CN102242251A - Alkaline V-Ti pellet and preparation method thereof - Google Patents
Alkaline V-Ti pellet and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a method for preparing an alkaline V-Ti pellet by using high-Ti-type V-Ti magnetite concentrate. The method comprises the steps of batching, mixing, drying, damp milling, pelletizing, drying, preheating, roasting, cooling, sieving and the like. According to the preparation method, a pelletizing raw material is mainly based on V-Ti magnetite concentrate, partial common concentrate is added, and a slaked lime alkaline flux is added, so that the finished pellet is prepared by roasting. By using the preparation method, the V-Ti magnetite concentrate with the common concentrate and the alkaline flux is used in any proportion so as to produce alkaline pellet with an alkalinity of 0.4-1.0, thereby achieving the purpose of transferring alkaline agglomerate to the pellet; and then pelletizing and roasting are carried out, so as to obtain the V-Ti pellet, wherein the compression strength per V-Ti pellet is larger than 2500N, thus the adaptability and smelting property of the raw materials are improved.
Description
Technical field
The invention belongs to metallurgical technology field, relate in particular to a kind of alkaline vanadium titanium globe ore deposit and adopt high-Ti type V-Ti magnetite concentrate with addition of not containing TiO
2Common iron ore concentrate, and add the slaked lime basic flux and prepare the method in alkaline vanadium titanium globe ore deposit.
Background technology
Pellet has excellent mechanical intensity and metallurgical performance, has become a kind of important high-quality furnace refractory.Using more general burden structure at present is " high basicity sinter+acidic oxidation pellet ".Commerical test shows, along with the increase of pellet ratio, and the corresponding 2.4-2.5 that brings up to of the basicity of agglomerate.SINTERING PRODUCTION shows, when sintering basicity surpasses 2.4, and the refinement of agglomerate finished product grade, the intensity variation is bigger to the blast-furnace smelting influence.Therefore, strict restriction is answered in the basicity requirement of pellet, can not increase substantially sinter basicity and come balance blast furnace slag basicity.Influential in view of ultra-high basicity vanadium titanium agglomerate to quality, be necessary agglomerate part basicity is shifted to pellet, produce alkaline pellet.
Japan is the country that early start is produced the fluxed pellets ore deposit, but it is the fine that adds CaO or MgO in iron ore concentrate before making ball, and pelletizing basicity is controlled between the 0.4-1.2, and pelletizing reductibility and reduction swellability performance are improved.
Patent documentation CN200510032097.5 discloses the method that a kind of v-ti magnetite concentrate prepares acidic pellet ore, and this method adopts vanadium ilmenite concentrate+common concentrate, adds the binding agent wilkinite again and prepares acid pellet.But the limitation of this method also is obvious, and promptly the wilkinite that is increased can only be produced acid pellet.Must produce alkaline pelletizing for the part basicity of agglomerate is transferred to pellet, therefore, use that this method prepares alkaline pelletizing or just there is tangible limitation in the schreyerite pelletizing.
Summary of the invention
The objective of the invention is in order to overcome existing above-mentioned technical problem in existing vanadium titanium globe ore deposit and the preparation, and provide a kind of v-ti magnetite concentrate with addition of common iron ore concentrate, and adding the formulated alkaline vanadium titanium globe ore deposit of slaked lime basic flux, the present invention adopts following two kinds of technical schemes to finish its task.
Alkaline vanadium titanium globe of the present invention ore deposit is made up of following in weight %: select v-ti magnetite concentrate 1-99% for use, common concentrate 1-99% adds slaked lime 0.8-3.2%, and pellet basicity is 0.4-1.0; Wherein common concentrate is not for containing TiO
2Iron ore concentrate.
Alkaline vanadium titanium globe ore deposit preparation method's of the present invention characteristics are, adopt v-ti magnetite concentrate, the 1-99% of 1-99% common concentrate, add the slaked lime of 0.8-3.2%, and adopt following steps to prepare alkaline vanadium titanium globe ore deposit: A, batching, mixing, drying; B, profit mill; C, make ball; D, drying, preheating, roasting; E, cooling, screening; Wherein common concentrate is not for containing TiO
2Iron ore concentrate.Its preparation process is as follows:
A, batching, mixing, drying: adopt v-ti magnetite concentrate, the 1-99% of 1-99% common concentrate, add the slaked lime of 0.8-3.2%, mix and dry, wherein, be dried to mixture moisture and reduce to 6-8%, pellet basicity is 0.4-1.0;
B, profit mill: the compound profit of A step is milled to＜200 order grain size contents reach 70-90%;
C, make ball: make the ball process and add suitable quantity of water, the green-ball moisture controlled is made ball time 10-30min at 8-10.5%, green-ball granularity 10-25mm;
D, drying, preheating, roasting: drying temperature 200-300 ℃; Preheating temperature 800-1000 ℃, preheating 10-25min; Maturing temperature is 1100-1300 ℃, roasting time 25-40min;
E, cooling, screening: the roasting pelletizing is cooled off, sieves and obtain the finished ball nodulizing that granularity is 9-18mm.
The component content of v-ti magnetite concentrate of the present invention is counted with weight %: Fe
2O
3: 40-50%, FeO 29-33%, SiO
22.5-4.5%, CaO 1.5-2.2%, MgO 2.0-3.2%, Al
2O
33.0-4.5%, V
2O
50.5-0.65%, TiO
210-15%, S: P≤0.003%≤0.6%,; Wherein TFe52-56% is Fe in the ore
2O
3Total amount with the ferro element of FeO.
The TiO of the present invention's alkalescence vanadium titanium finished ball nodulizing
2Content is 6.5-9.0%, the preferred 0.4-0.6 of pellet basicity, and the ultimate compression strength of pellet is greater than 2500N/.
Use the alkaline vanadium titanium globe ore deposit of the present invention's preparation, the wide accommodation of raw material, particularly solve v-ti magnetite concentrate and made the big problem of pellet difficulty, alkaline vanadium titanium globe of the present invention ore deposit can be satisfied with fully and be used for blast-furnace smelting, guarantees that technico-economical comparisones such as its utilization coefficient, coke ratio all are improved.
Embodiment
Below with reference to design philosophy of the present invention, specific embodiment and comparative example, the good result that elaborates preparation method of the present invention and produced.
Alkaline vanadium titanium globe ore deposit preparation method of the present invention may further comprise the steps: batching, mixing, drying, and the profit mill is made ball, drying, preheating, roasting, cooling, screening; Can carry out blast-furnace smelting after the screening.
Pellet raw material of the present invention is based on v-ti magnetite concentrate that Flos Bombacis Malabarici is produced, adopt the common concentrate of v-ti magnetite concentrate, the 1-99% of 1-99%, again with addition of the slaked lime basic flux of 0.8-3.2% etc. make ball, roasting prepares the finished product pellet.The component content of v-ti magnetite concentrate is counted with weight %: Fe
2O
3: 40-50%, FeO 29-33%, SiO
22.5-4.5%, CaO 1.5-2.2%, MgO 2.0-3.2%, Al
2O
33.0-4.5%, V
2O
50.5-0.65%, TiO
210-15%, S: P≤0.003%≤0.6%,; Wherein TFe52-56% is Fe in the ore
2O
3Total amount with the ferro element of FeO.
Because Flos Bombacis Malabarici v-ti magnetite concentrate TiO
2With Al
2O
3The content height, its fusing point is up to more than 1350 ℃, and the amount of liquid phase of generation is few, lacks 10-20% than common ore deposit sintering amount of liquid phase, and this kind granularity of concentrate is thick, and＜200 purpose grain size contents have only about 50%, and balling property is poor, cause mixture ventilation poor, vertical sintering speed is slow, and the agglomerate yield and quality is low.Under reducing atmosphere, (, adding coke powder or hard coal in sintering improve sintering temperature because of acting as a fuel, when improving sintering temperature, supervene reducing atmosphere) when sintering temperature is lower than 1300 ℃, can produce the sintered material infusibility, amount of liquid phase is few, the serious consequence that descends of sinter strength and yield rate.Therefore, in order to overcome the defective of v-ti magnetite concentrate on sintering, making pellet with v-ti magnetite concentrate will be the another kind of important approach that utilizes, and can produce the quality pellets ore deposit of satisfying blast-furnace smelting, and its metallurgical performance is better than agglomerate.
[1] pelletizing basicity.Pellet basicity is natural alkalinity (not with addition of any basic flux) substantially in the world at present, and the present invention adds the slaked lime of 0.8-3.2% as basic flux production mixing ore deposit pelletizing, with pellet basicity (CaO/SiO
2) be controlled at and all can produce qualified vanadium titanium globe ore deposit within the 0.4-1.0.
[2] the present invention can prepare burden and makes ball with addition of the common iron ore concentrate of arbitrary proportion with the v-ti magnetite concentrate of arbitrary proportion, and then roasting, obtains alkaline vanadium titanium globe ore deposit.
[3] the v-ti magnetite concentrate batching adopts the disk proportioning machine, and slaked lime adopts screw feeder+star-shaped feeding machine batching, but is not limited only to this two kinds of equipment.
[4] the preparation pelletizing need adopt binding agent.Binding agent of the present invention is to use slaked lime, and slaked lime is that basic flux can improve basicity, is again binding agent, improves the adhesive property of concentrate.In preparation process, add the slaked lime basic flux of 0.8-3.2%: preferably use proportioning to be 0.8-2.5%, with adhesiveproperties that improves v-ti magnetite concentrate and the alkalescence of regulating the vanadium titanium globe ore deposit.
[5] the said ratio raw material is mixed-drying.The moisture of compound fluctuates in the 9-13.5% scope, enters mixing machine after preparing burden and mixes-drying, and dry required thermal source is the heat that blast furnace gas+the coke-oven gas burning produces, and mixture moisture is reduced to 6-8%.
[6] above-mentioned compound is implemented the profit grinding process.V-ti magnetite concentrate＜200 order grain size contents generally have only 40-60%, and the granularity of making pellet generally needs 80-90%, therefore compound is through after the dry mixed, enter damp mill, carry out ore grinding, increase fine fraction content, behind the ore grinding＜200 order grain size contents can reach 70-90%, can satisfy and make the ball needs.Grinding procedure adopts damp mill.The Flos Bombacis Malabarici v-ti magnetite concentrate is produced part higher-grade v-ti magnetite concentrate, its granularity is thinner, for example the v-ti magnetite concentrate of 56% iron grade＜200 order grades can reach more than 80%, and making ball with this concentrate does not just need the profit mill, also can cancel profit grinder preface on the flow process.
[7] make the ball system.Balling equipment adopts balling disc.Compound is made ball after grinding by the mixing profit in balling disc, make the ball process and add water in right amount, profit grinder preface mixture moisture 6-8% is advisable before making ball, and the green-ball moisture controlled is at 8-10.5%, and preferably adequate moisture 9.0%, making the ball time is 10-30min, green-ball granularity 10-25mm.
[8] drying-preheating-roasting system.Through the green-ball behind the mixed pelletizing, through super-dry-preheating-roasting series reaction and processing, green-ball is fixed through high temperature oxidation, obtains finished ball.200-300 ℃ of its drying temperature, preheating temperature are 800-1000 ℃, and be 10-25min warm up time, and maturing temperature is 1100-1300 ℃, and roasting time is 25-40min.
This process can adopt grate kiln, also can adopt shaft furnace, must not make sweeping generalizations.
[9] the roasting ball is cooled off, screening and the finished ball that obtains having certain ultimate compression strength and metallurgical performance and granularity, finished ball granularity 9-18mm is more than mean compressive strength 2500N/ is individual.
Embodiment 1
At first in prepared in laboratory alkaline vanadium titanium globe, for comparative analysis, prepared simultaneously that to add wilkinite be the acid pellet of binding agent.
Table 1 material chemical component/%
| Material name | TFe | Fe 2O 3 | FeO | SiO 2 | CaO | MgO | Al 2O 3 | S | P | Scaling loss |
| Common concentrate | 63.25 | 61.38 | 26.12 | 5.47 | 1.23 | 0.90 | 1.00 | 0.324 | 0.035 | -0.90 |
| V-ti magnetite concentrate | 55.56 | 46.39 | 29.72 | 3.35 | 1.92 | 2.56 | 3.31 | 0.341 | 0.007 | -1.5 |
| Unslaked lime | 88.00 | 1.00 | 0.5 | 0.4 | 0.008 | 0.011 | 10 |
V in the v-ti magnetite concentrate
2O
50.65%, TiO
211.16%.
Table 2 wilkinite physicochemical property and chemical ingredients
Table 3 raw material granularity is formed
Test raw material is mainly v-ti magnetite concentrate, common iron ore concentrate, unslaked lime and wilkinite.The test desired raw material is taken from different production scenes: v-ti magnetite concentrate, common iron ore concentrate and wilkinite are all taken from and are climbed pelletizing plant of steel enterprise-like corporation, and unslaked lime is from climbing steel iron work sintering mill (plant).Various material chemical components see Table 1, and the wilkinite physical and chemical index sees Table 2, and vanadium ilmenite concentrate and common granularity of concentrate composition see Table 3.Join the ore deposit scheme and see Table 4.
Table 4 proportion scheme (%)
| Join the ore deposit structure | Batch | Basicity | The vanadium ilmenite concentrate | Common concentrate | Slaked lime | Wilkinite |
| Vanadium ilmenite concentrate+common concentrate | JH | 0.15 | 70 | 30 | 1.80 | |
| Vanadium ilmenite concentrate+common concentrate | Hx4 | 0.4 | 70 | 30 | 0.80 | |
| Vanadium ilmenite concentrate+common concentrate | Hx6 | 0.6 | 70 | 30 | 1.60 | |
| Vanadium ilmenite concentrate+common concentrate | Hx8 | 0.8 | 70 | 30 | 2.50 |
The amount of allocating into of slaked lime is by unslaked lime, and Hx4 in the numbering, Hx6, Hx8 represent that basicity is 0.4,0.6,0.8.
Table 5 roasting system
Get iron-bearing material 5kg according to the experiment mix proportion scheme, adopt the outer flux (unslaked lime adds water digestion and adds the back fully) of joining, behind artificial mixing, at Φ 800 * 165mm (limit height), rotating speed is that 23r/min, inclination angle are to make ball in 46 the balling disc, make in the ball process to adopt and manually add water, making the ball time is 30min.Make ball gained green-ball after drying under the environment about 110 ℃, carry out roasting, and the pelletizing after the roasting is carried out the mensuration of ultimate compression strength and reduction swellability coefficient etc. by roasting system (table 5).
Test item: (1) finished ball ultimate compression strength.(2) pelletizing reduction swellability coefficient:＜900 ℃ of logical N
2Protection, the 900 o'clock logical protection of continuation N
2Half hour, close N subsequently
2, feed reducing gas, reduced reducing gas flow: 15L/min 1 hour.(3) metallurgical performance: the reducing gas that low-temperature reduction disintegration can be measured consists of CO30%+N
270%, get less than the weight percentage of 3.15mm grade and make cryogenic reducting powder index (RDI
-315); In warm reducing property measure and undertaken by GB13244-91, reducing gas consists of CO30%+N
270%, the reduction degree when getting 180min is reductibility index (RI).(4) main thing phase of pellet and content thereof: detect pelletizing mineral composition and form pattern, mineral structure etc.(5) comprehensive furnace charge performance: sample and coke size are 10-12.5mm, the reducing gas flow: reducing gas composition: 30%CO+70%N
2Heat-up rate: during room temperature to 900 ℃, be 10 ℃/min; In the time of 900-1000 ℃, be 3 ℃/min; When temperature＞1000 ℃, be 6 ℃/min; Sample is logical N before 900 ℃
2Protection heats up, and feeds the reducing gas reduction after 900 ℃; Loading: 35kg.
The laboratory test performance
1, the ultimate compression strength/N/ of different basicity pelletizings is individual under the different roasting system conditions
The most important technical indicator of finished ball nodulizing is a ultimate compression strength, and it is qualified to be considered as according to actual ultimate compression strength 2500N/ of production.Maturing temperature is controlled at more than 1230 ℃, and the finished ball nodulizing of basicity 0.6 is more with practical value.Table 6 is the feasible parameters combination of different basicity pelletizing ultimate compression strength.Can find out from table 6, the experiment that the present invention carries out in the different basicity scopes under different roasting system conditions, its ultimate compression strength has all surpassed 3000N/, the experiment effect highly significant.
The feasible parameters combination of the different basicity pelletizing of table 6 ultimate compression strength
2, pelletizing metallurgical performance
The experiment pelletizing is carried out metallurgical performance detect, after adding certain alkaline material, the pelletizing coefficient of expansion, low temperature reduction degradation index and middle temperature reduction degree compare with benchmark that all great changes have taken place.See Table 7,8,9.
(1) low temperature reduction degradation index
Table 7 pellet low temperature reduction degradation index (%)
Along with the raising of basicity, the pelletizing low temperature reduction degradation index rises.But which kind of pelletizing no matter, its low temperature reduction degradation index far below the low temperature reduction degradation index (20-30%) of vanadium titanium agglomerate, that is to say that all pelletizing reduction and pulverization ratio performance can not have influence on the normal smelting of blast furnace.
(2) warm reduction degree in
Warm reduction degree (%) in table 8 pellet
Along with the raising of basicity, warm reduction degree rises in the pellet, and after adding alkaline material, warm reduction degree all is better than the benchmark pelletizing in the pelletizing.
(3) reduction swellability coefficient
The reduction swellability coefficient and the basicity relation of pelletizing see Table 9 behind the interpolation alkaline material.Wherein the reduction swellability coefficient of JH is 8.25%.
Table 9 pellet ore reduction swellability index/%
Mixing ore deposit pelletizing reduction swellability coefficient descends with the basicity raising.Rise with basicity, the increase of silicic acid salt face helps alleviating reduction swellability.This shows that the optimum alkalinity that mixes pellet is at 0.4-0.6.
Embodiment 2
Present embodiment is the alkaline vanadium titanium globe ore deposit of actual industrial production.Employed v-ti magnetite concentrate and common iron ore concentrate composition see Table 10.
Table 10 material composition (%)
| Material name | TFe | Fe 2O 3 | FeO | SiO 2 | CaO | MgO | Al 2O 3 | V 2O 5 | TiO 2 | S | P |
| The vanadium ilmenite concentrate | 56.79 | 48.9 | 29.0 | 3.01 | 2.05 | 2.32 | 3.21 | 0.65 | 10.5 | 0.42 | 0.002 |
| Common concentrate | 63.25 | 61.38 | 26.12 | 5.47 | 1.23 | 0.90 | 1.00 | 0.324 | 0.035 |
Main equipment is a grate kiln, produces qualified pellet through preparing burden, mix, make operations such as ball, preheating-roasting.
A, with the component content raw material of above-mentioned table 10, with 0.85% add that slaked lime mixes and dry, dry pack moisture to 7.0%, detecting its natural alkalinity is 0.42;
Compound to＜200 order grain size contents of B, profit mill A step reach 85%;
C, add suitable quantity of water and make ball, 9%, making the ball time is 20min with the green-ball moisture controlled, makes the green-ball granularity be controlled at 10-25mm;
D, green-ball is carried out drying, drying temperature adopts 300 ℃, adopts 900 ℃ of preheating temperature 20min before roasting, then green-ball is carried out roasting, 1250 ℃ of maturing temperatures, roasting time 30min;
E, at last the roasting pelletizing is cooled off and sieve, obtaining granularity is the alkaline V-Ti-magnetite finished pellet of 9-18mm, after testing, the tumbler index of this pelletizing is 90.03%, ultimate compression strength is 2760N/, and wear-resistant index 5.91%, blast furnace use the pelletizing smelting of present embodiment normally to carry out.
Embodiment 3
Present embodiment sees Table 11 at v-ti magnetite concentrate and the common iron ore concentrate composition of producing alkalescence full vanadium titanium globe ore deposit use.
Table 11 material composition (%)
| Material name | TFe | Fe 2O 3 | FeO | SiO 2 | CaO | MgO | Al 2O 3 | V 2O 5 | TiO 2 | S | P |
| The vanadium ilmenite concentrate | 56.79 | 48.9 | 29.0 | 3.01 | 2.05 | 2.32 | 3.21 | 0.65 | 10.5 | 0.42 | 0.002 |
| Common concentrate | 63.25 | 61.38 | 26.12 | 5.47 | 1.23 | 0.90 | 1.00 | 0.39 | 0.035 |
Main equipment is a grate kiln, produces qualified pellet through preparing burden, mix, make operations such as ball, preheating-roasting.
A, with the component content raw material of above-mentioned table 13, with 1.7% add that slaked lime mixes and dry, dry pack moisture to 7.0%, detecting its natural alkalinity is 0.65;
Compound to＜200 order grain size contents of B, profit mill A step reach 85%;
C, add suitable quantity of water and make ball, 9%, making the ball time is 20min with the green-ball moisture controlled, makes the green-ball granularity be controlled at 10-25mm;
D, green-ball is carried out drying, drying temperature adopts 300 ℃, adopts 900 ℃ of preheating temperature 20min before roasting, then green-ball is carried out roasting, 1250 ℃ of maturing temperatures, roasting time 30min;
E, at last the roasting pelletizing is cooled off and sieve, obtaining granularity is the alkaline schreyerite finished pellet of 9-18mm, after testing, the tumbler index of this pelletizing is 91.23%, ultimate compression strength is 2880N/, and wear-resistant index 5.62%, blast furnace use the pelletizing smelting of present embodiment normally to carry out.
Embodiment 4
Employed v-ti magnetite concentrate of present embodiment and common iron ore concentrate composition see Table 12.
Table 12 material composition (%)
| Material name | TFe | Fe 2O 3 | FeO | SiO 2 | CaO | MgO | Al 2O 3 | V 2O 5 | TiO 2 | S | P |
| The vanadium ilmenite concentrate | 56.79 | 48.9 | 29.0 | 3.01 | 2.05 | 2.32 | 3.21 | 0.65 | 10.5 | 0.42 | 0.002 |
| Common concentrate | 63.25 | 61.38 | 26.12 | 5.47 | 1.23 | 0.90 | 1.00 | 0.39 | 0.035 |
Main equipment is a grate kiln, produces qualified pellet through preparing burden, mix, make operations such as ball, preheating-roasting.
A, with the component content raw material of above-mentioned table 12, with 2.5% add that slaked lime mixes and dry, dry pack moisture to 7.0%, detecting its natural alkalinity is 0.81;
Compound to＜200 order grain size contents of B, profit mill A step reach 85%;
C, add suitable quantity of water and make ball, 9.0%, making the ball time is 20min with the green-ball moisture controlled, makes the green-ball granularity be controlled at 10-25mm;
D, green-ball is carried out drying, drying temperature adopts 300 ℃, adopts 900 ℃ of preheating temperature 20min before roasting, then green-ball is carried out roasting, 1250 ℃ of maturing temperatures, roasting time 30min;
E, at last the roasting pelletizing is cooled off and sieve, obtaining granularity is the alkaline schreyerite finished pellet of 9-18mm, after testing, the tumbler index of this pelletizing is 89.91%, ultimate compression strength is 2715N/, and it is normal that wear-resistant index 5.96%, blast furnace use the pelletizing of present embodiment to smelt.
Claims (7)
1. alkaline vanadium titanium globe ore deposit, it is characterized in that, this pellet by v-ti magnetite concentrate with addition of common concentrate, it is formulated to add the slaked lime basic flux, % counts with weight: v-ti magnetite concentrate 1-99%, common concentrate 1-99% adds slaked lime 0.8-3.2%, and pellet basicity is 0.4-1.0; Wherein common concentrate is not for containing TiO
2Iron ore concentrate.
2. according to the described pellet of claim 1, it is characterized in that the component content of described v-ti magnetite concentrate is counted with weight %: Fe
2O
3: 40-50%, FeO 29-33%, SiO
22.5-4.5%, CaO 1.5-2.2%, MgO 2.0-3.2%, Al
2O
33.0-4.5%, V
2O
50.5-0.65%, TiO
210-15%, S: P≤0.003%≤0.6%,; Wherein TFe52-56% is Fe in the ore
2O
3Total amount with the ferro element of FeO.
3. according to the described pellet of claim 1, it is characterized in that the TiO in described alkaline vanadium titanium globe ore deposit
2Content is 6.5-9.0%.
4. according to the described pellet of claim 1, it is characterized in that described pellet basicity is preferably 0.4-0.6.
5. according to the described pellet of claim 1, it is characterized in that the ultimate compression strength in described vanadium titanium globe ore deposit is greater than 2500N/.
6. the preparation method in an alkaline vanadium titanium globe ore deposit, it is characterized in that, adopt v-ti magnetite concentrate, the 1-99% of 1-99% common concentrate, add the slaked lime of 0.8-3.2%, and adopt following steps to prepare alkaline vanadium titanium globe ore deposit: A, batching, mixing, drying; B, profit mill; C, make ball; D, drying, preheating, roasting; E, cooling, screening; Wherein common concentrate is not for containing TiO
2Iron ore concentrate.
7. preparation method according to claim 6 is characterized in that described:
A, batching, mixing, drying: adopt v-ti magnetite concentrate, the 1-99% of 1-99% common concentrate, add the slaked lime of 0.8-3.2%, mix and dry, wherein, be dried to mixture moisture and reduce to 6-8%, pelletizing basicity is 0.4-1.0;
B, profit mill: the compound profit of A step is milled to＜200 order grain size contents reach 70-90%;
C, make ball: make the ball process and add suitable quantity of water, the green-ball moisture controlled is made ball time 10-30min at 8-10.5%, green-ball granularity 10-25mm;
D, drying, preheating, roasting: drying temperature 200-300 ℃; Preheating temperature 800-1000 ℃, preheating 10-25min; Maturing temperature is 1100-1300 ℃, roasting time 25-40min;
E, cooling, screening: the roasting pelletizing is cooled off, sieves and obtain the finished ball nodulizing that granularity is 9-18mm.
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| CN110724774A (en) * | 2019-09-26 | 2020-01-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting vanadium-titanium magnetite concentrate in blast furnace |
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