CN108998659B - Process for processing pellet ore by using siderite powder and vanadium-titanium magnetite powder - Google Patents
Process for processing pellet ore by using siderite powder and vanadium-titanium magnetite powder Download PDFInfo
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- CN108998659B CN108998659B CN201811048946.XA CN201811048946A CN108998659B CN 108998659 B CN108998659 B CN 108998659B CN 201811048946 A CN201811048946 A CN 201811048946A CN 108998659 B CN108998659 B CN 108998659B
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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
Abstract
The invention belongs to the technical field of metallurgical industry, and particularly relates to a process method for processing pellets by using siderite and vanadium-titanium magnetite powder. The method comprises three key processes of mixing and pelletizing, distributing and chain grate process and rotary kiln-circular cooler process control: the method comprises the steps of mixing the siderite brown iron ore powder and the vanadium-titanium magnetite ore powder in a certain proportion by wet grinding, controlling the pelletizing process to achieve the strength and granularity required by green pellets, conveying the mixture to a chain grate machine for drying and pre-thermal oxidation, controlling the drying and pre-heating process to reduce burst, entering a rotary kiln circular cooler for high-temperature consolidation cooling, controlling the temperature to avoid ring formation and hot pellet adhesion in a kiln, and producing finished pellets meeting the blast furnace ironmaking requirement. The process method successfully passes industrial tests, fills the domestic blank in the field, fully utilizes the siderite and the vanadium titano-magnetite which are abundant in reserves in various regions to process and produce high-quality ironmaking raw materials, and has great economic benefit and wide market prospect.
Description
Technical Field
The invention belongs to the technical field of metallurgical industry, and particularly relates to a process method for processing pellets by using siderite and vanadium-titanium magnetite powder.
Background
Pellet ore is a method for preparing artificial massive raw materials, and is a process for changing powdery materials into materials with physical properties and chemical compositions capable of meeting the requirements of the next processing. With the development of the iron and steel industry, raw materials required for iron making are larger and smaller, but the amount of the rich lump ore which can be directly fed into the furnace is smaller and smaller, the pellet ore is greatly developed since the last 60 years due to the good metallurgical property of the pellet ore, and the blast furnace smelting effect of the pellet ore is obviously better than that of other raw materials.
The prior pelletizing method and another sintering method for agglomeration are arranged into two methods for artificial block raw materials in parallel with the great superiority of the prior pelletizing method. The pellet method can be divided into two types of high-temperature consolidation and low-temperature consolidation according to a consolidation method, and the high-temperature consolidation is divided into six main methods of oxidized roasted pellets, reduced roasted pellets, magnetized roasted pellets, sodium-modified pellets, chlorinated pellets and the like, wherein the oxidized roasted pellets are the mainstream high-temperature consolidation method, and the pellet method is suitable for processing artificial lump ore by using magnetite as the main iron ore powder. In actual production, because the consumption of magnetite powder in the steel industry is large, the mining and separation cost is increased, the purchasing and transporting distance is increased, and the like, the pellet processing cost is improved, and part of areas of mineral species such as the siderite, the vanadium titano-magnetite and the like have rich reserves and low prices, and the pellet processing method can be used as a high-quality iron-making raw material through high-temperature roasting and the like, so that the development prospect is wide.
The siderite brown ore powder is a paragenetic ore (red ore) of siderite and limonite, and is characterized by low grade, large burning loss, decomposition of crystallized water and ferrous carbonate during drying and preheating, and low dry-ball strength; the vanadium-titanium magnetite concentrate powder has the characteristics of coarse granularity, small specific surface area, poor hydrophilicity of the surface of mineral powder particles, difficult balling in the process of pelletizing and the like, and the currently added siderite powder for processing and producing pellets is still in the laboratory research stage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a process method for processing pellets by using the siderite and the vanadium-titanium magnetite powder. The process method fully utilizes the siderite and the vanadium titano-magnetite which are abundant in reserves in various regions to process and produce high-quality ironmaking raw materials, and has great economic benefit and wide market prospect.
The invention relates to a process method for processing pellets by using siderite and vanadium-titanium magnetite powder, which comprises the following steps:
(1) pelletizing process of mixed ingredients
Firstly, mixing the siderite powder, the vanadium-titanium magnetite powder and the bentonite according to a certain ratio, drying and carrying out wet grinding pretreatment on the mixture, and processing the mixture into green pellets meeting the requirements through a pelletizing process;
(2) cloth and chain grate process
Conveying the qualified green pellets to a chain grate machine through a roller screen distributor for drying and preheating;
(3) rotary kiln-circular cooler process
And (4) feeding the dried and preheated balls into a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare pellets.
Wherein:
the mixture in the step (1) has the particle size requirement of more than 70 percent of granules with the particle size of less than 0.074mm and the moisture requirement of less than 8 percent.
The pelletizing process in the step (1) is carried out in a pelletizing disc, the grain size composition is controlled in the pelletizing process, the granularity of the green pellets is required to be more than 85% of the interval of 8-12mm, and the falling strength of the green pellets is required to be 8-10 times per pellet (the number of times that the green pellets fall freely without breaking at the height of 0.5 m).
And (2) controlling fog addition in the pelletizing process in the step (1) to reduce the water content in the green pellets, and controlling the water content in the green pellets within 8.5% to improve the cracking temperature of the green pellets in the drying process.
The raw materials comprise the following components in percentage by mass: the method comprises the following steps of (1) performing treatment on the siderite powder: 36-50%, vanadium-titanium-iron ore powder: 49-63%, bentonite: 1 to 1.8 percent.
The bentonite addition proportion is reduced in the pelletizing process, and the proportion is controlled within 1.8 percent so as to reduce the adhesion and deformation in the process of transporting green pellets.
As the water of crystallization and the decomposition of ferrous carbonate exist in the process of heating the siderite brown iron ore powder, the water content of the produced green ball is required to be lower, the ball diameter is properly reduced, and the falling strength is improved. By reducing fog and adjusting the inclination angle of the balling disk, the moisture of the green pellets is controlled within 8.5 percent, the proportion of the green pellet with the particle size diameter of 8-12mm is more than 85 percent, and the falling strength reaches 8-10 times per pellet, thereby laying a foundation for easy drying of the green pellets and reduction of burst during drying and preheating of subsequent processes.
The roller screen distributing device in the step (2) comprises a large ball roller screen device and a small ball roller screen device; the speed of the chain grate is controlled at 23-26 Hz. The machine speed, the kiln speed of the rotary kiln, the circular speed of the circular cooler and the like are controlled by a frequency converter, and the frequency of the frequency converter is used for expressing the speed.
Step (2) is to carry out further classification on the conveyed raw balls through a large ball roller sieve device and a small ball roller sieve device, adjust the gap between the large roller sieve device and the small roller sieve device, sieve out the raw balls or powder with the granularity of less than 6mm and more than 12mm, and the proportion of the raw balls with the granularity diameter of 8-12mm is more than 85 percent; the raw pellets are uniformly distributed on a grate bed of a chain grate for drying, preheating and primary oxidation, and the stacking thickness of the raw pellets on the grate bed is controlled to be 120 mm.
The temperature control requirements of the hood of the drying first section, the drying second section and the preheating section of the chain grate in the step (2) are respectively 300 ℃, 600 ℃ and 930 ℃, and the temperature of 13 wind boxes is required to rise stably to form gradient.
And controlling the temperature of 13 air boxes of the chain grate to rise stably in the drying and preheating process to form a gradient, specifically controlling the temperature gradient of the 13 air boxes from 80 ℃ to 460 ℃ to form a gentle temperature rise gradient, wherein the temperature rise gradient of each air box is not more than 50 ℃.
The green pellets conveyed by the mixing and pelletizing process are further classified by a large and small roller screen distributing device, the gap of the large and small roller screens is adjusted, the green pellets or powder with the granularity of less than 6mm and more than 12mm are screened out and uniformly distributed on a grate bed of a chain grate, and the stacking thickness of the green pellets on the grate bed is controlled to be 120 mm. The machine speed of the chain grate is controlled to be 23-26Hz, which is reduced by 15-20% compared with the normal material distributing machine speed. Adjusting the scales of air doors of the circulating fans at the two sides of the main exhaust fan and the chain grate to control the temperatures of the first-stage drying smoke hood, the second-stage drying smoke hood and the preheating smoke hood of the chain grate to be 300 ℃, 600 ℃ and 930 ℃, respectively, adjusting butterfly valves at the outlet of each air box, and forming gentle temperature rise gradients of 13 air boxes of the chain grate from 80 ℃ to 460 ℃, wherein the temperature rise gradient of each air box is less than 50 ℃. Through the adjustment of the mixing material pelletizing process and the material distributing and chain grate process, the strength of the preheated balls before entering the rotary kiln is 300-400N/balls, and the fracture proportion is less than 10 percent.
The control requirement of the rotary kiln high temperature point in the step (3) is 1240-1260 ℃, the air quantity is required to be increased when the ring cooling machine cools a section of air, the air door is opened to 15 percent (normally 8 to 10 percent), the air quantity is increased, the cooling time is increased to 1 hour (normally 45min), the temperature is 1010 ℃ for a section of time, and the material distribution thickness of the ring cooling machine trolley is required to be controlled to be 700mm (normally 760 mm).
The effective cooling area of the circular cooler in the process is 50m2If the effective cooling area in the process implementation process is large, the operation related to the working procedure can be omitted.
And (4) controlling the temperature of the kiln head cover of the rotary kiln in the step (3) to be 950 ℃ and 960 ℃ so as to stabilize the temperature interval of the high-temperature point.
And after the preheated balls enter the rotary kiln circular cooler process, carrying out high-temperature roasting cooling and further oxidizing. The temperature of the rotary kiln is stabilized, the temperature of a kiln head cover is controlled to be 960 ℃, the temperature of a high temperature point in the kiln is controlled to be 1240-1260 ℃, energy consumption waste is caused due to overhigh temperature, and powder hot balls in the kiln are easily bonded on the kiln wall. When the hot balls enter the circular cooler, the material distribution thickness of the trolley of the circular cooler is required to be controlled at 700mm (normally 760mm), the air quantity is increased by opening a first section of fan air door of the circular cooler to 15 percent (normally 8-10 percent), the temperature supplied by the outlet of the first section of fan is 1010 ℃, and the cooling time is increased to 1 hour (normally 45min), so that the hot balls are prevented from being adhered to each other in the cooling process and are fully secondarily oxidized. The effective cooling area of the circular cooler in the rotary kiln circular cooler process is 50m2, and if the effective cooling area in the process implementation process is large, the related operation of the process can be omitted.
The process method mainly aims to solve the problems that crystalline water and ferrous carbonate are decomposed during heating in the process of processing the artificial rich ore from the siderite powder, so that the artificial rich ore is easy to crack, the product is not easy to ball and has low strength, and the like.
The process method is mainly suitable for a 60 ten thousand ton annual chain grate-rotary kiln-circular cooler process production line and mainly comprises three procedures according to a control link: the method comprises a mixing material pelletizing procedure (I section procedure), a material distributing and chain grate machine procedure (II section procedure), and a rotary kiln-circular cooler procedure (III section procedure).
The process method uses the siderite brown iron ore powder and the vanadium-titanium magnetite powder to process the mixed pellet, has passed industrial tests, overcomes the difficulties of easy bursting, low strength and the like caused by the decomposition of the crystallized water and the ferrous carbonate in the drying and roasting process, and the roasted finished pellet has the compressive strength of more than 2000N/pellet, meets the GB/T27692 and 2011 requirements and can meet the requirements of iron-making production.
Compared with the prior art, the invention has the following beneficial effects:
(1) the finished pellet ore prepared by the process has the compressive strength of more than 2000N per pellet, meets the GB/T27692-2011 requirements, and can meet the requirements of iron-making production.
(2) The process method fully utilizes the siderite and the vanadium titano-magnetite which are abundant in reserves in various regions to process and produce high-quality ironmaking raw materials, and has great economic benefit and wide market prospect.
Drawings
Fig. 1 is a flow chart of pellet processing technology.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
In the process method for processing pellets from the siderite powder and the vanadium-titanium magnetite powder described in this embodiment 1, the pellets in the process method are composed of the siderite powder, the vanadium-titanium magnetite powder and bentonite, and the ingredients are as follows by mass: the method comprises the following steps of (1) performing treatment on the siderite powder: 36%, vanadium-titanium-iron ore powder: 62.2%, bentonite: 1.8 percent; in this example 1, the vanadium-titanium-iron ore powder is a globoid vanadium-titanium-iron ore powder.
The raw material-related physicochemical analysis in example 1 is shown in table 1.
Table 1 physicochemical analysis relating to raw materials in example 1
| Name (R) | TFe | FeO | SiO2 | Al2O3 | S | TiO2 | Moisture content | Granularity (-0.074mm) |
| Vanadium-titanium-iron ore powder | 56.20 | 27.30 | 4.94 | 3.23 | 0.24 | 9.9 | 5.94 | 70.37 |
| Powder of siderite | 43.63 | 2.67 | 7.92 | 1.32 | 0.075 | 0.54 | 10.04 | 65.15 |
The production process is controlled as the above working procedures I to III.
The mixing and pelletizing process is called as process I for short.
In the process I, the mixture is prepared from the following ingredients in percentage by mass: the method comprises the following steps of (1) performing treatment on the siderite powder: 36%, vanadium-titanium-iron ore powder: 62.2%, bentonite: 1.8 percent.
In the process I, the mixture composed according to a certain proportion is pretreated by drying, moistening and grinding, and enters a pelletizing disc for pelletizing to obtain green pellets.
The process of the material distribution and chain grate is called as a process II for short.
The green pellets conveyed in the process I are further classified by a large roller screen distributing device and a small roller screen distributing device in the process II, and are uniformly distributed on a grate bed of a chain grate for drying, preheating and primary oxidation.
The rotary kiln circular cooler process is abbreviated as process III.
And after the preheating balls enter the working procedure III, performing high-temperature roasting cooling and further oxidizing through a rotary kiln circular cooler.
In this example 1, the grain size composition of the mixture after drying, wetting and grinding in the process i is 76.02% when the grain size composition is less than 0.074 mm.
In example 1, green pellets produced by pelletizing in the step I had a falling strength of 10.5 pellets and a water content of 8.43%.
In the working procedure II of this example 1, the gap between the large and small roller sieves is adjusted to meet the requirement of sieving the green pellets or powder with the particle size of less than 6mm and more than 12 mm.
In the raw pellets entering the chain grate in the step II in the embodiment 1, the thickness of the stacked material layer on the grate is 120mm (normally 140mm), the running speed of the chain grate is 25-26Hz (controlled by a frequency converter), and the speed is reduced by 15-20% compared with the normal distributing speed.
In the example 1, the compressive strength of the preheated ball obtained by drying and preheating the process II by the grate is 389N/grain, and the cracking proportion is 5%.
In this example 1, the TFe content of the finished pellet after the high-temperature roasting, oxidation and cooling in the process iii is 53.19%, and the compressive strength is 2350N/pellet on average.
The iron content of the pellets produced by the process control of the embodiment 1 is 53.19%, the iron content of the pellets should be 51.35% by theoretical calculation, and laboratory data show that the burning loss rate of the magnesite powder is 18-20%, which is equivalent to that the iron grade of the product is increased along with the decomposition of the crystallized water and the ferrous carbonate in the preheating roasting process.
Example 2
The process method for processing pellets by using the siderite powder and the vanadium-titanium magnetite powder in the embodiment 2 is the same as the process method in the embodiment 1, except that: the weight percentage of the ingredients is as follows: the method comprises the following steps of (1) performing treatment on the siderite powder: 45% of vanadium-titanium-iron ore powder: 53.4%, bentonite: 1.6 percent; the raw materials of the vanadium-titanium-iron ore powder and the siderite ore powder used in this example 2 were the same as in example 1 except that the amounts used were different.
In the embodiment 2, after the mixture is dried, moistened and ground in the process I, the particle size composition of the mixture is 73.67% when the particle size composition is less than-0.074 mm, the falling strength of green pellets produced by pelletizing in the process I is 9.2 times per pellet, and the water content is 8.37%.
In example 2, the gap between the large and small roller screens is adjusted in the process II, so that green pellets or powder with the particle size of less than 6mm and more than 12mm can be screened out.
In the green pellets entering the chain grate in the step II in the embodiment 2, the thickness of the stacked material layer on the grate is 120mm (normally 140mm), the running speed of the chain grate is 25-26Hz (controlled by a frequency converter), and the speed is reduced by 15-20% compared with the normal distributing speed.
In the second step of this example 2, the operating speed of the grate was 24-25Hz, the compressive strength of the preheated balls after drying and preheating by the grate was 352N/ball, and the cracking rate was 6%.
In this example 2, the TFe content of the finished pellet after the high-temperature roasting, oxidation and cooling in the process iii is 53.75%, and the average compressive strength is 2125N/pellet.
Example 3
The process method for processing pellets by using the siderite powder and the vanadium-titanium magnetite powder in the embodiment 3 is the same as the process method in the embodiment 1, except that: the weight percentage of the ingredients is as follows: the method comprises the following steps of (1) performing treatment on the siderite powder: 49 percent of vanadium-titanium-iron ore powder: 49.6%, bentonite: 1.4 percent; the raw materials of the vanadium-titanium-iron ore powder and the siderite ore powder used in this example 3 were the same as in example 1 except that the amounts used were different.
In the embodiment 3, after the mixture is dried, wet-milled and processed in the process I, the particle size composition is 73.54% when the particle size composition is less than 0.074mm, the falling strength of green pellets produced by pelletizing in the process I is 9.5 times per pellet, and the moisture content is 8.33%.
In the working procedure II of this example 3, the gap between the large and small roller screens is adjusted to meet the requirement of screening out green pellets or powder with the particle size of less than 6mm and more than 12 mm.
In the second step of this example 3, the operating speed of the grate was 23-24Hz, the compressive strength of the preheated balls after drying and preheating by the grate was 318N/ball, and the cracking rate was 9%.
In this example 3, the TFe content of the finished pellet after the high-temperature roasting, oxidation and cooling in the process iii is 53.33%, and the compressive strength is 2057N/pellet on average.
The performance indexes of the green pellets, the preheated pellets after preheating and roasting, and the finished pellets in the embodiments 1 to 3 are respectively compared with those of the existing common magnetite oxide pellet, and the performance comparison results are shown in table 2.
TABLE 2 of green pellets, preheated pellets after preheating roasting and finished pellets in examples 1 to 3 and pellets of conventional general magnetite oxide
Comparison of Performance indicators
By comparing the pellet performance indexes in table 2, it can be found that the falling strength of the green pellets in examples 1 to 3 is generally higher than that of the ordinary magnetite pellets, and the falling strength is mainly to ensure that the cracking is reduced and the cracking temperature range is increased in the drying and preheating process. In fact, the bentonite addition mass percentages in examples 1-3 are 1.8%, 1.6%, and 1.4%, respectively (the mass percentage of the bentonite in the normal magnetite pellet is generally 2%), which is in a descending trend, while the green pellet falling strength is kept at 9-10 times per pellet, and the usage amount of the bentonite is reduced along with the increase of the proportion in the pelletizing process, which indicates that the limonite powder has better hydrophilicity and cohesiveness than the normal magnetite powder.
By comparing the performance indexes of the various examples in table 2 with those of ordinary pellets, it can be found that the compressive strength of the preheated pellets and finished pellets after the preheating roasting in examples 1 to 3 is reduced along with the increase of the proportion of the limonite powder, and the crushing rate of the preheated pellets is increased. Microscopic observation in a laboratory shows that the proportion of the limonite fine powder is increased, the influence of the decomposition of the crystal water and the carbonate is increased in the drying and preheating process, the internal porosity of the finished pellets is increased, and the compressive strength is reduced.
It can be seen from the above examples 1-3 that as the proportion of the powdered siderite increases, the compressive strength of the finished pellet decreases, and within a certain critical value, the compressive strength of the finished pellet calcined by the method can reach more than 2000N per pellet, which meets the requirement of GB/T27692-2011 and can meet the requirement of ironmaking production.
Claims (7)
1. A process method for processing pellets by using siderite and vanadium-titanium magnetite powder is characterized by comprising the following steps: the method specifically comprises the following steps:
(1) pelletizing process of mixed ingredients
Firstly, mixing the siderite powder, the vanadium-titanium magnetite powder and the bentonite according to a certain ratio, drying and carrying out wet grinding pretreatment on the mixture, and processing the mixture into green pellets meeting the requirements through a pelletizing process;
(2) cloth and chain grate process
Conveying the qualified green pellets to a chain grate machine through a roller screen distributor for drying and preheating;
(3) rotary kiln-circular cooler process
The preheated pellets after drying and preheating enter a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare pellets;
wherein: the mass ratio of the siderite powder, the vanadium-titanium magnetite powder and the bentonite is as follows by mass fraction: the method comprises the following steps of (1) performing treatment on the siderite powder: 36-50%, vanadium-titanium-iron ore powder: 49-63%, bentonite: 1 to 1.8 percent;
the roller screen distributing device in the step (2) comprises a large ball roller screen device and a small ball roller screen device;
step (2) the conveyed raw balls are further classified through a large ball roller screen device and a small ball roller screen device, the gap between the large roller screen device and the small roller screen device is adjusted, the raw balls or powder with the granularity of less than 6mm and more than 12mm are screened out and are uniformly distributed on a grate bed of a grate, and the stacking thickness of the raw balls on the grate bed is controlled to be 120 mm;
the control requirement of the rotary kiln high temperature point in the step (3) is 1240-1260 ℃, the air quantity is required to be increased when the annular cooler cools the first section of air, the air door is opened to 15 percent, the first section of temperature supply is 1010 ℃, and the material distribution thickness of the annular cooler trolley is required to be controlled to be 700 mm.
2. The process of claim 1, wherein the pellet ore is processed from the group consisting of limonite powder and magnetite powder containing vanadium and titanium, and the process comprises the following steps: the granularity of the mixture in the step (1) is required to be less than 0.074mm and is more than 70%, and the moisture is required to be less than 8%.
3. The process for preparing pellet ore from the powder of chabazite limonite and the powder of vanadium-titanium magnetite as claimed in claim 1, wherein the pelletizing step in step (1) is carried out in a pelletizing disk, the composition of the pellet size is controlled during the pelletizing step, the green pellet size is required to be more than 85% in the interval of 8 ~ 12mm, and the falling strength of the green pellet is required to be 8-10 times per pellet.
4. The process of claim 1, wherein the pellet ore is processed from the group consisting of limonite powder and magnetite powder containing vanadium and titanium, and the process comprises the following steps: and (2) controlling fog addition in the pelletizing process in the step (1) to reduce the water content in the green pellets, wherein the water content in the green pellets is controlled within 8.5 percent.
5. The process of claim 1, wherein the pellet ore is processed from the group consisting of limonite powder and magnetite powder containing vanadium and titanium, and the process comprises the following steps: the speed of the chain grate is controlled at 23-26 Hz.
6. The process of claim 1, wherein the pellet ore is processed from the group consisting of limonite powder and magnetite powder containing vanadium and titanium, and the process comprises the following steps: the strength of the preheated balls in the step (3) before entering the rotary kiln is 300-.
7. The process of claim 1, wherein the pellet ore is processed from the group consisting of limonite powder and magnetite powder containing vanadium and titanium, and the process comprises the following steps: the temperature of the kiln hood of the rotary kiln in the step (3) is controlled to be 960 ℃ below zero and the temperature of the high temperature point in the rotary kiln is controlled to be 1260 ℃ below zero.
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| CN112391525A (en) * | 2020-11-27 | 2021-02-23 | 攀枝花钢企米易白马球团有限公司 | Preparation method and preparation system of vanadium-titanium pellets |
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| CN101003851A (en) * | 2006-09-22 | 2007-07-25 | 攀钢集团钢城企业总公司球团厂 | Method for producing high titanium type acid pellet vanadium titanium by chain grate - rotary kiln |
| CN101649391B (en) * | 2009-06-26 | 2011-10-05 | 中冶长天国际工程有限责任公司 | Pellet preparation method |
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| CN102277462A (en) * | 2011-08-17 | 2011-12-14 | 北京科技大学 | Method for comprehensive utilization of vanadium titanomagnetite |
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