CN102719589B - Molten vanadium-titanium iron desulfurizing agent and preparation method thereof as well as desulfurization method using desulfurizing agent - Google Patents
Molten vanadium-titanium iron desulfurizing agent and preparation method thereof as well as desulfurization method using desulfurizing agent Download PDFInfo
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Abstract
The invention discloses a molten vanadium-titanium iron desulfurizing agent and a preparation method thereof as well as a desulfurization method using the desulfurizing agent. The molten vanadium-titanium iron desulfurizing agent comprises the components in percentage by weight: 62-69% of CaO, 2-9% of CaC2, 1-3.5% of CaF2, 1.5-3.5% of C, 5.5-9.5% of Mg, 1.0-3.0% of Na2CO3, and the balance of inevitable impurities. The preparation method of the molten vanadium-titanium iron desulfurizing agent comprises the steps: burdening according to the percentage by weight of the components in the molten vanadium-titanium iron desulfurizing agent, uniformly mixing, drying, grinding into powder to obtain the molten vanadium-titanium melted iron desulfurizing agent. The desulfurization method adopts a blowing method for desulfurization, and uses the molten vanadium-titanium desulfurizing agent. The molten vanadium-titanium iron desulfurizing agent can guarantee higher desulfurization rate while lower melted iron temperature (1230-1280 DEG C), is low in cost, low in unit consumption, low in temperature drop of melted iron before and after desulfurization, easy in desulfurizing slag removal and wide in application prospects.
Description
Technical field
The invention belongs to hot metal pretreatment field, more particularly, relate to a kind of vanadium-titanium-iron-water sweetening agent and preparation method thereof and the sulfur method that uses this sweetening agent.
Background technology
The sweetening agent that existing DESULPHURIZATION OF HOT METAL BY POWDER INJECTION adopts mainly contains following several: 1) lime powder sweetening agent; 2) Mg-base desulfurizing agent; 3) soda powder sweetening agent; 4) calcium carbide powder sweetening agent; 5) lime+soda; 6) lime+calcium carbonate+fluorite+carbon dust.
1) lime powder sweetening agent: adopt nitrogen to do carrier gas and inserts bottom hot metal ladle CaO powder is sprayed by spray gun.CaO powder proportion is lighter, and in molten iron, ascent rate is very fast; Simultaneously, (CaS) generating easily crust not yet reacts its inside just to float in slag, both caused CaO powder consumption very large, cause desulfurization slag viscosity and hot metal temperature drop all very large simultaneously, can form very soon solid-state dry slag, the difficulty that makes to skim strengthens, and in slag, a large amount of band iron causes iron loss higher, seldom adopts at present.
2) Mg-base desulfurizing agent: magnesium is one of the strongest sweetening agent, and consumption is few, to molten iron with blast furnace slag insensitive, irrelevant because of slag and desulphurization reaction, the quantity of slag of generation is few, so iron loss is few.Magnesium desulfurizer mainly contains magnesium powder and magnesium grain, the common < 1mm of granularity of magnesium powder, and spontaneous ignition temperature is 500～600 ℃; The granularity of magnesium grain is 0.5-2mm, is by centrifuging, to make after magnesium fusing, and layer protecting film has been wrapped up on surface, activated carbon content > 85%, and spontaneous ignition temperature is 700～800 ℃.The shortcoming of magnesium desulfurizer is owing to having residual magnesium in molten iron, causes part magnesium loss, at high temperature because the vapour pressure of magnesium is too high, is difficult to control, and sometimes makes the desulfuration efficiency of magnesium reduce; While carrying out desulfurization processing with magnesium, dark hot metal ladle for palpus, be beneficial to guarantee plug in the rifle degree of depth; Also to avoid in addition magnesium to meet the wet danger that produces.But this is the current more DESULPHURIZATION OF HOT METAL BY POWDER INJECTION processing mode of application, but all there is the desulfurization degree larger problem that fluctuates owing to being subject to that hot metal ladle capacity and desulfurization slag are difficult for removing and waiting to affect ，Ge producer.
3) soda powder sweetening agent: soda powder (Na
2cO
3) there is very strong sweetening power, in the time of 1350 ℃, with soda powder, carry out external desulfurization of hot metal, approximately large 10 times than the sweetening power of CaO, approach CaC
2sweetening power.Common Na
2cO
3the gases such as the CO2 that decomposition generates and CO can be strengthened the stirring to iron liquid, promote the raising of desulfuration efficiency.But, Na
2cO
3easily evaporation generates a large amount of smog, these smog pollution air, and blocking pipe, aggravation is corroded, simultaneously Na in slag
2o content is high, and it is very rare that slag becomes, serious to refractory corrosions such as cylinder-packings, in addition Na
2cO
3source shortage, cost is high, thereby is in use subject to larger restriction, and various countries all seldom use Na at present
2cO
3the sweetening agent of base carries out secondary desulfurization.
4) calcium carbide powder sweetening agent: calcium carbide powder desulphurization reaction is to carry out on the interface of solid calcium carbide powder and liquid molten iron.Highly purified calcium carbide powder particle surface can form loose porous CaS layer, the sulphur in molten iron can be easily through this layer and with the CaC of internal layer
2proceed chemical reaction.But the calcium carbide that actual production is used is containing w (CaC
2the industrial calcium carbide of)=50%～80%, also contains w (CaO)=16%～40%, generates the skull of CaS after the sulphur in CaO absorption molten iron, makes sweetening process blocked.Therefore, while making sweetening agent with calcium carbide powder, the restricted link of desulfurization is the diffusion of sulphur in molten iron one side interlayer, and sulphur is diffused as its restricted link in liquid phase.Add strong mixing, reduce calcium carbide powder particle diameter, keep high molten iron temperature etc. can improve the utilization ratio of calcium carbide powder.
5) lime+soda: soda powder is fully mixed with lime powder, proportioning is (8～9): (1～2), so not only improve the mobility of desulfurization slag, supplement the deficiency of calcium oxide content in lime, improve the sweetening power of lime, and given full play to the effect of soda, reduced the evaporation of soda, improve desulfurization condition, improved desulfurization degree.
6) lime+calcium carbonate+fluorite+carbon dust: take CaO CO after calcium carbonate decomposes in main quaternary system sweetening agent
2gas can make molten metal boiling, increases the gas content in slag, improves the mobility of slag, increases the interfacial area of iron liquid and sweetening agent, has promoted desulphurization reaction.CaF
2after being heated, form the mobility that granular can fine raising sweetening agent slag, improve the desulfurization degree of lime.But the 3rd to the 6th kind of technique all requires molten iron to have higher temperature condition, and larger according to the de-S agent proportioning difference of the actual state ，Ge factory of molten iron.
Vanadium-titanium-iron-water and common hot metal ratio are, except having any different, chemical composition (is mainly the composition difference of S, V, Ti), another significant difference is exactly that the temperature of vanadium-titanium-iron-water is obviously low than common molten iron, this is because must adopt low silicon titanium (low furnace temperature) operation policy during smelting vanadium-titanium magnetite by blast furnace, thereby the tapping temperature of vanadium-titanium-iron-water is low during than the refining of common mining and metallurgy, in general, the medial temperature of vanadium-titanium-iron-water is 1230～1330 ℃, on average lower approximately 60～130 ℃ than common molten iron.Blast-melted temperature is lower, and sulphur content is higher, and reason is that the temperature in State of Blast Furnace is the key factor that affects desulfurization kinetics condition.In addition, molten iron pretreatment desulfurizing reaction is thermo-negative reaction, so temperature is higher, more favourable to desulfurization; Temperature is lower, and desulphurization reaction is more not easy to carry out.Therefore, the desulfurization intractability of the vanadium-titanium-iron-water of lower temperature is larger.
The temperature of the vanadium-titanium-iron-water that certain factory produces is obviously on the low side, the temperature fluctuation interval of vanadium-titanium-iron-water is 1236～1311 ℃, only approximately 1262 ℃ of medial temperatures, molten iron temperature is the situation (accounting for 78%) often occurring lower than 1280 ℃, so having tried out existing multiple sweetening agent, to carry out the effect of blowing desulfurization all undesirable, average desulfurization degree is approximately 49.2% (fluctuating 30.1～75.6%) only, can not meet the production requirement of low-sulfur steel at all, seriously restricted the direct motion of STEELMAKING PRODUCTION.
Summary of the invention
For the deficiencies in the prior art, one of object of the present invention is to solve the one or more problems that exist in above-mentioned prior art.
The object of the present invention is to provide a kind of at molten iron temperature compared with under low condition, hot metal pretreatment still can reach the low temperature vanadium-titanium-iron-water sweetening agent of better sweetening effectiveness, and the sulfur method of the preparation method of this vanadium-titanium-iron-water sweetening agent and this vanadium-titanium-iron-water sweetening agent of use.
To achieve these goals, an aspect of of the present present invention provides a kind of vanadium-titanium-iron-water sweetening agent, and in described vanadium-titanium-iron-water sweetening agent, the weight percent of each composition is: CaO 62～69%, CaC
22～9%, CaF
21～3.5%, C 1.5～3.5%, Mg 5.5～9.5%, Na
2cO
31.0～3.0%, all the other are inevitable impurity.
According to vanadium-titanium-iron-water sweetening agent of the present invention embodiment, described vanadium-titanium-iron-water sweetening agent is Powdered, and particle diameter is 0.12～0.18mm.
Another aspect of the present invention provides a kind of preparation method of vanadium-titanium-iron-water sweetening agent, according to the weight percent of each composition in above-mentioned vanadium-titanium-iron-water sweetening agent, prepares burden, and grind into powder after mixing, being dried, obtains vanadium-titanium-iron-water sweetening agent.
According to the preparation method of vanadium-titanium-iron-water sweetening agent of the present invention embodiment, described starting material comprise: containing the quickened lime of CaO>=85%, its S≤0.10%, activity degree>=310mol/ml; The passivated magnesium of TMg>=85%; Containing CaC
2>=75% calcium carbide; Containing CaF
2>=75% fluorite; Graphite or charcoal containing C>=90%; The Na of total alkali content>=96%, muriate≤1.5%
2cO
3.
According to the preparation method of vanadium-titanium-iron-water sweetening agent of the present invention embodiment, the particle diameter of gained vanadium-titanium-iron-water sweetening agent is 0.12～0.18mm.
According to the preparation method of vanadium-titanium-iron-water sweetening agent of the present invention embodiment, described preparation method also comprises the step that gained vanadium-titanium-iron-water sweetening agent is sealed to pack.
One side more of the present invention provides a kind of sulfur method, adopts blowing process to carry out desulfurization, and described sulfur method adopts above-mentioned vanadium-titanium-iron-water sweetening agent to carry out desulfurization to vanadium-titanium-iron-water.
According to sulfur method of the present invention embodiment, using rare gas element as carrying powder gas, described vanadium-titanium-iron-water sweetening agent is sprayed into vanadium-titanium-iron-water by spray gun, wherein, helping wind drift amount is 15～25Nm
3/ h, fluidization flow are 15～20Nm
3/ h, jetting pressure are that 0.4～0.6MPa, injecting velocity be 46～55kg/min, spray gun are 150～300mm apart from height at the bottom of tank.
Vanadium-titanium-iron-water sweetening agent of the present invention still has higher desulfurization degree in the time of can guaranteeing molten iron temperature lower (temperature is 1230～1280 ℃), cost is lower, unit consumption is few and the molten iron cooling of desulfurization front and back is few, desulfurization slag is easily skimmed, and has solved sweetening agent of the prior art poor problem of sweetening effectiveness under low temperature vanadium-titanium-iron-water state.Meanwhile, vanadium-titanium-iron-water sweetening agent of the present invention can guarantee that molten iron also has good sweetening effectiveness when comparatively high temps (temperature >=1280 ℃), has broad application prospects.
Embodiment
Below vanadium-titanium-iron-water sweetening agent of the present invention and preparation method thereof and the sulfur method of this sweetening agent of use are described in detail.
For the concrete feature of low temperature vanadium-titanium-iron-water, vanadium-titanium-iron-water sweetening agent of the present invention carries out the design of sweetening agent according to following effect requirements: the average band quantity of slag of (1) vanadium-titanium-iron-water is larger, needs to consider the impact of blast furnace slag on desulfurization; (2) sweetening agent will also need to have stronger sweetening power in low-temperature molten iron environment; (3) desulfurization slag of vanadium-titanium-iron-water should be skimmed than being easier to; (4) cost of sweetening agent is low, unit consumption is few and the hot metal temperature drop of de-S front and back is little.
According to above-mentioned requirements, in vanadium-titanium-iron-water sweetening agent of the present invention, the weight percent of each composition is: CaO 62～69%, CaC
22～9%, CaF
21～3.5%, C 1.5～3.5%, Mg 5.5～9.5%, Na
2cO
31.0～3.0%, all the other are inevitable impurity.Thus obtained vanadium-titanium-iron-water sweetening agent has sweetening power stronger under low temperature, easily skims, low cost and other advantages.The present invention has suitably reduced CaO under cold condition, CaC and Na
2cO
3content (because these several materials can not well bring into play sweetening power under cold condition, and make the hot metal temperature drop larger), suitably increased the Mg content that sweetening power is strong and temperature loss is little, can make sweetening process temperature drop little, cost is low and sweetening effectiveness is obvious simultaneously.
Wherein, lime (CaO) aboundresources, low price.And sweetening process is thermo-negative reaction, unit consumption is high, hot metal temperature drop is large, therefore the amount of allocating into of CaO is unsuitable excessive.From aspects such as cost and temperature drops, consider, for the desulfurization requirement of low temperature vanadium-titanium-iron-water, allocate 62～69% CaO into and both can reach good stably desulphurizing effect, can reduce again the comprehensive cost of sweetening agent.
The sweetening power of Mg is strong, and hot metal temperature drop is little, and Mg and the CaO desulfurization of can mutually promoting, and plays the effect of deep desulfuration.If but Mg allocates into too much, desulphurization reaction is more violent, easily causes molten iron to turn over greatly, and the cost of Mg is higher, so in conjunction with the particular case of low temperature vanadium-titanium-iron-water, allocate 5.5～9.0% Mg effect into best.
CaC
2sweetening power be greater than CaO, can make up the CaO amount of allocating into unsettled shortcoming of sweetening effectiveness when lower, play the effect of deep desulfuration.But CaC
2be high energy consumption product, and very easily absorb water and affect sweetening effectiveness, therefore allocate 2～9% into.
CaF
2as reaction promotor, add CaF
2itself does not play desulfidation, but because its fusing point is low, can the effect of plaing slag, and suitable proportioning is 1～3.5%, and the amount of allocating into is impactization slag effect more at least, and the amount of allocating into affects more again hot metal ladle life-span contaminate environment.
The main lubricate of C, is conducive to granulated slag material flowing in pipeline, and C can be provided by graphite or charcoal etc.
Na
2cO
3also be as reaction promotor.Due to Na
2cO
3decompose and produce CO
2and Na
2o, CO
2gas can increase mixing effect, Na
2the sweetening power of O is strong approximately 10 times compared with CaO, can promote desulphurization reaction.But Na
2cO
3be decomposed into thermo-negative reaction, the amount of allocating into must be depending on the temperature of molten iron, molten iron temperature higher (for example temperature > is 1300 ℃), the amount of allocating into can suitably improve; Molten iron temperature is lower, and the amount of allocating into must strictly be controlled, otherwise can have a negative impact to desulfurization, allocates 1.0～3.0% effects into best.
In addition, vanadium-titanium-iron-water sweetening agent of the present invention also comprises that impurity is as SiO
2, Al
2o
3deng, these impurity can not produce considerable influence to sweetening effectiveness, but actual production process unavoidably can be brought above impurity into.
In order to increase the contact area of sweetening agent and molten iron and to improve sweetening effectiveness, vanadium-titanium-iron-water sweetening agent of the present invention is preferably Powdered, and particle diameter is 0.12～0.18mm.
The preparation method of vanadium-titanium-iron-water sweetening agent of the present invention prepares burden according to the weight percent of each composition in above-mentioned vanadium-titanium-iron-water sweetening agent, and grind into powder after mixing, being dried, obtains vanadium-titanium-iron-water sweetening agent.Particularly, above-mentioned starting material comprise: containing the quickened lime of CaO>=85%, its S≤0.10%, activity degree>=310mol/ml, wherein, the activity degree of lime refer to it in slag with the response capacity of other material, the burn-off rate with lime in slag represents; The passivated magnesium of TMg (that is, whole magnesium simple substance content)>=85%; Containing CaC
2>=75% calcium carbide; Containing CaF
2>=75% fluorite; Graphite or charcoal containing C>=90%; The Na of total alkali content>=96%, muriate≤1.5%
2cO
3, the raw-material resource of vanadium-titanium-iron-water sweetening agent of the present invention be easy to get and composite price lower.During grinding, dried mixed raw material is ground to form to the Powdered finished product that particle diameter is 0.12～0.18mm.In addition, preparation method of the present invention also comprises the step that gained vanadium-titanium-iron-water sweetening agent is sealed to pack, for example, by 50Kg/ bag, pack.
Sulfur method of the present invention is to adopt blowing process to carry out desulfurization, and the sweetening agent using adopts above-mentioned vanadium-titanium-iron-water sweetening agent.Particularly, using rare gas element as carrying powder gas, for example nitrogen or argon gas, but the cost of nitrogen is minimum, and above-mentioned vanadium-titanium-iron-water sweetening agent is sprayed in vanadium-titanium-iron-water tank vanadium-titanium-iron-water is processed by spray gun, and wherein, helping wind drift amount is 15～25Nm
3/ h, fluidization flow are 15～20Nm
3/ h, jetting pressure are that 0.40～0.60MPa, injecting velocity be 46～55kg/min, spray gun are 150～300mm apart from height at the bottom of tank, wherein, help wind drift amount to refer to just start to guarantee unobstructed air blowing flow, fluidization flow is the control flow while normally jetting, jetting pressure refers to the pressure of feed bin, and injecting velocity refers to the consumption of sweetening agent in the unit time.And, when winding-up vanadium-titanium-iron-water sweetening agent, should keep stable injecting velocity, prevent spray gun obstruction or serious splash phenomenon.In addition, according to sulphur contents different in vanadium-titanium-iron-water, the present invention gives concrete sweetening agent unit consumption, and specifically referring to table 1, as shown in Table 1, even if sulphur content is higher, vanadium-titanium-iron-water sweetening agent unit consumption of the present invention is also lower, is conducive to the saving of cost.
The vanadium-titanium-iron-water sweetening agent unit consumption that table 1 vanadium-titanium-iron-water sulphur content is corresponding
| Vanadium-titanium-iron-water sulphur content (%) | Vanadium-titanium-iron-water sweetening agent unit consumption |
| ＜0.050 | 2.5Kg/ ton iron |
| 0.050～0.060 | 2.5～3.5Kg/ ton iron |
| 0.060～0.070 | 3.5～4.5Kg/ ton iron |
| 0.070～0.080 | 4.5～5.5Kg/ ton iron |
| ＞0.080 | 5.5～6.5Kg/ ton iron |
The vanadium-titanium-iron-water of certain factory of table 2 adopts the sweetening effectiveness situation of different sweetening agents
The vanadium-titanium-iron-water that table 2 is listed Liao Mou factory adopts the sweetening effectiveness situation of different sweetening agents.As shown in Table 2, the proportioning of vanadium-titanium-iron-water sweetening agent of the present invention can meet molten iron good sweetening effectiveness when comparatively high temps (temperature >=1280 ℃), can guarantee that again molten iron still has good sweetening effectiveness under lesser temps (temperature is 1230～1280 ℃) condition, has solved sweetening agent of the prior art poor problem of sweetening effectiveness under low-temperature molten iron state.
Vanadium-titanium-iron-water sweetening agent of the present invention can guarantee to still have when molten iron temperature is lower higher desulfurization degree.When vanadium-titanium-iron-water temperature is 1230～1280 ℃, powder injection desulphurization rate is 60～85%, average out to 69.1%; When vanadium-titanium-iron-water temperature >=1280 ℃, powder injection desulphurization rate is 80～95%, average out to 85.6%, and this efficiently solves the molten iron requirement that low-sulfur steel is produced in converter.In addition, the material in vanadium-titanium-iron-water sweetening agent formula of the present invention is easy to get, and sweetening agent cost is lower, temperature drop is less before and after desulfurizing iron, and the vanadium-titanium-iron-water that table 3 is listed Liao Mou factory adopts temperature and the cost situation of different sweetening agents.
The vanadium-titanium-iron-water of certain factory of table 3 adopts temperature and the cost situation of different sweetening agents
Below by specific embodiment, vanadium-titanium-iron-water sweetening agent of the present invention and preparation method thereof and the sulfur method of this sweetening agent of use are described.
Embodiment mono-: composition proportion and the sweetening effectiveness of A group vanadium-titanium-iron-water sweetening agent
(1) raw-material major ingredient: lime: CaO=85.7%, activity degree=320mol/ml; Passivated magnesium: TMg=86.1%; Calcium carbide: CaC
2=77.2%; Fluorite: CaF
2=79%; Carbon dust: C=93.4%; Soda: Na
2cO
3=96.3.
(2) preparation process: lime, passivated magnesium, calcium carbide, fluorite, carbon dust, soda in above-mentioned starting material 81%, 10%, 3.8%, 2.0%, 1.7%, 1.5% are prepared burden by weight percentage, after mixing, being dried, grind the powder into about 0.15mm, make A group vanadium-titanium-iron-water sweetening agent as shown in table 4.
The composition table (wt%) of table 4 A group vanadium-titanium-iron-water sweetening agent
| CaO | CaC 2 | CaF 2 | C | Mg | Na 2CO 3 | P | S |
| 68.2 | 2.7 | 1.29 | 1.57 | 9.03 | 1.21 | 0.014 | 0.07 |
(3) the de-S process of winding-up: using nitrogen as carrying powder gas, above-mentioned sweetening agent is sprayed in vanadium-titanium-iron-water tank vanadium-titanium-iron-water is processed by spray gun, wherein, helping wind drift amount is 22Nm
3/ h, fluidization flow are 18Nm
3/ h, jetting pressure are that 0.52MPa, injecting velocity are 51kg/min, spray gun apart from the about 230mm of height at the bottom of tank.
(4) concrete desulfurization parameter and sweetening effectiveness in Table 5, table 6:
The sweetening effectiveness of table 5 embodiment 1
The sweetening effectiveness of table 6 embodiment 1
Embodiment bis-: composition proportion and the sweetening effectiveness of B group vanadium-titanium-iron-water sweetening agent
(1) raw-material major ingredient: lime: CaO=86.2%, activity degree=323mol/ml; Passivated magnesium: TMg=85.8%; Calcium carbide: CaC
2=75.9%; Fluorite: CaF
2=77.1%; Carbon dust: C=92.5%; Soda: Na
2cO
3=96.2.
(2) preparation process: lime, passivated magnesium, calcium carbide, fluorite, carbon dust, soda in above-mentioned starting material 74.1%, 7%, 9.0%, 4.0%, 3.3%, 2.6% are prepared burden by weight percentage, after mixing, being dried, grind the powder into about 0.15mm, make de-S agent as shown in table 7.
The composition table (wt%) of table 7 B group vanadium-titanium-iron-water sweetening agent
| CaO | CaC 2 | CaF 2 | C | Mg | Na 2CO 3 | P | S |
| 62.7 | 8.7 | 3.29 | 3.1 | 5.83 | 2.71 | 0.012 | 0.067 |
(3) the de-S process of winding-up: using nitrogen as carrying powder gas, above-mentioned sweetening agent is sprayed in vanadium-titanium-iron-water tank vanadium-titanium-iron-water is processed by spray gun, wherein, helping wind drift amount is 21Nm
3/ h, fluidization flow are 18Nm
3/ h, jetting pressure are that 0.52MPa, injecting velocity are 50kg/min, spray gun apart from the about 230mm of height at the bottom of tank.
(4) concrete desulfurization parameter and sweetening effectiveness in Table 8, table 9:
The sweetening effectiveness of table 8 embodiment 2
The sweetening effectiveness of table 9 embodiment 2
Embodiment bis-: composition proportion and the sweetening effectiveness of C group vanadium-titanium-iron-water sweetening agent
(1) raw-material major ingredient: lime: CaO=85.7%, activity degree=331mol/ml; Passivated magnesium: TMg=86.5%; Calcium carbide: CaC
2=76.8%; Fluorite: CaF
2=76.4%; Carbon dust: C=93.5%; Soda: Na
2cO
3=96.7.
(2) preparation process: lime, passivated magnesium, calcium carbide, fluorite, carbon dust, soda in above-mentioned starting material 78%, 8.5%, 6.0%, 3.0%, 2.5%, 2.0% are prepared burden by weight percentage, after mixing, being dried, grind the powder into about 0.14mm, make de-S agent as shown in table 10.
The composition table (wt%) of table 10 C group vanadium-titanium-iron-water sweetening agent
| CaO | CaC 2 | CaF 2 | C | Mg | Na 2CO 3 | P | S |
| 65.7 | 5.9 | 2.41 | 2.3 | 7.84 | 2.04 | 0.014 | 0.069 |
(3) the de-S process of winding-up: using nitrogen as carrying powder gas, above-mentioned sweetening agent is sprayed in vanadium-titanium-iron-water tank vanadium-titanium-iron-water is processed by spray gun, wherein, helping wind drift amount is that 22.1Nm3/h, fluidization flow are that 18.4Nm3/h, jetting pressure are that 0.53MPa, injecting velocity are 50.5kg/min, spray gun apart from the about 220mm of height at the bottom of tank.
(4) concrete desulfurization parameter and sweetening effectiveness in Table 11, table 12:
The sweetening effectiveness of table 11 embodiment 3
The sweetening effectiveness of table 12 embodiment 3
Desulfurization result from above-described embodiment, vanadium-titanium-iron-water sweetening agent of the present invention all has good sweetening effectiveness under high temperature liquid iron or low-temperature molten iron, and consumption is few, temperature drop is less after desulfurizing iron, and desulfurization slag is group on molten iron surface cotton-shaped, dragveyer is easy to skim the slag after desulfurization, avoided returning sulphur because dragging for the converter steelmaking process that slag weak effect causes, met the production requirement of low-sulfur kind steel completely.
In sum, vanadium-titanium-iron-water sweetening agent of the present invention still has higher desulfurization degree in the time of can guaranteeing molten iron temperature lower (temperature is 1230～1280 ℃), cost is lower, unit consumption is few and the molten iron cooling of desulfurization front and back is few, desulfurization slag is easily skimmed, and has solved sweetening agent of the prior art poor problem of sweetening effectiveness under low temperature vanadium-titanium-iron-water state.Meanwhile, vanadium-titanium-iron-water sweetening agent of the present invention can guarantee that molten iron also has good sweetening effectiveness when comparatively high temps (temperature >=1280 ℃), has broad application prospects.
Although specifically described vanadium-titanium-iron-water sweetening agent of the present invention and preparation method thereof and the sulfur method that uses this sweetening agent, but those skilled in the art will be appreciated that, without departing from the spirit and scope of the present invention, can make various forms of changes to the present invention.
Claims (8)
1. a vanadium-titanium-iron-water sweetening agent, is characterized in that, in described vanadium-titanium-iron-water sweetening agent, the weight percent of each composition is: CaO62～69%, CaC
22～9%, CaF
21～3.5%, C1.5～3.5%, Mg5.5～9.5%, Na
2cO
31.0～2.71%, all the other are inevitable impurity.
2. vanadium-titanium-iron-water sweetening agent according to claim 1, is characterized in that, described vanadium-titanium-iron-water sweetening agent is Powdered, and particle diameter is 0.12～0.18mm.
3. a preparation method for vanadium-titanium-iron-water sweetening agent, is characterized in that, according to the weight percent of each composition in vanadium-titanium-iron-water sweetening agent described in claim 1, prepares burden, and grind into powder after mixing, being dried, obtains vanadium-titanium-iron-water sweetening agent.
4. the preparation method of vanadium-titanium-iron-water sweetening agent according to claim 3, is characterized in that, batching raw materials comprises: containing the quickened lime of CaO>=85%, its S≤0.10%, activity degree>=310mol/ml; The passivated magnesium of TMg>=85%; Containing CaC
2>=75% calcium carbide; Containing CaF
2>=75% fluorite; Graphite or charcoal containing C>=90%; The Na of total alkali content>=96%, muriate≤1.5%
2cO
3.
5. the preparation method of vanadium-titanium-iron-water sweetening agent according to claim 3, is characterized in that, the particle diameter of gained vanadium-titanium-iron-water sweetening agent is 0.12～0.18mm.
6. the preparation method of vanadium-titanium-iron-water sweetening agent according to claim 3, is characterized in that, described preparation method also comprises the step that gained vanadium-titanium-iron-water sweetening agent is sealed to pack.
7. a sulfur method, adopts blowing process to carry out desulfurization, it is characterized in that, described sulfur method adopts the vanadium-titanium-iron-water sweetening agent described in claim 1 or 2 to carry out desulfurization to vanadium-titanium-iron-water.
8. sulfur method according to claim 7, is characterized in that, usings rare gas element as carrying powder gas, and described vanadium-titanium-iron-water sweetening agent is sprayed into vanadium-titanium-iron-water by spray gun, and wherein, helping wind drift amount is 15～25Nm
3/ h, fluidization flow are 15～20Nm
3/ h, jetting pressure are that 0.40～0.60MPa, injecting velocity be 46～55kg/min, spray gun are 150～300mm apart from height at the bottom of tank.
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| CN103627850B (en) * | 2013-11-27 | 2015-08-26 | 攀钢集团研究院有限公司 | Hot metal containing V-Ti desulphurization slag modifier and preparation method thereof and desulfurization Slag modification method |
| CN106755699A (en) * | 2016-11-28 | 2017-05-31 | 北京首钢股份有限公司 | A kind of composite desulfurizing agent and singly-blowing magnesium grain composite desulfuration method for molten iron |
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| CN108504821A (en) * | 2018-05-23 | 2018-09-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-titanium-iron-water composite desulfurizing agent and its preparation and application |
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| CN100436604C (en) * | 2006-02-27 | 2008-11-26 | 沈阳东北大学冶金技术研究所 | Passivated composite desulfurizing powder and preparing method |
| CN101358265B (en) * | 2008-07-05 | 2011-02-09 | 攀枝花市东攀工贸有限责任公司 | Compound iron melt desulfurizing agent and method of preparing the same |
| CN101586175B (en) * | 2009-06-26 | 2010-09-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Low magnesium type molten iron/semisteel desulfurizing agent and preparation method thereof |
| CN101586176A (en) * | 2009-06-26 | 2009-11-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Calcium based molten iron/semisteel desulfurizing agent and preparation method thereof |
| CN102031396B (en) * | 2009-09-27 | 2012-05-30 | 攀钢集团钢铁钒钛股份有限公司 | Method for extracting vanadium from molten iron |
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