CN114807598A - Method for preparing vanadium-titanium pellets by using sea sand coarse powder - Google Patents
Method for preparing vanadium-titanium pellets by using sea sand coarse powder Download PDFInfo
- Publication number
- CN114807598A CN114807598A CN202210380387.2A CN202210380387A CN114807598A CN 114807598 A CN114807598 A CN 114807598A CN 202210380387 A CN202210380387 A CN 202210380387A CN 114807598 A CN114807598 A CN 114807598A
- Authority
- CN
- China
- Prior art keywords
- sea sand
- vanadium
- titanium
- coarse powder
- pellets
- 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
Links
Images
Classifications
-
- 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
-
- 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
- C22B1/16—Sintering; Agglomerating
-
- 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
Abstract
The invention discloses a method for preparing vanadium-titanium pellets by using sea sand coarse powder, relates to the technical field of metallurgy, and aims to solve the problems that in the industrial production of vanadium-titanium magnetite pellets, the preparation amount of the added sea sand coarse powder is difficult to improve, and the prepared pellets have poor performance. According to the invention, the vanadium-titanium pellet is prepared by improving a pelletizing process and a roasting process by adopting sea sand rough ores with the-200-mesh particle fraction of 60-60.2% and the bentonite schreyerite with the grade of 60-60.5%. The invention not only reduces the production cost, but also increases the system vanadium investment, and simultaneously plays a demonstration role in smelting the sea sand ore in the blast furnace. The method is applied to the field of vanadium-titanium pellet preparation.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for preparing vanadium-titanium pellets by using sea sand coarse powder.
Background
The sea placer is a natural iron-containing mineral formed by scouring action, is coarse powder containing vanadium and titanomagnetite with high cost performance, has very rich reserves, low cost and stable sources, and is used for example as the sea placer of the near beach of New Zealand. The cost can be reduced by using the titanium-containing sea placer in the sintering process. However, sea sand ore has poor sintering basic characteristics and coarse grain size, and all vanadium-titanium pellet ore prepared by the sea sand ore alone has poor pelletizing performance and belongs to hard-to-burn minerals. Titanium in the sea sand has adverse effects on the quality of the high-alkali sinter, the return ore rate is increased, the yield is reduced, and the subsequent stable production of a blast furnace is not facilitated.
At present, the pellet ore adopted by smelting vanadium-titanium magnetite is mostly full vanadium-titanium iron concentrate or part of ordinary iron concentrate powder, and the pellet ore is widely applied. However, since the resources of high-quality vanadium-titanium-iron ore are gradually reduced, it is a main research direction to find vanadium-titanium-iron ore concentrate resources with better performance price. In the field of vanadium-titanium pellets, in foreign countries, after vanadium-titanium sea placer on the north coast of New Zealand is reselected to obtain vanadium-titanium-containing iron ore concentrate, a rotary kiln prereduction-electric furnace method is adopted to obtain small-scale utilization. In China, the sea sand ore is only used as an auxiliary material of an iron-containing raw material in the blast furnace smelting process, and is mainly used for supplementing part of elements (such as vanadium), and the addition amount is not more than 10%.
The process for producing the black dragon river through the blast furnace is a vanadium-titanium smelting process, the source of the used vanadium-titanium ore is relatively complex, the vanadium-titanium magnetite ore, south African ore and the like are mostly from Chengdan area, and the diversity of the mineral types and the complexity of the composition bring great challenges to sintering and pellet production. In order to reduce the cost, a method capable of increasing the preparation amount of the coarse sea sand ore powder is urgently needed to increase the utilization efficiency of the coarse sea sand ore powder.
Patent publication No. CN 110512074B, entitled "method for preparing acid pellets from high-ratio New Zealand sea sand raw ore", provides: respectively drying the raw materials and the bentonite, and then screening; the raw material is a mixture of raw ore of the New Zealand sea sand and common iron ore concentrate, or a mixture of the raw ore of the New Zealand sea sand and vanadium titano-magnetite, or a mixture of the raw ore of the New Zealand sea sand and mixed ore; the mixed ore is the mixed ore of common iron ore concentrate and vanadium-titanium magnetite; wherein the mass of the raw ore of the New Zealand sea sand accounts for 0-80% of the mass of the mixture. The method is characterized in that after the sea sand powder is sieved, a pellet is prepared from-200-mesh-size sea sand powder and common iron powder or vanadium-titanium iron powder, a large amount of + 200-mesh-size sea sand coarse powder is generated, wherein the + 200-mesh-size sea sand powder is not completely utilized, and the-200-mesh-size sea sand powder crude ore is about 53 percent).
Patent publication No. CN 114196823A, patent name "a high-ratio sea sand type vanadium titano-magnetite multi-shell pellet and preparation method thereof", provides: selecting common ore (iron ore concentrate/vanadium titano-magnetite) with large specific surface area, fine granularity and excellent pelletizing performance as one of the raw materials for pelletizing, respectively designing the raw material proportion of the sea sand ore and the common ore according to different pelletizing stages, humidifying and stewing the materials to respectively obtain a pelletizing material formed by a mother ball, a large-sized pelletizing material formed by the mother ball and a green ball compacting and pelletizing material, adding the raw materials into a ball pan of a disc pelletizing machine in batches in different feeding modes, spraying water in a mist manner to correspondingly complete the pelletizing processes of the mother ball forming stage, the mother ball growing stage and the green ball compacting stage to obtain multi-shell pellets, roasting to prepare the pellets with large compressive strength and capable of meeting the actual smelting production, improving the adding amount (50-70%) of the sea sand type vanadium titano-magnetite in the pellet preparation process, and having important significance for the development and production application of the sea sand type vanadium titano-magnetite in large scale. The patent is to prepare multi-shell pellets by using common ores and sea sand powder with fine granularity and excellent pelletizing performance, and is not a full vanadium-titanium pellet in a real sense strictly speaking.
Disclosure of Invention
The invention aims to solve the problems that the preparation amount of the added sea sand coarse powder is difficult to improve and the prepared pellet performance is poor in the industrial production of vanadium-titanium magnetite pellets, and provides a method for preparing vanadium-titanium pellets by using the sea sand coarse powder.
The invention relates to a method for preparing vanadium-titanium pellets by using sea sand coarse powder, which is carried out according to the following steps:
firstly, improving the coarse powder size fraction of sea sand: carrying out wet grinding on the sea sand coarse ore to enable the-200-mesh particle size to reach 60-60.2%, the grade to reach 60-60.5%, and taking 10-25% of the sea sand coarse ore, 1.2-1.65% of bentonite and the balance of schreyerite fine powder according to the weight percentage;
secondly, pelletizing the vanadium-titanium pellets:
in the vanadium-titanium pellet pelletizing process, adjusting the angle of a pelletizing disc to 45-46 degrees, adjusting the height of the pelletizing disc to 640-660 mm, changing the material blanking point of an original pelletizing disc, and pelletizing by adopting an atomization water adding mode;
thirdly, roasting the vanadium-titanium pellets:
roasting the vanadium-titanium pellets according to the following roasting process conditions:
the roasting temperature is 1000-1020 ℃, the gas pressure is 19.5-20.5 kPa, and the combustion chamber pressure is 15-16 kPa; the temperature of the drying bed is 500-600 ℃, the pressure of the cold air is 31-33 kPa, and the amount of the waste gas and the cold air is 34000-40000m 3 H, the dedusting air volume is 450000m 3 The temperature of the smoke hood is 100-150 ℃; the dip angle of the small water beam of the drying bed is 38 degrees; the angle of the grate bars of the drying bed is 30 degrees; thus obtaining the vanadium-titanium pellet.
Further, the change of the material blanking point of the original ball tray refers to: and adjusting a blanking point to the middle-upper part of the right side of the ball tray.
Further, the atomization water adding mode is as follows: the atomizing water adding structure is added to the atomizing water adding structure and is installed on the ball disc, and a plurality of atomizing water nozzles are uniformly distributed on the cross beam.
Furthermore, the falling frequency of the bentonite is more than or equal to 6 times, the compressive strength is more than or equal to 1.5kg, and the granularity composition is as follows: the granularity of 8 mm-16 mm is more than 90 percent.
Further, the sea sand coarse ore is prepared into 15-25%, the bentonite is prepared into 1.2-1.65%, and the balance is schreyerite fine powder; the-200-mesh size fraction strength of the schreyerite fine powder is more than 80 percent.
Further, the angle of the balling disk is 45.5 degrees.
Further, the height of the balling disk is adjusted to 650 mm.
Further, the roasting process comprises the following steps:
the roasting temperature is 1000-1020 ℃, the gas pressure is 19.5-20.5 kPa, and the combustion chamber pressure is 15-16 kPa; the temperature of the drying bed is 550-570 ℃, the pressure of the cold air is 32-33 kPa, and waste is generatedThe air and cold air volume is 34000-40000m 3 H, the dedusting air volume is 450000m 3 The temperature of the smoke hood is 100-150 ℃.
Further, the roasting process comprises the following steps:
the roasting temperature is 1000-1015 ℃, the gas pressure is 19.5-20.5 kPa, and the combustion chamber pressure is 15-16 kPa; the temperature of the drying bed is 500-540 ℃, the pressure of cold air is 32-33 kPa, and the amount of waste gas and cold air is 34000-40000m 3 H, the dedusting air volume is 450000m 3 The temperature of the smoke hood is 100-150 ℃.
Further, the roasting process comprises the following steps:
the roasting temperature is 1000-1005 ℃, the gas pressure is 19.5-20.5 kPa, and the combustion chamber pressure is 15-16 kPa; the temperature of the drying bed is 520-540 ℃, the pressure of cold air is 32-33 kPa, and the quantity of waste gas and cold air is 35000-40000m 3 H, the dedusting air volume is 450000m 3 The temperature of the smoke hood is 100-150 ℃.
The invention has the following beneficial effects:
1. the sea sand ore belongs to low-grade mineral powder of New Zealand, vanadium titano-magnetite with low grade, high titanium and high vanadium content formed by soaking in seawater for a long time has low cost, abundant reserves, coarse grain size and poor wettability, and is not matched and successfully used in the actual industrial production of domestic pellets.
2. The preparation is tested and added in the pellet after the secondary processing of the sea sand mineral powder, the continuous optimization operation adjustment is carried out, the proportion is gradually improved from 10 percent to 25 percent, the vanadium content of the pellet is improved while the pellet production is met, namely the vanadium input of a system is improved, the vanadium product yield of the system is enlarged, and 25 percent of the sea sand mineral coarse powder added in the pellet belongs to the first industrial practical production case at present in China.
The invention aims to realize the industrial practical production application of the high-doping-amount marine placer, and the patents such as CN 110512074B and the like are not only in the laboratory stage.
The invention is different from CN 110512074B, CN 114196823A patent:
1. the pellet is prepared by sieving sea sand to obtain-200 mesh and adding common fine powder, and the pellet is prepared by adding whole sea sand powder and vanadium-titanium-iron powder.
1. The invention relates to a pellet production method, which is characterized in that 100 percent of-200 mesh size fraction and common fine powder are sieved by sea sand, and the sea sand coarse powder size fraction and the sea sand 200 mesh size fraction and vanadium-titanium iron powder are used for producing pellets under the condition of 60 percent.
2. The invention prepares vanadium-titanium pellets under the condition that the particle size of sea sand coarse powder-200 meshes is 60 percent, and the compressive strength of the prepared vanadium-titanium pellets reaches the standard of the national metallurgical standard of the compressive strength of 2200N/pellet.
3. The invention does not need to sieve the sea sand coarse powder, and the sea sand coarse powder is completely ground and prepared into the vanadium-titanium pellet with the vanadium-titanium powder. The invention relates to a method for preparing all-vanadium-titanium ore powder pellets by using sea sand coarse powder and schreyerite powder without adding common ore powder.
Therefore, the invention carries out the following process design:
in order to adapt the industrial production process to 10-25% of doping amount of sea sand coarse ore, particularly 25% of doping amount, the invention improves the ball process as follows:
1) the roasting temperature (1000-1041 ℃) is changed to be 50-30 ℃ lower than that of the original ordinary ball;
2) the cooling air quantity is adjusted to 34000- 3 The cold air quantity in the production of the conventional pellets is increased by 5000 plus 10000M 3 /h；
3) The temperature of the drying bed is increased by 50-100 ℃ from 500-600 ℃ and the temperature of the original common pellet drying bed is increased by 450-550 ℃;
4) the dedusting fan is improved, the dedusting air quantity is increased, the drying speed is improved, and the original dedusting air quantity is 319200m 3 The volume/h is increased to 450000m 3 /h；
5) The wind guide opening of the wind guide wall in the furnace is expanded from original 400mm to 570 mm, the pressure in the furnace is reduced, and the unit cold wind flow in the furnace is increased;
6) the dip angle of the small water beam of the drying bed is improved from the original design angle of 41 degrees to 38 degrees;
7) the angle of a grate bar louver structure of the drying bed is innovated, and the original designed grate bar louver angle of 36 degrees is changed into a grate bar angle of 30 degrees;
8) adjusting the angle of the balling disk to 45-46 degrees, adjusting the height of the balling disk to 640-660 mm,
9) and the atomizing and water adding mode is added, so that the function of spraying and pelletizing in the ball disc is realized.
10) The secondary processing and wet grinding of the coarse sea sand powder can lead the-200-mesh particle size to reach 60.2 percent, improve the grade by 5.78 percent, and adjust the bentonite to reach 60-60.5 percent, wherein the adjustment of the bentonite is mainly to pelletize green balls to meet the green ball quality, the dropping is more than or equal to 6 times, the compressive strength is more than or equal to 1.5kg, and the particle size composition is as follows: the requirement is that the thickness of 8 mm-16 mm is more than 90 percent.
The invention not only reduces the production cost, but also increases the system vanadium investment, and simultaneously plays a demonstration role in smelting the sea sand ore in the blast furnace.
Drawings
FIG. 1 is a flow chart of a production process of vanadium-titanium pellets.
Detailed Description
For the purpose of promoting a clear understanding of the objects, aspects and advantages of the embodiments of the invention, reference will now be made in detail to the embodiments of the present disclosure, and it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure.
The exemplary embodiments of the present invention and the description thereof are provided to explain the present invention and not to limit the present invention.
The method for preparing vanadium-titanium pellets by using the sea sand coarse powder comprises the following specific steps:
1. improving the sea sand powder size fraction: the sea sand powder has low grade and coarse grade, the grade of-200 meshes is 26.59 percent, the green ball pelletizing quality is influenced, the-200 meshes is up to 60.2 percent by secondary wet grinding and deep processing of the sea sand ore, the grade is improved by 5.78 percent, the specific surface area of the sea sand ore powder is improved, the green ball pelletizing performance is improved, and the falling strength and the compressive strength of the green ball meet the requirements of the green ball quality.
Coarse sea sand ore powder, bentonite and domestic schreyerite fine powder; the-200-mesh size fraction strength of the schreyerite fine powder is more than 80 percent. Preparing raw materials of the vanadium-titanium pellets (see table 1 for details).
In the embodiment, as the vanadium-titanium pellets are produced by adding the sea sand coarse powder and other vanadium-titanium ore powder, the ore powder size fraction composition and the ore powder specific surface area are different, the bentonite adjustment mainly uses green pellets to meet the green pellet quality, the green pellets fall for more than or equal to 6 times, the compressive strength is more than or equal to 1.5kg, and the particle size composition is as follows: the thickness of 8 mm-16 mm is more than 90%; the standard is adopted, the proportioning range is adjusted to be 0.2-0.5%, the optimal proportioning of the bentonite is 1.65%, the balling property of the mineral powder is improved, and the green ball quality is good.
2. The vanadium-titanium pellet pelletizing technology comprises the following steps: the sea sand has coarse powder grade, is difficult to pelletize compared with other mineral powder green pellets, and can be adjusted from 47 degrees to 45.5 degrees by adjusting the angle of a pelletizing disc, changing the material blanking point of the original pellet disc, increasing the atomizing and water adding modes and adjusting the use amount of added bentonite, so that the quality of pellet ore is improved, and the pellet production is met.
The atomizing and water adding mode is that an additional spraying beam structure is adopted, a 306 stainless steel outer body is adopted by a spraying beam, the spraying beam is installed on a ball disc in a chain hanging mode, 3-6 special nozzles are arranged on the beam, and the spraying function is achieved. The equipment for spraying the spherical disc comprises a water-gas control unit and a fog particle level control unit, and realizes the functions of spraying and pelletizing in the spherical disc together with water control, fog amount control and fog particle level control. The use of the technology enables the sea sand coarse powder, which is the particle-level coarse powder, to meet the pelletizing requirement in pelletizing production.
3. The vanadium-titanium pellet roasting technology comprises the following steps:
firstly, gradually adjusting the roasting temperature (see table 2) and the cold air amount (see table 2) through the production practice and technical key points, wherein in the field operation, according to the coal gas pressure of 19.5-20.5 kPa and the combustion chamber pressure of 15-16kPa, a fire operator is responsible for stabilizing the green pellet amount: the ball production rate rhythm is reasonably controlled according to the furnace temperature; the roasting temperature is reduced, the coal gas consumption is reduced, the technical operation of reducing the temperature of the combustion chamber and improving the cold air quantity is realized.
Secondly, the temperature of the drying bed is 500-600 ℃, the cold air pressure is 31-33 kPa, the drying of the bed surface is kept, the material is discharged uniformly and stably, the drying speed and the bursting condition of the drying bed are concerned, and the waste gas and cold air quantity are adjusted to 34000-40000m according to the drying condition of the bed surface 3 H, the dedusting air volume is 450000m 3 The temperature of the smoke hood is 100-150 ℃; the dip angle of the small water beam of the drying bed is 38 degrees; the angle of the grate bars of the drying bed is 30 degrees; by controlling the proper temperature of the drying bed, the green pellets are dried quickly in the furnace, the consolidation speed is increased, the movement time of the furnace charge in the furnace is greatly shortened, and the good production condition of multiple rows is realized.
4. And (3) field industrial production:
through the technical clearance of the system and continuous optimization operation and adjustment, the sea sand powder ratio is gradually improved from 10% to 25%, the vanadium content of the pellets is improved while the pellet production is met, and the compression strength of the pellet quality reaches 2288.75N/pellet.
5. Successful achievement promotion of industrial test
At present, the addition of 25% of sea sand coarse powder into vanadium-titanium pellets belongs to the first practical production in China, and the technology can be widely applied to the production of vanadium-titanium pellets in iron and steel enterprises.
The innovation of the embodiment is as follows:
1. carrying out secondary processing and wet grinding on the sea sand coarse powder to ensure that the-200-mesh particle size reaches 60.2 percent, the grade is improved by 5.78 percent and reaches 60-60.5 percent;
the sea sand coarse powder has thicker particle size fraction and a specific surface area which can not meet the requirement of green ball pelletizing, and by processing and improving the particle size fraction, adjusting the blanking point of a ball disc and the angle of the ball disc, prolonging the pelletizing time, adding the atomized water and adjusting the proportion of bentonite, under the condition that the proportion of the sea sand coarse powder is increased continuously, various pelletizing parameters are optimized continuously, so that the content of the sea sand coarse powder is increased from 10% to 25%, and the quality of green balls meets the requirement of entering a furnace.
When 10% of sea sand coarse powder is added, the proportion of bentonite is 1.4%, the falling and compression resistance basically meet the quality of green pellets, but the qualification rate is low, when the sea sand coarse powder is adjusted to 15%, the green pellets fall and the compression resistance tend to fall, the coarse particles on the surface layer of the green pellets are more, the bentonite amount is adjusted, the effect is not obvious, the ball disc angle is adjusted, the test is adjusted in the range of 0.5 degrees, the adjustment is slightly improved, the balling performance is improved along with the use of atomized water, the proportion of the basic sea sand coarse powder is adjusted to 20%, the proportion of the bentonite is adjusted, the ball disc angle is correspondingly adjusted to 46 degrees according to the balling effect of the green pellets, the quality of the green pellets does not have the degradation tendency, the test sea sand coarse powder is adjusted to 25%, the coarse particles on the surface layer of the green pellets are increased, the bentonite is adjusted to 1.65%, the ball disc angle is adjusted to 45.5 degrees, the atomized water nozzles are opened, the falling and the compression resistance strength of the green pellets meets the furnace entering requirement, the sea sand coarse powder has lower grade than other vanadium and titanium powder, the proportion is continuously increased, the grade of finished pellets is influenced, and therefore the sea sand coarse powder is stabilized by 25 percent, and the requirements of increasing vanadium input and reducing pellet cost are met.
2. Ball disk blanking point adjustment optimization and atomization water spraying pelletizing
3. The roasting temperature control range (1000-1020 ℃) is 50-30 ℃ lower than the roasting temperature of the ordinary ball, the heat brought by cooling air is increased, and the heat is supplied by oxidation and heat release of the vanadium titano-magnetite.
4. Amount of cold air (35000- 3 Perh) the cold air quantity is increased by 5000-10000M compared with the common pellet production 3 Because the cooling belt in the furnace is subjected to convection heat exchange by the blown cold air, the cold air is increased to bring a large amount of oxygen content, so that the recrystallization of iron oxides in the pellets and the solid-phase reaction are fully completed, the pellets are fully consolidated, the strength of the pellets is further improved, and the quality is more uniform.
5. The adjustment of the angle of the ball disc is innovative and is adjusted from 47 ℃ of the original design to 45.5 ℃.
6. The ball disc atomizing water spray head spraying area is formed by additionally arranging a water dripping area, an atomizing area and an atomizing compact area in an original long ball area.
7. The height of the balling disk is increased by 50mm from 600mm to 650 mm.
TABLE 1 addition of sea sand coarse powder green pellet and bentonite adjustment data
TABLE 2 calcination System operating parameters
Different from the prior method that pellets are prepared by sieving sea sand powder with 100 percent of-200 meshes and common fine powder, and finished products are produced according to the conventional pellet production operation, the embodiment is a method that the pressure resistance of vanadium-titanium pellets prepared by modifying and innovating the original normal pellet production process and equipment is higher than the standard of the national metallurgical standard pressure resistance 2200N/pellet by adding vanadium-titanium iron powder to the sea sand coarse powder under the condition that the-200 meshes account for 60 percent.
In the embodiment, 10 percent of sea sand coarse powder is added, the temperature for executing the roasting system is controlled to be 1000 ℃, the temperature of a drying bed is controlled to be 450 ℃ and 550 ℃, and the cold air quantity is controlled to be 25000M 3 H, the compression strength of the finished balls is not changed greatly, the air permeability in the furnace is stable, the drying bed surface does not crack, the electric vibration discharging is not agglomerated, the red balls are about 1/4, the sea sand coarse powder proportion is adjusted to 15 percent, the green ball drying speed is slightly reduced, the drying discharging is slowed down, the dried material surface generates dust, the red ball proportion is increased during the electric vibration discharging, the ferrous content of the finished balls is increased, the drying temperature is gradually increased, the roasting temperature is reduced, the experiment increases the cold air quantity 25000 and 30000M 3 Improving and increasing the oxidizing atmosphere, slightly reducing the compressive strength of a finished product, having no influence on the yield, increasing the ratio of the coarse powder of the test sea sand to 20 percent, adjusting the roasting temperature to 1010 ℃ along with the increase of the ratio, gradually increasing the cold air flow according to the pressure of a combustion chamber, controlling the drying temperature to be 400-plus 500 ℃, observing the finished product balls, having regular particle size, no agglomeration and a small quantity of red balls, increasing the cold air flow, controlling the roasting temperature to be 1015 ℃, 1020 ℃ and 1030 ℃, keeping the cold air flow constant under different roasting temperatures, improving the drying speed of the green balls at 1015 ℃, the pressure of the combustion chamber, the strength of the finished product, the yield and other indexes better, adjusting the ratio of the coarse powder of the test sea sand to 25 percent, the drying temperature is controlled at 400-550 ℃, the drying speed is reduced, the yield is reduced compared with the comparative yield, the drying temperature is gradually increased to 500-550 ℃,experiment increases cold wind quantity 30000- 3 H, the drying speed of the green pellets is improved, the baking temperature is 1015-1020 ℃, the pressure of a combustion chamber is normal, the cracking phenomenon does not occur on the surface of the drying bed, the finished pellets discharged outside by electric vibration are normal, the yield is slightly improved, and the amount of cold air is increased to 35000-40000M 3 H, the pressure of the combustion chamber is reduced, which shows that the air permeability in the furnace is improved, the oxidation reaction is sufficient, the ferrous iron of the finished product ball is less than 1 percent, according to the test arrangement, the amount of cold air is increased to 40000-52000M in the test adjustment during the period that the sea sand coarse powder is mixed to 25 percent of stable production 3 And h, the yield and the strength of the finished ball meet the production standard.
Claims (10)
1. A method for preparing vanadium-titanium pellets by using sea sand coarse powder is characterized by comprising the following steps:
firstly, improving the coarse powder size fraction of sea sand: carrying out wet grinding on the sea sand coarse ore to enable the-200-mesh particle size to reach 60-60.2%, the grade to reach 60-60.5%, and taking 10-25% of the sea sand coarse ore, 1.2-1.65% of bentonite and the balance of schreyerite fine powder according to the weight percentage;
secondly, pelletizing the vanadium-titanium pellets:
in the vanadium-titanium pellet pelletizing process, adjusting the angle of a pelletizing disc to 45-46 degrees, adjusting the height of the pelletizing disc to 640-660 mm, changing the material blanking point of an original pelletizing disc, and pelletizing by adopting an atomization water adding mode;
thirdly, roasting the vanadium-titanium pellets:
roasting the vanadium-titanium pellets according to the following roasting process conditions:
the roasting temperature is 1000-1020 ℃, the gas pressure is 19.5-20.5 kPa, and the combustion chamber pressure is 15-16 kPa; the temperature of the drying bed is 500-600 ℃, the pressure of the cold air is 31-33 kPa, and the amount of the waste gas and the cold air is 34000-40000m 3 H, the dedusting air volume is 450000m 3 The temperature of the smoke hood is 100-150 ℃; the dip angle of the small water beam of the drying bed is 38 degrees; the angle of the grate bars of the drying bed is 30 degrees; thus obtaining the vanadium-titanium pellet.
2. The method for preparing vanadium-titanium pellets by using the sea sand coarse powder as claimed in claim 1, wherein the changing of the material feeding point of the raw pellet is as follows: and adjusting a blanking point to the middle-upper part of the right side of the ball tray.
3. The method for preparing vanadium-titanium pellets by using the sea sand coarse powder as claimed in claim 1, wherein the atomization and water addition method comprises the following steps: the atomizing water adding structure is added to the atomizing water adding structure and is installed on the ball disc, and a plurality of atomizing water nozzles are uniformly distributed on the cross beam.
4. The method for preparing vanadium-titanium pellets by using the sea sand coarse powder as claimed in claim 1, wherein the bentonite has a dropping frequency of not less than 6 times, a compressive strength of not less than 1.5kg, a particle size composition of: the granularity of 8 mm-16 mm is more than 90 percent.
5. The method for preparing vanadium-titanium pellets by using the sea sand coarse powder as claimed in claim 1, wherein the sea sand coarse powder is prepared from 15-25% of sea sand coarse powder, 1.2-1.65% of bentonite, and the balance of vanadium-titanium ore fine powder; the-200-mesh size fraction strength of the schreyerite fine powder is more than 80 percent.
6. The method for preparing vanadium-titanium pellets by using the sea sand coarse powder as claimed in claim 1, wherein the angle of the pelletizing disc is 45.5 °.
7. The method for preparing vanadium-titanium pellets by using the sea sand coarse powder as claimed in claim 1, wherein the height of the pelletizing disc is adjusted to 650 mm.
8. The method for preparing vanadium-titanium pellets by using the sea sand coarse powder as claimed in claim 1, wherein the roasting process comprises:
the roasting temperature is 1000-1020 ℃, the gas pressure is 19.5-20.5 kPa, and the combustion chamber pressure is 15-16 kPa; the temperature of the drying bed is 550-570 ℃, the pressure of cold air is 32-33 kPa, and the amount of waste gas and cold air is 34000-40000m 3 H, the dedusting air volume is 450000m 3 The temperature of the smoke hood is 100-150 ℃.
9. The method for preparing vanadium-titanium pellets by using the sea sand coarse powder as claimed in claim 1, wherein the roasting process comprises:
the roasting temperature is 1000-1015 ℃, the gas pressure is 19.5-20.5 kPa, and the combustion chamber pressure is 15-16 kPa; the temperature of the drying bed is 500-540 ℃, the pressure of cold air is 32-33 kPa, and the amount of waste gas and cold air is 34000-40000m 3 H, the dedusting air volume is 450000m 3 The temperature of the smoke hood is 100-150 ℃.
10. The method for preparing vanadium-titanium pellets by using the sea sand coarse powder as claimed in claim 1, wherein the roasting process comprises:
the roasting temperature is 1000-1005 ℃, the gas pressure is 19.5-20.5 kPa, and the combustion chamber pressure is 15-16 kPa; the temperature of the drying bed is 520-540 ℃, the pressure of cold air is 32-33 kPa, and the quantity of waste gas and cold air is 35000-40000m 3 H, the dedusting air volume is 450000m 3 The temperature of the smoke hood is 100-150 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210380387.2A CN114807598A (en) | 2022-04-12 | 2022-04-12 | Method for preparing vanadium-titanium pellets by using sea sand coarse powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210380387.2A CN114807598A (en) | 2022-04-12 | 2022-04-12 | Method for preparing vanadium-titanium pellets by using sea sand coarse powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114807598A true CN114807598A (en) | 2022-07-29 |
Family
ID=82535208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210380387.2A Pending CN114807598A (en) | 2022-04-12 | 2022-04-12 | Method for preparing vanadium-titanium pellets by using sea sand coarse powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114807598A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517442A (en) * | 2011-12-08 | 2012-06-27 | 黑龙江建龙钢铁有限公司 | Preparation method of high-chromium high-vanadium type vanadium-titanium ore pellets |
| CN103924069A (en) * | 2014-04-15 | 2014-07-16 | 四川省川威集团有限公司 | Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials |
| CN104862472A (en) * | 2015-05-12 | 2015-08-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-titanium pellet and preparing method thereof |
| WO2018228155A1 (en) * | 2017-06-14 | 2018-12-20 | 东北大学 | Preparation method for high-vanadium high-chromium type vanadium titanium magnetite pellets |
| CN110512074A (en) * | 2019-09-29 | 2019-11-29 | 东北大学 | A kind of method that high mixture ratio New Zealand sea sand raw ore prepares acid pellet |
| CN112410552A (en) * | 2019-08-23 | 2021-02-26 | 攀枝花毛毛虫科技有限公司 | Preparation method of vanadium-titanium pellets |
| CN114196823A (en) * | 2021-11-23 | 2022-03-18 | 东北大学 | High-proportion sea sand type vanadium titano-magnetite multi-shell pellet and preparation method thereof |
-
2022
- 2022-04-12 CN CN202210380387.2A patent/CN114807598A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517442A (en) * | 2011-12-08 | 2012-06-27 | 黑龙江建龙钢铁有限公司 | Preparation method of high-chromium high-vanadium type vanadium-titanium ore pellets |
| CN103924069A (en) * | 2014-04-15 | 2014-07-16 | 四川省川威集团有限公司 | Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials |
| CN104862472A (en) * | 2015-05-12 | 2015-08-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-titanium pellet and preparing method thereof |
| WO2018228155A1 (en) * | 2017-06-14 | 2018-12-20 | 东北大学 | Preparation method for high-vanadium high-chromium type vanadium titanium magnetite pellets |
| CN112410552A (en) * | 2019-08-23 | 2021-02-26 | 攀枝花毛毛虫科技有限公司 | Preparation method of vanadium-titanium pellets |
| CN110512074A (en) * | 2019-09-29 | 2019-11-29 | 东北大学 | A kind of method that high mixture ratio New Zealand sea sand raw ore prepares acid pellet |
| CN114196823A (en) * | 2021-11-23 | 2022-03-18 | 东北大学 | High-proportion sea sand type vanadium titano-magnetite multi-shell pellet and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 孙斌煜: "《钢铁生产概论》", 北京：冶金工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101717854B (en) | Method for producing metallized pellet by using metallurgical roasting furnace | |
| CN102102147B (en) | Process for producing magnesium pellet by grate rotary kiln | |
| CN101538632A (en) | Preparation process and device of sponge iron | |
| CN103205561A (en) | Coal-based magnetic roasting method for powdery refractory low-grade iron ore carbon-bearing pellets by pellet shaft furnace | |
| WO2011029269A1 (en) | Method for innocuously treating chromium residue using metallurgical roasting and blast furnace | |
| CN109261980A (en) | A kind of preparation method of heavy alloy tungsten powder | |
| CN1114360A (en) | Method for producing direct reduced iron | |
| CN212370109U (en) | Device for preparing spherical composite oxygen carrier | |
| CN101289697B (en) | Blast furnace ironmaking raw material and method for preparing same | |
| CN108998659B (en) | Process for processing pellet ore by using siderite powder and vanadium-titanium magnetite powder | |
| CN103627895A (en) | Production method for sintering chromium powder ore by continuous strand sinter machine | |
| CN106636627B (en) | A method of producing clinker and oxide pellet | |
| CN102230079A (en) | Process for producing magnesia pellets by using chain grate machine rotary kiln | |
| CN113333770B (en) | Preparation method of powder metallurgy iron powder | |
| JP2017505379A (en) | Production method of manganese-containing alloy iron | |
| CN102268533A (en) | Horizontally movable-fixed bed type magnetic reduction roasting process | |
| CN113351872A (en) | Powder metallurgy iron powder preparation method based on electromagnetic field effect | |
| CN114807598A (en) | Method for preparing vanadium-titanium pellets by using sea sand coarse powder | |
| CN110791351A (en) | Preparation method, product and device of spherical composite oxygen carrier | |
| JP3144886B2 (en) | Method for producing sintered ore or pellet ore as raw material for blast furnace using lime cake | |
| CN115874047A (en) | Fluxed pellet containing specularite and preparation method thereof | |
| CN104745797A (en) | Material distributing method for sintering of chromite fine powder pellets | |
| CN108004396B (en) | It is a kind of to produce acidic oxidation pellet method using nickel slag | |
| CN110564949B (en) | Method for reducing powder content of alkaline pellet | |
| CN103589865B (en) | Method for producing metallized pellets by direct reduction of powdered iron by carbon cycle oxygenation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |