analysis, physical index are detected to product sampling.
3. the preparation method of slab continuous crystallizer protecting slag as claimed in claim 2, is characterized in that:
In described batching and slurrying, pulping time 62 ~ 70min, water content 27 ~ 30%.
4. the preparation method of slab continuous crystallizer protecting slag as claimed in claim 2, is characterized in that:
Described mist projection granulating plunger pump is pressed in 2.2 ~ 2.5MPa, liquid supply speed at 20 ~ 23mL/min, fluid bed bed temperature 56 ~ 58 DEG C.
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|---|---|---|---|
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| CN104841901A (en) * | 2015-05-11 | 2015-08-19 | 首钢总公司 | Method for improving solidifying ditch on surface of ultra-low carbon steel continuous casting slab |
| CN105772652B (en) * | 2016-03-23 | 2017-12-08 | 河南省西保冶材集团有限公司 | Ladle furnace lining cleaner special and its application method |
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| JPH08281397A (en) * | 1995-04-14 | 1996-10-29 | Nippon Steel Corp | Powder for continuous casting of cu-, sn-containing steel |
| JP3574427B2 (en) * | 2001-09-19 | 2004-10-06 | 日本冶金工業株式会社 | Continuous casting powder and continuous casting method for Ti and Al-containing steel |
| CN100443216C (en) * | 2007-05-17 | 2008-12-17 | 武汉钢铁(集团)公司 | Method for preparing continuous casting protecting slag by using continuous casting sheet iron slag |
| CN101433950B (en) * | 2008-12-03 | 2011-07-27 | 宜兴市振球炉料有限公司 | Method for preparing protecting residue from recovery refining slag |
| CN102430730B (en) * | 2011-12-31 | 2014-05-28 | 西峡龙成冶金材料有限公司 | Method for producing continuous casting crystallizer mould powders by utilizing electrolytic aluminum waste residues |
| CN102814473A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Preparation method of low-viscosity casting powder for preparing steelmaking cast ingots |
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