CN113136486B - Production method and formula of pellets added with low-nickel high-iron nickel ore - Google Patents
Production method and formula of pellets added with low-nickel high-iron nickel ore Download PDFInfo
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- CN113136486B CN113136486B CN202010508181.4A CN202010508181A CN113136486B CN 113136486 B CN113136486 B CN 113136486B CN 202010508181 A CN202010508181 A CN 202010508181A CN 113136486 B CN113136486 B CN 113136486B
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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
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
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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
- C22B1/16—Sintering; Agglomerating
- C22B1/216—Sintering; Agglomerating in rotary furnaces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a method for producing pellets added with low-nickel high-iron nickel ore, which uses the low-nickel high-iron nickel ore to replace bentonite completely or partially, increases the using amount, mixes the low-nickel high-iron nickel ore with fine iron powder, carries out drying and wet grinding pretreatment, uses a pelletizing device, adds water to pelletize the mixture to form green pellets, screens out qualified green pellets, conveys the qualified green pellets to a chain grate machine through a distributor, carries out drying preheating, and enters a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets. On the premise of meeting the requirement of blast furnace charging, the low-nickel high-iron nickel ore is used for replacing bentonite in pellet production, the using amount is further increased, and the quality and the economic benefit of pellet ore are improved.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a production method and a formula of pellets for blast furnace ironmaking.
Background
The existing pellet production process mainly adopts fine iron powder as a raw material, uses bentonite as an additive, and mainly aims to improve the falling strength and the bursting temperature of green pellets, but the additive does not contain iron and can obviously reduce the pellet grade after being used in large quantity, theoretically, the grade of finished pellets is reduced by about 0.55 percent and the strength of the finished pellets is also reduced every time 1 percent of bentonite is added, so that the pellet value is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pellet production method which reduces or is not suitable for bentonite, so as to improve the economic benefit of pellet and reduce the production cost of steel.
The technical means adopted by the invention are as follows.
A method for producing pellets added with low-nickel high-iron nickel ore sequentially comprises the following steps:
step (1), material preparation and mixing: mixing the low-nickel high-iron nickel ore and the iron concentrate powder, completely or partially replacing bentonite with the low-nickel high-iron nickel ore, and performing drying and wet grinding pretreatment;
pelletizing in step (2): adding water into the mixture by using pelletizing equipment to pelletize the mixture into green pellets, and screening out qualified green pellets;
step (3), material distribution and drying preheating: conveying the qualified green pellets to a chain grate machine through a distributor, and drying and preheating;
roasting and cooling in the step (4): and (3) feeding the preheated green pellets into a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets.
In the step (1), the low-nickel high-iron nickel ore, the iron concentrate powder and the bentonite are proportioned according to mass fraction, and the raw materials comprise: low-nickel high-iron nickel ore: 1% -15%, fine iron powder: 85-99%, bentonite: 0 to 5 percent.
In the step (1), the granularity requirement of the mixture is that the granularity of the granules which are less than or equal to 0.074mm is more than or equal to 75 percent.
The pelletizing process in the step (2) is carried out in a pelletizing disc, the grain size composition is controlled in the pelletizing process, the green pellet granularity is required to be more than or equal to 85 percent in an 8-16mm interval, the falling strength of the green pellet is required to be more than or equal to 5 times per pellet, and the compressive strength is more than or equal to 10N per pellet; the addition amount of water is controlled, and the water content of the green ball is less than or equal to 8.7 percent.
The distributing device in the step (3) comprises a large ball roller screen device and a small ball roller screen device, the conveyed raw balls are further classified through the large ball roller screen device and the small ball roller screen device, and the gap between the large roller screen device and the small roller screen device is adjusted, so that the proportion of the obtained raw balls with the granularity diameter of 8-16mm is more than 85%.
In the step (3), the drying and preheating are divided into a drying section and a preheating section, the temperature of the starting end of the drying section is 100 ℃, the temperature of the end point of the preheating section is 1050 ℃, the temperature is increased in a gradient manner, the machine speed of a chain grate machine is 1.5m/min, the strength of the preheated balls before entering the rotary kiln is more than or equal to 300N/ball, and the fracture ratio is less than 10%.
A pellet formula for producing pellets by adding low-nickel high-iron nickel ore is prepared by mixing low-nickel high-iron nickel ore and iron concentrate powder, and completely or partially replacing bentonite with low-nickel high-iron nickel ore.
The low-nickel high-iron nickel ore, the iron concentrate powder and the bentonite are proportioned by mass fraction and comprise the following components: low-nickel high-iron nickel ore: 1% -15%, fine iron powder: 85-99%, bentonite: 0 to 5 percent.
The invention has the beneficial effects that: the low-nickel high-iron nickel ore has low price, the price of the fine iron powder is about 3 to 4 times of that of the low-nickel high-iron nickel ore, and the price of the fine iron powder is about 3 times of that of the low-nickel high-iron nickel ore in terms of tonnage. The low-nickel high-iron nickel ore is used for replacing bentonite in pellet production, the using amount is further increased, and the quality and the economic benefit of pellet ore are improved.
Drawings
FIG. 1 is a flow chart of a pellet production method of the present invention.
Detailed Description
Theoretically, the grade of finished pellets is increased by about 0.55% every time 1% of bentonite is replaced. As shown in table 1, the components and properties of the conventional bentonite and low-nickel high-iron nickel ore are shown. The low-nickel high-iron nickel ore has the iron content of 45-50 percent and the nickel content of less than 1 percent, has lower iron content than that of mainstream iron ore, is not suitable for producing sintered ore, and has no industrial value for producing ferronickel because of low nickel content, thereby being less used in steel production, but has the characteristic that the balling index is far higher than that of bentonite.
TABLE 1
According to the basic principle, the invention provides a method for producing pellets added with low-nickel high-iron nickel ore, which sequentially comprises the following steps:
step (1) batching and mixing: mixing the low-nickel high-iron nickel ore and the iron concentrate powder, completely or partially replacing bentonite with the low-nickel high-iron nickel ore, and performing drying and wet grinding pretreatment.
Pelletizing in step (2): and (3) pelletizing the mixture by using pelletizing equipment and adding water to form green pellets, and screening out qualified green pellets.
Step (3), material distribution and drying preheating: and conveying the qualified green pellets to a chain grate machine through a distributor for drying and preheating.
Roasting and cooling in the step (4): and (3) feeding the preheated green pellets into a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets.
In the step (1), the low-nickel high-iron nickel ore, the iron concentrate powder and the bentonite are proportioned according to mass fraction, and the raw materials comprise the following components: low-nickel high-iron nickel ore: 1% -15%, fine iron powder: 85-99%, bentonite: 0 to 5 percent. In the step (1), the low-nickel high-iron nickel ore needs to be subjected to stone removal and other impurities, and then is dried by an airing and drying machine to remove part of water, so that the dry low-nickel high-iron nickel ore is obtained. This is a common practice in the art and is well known to those of ordinary skill in the art.
In the step (1), the granularity requirement of the mixture is that the granules with the granularity less than or equal to 0.074mm are more than or equal to 75 percent.
In the step (1), the low-nickel high-iron nickel ore is subjected to impurity removal and drying treatment.
The pelletizing process in the step (2) is carried out in a pelletizing disc, the grain size composition is controlled in the pelletizing process, the green pellet granularity is required to be more than or equal to 85 percent in an 8-16mm interval, the falling strength of the green pellet is required to be more than or equal to 5 times per pellet, and the compressive strength is more than or equal to 10N per pellet; the addition amount of water is controlled, and the water content of the green ball is less than or equal to 8.7 percent.
The distributing device in the step (3) comprises a large ball roller screen device and a small ball roller screen device, the conveyed raw balls are further classified through the large ball roller screen device and the small ball roller screen device, and the gap between the large roller screen device and the small roller screen device is adjusted, so that the proportion of the obtained raw balls with the granularity diameter of 8-16mm is more than 85%.
The drying and preheating in the step (3) are divided into a drying section and a preheating section, the temperature of the starting end of the drying section is 100 ℃, the temperature of the end point of the preheating section is 1050 ℃, the temperature is increased in a gradient manner, the machine speed of a chain grate machine is 1.5m/min, the strength of the preheated balls before entering the rotary kiln is more than or equal to 300N/ball, and the fracture ratio is less than 10 percent
The following are specific examples.
Fig. 1 is a flow chart of a pellet production method in the present application. The equipment that uses in this case all is current mature equipment.
Example 1
The production method is as described in the above steps (1) to (4).
In the step (1), the dry basis mass percentage of the ingredients is as follows: 97% of iron fine powder, 1% of low-nickel high-iron nickel ore powder and 2% of bentonite.
In the step (2), the water content is 8.6%.
In the step (3), the gap between the roller screens is adjusted to meet the requirement of screening out green balls or powder with the granularity of less than 8mm and more than 16 mm.
The drying and preheating parameters of the grate can be set according to table 2.
TABLE 2
And (4) feeding the preheated green pellets into a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets.
Examples 2-10, and comparative examples the procedure was the same as in example 1, with the parameters shown in table 3 below.
TABLE 3
Through the examples and the comparative examples in the table 3, it can be found that the compressive strength and the grade of the finished ball are obviously improved by replacing 2% of bentonite with low-nickel high-iron nickel ore in the example 3 and the comparative example.
Along with the continuous adding and using of the low-nickel high-iron nickel ore, the compressive strength of finished balls is increased and is more than about 10%, the compressive strength is gradually reduced, the use is about 15%, the compressive strength of the balls is close to the low value required by charging, about 2000N/ball, meanwhile, the ring formation in a rotary kiln is increased, the smooth production is influenced, and the reasonable use range of the low-nickel high-iron nickel ore is within 15%.
All the percentages in the specification are mass percentages.
Claims (6)
1. A production method of pellets added with low-nickel high-iron nickel ore is characterized by sequentially comprising the following steps:
step (1), material preparation and mixing: mixing the low-nickel high-iron nickel ore and the iron concentrate powder, completely replacing bentonite with the low-nickel high-iron nickel ore, and performing drying and wet grinding pretreatment; the low-nickel high-iron nickel ore and the iron concentrate powder are proportioned according to mass fraction, and the raw materials comprise the following components: low-nickel high-iron nickel ore: 2% -15%, fine iron powder: 85-98 percent;
pelletizing in step (2): adding water into the mixture by using pelletizing equipment to pelletize the mixture into green pellets, and screening out qualified green pellets;
step (3), material distribution and drying preheating: conveying the qualified green pellets to a chain grate machine through a distributor, and drying and preheating;
roasting and cooling in the step (4): the preheated green pellets enter a rotary kiln and a circular cooler for high-temperature roasting cooling and further oxidation to prepare finished pellets;
the iron content of the low-nickel high-iron nickel ore is 45-50%, and the nickel content is less than 1%.
2. The method for producing the pellets added with the low-nickel high-iron nickel ore according to the claim 1, is characterized in that: in the step (1), the granularity requirement of the mixture is that the granules with the granularity less than or equal to 0.074mm are more than or equal to 75 percent.
3. The method for producing the pellets added with the low-nickel high-iron nickel ore according to the claim 1, is characterized in that: the pelletizing process in the step (2) is carried out in a pelletizing disc, the grain size composition is controlled in the pelletizing process, the green pellet granularity is required to be more than or equal to 85 percent within the range of 8-16mm, the falling strength of the green pellet is required to be more than or equal to 5 times per pellet, and the compressive strength is more than or equal to 10N per pellet; the addition amount of water is controlled, and the water content of the green ball is less than or equal to 8.7 percent.
4. The method for producing the pellets added with the low-nickel high-iron nickel ore according to the claim 1, is characterized in that: the distributing device in the step (3) comprises a large ball roller screen device and a small ball roller screen device, the conveyed raw balls are further classified through the large ball roller screen device and the small ball roller screen device, and the gap between the large roller screen device and the small roller screen device is adjusted, so that the proportion of the obtained raw balls with the granularity of 8-16mm is more than 85%.
5. The method for producing the pellets added with the low-nickel high-iron nickel ore according to the claim 1, is characterized in that: in the step (3), the drying and preheating are divided into a drying section and a preheating section, the temperature of the starting end of the drying section is 100 ℃, the temperature of the end point of the preheating section is 1050 ℃, the temperature is increased in a gradient manner, the machine speed of a chain grate machine is 1.5m/min, the strength of the preheated balls before entering the rotary kiln is more than or equal to 300N/ball, and the fracture ratio is less than 10%.
6. A production pellet formula added with low-nickel high-iron nickel ore is characterized in that the low-nickel high-iron nickel ore and iron concentrate powder are mixed, and the low-nickel high-iron nickel ore is used for completely replacing bentonite;
the low-nickel high-iron nickel ore and the iron concentrate powder are proportioned according to mass fraction, and the raw materials comprise the following components: low-nickel high-iron nickel ore: 2% -15%, fine iron powder: 85-98 percent;
the iron content of the low-nickel high-iron nickel ore is 45-50%, and the nickel content is less than 1%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010508181.4A CN113136486B (en) | 2020-06-05 | 2020-06-05 | Production method and formula of pellets added with low-nickel high-iron nickel ore |
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| CN202010508181.4A CN113136486B (en) | 2020-06-05 | 2020-06-05 | Production method and formula of pellets added with low-nickel high-iron nickel ore |
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| CN113136486B true CN113136486B (en) | 2022-09-02 |
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