CN113957240A - Preparation method of manganese-containing vanadium-titanium magnetite pellet - Google Patents
Preparation method of manganese-containing vanadium-titanium magnetite pellet Download PDFInfo
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- CN113957240A CN113957240A CN202111221535.8A CN202111221535A CN113957240A CN 113957240 A CN113957240 A CN 113957240A CN 202111221535 A CN202111221535 A CN 202111221535A CN 113957240 A CN113957240 A CN 113957240A
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- Prior art keywords
- manganese
- pellet
- magnetite
- vanadium titano
- containing vanadium
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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
- C22B1/14—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
- C22B1/242—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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
Abstract
The invention discloses a preparation method of manganese-containing vanadium titano-magnetite pellets, which belongs to the field of ferrous metallurgy and comprises the following steps: (1) preparing materials according to mass percent: adding manganese-containing substances into vanadium-titanium magnetite concentrate serving as a main raw material, and adding a binder accounting for 0.5-3% of the total amount; (2) mixing the vanadium-titanium magnetite concentrate, the manganese-containing substance and the binder uniformly to prepare green pellets; (3) drying and preheating the green pellets to obtain preheated pellets; (4) and roasting the preheated balls to obtain the manganese-containing vanadium-titanium magnetite pellets. After the manganese-containing substance is added, the compressive strength of the pellet is obviously improved, the required roasting temperature and roasting time are reduced, the reduction expansion rate is reduced, and the problems of high roasting temperature and low compressive strength of the finished pellet of the vanadium-titanium magnetite are solved.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to a preparation method of manganese-containing vanadium-titanium magnetite pellets.
Background
The Panxi area and the Chengdu area of China have very richRich vanadium titano-magnetite resource due to high TiO content2The blast furnace smelting technology is greatly different from common ores, and the phenomena of over-reduction of furnace slag, increased viscosity, difficult separation of slag and iron, high iron loss and the like are easily caused in the smelting process, so that the smelting technical indexes of the blast furnace are seriously influenced. Through technical research and attack for many years, the method adopts the control of the slag TiO2Content, oxygen enrichment operation, optimized charging, slag tapping and the like, and gradually solves the technical problem of blast furnace smelting.
The blast furnace adopts a reasonable furnace charge structure and can obtain the smelting effects of high yield, low consumption and long service life. The furnace burden structure adopted by the prior steel climbing blast furnace is high-alkalinity sinter ore (the alkalinity is 2.0-2.3) (the proportion is 60-70 percent) and acid oxidation pellet ore (the proportion is about 30 percent) and lump ore. Wherein, the production process of the high-alkalinity sinter needs to be added with common iron ore to reduce the TiO content in the slag of the blast furnace smelting process2And (4) content. Compared with the pelletizing process, the sintering production has the defects of high energy consumption, serious pollution, large three-waste discharge and the like. In addition, the vanadium-titanium sinter has poor strength and more powder, which affects the air permeability of the upper blocky band of the blast furnace, the lower soft melting band and the dropping band have large loss, the smelting pressure difference of the blast furnace is high, and the smelting index is always in a lower level. Therefore, the pellet production is cleaner than sintering production, and the proportion of pellets fed into the furnace is increased along with the strict requirement of environmental protection, so that the method has important significance for clean smelting of vanadium-titanium magnetite, improvement of blast furnace indexes and reduction of production cost.
The vanadium titano-magnetite pellet is obviously different from the common iron ore pellet due to the complex mineral composition of the vanadium titano-magnetite. Generally, the vanadium titano-magnetite pellets need higher roasting temperature, high pellet reduction expansion rate and low pellet compressive strength, which affects the large-scale application in blast furnaces.
The prior patent (CN104911342A) proposes a method for preparing boron-containing chromium-containing vanadium-titanium magnetite pellets, and B is added in the preparation of the pellets2O3As additive, it can improve the compression strength of pellet, but contains B2O3The vanadium titano-magnetite pellets have serious erosion effect on the blast furnace lining in blast furnace smelting, and in addition, the pellets are required to be 4-6 ℃ from 900 DEG CThe temperature is slowly increased to 1275 ℃ in min, the temperature rise time is long, and the production efficiency is low.
Disclosure of Invention
Aiming at the problems of high roasting temperature, low compressive strength of finished balls, high reduction expansion and the like of vanadium titano-magnetite pellets in the production process in the prior art, the invention aims to provide a preparation method of manganese-containing vanadium titano-magnetite pellets.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of manganese-containing vanadium titano-magnetite pellets comprises the following steps:
(1) preparing materials according to mass percent: adding manganese-containing substances into vanadium-titanium magnetite concentrate serving as a main raw material, and adding a binder accounting for 0.5-3% of the total amount;
(2) mixing the vanadium-titanium magnetite concentrate, the manganese-containing substance and the binder uniformly to prepare green pellets;
(3) drying and preheating the green pellets to obtain preheated pellets;
(4) and roasting the preheated balls to obtain the manganese-containing vanadium-titanium magnetite pellets.
In a preferable scheme, in the step (1), the mass percentage content of the vanadium-titanium magnetite concentrate with the granularity smaller than 200 meshes in the vanadium-titanium magnetite concentrate is more than or equal to 70%.
The preferable scheme is that in the step (1), TiO in the manganese-containing vanadium-titanium magnetite pellets is controlled2The content is 3.0-15%.
Preferably, in the step (1), the manganese-containing substance comprises one or more of manganese oxide, manganese carbonate and ferromanganese ore, and the MnO content in the manganese-containing vanadium titano-magnetite pellet is controlled to be 1.0-5.0%.
In a preferable scheme, in the step (1), the manganese-containing substance with the granularity smaller than 200 meshes is more than or equal to 80% in mass percentage.
Preferably, in the step (1), the binder is one or more of bentonite, an organic binder and a composite binder.
Preferably, in the step (2), the diameter of the green ball is 8-20 mm.
In a preferable scheme, in the step (3), the drying temperature is 200-500 ℃ and the time is 10-60 mm; the preheating temperature is 800-1050 ℃, and the time is 10-60 min.
In the preferable scheme, in the step (4), the roasting temperature is 1250-1350 ℃ and the roasting time is 8-60 min.
Preferably, in the step (4), the compressive strength of the manganese-containing vanadium-titanium magnetite pellet ore is more than 2500N/pellet ore.
The vanadium titano-magnetite ore has complex composition, compact structure and high melting point of titanium-containing ore, and has the problems of high roasting temperature, long roasting time, low compressive strength of roasted pellets, high reduction expansion rate of vanadium titano-magnetite pellets and the like in the roasting process of the pellets. After the manganese-containing substance is added, the manganese-containing substance can react with silicon, magnesium, aluminum and other substances in the pellets to generate a low-melting-point substance, so that the liquid phase generation in the pellet roasting process is promoted, and the continuous crystal growth and consolidation of iron oxides in the pellets are promoted, thereby effectively improving the pellet strength, and improving the pellet roasting performance and the metallurgical performance.
Drawings
FIG. 1 is a flow chart of the preparation method of the manganese-containing vanadium titano-magnetite pellet of the present invention.
Detailed Description
The following examples further illustrate embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
The invention relates to a preparation method of manganese-containing vanadium titano-magnetite pellets, which comprises the following steps:
vanadium-titanium magnetite concentrate is used as main raw material according to TiO in pellet2Adding vanadium-titanium magnetite concentrate with the content of 3-15%, adding manganese-containing substances according to the MnO content of 1-5 wt% in the pellet, adding 0.5-3 wt% of bentonite, uniformly mixing to obtain a mixture, pelletizing the mixture on a pelletizer, drying the prepared green pellets, and then carrying out measurement on the compression strength of the pellet ore on an intelligent pellet press with the KN of 10.0.
Comparative example 1
In the test of the raw ore pellets without the manganese-containing substance, the bentonite consumption is 1.5 percent, and the compressive strength of the finished product pellets is 1894N/P under the conditions of the preheating temperature of 920 ℃, the preheating time of 14min, the roasting temperature of 1200 ℃ and the roasting time of 10 min.
Comparative example 2
In the test of the raw ore pellets without the manganese-containing substance, the bentonite consumption is 1.5 percent, and the compressive strength of the finished product pellets is 2368N/P under the conditions of the preheating temperature of 950 ℃, the preheating time of 14min, the roasting temperature of 1250 ℃ and the roasting time of 10 min.
Comparative example 3
In the test of the raw ore pellets without the manganese-containing substance, the bentonite consumption is 1.5 percent, and the compressive strength of the finished product pellets is 2489N/P under the conditions of the preheating temperature of 950 ℃, the preheating time of 14min, the roasting temperature of 1300 ℃ and the roasting time of 10 min.
Comparative example 4
In the test of the raw ore pellets without the manganese-containing substance, the consumption of the bentonite is 1.5 percent, and the compressive strength of the finished product pellets is 2578N/P under the conditions of the preheating temperature of 950 ℃, the preheating time of 14min, the roasting temperature of 1300 ℃ and the roasting time of 12 min.
Comparative example 5
In the test of the raw ore pellets without the manganese-containing substance, the consumption of the bentonite is 1.5 percent, and the compressive strength of the finished product pellets is 2841N/P under the conditions of the preheating temperature of 950 ℃, the preheating time of 14min, the roasting temperature of 1300 ℃ and the roasting time of 14 min.
TABLE 1 statistical table of test results of comparative examples 1 to 5
As can be seen from the test results in Table 1, when no manganese-containing substance is added, the compression strength of the vanadium titano-magnetite pellets is low, and the vanadium titano-magnetite pellets can reach more than 2500N/P only under the conditions of higher roasting temperature and roasting time, which causes the energy consumption in production to be increased, the equipment loss to be increased, and the difficulty in production operation to be increased.
Example 1
The compressive strength of the finished ball is 2692N/P under the conditions of the preheating temperature of 900 ℃, the preheating time of 12min, the roasting temperature of 1300 ℃ and the roasting time of 10min according to the proportion of 1.0wt percent of MnO in the ball and the using amount of bentonite of 1.5 percent.
Example 2
The compressive strength of the finished product ball is 2920N/P under the conditions that the preheating temperature is 900 ℃, the preheating time is 12min, the roasting temperature is 1250 ℃, and the roasting time is 10min according to the ferromanganese ore which is added according to the MnO content of 3.0 wt% in the ball.
Example 3
The compressive strength of the finished pellet is 3225N/P under the conditions of the preheating temperature of 900 ℃, the preheating time of 14min, the roasting temperature of 1250 ℃ and the roasting time of 10min by adding manganese carbonate according to the MnO content of 5.0 wt% in the pellet and the bentonite using amount of 1.5%.
Example 4
The compressive strength of the finished pellet is 2842N/P under the conditions that the preheating temperature is 900 ℃, the preheating time is 14min, the roasting temperature is 1220 ℃ and the roasting time is 10min according to the manganese oxide added according to the MnO content of 5.0 wt% in the pellet.
Example 5
Manganese carbonate is added according to the MnO content of 5.0 wt% in the pellet, the bentonite consumption is 1.5%, and the compressive strength of the finished pellet is 2795N/P under the conditions of the preheating temperature of 900 ℃, the preheating time of 14min, the roasting temperature of 1250 ℃ and the roasting time of 8 min.
TABLE 2 statistical tables of test results of examples 1 to 5
The test result shows that after the manganese-containing substance is added, the compressive strength of the pellet is obviously improved, the roasting temperature and the roasting time are both reduced, the reduction expansion rate is reduced, and the problems of high roasting temperature and low compressive strength of the finished pellet of the vanadium-titanium magnetite are solved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. Modifications and variations that may occur to those skilled in the art without departing from the spirit and scope of the invention are to be considered as within the scope of the invention.
Claims (10)
1. The preparation method of the manganese-containing vanadium titano-magnetite pellet is characterized by comprising the following steps:
(1) preparing materials according to mass percent: adding manganese-containing substances into vanadium-titanium magnetite concentrate serving as a main raw material, and adding a binder accounting for 0.5-3% of the total amount;
(2) mixing the vanadium-titanium magnetite concentrate, the manganese-containing substance and the binder uniformly to prepare green pellets;
(3) drying and preheating the green pellets to obtain preheated pellets;
(4) and roasting the preheated balls to obtain the manganese-containing vanadium-titanium magnetite pellets.
2. The preparation method of the manganese-containing vanadium titano-magnetite pellet as claimed in claim 1, wherein in the step (1), the mass percentage content of vanadium titano-magnetite concentrate with a particle size of less than 200 meshes is not less than 70%.
3. The method for preparing the manganese-containing vanadium titano-magnetite pellet as claimed in claim 1, wherein in the step (1), TiO in the manganese-containing vanadium titano-magnetite pellet is controlled2The content is 3.0-15%.
4. The method for preparing the manganese-containing vanadium titano-magnetite pellet as claimed in claim 1, wherein in the step (1), the manganese-containing material comprises one or more of manganese oxide, manganese carbonate and ferromanganese ore, and the MnO content in the manganese-containing vanadium titano-magnetite pellet is controlled to be 1.0-5.0%.
5. The preparation method of the manganese-containing vanadium titano-magnetite pellet as claimed in claim 1, wherein in the step (1), the mass percentage of the manganese-containing substances with the particle size of less than 200 meshes is not less than 80%.
6. The method for preparing the manganese-containing vanadium titano-magnetite pellet as claimed in claim 1, wherein in the step (1), the binder is one or more of bentonite, organic binder and composite binder.
7. The method for preparing the manganese-containing vanadium titano-magnetite pellet as claimed in claim 1, wherein in the step (2), the diameter of the green pellet is 8-20 mm.
8. The method for preparing the manganese-containing vanadium titano-magnetite pellet as claimed in claim 1, wherein in the step (3), the drying temperature is 200-500 ℃ and the drying time is 10-60 mm; the preheating temperature is 800-1050 ℃, and the time is 10-60 min.
9. The method for preparing the manganese-containing vanadium titano-magnetite pellet as claimed in claim 1, wherein in the step (4), the roasting temperature is 1250-1350 ℃ and the roasting time is 8-60 min.
10. The method for preparing the manganese-containing vanadium titano-magnetite pellet as claimed in claim 1, wherein in the step (4), the compressive strength of the manganese-containing vanadium titano-magnetite pellet is more than 2500N/pellet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032387A (en) * | 2022-01-10 | 2022-02-11 | 华北理工大学 | Additive for reducing roasting temperature of fluxed magnetite pellets and use method thereof |
| US11891677B2 (en) | 2022-01-10 | 2024-02-06 | North China University Of Science And Technology | Additive for reducing the roasting temperature of fluxed magnetite pellets and a method of using it |
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2021
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032387A (en) * | 2022-01-10 | 2022-02-11 | 华北理工大学 | Additive for reducing roasting temperature of fluxed magnetite pellets and use method thereof |
| CN114032387B (en) * | 2022-01-10 | 2022-04-01 | 华北理工大学 | Additive for reducing roasting temperature of fluxed magnetite pellets and use method thereof |
| WO2023130784A1 (en) * | 2022-01-10 | 2023-07-13 | 华北理工大学 | Additive for reducing roasting temperature of fluxed magnetite pellets and use method |
| US11891677B2 (en) | 2022-01-10 | 2024-02-06 | North China University Of Science And Technology | Additive for reducing the roasting temperature of fluxed magnetite pellets and a method of using it |
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