CN105328151A - Casting powder for continuous casting crystallizer and preparation method of casting powder - Google Patents

Casting powder for continuous casting crystallizer and preparation method of casting powder Download PDF

Info

Publication number
CN105328151A
CN105328151A CN201510886655.8A CN201510886655A CN105328151A CN 105328151 A CN105328151 A CN 105328151A CN 201510886655 A CN201510886655 A CN 201510886655A CN 105328151 A CN105328151 A CN 105328151A
Authority
CN
China
Prior art keywords
parts
slag
casting
sio
crystallizer protecting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510886655.8A
Other languages
Chinese (zh)
Inventor
李继
张国令
陈守杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HENAN TONGYU METALLURGY MATERIALS GROUP CO Ltd
Original Assignee
HENAN TONGYU METALLURGY MATERIALS GROUP CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HENAN TONGYU METALLURGY MATERIALS GROUP CO Ltd filed Critical HENAN TONGYU METALLURGY MATERIALS GROUP CO Ltd
Priority to CN201510886655.8A priority Critical patent/CN105328151A/en
Publication of CN105328151A publication Critical patent/CN105328151A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses casting powder for a continuous casting crystallizer. The casting powder comprises raw materials in parts by weight as follows: 3.5-15 parts of fluorite, 35-55 parts of aedelforsite, 5-15 parts of alkali, 0-2 parts of lithium carbonate, 0-10 parts of diaspore, 0-6 parts of a cement clinker, 1-5 parts of magnesia powder, 2-5 parts of pyrolusite, 0-8 parts of sodium fluoride, 0-5 parts of barium carbonate, 0-5 parts of bentonite, 1-4 parts of coke, 0-8 parts of a carburant, 1-3 parts of carbon black and 1-2 parts of a binder. According to the casting powder, the preparation cost is low; the recovery rate of the casting powder is larger than or equal to 98.5%; the color of the casting powder is uniform; the granularity is uniform; the granulation rate is high; dust is reduced; the melting point of the casting powder is low; the viscosity is low; after the casting powder is added into the crystallizer, the casting powder is melted uniformly and shows excellent spreadability, heat retaining property and adsorptive property; heat is transferred uniformly all around the crystallizer, and the lubrication is excellent; and defects such as concave pits, impurities and the like don't exist on the surface of a casting blank, the internal quality is excellent, and the qualified rate of the casting blank is equal to or larger than 99.8%.

Description

A kind of continuous crystallizer protecting slag and preparation method thereof
Technical field
The invention belongs to steelmaking ingredient technical field, be specifically related to a kind of continuous crystallizer protecting slag and preparation method thereof.
Background technology
Increasingly serious along with iron and steel situation, iron and steel production capacity is seriously superfluous, and crude fuel price run at high level, steel industry benefit is lost year by year.Each iron and steel enterprise reduces the procurement price of all kinds of covering slag product all one after another ,in addition all kinds of raw materials for production rise in price of continuous crystallizer protecting slag, the cost efficiency of metallurgic auxiliary materials enterprise just seems of crucial importance to its existence.High-quality, cheapness, stable raw material are all actively being sought to improve the market competitiveness by Ge Jia covering slag manufacturing enterprise, improve the ability of enterprise's opposing market risk.
MnO in covering slag can not only reduce the fusing point of covering slag, viscosity and setting temperature, can also improve the burn-off rate of covering slag, accelerates the formation of melt cinder, simultaneously less on the crystallization temperature impact of covering slag, is conducive to the heat transfer of stable slag film.What existing covering slag manufacturing enterprise used contains manganese raw material mainly manganese carbonate, is also manganese spar MnCO 3, wherein MnO61.71%, CO 238.29%, proportion is 3.6 ~ 3.7g/cm 3.General said manganese ore is divided into two kinds, manganese carbonate ore and manganese oxide ore.Manganese carbonate ore mainly originates in the rock of underground deep, and manganese oxide ore is generally displayed for the first time on earth's surface, and ground matrix section stands oxidation concentrate by showering and filtering and forms, and is convenient to exploitation and the grade of manganese oxide ore is usually all higher.Manganese carbonate heat resolve obtains MnCO 3→ MnO+CO 2↑ simultaneously, heat in atmosphere and easily change other high price manganese oxide into, MnO is oxidized further and generates MnO 2: MnO+ (1/2) O 2=MnO 2.Manganese carbonate produces CO in the situation of being heated 2gaseous volatilization, increase slag consumption, add a ton consuming cost for steel covering slag, decomposes is an endothermic process in addition, is unfavorable for that covering slag is incubated.
Chinese patent CN101658909B discloses a kind of medium carbon steel wide plate base containing manganese crystallizer protecting residue; its percent mass proportioning is: calcium oxide 36.09, silica 25.40, alundum (Al2O3) 2.40; magnesia 3.34; di-iron trioxide 1.47, manganese carbonate 5.00, calcirm-fluoride 14.00; sodium oxide molybdena 7.30; lithia 0.41, fixed carbon 4.59, basicity of slag CaO/SiO 2: 1.25 ~ 1.50; Use manganese carbonate in the raw materials of the covering slag in this invention, the consumption of this covering slag is larger, and cost is higher.Chinese patent CN103128243B discloses the special continuous crystallizer protecting slag of a kind of high-aluminum steel, and formula is counted: pre-7 ~ 13 parts, molten material, Fluorspar Powder 9 ~ 11 parts; calcined soda for industry 4 ~ 6 parts, carbon black 6 parts, amorphous graphite 3 ~ 6 parts; calcisphere 24 ~ 31 parts, refining slag 17 ~ 25 parts, lithium carbonate 3 parts; bauxite 9 ~ 15 parts; brium carbonate 4 parts, manganese carbonate 3 parts, borax 5 parts; in this invention, the source of MnO is also manganese carbonate, increases the use cost of covering slag.
Summary of the invention
In view of this, the invention provides a kind of continuous crystallizer protecting slag, this covering slag preparation cost is low, good product performance.
Present invention also offers the preparation method of continuous crystallizer protecting slag.
For achieving the above object, the present invention by the following technical solutions:
A kind of continuous crystallizer protecting slag, comprises the raw material of following parts by weight: 3.5 ~ 15 parts, fluorite, wollastonite 35 ~ 55 parts; 5 ~ 15 parts, white alkali, lithium carbonate 0 ~ 2 part, 0 ~ 10 part, aluminium stone; clinker 0 ~ 6 part, magnesia powder 1 ~ 5 part, pyrolusite 2 ~ 5 parts; sodium fluoride 0 ~ 8 part, brium carbonate 0 ~ 5 part, bentonite 0 ~ 5 part; 1 ~ 4 part, coke; carburant 0 ~ 8 part, carbon black 1 ~ 3 part, binding agent 1 ~ 2 part.
Preferably, CaF in described fluorite 2be 92.0% ~ 94.0%, SiO 2≤ 5.0%, S≤0.1%; SiO in described wollastonite 2be 51.5% ~ 54.5%, CaO be 42.5% ~ 45.5%, burn tinctuer≤1.9%; Be Na in described white alkali 2cO 3>=98.0%, bulk density>=0.8g/ml; Al in described aluminium stone 2o 3be 78.0% ~ 82.0%; Described clinker is SiO 2be 19.0% ~ 23.0%, CaO be 63.0% ~ 67.0%, Al 2o 3≤ 7.0%; MgO>=90.0% in described magnesia powder, SiO 2≤ 5.0%, CaO≤5.0%; MnO>=55% in described pyrolusite, Fe 2o 3be 3 ~ 5%, SiO 2be 6.0% ~ 12.0%; SiO in described bentonite 2be 67.5% ~ 70.5%, CaO≤2.0%, Al 2o 3be 14.5% ~ 17.5%.
Preferably, the fineness of described fluorite, wollastonite, aluminium stone, clinker, magnesia powder, pyrolusite, bentonite, coke is 260 ~ 325 orders.
Preferably, described binding agent is sodium carboxymethylcellulose and/or yellow starch gum.
Preferably, described covering slag comprises the chemical composition of following percentage by weight: CaO25.5 ~ 31%, SiO 221.8 ~ 30.5%, Al 2o 32 ~ 10.1%, Na 2o3.5 ~ 12.5%, MgO1 ~ 5%, F2.0 ~ 10%, MnO0.5% ~ 4.0%, fixed carbon 3 ~ 15%.
Preferably, the fusing point of described covering slag is 1080 DEG C ~ 1180 DEG C, and viscosity is 0.1 ~ 0.85PaS.
A preparation method for continuous crystallizer protecting slag, comprises the following steps:
(1) batching slurrying: raw material is added in pulping tank the slurrying that adds water, mixing time is 60 ~ 70min, obtains slip;
(2) mist projection granulating: by slip granulation in plunger displacement pump pressurized delivered to mist projection granulating tower, plunger displacement pump pressure is 0.8 ~ 1.5MPa, and defeated slurry speed is 20 ~ 25L/min, spray sheet aperture is 2.0mm, and tower temperature is 650 ~ 700 DEG C;
(3) screening packaging: sieve out after particle diameter is the mist projection granulating particle of 0.15 ~ 1mm with vibration screen, physical index, the chemical composition of sampling testing product, packaging, warehouse-in.
Preferably, in described step (1), pulp density is 58 ~ 66%.
The invention has the beneficial effects as follows:
Continuous crystallizer protecting slag in the present invention is using wollastonite as base-material, and bentonite is as siliceous material, and clinker, as calcareous material, is also added with fluorite, aluminium stone, clinker, magnesia powder, pyrolusite, sodium fluoride, brium carbonate, coke, carbon black etc.Wherein wollastonite, bentonite, clinker and aluminium stone are SiO 2, Al 2o 3with the main source of CaO, wherein SiO 2and Al 2o 3be the organizator of covering slag network structure, make covering slag slag form glassy phase, be beneficial to strand lubrication; And CaO can also increase the basicity of covering slag, improve the desulfuration efficiency of covering slag; Al in addition 2o 3the electrical conductivity of covering slag can be reduced, reduce energy consumption, suppress the precipitation of F in covering slag, but too much Al 2o 3then can raise fusion temperature and the viscosity of covering slag, reduce covering slag and absorb the Al floated in molten steel 2o 3deng the ability of non-metallic inclusion, therefore, the basicity in the present invention and CaO/SiO 2control at 0.9 ~ 1.31, Al 2o 3content control 2% ~ 10%.
Pyrolusite is added, MnO and MnO in pyrolusite in covering slag 2the physicochemical property of covering slag can be improved, wherein MnO 2as oxidant; the oxidation of coal in covering slag can be impelled; the carbon content of effective suppression enriched carbon layer and molten slag layer; thus effectively can control the thickness of molten slag layer; improve the burn-off rate of covering slag, accelerate the formation of melt cinder, simultaneously less on the crystallization temperature impact of covering slag; be conducive to the heat transfer of stable slag film, the carbon increasing amount of strand can also be suppressed in addition.And MnO continuous distributed is in the molten slag layer of covering slag, can molten steel be prevented to be oxidized by molten steel face and air insulated thus effectively; And a small amount of Fe in pyrolusite 2o 3, can react with the C of rich layer of charcoal, the C content of rich layer of charcoal can be reduced thus the situation of minimizing molten steel recarburization.In addition, relative to other manganese ores such as manganese carbonates, the price of pyrolusite is lower, can reduce the production cost of covering slag.
MgO in covering slag can reduce covering slag fusing point, viscosity, crystallization temperature, improves slag flow, improves interfacial tension, increases the transverse direction heat transfer of covering slag.
Lithium carbonate is added, due to Li in covering slag +sO in the electrostatic potential energy of ion and covering slag network structure 4 4-ion electrostatic potential closely, therefore Li +sO easily and in covering slag network structure 4 4-form ion pair, therefore prevent SO adding of lithium carbonate 4 4-form ion pair with other cations, thus the precipitation of high-melting-point crystalline phase is obstructed, thus improve the glass properties of covering slag, reduce fusing point and the viscosity of covering slag.And the brium carbonate added in covering slag and white alkali are BaO and Na 2the main source of O, and due to Na and Li be same major element, therefore Na 2the character of O is similar to lithium carbonate, also can reduce fusing point and the viscosity of covering slag, and Ba 2+ion electrostatic potential and SO 4 4-ion is very close, therefore brium carbonate add the glass properties also can improving covering slag, in covering slag, therefore add white alkali and brium carbonate can the effect of lithium carbonate in agent protection slag, reduces production cost further.
And fluorite and the sodium fluoride Main Function in covering slag is to provide F; F can replace the divalence oxonium ion in covering slag network structure; covering slag network structure is disintegrated thus the fusing point of reduction covering slag and viscosity; improve the mobility of melt cinder; but the glassy of slag can be destroyed during F too high levels; lubricating condition is worsened, therefore needs the content of F in Control protection slag, in the present invention, the content of F controls 2% ~ 10%.
Carbonaceous material can the burn-off rate of Control protection slag, thus controls the thickness of molten slag layer, can also suppress the harmful effect that excessive additive brings, and can improve the spreadability of covering slag, reduce bonding, can also lubricate crystallizer wall.The present invention adopts that coke, carburant and carbon black are composite is used as carbon materials, not only make the liquid slag layer THICKNESS CONTROL of continuous casting covering slag in stable scope, do not reduce along with the raising of casting machine pulling rate, and can burn-off rate be regulated, improve sintering tendency, improve the heat-insulating property of granulated slag, be conducive to the control of slab quality, further minimizing surface defect of bloom rate, prevent casting billet surface slag inclusion and dry slag, improve processing safety when watering cast steel, in the present invention, the content of fixed carbon controls 3 ~ 15%; If when covering slag is applied to ultra-low-carbon steel; while reducing the carbon content in raw material; polyethylene fibre or active carbon can be added; active carbon or polyethylene fibre can burn prior to carbonaceous material and release gas; reduce the consumption of carbonaceous material; and the residue after polyethylene fibre burning can prevent covering slag from forming caking or producing slag bar, keep the thickness of molten slag layer to stablize, improve cc billet surface quality.
Continuous crystallizer protecting slag in the present invention, preparation cost is low, compares and uses manganese carbonate as the raw material of MnO, and the production cost of covering slag reduces by 10 ~ 15%, the rate of recovery >=98.5% of covering slag.The present invention, through test of many times, adopts yellow starch gum and/or sodium carboxymethylcellulose as binding agent, determines the best preparation technology of covering slag, the color of the covering slag prepared is homogeneous, epigranular, and the intensity of ball improves more than 10%, balling ratio is high, reduces dust; The consumption of the covering slag of preparation is 0.35 ~ 0.45kg/t, and the thickness of melt cinder is 7.8 ~ 8.5mm, and covering slag fusing point is low; viscosity is little; after covering slag adds crystallizer, evenly, the performance of spreadability, heat insulating ability and absorption property is good in fusing; the heat transfer of crystallizer surrounding evenly; lubricate, prevent bonding steel leakage again, and casting billet surface is without the defect such as pit, impurity; internal soundness is good, strand qualification rate >=99.8%.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
The present invention, through test repeatedly, determines the optimum formula of continuous crystallizer protecting slag, and in order to further improve mold flux property, the present invention carries out management and control to the raw material of covering slag, CaF in described fluorite 2be 92.0% ~ 94.0%, SiO 2≤ 5.0%, S≤0.1%; SiO in described wollastonite 2be 51.5% ~ 54.5%, CaO be 42.5% ~ 45.5%, burn tinctuer≤1.9%; Be Na in described white alkali 2cO 3>=98.0%, bulk density>=0.8g/ml; Al in described aluminium stone 2o 3be 78.0% ~ 82.0%; Described clinker is SiO 2be 19.0% ~ 23.0%, CaO be 63.0% ~ 67.0%, Al 2o 3≤ 7.0%; MgO>=90.0% in described magnesia powder, SiO 2≤ 5.0%, CaO≤5.0%; MnO>=55% in described pyrolusite, Fe 2o 3be 3 ~ 5%, SiO 2be 6.0% ~ 12.0%; SiO in described bentonite 2be 67.5% ~ 70.5%, CaO≤2.0%, Al 2o 3be 14.5% ~ 17.5%.
Embodiment 1
A kind of continuous crystallizer protecting slag, comprises the raw material of following parts by weight: 325 7 parts, order fluorites, 325 order wollastonites 55 parts; 5 parts, white alkali; 325 6 parts, order aluminium stones, 325 order clinkers 2 parts, 325 order magnesia powders 4 parts; 325 order pyrolusites 5 parts; 325 3 parts, order coke, high-carbon amorphous graphite 3 parts, carburant 8 parts; carbon black 3 parts, binding agent sodium carboxymethylcellulose 2 parts.
The preparation method of continuous crystallizer protecting slag, comprises the following steps:
(1) to prepare burden slurrying: raw material is added in pulping tank the slurrying that adds water, mixing time is 60min, obtains slip, and in pulp density and slip, the concentration of solid content is 58%;
(2) mist projection granulating: by slip granulation in plunger displacement pump pressurized delivered to mist projection granulating tower, plunger displacement pump pressure is 0.8MPa, and defeated slurry speed is 20L/min, spray sheet aperture is 2.0mm, and tower temperature is 650 DEG C;
(3) screening packaging: sieve out after particle diameter is the mist projection granulating particle of 0.15mm with vibration screen, physical index, the chemical composition of sampling testing product, packaging, warehouse-in.
The chemical composition of this continuous crystallizer protecting slag is after testing: CaO29.85%, SiO229.5%, Al2O36.2%, Na2O3.5%, F2.8%, MgO4.2%, MnO3.2%, fixed carbon 15%; Basicity 1.0, fusion temperature is 1150 DEG C, and viscosity is 0.50PaS.
Flow at certain steel mill four machine four, section 150 × 150 ㎜, pulling rate 2m/min; steel grade welding wire steel, uses this covering slag, and fusing evenly; reacting balance; spreadability is good, and flame is moderate, and slag bar is less; slag consumption is at about 0.37kg/t; after slab cooling, oscillation mark is even, without the defect such as slag inclusion, depression, and product percent of pass >=99.8%.
Embodiment 2
A kind of continuous crystallizer protecting slag, comprises the raw material of following parts by weight: 325 15 parts, order fluorites, 325 order wollastonites 35 parts; 13 parts, white alkali, 325 4 parts, order aluminium stones, 325 order clinkers 6 parts; 325 order magnesia powders 3 parts; 325 order pyrolusites 3 parts, sodium fluoride 5 parts, brium carbonate 4 parts; 325 order bentonites 5 parts; 325 4 parts, order coke, carbon black 3 parts, binding agent yellow starch gum 2 parts.
The preparation method of continuous crystallizer protecting slag, comprises the following steps:
(1) to prepare burden slurrying: raw material is added in pulping tank the slurrying that adds water, mixing time is 70min, obtains slip, and in pulp density and slip, the concentration of solid content is 60%;
(2) mist projection granulating: by slip granulation in plunger displacement pump pressurized delivered to mist projection granulating tower, plunger displacement pump pressure is 1.0MPa, and defeated slurry speed is 21L/min, spray sheet aperture is 2.0mm, and tower temperature is 660 DEG C;
(3) screening packaging: sieve out after particle diameter is the mist projection granulating particle of 0.3mm with vibration screen, physical index, the chemical composition of sampling testing product, packaging, warehouse-in.
The laboratory inspection physical and chemical index of this formula is after testing: CaO29.01%, SiO 222.2%, Al 2o 33.4%, Na 2o11.5%, F8.5%, MgO3.0%, MnO1.5%, fixed carbon 5.5%, basicity 1.31, fusion temperature 1080 DEG C, viscosity 0.10PaS.
At certain steel mill slab caster casting Q235 steel grade, section 220 × 1800mm 2use this covering slag between pulling rate 0.8-1.3m/min, ton steel consumption is 0.45 ~ 0.65kg/t steel, crystallizer liquid slag layer thickness 8 ~ 12mm.When this covering slag uses, almost without slag bar in crystallizer, flame is moderate, the performance of spreadability, heat insulating ability, melting, absorption property is good, the heat transfer of crystallizer surrounding evenly, meets the instructions for use of steel mill, has both met and has lubricated, prevent bonding steel leakage again, casting billet surface is without slag inclusion, without lobe, zero defect; Product percent of pass >=99.8%.
Embodiment 3
A kind of continuous crystallizer protecting slag, comprises the raw material of following parts by weight: 260 3.5 parts, order fluorites, 260 order wollastonites 45 parts; 11 parts, white alkali; 260 9 parts, order aluminium stones, 260 order clinkers 5 parts, 260 order magnesia powders 2 parts; 260 order pyrolusites 4 parts; 260 order bentonites 5 parts, 260 4 parts, order coke, carburant 8 parts; carbon black 2 parts, binding agent yellow starch gum and each 1 part of sodium carboxymethylcellulose.
A preparation method for continuous crystallizer protecting slag, comprises the following steps:
(1) to prepare burden slurrying: raw material is added in pulping tank the slurrying that adds water, mixing time is 62min, obtains slip, and in pulp density and slip, the concentration of solid content is 62%;
(2) mist projection granulating: by slip granulation in plunger displacement pump pressurized delivered to mist projection granulating tower, plunger displacement pump pressure is 1.2MPa, and defeated slurry speed is 22L/min, spray sheet aperture is 2.0mm, and tower temperature is 670 DEG C;
(3) screening packaging: sieve out after particle diameter is the mist projection granulating particle of 0.4mm with vibration screen, physical index, the chemical composition of sampling testing product, packaging, warehouse-in.
The laboratory inspection physical and chemical index of this formula is after testing: CaO25.5%, SiO 228.25%, Al 2o 38.3%, Na 2o6.8%, F2.5%, MgO1.3%, MnO2.5%, fixed carbon 13%, basicity 0.9, fusion temperature 1125 DEG C, viscosity 0.65PaS.
At certain steel mill circular-arc type continuous casting machine casting 380,37Mn5 steel grade, use this covering slag between pulling rate 0.4 ~ 0.6m/min, ton steel consumption is 0.4 ~ 0.5kg/t steel, crystallizer liquid slag layer thickness 8 ~ 12mm.When this covering slag uses, almost without slag bar in crystallizer, flame is moderate, spreadability, heat insulating ability, melting, good, and casting billet surface is without slag inclusion, cave in without lobe, nothing; Product percent of pass >=99.8%.
Embodiment 4
A kind of continuous crystallizer protecting slag, comprises the raw material of following parts by weight: 260 10 parts, order fluorites, 260 order wollastonites 43 parts; 15 parts, white alkali, lithium carbonate 2 parts, 260 1 part, order part magnesium powder; 260 order pyrolusites 2 parts; sodium fluoride 8, brium carbonate 5 parts, 260 order bentonites 5 parts; 260 3 parts, order coke; carburant 2 parts, carbon black 2 parts, binding agent yellow starch gum and each 0.5 part of sodium carboxymethylcellulose.
A preparation method for continuous crystallizer protecting slag, comprises the following steps:
(1) to prepare burden slurrying: raw material is added in pulping tank the slurrying that adds water, mixing time is 65min, obtains slip, and in pulp density and slip, the concentration of solid content is 64%;
(2) mist projection granulating: by slip granulation in plunger displacement pump pressurized delivered to mist projection granulating tower, plunger displacement pump pressure is 1.3MPa, and defeated slurry speed is 23L/min, spray sheet aperture is 2.0mm, and tower temperature is 680 DEG C;
(3) screening packaging: sieve out after particle diameter is the mist projection granulating particle of 0.6mm with vibration screen, physical index, the chemical composition of sampling testing product, packaging, warehouse-in.
The laboratory inspection physical and chemical index of this formula is after testing: CaO27.1%, SiO 221.8%, Al 2o 32.0%, Na 2o12.5%, F10.0%, MgO2.0%, MnO0.55%, fixed carbon 6.2%, basicity 0.95, fusion temperature 1120 DEG C, viscosity 0.12PaS.
When this covering slag uses, almost without slag bar in crystallizer, flame is moderate, spreadability, heat insulating ability, melting, good, and casting billet surface is without slag inclusion, cave in without lobe, nothing; Product percent of pass >=99.8%.
Embodiment 5
A kind of continuous crystallizer protecting slag, comprises the raw material of following parts by weight: 300 8 parts, order fluorites, 300 order wollastonites 44 parts; 10 parts, white alkali, 300 8 parts, order aluminium stones, 300 order clinkers 5 parts; 300 order magnesia powders 5 parts, 300 order pyrolusites 3 parts, sodium fluoride 2 parts; brium carbonate 3 parts, 300 order bentonites 4 parts, 300 1 part, order coke; carburant 1 part; carbon black 1 part, binding agent yellow starch gum 1 part, sodium carboxymethylcellulose 0.5 part, 3 parts, polyethylene fibre powder.
Wherein polyethylene fibre powder refers to that polyethylene fibre is 300 object powder through grinding to form fineness.
A preparation method for continuous crystallizer protecting slag, comprises the following steps:
(1) to prepare burden slurrying: raw material is added in pulping tank the slurrying that adds water, mixing time is 68min, obtains slip, and in pulp density and slip, the concentration of solid content is 65%;
(2) mist projection granulating: by slip granulation in plunger displacement pump pressurized delivered to mist projection granulating tower, plunger displacement pump pressure is 1.4MPa, and defeated slurry speed is 24L/min, spray sheet aperture is 2.0mm, and tower temperature is 690 DEG C;
(3) screening packaging: sieve out after particle diameter is the mist projection granulating particle of 0.8mm with vibration screen, physical index, the chemical composition of sampling testing product, packaging, warehouse-in.
The laboratory inspection physical and chemical index of this formula is after testing: CaO30.5%, SiO 230.1%, Al 2o 37.9%, Na 2o7.6%, F3.1%, MgO5.0%, MnO1.5%, fixed carbon 3.0%, basicity 1.0, fusion temperature 1160 DEG C, viscosity 0.72PaS.
The use amount of carbonaceous material is decreased in the present embodiment; increase a certain amount of polyethylene fibre; the consumption of carbonaceous material can be reduced on the one hand; the thickness of molten slag layer is kept to stablize; residue on the other hand after polyethylene fibre burning can prevent covering slag from forming caking or producing slag bar; improve cc billet surface quality, the covering slag of the present embodiment can be applied in square billet ultra-low-carbon steel steel grade.
When this covering slag uses, almost without slag bar in crystallizer, flame is moderate, spreadability, heat insulating ability, melting, good, and casting billet surface is without slag inclusion, cave in without lobe, nothing; Product percent of pass >=99.8%.
Embodiment 6
A kind of continuous crystallizer protecting slag, comprises the raw material of following parts by weight: 300 5 parts, order fluorites, 300 order wollastonites 50 parts; 8 parts, white alkali, 300 10 parts, order aluminium stones, 300 order clinkers 6 parts; 300 order magnesia powders 3 parts, 300 order pyrolusites 4 parts, sodium fluoride 1.5 parts; brium carbonate 2 parts, 300 order bentonites 4 parts, 300 1 part, order coke; carburant 2 parts; carbon black 1 part, binding agent yellow starch gum 1 part, sodium carboxymethylcellulose 0.5 part, 2 parts, polyacrylonitrile fibre powder.
A preparation method for continuous crystallizer protecting slag, comprises the following steps:
(1) to prepare burden slurrying: raw material is added in pulping tank the slurrying that adds water, mixing time is 70min, obtains slip, and in pulp density and slip, the concentration of solid content is 66%;
(2) mist projection granulating: by slip granulation in plunger displacement pump pressurized delivered to mist projection granulating tower, plunger displacement pump pressure is 1.5MPa, and defeated slurry speed is 25L/min, spray sheet aperture is 2.0mm, and tower temperature is 700 DEG C;
(3) screening packaging: sieve out after particle diameter is the mist projection granulating particle of 1.0mm with vibration screen, physical index, the chemical composition of sampling testing product, packaging, warehouse-in.
The laboratory inspection physical and chemical index of this formula is after testing: CaO29.1%, SiO 230.3%, Al 2o 310.1%, Na 2o4.4%, F2.0%, MgO3.1%, MnO2.4%, fixed carbon 3.9%, basicity 0.96, fusion temperature 1180 DEG C, viscosity 0.85PaS.
The use amount of carbonaceous material is decreased in the present embodiment; increase a certain amount of polyacrylonitrile fibre; the consumption of carbonaceous material can be reduced on the one hand; the thickness of molten slag layer is kept to stablize; residue on the other hand after polyacrylonitrile fibre burning can prevent covering slag from forming caking or producing slag bar; improve cc billet surface quality, the covering slag of the present embodiment can be applied in mild steel steel grade.
When this covering slag uses, almost without slag bar in crystallizer, flame is moderate, spreadability, heat insulating ability, melting, good, and casting billet surface is without slag inclusion, cave in without lobe, nothing; Product percent of pass >=99.8%.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, other amendments that those of ordinary skill in the art make technical scheme of the present invention or equivalently to replace, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.

Claims (8)

1. a continuous crystallizer protecting slag, is characterized in that, comprises the raw material of following parts by weight: 3.5 ~ 15 parts, fluorite; wollastonite 35 ~ 55 parts, 5 ~ 15 parts, white alkali, lithium carbonate 0 ~ 2 part; 0 ~ 10 part, aluminium stone, clinker 0 ~ 6 part, magnesia powder 1 ~ 5 part; pyrolusite 2 ~ 5 parts, sodium fluoride 0 ~ 8 part, brium carbonate 0 ~ 5 part; bentonite 0 ~ 5 part, 1 ~ 4 part, coke, carburant 0 ~ 8 part; carbon black 1 ~ 3 part, binding agent 1 ~ 2 part.
2. continuous crystallizer protecting slag according to claim 1, is characterized in that, CaF in described fluorite 2be 92.0% ~ 94.0%, SiO 2≤ 5.0%, S≤0.1%; SiO in described wollastonite 2be 51.5% ~ 54.5%, CaO be 42.5% ~ 45.5%, burn tinctuer≤1.9%; Be Na in described white alkali 2cO 3>=98.0%, bulk density>=0.8g/ml; Al in described aluminium stone 2o 3be 78.0% ~ 82.0%; Described clinker is SiO 2be 19.0% ~ 23.0%, CaO be 63.0% ~ 67.0%, Al 2o 3≤ 7.0%; MgO>=90.0% in described magnesia powder, SiO 2≤ 5.0%, CaO≤5.0%; MnO>=55% in described pyrolusite, Fe 2o 3be 3 ~ 5%, SiO 2be 6.0% ~ 12.0%; SiO in described bentonite 2be 67.5% ~ 70.5%, CaO≤2.0%, Al 2o 3be 14.5% ~ 17.5%.
3. continuous crystallizer protecting slag according to claim 1, is characterized in that, the fineness of described fluorite, wollastonite, aluminium stone, clinker, magnesia powder, pyrolusite, bentonite, coke is 260 ~ 325 orders.
4. continuous crystallizer protecting slag according to claim 1, is characterized in that, described binding agent is sodium carboxymethylcellulose and/or yellow starch gum.
5. continuous crystallizer protecting slag according to claim 1, is characterized in that, described covering slag comprises the chemical composition of following percentage by weight: CaO25.5 ~ 31%, SiO 221.8 ~ 30.5%, Al 2o 32 ~ 10.1%, Na 2o3.5 ~ 12.5%, MgO1 ~ 5%, F2.0 ~ 10%, MnO0.5% ~ 4.0%, fixed carbon 3 ~ 15%.
6. continuous crystallizer protecting slag according to claim 5, is characterized in that, the fusing point of described covering slag is 1080 DEG C ~ 1180 DEG C, and viscosity is 0.1 ~ 0.85PaS.
7. a preparation method for the continuous crystallizer protecting slag as described in any one of claim 1 to 6, is characterized in that, comprises the following steps:
(1) batching slurrying: raw material is added in pulping tank the slurrying that adds water, mixing time is 60 ~ 70min, obtains slip;
(2) mist projection granulating: by slip granulation in plunger displacement pump pressurized delivered to mist projection granulating tower, plunger displacement pump pressure is 0.8 ~ 1.5MPa, and defeated slurry speed is 20 ~ 25L/min, spray sheet aperture is 2.0mm, and tower temperature is 650 ~ 700 DEG C;
(3) screening packaging: sieve out after particle diameter is the mist projection granulating particle of 0.15 ~ 1mm with vibration screen, physical index, the chemical composition of sampling testing product, packaging, warehouse-in.
8. the preparation method of continuous crystallizer protecting slag according to claim 7, is characterized in that, in described step (1), pulp density is 58 ~ 66%.
CN201510886655.8A 2015-12-07 2015-12-07 Casting powder for continuous casting crystallizer and preparation method of casting powder Pending CN105328151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510886655.8A CN105328151A (en) 2015-12-07 2015-12-07 Casting powder for continuous casting crystallizer and preparation method of casting powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510886655.8A CN105328151A (en) 2015-12-07 2015-12-07 Casting powder for continuous casting crystallizer and preparation method of casting powder

Publications (1)

Publication Number Publication Date
CN105328151A true CN105328151A (en) 2016-02-17

Family

ID=55279027

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510886655.8A Pending CN105328151A (en) 2015-12-07 2015-12-07 Casting powder for continuous casting crystallizer and preparation method of casting powder

Country Status (1)

Country Link
CN (1) CN105328151A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106513606A (en) * 2016-12-30 2017-03-22 西峡龙成冶金材料有限公司 Continuous casting crystallizer covering slag special for IF steel
CN106583673A (en) * 2016-12-16 2017-04-26 河南通宇冶材集团有限公司 Continuous-casting mold flux for decreasing sticking steel breakouts and preparation method thereof
CN108838355A (en) * 2018-07-09 2018-11-20 西峡龙成冶金材料有限公司 A kind of continuous-casting crystallizer especially used covering slag of ESP low-carbon
CN108856666A (en) * 2018-07-05 2018-11-23 江苏理工学院 Stainless steel continuous casting covering slag and preparation method thereof
CN109894588A (en) * 2019-04-18 2019-06-18 洛阳市科丰冶金新材料（集团）有限公司 One kind is completely without head high efficiency continuous casting ESP mild steel mould flux and preparation method thereof
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
CN113695543A (en) * 2021-08-18 2021-11-26 中天钢铁集团有限公司 Method for controlling central shrinkage cavity of welding wire steel at high drawing speed
CN115106491A (en) * 2021-03-19 2022-09-27 宝山钢铁股份有限公司 Casting-on covering slag for continuous casting crystallizer and preparation method thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1958537A1 (en) * 1969-11-21 1971-06-24 Eitel Hans Joachim Continuous steel casting using mould - powder contng manganese oxide
GB1514185A (en) * 1976-08-05 1978-06-14 Robson Refractories Ltd Metal casting process using a flux addition
CN1152266A (en) * 1995-04-10 1997-06-18 福塞科国际有限公司 Mould fluxes for use in continuous casting of steel
CN1974062A (en) * 2006-12-22 2007-06-06 重庆大学 Crystallizer protecting cinder for continuous casting of crack sensitive steel and its prepn process
CN101214534A (en) * 2008-01-08 2008-07-09 河南通宇冶材集团有限公司 Preliminary melting type continuous casting crystallizer protecting slag and preparation thereof
CN101658907A (en) * 2009-09-16 2010-03-03 河南通宇冶材集团有限公司 Protective slag of large-profile round billet continuous-casting crystallizer and method for preparing same
CN104511580A (en) * 2013-09-30 2015-04-15 上海梅山钢铁股份有限公司 Molten steel solvent for low-carbon steel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1958537A1 (en) * 1969-11-21 1971-06-24 Eitel Hans Joachim Continuous steel casting using mould - powder contng manganese oxide
GB1514185A (en) * 1976-08-05 1978-06-14 Robson Refractories Ltd Metal casting process using a flux addition
CN1152266A (en) * 1995-04-10 1997-06-18 福塞科国际有限公司 Mould fluxes for use in continuous casting of steel
CN1974062A (en) * 2006-12-22 2007-06-06 重庆大学 Crystallizer protecting cinder for continuous casting of crack sensitive steel and its prepn process
CN101214534A (en) * 2008-01-08 2008-07-09 河南通宇冶材集团有限公司 Preliminary melting type continuous casting crystallizer protecting slag and preparation thereof
CN101658907A (en) * 2009-09-16 2010-03-03 河南通宇冶材集团有限公司 Protective slag of large-profile round billet continuous-casting crystallizer and method for preparing same
CN104511580A (en) * 2013-09-30 2015-04-15 上海梅山钢铁股份有限公司 Molten steel solvent for low-carbon steel

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
李方锦: "《科学技术百科全书（第十一卷 地质学 地球化学）》", 31 May 1985, 科学出版社 *
李锦平: "《矿物典.第三卷.第一分册.简单氧化物类矿物》", 31 January 2008, 地质出版社 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106583673A (en) * 2016-12-16 2017-04-26 河南通宇冶材集团有限公司 Continuous-casting mold flux for decreasing sticking steel breakouts and preparation method thereof
CN106583673B (en) * 2016-12-16 2019-04-26 河南通宇冶材集团有限公司 A kind of continuous casting covering slag and preparation method thereof reducing bonding steel leakage
CN106513606A (en) * 2016-12-30 2017-03-22 西峡龙成冶金材料有限公司 Continuous casting crystallizer covering slag special for IF steel
CN108856666A (en) * 2018-07-05 2018-11-23 江苏理工学院 Stainless steel continuous casting covering slag and preparation method thereof
CN108856666B (en) * 2018-07-05 2020-08-21 江苏理工学院 Continuous casting covering slag for stainless steel and preparation method thereof
CN108838355A (en) * 2018-07-09 2018-11-20 西峡龙成冶金材料有限公司 A kind of continuous-casting crystallizer especially used covering slag of ESP low-carbon
CN109894588A (en) * 2019-04-18 2019-06-18 洛阳市科丰冶金新材料（集团）有限公司 One kind is completely without head high efficiency continuous casting ESP mild steel mould flux and preparation method thereof
CN109894588B (en) * 2019-04-18 2021-06-22 洛阳市科丰冶金新材料（集团）有限公司 Special all-endless high-efficiency continuous casting protective slag for ESP (electronic stability program) low-carbon steel and preparation method thereof
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
CN115106491A (en) * 2021-03-19 2022-09-27 宝山钢铁股份有限公司 Casting-on covering slag for continuous casting crystallizer and preparation method thereof
CN115106491B (en) * 2021-03-19 2024-06-04 宝山钢铁股份有限公司 Casting mold flux for continuous casting mold and preparation method thereof
CN113695543A (en) * 2021-08-18 2021-11-26 中天钢铁集团有限公司 Method for controlling central shrinkage cavity of welding wire steel at high drawing speed

Similar Documents

Publication Publication Date Title
CN105328151A (en) Casting powder for continuous casting crystallizer and preparation method of casting powder
CN100528406C (en) Continuous casting crystallizer casting powder for weathering steel and manufacturing method thereof
CN103317111B (en) A kind of Fluoride-free mold powder for low-carbon steel
CN101658907B (en) Protective slag of large-profile round billet continuous-casting crystallizer and method for preparing same
CN101947644B (en) High-manganese high-nitrogen low-nickel stainless steel plate blank continuous casting crystallizer covering slag and preparation method thereof
CN100506433C (en) Carbon-free casting powder for casting steel making die
CN102728797A (en) Crystallizer protective slag for effectively controlling carbon steel cracks in compact strip production (CSP)
CN104226947B (en) A kind of tundish covering flux used for ultra-low-carbon steel
CN103962521B (en) Fluorine-Free Mould Fluxes used for ultra-low-carbon steel
CN104439133A (en) Novel casting powder and application thereof
CN102019384A (en) High-viscosity continuous casting protective slag for solving slag inclusion on surface of low-carbon steel
CN101214534A (en) Preliminary melting type continuous casting crystallizer protecting slag and preparation thereof
CN103785807A (en) Ultrahigh-alkalinity crystallizer mould flux special for high-pulling-rate peritectic steel
CN106513607A (en) Continuous casting crystallizer casting powder for 304 stainless steel and preparation method thereof
CN104772441A (en) Continuous casting powder for high-carbon high-alloy steel
CN102233411A (en) Low-alkalinity crystallizer covering slag prepared from building waste clay
CN109894588A (en) One kind is completely without head high efficiency continuous casting ESP mild steel mould flux and preparation method thereof
CN103909241A (en) Crystallizer casting powder for high-aluminum steel continuous casting
CN103128243A (en) High aluminum steel special continuous casting crystallizer casting powder
CN105522130A (en) Medium carbon steel chamfering copper plate continuous casting mold covering slag and preparation method thereof
CN102009142B (en) 30MnSi steel special continuous casting crystallizer functional protection material
CN101733378B (en) BaO-containing functional protective material for continuous casting crystallizer
CN106513606B (en) A kind of continuous-casting crystallizer especially used covering slag of IF steel
CN105414505A (en) Special covering slag for auto sheet CSP sheet billet
CN102019383B (en) Special functional protection material of continuous casting crystallizer for alloy tool steel

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20160217

RJ01 Rejection of invention patent application after publication