CN111575479B - Method for producing oxidized pellet by specularite - Google Patents

Method for producing oxidized pellet by specularite Download PDF

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CN111575479B
CN111575479B CN202010645043.0A CN202010645043A CN111575479B CN 111575479 B CN111575479 B CN 111575479B CN 202010645043 A CN202010645043 A CN 202010645043A CN 111575479 B CN111575479 B CN 111575479B
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specularite
ball
equal
magnetite
preheating
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CN111575479A (en
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孟光栋
刘庆华
徐沈
闫文光
李伟进
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MCC North Dalian Engineering Technology Co Ltd
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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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic

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Abstract

The invention discloses a method for producing oxidized pellets by specularite, which is characterized by comprising the following steps: 1) preparing raw materials, the specific surface area is more than or equal to 1200cm2Specularite/g, specific surface area not less than 1400cm2Magnetite per gram, sintered return ores with the content of-200 meshes being more than or equal to 85 percent and composite bentonite; 2) proportioning and pelletizing, namely proportioning 80% of specularite, 10-20% of magnetite, 7-10% of sintered return ore and 1.5-2.0% of composite bentonite according to the weight proportion of dry materials; preparing a green ball; 3) preheating and roasting at 950-980 ℃ for 10min, at 1200-1250 ℃ for 10min to obtain roasted balls with the compressive strength of more than or equal to 2300N/ball. The invention has the advantages that: the specific surface area of the specularite is relatively low, and the proportion reaches 80 percent; the preheating roasting temperature and time are relatively low and short, and the energy is saved and the consumption is reduced.

Description

Method for producing oxidized pellet by specularite
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for producing oxidized pellets by specularite.
Background
With the rapid development of the iron ore oxidized pellet process in China, the supply of magnetite resources with high iron grade and excellent roasting performance is increasingly tense, so that the development and application of new iron ore resources become a new way for promoting the continuous development of the iron and steel industry in China. In order to reduce the production cost and comply with the development direction of the blast furnace concentrate guideline, more and more iron and steel enterprises are trying to add specularite to the raw materials to produce pellets. Specularite, as an iron ore, has the advantages of high iron grade, less harmful impurities, large existing reserves and relatively low price, thus causing wide attention in the steel industry. However, the specularite has good crystal size, smooth particle surface and compact structure, so that the hydrophilicity and balling performance of the specularite are poor, and the balling is difficult. Meanwhile, because the high-temperature reaction performance of the specularite is poor, recrystallization interconnection among low-melting-point compounds or particles is difficult to form, so that the preheating temperature and the roasting temperature of the specularite pellets are both higher. Due to the defects, specularite still cannot be applied to the pellet industry in a large proportion at present.
In order to effectively utilize specularite resources, domestic scientific research institutes and research institutions also carry out a great deal of research on how to use specularite to produce oxidized pellets. As mentioned in the way of the university of China and south, specularite is pretreated, and when the specific surface area of the specularite reaches 1600cm2/g, special binder MHA with the concentration of 1.0% is adopted for balling, and the balling index can basically meet the production requirement. In the article for commenting the current situation and development trend of the specularite for sintering pellet production, the professor of the university of the south and the middle schools mentions that the strengthening measures for the specularite in the pellet production are high-quality and high-efficiency bonding, production of fluxing pellets, batch fuel feeding, mechanical activation and the like, and various strengthening measures can be comprehensively applied in field production to achieve the purpose of improving the pelletizing effect. However, the above researchers all mention that the addition amount of specularite in the pellet ore cannot exceed 20%. In order to improve the use proportion of specularite, the Tangyanyun of the university of Zhongnan also researches on strengthening the Brazilian specularite pellets by adopting a high-pressure roller milling process, and the result shows that the blending amount of the specularite can reach 70% through mechanical activation when the specularite and the magnetite are mixed for use. The study also indicates that the preheating temperature of the pellets after mechanical activation is still above 1000 ℃. The technical problem of preparing pellets by using single Brazilian specularite is solved by adding the iron-containing miscellaneous materials and limestone mud cakes in the Brazilian specularite and carrying out wet grinding on the mixture, and the research has clear requirements on the properties of the raw materials, and the preheating time and the roasting time are both 15 min.
Some patents also describe the preparation of pellets from specularite, for example, patent No. CN201610056164.5 discloses a roasting method of high proportion specularite, in which the specularite is rolled under high pressure to reach a specific surface area of 2000cm2The blending amount of the specularite can reach 60% -75%, but the preheating temperature of the pellets is still high and is 1100-1180 ℃. Such as patent publication No. CN200810197952.1A pellet of specularite and its smelting method features that the Raymond mill is used to treat specularite, but the preparing process and thermal regulation of the pellet are not defined.
Significant research efforts are also required for the efficient use of specularite in pellet production.
Disclosure of Invention
The invention aims to provide a method for producing oxidized pellets by specularite.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a method for producing oxidized pellet by specularite, which is characterized by comprising the following steps:
step one, raw material preparation
The raw materials comprise specularite, magnetite, sintered return ores and composite bentonite;
crushing specularite raw materials by a high-pressure roller mill to ensure that the specific surface area of the specularite is more than or equal to 1200cm2/g；
Finely grinding the sintered return fine raw material with the alkalinity of 1.82.0 by a ball mill until the content of-200 meshes is more than or equal to 85 percent;
the magnetite raw material is magnetite concentrate with specific surface area not less than 1400cm2/g；
Step two, batching and balling
And (3) blending the specularite, the magnetite, the sintered return ores and the composite bentonite obtained in the step one according to the weight proportion of dry materials, wherein the specularite accounts for 80%, the magnetite accounts for 10% -20%, the sintered return ores account for 7% -10%, and the composite bentonite accounts for 1.5% -2.0%. Adding water, mixing uniformly, and balling on a disc pelletizer to obtain green pellets used in the test;
step three, preheating and roasting
Drying the green pellets obtained in the step two, preheating and roasting the dried green pellets on a horizontal tube furnace, and obtaining preheated pellets under the conditions that the preheating temperature is 950-980 ℃ and the preheating time is 10 min; and then the preheated balls are roasted at the roasting temperature of 1200-1250 ℃ for 10min to obtain the roasted balls.
In step two, the green ball has the following strength parameters: the falling strength is more than or equal to 5.0 times per ball, and the compressive strength is more than or equal to 9.8N per ball.
In the third step, the preheating balls have the compressive strength of more than or equal to 500N/ball, and the roasting balls have the compressive strength of more than or equal to 2300N/ball.
Compared with the prior art, the invention has the advantages that:
1. the specular hematite used in the invention has relatively low specific surface area;
2. the blending proportion of specularite is larger and reaches 80 percent;
3. when the compressive strength of the preheating ball is more than or equal to 500N/ball, the preheating temperature is 950-980 ℃, the preheating time is 10min, the preheating temperature is relatively low, the preheating time is relatively short, and the energy is saved and the consumption is reduced;
4. when the compressive strength of the roasted balls is more than or equal to 2300N/ball, the roasting temperature is 1200-1250 ℃, the roasting time is 10min, the roasting temperature is relatively low, the roasting time is relatively short, and the energy is saved and the consumption is reduced;
5. the raw materials matched with specularite in the invention are common and easy to obtain.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will now be further illustrated with reference to fig. 1 and the examples.
Example 1.
Step one, raw material preparation
The main chemical composition of the feedstock of example 1 is shown in table 1:
TABLE 1, EXAMPLE 1 Main chemical composition of the raw materials used
Figure 200862DEST_PATH_IMAGE001
The specularite is crushed by the high-pressure roller mill, and the specific surface area is increased to 1210cm2Per g, the specific surface area of magnetite is 1470cm2The sintered return ores are finely ground by a ball mill until the granularity is-200 meshes and the content accounts for 88 percent;
step two, batching and balling
The specularite, the magnetite and the sintered return ore are mixed by adding water and mixing uniformly according to 80 percent of specularite, 10 percent of magnetite, 8 percent of sintered return ore and 2.0 percent of composite bentonite for ore blending and pelletizing, and then pelletizing on a disc pelletizer to obtain green pellets used in the test; the dropping strength of the obtained green ball is 5.2 times per ball, and the compressive strength of the green ball is 12.0N per ball;
step three, preheating and roasting
After drying the green pellets, preheating and roasting the green pellets on a horizontal tube furnace to obtain preheated pellets under the conditions that the preheating temperature is 980 ℃ and the preheating time is 10 min; then the preheated balls are roasted at the roasting temperature of 1250 ℃ for 10min to obtain roasted balls, and the compression strength of the roasted balls is 3008N/ball.
Example 2.
Step one, raw material preparation
Example 2 the main chemical composition of the feedstock is shown in table 2:
TABLE 2, EXAMPLE 2 Main chemical composition of the raw materials used
Figure 540707DEST_PATH_IMAGE002
Crushing specularite by high pressure roller mill until the specific surface area is increased to 1230cm2G, the specific surface area of magnetite is 1550cm2The sintered return ores are finely ground by a ball mill until the granularity is-200 meshes and the content accounts for 90 percent;
step two, batching and balling
Mixing specularite, magnetite and sintered return ore according to 80% of specularite, 12.5% of magnetite, 6% of sintered return ore and 1.5% of composite bentonite, adding water, mixing uniformly, and pelletizing on a disc pelletizer to obtain green pellets used in the test; the dropping strength of the obtained green ball is 5.2 times per ball, and the compressive strength of the green ball is 12.0N per ball;
step three, preheating and roasting
After drying the green pellets, preheating and roasting the green pellets on a horizontal tube furnace to obtain preheated pellets under the conditions that the preheating temperature is 980 ℃ and the preheating time is 10 min; then the preheated balls are roasted at the roasting temperature of 1250 ℃ for 10min to obtain the roasted balls, and the compression strength of the roasted balls is 3220N per ball.
Example 3.
Step one, raw material preparation
Example 3 the main chemical composition of the feedstock is shown in table 3:
table 3, example 3 main chemical composition of raw material
Figure 285285DEST_PATH_IMAGE003
The specularite is crushed by a high-pressure roller mill, and the specific surface area is increased to 1280cm2Per g, magnetite specific surface area 1610cm2The sintered return ores are finely ground by a ball mill until the granularity is-200 meshes and the content accounts for 85 percent;
step two, batching and balling
Adding water into specularite, magnetite and sintered return ore, uniformly mixing 80% of specularite, 8.2% of magnetite, 10% of sintered return ore and 1.8% of composite bentonite, and pelletizing on a disc pelletizer to obtain green pellets used in the test; the dropping strength of the obtained green ball is 5.6 times per ball, and the compressive strength of the green ball is 14.0N per ball;
step three, preheating and roasting
After drying the green pellets, preheating and roasting the green pellets on a horizontal tube furnace to obtain preheated pellets under the conditions that the preheating temperature is 950 ℃ and the preheating time is 10 min; then the pre-heating ball is roasted at the roasting temperature of 1220 ℃ for 10min to obtain the roasted ball, and the compression strength of the roasted ball is 2610N per ball.
Example 4.
Step one, raw material preparation
Example 4 the main chemical composition of the feedstock is shown in table 4:
table 4, example 4 main chemical composition of raw material
Figure 357277DEST_PATH_IMAGE004
Mirror ironThe ore is crushed by the high-pressure roller mill, and the specific surface area is increased to 1280cm2Per g, magnetite specific surface area 1520cm2The sintered return ores are finely ground by a ball mill until the granularity is-200 meshes and the content accounts for 90 percent;
step two, batching and balling
The specularite, the magnetite and the sintered return ore are mixed by adding water and mixing uniformly according to 80 percent of specularite, 11.5 percent of magnetite, 7 percent of sintered return ore and 1.5 percent of composite bentonite for ore blending and pelletizing, and then pelletizing on a disc pelletizer to obtain green pellets used in the test; the dropping strength of the obtained green ball is 5.1 times per ball, and the compressive strength of the green ball is 13.2N per ball;
step three, preheating and roasting
After drying the green pellets, preheating and roasting the green pellets on a horizontal tube furnace to obtain preheated pellets under the conditions that the preheating temperature is 980 ℃ and the preheating time is 10 min; then the roasted balls are obtained by preheating the balls under the conditions that the roasting temperature is 1200 ℃ and the roasting time is 10min, and the compression strength of the roasted balls is 2389N/ball.

Claims (1)

1. A method for producing oxidized pellet ore by adopting specularite is characterized by comprising the following steps:
step one, raw material preparation
The raw materials comprise specularite, magnetite, sintered return ores and composite bentonite;
crushing specularite raw materials by a high-pressure roller mill to ensure that the specific surface area of the specularite is more than or equal to 1200cm2/g；
Finely grinding the sintering return fine raw material with the alkalinity of 1.8-2.0 by using a ball mill until the content of-200 meshes is more than or equal to 85 percent;
the magnetite raw material is magnetite concentrate with specific surface area not less than 1400cm2/g；
Step two, batching and balling
Proportioning the specularite, the magnetite, the sintering return ores and the composite bentonite obtained in the step one according to the weight proportion of dry materials, wherein 80% of the specularite, 10-20% of the magnetite, 7-10% of the sintering return ores and 1.5-2.0% of the composite bentonite are uniformly mixed with water and then are pelletized on a disc pelletizer to obtain the green pellets used for the test, and the green pellets have the following strength parameters: the falling strength is more than or equal to 5.0 times per ball, and the compressive strength is more than or equal to 9.8N per ball;
step three, preheating and roasting
Drying the green pellets obtained in the step two, preheating and roasting the dried green pellets on a horizontal tube furnace, and obtaining preheated pellets under the conditions that the preheating temperature is 950-980 ℃ and the preheating time is 10 min; and then roasting the balls at the roasting temperature of 1200-1250 ℃ for 10min to obtain roasted balls, wherein the preheated balls have the compressive strength of more than or equal to 500N/ball, and the roasted balls have the compressive strength of more than or equal to 2300N/ball.
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CN114891999B (en) * 2022-05-16 2024-06-28 唐山钢铁集团有限责任公司 Ore proportioning method for producing alkaline pellets by belt type roasting machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465510A (en) * 1983-06-20 1984-08-14 Queen's University At Kingston Agglomeration of iron ores and concentrates
CN101570821A (en) * 2009-06-15 2009-11-04 中南大学 Sintering method of high proportion specularite concentrate
CN101643835A (en) * 2009-09-02 2010-02-10 中南大学 Method for improving pelletization in iron ore concentrate pretreatment
CN102417976A (en) * 2011-11-16 2012-04-18 中南大学 Method for preparing oxidated pellets from pure hematite concentrate
CN105525091A (en) * 2016-01-28 2016-04-27 太原钢铁(集团)有限公司 Roasting method of high-portion specularite

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465510A (en) * 1983-06-20 1984-08-14 Queen's University At Kingston Agglomeration of iron ores and concentrates
CN101570821A (en) * 2009-06-15 2009-11-04 中南大学 Sintering method of high proportion specularite concentrate
CN101643835A (en) * 2009-09-02 2010-02-10 中南大学 Method for improving pelletization in iron ore concentrate pretreatment
CN102417976A (en) * 2011-11-16 2012-04-18 中南大学 Method for preparing oxidated pellets from pure hematite concentrate
CN105525091A (en) * 2016-01-28 2016-04-27 太原钢铁(集团)有限公司 Roasting method of high-portion specularite

Non-Patent Citations (1)

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Title
巴西镜铁矿球团前的高压辊磨预处理;朱德庆等;《金属矿山》;20081231(第4期);第67-70、92页 *

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