CN111118284A - F-containing sinter and production method thereof - Google Patents
F-containing sinter and production method thereof Download PDFInfo
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- CN111118284A CN111118284A CN202010040612.9A CN202010040612A CN111118284A CN 111118284 A CN111118284 A CN 111118284A CN 202010040612 A CN202010040612 A CN 202010040612A CN 111118284 A CN111118284 A CN 111118284A
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- Prior art keywords
- sintered ore
- containing sintered
- producing
- ore
- powder
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
-
- 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
Abstract
The invention discloses an F-containing sintered ore and a production method thereof, wherein the production method comprises the following steps: 1) the materials are prepared according to the following mass percentage: iron ore concentrate A5-15%, iron ore powder B65-75%, limestone 3.5-8.5%, light-burned dolomite 0-4%, serpentine 1.5-2.5%, quicklime 3.0-4.5%, and coke powder 4.5-6.0%, to obtain a raw material; 2) adding water into the raw materials, mixing to obtain a mixture, and granulating to obtain granules; 3) and distributing, igniting and sintering the granules to obtain the F-containing sinter. The drum strength of the prepared F-containing sinter is more than or equal to 65.5 percent, and the method can be effectively used for blast furnace production and ensures long-term smooth blast furnace production.
Description
Technical Field
The invention belongs to the technical field of metallurgical sintered ore production, particularly relates to an F-containing sintered ore and a production method thereof, and particularly relates to an F-containing sintered ore with higher drum strength and a production method thereof.
Background
The sintered ore is the most important iron-containing furnace charge of the blast furnace, currently, the furnace charge structure commonly used in domestic blast furnaces is high-alkalinity sintered ore matched with pellet ore, the percentage of the sintered ore is about 75%, the drum strength is an index for measuring the impact resistance and the wear resistance of the sintered ore, the smelting level of the blast furnace is directly influenced by the height of the sintered ore, the drum index of the sintered ore is low, the sintered ore is easy to break in the processes of transportation, distribution and blast furnace smelting, powder is generated, the air permeability of the blast furnace is deteriorated, and the smooth operation of the blast furnace is finally influenced. Therefore, the drum strength of the sintered ore has important significance for blast furnace smelting and stable and smooth running. However, the drum strength of the F-containing sintered ore of the blast furnace used at present is generally not high, and the smooth operation of the blast furnace is seriously influenced.
Disclosure of Invention
In view of one or more of the problems of the prior art, an aspect of the present invention provides a method for producing F-containing sintered ore, comprising the steps of:
1) the materials are prepared according to the following mass percentage: iron ore concentrate A5-15%, iron ore powder B65-75%, limestone 3.5-8.5%, light-burned dolomite 0-4%, serpentine 1.5-2.5%, quicklime 3.0-4.5%, and coke powder 4.5-6.0%, to obtain a raw material;
2) adding water into the raw materials, mixing to obtain a mixture, and granulating to obtain granules;
3) and distributing, igniting and sintering the granules to obtain the F-containing sinter.
The grade of the iron ore concentrate A in the step 1) is as follows: TFe: 60.0-65.0%, and the chemical components by mass percent are as follows: FeO: 0.1-0.5%, CaO: 0.3% -0.6% of SiO2：25.0％～30.0％、MgO：0.65％～1.05％、RE：0.001％～0.030％、Ig：6.5％～8.5％；
The grade of the iron ore powder B is as follows: TFe: 64.5 to 66.5 percent, and the main chemical components are as follows: FeO: 27.5% -31.0%, CaO: 0.75% -2.35% of SiO2：1.05％～3.5％、MgO：0.65％～1.05％、Na2O：0.05％～0.15％、F：0.08％～0.3％、S：0.65％～0.95％、P：0.045％～0.083％、Al2O3：0.102％～0.175％、K2O: 0.05% -0.15%, Ig: 1.0% -2.0%; the granularity of the iron ore powder B is 90-95% of the passing rate of a 200-mesh screen.
The Ig referred to above is burn-down, also known as burn-out.
The mass percentage of the water in the mixture in the step 2) is 7.0-9.0%.
The time of the granulating process in the step 2) is 4-6 min, and the average particle size of granules is 7-15 mm.
Controlling the ignition time in the step 3) to be 1-3 min, and controlling the ignition negative pressure to be 4000-6000 Pa; the sintering process is accompanied with air draft treatment, and the negative pressure of the air draft is 9000-12000 Pa.
In another aspect, the present invention provides an F-containing sintered ore obtained by the above production method.
The alkalinity of the F-containing sintered ore is 1.95-2.05.
The mass percentage of MgO in the F-containing sintered ore is 1.90-2.05%.
The drum strength of the F-containing sintered ore is more than or equal to 68.8 percent.
According to the production method of the F-containing sintered ore provided by the technical scheme, the rare earth-containing iron ore concentrate and other iron materials are mixed according to a certain proportion, and under the condition that the sintered ore quality index is ensured to be in a control range, the microstructure of the F-containing sintered ore can be effectively improved, so that the drum strength of the F-containing sintered ore is improved, and the consumption of sintered solid fuel is reduced. The basicity of the obtained F-containing sintered ore is 1.95-2.05, the mass percentage of MgO is 1.90% -2.05%, and the drum strength is not less than 65.5%, so that the method can be effectively used for blast furnace production, and ensures long-term smooth blast furnace production.
Detailed Description
Aiming at the defects of F-containing sintered ores in the prior art, the invention uses the rare-earth-containing iron concentrate to be mixed with other iron materials according to a certain proportion, and effectively improves the microstructure of the F-containing sintered ores under the condition of ensuring the quality index of the sintered ores in a control range, thereby improving the drum strength of the F-containing sintered ores and reducing the consumption of sintered solid fuels.
The present invention will be described in detail with reference to specific examples.
The following disclosure provides many different embodiments, or examples, for implementing different aspects of the invention. The present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
The present invention is described in detail below with reference to specific examples. The embodiments are implemented on the premise of the technical scheme of the invention, and detailed implementation modes and specific operation processes are given, but the disclosure of the invention is not limited to the following embodiments.
The methods used in the following examples are conventional methods unless otherwise specified.
Examples
1) Blending raw materials according to the raw fuel shown in the following table 1 and the mixture ratio shown in the following table 2, wherein the particle size of the iron ore powder B is 95% of the passing rate of a 200-mesh screen, so as to obtain a raw material;
2) adding water into the raw materials in a primary mixer, and uniformly mixing, wherein the water content is controlled to be 7.0%; then granulating in a secondary mixer for 5min to obtain granules with the average particle size of 10 mm;
3) the granulated granules are uniformly distributed to a sintering device through a distributing device, the thickness of a material layer is 700mm, ignition is carried out through a sintering igniter, ignition fuel is natural gas, the ignition time is 2.0min, meanwhile, air draft is started at the bottom of the sintering device, certain negative pressure is formed under a grate, the ignition negative pressure is 6000Pa, air after ignition is pumped away from the sintering material layer from top to bottom, the sintering process is accompanied with air draft treatment, the sintering air draft negative pressure is 10000Pa, and a combustion zone on the surface of the material layer after ignition gradually moves towards the lower material layer along with the completion of combustion of fuel on the upper part. And when the combustion zone reaches the grate, the sintering process is ended to obtain the sinter.
4) The obtained chemical components of the sinter and the process indexes of the sinter are detected, and the results are shown in table 3.
Table 1: chemical composition of raw fuel for sintering (wt%)
Table 2: raw material ratios (wt%) of examples
Table 3: chemical composition and Process index of sintered Ore of example
From the data in tables 2 and 3 above, it can be seen that, in terms of solid burnup: compared with the basic example, the solid fuel consumption is in a decreasing trend along with the increase of the proportioning of the rare earth-containing iron concentrate, and particularly, the solid fuel consumption is remarkably reduced when the proportioning of the rare earth-containing iron concentrate is increased to more than 10 wt%. In terms of drum strength of sintered ore: compared with the basic example, the obtained F-containing sintered ore tends to increase in drum strength with the increase of the proportion of the rare earth-containing iron concentrate, and particularly, the drum strength of the obtained F-containing sintered ore is remarkably improved when the proportion of the rare earth-containing iron concentrate is increased to more than 10 wt%.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for producing F-containing sintered ore, comprising the steps of:
1) the materials are prepared according to the following mass percentage: iron ore concentrate A5-15%, iron ore powder B65-75%, limestone 3.5-8.5%, light-burned dolomite 0-4%, serpentine 1.5-2.5%, quicklime 3.0-4.5%, and coke powder 4.5-6.0%, to obtain a raw material;
2) adding water into the raw materials, mixing to obtain a mixture, and granulating to obtain granules;
3) and distributing, igniting and sintering the granules to obtain the F-containing sinter.
2. The method for producing F-containing sintered ore according to claim 1, wherein the grade of the iron ore concentrate a in step 1): TFe: 60.0-65.0%, and the chemical components by mass percent are as follows: FeO: 0.1-0.5%, CaO: 0.3% -0.6% of SiO2：25.0％～30.0％、MgO：0.65％～1.05％、RE：0.001％～0.030％、Ig：6.5％～8.5％；
The grade of the iron ore powder B is as follows: TFe: 64.5 to 66.5 percent, and the main chemical components are as follows: FeO: 27.5% -31.0%, CaO: 0.75% -2.35% of SiO2：1.05％～3.5％、MgO：0.65％～1.05％、Na2O：0.05％～0.15％、F：0.08％～0.3％、S：0.65％～0.95％、P：0.045％～0.083％、Al2O3：0.102％～0.175％、K2O: 0.05% -0.15%, Ig: 1.0% -2.0%; the granularity of the iron ore powder B is 90-95% of the passing rate of a 200-mesh screen.
3. The method for producing F-containing sintered ore according to claim 1 or 2, wherein the moisture content in the mixture in step 2) is 7.0% to 9.0% by mass.
4. The method for producing F-containing sintered ore according to any one of claims 1 to 3, wherein the time for the granulation process in step 2) is 4 to 6min, and the average particle diameter of the pellets is 7mm to 15 mm.
5. The method for producing F-containing sintered ore according to any one of claims 1 to 4, wherein the ignition time in the step 3) is controlled to be 1 to 3min, and the ignition negative pressure is 4000 to 6000 Pa; the sintering process is accompanied with air draft treatment, and the negative pressure of the air draft is 9000-12000 Pa.
6. An F-containing sintered ore obtained by the production method according to any one of claims 1 to 5.
7. The F-containing sintered ore according to claim 6, wherein the basicity of the F-containing sintered ore is 1.95 to 2.05.
8. The F-containing sintered ore according to claim 6 or 7, wherein the mass percentage of MgO in the F-containing sintered ore is 1.90-2.05%.
9. The F-containing sintered ore according to any one of claims 6 to 8, wherein the drum strength of the F-containing sintered ore is 65.5% or more.
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| CN202010040612.9A CN111118284A (en) | 2020-01-15 | 2020-01-15 | F-containing sinter and production method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342372A (en) * | 2020-08-31 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | Method for improving microstructure of sinter |
| CN114058840A (en) * | 2021-10-20 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for improving quality of sinter by using combustible gas |
| CN114350937A (en) * | 2021-12-28 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for optimizing quality of sinter |
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| CN104651602A (en) * | 2015-01-12 | 2015-05-27 | 内蒙古包钢钢联股份有限公司 | Method for preparing sinter ore by using high-silicon fine ore |
| CN107460310A (en) * | 2017-08-09 | 2017-12-12 | 包头钢铁（集团）有限责任公司 | A kind of method for preparing sintering deposit |
| CN109517977A (en) * | 2018-11-26 | 2019-03-26 | 东北大学 | A kind of sintering method of high-chromic vanadium-titanium ferroferrite fine powder with addition of common fine powder of magnetite |
| CN109576488A (en) * | 2018-11-07 | 2019-04-05 | 包头钢铁（集团）有限责任公司 | A method of sinter is produced using high proportion Bayan Obo iron ore concentrate |
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2020
- 2020-01-15 CN CN202010040612.9A patent/CN111118284A/en active Pending
Patent Citations (5)
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| CN104531981A (en) * | 2014-11-21 | 2015-04-22 | 内蒙古包钢钢联股份有限公司 | Method used for preparing sintered ore from high sulfur iron concentrate |
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| CN109517977A (en) * | 2018-11-26 | 2019-03-26 | 东北大学 | A kind of sintering method of high-chromic vanadium-titanium ferroferrite fine powder with addition of common fine powder of magnetite |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112342372A (en) * | 2020-08-31 | 2021-02-09 | 包头钢铁（集团）有限责任公司 | Method for improving microstructure of sinter |
| CN114058840A (en) * | 2021-10-20 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for improving quality of sinter by using combustible gas |
| CN114350937A (en) * | 2021-12-28 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for optimizing quality of sinter |
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