CN114622088A - Method for controlling particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron concentrate - Google Patents

Method for controlling particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron concentrate Download PDF

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CN114622088A
CN114622088A CN202210188320.9A CN202210188320A CN114622088A CN 114622088 A CN114622088 A CN 114622088A CN 202210188320 A CN202210188320 A CN 202210188320A CN 114622088 A CN114622088 A CN 114622088A
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limestone
powder
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sodium
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付国伟
白晓光
吕志义
张永
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Baotou Iron and Steel Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating

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Abstract

The invention discloses a method for controlling the granularity of limestone for producing a sinter by adding high-proportion potassium, sodium and fluorine iron concentrate, which comprises the following steps: containing K2O、Na2O, F Low SiO240-50% of iron ore concentrate, 30-45% of No. 1 Australian powder, 10-15% of No. 2 Australian powder and sintered ore SiO2The content is controlled to be 5.0% +/-0.1%, the content of CaO in the sinter is controlled to be 10.2% +/-0.1%, the content of MgO is controlled to be 2.0% +/-0.1%, the proportion of coke powder is 4.10-4.20%, the external calcium lime is 4.0-6.0%, and the external limestone is 5.5-7.5%; the percentage of the fine grinding powder with the granularity less than or equal to 3mm in the limestone accounts for more than or equal to 85 percent of the total weight of the limestone. The invention realizes the complete mineralization reaction of the limestone with the concentrate containing potassium, sodium and fluorine iron in the sintering process by optimizing the granularity of the limestone, and improves the quality index of the sintered mineral product of the concentrate containing potassium, sodium and fluorine iron with high proportion.

Description

Control method for producing limestone particle size for sinter by adding high-proportion potassium, sodium and fluorine iron concentrate
Technical Field
The invention relates to the technical field of iron-making raw material agglomeration, in particular to a method for controlling the granularity of limestone for producing a sinter by adding high-proportion potassium, sodium and fluorine iron concentrate.
Background
The iron-containing raw materials for producing the sinter by using the ladle steel mainly comprise: potassium, sodium, fluorine iron ore concentrate (-0.074mm size fraction is more than 90%), imported iron ore powder and a small amount of iron-containing solid waste raw material. The concentrate containing potassium, sodium and fluorine iron is magnetite, belongs to special ore, and contains harmful elements of potassium, sodium and fluorine as well as rare earth elements; the content of the silicon dioxide is lower and is between 1.0 percent and 1.5 percent, and the silicon dioxide exists in a complex silicate form containing potassium and sodium; the grinding granularity of the iron ore concentrate is extremely fine, the grain size of-0.074 mm reaches more than 90 percent, and the iron ore concentrate belongs to the ultra-fine iron ore concentrate. Therefore, the main source of the adhering powder in the steel-coated sintering process is potassium-containing, sodium-containing and fluorine-iron ore concentrate, which is the basis for generating the steel-coated sintering liquid phase, and how to match and select the granularity of the sintering flux limestone, so that the sintering flux limestone can be completely mineralized with the potassium-containing, sodium-containing and fluorine-iron ore concentrate in the sintering process, which is the key for improving the yield quality index of the steel-coated sintering ore.
Disclosure of Invention
The invention aims to provide a method for controlling the granularity of limestone for producing sinter by adding high-proportion potassium, sodium and fluorine iron ore concentrates, which mainly solves the problem of improving the quality index of the sintered ore of the potassium, sodium and fluorine iron ore concentrates by optimizing the granularity of the limestone to realize that the limestone completely undergoes mineralization reaction with the potassium, sodium and fluorine iron ore concentrates in the sintering process.
In order to solve the technical problem, the invention adopts the following technical scheme:
a proportioning method for improving the quality of high-proportion potassium, sodium and fluorine-iron ore concentrate sintered ore by optimizing limestone granularity comprises the following raw materials in percentage by weight: containing K2O、Na2O, F Low SiO240-50% of iron ore concentrate, 30-45% of No. 1 Australian powder, 10-15% of No. 2 Australian powder and sintered ore SiO2The content is controlled to be 5.0% +/-0.1%, the content of CaO in the sinter is controlled to be 10.2% +/-0.1%, the content of MgO in the sinter is controlled to be 2.0% +/-0.1%, the content of quicklime (externally added) is 4.0-6.0%, the content of limestone (externally added) is 5.5-7.5%, the proportion of coke powder is 4.10-4.20%, the proportion of serpentine is 0.9-1.5%, and the proportion of dolomite is 1.0-1.5%. In the comparative example, the percentage of the fine grinding powder with the granularity less than or equal to 3mm in the limestone mineral accounts for 80-8 percent of the total weight of the limestone5 percent, in the embodiment, the percentage of the fine grinding powder with the granularity less than or equal to 3mm in the limestone mineral accounts for 90 percent of the total weight of the limestone.
Further: the potassium, sodium and fluorine iron ore concentrate comprises the following chemical components in percentage by weight: 65.0 to 66.6 percent of TFe, 27.0 to 31.0 percent of FeO, 0.87 to 1.30 percent of MgO, 0.8 to 1.95 percent of CaO, and Al2O3≤0.2％，SiO21.05 to 2.04%, K2O≤0.15％，Na20.05 to 0.20 percent of O and 0.25 to 0.50 percent of F; the percentage of the concentrate with the granularity less than or equal to 0.074mm in the first iron concentrate to the total weight of the first iron concentrate is at least 90 percent;
further: the Australian No. 1 powder comprises the following chemical components in percentage by weight: 59.5 to 61.5 percent of TFe, less than or equal to 0.5 percent of FeO, 0.10 to 0.20 percent of MgO, 0.01 to 0.15 percent of CaO, and Al2O32.0-2.5% of SiO23.5-4.5%, K2O≤0.02％，Na2O is less than or equal to 0.02 percent, and F is less than or equal to 0.05 percent; the percentage of the concentrate with the granularity less than or equal to 3mm in the No. 1 Australian powder in the total weight of the No. 1 Australian powder is 50-55%;
further: the Australian powder No. 2 comprises the following chemical components in percentage by weight: 58.0 to 58.30 percent of TFe, less than or equal to 0.5 percent of FeO, 0.05 to 0.10 percent of MgO, 0.01 to 0.10 percent of CaO, and Al2O3≤2.2-2.6％，SiO25.0-5.5%, K2O≤0.02％，Na2O is less than or equal to 0.02 percent, and F is less than or equal to 0.05 percent; the percentage of the concentrate with the granularity less than or equal to 3mm in the No. 2 Australian powder in the total weight of the No. 2 Australian powder is 45-50%;
further: the quick lime comprises the following components in percentage by weight: SiO 22≤4.0％，CaO≥84％，MgO≥3.5％，Al2O3More than or equal to 12 percent, wherein the percentage of the fine grinding powder with the granularity less than or equal to 3mm in the quicklime mineral accounts for 100 percent of the total weight of the quicklime;
further: the dolomite comprises the following components in percentage by weight: SiO 22Not more than 2.0 percent, not less than 29.0 percent of CaO, not less than 20 percent of MgO, not more than 40 percent of Ig, and the percentage of the fine ground powder with the granularity not more than 3mm in the digested dolomite in the total weight of the digested dolomite is not less than 85 percent;
further: the limestone comprises the following components in percentage by weight: SiO 22Not more than 3.0 percent, not less than 50.0 percent of CaO, not less than 1.0 percent of MgO, not more than 42 percent of Ig, and the percentage of the fine grinding powder with the granularity not more than 3mm in the limestone mineral in the comparative example accounts for 80-85 percent of the total weight of the limestone, and the percentage of the fine grinding powder with the granularity not more than 3mm in the limestone mineral in the example accounts for 90 percent of the total weight of the limestone;
further: the coke powder comprises the following components in percentage by weight: SiO 22Not more than 8.0 percent, not less than 85.0 percent of fixed carbon, not more than 1.00 percent of CaO, not less than 85.0 percent of Ig, wherein the percentage of the fine grinding powder with the granularity not more than 3mm in the limestone minerals accounts for not less than 85 percent of the total weight of the limestone;
further: the serpentine comprises the following components in percentage by weight: SiO 2235.0 percent or more, 35.0 percent or more of MgO, 1.00 percent or less of CaO and 13.0 percent or less of Ig. Based on the requirement of improving the quality index of sintered ore, the percentage of the fine grinding powder with the original granularity of less than or equal to 3mm in the serpentine mineral to the total weight of the serpentine is 100 percent;
further: according to the weight percentage, the concentrate containing potassium, sodium and fluorine iron is 42 percent, the No. 1 Australian powder is 43 percent, the No. 2 Australian powder is 15 percent, the limestone is 6.6 percent, the quicklime is 5.0 percent, the composite flux is 1.9 percent, the dolomite is 1.2 percent, and the coke powder proportion is 4.15 percent.
A method for improving the quality of a high-proportion potassium, sodium and fluorine-iron ore concentrate sintered ore by optimizing limestone granularity comprises the following steps:
the preparation of the iron-containing raw material and the flux is realized according to the proportion, the raw material and the flux are fully mixed in a primary mixer to obtain a mixture, and the mixture is granulated in a granulator;
further: and (3) loading the mixture into a sintering device through a material distribution device.
Further: and (3) igniting, sintering, cooling and the like the raw mixture by a sintering machine to finally obtain the sintered ore of the limestone granularity improved and added high-proportion potassium, sodium and fluorine iron ore concentrate sintered ore.
Further: the ignition conditions are as follows: the temperature is 950-1050 ℃. The sintering conditions are as follows: the material layer thickness is 690-710mm, the vertical sintering speed is 22 +/-1 mm/min, the main pipe negative pressure is 10-11.5Kpa, and the end point temperature is 320-350 ℃.
Further: the potassium, sodium and fluorine iron ore concentrate comprises the following chemical components in percentage by weight: 65.0 to 66.6 percent of TFe, 27.0 to 31.0 percent of FeO, 0.87 to 1.30 percent of MgO, 0.8 to 1.95 percent of CaO, and Al2O3≤0.2％，SiO21.05 to 2.04%, K2O≤0.15％，Na20.05 to 0.20 percent of O and 0.25 to 0.50 percent of F; the percentage of the concentrate with the granularity less than or equal to 0.074mm in the first iron concentrate to the total weight of the first iron concentrate is at least 90 percent;
further: the Australian No. 1 powder comprises the following chemical components in percentage by weight: 59.5 to 61.5 percent of TFe, less than or equal to 0.5 percent of FeO, 0.10 to 0.20 percent of MgO, 0.01 to 0.15 percent of CaO, and Al2O32.0-2.5% of SiO23.5-4.5%, K2O≤0.02％，Na2O is less than or equal to 0.02 percent, and F is less than or equal to 0.05 percent; the percentage of the concentrate with the granularity less than or equal to 3mm in the No. 1 Australian powder in the total weight of the No. 1 Australian powder is 50-55%;
further: the Australian powder No. 2 comprises the following chemical components in percentage by weight: 58.0 to 58.30 percent of TFe, less than or equal to 0.5 percent of FeO, 0.05 to 0.10 percent of MgO, 0.01 to 0.10 percent of CaO, and Al2O3≤2.2-2.6％，SiO25.0-5.5%, K2O≤0.02％，Na2O is less than or equal to 0.02 percent, and F is less than or equal to 0.05 percent; the percentage of the concentrate with the granularity less than or equal to 3mm in the No. 2 Australian powder in the total weight of the No. 2 Australian powder is 45-50%;
further: the quick lime comprises the following components in percentage by weight: SiO 22≤4.0％，CaO≥84％，MgO≥3.5％，Al2O3More than or equal to 12 percent, wherein the percentage of the fine grinding powder with the granularity less than or equal to 3mm in the quicklime mineral accounts for 100 percent of the total weight of the quicklime;
further: the dolomite comprises the following components in percentage by weight: SiO 22Not more than 2.0 percent, not less than 29.0 percent of CaO, not less than 20 percent of MgO, not more than 40 percent of Ig, and the percentage of the fine ground powder with the granularity not more than 3mm in the digested dolomite in the total weight of the digested dolomite is not less than 85 percent;
further: saidThe limestone comprises the following components in percentage by weight: SiO 22Not more than 3.0 percent, not less than 50.0 percent of CaO, not less than 1.0 percent of MgO, not more than 42 percent of Ig, and the percentage of the fine grinding powder with the granularity not more than 3mm in the limestone mineral in the comparative example accounts for 80-85 percent of the total weight of the limestone, and the percentage of the fine grinding powder with the granularity not more than 3mm in the limestone mineral in the example accounts for 90 percent of the total weight of the limestone;
further: the coke powder comprises the following components in percentage by weight: SiO 22Not more than 8.0 percent, not less than 85.0 percent of fixed carbon, not more than 1.00 percent of CaO, not less than 85.0 percent of Ig, wherein the percentage of the fine grinding powder with the granularity not more than 3mm in the limestone minerals accounts for not less than 85 percent of the total weight of the limestone;
further: the serpentine comprises the following components in percentage by weight: SiO 2235.0 percent or more, 35.0 percent or more of MgO, 1.00 percent or less of CaO and 13.0 percent or less of Ig. Based on the requirement of improving the quality index of sintered ore, the percentage of the fine grinding powder with the original granularity of less than or equal to 3mm in the serpentine mineral to the total weight of the serpentine is 100 percent;
further: according to weight percentage, the content of K2O、Na2O, F iron ore concentrate 42%, Australian No. 1 powder 43%, Australian No. 2 powder 15%, limestone 6.6%, quicklime 5.0%, composite flux 1.9%, dolomite 1.2%, and coke powder 4.15%.
Compared with the prior art, the invention has the beneficial technical effects that:
aiming at the actual situation that the high-proportion potassium, sodium and fluorine iron-containing concentrates of ladle steel are main adhesion powder for ladle steel sintering to produce sinter, the mineralization reaction of the limestone and the potassium, sodium and fluorine iron-containing concentrates is realized in the sintering process by optimizing the granularity of limestone, so that the quality index of the high-proportion potassium, sodium and fluorine iron-containing concentrates of the additive is improved.
Detailed Description
The following examples are provided to further illustrate the embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
The raw material composition, raw material configuration, finished product ore composition, sintering process index, sintered ore metallurgical property and composite flux cost reduction measurement of sintered ore produced in the comparative example and the example are respectively shown in tables 1 to 6.
Table 1 raw material chemical composition%
Figure BDA0003524548910000061
TABLE 2 raw material configuration scheme of examples and comparative examples
Figure BDA0003524548910000062
The difference between the example and the comparative example is that the limestone granularity is controlled to be less than 3 mm.
TABLE 3 examples and comparative examples sinter minerals chemical compositions
Figure BDA0003524548910000063
TABLE 4 indexes of sintering process of examples and comparative examples
Figure BDA0003524548910000071
As can be seen from the above table:
(1) the vertical speed of the sintering ore gradually decreases from 84% to 90%, 95% and 100% with the proportion of limestone less than 3mm, but can be stabilized at 21.5mm/mim +/-0.5 mm/mim.
(2) On the premise of stable vertical speed control and unchanged water carbon, the proportion of limestone less than 3mm is gradually increased from 84% to 90%, 95% and 100%, the finished product rate of sintering ore is increased, the fuel consumption is reduced, and the total drum strength is increased.
(3) When the proportion of limestone is less than 3mm, the percentage is gradually increased from 84% to 90%, the sintering yield is increased by 0.21%, the fuel consumption is reduced by 0.61kg/t, the drum strength is increased by 0.13%, and when the proportion of limestone is less than 3mm, the percentage is gradually increased from 84% to 100%, the percentage is increased by 0.79%, the fuel consumption is reduced by 0.83kg/t, and the drum strength is increased by 0.4%.
In conclusion, the limestone particle size is optimized to realize that the limestone completely mineralizes the potassium, sodium and fluorine-iron-containing concentrate in the sintering process, so that the quality index of the sintered mineral product of the potassium, sodium and fluorine-iron-containing concentrate with high proportion is improved.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (8)

1. A control method for producing limestone particle size for sinter by adding high-proportion potassium, sodium and fluorine iron ore concentrate is characterized in that: the raw materials comprise the following components in percentage by weight: containing K2O、Na2O, F low SiO240-50% of iron ore concentrate, 30-45% of No. 1 Australian powder, 10-15% of No. 2 Australian powder and sintered ore SiO2The content is controlled to be 5.0% +/-0.1%, the content of CaO in the sinter is controlled to be 10.2% +/-0.1%, the content of MgO in the sinter is controlled to be 2.0% +/-0.1%, the proportion of coke powder is 4.10-4.20%, the externally added quicklime is 4.0-6.0%, and the externally added limestone is 5.5-7.5%;
the percentage of the fine grinding powder with the granularity less than or equal to 3mm in the limestone to the total weight of the limestone is more than or equal to 85 percent;
the preparation of the iron-containing raw material and the flux is realized according to the proportion, the raw material and the flux are fully mixed in a primary mixer to obtain a mixture, and the mixture is granulated in a granulator; loading the mixture into a sintering device through a material distribution device; igniting, sintering and cooling the raw mixture by a sintering machine to finally obtain a sintered ore of the limestone granularity improved and added high-proportion potassium, sodium and fluorine iron ore concentrate sintered ore; the ignition conditions are as follows: the temperature is 950 ℃ and 1050 ℃. The sintering conditions are as follows: the material layer thickness is 690-710mm, the vertical sintering speed is 22 +/-1 mm/min, the main pipe negative pressure is 10-11.5Kpa, and the end point temperature is 320-350 ℃.
2. Root of herbaceous plantThe method for controlling the particle size of limestone for producing sintering ore by adding high-proportion potassium, sodium and fluorine iron ore concentrate according to claim 1, is characterized in that: the potassium, sodium and fluorine iron ore concentrate comprises the following chemical components in percentage by weight: 65.0 to 66.6 percent of TFe, 27.0 to 31.0 percent of FeO, 0.87 to 1.30 percent of MgO, 0.8 to 1.95 percent of CaO, and Al2O3≤0.2％，SiO21.05 to 2.04%, K2O≤0.15％，Na20.05 to 0.20 percent of O and 0.25 to 0.50 percent of F; and the concentrate with the granularity less than or equal to 0.074mm in the first iron concentrate accounts for at least 90 percent of the total weight of the first iron concentrate.
3. The method for controlling the particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron ore concentrate according to claim 1, is characterized in that: the Australian No. 1 powder comprises the following chemical components in percentage by weight: 59.5 to 61.5 percent of TFe, less than or equal to 0.5 percent of FeO, 0.10 to 0.20 percent of MgO, 0.01 to 0.15 percent of CaO, and Al2O32.0-2.5% of SiO23.5-4.5%, K2O≤0.02％，Na2O is less than or equal to 0.02 percent, and F is less than or equal to 0.05 percent; and the percentage of the concentrate with the granularity less than or equal to 3mm in the No. 1 Australian powder in the total weight of the No. 1 Australian powder is 50-55%.
4. The method for controlling the particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron ore concentrate according to claim 1, is characterized in that: the Australian powder No. 2 comprises the following chemical components in percentage by weight: 58.0 to 58.30 percent of TFe, less than or equal to 0.5 percent of FeO, 0.05 to 0.10 percent of MgO, 0.01 to 0.10 percent of CaO, and Al2O3≤2.2-2.6％，SiO25.0-5.5%, K2O≤0.02％，Na2O is less than or equal to 0.02 percent, and F is less than or equal to 0.05 percent; and the percentage of the concentrate with the granularity less than or equal to 3mm in the No. 2 Australian powder in the total weight of the No. 2 Australian powder is 45-50%.
5. The method for controlling the particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron ore concentrate according to claim 1, is characterized in that: the quick lime comprises the following components in percentage by weight:SiO2≤4.0％，CaO≥84％，MgO≥3.5％，Al2O3more than or equal to 12 percent, and the percentage of the fine grinding powder with the granularity less than or equal to 3mm in the quicklime mineral accounts for 100 percent of the total weight of the quicklime.
6. The method for controlling the particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron ore concentrate according to claim 1, is characterized in that: the limestone comprises the following components in percentage by weight: SiO 22Not more than 3.0 percent, not less than 50.0 percent of CaO, not less than 1.0 percent of MgO, not more than 42 percent of Ig, and the percentage of the fine grinding powder with the granularity not more than 3mm in the limestone minerals accounts for 90 percent of the total weight of the limestone.
7. The method for controlling the particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron ore concentrate according to claim 1, is characterized in that: the coke powder comprises the following components in percentage by weight: SiO 22Not more than 8.0 percent, not less than 85.0 percent of fixed carbon, not more than 1.00 percent of CaO and not more than 85.0 percent of Ig.
8. The method for controlling the particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron ore concentrate according to claim 1, is characterized in that: according to the weight percentage, the concentrate containing potassium, sodium and fluorine iron is 42%, the No. 1 Australian powder is 43%, the No. 2 Australian powder is 15%, the limestone is 6.6%, the quicklime is 5.0%, the serpentine is 1.2%, the dolomite is 1.4%, and the coke powder is 4.15%.
CN202210188320.9A 2022-02-28 2022-02-28 Method for controlling particle size of limestone for producing sintered ore by adding high-proportion potassium, sodium and fluorine iron concentrate Pending CN114622088A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04160107A (en) * 1990-10-23 1992-06-03 Nippon Steel Corp Manganese sintered ore for steel refining and its production
CN102443693A (en) * 2011-12-08 2012-05-09 攀钢集团研究院有限公司 Sintering method of high-grade high-titania vanadium-titanium magnetite concentrate
CN103320606A (en) * 2013-06-27 2013-09-25 攀钢集团攀枝花钢钒有限公司 Method for enhancing mineralization reaction effect of sintered iron ores
CN107641709A (en) * 2017-09-30 2018-01-30 四川德胜集团钒钛有限公司 A kind of sintering method for reducing burnup
CN112195337A (en) * 2020-09-25 2021-01-08 包头钢铁（集团）有限责任公司 Sintered ore for improving production quality by controlling grain size of high-silicon flux and preparation method thereof
CN113817919A (en) * 2021-08-05 2021-12-21 包头钢铁（集团）有限责任公司 Sintered ore for improving production quality by controlling grain size of high-silicon flux and method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04160107A (en) * 1990-10-23 1992-06-03 Nippon Steel Corp Manganese sintered ore for steel refining and its production
CN102443693A (en) * 2011-12-08 2012-05-09 攀钢集团研究院有限公司 Sintering method of high-grade high-titania vanadium-titanium magnetite concentrate
CN103320606A (en) * 2013-06-27 2013-09-25 攀钢集团攀枝花钢钒有限公司 Method for enhancing mineralization reaction effect of sintered iron ores
CN107641709A (en) * 2017-09-30 2018-01-30 四川德胜集团钒钛有限公司 A kind of sintering method for reducing burnup
CN112195337A (en) * 2020-09-25 2021-01-08 包头钢铁（集团）有限责任公司 Sintered ore for improving production quality by controlling grain size of high-silicon flux and preparation method thereof
CN113817919A (en) * 2021-08-05 2021-12-21 包头钢铁（集团）有限责任公司 Sintered ore for improving production quality by controlling grain size of high-silicon flux and method thereof

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