CN116904741A - Method for reducing the expansion rate of pellets - Google Patents
Method for reducing the expansion rate of pellets Download PDFInfo
- Publication number
- CN116904741A CN116904741A CN202310690392.8A CN202310690392A CN116904741A CN 116904741 A CN116904741 A CN 116904741A CN 202310690392 A CN202310690392 A CN 202310690392A CN 116904741 A CN116904741 A CN 116904741A
- Authority
- CN
- China
- Prior art keywords
- magnetite
- iron ore
- pellets
- expansion rate
- fine iron
- 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.)
- Pending
Links
- 239000008188 pellet Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229910052742 iron Inorganic materials 0.000 claims abstract description 45
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 41
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003112 inhibitor Substances 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000010304 firing Methods 0.000 claims abstract description 25
- 239000004615 ingredient Substances 0.000 claims abstract description 18
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 16
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000005453 pelletization Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 7
- HBXWYZMULLEJSG-UHFFFAOYSA-N chromium vanadium Chemical compound [V][Cr][V][Cr] HBXWYZMULLEJSG-UHFFFAOYSA-N 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005096 rolling process 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/02—General features in the manufacture of pig-iron by applying additives, e.g. fluxing agents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/216—Sintering; Agglomerating in rotary furnaces
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of pellet ore preparation, in particular to a method for reducing the expansion rate of pellets, which comprises the following specific production steps: selecting ingredients, wherein the ingredients comprise high-chromium vanadium titano-magnetite, fine iron ore and inhibitors, and the ingredients comprise the following components in parts by mass: the high-chromium vanadium titano-magnetite, the fine iron ore and the inhibitor are respectively 10-20 parts, 100 parts and 3-7 parts; material treatment, namely treating high-chromium vanadium titano-magnetite and fine iron ore, crushing the high-chromium vanadium titano-magnetite and the fine iron ore, and uniformly mixing the crushed high-chromium vanadium titano-magnetite, the crushed fine iron ore and the prepared inhibitor through a stirring mechanism; pelletizing and drying, namely preparing the uniformly mixed materials into pellets by a pelletizer and drying; firing and measuring the expansion rate. According to the invention, a certain proportion of high-chromium vanadium titano-magnetite and inhibitor are added into the fine iron ore for preparing pellets, wherein the inhibitor adopts magnesium oxide or silicon dioxide, so that the expansion rate of the produced pellets is obviously reduced, and the use requirement of a blast furnace can be met.
Description
Technical Field
The invention relates to the technical field of pellet ore preparation, in particular to a method for reducing the expansion rate of pellets.
Background
The pellet is one method of producing artificial block material and is one process of changing powder material into physical and chemical composition to meet the requirement of the next step. In the process of pelletizing, the materials not only have physical properties such as density, porosity, shape, mechanical strength of the camera and the like, but also have chemical and physical chemical properties such as chemical composition, reducibility, expansibility, high-temperature reduction softening property, low-temperature reduction softening property, melting property and the like due to rolling into pellets and dense particles, so that the metallurgical performance of the materials is improved. The pellet method is a novel agglomeration method and is rapidly developed after self-feeding. The product is not only used for blast furnaces, but also used for converters, open-hearth furnaces or electric furnaces.
When the pellets are put into a blast furnace, the expansion rate of the pellets is required to be less than 20%, and the operation and the work of the blast furnace are affected, so the invention provides a method for reducing the expansion rate of the pellets, and the prepared pellets can meet the use requirement of the blast furnace.
Disclosure of Invention
The present invention is directed to a method for reducing the expansion rate of pellets to solve the problems set forth in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the method for reducing the expansion rate of the pellets comprises the following specific production steps:
(1) Selecting ingredients
The ingredients comprise high-chromium vanadium titano-magnetite, fine iron ore and inhibitor, and the ingredients are as follows in parts by mass: the high-chromium vanadium titano-magnetite, the fine iron ore and the inhibitor are respectively 10-20 parts, 100 parts and 3-7 parts;
(2) Material handling
Treating the high-chromium vanadium titano-magnetite and the fine iron ore in the step (1), crushing the high-chromium vanadium titano-magnetite and the fine iron ore, and uniformly mixing the crushed high-chromium vanadium titano-magnetite, the fine iron ore and the prepared inhibitor through a stirring mechanism for standby;
(3) Pelletizing and drying
Preparing the uniformly mixed materials in the step (2) into spheres by a granulator, and drying the prepared spheres;
(4) Firing and measuring expansion ratio
And firing the dried pellets by rotary kiln equipment, and measuring the expansion rate of the fired pellets.
Preferably: the high-chromium vanadium titano-magnetite is an ore material with the content of 1-1.5 ℃.
Preferably: the fine iron ore adopts common iron ore for manufacturing pellets.
Preferably: the inhibitor is divided into magnesium oxide or silicon dioxide or a mixture of magnesium oxide and silicon dioxide, and the magnesium oxide and the silicon dioxide are all in powder structures.
Preferably: when the inhibitor adopts a mixture of magnesium oxide and silicon dioxide, the proportion of the magnesium oxide to the silicon dioxide is as follows: 2:1.
preferably: filtering the high-chromium vanadium titano-magnetite by a 300-400 mesh screen; the proportion of the materials passing through a 600-700 mesh screen in the fine iron ore reaches 75-80 percent.
Preferably: the direct control of pelletizing in step (3) is 9-11mm.
Preferably: the preheating temperature of the rotary kiln is 780-850 ℃ and the preheating time is 6-10min.
Preferably: the firing temperature of the rotary kiln is controlled to be 1100-1180 ℃ and the firing time is 7-10min.
Preferably: the preheating temperature of the rotary kiln is 810 ℃, and the preheating time is 8min; the firing temperature of the rotary kiln is controlled at 1140 ℃ and the firing time is 9min.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, a certain proportion of high-chromium vanadium titano-magnetite and inhibitor are added into the fine iron ore for preparing pellets, wherein the inhibitor adopts magnesium oxide or silicon dioxide, so that the expansion rate of the produced pellets is obviously reduced, and the use requirement of a blast furnace can be met.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the specific embodiments.
Example 1
The method for reducing the expansion rate of the pellets comprises the following specific production steps:
(1) Selecting ingredients, wherein the ingredients comprise high-chromium vanadium titano-magnetite, fine iron ore and inhibitor, and the ingredients comprise the following components in parts by mass: the high-chromium vanadium titano-magnetite, the fine iron ore and the inhibitor are respectively 10 parts, 100 parts and 3 parts;
wherein, the high-chromium vanadium titano-magnetite is selected from ore materials with the content of 1 ℃; the fine iron ore adopts common iron ore for manufacturing pellets; the inhibitor is powdered magnesium oxide;
(2) Material treatment, namely, treating the high-chromium vanadium titano-magnetite and the fine iron ore in the step (1), crushing the high-chromium vanadium titano-magnetite, filtering the high-chromium vanadium titano-magnetite by a 300-mesh screen, enabling the material proportion of the fine iron ore passing through the 600-mesh screen to reach 75%, and uniformly mixing the crushed high-chromium vanadium titano-magnetite, the fine iron ore and the prepared inhibitor by a stirring mechanism for later use;
(3) Pelletizing and drying, namely preparing the uniformly mixed materials in the step (2) into pellets by a pelletizer, directly controlling the pelletizing to be 9mm, and drying the prepared pellets;
(4) Firing and measuring the expansion rate, firing the dried pellets by rotary kiln equipment, and measuring the expansion rate of the fired pellets; the preheating temperature of the rotary kiln is 780 ℃ and the preheating time is 6min; the firing temperature is controlled at 1100 ℃ and the firing time is 7min.
Example 2
The method for reducing the expansion rate of the pellets comprises the following specific production steps:
(1) Selecting ingredients, wherein the ingredients comprise high-chromium vanadium titano-magnetite, fine iron ore and inhibitor, and the ingredients comprise the following components in parts by mass: 20 parts of high-chromium vanadium titano-magnetite, 100 parts of fine iron ore and 7 parts of inhibitor;
wherein, the high-chromium vanadium titano-magnetite is selected from ore materials with the content of 1.5 ℃; the fine iron ore adopts common iron ore for manufacturing pellets; the inhibitor adopts a mixture of magnesium oxide and silicon dioxide, and the magnesium oxide and the silicon dioxide are all in a powdery structure;
furthermore, the mixing ratio of magnesium oxide and silicon dioxide in the inhibitor is 2:1, a step of;
(2) Material handling
The high-chromium vanadium titano-magnetite and the fine iron ore in the step (1) are treated, crushed, the high-chromium vanadium titano-magnetite is filtered by a 400-mesh screen, the proportion of materials passing through the 700-mesh screen in the fine iron ore reaches 80%, and then the crushed high-chromium vanadium titano-magnetite, the fine iron ore and the prepared inhibitor are uniformly mixed by a stirring mechanism for standby;
(3) Pelletizing and drying
Preparing the uniformly mixed materials in the step (2) into spheres by a granulator, directly controlling the pelleting diameter to be 10mm, and drying the prepared spheres;
(4) Firing and measuring expansion ratio
Firing the dried pellets by rotary kiln equipment, and then measuring the expansion rate of the fired pellets; the preheating temperature of the rotary kiln is between 810 ℃ and the preheating time is 8min; the firing temperature is controlled at 1140 ℃ and the firing time is 9min.
Example 3
The method for reducing the expansion rate of the pellets comprises the following specific production steps:
(1) Selecting ingredients, wherein the ingredients comprise high-chromium vanadium titano-magnetite, fine iron ore and inhibitor, and the ingredients comprise the following components in parts by mass: 16 parts of high-chromium vanadium titano-magnetite, 100 parts of fine iron ore and 5 parts of inhibitor respectively;
wherein, the high-chromium vanadium titano-magnetite is selected from ore materials with the content of 1.5 ℃; the fine iron ore adopts common iron ore for manufacturing pellets; the inhibitor adopts powdered silicon dioxide;
(2) Material handling
Treating the high-chromium vanadium titano-magnetite and the fine iron ore in the step (1), crushing the high-chromium vanadium titano-magnetite, filtering the high-chromium vanadium titano-magnetite by a 300-mesh screen, enabling the material proportion of the fine iron ore passing through the 700-mesh screen to reach 75%, and uniformly mixing the crushed high-chromium vanadium titano-magnetite, the fine iron ore and the prepared inhibitor by a stirring mechanism for standby;
(3) Pelletizing and drying
Preparing the uniformly mixed materials in the step (2) into spheres by a granulator, directly controlling the pelleting diameter to be 11mm, and drying the prepared spheres;
(4) Firing and measuring expansion ratio
Firing the dried pellets by rotary kiln equipment, and then measuring the expansion rate of the fired pellets; the preheating temperature of the rotary kiln is between 850 ℃ and the preheating time is 10min; the firing temperature is controlled at 1180 ℃ and the firing time is 10min.
Pellets produced according to the above examples 1/2/3 have expansion ratios of 15.3%, 14.2% and 16.1%, respectively, which are significantly smaller than those of the conventional pellets of 20 to 30% in the prior art, thus demonstrating that the invention can reduce the expansion ratio of pellets by adding high-chromium vanadium titanomagnetite and inhibitors to fine iron ores in a certain ratio.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. The method for reducing the expansion rate of the pellets is characterized by comprising the following specific production steps:
(1) Selecting ingredients
The ingredients comprise high-chromium vanadium titano-magnetite, fine iron ore and inhibitor, and the ingredients are as follows in parts by mass: the high-chromium vanadium titano-magnetite, the fine iron ore and the inhibitor are respectively 10-20 parts, 100 parts and 3-7 parts;
(2) Material handling
Treating the high-chromium vanadium titano-magnetite and the fine iron ore in the step (1), crushing the high-chromium vanadium titano-magnetite and the fine iron ore, and uniformly mixing the crushed high-chromium vanadium titano-magnetite, the fine iron ore and the prepared inhibitor through a stirring mechanism for standby;
(3) Pelletizing and drying
Preparing the uniformly mixed materials in the step (2) into spheres by a granulator, and drying the prepared spheres;
(4) Firing and measuring expansion ratio
And firing the dried pellets by rotary kiln equipment, and measuring the expansion rate of the fired pellets.
2. The method for reducing the expansion rate of pellets according to claim 1, wherein the high-chromium vanadium titano-magnetite is selected from ore materials with a content of 1-1.5 degrees.
3. The method for reducing the expansion rate of pellets according to claim 1, wherein the fine iron ore is common iron ore used for manufacturing pellets.
4. The method for reducing the expansion rate of pellets according to claim 1, wherein the inhibitor is classified as magnesium oxide or silica or a mixture of magnesium oxide and silica, and the magnesium oxide and the silica are each in a powdery structure.
5. The method for reducing the expansion rate of pellets according to claim 4, wherein when the inhibitor is a mixture of magnesium oxide and silicon dioxide, the ratio of magnesium oxide to silicon dioxide is: 2:1.
6. the method for reducing the expansion rate of pellets according to claim 1, wherein the high chromium vanadium titano-magnetite is filtered through a 300-400 mesh screen; the proportion of the materials passing through a 600-700 mesh screen in the fine iron ore reaches 75-80 percent.
7. The method for reducing the expansion rate of pellets according to claim 1, wherein the direct control of pelletizing in the step (3) is 9-11mm.
8. The method for reducing the expansion rate of pellets according to claim 1, wherein the preheating temperature of the rotary kiln is between 780 ℃ and 850 ℃ and the preheating time is between 6 and 10 minutes.
9. The method for reducing the expansion rate of pellets according to claim 1, wherein the firing temperature of the rotary kiln is controlled to 1100 ℃ to 1180 ℃ and the firing time is 7min to 10min.
10. The method for reducing the expansion rate of pellets according to claim 8 or 9, wherein the preheating temperature of the rotary kiln is 810 ℃ and the preheating time is 8min; the firing temperature of the rotary kiln is controlled at 1140 ℃ and the firing time is 9min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310690392.8A CN116904741A (en) | 2023-06-12 | 2023-06-12 | Method for reducing the expansion rate of pellets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310690392.8A CN116904741A (en) | 2023-06-12 | 2023-06-12 | Method for reducing the expansion rate of pellets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116904741A true CN116904741A (en) | 2023-10-20 |
Family
ID=88363738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310690392.8A Pending CN116904741A (en) | 2023-06-12 | 2023-06-12 | Method for reducing the expansion rate of pellets |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116904741A (en) |
-
2023
- 2023-06-12 CN CN202310690392.8A patent/CN116904741A/en active Pending
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