CN103849759B - Roasting method of efficiently controlling iron ores to be magnetized - Google Patents

Roasting method of efficiently controlling iron ores to be magnetized Download PDF

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CN103849759B
CN103849759B CN201410041581.3A CN201410041581A CN103849759B CN 103849759 B CN103849759 B CN 103849759B CN 201410041581 A CN201410041581 A CN 201410041581A CN 103849759 B CN103849759 B CN 103849759B
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iron ore
reducing gas
shaft furnace
ejection
gas
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CN103849759A (en
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王明华
张志刚
展仁礼
权芳民
马胜军
李慧春
郭忆
张科
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Jiuquan Iron and Steel Group Co Ltd
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Jiuquan Iron and Steel Group Co Ltd
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Abstract

The invention relates to a roasting method of efficiently controlling iron ores to be magnetized. The method comprises the following steps: by virtue of agile adjustment of components, flow and pressure of reduced gas, improving the content of hydrogen in the reduced gas; controlling the content of hydrogen at 15%+/-3%; greatly improving the diffusivity and thermal conductance of the reduced gas; obtaining the optimal effect of the roasting method of efficiently controlling iron ores to be magnetized. Meanwhile, aiming at the problem that the reduced gas in the roasting method excessive, the reduced gas is reduced from 1800-2000m<3>/h to 1000-1200m<3>/h, the consumption of the reduced gas is reduced by 800m<3>/h, the production cost is lowered, and the environmental pollution by CO in exhaust gases in a shaft furnace is eliminated. The reducing temperature of the iron ores is improved to 680-720 DEG C, and a good reducing temperature is provided for reducing block iron ores. Meanwhile, the pressure of the reduced gas is controlled at 5000Pa+/200Pa, so that the iron ores can be fully and uniformly roasted.

Description

The magnetized roasting method of a kind of efficient control iron ore
Technical field
The invention belongs to iron mineral roasting technology field, be specifically related to the magnetized roasting method of a kind of efficient control iron ore.
Background technology
Shaft furnace mainly processes a kind of type of furnace of lump ore, and utilizing shaft furnace to carry out large-scale industry magnetizing roasting production is be established in China Anshan nineteen twenty-six, therefore is called " Anshan type shaft furnace ".Magnetic roasting shaft furnace be by ore in shaft furnace, after being heated to certain temperature by preheating section, heating zone, physical-chemical reaction is carried out in the reducing atmosphere of reduction section, the Iron Oxide Minerals such as the rhombohedral iron ore of weak magnetic are made to change ferromagnetic magnetite into, a kind of device of available weak magnetic separation method process after overcooling.
Jiu Gangxuanshao factory builds 44 100m 3anshan type shaft furnace, defines the classification sinter process of current roasting 50 ~ 100mm bulk iron ore, 15 ~ 50mm small bits of iron ore, has reached the scale of year process 5,000,000 tons, raw ore.Production practice prove that the iron ore this roasting method recovery time reaches 4 hours, and reduction section iron ore temperature only has 550 ~ 600 DEG C, and reducing gas consumption reaches 1800 ~ 2000m 3/ h, reducing gas unit consumption is up to 1.3GJ/t ore, and in tail gas, obnoxious flavour content is higher, and the method reduction of iron ore time is long, the lack of homogeneity of ore magnetizing roasting, and above series of problems has become the bottleneck problem of restriction wine steel shaft furnace production.
Summary of the invention
The shortcoming that technical problem to be solved by this invention is the lack of homogeneity of, ore magnetizing roasting long for the recovery time in iron ore roasting process in prior art, obnoxious flavour content is higher in tail gas and provide a kind of and efficiently control the magnetized roasting method of iron ore.
Following technical scheme is adopted for solving technical problem of the present invention:
The magnetized roasting method of a kind of efficient control iron ore, the first step iron ore is added from shaft furnace top by the distributor of shaft furnace; Second step, iron ore carries out drying, preheating through the preheating section of shaft furnace; 3rd step, iron ore carries out heating, heating up at the burner of shaft furnace through the heating zone of shaft furnace; 4th step, iron ore reduces through the reducing gas of the reducing gas ejection tower ejection of the reduction section shaft furnace of shaft furnace; 5th step, iron ore to be entered in cooling basin by the Mineral Ejection Roll of shaft furnace through cooling section and carries out cooling, lowering the temperature, and going back reduction temperature in described 4th step is 680 ~ 720 DEG C, and the recovery time is 1 ~ 1.5h, and reducing gas is CO and H 2mixed gas, the H wherein in reducing gas 2volume fraction is 15% ± 3%, and the flow of the reducing gas of reducing gas ejection tower ejection is 1000 ~ 1200m 3/ h, the pressure of the reducing gas of ejection is 5000Pa ± 200Pa.
Described iron ore granularity is 15 ~ 100mm.
Described iron ore is limonite mFe 2o 3.nH 2o and rhombohedral iron ore Fe 2o 3.
The reducing gas system of the heating gas system of the heating zone of described shaft furnace and the reduction section of shaft furnace is independently arranged, described reducing gas Operation system setting reducing gas pressurization hybrid station, described heating gas Operation system setting heating gas pressurization hybrid station.
The latus rectum of the spray nozzle of the reducing gas ejection tower used in described 4th step is 22mm × 85mm.
Theoretical foundation: the present invention is directed to Problems existing in the iron ore roasting method described in background technology, for improving lump ore shaft furnace magnetizing roasting process, our the systematic research processing parameters such as magnetizing roasting temperature, lump ore granularity, reducing gas composition and magnetizing roasting time, sum up the influence factor to lump ore shaft furnace magnetizing roasting process.
1, CO and H in reducing gas 2content is on the impact of lump ore magnetizing roasting process
The magnetizing roasting test that lump ore granularity is 55 ~ 65mm is carried out, by H under the precondition that magnetizing roasting temperature and magnetizing roasting time are controlled as 700 DEG C and 90min 2and N 2h in the reducing gas of composition 2the impact of content on lump ore shaft furnace magnetizing roasting process is shown in shown in Fig. 1 and Fig. 2.By CO, CO 2and N 2in the reducing gas of composition, the impact of CO content on lump ore shaft furnace magnetizing roasting process is shown in shown in Fig. 3 to Fig. 4.
Because the atomic radius of hydrogen is very little, the diffusibility in massive iron ore roasting process is very strong, H in theory 2velocity of diffusion be 3.74 times of CO velocity of diffusion, greatly improve the dynamic conditions in massive iron ore roasting process; Meanwhile, H 2heat conductivility also very good, H in theory 2the capacity of heat transmission be 7 to 10 times of the CO capacity of heat transmission, in massive iron ore roasting process, improve the temperature at massive iron ore center fast, impel the decomposition of spathic iron ore in massive iron ore, thus improve lump iron ores petrochemical industry roasting process.Therefore, H in reducing gas can suitably be improved in massive iron ore roasting process 2content, reduces CO content, and by H 2content brings up to 15% ± 3%, obtains best massive iron ore roasting effect.
2, the magnetizing roasting time is on the impact of lump ore shaft furnace magnetizing roasting process
H is controlled as at reducing gas composition and magnetizing roasting temperature 2/ N 2the roasting test that massive iron ore granularity is 55 ~ 65mm is carried out under the precondition of=15/85 and 700 DEG C, the impact of roasting time on massive iron ore roasting process is shown in shown in Fig. 5 and Fig. 6, as can be known from Fig. 5 and Fig. 6: massive iron ore roasting time is controlled relatively to be suitable between 60min to 90min, during this to massive iron ore center iron mineral reduction reaction interface H 2velocity of diffusion, heat conductivility constantly increase, thus cause the homogeneity of massive iron ore roasting to improve.Improve the homogeneity of massive iron ore roasting preferably.
The present invention is independently arranged by reducing gas system in iron ore roasting method and heating gas system, realize the composition of reducing gas, flow, pressure flexible, improve the content of hydrogen in reducing gas, hydrogen content is controlled 15% ± 3%, increase substantially diffusibility and the capacity of heat transmission of reducing gas, obtain best shaft furnace and efficiently control the magnetized roasting method effect of iron ore.Simultaneously for the problem of reducing gas surplus in roasting method, by reducing gas from 1800 ~ 2000m 3/ h is reduced to 1000 ~ 1200m 3/ h, reduces reducing gas consumption 800m 3/ h, reduces production cost, to eliminate in furnace waste gas CO to the pollution of environment.Reduction of iron ore temperature is brought up to 680 ~ 720 DEG C, for massive iron ore reduction provide better reduction temperature, simultaneously by reducing gas pressure-controlling at 5000Pa ± 200Pa, achieve iron ore and fully, uniformly can complete roasting process.After reducing reducing gas usage quantity, for ensureing the stability of pressure and the homogeneity of ejection, shaft furnace of the present invention reduces the nozzle latus rectum of reducing gas ejection tower.
Accompanying drawing explanation
Fig. 1 is H in reducing gas 2content is to the effect diagram of lump ore shaft furnace magnetizing roasting process;
Fig. 2 is reducing gas H 2content is to the effect diagram of lump ore top layer and lump ore center magnetization rate difference;
Fig. 3 be in reducing gas CO content to the effect diagram of lump ore shaft furnace magnetizing roasting process;
Fig. 4 is reducing gas CO content to the effect diagram of lump ore top layer and lump ore center magnetization rate difference;
Fig. 5 is the effect diagram of magnetizing roasting time to lump ore shaft furnace magnetizing roasting process;
Fig. 6 is the magnetizing roasting time to the effect diagram of lump ore top layer and lump ore center magnetization rate difference.
Embodiment
The shaft furnace that the magnetized roasting method of a kind of efficient control iron ore uses, the reducing gas system of the heating gas system of the heating zone of shaft furnace and the reduction section of shaft furnace is independently arranged, reducing gas Operation system setting reducing gas pressurization hybrid station, heating gas Operation system setting heating gas pressurization hybrid station.The latus rectum of the spray nozzle of the reducing gas ejection tower of the shaft furnace used is 22mm × 85mm.
embodiment 1
The magnetized roasting method of a kind of efficient control iron ore, the first step limonite mFe 2o 3.nH 2o is added from shaft furnace top by the distributor of shaft furnace, limonite mFe 2o 3.nH 2o granularity is 15mm; Second step, iron ore carries out drying, preheating through the preheating section of shaft furnace; 3rd step, iron ore carries out heating, heating up at the burner of shaft furnace through the heating zone of shaft furnace; 4th step, iron ore reduces through the reducing gas of the reducing gas ejection tower ejection of the reduction section shaft furnace of shaft furnace; Reduction temperature is 720 DEG C, and the recovery time is 1h, and reducing gas is CO and H 2mixed gas, the H wherein in reducing gas 2volume fraction is 15%, and the flow of the reducing gas of reducing gas ejection tower ejection is 1200m 3/ h, the pressure of the reducing gas of ejection is 5000Pa; 5th step, iron ore to be entered in cooling basin by the Mineral Ejection Roll of shaft furnace through cooling section and carries out cooling, lowering the temperature.
embodiment 2
The magnetized roasting method of a kind of efficient control iron ore, the first step rhombohedral iron ore Fe 2o 3added from shaft furnace top by the distributor of shaft furnace, rhombohedral iron ore Fe 2o 3granularity is 100mm; Second step, iron ore carries out drying, preheating through the preheating section of shaft furnace; 3rd step, iron ore carries out heating, heating up at the burner of shaft furnace through the heating zone of shaft furnace; 4th step, iron ore reduces through the reducing gas of the reducing gas ejection tower ejection of the reduction section shaft furnace of shaft furnace; Reduction temperature is 700 DEG C, and the recovery time is 1.25h, and reducing gas is CO and H 2mixed gas, the H wherein in reducing gas 2volume fraction is 18%, and the flow of the reducing gas of reducing gas ejection tower ejection is 1000m 3/ h, the pressure of the reducing gas of ejection is 5200Pa; 5th step, iron ore to be entered in cooling basin by the Mineral Ejection Roll of shaft furnace through cooling section and carries out cooling, lowering the temperature.
embodiment 3
The magnetized roasting method of a kind of efficient control iron ore, the first step rhombohedral iron ore Fe 2o 3added from shaft furnace top by the distributor of shaft furnace, rhombohedral iron ore Fe 2o 3granularity is 100mm; Second step, iron ore carries out drying, preheating through the preheating section of shaft furnace; 3rd step, iron ore carries out heating, heating up at the burner of shaft furnace through the heating zone of shaft furnace; 4th step, iron ore reduces through the reducing gas of the reducing gas ejection tower ejection of the reduction section shaft furnace of shaft furnace; Reduction temperature is 680 DEG C, and the recovery time is 1.5h, and reducing gas is CO and H 2mixed gas, the H wherein in reducing gas 2volume fraction is 12%, and the flow of the reducing gas of reducing gas ejection tower ejection is 1100m 3/ h, the pressure of the reducing gas of ejection is 4800Pa; 5th step, iron ore to be entered in cooling basin by the Mineral Ejection Roll of shaft furnace through cooling section and carries out cooling, lowering the temperature.

Claims (4)

1. the magnetized roasting method of efficient control iron ore, the first step iron ore is added from shaft furnace top by the distributor of shaft furnace, and described iron ore granularity is 15 ~ 100mm; Second step, iron ore carries out drying, preheating through the preheating section of shaft furnace; 3rd step, iron ore carries out heating, heating up at the burner of shaft furnace through the heating zone of shaft furnace; 4th step, iron ore reduces through the reducing gas of the reducing gas ejection tower ejection of the reduction section shaft furnace of shaft furnace; 5th step, iron ore to be entered in cooling basin by the Mineral Ejection Roll of shaft furnace through cooling section and carries out cooling, lowering the temperature, and it is characterized in that: in described 4th step, reduction temperature is 680 ~ 720 DEG C, and the recovery time is 1 ~ 1.5h, and reducing gas is CO and H 2mixed gas, the H wherein in reducing gas 2volume fraction is 15% ± 3%, and the flow of the reducing gas of reducing gas ejection tower ejection is 1000 ~ 1200m 3/ h, the pressure of the reducing gas of ejection is 5000Pa ± 200Pa.
2. one according to claim 1 efficiently controls the magnetized roasting method of iron ore, it is characterized in that: described iron ore is limonite mFe 2o 3.nH 2o and rhombohedral iron ore Fe 2o 3.
3. one according to claim 1 and 2 efficiently controls the magnetized roasting method of iron ore, it is characterized in that: the reducing gas system of the heating gas system of the heating zone of described shaft furnace and the reduction section of shaft furnace is independently arranged, described reducing gas Operation system setting reducing gas pressurization hybrid station, described heating gas Operation system setting heating gas pressurization hybrid station.
4. one according to claim 3 efficiently controls the magnetized roasting method of iron ore, it is characterized in that: the latus rectum of the spray nozzle of the reducing gas ejection tower used in described 4th step is 22mm × 85mm.
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CN104745806B (en) * 2015-04-03 2017-03-01 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of difficulty selects iron ore of low ore grade shaft furnace with addition of semi-coke magnetic roasting process
CN108950179B (en) * 2018-06-15 2020-07-03 甘肃酒钢集团宏兴钢铁股份有限公司 Low-temperature hydrogen reduction magnetizing roasting process for refractory iron ore

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* Cited by examiner, † Cited by third party
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CN102747217A (en) * 2012-06-14 2012-10-24 甘肃酒钢集团宏兴钢铁股份有限公司 Grading technology for cold-pressed pelletizing and shaft furnace magnetization roasting of powdery refractory iron oxide ore
CN103205561A (en) * 2013-03-18 2013-07-17 酒泉钢铁(集团)有限责任公司 Coal-based magnetic roasting method for powdery refractory low-grade iron ore carbon-bearing pellets by pellet shaft furnace

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102747217A (en) * 2012-06-14 2012-10-24 甘肃酒钢集团宏兴钢铁股份有限公司 Grading technology for cold-pressed pelletizing and shaft furnace magnetization roasting of powdery refractory iron oxide ore
CN103205561A (en) * 2013-03-18 2013-07-17 酒泉钢铁(集团)有限责任公司 Coal-based magnetic roasting method for powdery refractory low-grade iron ore carbon-bearing pellets by pellet shaft furnace

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