CN103639380A - Continuous casting used crystallizer casting powder for plate blank and preparing method thereof - Google Patents
Continuous casting used crystallizer casting powder for plate blank and preparing method thereof Download PDFInfo
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- CN103639380A CN103639380A CN201310532730.1A CN201310532730A CN103639380A CN 103639380 A CN103639380 A CN 103639380A CN 201310532730 A CN201310532730 A CN 201310532730A CN 103639380 A CN103639380 A CN 103639380A
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- slag
- waste residue
- solder flux
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Abstract
The invention discloses continuous casting used crystallizer casting powder for a plate blank and a preparing method thereof. The casting powder comprises, by weight, 28-30% of SiO2, 35-37% of CaO, 3.3-4.8% of MgO, 0.7-1.3% of Fe2O3, 5-7% of Al2O3, 9-11% of Na2O, 8-10% of F, 3-5% of solid carbon. The method comprises the steps of raw material preprocessing and detection, casting powder formula design, batching and slurrying, spray granulation, screen-dedusting and product detection. According to the method, the production technology is simple, the amount of dust is small, spreadability is good, slugging can be achieved evenly and stably, and contribution to the environment is big. Detection proves that compared with a method using conventional raw materials, the method has the advantages that due to the adoption of soldering flux waste residues which serve as the raw material, the cost of the casting powder is reduced by 255-308 yuan/ton, and after the casting powder is used for production, the primary qualified rate of casting blanks is increased by 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 continuous crystallizer protecting slag and preparation method thereof for a kind of slab.
Background technology
China's iron and steel
industrythrough the develop rapidlys of nearly more than ten years, crude steel output was from 1.3 hundred million tons of 7.16 hundred million tons of rising to 2012 of 2000.Yet steel industry of today is being faced with the bottleneck phase of development, be the unordered expansion of production capacity on the one hand, domestic iron and steel production capacity is obviously superfluous; But be the significantly downslide of industry profit margin on the other hand, steel profit high-growth era has been difficult to reproduce, is stepping into one longer adjustment period.Each iron and steel enterprise all reduces and comprises the various raw materials of continuous crystallizer protecting slag, the procurement price of fuel one after another; in addition the various prices of raw and semifnished materials of continuous crystallizer protecting slag are going up always, so the cost efficiency of continuous crystallizer protecting slag enterprise is most important to the existence of enterprise.Ge Jia continuous crystallizer protecting slag enterprise all making great efforts to seek high-quality, cheap raw material substitute the raw material that existing price is higher, reduce costs, and improve the market competitiveness, the ability to ward off risks of raising 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. is flux material, with addition of carbonaceous material, make again production, wollastonite wherein, aluminium stone, fluorite material occupies significant proportion in covering slag, use amount is large, a large amount of exploitations can destroy the ecological balance, cause environmental pollution, and these materials all belong to non-renewable resources, price is comparatively expensive, add fragmentation, the processing charges such as grinding, make the production cost of continuous crystallizer protecting slag high, restricted the research and development of continuous crystallizer protecting slag, therefore finding substitution material with low cost just seems rather crucially.
Solder flux waste residue is submerged arc bead welding waste material later, and its main component is: SiO
2, CaO, MgO, Fe
2o
3, Al
2o
3, Na
2o, F, Fe.Through periphery being used to the metallurgical equipment manufacturer investigation of solder flux, a Harmann Berstorff, Maschinenbau GmbH that produces 1W cover metallurgical equipment per year, the solder flux waste residue producing for 1 year just has 1000 tons of left and right, and the main method of processing at present solder flux waste residue is: topple over, landfill, cause the wasting of resources, and contain Na in solder flux waste residue
2o, F stack in the open or landfill passes through rainwater shower afterwards, permeate the ground, and can cause soil and groundwater to pollute.And contained silicon, calcium, magnesium, aluminium, sodium, fluorine is element necessary in continuous crystallizer protecting slag in solder flux waste residue; by add solder flux waste residue in continuous crystallizer protecting slag; can substitute or partly substitute one or more that contain this chemical element raw material in continuous crystallizer protecting slag formula; both reduce the production cost of continuous crystallizer protecting slag, realized the processing problem that economic benefit has effectively solved 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 its raw material physical property as far as possible stable, therefore should be reduced to a minute fluctuation as far as possible, raw material is selected will accomplish to form rationally; stable components; should meet the needs of continuous casting quality, economy, gathers materials on the spot as far as possible again; make full use of local waste resource, as domestic some covering slag raw material 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 patent < < method > > who utilizes 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; saved cost, but contained SIO
2, Fe
2o
3unstable, need to repeatedly 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, in covering slag fusion process, is prone to sub-melting phenomenon.
Summary of the invention
The present invention is in order to make up above-mentioned deficiency; continuous crystallizer protecting slag and preparation method thereof for a kind of slab is provided; the method production technology is simple; dust is few; spreadability is good, changes slag uniform and stable, has improved the utilization rate of strand one-level qualification rate and solder flux waste residue; effectively reduced the production cost of continuous crystallizer protecting slag to environment contribution greatly.
A slab continuous crystallizer protecting slag, its chemical composition and content (unit: Wt %) comprising: SiO
228～30, CaO 35～37, MgO 3.3～4.8, Fe
2o
30.7～1.3, Al
2o
35～7, Na
2o 9～11, F8～10, C
gu3～5,1090～1130 ℃ of fusing points, viscosity 0.12～0.14PaS.
A preparation method for continuous crystallizer protecting slag for slab, comprises the following steps:
1. pre-treatment of raw material and detection: solder flux waste residue is stirred and mixed in batches with forklift, control its water content 0.3 ~ 0. 8%, and be processed into 290 ~ 310 object micro mists, carry out after deironing at discharging opening, sampling detects chemical analysis to solder flux waste residue;
2. covering slag formula Design: as required, utilize solder flux waste residue and other all kinds of raw materials, design formula;
3. batching and slurrying: press solder flux waste residue and fill a prescription, raw material is added and adds water pulping in pulping tank;
4. mist projection granulating: by the slip stirring by plunger displacement pump pressure atomization granulation;
5. sieving dedusting and product detects: after particle mist projection granulating covering slag is sieved with 20 ~ 60 object vibratory sieves, to product, sampling detects chemical analysis, physical index;
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, and liquid supply speed is at 20～23mL/min, 56～58 ℃ of fluid bed bed temperature.
Raw material solder flux waste residue wide material sources of the present invention; low price; contained Ca, Si, Mg, Al, Na, F element in solder flux waste residue; as raw material, can reduce the production cost of slab middle low carbon steel continuous crystallizer protecting slag; and effectively solved the processing problem of solder flux waste residue; for the reasonable use of solder flux waste residue provides new method, effectively reduce bulk deposition and the severe contamination problem of solder flux waste residue, economic benefit and environmental benefit are remarkable.In addition, more stable through every composition in the solder flux waste residue of deironing and homogenizing, can reach the specification requirement of material purchases error ± 1% in covering slag, prepare slab with not needing check repeatedly in the process of continuous crystallizer protecting slag product, reduce inspection cost; Solder flux waste residue ore deposit is mutually simple, can form fast stable melt cinder film, has avoided secondary oxidation of steel; Seldom, it is removed through slurrying and mist projection granulating for carbonate, sulfide, nitride-based mineral, has avoided contacting with molten steel and has caused secondary pollution, inclusion content in melting steel mostly to be acid silicates impurity, has stronger dross inclusion adsorption ability.
The present invention adopts mist projection granulating to granulate with dry, utilize plunger displacement pump pressurization that slip is delivered to spray drying tower top, pump pressure is at 2.2～2.5MPa, make mist projection granulating liquid supply speed at 20～23mL/min, under this speed, can make the full and uniform atomization of slip, 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 ℃, can further reduce the moisture of covering slag particle.
The present invention adopts welding slag waste residue as raw material, the process optimization that mist projection granulating is carried out, covering slag quality and mass output rate have effectively been improved, improved the spreading rate of covering slag at molten steel surface, in casting process, can form rapidly the melting structure of suitable thickness, 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, to change slag uniform and stable, gained covering slag steady quality, both reduce production cost, and can meet again the required standard of enterprise; After testing, adopt solder flux waste residue as raw material, compare with conventional raw material, the cost of covering slag 255～308 yuan/ton, for the production of rear, strand one-level qualification rate improves 3.0～3.8% on year-on-year basis.
The specific embodiment
A slab continuous crystallizer protecting slag, its chemical composition and content (unit: Wt %) comprising: SiO
228～30, CaO 35～37, MgO 3.3～4.8, Fe
2o
30.7～1.3, Al
2o
35～7, Na
2o 9～11, F8～10, C
gu3～5,1090～1130 ℃ of fusing points, viscosity 0.12～0.14PaS.
The concrete production technology of this covering slag is as follows:
1. pre-treatment of raw material and detection: collect the solder flux waste residue of periphery metallurgical equipment manufacturer, solder flux waste residue is stirred and mixed in batches with forklift, control its water content 0. 3～0. 8%, and it is processed as to 290～310 object micro mists, carry out deironing at discharging opening; To solder flux waste residue, sampling detects chemical analysis, records chemical analysis as shown in the table:
As seen from the above table, more stable through every composition in the solder flux waste residue of deironing and homogenizing, can reach the specification requirement of material purchases error ± 1% in covering slag, in the process of preparing continuous crystallizer protecting slag product, not need check repeatedly, reduce inspection cost; Solder flux waste residue ore deposit is mutually simple, can form fast stable melt cinder film, has avoided secondary oxidation of steel; Seldom, it is removed through slurrying and mist projection granulating for carbonate, sulfide, nitride-based mineral, has avoided contacting with molten steel and has caused secondary pollution, inclusion content in melting steel mostly to be acid silicates impurity, has stronger dross inclusion adsorption ability;
2. covering slag formula Design: as required, utilize solder flux waste residue and other all kinds of raw materials, design formula;
3. batching and slurrying: press solder flux waste residue and fill a prescription, raw material is added and adds water pulping, described pulping time 62～70min, water content 27～30% in pulping tank;
4. mist projection granulating: by plunger displacement pump pressure atomization granulation, described mist projection granulating plunger pump is pressed in 2.2～2.5MPa by the slip stirring, liquid supply speed is at 20～23mL/min, 56～58 ℃ of fluid bed bed temperature;
5. sieving dedusting and product detects: after particle mist projection granulating covering slag is sieved with 20 ~ 60 object vibratory sieves, to product, sampling detects chemical analysis, physical index.
Embodiment mono-
In above-mentioned production technology, solder flux waste residue formula can be as shown in the table:
If use conventional raw material, fill a prescription as shown in the table:
From above Data Comparison, 18% wollastonite, 5% ice crystal, 4% fluorite, 3% calcite, 4% magnesium powder, 3% alum clay in 27% solder flux waste residue replacement conventional formulation, additional 5% soda ash, 5% quartz; 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, and liquid supply speed is at 24mL/min, 56 ℃ of fluid bed bed temperature; After screening dedusting, to product, sampling detects chemical analysis, physical index, and testing result is as follows:
Embodiment bis-
In above-mentioned production technology, solder flux waste residue formula can also be as shown in the table:
If use conventional raw material, fill a prescription as shown in the table:
From above Data Comparison, 3% ice crystal, 11% wollastonite, 2% calcite, 4% flint clay, 2% alum clay in 18% solder flux waste residue replacement conventional formulation, 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, and liquid supply speed is at 24mL/min, 57 ℃ of fluid bed bed temperature; After screening dedusting, to product, sampling detects chemical analysis, physical index, and testing result is as follows:
Embodiment tri-
In above-mentioned production technology, solder flux waste residue formula can also be as shown in the table:
If use conventional raw material, fill a prescription as shown in the table:
From above Data Comparison, 24% solder flux waste residue replaces in conventional formulation 12% wollastonite, 5% fluorite, 9% calcium carbonate, 3% glass stone, 2% alum clay, adds 4% calcite outward, 3% quartz; 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, and liquid supply speed is at 24mL/min, 58 ℃ of fluid bed bed temperature; After screening dedusting, to product, sampling detects chemical analysis, physical index, and testing result is as follows:
By the covering slag of three embodiment, after producing in batches, the on-the-spot service condition of certain iron and steel enterprise's steel-making continuous casting is as follows at home respectively:
Certain sheet billet continuous casting technique, casting section 220 * 1800mm
2, pulling rate 1.1～1.45m/min, molten steel chemical index (unit: be wt%): C 0.14～0.18, Si 0.22～0.35, Mn 0.40～0.55, P≤0.015, S≤0.015.Open while watering starting, covering slag of the present invention is evenly pushed to crystallizer, require the whole molten steel face of uniform fold, the total thickness of slag layer of covering slag is between 45～55mm.After opening and watering, steel liquid fluctuating is in ± 3mm, and pulling rate is stabilized in 1.3 m/min, now measures liquid slag layer thickness 11mm left and right.Every 30min, measure a liquid slag layer, its thickness is at 8～15mm.In casting cycle, this covering slag sprawls well in crystallizer, moderate without clustering phenomena, flame, to change slag uniform and stable; Slag bar is less and regular, does not need to choose the operation of slag bar in casting process, and heat flow curve is steady, and by statistics, the average slag consumption of this covering slag is at 0.32～0.36Kg/ ton steel.After strand cold conditions, check, oscillation mark is clear, regular, more shallow, and without depression, crackle, slag phenomenon, casting billet surface is smooth smooth without abnormal; The covering slag that adopts conventional formulation and solder flux waste residue formula to produce, 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 on year-on-year basis 3.0～3.8% qualification rates.
Claims (4)
1. a slab continuous crystallizer protecting slag, is characterized in that, its chemical composition and content (unit: Wt %) comprising: SiO
228～30, CaO 35～37, MgO 3.3～4.8, Fe
2o
30.7～1.3, Al
2o
35～7, Na
2o 9～11, F
?8～10, C
gu3～5,1090～1130 ℃ of fusing points, viscosity 0.12～0.14PaS.
2. prepare a method for continuous crystallizer protecting slag for slab as claimed in claim 1, it is characterized in that, comprise the following steps:
1. pre-treatment of raw material and detection: solder flux waste residue is stirred and mixed in batches with forklift, control its water content 0.3 ~ 0. 8%, and be processed into 290 ~ 310 object micro mists, carry out after deironing at discharging opening, sampling detects chemical analysis to solder flux waste residue;
2. covering slag formula Design: as required, utilize solder flux waste residue and other all kinds of raw materials, design formula;
3. batching and slurrying: press solder flux waste residue and fill a prescription, raw material is added and adds water pulping in pulping tank;
4. mist projection granulating: by the slip stirring by plunger displacement pump pressure atomization granulation;
5. sieving dedusting and product detects: after particle mist projection granulating covering slag is sieved with 20 ~ 60 object vibratory sieves, to product, sampling detects chemical analysis, physical index.
3. the preparation method of continuous crystallizer protecting slag for slab 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 continuous crystallizer protecting slag for slab as claimed in claim 2, is characterized in that:
Described mist projection granulating plunger pump is pressed in 2.2～2.5MPa, and liquid supply speed is at 20～23mL/min, 56～58 ℃ of fluid bed bed temperature.
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Cited By (2)
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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 |
| CN105772652A (en) * | 2016-03-23 | 2016-07-20 | 河南省西保冶材集团有限公司 | Special cleaner for molten iron ladle furnace liner and using method thereof |
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| 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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2013
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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 |
| CN105772652A (en) * | 2016-03-23 | 2016-07-20 | 河南省西保冶材集团有限公司 | Special cleaner for molten iron ladle furnace liner and using method thereof |
| 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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| CN103639380B (en) | 2016-04-27 |
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