CN111961842A - Taihe vanadium-titanium pellet and production method thereof - Google Patents
Taihe vanadium-titanium pellet and production method thereof Download PDFInfo
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- CN111961842A CN111961842A CN202010911364.0A CN202010911364A CN111961842A CN 111961842 A CN111961842 A CN 111961842A CN 202010911364 A CN202010911364 A CN 202010911364A CN 111961842 A CN111961842 A CN 111961842A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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Abstract
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to Taihe vanadium-titanium pellets and a production method thereof. The invention aims to solve the technical problem of providing Taihe vanadium-titanium pellets and a production method thereof, wherein the production method comprises the following steps: according to the weight percentage, 50-90% of Taihe concentrate, 10-50% of ultrafine-grained vanadium-titanium magnetite concentrate and 2.0-2.5% of binder of the total weight of the concentrate are uniformly mixed and pelletized to obtain green pellets, and the Taihe vanadium-titanium pellets are obtained after drying, preheating, roasting and cooling of the green pellets. The Taihe vanadium-titanium pellet prepared by the method has uniform granularity and high compressive strength.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to Taihe vanadium-titanium pellets and a production method thereof.
Background
The Taihe mining area is located in the northwest direction of the Xichang city, and the straight distance is 12km, which belongs to the Taihe town administration of the Xichang city. After the mining area is subjected to detailed exploration, the accumulated and proven reserves are 8.9 hundred million tons, and the industrial reserves are 2.79 hundred million tons, so that the vanadium-titanium magnetite deposit is an extra-large vanadium-titanium magnetite deposit. At present, the annual output of Taihe mine is 80 ten thousand tons, the TFe is about 55 percent, and TiO2The content is about 12.5 percent, V2O5The content is about 0.55 percent, and belongs to high-titanium type vanadium-titanium magnetite concentrate. The ore is mainly used in the Xichang steel vanadium sintering plant at present, but because the grain size composition is poor and the titanium content is high, perovskite is formed in the sintering process, the ore return rate of the sintered ore is high, and the processing cost is high. When the concentrate is used for producing high-titanium vanadium-titanium pellets, the particle size is coarse (about 60 percent of the particle size of the concentrate with a particle size of-200 meshes), and TiO is used2The content is high, so that the using amount of the binder is greatly increased in the green ball manufacturing process, and the requirement on the roasting temperature is high (the roasting temperature is 1280 ℃) so as to meet the requirement of entering the blast furnace.
Because the geographical position of steel climbing is poor, the logistics cost of imported ore and domestic high-powder transportation to steel climbing is high, and the iron-making cost is obviously increased after the high-powder transportation is used in large quantities. Therefore, the invention provides Taihe vanadium-titanium pellet and a production mode thereof, and achieves the purpose of improving the quality of the pellet without reducing the vanadium-titanium ore proportion in the pellet.
Disclosure of Invention
The invention provides a Taihe vanadium-titanium pellet and a production method thereof, which adopt Taihe concentrate with general granularity and vanadium-titanium magnetite concentrate with extremely fine granularity as main raw materials, and the pellet obtained has the advantages of oxidation, consolidation, high strength and uniform granularity.
The invention provides a production method of Taihe vanadium-titanium pellets, which comprises the following steps: according to the weight percentage, 50-90% of Taihe concentrate, 10-50% of ultrafine-grained vanadium-titanium magnetite concentrate and 2.0-2.5% of binder of the total weight of the concentrate are uniformly mixed and pelletized to obtain green pellets, and the Taihe vanadium-titanium pellets are obtained after drying, preheating, roasting and cooling of the green pellets.
Preferably, in the production method of the taihe vanadium-titanium pellet, the taihe concentrate is 60-70% and the superfine-particle-grade vanadium-titanium magnetite concentrate is 30-40%.
Specifically, in the production method of taihe vanadium-titanium pellets, the particle size of taihe concentrate is as follows: 7-10% of grain size larger than 0.15mm, 25-30% of grain size not larger than 0.074mm and not larger than 0.15mm, 20-23% of grain size not larger than 0.045mm and not larger than 0.074mm, 60-65% of grain size not larger than 0.074mm and 40-45% of grain size not larger than 0.045 mm.
Further, in the production method of taihe vanadium-titanium pellets, the taihe concentrate mainly comprises the following components: TFe 54.60% -55.5 wt%, FeO>30.5wt％，SiO2 3.70％～3.90wt％，TiO2 11.00％～11.50wt％，V2O5 0.61％～0.63％。
Specifically, in the production method of taihe vanadium-titanium pellets, the particle size of the ultrafine-grained vanadium-titanium magnetite concentrate is as follows: the grain size is more than 0.15mm and less than 1%, the grain size is more than or equal to 0.074mm and less than or equal to 0.15mm and less than 7% -10%, the grain size is more than or equal to 0.045mm and less than 0.074mm and less than 15% -20%, the grain size is more than or equal to 0.074mm and more than 90%, and the grain size is more than or equal to 0.045mm and less than 65% -70%.
Further, in the production method of taihe vanadium-titanium pellets, the ultrafine-grained vanadium-titanium magnetite concentrate mainly comprises the following components: TFe 56.0-56.5 wt%, FeO>33wt％，SiO2 3.40％～3.60wt％，TiO2 9.80％～10.20wt％，V2O5 0.71％～0.73wt％。
Specifically, in the production method of taihe vanadium-titanium pellets, the ultrafine-grained vanadium-titanium magnetite concentrate is a four-step ground white horse concentrate.
In the production method of the taihe vanadium-titanium pellet, the binder is bentonite.
In the production method of the Taihe vanadium-titanium pellet, the drying temperature is 200-250 ℃. The drying time is 1.5 to 2.0 hours.
In the production method of the Taihe vanadium-titanium pellet, the preheating temperature is 800-850 ℃. The preheating time is 15-25 min. Preferably, the preheating time is 800 ℃. The preheating time is 20 min.
In the production method of the Taihe vanadium-titanium pellet, the roasting temperature is 1200-1300 ℃. The roasting time is 30-50 min. Preferably, the firing temperature is 1250 ℃. The calcination time was 35 min.
In the production method of the Taihe vanadium-titanium pellet, a disc pelletizer is adopted for pelletizing. Furthermore, the disc pelletizer is a disc pelletizer with the diameter of 1000 multiplied by 350mm, the rotating speed of 20-25 r/min and the inclination angle of 40-50 degrees.
In the production method of the Taihe vanadium-titanium pellet, the water content of the green pellet is 7.5-9.5%.
In the production method of the Taihe vanadium-titanium pellet, the particle size of the green pellet is 8-16 mm, the falling strength of the green pellet is more than 4 times per pellet (0.5m), and the compressive strength of the green pellet is more than 10N per pellet.
In the production method of the Taihe vanadium-titanium pellet, the granularity of the Taihe vanadium-titanium pellet is 8-16 mm, and the compressive strength of the Taihe vanadium-titanium pellet is greater than 2000N.
The invention also provides the Taihe vanadium-titanium pellet prepared by the production method of the Taihe vanadium-titanium pellet.
The invention prepares the pellet by adding the vanadium-titanium magnetite concentrate with extremely fine granularity and the taihe concentrate with poor pelletizing granularity as the common raw materials, and the fine-grained vanadium-titanium magnetite is filled between the taihe concentrate with coarser granularity, thereby being beneficial to the intercrystalline consolidation mechanism of iron oxide during high-temperature roasting and leading the two to be connected into Fe2O3The crystal whisker is used for oxidizing and consolidating the vanadium-titanium magnetite concentrate so as to obtain cooked balls with high strength and uniform granularity, so that the compressive strength of the Taihe vanadium-titanium pellet ore is improved, and the requirement of charging the blast furnace is met; meanwhile, the vanadium titano-magnetite has the advantages of fine granularity and relatively large specific surface area, can reduce the proportion of the binder, and can improve the compressive strength of the pellet under the condition of the same proportion of the binder. In addition, after the vanadium-titanium magnetite ore is added, the iron-containing grade and the vanadium content of the pellet ore can be improved, and the blast furnace slag amount is reduced; meanwhile, as both the steel is climbing to produce the vanadium-titanium concentrate by self, the vanadium-titanium concentrate does not influence the ratio of the vanadium-titanium ore used by the blast furnace after being added.
Detailed Description
The production method of Taihe vanadium-titanium pellets comprises the following steps:
(1) preparing materials: weighing 50-90% of Taihe concentrate, 10-50% of ultrafine grain grade vanadium-titanium magnetite concentrate and industrial bentonite which accounts for 2.0-2.5% of the total weight of the two concentrates;
(2) mixing: putting the materials into a powerful mixer to be uniformly mixed to obtain a uniform mixture;
(3) pelletizing: pelletizing the mixture to obtain green pellets;
(4) and (3) drying: drying the green pellets at the temperature of 200-250 ℃ for 1.5-2.0 hours;
(5) preheating and roasting: preheating and roasting the dried green pellets in sequence; wherein the preheating temperature is 800-850 ℃, and the preheating time is 15-25 min; the roasting temperature is 1200-1300 ℃, and the roasting time is 30-50 min;
(6) and (3) cooling: and after roasting, taking out the pellet and putting the pellet in a natural environment with good ventilation condition for cooling to obtain a cooked pellet, namely the Taihe vanadium-titanium pellet.
In the method, the particle size of the Taihe concentrate can be obtained by a conventional mineral separation process (three-stage grinding separation). The grain size of the adopted superfine-grain vanadium-titanium magnetite concentrate can be obtained only after a grinding and selecting process (fourth-order grinding and selecting) is added on the basis of the conventional ore selecting process (third-order grinding and selecting). The four-step grinding and selecting is only to add one grinding and selecting process compared with the three-step grinding and selecting, and the grinding and selecting process is a conventional step.
In the method of the invention, Taihe and white horses are both place names.
In order that the invention may be better understood, the invention will now be further described with reference to the following examples.
TABLE 1 particle size distribution (wt%)
| >0.15mm | 0.15-0.074mm | 0.074-0.045mm | <0.074mm | <0.045mm | |
| Taihe concentrate | 7.03 | 28.26 | 21.06 | 64.71 | 43.65 |
| Ultrafine fraction of white horse vanadium titanium concentrate | 0.53 | 8.65 | 20.7 | 90.82 | 70.12 |
The physical and chemical indexes of the materials used in table 1 are as follows:
taihe concentrate comprises the following main components: w (TFe) 54.60% -55.5%, w (FeO)>30.5％，w(SiO2)3.70％～3.90％，w(TiO2)11.00％～11.50％，w(V2O5)0.61％～0.63％；
The main components of the ultrafine fraction of the white horse vanadium-titanium concentrate are as follows: w (TFe) 56.0% -56.5%, w (FeO)>33％，w(SiO2)3.40％～3.60％，w(TiO2)9.80％～10.20％，w(V2O5)0.71％～0.73％。
TABLE 2 raw material mixing ratio (wt%)
| Basic example | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Taihe concentrate | 100 | 90 | 80 | 70 | 60 | 50 |
| Ultrafine fraction of white horse vanadium titanium concentrate | 0 | 10 | 20 | 30 | 40 | 50 |
| Bentonite (external fittings) | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 |
According to the proportion shown in Table 2, firstly, two kinds of vanadium-titanium concentrates are put into an oven to be dried, the temperature is set to be 150 ℃, the drying time is 2 hours, and then Taihe concentrates, ultrafine-grained white horse vanadium-titanium concentrates and bentonite are added into a strong mixer to be fully mixed for 5 minutes. Adding the uniformly mixed mixture into a disc pelletizer to pelletize, controlling the water content to be 8-9%, wherein the disc pelletizer has the diameter of 1000X 350mm, the rotating speed of 20r/min and the inclination angle of 48 degrees. Producing green balls with the pellet size fraction of 8-16 mm, and detecting the falling strength and the compressive strength of the green balls, wherein the falling strength is detected by increasing the height of the green balls to 0.5m, then freely falling the green balls onto an iron plate, and counting the damage of the green balls falling for several times as the falling times; the compression strength detection method is to directly put the green ball into compression equipment for detection. The ratio of the weight of the produced green pellets to the weight of the added disc pelletizer is calculated and used as the yield of the titanium concentrate green pellets, and for the convenience of comparison and understanding of the technical effect of the invention, the green pellet comparison indexes of the examples 1, 2, 3, 4 and 5 are specifically given below.
Basic example
The weight percentage of the raw materials is as follows: 100% of Taihe concentrate, 2% of bentonite externally added, 8.5% of green pellet water content, 8min of pelletizing in a disc pelletizer, 10.58N/green pellet compressive strength detection, 3.9 times/green pellet falling strength detection and 86.30% of green pellet pelletizing rate.
Putting green balls into a drying oven for drying at the drying temperature of 200 ℃ for 2h, then transferring the green balls into a high-temperature roasting oven for preheating and roasting, cooling the completely roasted green balls for 6h, detecting the compressive strength and chemical components after complete cooling, and obtaining the result: 1994N/piece of compressive strength, 53.34 percent of TFe and TiO2Content 10.66%, V2O5The content is 0.603%.
Example 1
The weight percentage of the raw materials is as follows: 90% of Taihe concentrate, 10% of ultrafine-grained white-horse vanadium-titanium concentrate, 2% of externally-matched bentonite, 8.5% of green pellet water content control, pelletizing in a disc pelletizer, wherein the pelletizing time is 8min, the compression strength of the green pellets is detected to be 11.27N/pellet, the falling strength is detected to be 4.1 times/pellet, and the pelletizing rate of the green pellets is 87.55%.
Putting green balls into a drying oven for drying at the drying temperature of 200 ℃ for 2h, then transferring the green balls into a high-temperature roasting oven for preheating and roasting, cooling the completely roasted green balls for 6h, detecting the compressive strength and chemical components after complete cooling, and obtaining the result: 2245N/piece of compressive strength, 53.46 percent of TFe and TiO2Content 10.59%, V2O5The content is 0.614%.
Example 2
The weight percentage of the raw materials is as follows: 80% of Taihe concentrate, 20% of ultrafine-grained white-horse vanadium-titanium concentrate, 2% of externally-prepared bentonite, 8.5% of green pellet water content control, pelletizing in a disc pelletizer, wherein the pelletizing time is 8min, the compression strength of the green pellets is detected to be 11.86N/pellet, the falling strength is detected to be 4.3 times/pellet, and the pelletizing rate of the green pellets is 89.12%.
Putting green balls into a drying oven for drying at the drying temperature of 200 ℃ for 2h, then transferring the green balls into a high-temperature roasting oven for preheating and roasting, cooling the completely roasted green balls for 6h, detecting the compressive strength and chemical components after complete cooling, and obtaining the result: 2404N compressive strength, 53.57% TFe content and TiO2Content 10.52%, V2O5The content is 0.624%.
Example 3
The weight percentage of the raw materials is as follows: 70% of Taihe concentrate, 30% of ultrafine-grained white-horse vanadium-titanium concentrate, 2% of externally-prepared bentonite, 8.5% of green pellet water content control, pelletizing in a disc pelletizer, wherein the pelletizing time is 8min, the compression strength of green pellets is detected to be 12.38N/green pellet, the falling strength is detected to be 4.4 times/green pellet, and the pelletizing rate of the green pellets is 90.95%.
Putting green balls into a drying oven for drying at the drying temperature of 200 ℃ for 2h, then transferring the green balls into a high-temperature roasting oven for preheating and roasting, cooling the completely roasted green balls for 6h, detecting the compressive strength and chemical components after complete cooling, and obtaining the result: compressive strength of 2511N/piece, TFe content of 53.69%, TiO2Content 10.44%, V2O5The content is 0.635%.
Example 4
The weight percentage of the raw materials is as follows: 60% of Taihe concentrate, 40% of ultrafine-grained white-horse vanadium-titanium concentrate, 2% of externally-matched bentonite, 8.5% of green pellet water content control, pelletizing in a disc pelletizer, wherein the pelletizing time is 8min, the compression strength of green pellets is detected to be 12.41N/green pellet, the falling strength is detected to be 4.4 times/green pellet, and the pelletizing rate of the green pellets is 91.34%.
Putting green balls into a drying oven for drying at the drying temperature of 200 ℃ for 2h, then transferring the green balls into a high-temperature roasting oven for preheating and roasting, cooling the completely roasted green balls for 6h, detecting the compressive strength and chemical components after complete cooling, and obtaining the result: compressive strength of 2587N/piece, TFe content of 53.80 percent and TiO2Content 10.37%, V2O5Content 0.646％。
Example 5
The weight percentage of the raw materials is as follows: 50% of Taihe concentrate, 50% of ultrafine-grained white-horse vanadium-titanium concentrate and 2% of externally-matched bentonite, controlling the moisture of green pellets to be 8.5%, pelletizing in a disc pelletizer, wherein the pelletizing time is 8min, the compression strength of the green pellets is detected to be 11.41N/green pellet, the falling strength is detected to be 4.2 times/green pellet, and the pelletizing rate of the green pellets is 91.01%.
Putting green balls into a drying oven for drying at the drying temperature of 200 ℃ for 2h, then transferring the green balls into a high-temperature roasting oven for preheating and roasting, cooling the completely roasted green balls for 6h, detecting the compressive strength and chemical components after complete cooling, and obtaining the result: 2376N/piece of compressive strength, 53.92% of TFe content and TiO2Content 10.29%, V2O5The content is 0.656%.
From example 5, it can be seen that, with the further improvement of the proportion of the ultrafine-grained white horse vanadium-titanium concentrate, the compressive strength of green pellets, the drop strength and the compressive strength of cooked pellets are all obviously reduced compared with example 4, which indicates that the more the ultrafine-grained white horse vanadium-titanium concentrate is not added in the pellet-making process of the Taihe pellet ore, the better the granularity, and the optimal proportion of the granularity, and the invention finds that the proportion of the ultrafine-grained white horse vanadium-titanium concentrate in the Taihe pellet ore under the grain size condition is 30% -40%.
Although the production method of taihe vanadium-titanium pellets has been specifically described with reference to the embodiments of the present invention, it will be apparent to those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.
Claims (10)
1. The production method of Taihe vanadium-titanium pellets is characterized by comprising the following steps: the method comprises the following steps: according to the weight percentage, 50-90% of Taihe concentrate, 10-50% of ultrafine-grained vanadium-titanium magnetite concentrate and 2.0-2.5% of binder of the total weight of the concentrate are uniformly mixed and pelletized to obtain green pellets, and the Taihe vanadium-titanium pellets are obtained after drying, preheating, roasting and cooling of the green pellets.
2. The production method of taihe vanadium-titanium pellets according to claim 1, characterized in that: 60-70% of Taihe concentrate and 30-40% of ultrafine-grained vanadium-titanium magnetite concentrate.
3. The production method of taihe vanadium-titanium pellets according to claim 1 or 2, characterized in that: the particle size of the Taihe concentrate is as follows: particle size>7 to 10 percent of 0.15mm, 25 to 30 percent of grain diameter not less than 0.074mm and not more than 0.15mm, 20 to 23 percent of grain diameter not less than 0.045mm and not more than 0.074mm, and<60-65% of 0.074mm, grain size<0.045mm accounts for 40-45%; further, the taihe concentrate mainly comprises the following components: TFe 54.60% -55.5 wt%, FeO>30.5wt％，SiO23.70％～3.90wt％，TiO2 11.00％～11.50wt％，V2O5 0.61％～0.63％。
4. The method for producing taihe vanadium-titanium pellets according to any one of claims 1 to 3, wherein the method comprises the following steps: the particle size of the ultrafine-grained vanadium-titanium magnetite concentrate is as follows: particle size>0.15mm ratio<1 percent, the grain diameter not less than 0.074mm and not more than 0.15mm accounts for 7 to 10 percent, the grain diameter not less than 0.045mm and not more than 0.074mm accounts for 15 to 20 percent, the grain diameter<0.074mm ratio>90% particle diameter<0.045mm accounts for 65-70%; further, the ultrafine-grained vanadium-titanium magnetite concentrate mainly comprises the following components: TFe 56.0-56.5 wt%, FeO>33wt％，SiO2 3.40％～3.60wt％，TiO2 9.80％～10.20wt％，V2O50.71 to 0.73 weight percent; furthermore, the ultrafine-grained vanadium-titanium magnetite concentrate is white horse concentrate after four-stage grinding.
5. The method for producing taihe vanadium-titanium pellets according to any one of claims 1 to 4, wherein the method comprises the following steps: the binder is bentonite.
6. The method for producing taihe vanadium-titanium pellets according to any one of claims 1 to 5, wherein the method comprises the following steps: the preheating temperature is 800-850 ℃; preheating for 15-25 min; preferably, the preheating time is 800 ℃; the preheating time is 20 min.
7. The method for producing taihe vanadium-titanium pellets according to any one of claims 1 to 6, wherein the method comprises the following steps: the roasting temperature is 1200-1300 ℃; the roasting time is 30-50 min; preferably, the roasting temperature is 1250 ℃; the calcination time was 35 min.
8. The method for producing taihe vanadium-titanium pellets according to any one of claims 1 to 7, wherein the method comprises the following steps: the water content of the green pellets is 7.5-9.5%; the particle size of the green pellets is 8-16 mm, the 0.5m drop strength is more than 4 times per green pellet, and the compressive strength is more than 10N per green pellet.
9. The method for producing taihe vanadium-titanium pellets according to any one of claims 1 to 8, wherein the method comprises the following steps: the granularity of the Taihe vanadium-titanium pellet is 8-16 mm, and the compressive strength is greater than 2000N.
10. The taihe vanadium-titanium pellet prepared by the production method of the taihe vanadium-titanium pellet as claimed in any one of claims 1 to 9.
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| CN106148731A (en) * | 2016-08-10 | 2016-11-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The preparation method of ilmenite concentrate acid pellet |
| CN107287412A (en) * | 2017-06-14 | 2017-10-24 | 东北大学 | A kind of preparation method of high vanadium high-chromic vanadium-titanium ferroferrite pelletizing |
| CN107955885A (en) * | 2017-11-21 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of preparation method of modified ilmenite concentrate |
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