CN103785805B - A kind of square billet middle low carbon steel continuous crystallizer protecting slag and production method thereof - Google Patents
A kind of square billet middle low carbon steel continuous crystallizer protecting slag and production method thereof Download PDFInfo
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Abstract
The invention discloses a kind of square billet middle low carbon steel continuous crystallizer protecting slag and production method thereof, described covering slag composition (unit: Wt? %) comprising: CaO? 29～32, SiO228～31、MgO？1.6～2.2、Fe2O3？1.6～2.5、Al2O36.5～8.5、Na2O？4.5～6.5、F4.5～6.5、CGu11.5～13.5; Described production method comprises that pre-treatment of raw material and detection, covering slag formula Design, batching and slurrying, mist projection granulating, screening dedusting and product detect; This method production cost is low, can improve again quality and the yellow phosphorus waste slag utilization rate of covering slag, large to environment contribution; after testing, adopt yellow phosphorus waste slag as raw material, compared with conventional raw material; 256～309 yuan/ton of costs, for the production of rear, strand one-level qualification rate improves 2.4～2.9% on year-on-year basis.
Description
Technical field
The invention belongs to metallurgic auxiliary materials technical field, be specifically related to a kind of square billet middle low carbon steel continuous crystallizer protecting slag andIts production method.
Background technology
At present, Chinese Steel Consumption slowdown in growth, iron and steel production capacity is seriously superfluous, and crude fuel price run at high level, makes iron and steelIndustry benefit vanishing interest rate or loss. Each iron and steel enterprise all reduces the procurement price of all kinds of covering slag products one after another, but continuous castingHow all kinds of raw materials for production rise in price of crystallizer protecting residue, accomplish that cost efficiency is extremely heavy to the existence of covering slag enterpriseWant. In the prior art, continuous crystallizer protecting slag is all taking wollastonite, aluminium stone, lime stone as base-material, with fluorite, white alkali etc.For flux material, then make production with addition of carbonaceous material, wherein wollastonite, aluminium stone, fluorite material occupy in covering slagSignificant proportion, use amount is large, a large amount of exploitations can destroy the ecological balances, cause environmental pollution, and these materials all belong to can notRegenerated resources, price is comparatively expensive, adds the processing charges such as fragmentation, grinding, makes being produced into of continuous crystallizer protecting slagThis is high, has restricted the research and development of continuous crystallizer protecting slag, therefore finds substitution material with low cost just aobviousMust obtain rather crucial. A kind of melting taking silicate as main component of discharging when yellow phosphorus waste slag is electrothermal way production yellow phosphorus is producedThing, utilizes yellow phosphorus waste slag mainly for the production of construction material, Binder Materials, mineralizer etc., from the present situation of utilizing of Phosphorus Slag at presentSee, although the application approach of phosphorus slag is extensive, and phosphorus slag is as composite material and mineral admixture, result of use be not less than slag andFlyash and slag, but total utilization rate is not high, and China produces phosphorus slag more than 500 ten thousand per year, comes into operation on a small quantity except producing in cement, largeAmount yellow phosphorus waste slag is disposed in stacking mode, and waste resource takies again a large amount of soils, and air-dry rear yellow phosphorus waste slag dust is to surrounding enviromentEndanger larger, because yellow phosphorus waste slag belongs to silicate glass body, the yellow phosphorus waste slag of stacking under rainwater drip washing, P, F stripping gradually,In depth, enter in water source and plant, cause P, F to pollute.
The chemical composition of yellow phosphorus waste slag depends on the chemical composition of rock phosphate in powder used, silica and coke while producing yellow phosphorus and joinsRatio, in rock phosphate in powder, CaO content height has directly determined the CaO content of phosphorus slag, the proportional quantity major effect phosphorus of silica and tcrude oreSlag SiO2Content and SiO2/ CaO value, is subject to the impact of phosphorus production technique, and the chemical composition of various places phosphorus slag is very similar. The master of phosphorus slagWanting composition is SiO2、CaO、Al2O3, contain in addition a small amount of MgO, Fe2O3、P2O5、F、K2O、Na2O etc., wherein SiO2And CaOTotal amount is generally more than 85%, and the content of CaO is greater than SiO2，SiO2, CaO content is about respectively 41～42%, 42～43%,Both mass percents approach 1:1 substantially, from the viewpoint CaO-SiO of covering slag Theoretical Design2-Al2O3On ternary phase diagrams,It is more satisfactory covering slag raw material. And covering slag main component CaO, SiO2、Al2O3、MgO、Fe2O3、Na2O、CaF2、Li2O withAnd carbon granules, CaO and SiO2Account for 60%～70%, basicity is conventionally 0.8～1.2, and a large amount of analysis results show, yellow phosphorus waste slagMain component substantially conform to the main component of continuous crystallizer protecting slag, and Yellow Phosphorous Plant for improve waste residue activity so thatIn deslagging, mostly adopt stokehold high pressure water quenching technology, make granular waste residue, Phosphorus Slag grade is thinner, and the following particle of 0.05mm accounts for86%, median particle diameter 0.021mm, can save the processing charges such as exploitation, fragmentation, makes it can be used as continuous crystallizer protecting slag and usesThe first-selection of substitution material, added value is high, makes again the utilization of resources reach maximization, rationalize. Granular yellow phosphorus waste slag taking glassy state asMain, vitreum content reaches more than 90%, and potential mineral facies are wollastonite and cuspidine, also has in addition partially crystallizable phase, granular HuangThe vitreous structure of phosphorus waste residue makes it have higher lateral reactivity, is desirable metallurgical continuous casting covering slag base-material.
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 point fluctuation as far as possible, raw material selects to accomplish composition rationally, and composition is steadyDetermine, should meet the needs of continuous casting quality, economy again, gathers materials on the spot as far as possible, makes full use of local waste resource,As domestic some covering slag raw material has glass dust (SiO2Be greater than 70%, Na2O and be greater than 13%), cement, blast furnace slag, flue dust etc.Number of patent application is the patent " a kind of method of 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, and waste slag of electrolytic aluminium is mainly used in replacing aluminium stone, fluorite, carbonaceous materialMaterial, has saved cost, but contained SIO2、Fe2O3Unstable, need to repeatedly check mixing. In addition, covering slag adopts some industryWaste material is during as base-material, and 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 has been failedEffect reduces the kind of base-material, is prone to sub-melting phenomenon in covering slag fusion process.
Summary of the invention
The object of the invention is in order to make up above-mentioned deficiency, provide a kind of square billet middle low carbon steel continuous crystallizer protecting slag andIts production method, the method reduces production costs effectively, can improve again the quality of continuous crystallizer protecting slag, and has improved HuangPhosphorus waste residue utilization rate.
A kind of square billet middle low carbon steel continuous crystallizer protecting slag, its chemical composition and content (unit: Wt%) comprising: CaO29～32、SiO228～31、MgO1.6～2.2、Fe2O31.6～2.5、Al2O36.5～8.5、Na2O4.5～6.5、F4.5～6.5、CGu11.5～13.5,1090～1130 DEG C of fusing points, viscosity 0.35～0.45PaS.
A production method for square billet middle low carbon steel continuous crystallizer protecting slag, comprises the following steps:
1. pre-treatment of raw material and detection: yellow phosphorus waste slag is stirred in batches and is mixed with forklift, control its water content 0.3～0.8%, and be processed into after 290～310 object micro mists, to yellow phosphorus waste slag, sampling detects chemical composition;
2. covering slag formula Design: as required, utilize yellow phosphorus waste slag and other all kinds of raw materials, design formula;
3. batching and slurrying: press yellow phosphorus waste slag formula, raw material is added to the pulping that adds water in pulping tank;
4. mist projection granulating: by the slip stirring by plunger displacement pump pressure atomization granulation;
5. sieving dedusting and product detects: mist projection granulating gained covering slag particle 20～60 object vibratory sieves are sievedAfter point, to product, sampling detects chemical composition, physical index.
In described batching and slurrying, pulping time 60～70min, water content 31～34%;
Described mist projection granulating plunger pump is pressed in 2.5～2.9MPa, and liquid supply speed is at 21～25mL/min, bed temperature 63～66℃。
The present invention uses by effectively cheap yellow phosphorus waste slag raw material being added in continuous crystallizer protecting slag formula, itsIn the chemical element such as contained fluorine, potassium, silicon, calcium, magnesium, aluminium can substitute or part substitutes institute in continuous crystallizer protecting slag formulaOne or more of raw material that use this chemical element, not only reduced production cost, and the capability and performance of product meet skillArt standard, has greatly improved yellow phosphorus waste slag utilization rate, effectively reduces bulk deposition and the severe contamination problem of yellow phosphorus waste slag, hasWell environmental benefit and social benefit. The basic phase of main component of yellow phosphorus waste slag main component and continuous crystallizer protecting slagSymbol, basicity approaches 1:1, and Phosphorus Slag grade is thinner, can save the processing charges such as exploitation, fragmentation, and added value is high, makes again resource profitWith reaching maximization, rationalizing. Granular yellow phosphorus waste slag, taking glassy state as main structure makes it have higher lateral reactivity, is reasonThe continuous crystallizer protecting slag base-material of thinking. Yellow phosphorus waste slag is through homogenizing, and every comparison of ingredients is stable, its mean value and sampling value baseThis is consistent, reaches the technical requirement of material purchases error ± 1% in covering slag. In the mistake of preparing continuous crystallizer protecting slag productIn journey, do not need repeated examinations, reduce inspection cost.
The present invention adopts mist projection granulating to carry out slip and is dried, and forms hollow bead shape covering slag, and utilizing plunger displacement pump to pressurize willSlip is delivered to spray drying tower top, and pump pressure, at 2.5～2.9MPa, makes mist projection granulating liquid supply speed at 21～25mL/min, at thisUnder speed, can make the full and uniform atomization of slip, the less and regular shape of particle, covering slag forms hollow bead, can obtainLower 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, fluidisationBed tempertaure is located at 63～66 DEG C, can further regulate and control the moisture of particle. Have good fluidity, composition is even, adiabatic heat-insulationGood, moisture is low, can meet the demand of continuous casting good quality and high output, makes molten steel temperature in tundish fluctuation less, prevents molten steel twoInferior oxidation and dross inclusion adsorption, and do not crust, and there is good environment protecting. Gained covering slag steady quality, meets standard.
The present invention adopts yellow phosphorus waste slag as raw material, substitutes part raw material in continuous crystallizer protecting slag, and gained producesProduct steady quality, had both reduced production cost, can meet again the required standard of enterprise; The process optimization that mist projection granulating is carried out,Effectively improve covering slag quality and mass output rate, reduced the bulk density of covering slag, improved the paving of covering slag at molten steel surfaceExhibition speed, what can form rapidly suitable thickness is three layers of melting structure, has both had good heat preservation and insulation, has againGood absorb inclusion thing ability and prevent secondary oxidation of steel, and do not crust. After testing, adopt yellow phosphorus waste slag as raw material,Compared with conventional raw material, the cost of covering slag 256～309 yuan/ton, for the production of rear, strand one-level qualification rate is on year-on-year basisImprove 2.4～2.9%.
Detailed description of the invention
A kind of square billet middle low carbon steel continuous crystallizer protecting slag, its chemical composition and content (unit: Wt%) comprising: CaO29～32、SiO228～31、MgO1.6～2.2、Fe2O31.6～2.5、Al2O36.5～8.5、Na2O4.5～6.5、F4.5～6.5、CGu11.5～13.5,1090～1130 DEG C of fusing points, viscosity 0.35～0.45PaS.
A production method for square billet middle low carbon steel continuous crystallizer protecting slag, comprises the following steps:
The production method of this covering slag, comprises the following steps:
1. yellow phosphorus waste slag pretreatment and detection: yellow phosphorus waste slag is stirred in batches and is mixed with forklift, control its water content 0.3～0.8%, and be processed into after 290～310 object micro mists, to yellow phosphorus waste slag, sampling detects chemical composition (unit, wt%), detects knotFruit is as shown in the table:
| Composition | SiO2 | CaO | MgO | Fe2O3 | Al2O3 | Na+ | F- | K2O | S | P |
| 1 | 41.80 | 42.83 | 3.34 | 0.24 | 3.96 | 0.78 | 2.16 | 1.59 | 0.80 | 0.89 |
| 2 | 41.24 | 43.13 | 2.98 | 0.47 | 3.66 | 0.93 | 2.25 | 1.62 | 0.78 | 0.87 |
| 3 | 41.60 | 43.03 | 3.14 | 0.34 | 3.86 | 0.88 | 2.35 | 1.56 | 0.82 | 0.87 |
| On average | 41.55 | 42.99 | 3.15 | 0.35 | 3.82 | 0.86 | 2.25 | 1.59 | 0.80 | 0.88 |
The result of upper table shows, yellow phosphorus waste slag process homogenizing, and every comparison of ingredients is stable, and its mean value and sampling value are basicUnanimously, reach the technical requirement of material purchases error ± 1% in covering slag. In the process of preparing continuous crystallizer protecting slag productIn do not need repeated examinations, reduce inspection cost.
2. covering slag formula Design: as required, utilize yellow phosphorus waste slag and other all kinds of raw materials, design formula;
3. batching and slurrying: press yellow phosphorus waste slag formula, raw material is added to the pulping that adds water in pulping tank, described pulping time 60～70min, water content 31～34%;
4. mist projection granulating: by the slip stirring by plunger displacement pump pressure atomization granulation, described mist projection granulating plunger pumpBe pressed in 2.5～2.9MPa, liquid supply speed is at 21～25mL/min, 63～66 DEG C of bed temperatures;
5. sieving dedusting and product detects: mist projection granulating gained covering slag particle 20～60 object vibratory sieves are sievedAfter point, to product, sampling detects chemical composition, physical index.
Embodiment mono-
In above-mentioned production technology, yellow phosphorus waste slag 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, 24% yellow phosphorus waste slag replace in original formulation 7% fluorite, 3% aluminium vanadine,6% glass stone, 7% wollastonite, 4% calcite, 2% ice crystal, additional 5% quartz. The cost of raw material of original formulationBe 1324.8 yuan/ton, yellow phosphorus waste slag is by 350 yuan/ton of calculating, and the cost of raw material of new formula is 1015.4 yuan, the cost of raw materialReduce by 309.4 yuan/ton.
In technique 3. in described batching and slurrying, pulping time 60min, water content 31%; 4. described mist projection granulatingPlunger pump is pressed in 2.5MPa, and liquid supply speed is at 21mL/min, 63 DEG C of fluid bed bed temperature; After screening dedusting, product is sampledDetect chemical composition, physical index, testing result is as follows:
Embodiment bis-
In above-mentioned production technology, yellow phosphorus waste slag 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, 30% yellow phosphorus waste slag replace in original formulation 2.5% fluorite, 1% aluminium vanadine,31% wollastonite, 1% ice crystal, additional 3.5% quartz, 2% calcite. The cost of raw material of original formulation is 1250.5Yuan/ton, yellow phosphorus waste slag is by 350 yuan/ton of calculating, and the cost of raw material of new formula is 994.4 yuan, and the cost of raw material reduces by 256.1Yuan/ton.
In technique 3. in described batching and slurrying, pulping time 65min, water content 33%; 4. described mist projection granulatingPlunger pump is pressed in 2.7MPa, and liquid supply speed is at 23mL/min, 64 DEG C of fluid bed bed temperature; After screening dedusting, product is sampledDetect chemical composition, physical index, testing result is as follows:
Embodiment tri-
In above-mentioned production technology, yellow phosphorus waste slag 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, 27% yellow phosphorus waste slag replace in original formulation 3% fluorite, 2% aluminium vanadine,7% lime stone, 3% bentonite, 18% wollastonite, 3% ice crystal, additional 4% quartz, 5% calcite. Original formulationThe cost of raw material be 1317.9 yuan/ton, yellow phosphorus waste slag is by 350 yuan/ton of calculating, the cost of raw material of new formula is 1033.4Unit, the cost of raw material reduces by 284.5 yuan/ton.
In technique 3. in described batching and slurrying, pulping time 70min, water content 34%; 4. described mist projection granulatingPlunger pump is pressed in 2.9MPa, and liquid supply speed is at 25mL/min, 66 DEG C of fluid bed bed temperature; After screening dedusting, product is sampledDetect chemical composition, physical index, testing result is as follows:
Respectively by the covering slag of three embodiment, after producing in batches, certain iron and steel enterprise's steel-making continuous casting scene at homeService condition is as follows:
Certain billet continuous casting technique, casting section 200 × 200mm2, pulling rate 2.8～3.5m/min, amplitude ± 3mm, molten steelLearning index (unit: wt%) is: C0.14～0.18, Si0.35～0.45, Mn0.45～0.65, P≤0.025%, S≤0.021%; Open and water after starting, this covering slag is evenly added in crystallizer, uniform fold crystallizer molten steel surface, total slag blanket (powderSlag blanket, sinter layer, three layers of sum of liquid slag layer) thickness is between 35～45mm; After opening and watering, steel liquid fluctuating in 3mm, pulling rateBe stabilized in 3.2m/min, now measure liquid slag layer thickness 10mm left and right. After this every 30min measures a liquid slag layer, and its thickness is equalAt 8～12mm. In casting cycle, this covering slag spreadability in crystallizer is good, without clustering phenomena, to change slag uniform and stable;Substantially lead to a phenomenon without slag bar, in casting process, do not need to choose slag bar. Covering slag slag consumption is at 0.31～0.35Kg/ ton steel. StrandCooling rear inspection, oscillation mark is clear, regular, more shallow, and without being stained with slag, slag phenomenon, casting billet surface is smooth smooth without abnormal, adopts conventionalThe covering slag that formula and formula of the present invention are produced, after producing for strand, product primes qualification rate is as shown in the table:
It is 2.4～2.9% qualified that the covering slag that yellow phosphorus waste slag formula is produced can make strand primes qualification rate promote on year-on-year basisRate.
Claims (3)
1. produce a method for square billet middle low carbon steel continuous crystallizer protecting slag, its chemical composition and content (unit: Wt%)Comprise: CaO29～32, SiO228～31、MgO1.6～2.2、Fe2O31.6～2.5、Al2O36.5～8.5、Na2O4.5～6.5、F4.5～6.5、CGu11.5～13.5,1090～1130 DEG C of fusing points, viscosity 0.35～0.45PaS, is characterized in that, bagDraw together following steps:
1. pre-treatment of raw material and detection: yellow phosphorus waste slag is stirred and mixed in batches with forklift, control its water content 0.3～0.8%,And be processed into after 290～310 object micro mists, to yellow phosphorus waste slag, sampling detects chemical composition;
2. covering slag formula Design: as required, utilize yellow phosphorus waste slag and other all kinds of raw materials, design formula;
3. batching and slurrying: press yellow phosphorus waste slag formula, raw material is added to the pulping that adds water in pulping tank;
4. mist projection granulating: by the slip stirring by plunger displacement pump pressure atomization granulation;
5. sieving dedusting and product detects: mist projection granulating gained covering slag particle 20～60 object vibratory sieves are sievedAfter, to product, sampling detects chemical composition, physical index.
2. the production method of square billet middle low carbon steel continuous crystallizer protecting slag as claimed in claim 1, is characterized in that: described inIn batching and slurrying, pulping time 60～70min, water content 31～34%.
3. the production method of square billet middle low carbon steel continuous crystallizer protecting slag as claimed in claim 1, is characterized in that: described inMist projection granulating plunger pump is pressed in 2.5～2.9MPa, and liquid supply speed is at 21～25mL/min, 63～66 DEG C of bed temperatures.
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| CN104907513A (en) * | 2015-06-09 | 2015-09-16 | 石家庄钢铁有限责任公司 | Method for continuous casting of large rectangular billet of low-carbon hadifield steel |
| CN105344955B (en) * | 2015-12-18 | 2018-08-24 | 河南通宇冶材集团有限公司 | A kind of high intensity continuous crystallizer protecting slag and preparation method thereof |
| CN107931551B (en) * | 2017-12-27 | 2019-08-30 | 河南通宇冶材集团有限公司 | A kind of bloom middle low carbon steel covering slag and preparation method thereof |
| CN111604482A (en) * | 2020-04-23 | 2020-09-01 | 华北理工大学 | Ultra-high pulling speed sheet billet continuous casting covering slag for low-carbon low-alloy steel |
| CN111496208B (en) * | 2020-06-10 | 2021-08-13 | 广东韶钢松山股份有限公司 | Preparation method of low-carbon steel continuous casting billet and secondary cooling water design method |
| JP7032600B1 (en) * | 2021-09-01 | 2022-03-08 | 日本冶金工業株式会社 | Mold powder for continuous casting and continuous casting method used for Fe—Ni based alloys or Ni-based alloys. |
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