CN114836616A - Iron ore powder pellet and preparation method thereof - Google Patents

Iron ore powder pellet and preparation method thereof Download PDF

Info

Publication number
CN114836616A
CN114836616A CN202210339740.2A CN202210339740A CN114836616A CN 114836616 A CN114836616 A CN 114836616A CN 202210339740 A CN202210339740 A CN 202210339740A CN 114836616 A CN114836616 A CN 114836616A
Authority
CN
China
Prior art keywords
iron ore
ore powder
pellets
roasting
powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202210339740.2A
Other languages
Chinese (zh)
Other versions
CN114836616B (en
Inventor
范建军
李昊堃
史永林
刘文文
何雷利
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanxi Taigang Stainless Steel Co Ltd
Original Assignee
Shanxi Taigang Stainless Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanxi Taigang Stainless Steel Co Ltd filed Critical Shanxi Taigang Stainless Steel Co Ltd
Priority to CN202210339740.2A priority Critical patent/CN114836616B/en
Publication of CN114836616A publication Critical patent/CN114836616A/en
Application granted granted Critical
Publication of CN114836616B publication Critical patent/CN114836616B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/02Roasting processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/2406Binding; Briquetting ; Granulating pelletizing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/242Binding; Briquetting ; Granulating with binders
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/242Binding; Briquetting ; Granulating with binders
    • C22B1/243Binding; Briquetting ; Granulating with binders inorganic
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention belongs to the technical field of pellet preparation, and particularly relates to iron ore powder pellets and a preparation method thereof. The preparation method of the iron ore powder pellet comprises the following steps: (1) feeding iron ore powder into a rotary kiln for roasting; (2) carrying out wet grinding on the roasted iron ore powder and the slaked lime by using a wet grinding machine to obtain a mixture; (3) adding a binder into the mixture, and pelletizing to obtain green pellets; (4) and preheating and roasting the green pellets to obtain iron ore powder pellets. According to the invention, iron ore powder (especially iron ore powder with high sulfur content) is added into a rotary kiln for high-temperature roasting, and the green pellets are prepared after wet grinding pretreatment, so that the bursting proportion of the green pellets in the preheating roasting process can be reduced.

Description

Iron ore powder pellet and preparation method thereof
Technical Field
The invention belongs to the technical field of pellet preparation, and particularly relates to iron ore powder pellets and a preparation method thereof.
Background
The iron ore concentrate is a main iron material for producing the pellet, the iron ore concentrate is prepared by deeply processing original ore through the working procedures of crushing, fine grinding, magnetic separation or flotation and the like, and the produced iron ore powder has larger component difference due to different components of the original ore, so the performance of the green pellet is larger after pelletizing. After the iron ore concentrate powder with high sulfur content is pelletized, the green pellets are easy to crack in the preheating and roasting processes, a large amount of powder is produced, the quality of the green pellets is deteriorated, and the normal production is not facilitated.
Therefore, whether to develop a method for improving the performance of green pellets with high sulfur content will be beneficial to the improvement of the quality of the green pellets.
Disclosure of Invention
The invention aims to provide iron ore powder pellets and a preparation method thereof aiming at the defects of the prior art.
In a first aspect, the present invention provides a method for preparing iron ore powder pellets, comprising:
(1) feeding iron ore powder into a rotary kiln for roasting;
(2) carrying out wet grinding on the roasted iron ore powder and the slaked lime by using a wet grinding machine to obtain a mixture;
(3) adding a binder into the mixture, and pelletizing to obtain green pellets;
(4) and preheating and roasting the green pellets to obtain iron ore powder pellets.
According to the preparation method of the iron ore powder pellet, the iron ore powder comprises the following components in percentage by weight: TFe 62-66%, CaO 0.3-0.8%, SiO 2 5.8%-8.3%,MgO 0.3%-0.8%,Al 2 O 3 0.5%-0.7%,S 0.3%-0.7%。
According to the preparation method of the iron ore powder pellet, the iron ore powder is mountain Xidai county ore powder, wherein the proportion of the iron ore powder with the particle size of less than 0.044mm is more than 75%.
In the preparation method of the iron ore powder pellet, in the step (1), the roasting temperature is 650-.
According to the preparation method of the iron ore powder pellet, the weight ratio of the iron ore powder to the stone-removing ash is 85-93: 7-15.
According to the preparation method of the iron ore powder pellets, the water content in the mixture is 7-8.5 wt%.
According to the preparation method of the iron ore powder pellet, the duration of the wet grinding is more than 15 minutes.
According to the preparation method of the iron ore powder pellet, the particle size of the green pellet is 8-16 mm.
According to the preparation method of the iron ore powder pellet, the bursting proportion of the green pellets is less than 15%.
On the other hand, the invention also provides iron ore powder pellets which are prepared by the preparation method of the iron ore powder pellets.
The technical scheme of the invention has the following beneficial effects:
the method for preparing the iron ore powder pellets can improve the cracking of green pellets prepared from the iron ore powder with high sulfur content in the preheating and roasting processes and improve the quality of the green pellets.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The terms "the," "said," "an," and "an" as used herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. The terms "preferred", "more preferred", and the like, refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.
In order to improve cracking of green pellets prepared from iron ore powder with high sulfur content in the preheating and roasting processes and improve green pellet quality, the invention provides a preparation method of iron ore powder pellets, which comprises the following steps:
(1) feeding iron ore powder into a rotary kiln for roasting;
(2) carrying out wet grinding on the roasted iron ore powder and the slaked lime by using a wet grinding machine to obtain a mixture;
(3) adding a binder into the mixture, and pelletizing to obtain green pellets;
(4) and preheating and roasting the green pellets to obtain iron ore powder pellets.
According to the preparation method of the iron ore powder pellet, the iron ore powder (particularly the iron ore powder with high sulfur content) is added into the rotary kiln for high-temperature roasting, and the green pellet is prepared after wet grinding pretreatment, so that the bursting proportion of the green pellet in the preheating roasting process can be reduced.
In some preferred embodiments, the method for preparing iron ore powder pellets according to the present invention comprises:
(1) feeding the iron ore powder into a rotary kiln for roasting.
Preferably, the iron ore powder is iron ore powder with high sulfur content, and comprises the following components in percentage by weight: 62 to 66 percent of TFe, 0.3 to 0.8 percent of CaO, and SiO 2 5.8%-8.3%,MgO 0.3%-0.8%,Al 2 O 3 0.5%-0.7%,S 0.3%-0.7%。
Further preferably, the iron ore powder is mountain Xidai county ore powder, wherein the proportion of the particle size of less than 0.044mm is more than 75%.
Wherein, high-temperature flue gas is adopted to roast the iron ore powder in a rotary kiln.
Preferably, the roasting temperature is 650-800 ℃, and the roasting time is more than 25 minutes.
In a preferred embodiment, the iron ore powder with high sulfur content is roasted in a rotary kiln by high-temperature flue gas, the temperature is 700 ℃, and the roasting time of the iron ore powder is 32 minutes.
In a further preferred embodiment, the ore dust with a high sulphur content is roasted in a rotary kiln with high temperature flue gas at 720 ℃ for 35 minutes.
In a further preferred embodiment, the ore dust with a high sulphur content is roasted in the rotary kiln with high temperature flue gas at 750 ℃ for 38 minutes.
In a further preferred embodiment, the ore dust with a high sulphur content is roasted in the rotary kiln with high temperature flue gas at 780 ℃ for 43 minutes.
(2) And (4) carrying out wet grinding on the roasted iron ore powder and the slaked lime by using a wet grinding machine to obtain a mixture.
Preferably, the weight ratio of the iron ore powder to the stone-removing ash is 85-93: 7-15, preferably 89: 11.
Preferably, the water content in the mixture is 7-8.5 wt%.
Further preferably, the length of the wet-grinding is more than 15 minutes, preferably 18 minutes.
The invention adopts the wet grinding machine to carry out wet grinding on the iron ore powder and the slaked lime in the proportion for more than 15 minutes, so that the materials can be fully mixed and refined, and the surface area and the green ball strength of the material particles are increased.
(3) And adding a binder into the mixture, and pelletizing to obtain green pellets.
Preferably, the particle size of the green pellets is 8-16 mm.
Optionally, the binder is bentonite.
Wherein the weight ratio of the mixture to the binder is 98.5: 1.5.
(4) And preheating and roasting the green pellets to obtain iron ore powder pellets.
Preferably, the green pellets are preheated and roasted by a chain grate machine.
Practice proves that when the green pellets are preheated and roasted, the bursting proportion of the green pellets is less than 15 percent, and compared with the prior art, the cracking proportion is effectively reduced.
On the other hand, the invention provides iron ore powder pellets, which are prepared by the preparation method of the iron ore powder pellets.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions.
Reference example
Firstly, a green ball prepared by conventional mineral powder with high sulfur content is provided.
The specific production steps are as follows:
(1) ingredients
The iron ore powder and the bentonite are mixed according to the following weight percentage:
97.5 parts of iron ore powder,
1.2 parts of bentonite, namely 1.2 parts of bentonite,
wherein the iron ore powder is mountain west Dai county ore powder, and the chemical components are as follows: 65.2% of TFe, 0.47% of CaO, and SiO 2 =7.1%,MgO=0.42%,Al 2 O 3 0.63% and 0.64% and the proportion of particles with a size of less than 0.044mm in the composition is 82.3%.
(2) Pelletizing
The components are mixed evenly and then added into a disc pelletizer for pelletizing to produce pellets, and green pellets with the water content of 9.1 percent (by weight percent) are obtained, and the average grain diameter is 8-16 mm.
(3) Preheating roasting
The green pellets are distributed on a chain grate machine for preheating roasting, and the bursting proportion of the green pellets is 18.6 percent.
The reference example shows that green pellets prepared from mineral powder with high sulfur content are easy to crack when the green pellets are preheated and roasted on a chain grate machine.
The following examples further illustrate embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
Example 1
In this embodiment, iron ore powder is added into a rotary kiln, high-temperature flue gas is introduced for roasting, then the roasted ore powder and slaked lime are mixed uniformly, and added into a moistening and grinding machine for moistening and grinding, and then ingredients are added for pelletizing.
The specific steps are characterized as follows:
preparing mineral powder: adding iron ore powder with high sulfur content into the rotary kiln. Wherein the iron ore powder is mountain west Dai county ore powder, and the chemical components are as follows: 65.2% of TFe, 0.47% of CaO, and SiO 2 =7.1%,MgO=0.42%,Al 2 O 3 0.63% and 0.64% and the proportion of particles with a size of less than 0.044mm in the composition is 82.3%.
(2) Roasting mineral powder: adding iron ore powder into a rotary kiln, introducing high-temperature flue gas for roasting, wherein the temperature of the flue gas is 680 ℃, and the roasting time of the iron ore powder is 28 minutes.
(3) Mineral powder wet grinding pretreatment: and (3) uniformly mixing the roasted mineral powder and slaked lime, and adding the mixture into a moistening and grinding machine for moistening and grinding, wherein the water content of the mixture is 7.8%, and the moistening and grinding time is 18 minutes.
The iron ore powder and the slaked lime are mixed according to the following weight percentage:
92 parts of iron ore powder and 8 parts of slaked lime.
(4) Preparing ingredients: and (3) mixing the wet-milled mixed mineral powder with bentonite to obtain a pelletizing raw material.
The mixed iron ore powder and the bentonite are mixed according to the following weight percentage:
98.5 parts of mixed iron ore powder and 1.5 parts of bentonite.
(5) Pelletizing: adding the raw materials into a disc pelletizer to obtain green pellets with the diameter of 8-16 mm.
(6) Preheating and roasting: the green pellets are distributed on a chain grate machine for preheating roasting, and the bursting proportion of the green pellets is less than 14.1 percent.
Example 2
In the embodiment, the temperature of the high-temperature flue gas introduced into the rotary kiln is increased from 680 ℃ to 700 ℃, and the roasting time is also prolonged to 32 minutes.
The specific steps are characterized as follows:
(1) preparing mineral powder: adding iron ore powder with high sulfur content into the rotary kiln. Wherein the iron ore powder is mountain west Dai county ore powder, and the chemical components are as follows: 65.2% of TFe, 0.47% of CaO, and SiO 2 =7.1%,MgO=0.42%,Al 2 O 3 0.63% and 0.64% and the proportion of particles with a size of less than 0.044mm in the composition is 82.3%.
(2) Roasting mineral powder: adding iron ore powder into a rotary kiln, introducing high-temperature flue gas for roasting, wherein the temperature of the flue gas is 700 ℃, and the roasting time of the iron ore powder is 32 minutes.
(3) Mineral powder wet grinding pretreatment: and (3) uniformly mixing the roasted mineral powder and slaked lime, and adding the mixture into a moistening and grinding machine for moistening and grinding, wherein the water content of the mixture is 7.8%, and the moistening and grinding time is 18 minutes.
The iron ore powder and the slaked lime are mixed according to the following weight percentage:
92 parts of iron ore powder and 8 parts of slaked lime.
(4) Preparing ingredients: and (3) mixing the wet-milled mixed mineral powder with bentonite to obtain a pelletizing raw material.
The mixed iron ore powder and the bentonite are mixed according to the following weight percentage:
98.5 parts of mixed iron ore powder and 1.5 parts of bentonite.
(5) Pelletizing: adding the raw materials into a disc pelletizer to obtain green pellets with the diameter of 8-16 mm.
(6) Preheating and roasting: the green pellets are distributed on a chain grate machine for preheating roasting, and the bursting proportion of the green pellets is less than 13.2 percent.
Example 3
In the embodiment, the temperature of the high-temperature flue gas introduced into the rotary kiln is increased from 680 ℃ to 720 ℃, and the roasting time is also prolonged to 35 minutes.
The specific steps are characterized as follows:
(1) preparing mineral powder: adding iron ore powder with high sulfur content into the rotary kiln. Wherein the iron ore powder is mountain west Dai county ore powder, and the chemical components are as follows: 65.2% of TFe, 0.47% of CaO, and SiO 2 =7.1%,MgO=0.42%,Al 2 O 3 0.63% and 0.64% of S, less than the grain sizeThe proportion of 0.044mm is more than 82.3%.
(2) Roasting mineral powder: adding iron ore powder into a rotary kiln, introducing high-temperature flue gas for roasting, wherein the temperature of the flue gas is 720 ℃, and the roasting time of the iron ore powder is 35 minutes.
(3) Mineral powder wet grinding pretreatment: and (3) uniformly mixing the roasted mineral powder and slaked lime, and adding the mixture into a moistening and grinding machine for moistening and grinding, wherein the water content of the mixture is 7.8%, and the moistening and grinding time is 18 minutes.
The iron ore powder and the slaked lime are mixed according to the following weight percentage:
92 parts of iron ore powder and 8 parts of slaked lime.
(4) Preparing ingredients: and (3) mixing the wet-milled mixed mineral powder with bentonite to obtain a pelletizing raw material.
The mixed iron ore powder and the bentonite are mixed according to the following weight percentage:
98.5 parts of mixed iron ore powder and 1.5 parts of bentonite.
(5) Pelletizing: adding the raw materials into a disc pelletizer to obtain green pellets with the diameter of 8-16 mm.
(6) Preheating and roasting: the green pellets are distributed on a chain grate machine for preheating roasting, and the bursting proportion of the green pellets is less than 12.3 percent.
Example 4
In the embodiment, the temperature of the high-temperature flue gas introduced into the rotary kiln is increased from 680 ℃ to 750 ℃, and the roasting time is prolonged to 38 minutes.
The specific steps are characterized as follows:
(1) preparing mineral powder: adding iron ore powder with high sulfur content into the rotary kiln. Wherein the iron ore powder is mountain west Dai county ore powder, and the chemical components are as follows: 65.2% of TFe, 0.47% of CaO, and SiO 2 =7.1%,MgO=0.42%,Al 2 O 3 0.63% and 0.64% and the proportion of the grain size composition smaller than 0.044mm is greater than 82.3%.
(2) Roasting mineral powder: adding iron ore powder into a rotary kiln, introducing high-temperature flue gas for roasting, wherein the temperature of the flue gas is 750 ℃, and the roasting time of the iron ore powder is 38 minutes.
(3) Mineral powder wet grinding pretreatment: and (3) uniformly mixing the roasted mineral powder and slaked lime, and adding the mixture into a moistening and grinding machine for moistening and grinding, wherein the water content of the mixture is 7.8%, and the moistening and grinding time is 18 minutes.
The iron ore powder and the slaked lime are mixed according to the following weight percentage:
92 parts of iron ore powder and 8 parts of slaked lime.
(4) Preparing ingredients: and (3) mixing the wet-milled mixed mineral powder with bentonite to obtain a pelletizing raw material.
The mixed iron ore powder and the bentonite are mixed according to the following weight percentage:
98.5 parts of mixed iron ore powder and 1.5 parts of bentonite.
(5) Pelletizing: adding the raw materials into a disc pelletizer to obtain green pellets with the diameter of 8-16 mm.
(6) Preheating and roasting: the green pellets are distributed on a chain grate machine for preheating roasting, and the bursting proportion of the green pellets is less than 11.0 percent.
Example 5
In the embodiment, the temperature of the high-temperature flue gas introduced into the rotary kiln is increased from 680 ℃ to 780 ℃, and the roasting time is prolonged to 43 minutes.
The specific steps are characterized as follows:
(1) preparing mineral powder: adding iron ore powder with high sulfur content into the rotary kiln. Wherein the iron ore powder is mountain west Dai county ore powder, and the chemical components are as follows: 65.2% of TFe, 0.47% of CaO, and SiO 2 =7.1%,MgO=0.42%,Al 2 O 3 0.63% and 0.64% and the proportion of the grain size composition smaller than 0.044mm is greater than 82.3%.
(2) Roasting mineral powder: adding iron ore powder into a rotary kiln, introducing high-temperature flue gas for roasting, wherein the temperature of the flue gas is 780 ℃, and the roasting time of the iron ore powder is 43 minutes.
(3) Mineral powder wet grinding pretreatment: and (3) uniformly mixing the roasted mineral powder and slaked lime, and adding the mixture into a moistening and grinding machine for moistening and grinding, wherein the water content of the mixture is 7.8%, and the moistening and grinding time is 18 minutes.
The iron ore powder and the slaked lime are mixed according to the following weight percentage:
92 parts of iron ore powder and 8 parts of slaked lime.
(4) Preparing ingredients: and (3) mixing the wet-milled mixed mineral powder with bentonite to obtain a pelletizing raw material.
The mixed iron ore powder and the bentonite are mixed according to the following weight percentage:
98.5 parts of mixed iron ore powder and 1.5 parts of bentonite.
(5) Pelletizing: adding the raw materials into a disc pelletizer to obtain green pellets with the diameter of 8-16 mm.
(6) Preheating and roasting: the green pellets are distributed on a chain grate machine for preheating roasting, and the bursting proportion of the green pellets is less than 10.7 percent.
Example 6
In the embodiment, the proportion of the slaked lime is increased from 8 parts to 11 parts.
The specific steps are characterized as follows:
(1) preparing mineral powder: adding iron ore powder with high sulfur content into the rotary kiln. Wherein the iron ore powder is mountain west Dai county ore powder, and the chemical components are as follows: 65.2% of TFe, 0.47% of CaO, and SiO 2 =7.1%,MgO=0.42%,Al 2 O 3 0.63% and 0.64% and the proportion of the grain size composition smaller than 0.044mm is greater than 82.3%.
(2) Roasting mineral powder: adding iron ore powder into a rotary kiln, introducing high-temperature flue gas for roasting, wherein the temperature of the flue gas is 780 ℃, and the roasting time of the iron ore powder is 43 minutes.
(3) Mineral powder wet grinding pretreatment: and (3) uniformly mixing the roasted mineral powder and slaked lime, and adding the mixture into a moistening and grinding machine for moistening and grinding, wherein the water content of the mixture is 7.8%, and the moistening and grinding time is 18 minutes.
The iron ore powder and the slaked lime are mixed according to the following weight percentage:
89 parts of iron ore powder and 11 parts of slaked lime.
(4) Preparing ingredients: and (3) mixing the wet-milled mixed mineral powder with bentonite to obtain a pelletizing raw material.
The mixed iron ore powder and the bentonite are mixed according to the following weight percentage:
98.5 parts of mixed iron ore powder and 1.5 parts of bentonite.
(5) Pelletizing: adding the raw materials into a disc pelletizer to obtain green pellets with the diameter of 8-16 mm.
(6) Preheating and roasting: the green pellets are distributed on a chain grate machine for preheating roasting, and the bursting proportion of the green pellets is 9.8 percent.
Example 7
In this example, the proportion of slaked lime is further increased to 14 parts.
The specific steps are characterized as follows:
(1) Preparing mineral powder: adding iron ore powder with high sulfur content into the rotary kiln. Wherein the iron ore powder is the ore powder of Shanxi Dai county, and the chemical components are as follows: 65.2% of TFe, 0.47% of CaO, and SiO 2 =7.1%,MgO=0.42%,Al 2 O 3 0.63% and 0.64% and the proportion of the grain size composition smaller than 0.044mm is greater than 82.3%.
(2) Roasting mineral powder: adding iron ore powder into a rotary kiln, introducing high-temperature flue gas for roasting, wherein the temperature of the flue gas is 780 ℃, and the roasting time of the iron ore powder is 43 minutes.
(3) Mineral powder wet grinding pretreatment: and (3) uniformly mixing the roasted mineral powder and slaked lime, and adding the mixture into a moistening and grinding machine for moistening and grinding, wherein the water content of the mixture is 7.8%, and the moistening and grinding time is 18 minutes.
The iron ore powder and the slaked lime are mixed according to the following weight percentage:
86 parts of iron ore powder and 14 parts of slaked lime.
(4) Preparing ingredients: and (3) mixing the wet-milled mixed mineral powder with bentonite to obtain a pelletizing raw material.
The mixed iron ore powder and the bentonite are mixed according to the following weight percentage:
98.5 parts of mixed iron ore powder and 1.5 parts of bentonite.
(5) Pelletizing: adding the raw materials into a disc pelletizer to obtain green pellets with the diameter of 8-16 mm.
(6) Preheating and roasting: the green pellets are distributed on a chain grate machine for preheating roasting, and the bursting proportion of the green pellets is 9.5 percent.
Results and analysis
It can be seen that, for example 1, the iron ore powder is added into the rotary kiln, the high-temperature flue gas at 680 ℃ is introduced for roasting for 28 minutes, then the roasted ore powder and the slaked lime are mixed uniformly, the mixture is added into a moistening and grinding machine for moistening and grinding, then the mixture is prepared for pelletizing, and the green pellets are preheated and roasted on a chain grate machine, so that the cracking proportion of the green pellets is reduced from 18.6% of the reference example to 14.1%, and is reduced by 4.5%.
In example 2, the temperature of the high-temperature flue gas is raised from 680 ℃ to 700 ℃, the roasting time is prolonged from 28 minutes to 32 minutes, then the roasted mineral powder and slaked lime are mixed uniformly, the mixture is added into a moistening and grinding machine for moistening and grinding, then the mixture is proportioned for pelletizing, and the green pellets are preheated and roasted on a chain grate machine, the burst ratio of the green pellets is reduced from 18.6% of the reference example to 13.1%, and is reduced by 5.5%, and compared with example 1, the burst ratio is reduced by 0.9%.
In example 3, the temperature of the high-temperature flue gas is increased from 700 ℃ to 720 ℃, the roasting time is prolonged from 32 minutes to 35 minutes, then the roasted mineral powder and the slaked lime are mixed uniformly, the mixture is added into a moistening and grinding machine for moistening and grinding, then the mixture is prepared for pelletizing, and the green pellets are preheated and roasted on a chain grate machine, the green pellet explosion ratio is reduced from 18.6% of the reference example to 12.3%, and is reduced by 6.3%, and compared with example 2, the green pellet explosion ratio is reduced by 0.9%.
In example 4, the temperature of the high-temperature flue gas is increased from 720 ℃ to 750 ℃, the roasting time is prolonged from 35 minutes to 38 minutes, then the roasted mineral powder and the slaked lime are mixed uniformly, the mixture is added into a moistening and grinding machine for moistening and grinding, then the mixture is prepared for pelletizing, and the green pellets are preheated and roasted on a chain grate machine, the green pellet explosion ratio is reduced from 18.6% of the reference example to 11.0%, and is reduced by 7.6%, and compared with example 3, the green pellet explosion ratio is reduced by 0.7%.
In example 5, the temperature of the high-temperature flue gas is increased from 750 ℃ to 780 ℃, the roasting time is prolonged from 38 minutes to 43 minutes, then the roasted mineral powder and the slaked lime are mixed uniformly, the mixture is added into a moistening and grinding machine for moistening and grinding, then the mixture is prepared for pelletizing, and the green pellets are preheated and roasted on a chain grate machine, the green pellet explosion ratio is reduced from 18.6% of the reference example to 10.7%, and is reduced by 7.9%, and compared with example 4, the green pellet explosion ratio is reduced by 0.3%.
In example 6, when the temperature of the high-temperature flue gas is 780 ℃ and the roasting time is 43 minutes, the adding amount of slaked lime is increased from 8 parts to 11 parts during the wet grinding, then the mixture is proportioned and pelletized, and the green pellets are preheated and roasted on a chain grate machine, so that the bursting rate of the green pellets is reduced from 18.6 percent of the reference example to 9.8 percent and is reduced by 8.8 percent, and compared with example 5, the bursting rate of the green pellets is reduced by 0.9 percent.
In example 7, when the temperature of the high-temperature flue gas is 780 ℃ and the roasting time is 43 minutes, the adding amount of slaked lime is increased from 11 parts to 14 parts during the wet grinding, then the mixture is proportioned and pelletized, and the green pellets are preheated and roasted on a chain grate machine, so that the bursting rate of the green pellets is reduced to 9.5 percent from 18.6 percent of the reference example, and is reduced by 9.1 percent, and compared with example 5, the bursting rate of the green pellets is reduced by 0.3 percent.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.

Claims (10)

1. A preparation method of iron ore powder pellets is characterized by comprising the following steps:
(1) feeding iron ore powder into a rotary kiln for roasting;
(2) carrying out wet grinding on the roasted iron ore powder and the slaked lime by using a wet grinding machine to obtain a mixture;
(3) adding a binder into the mixture, and pelletizing to obtain green pellets;
(4) and preheating and roasting the green pellets to obtain iron ore powder pellets.
2. The method of producing pellets of iron ore fines as claimed in claim 1, wherein the iron ore fines fraction pack is comprised of iron ore fines in weight percentComprises the following steps: 62 to 66 percent of TFe, 0.3 to 0.8 percent of CaO, and SiO 2 5.8%-8.3%,MgO 0.3%-0.8%,Al 2 O 3 0.5%-0.7%,S 0.3%-0.7%。
3. The method for preparing the iron ore powder pellets according to claim 1, wherein the iron ore powder is mountain Xidai county ore powder, and the proportion of the iron ore powder with the particle size of less than 0.044mm is more than 75%.
4. The method for preparing iron ore powder pellets according to claim 1, wherein in the step (1), the roasting temperature is 650-800 ℃, and the roasting time is more than 25 minutes.
5. The method for preparing the iron ore powder pellets according to claim 1, wherein the weight ratio of the iron ore powder to the stone ash is 85-93: 7-15.
6. The method for preparing iron ore powder pellets according to claim 1, wherein the moisture content in the mixture is 7-8.5 wt%.
7. The method for preparing iron ore powder pellets according to claim 1, wherein the duration of the wet grinding is greater than 15 minutes.
8. The method for preparing iron ore powder pellets according to claim 1, wherein the green pellets have a particle size of 8-16 mm.
9. The method for preparing iron ore powder pellets according to claim 1, wherein the green pellets have a decrepitation ratio of less than 15%.
10. An iron ore powder pellet characterized by being prepared by the method for preparing iron ore powder pellets according to any one of claims 1 to 9.
CN202210339740.2A 2022-04-01 2022-04-01 Iron ore powder pellet and preparation method thereof Active CN114836616B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210339740.2A CN114836616B (en) 2022-04-01 2022-04-01 Iron ore powder pellet and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210339740.2A CN114836616B (en) 2022-04-01 2022-04-01 Iron ore powder pellet and preparation method thereof

Publications (2)

Publication Number Publication Date
CN114836616A true CN114836616A (en) 2022-08-02
CN114836616B CN114836616B (en) 2023-12-29

Family

ID=82564376

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210339740.2A Active CN114836616B (en) 2022-04-01 2022-04-01 Iron ore powder pellet and preparation method thereof

Country Status (1)

Country Link
CN (1) CN114836616B (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102242254A (en) * 2011-06-29 2011-11-16 中南大学 High sulfide pyrite pellet reinforced roasting consolidation technology
CN102399978A (en) * 2011-11-09 2012-04-04 山西太钢不锈钢股份有限公司 Manufacture method of iron ore MgO pellet ore
CN102897812A (en) * 2012-10-19 2013-01-30 北京化工大学 Method for activating high-sulfur bauxite by means of low-temperature roasting desulfurization method
CN106011460A (en) * 2016-07-15 2016-10-12 攀钢集团攀枝花钢铁研究院有限公司 Method for preparing sinter through high-sulfur iron ore concentrate
CN108893600A (en) * 2018-07-09 2018-11-27 刘慧南 A kind of method of troilite production iron acid pellet
CN112322891A (en) * 2020-10-13 2021-02-05 首钢京唐钢铁联合有限责任公司 Finished pellet and preparation method thereof
CN113355510A (en) * 2021-05-24 2021-09-07 北京科技大学 Pellet based on secondary resources such as scrap iron and preparation method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102242254A (en) * 2011-06-29 2011-11-16 中南大学 High sulfide pyrite pellet reinforced roasting consolidation technology
CN102399978A (en) * 2011-11-09 2012-04-04 山西太钢不锈钢股份有限公司 Manufacture method of iron ore MgO pellet ore
CN102897812A (en) * 2012-10-19 2013-01-30 北京化工大学 Method for activating high-sulfur bauxite by means of low-temperature roasting desulfurization method
CN106011460A (en) * 2016-07-15 2016-10-12 攀钢集团攀枝花钢铁研究院有限公司 Method for preparing sinter through high-sulfur iron ore concentrate
CN108893600A (en) * 2018-07-09 2018-11-27 刘慧南 A kind of method of troilite production iron acid pellet
CN112322891A (en) * 2020-10-13 2021-02-05 首钢京唐钢铁联合有限责任公司 Finished pellet and preparation method thereof
CN113355510A (en) * 2021-05-24 2021-09-07 北京科技大学 Pellet based on secondary resources such as scrap iron and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
席玉明: "润磨预处理改善赤铁矿粉球团矿性能的研究", 《矿冶工程》, vol. 32, no. 4, pages 73 - 76 *

Also Published As

Publication number Publication date
CN114836616B (en) 2023-12-29

Similar Documents

Publication Publication Date Title
KR101798162B1 (en) Method for producing an agglomerate made of fine material containing metal oxide for use as a blast furnace feed material
AU2015297792B2 (en) Method for smelting nickel oxide ore
JP5375742B2 (en) Granulation method of sintering raw material
CN109182738B (en) Method for producing MgO pellets
CN110438335B (en) Composite iron ore pellet containing biological carbon for microwave reduction and preparation and application thereof
RU2676378C1 (en) Method of obtaining reduced iron
CN106186737A (en) A kind of method of the eco-friendly light-burned good quality magnesium oxide of magnesite concentrate
JP5098248B2 (en) Granulation method of iron-containing dust collection dusts for iron making
CN113333770B (en) Preparation method of powder metallurgy iron powder
JP4935133B2 (en) Ferro-coke and method for producing sintered ore
CA1149617A (en) Porous iron ore pellets and process for manufacturing same
JP5817629B2 (en) Method for producing sintered ore using finely granulated carbon
CN110205487B (en) Production method of fluorine-containing vanadium-titanium pellet ore
CN110527826B (en) Sintering method for inhibiting perovskite generation in sintering process
JP3820132B2 (en) Pretreatment method of sintering raw material
CN110054225B (en) Preparation method of oxygen carrier
CN105063346B (en) A kind of method of reduction MgO pellet-roasting temperature
CN114836616B (en) Iron ore powder pellet and preparation method thereof
US10323297B2 (en) Method for producing pellet and method for smelting nickel oxide ore
CN110343796B (en) Method for reducing iron loss in blast furnace smelting of vanadium titano-magnetite
RU2464329C2 (en) Pellet manufacturing charge
WO2016039247A1 (en) Method for producing granular metallic iron
CN110592372A (en) Method for preparing sintering fuel by using coking environment dedusting ash and using method
CN110846497B (en) Binder for magnesium-containing fluxed pellets and preparation method thereof
RU2717758C1 (en) Method of producing granular metallic iron

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant