CN114836616A - Iron ore powder pellet and preparation method thereof - Google Patents
Iron ore powder pellet and preparation method thereof Download PDFInfo
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- 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
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 276
- 239000000843 powder Substances 0.000 title claims abstract description 187
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 138
- 239000008188 pellet Substances 0.000 title claims abstract description 119
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 47
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 37
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 37
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 37
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 37
- 238000005453 pelletization Methods 0.000 claims abstract description 28
- 238000001238 wet grinding Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 20
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 20
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 11
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 239000004575 stone Substances 0.000 claims 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 20
- 239000011593 sulfur Substances 0.000 abstract description 17
- 230000009172 bursting Effects 0.000 abstract description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 description 41
- 235000010755 mineral Nutrition 0.000 description 41
- 239000011707 mineral Substances 0.000 description 41
- 238000000227 grinding Methods 0.000 description 34
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 31
- 239000003546 flue gas Substances 0.000 description 31
- 239000000440 bentonite Substances 0.000 description 25
- 229910000278 bentonite Inorganic materials 0.000 description 25
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical group O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 25
- 239000002994 raw material Substances 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000004615 ingredient Substances 0.000 description 9
- 230000002035 prolonged effect Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 238000004880 explosion Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
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
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.
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