CN103849759A - Roasting method of efficiently controlling iron ores to be magnetized - Google Patents
Roasting method of efficiently controlling iron ores to be magnetized Download PDFInfo
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- CN103849759A CN103849759A CN201410041581.3A CN201410041581A CN103849759A CN 103849759 A CN103849759 A CN 103849759A CN 201410041581 A CN201410041581 A CN 201410041581A CN 103849759 A CN103849759 A CN 103849759A
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- iron ore
- reducing gas
- shaft furnace
- ejection
- roasting method
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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
Technical field
The invention belongs to iron mineral roasting technology field, be specifically related to a kind of efficient magnetized roasting method of iron ore of controlling.
Background technology
Shaft furnace is mainly a kind of type of furnace of processing lump ore, and utilizing shaft furnace to carry out large-scale industry magnetizing roasting production is to be established in China Anshan nineteen twenty-six, therefore be called " Anshan type shaft furnace ".Magnetic roasting shaft furnace be by ore in shaft furnace, be heated to after certain temperature by preheating section, heating zone, in the reducing atmosphere of reduction section, carry out physical-chemical reaction, make the Iron Oxide Minerals such as rhombohedral iron ore of weak magnetic change ferromagnetic magnetite into, a kind of device of available weak magnetic separation method processing after overcooling.
Jiu Gangxuanshao factory builds 44 100m
3anshan type shaft furnace, has formed 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 processing 5,000,000 tons, raw ore.The production practice proof this roasting method recovery time of iron ore reached about 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, above series of problems has become the bottleneck problem of restriction wine steel shaft furnace production.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of efficient magnetized roasting method of iron ore of controlling compared with high shortcoming for obnoxious flavour content in the lack of homogeneity of recovery time length, ore magnetizing roasting in iron ore roasting process in prior art, tail gas.
Adopt following technical scheme for solving technical problem of the present invention:
A kind of efficient magnetized roasting method of iron ore of controlling, the first step iron ore is added from shaft furnace top by the distributor of shaft furnace; Second step, the preheating section of iron ore process shaft furnace is dried, preheating; The 3rd step, iron ore heats, heats up at the burner of shaft furnace through the heating zone of shaft furnace; The 4th step, iron ore reduces with the reducing gas of the reducing gas ejection tower ejection of shaft furnace through the reduction section of shaft furnace; The 5th step, iron ore is entered in cooling basin and is carried out cooling, cooling by the Mineral Ejection Roll of shaft furnace through cooling section, and in described the 4th step, going back 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 wherein H 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 independently arranges, and described reducing gas system arranges reducing gas pressurization and mixes station, and described heating gas system arranges heating gas pressurization and mixes station.
The latus rectum of the spray nozzle of the reducing gas ejection tower using in described the 4th step is 22mm × 85mm.
Theoretical foundation: the present invention is directed to the problem existing in the iron ore roasting method described in background technology, for improving lump ore shaft furnace magnetizing roasting process, our systematic research the 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
2the impact of content on lump ore magnetizing roasting process
Controlling respectively in magnetizing roasting temperature and magnetizing roasting time is to carry out the magnetizing roasting test that lump ore granularity is 55～65mm under the precondition of 700 DEG C and 90min, by H
2and N
2h in the reducing gas of composition
2content is shown in shown in Fig. 1 and Fig. 2 the impact of lump ore shaft furnace magnetizing roasting process.By CO, CO
2and N
2in the reducing gas of composition, CO content is shown in shown in Fig. 3 to Fig. 4 the impact of lump ore shaft furnace magnetizing roasting process.
Because the atomic radius of hydrogen is very little, the diffusibility in massive iron ore roasting process is very strong, in theory H
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 fast the temperature at massive iron ore center, impel the decomposition of spathic iron ore in massive iron ore, thereby improve massive iron ore roasting process.Therefore, in massive iron ore roasting process, can suitably improve reducing gas in H
2content, reduces CO content, and by H
2content brings up to 15% ± 3%, has obtained best massive iron ore roasting effect.
2, the impact of magnetizing roasting time on lump ore shaft furnace magnetizing roasting process
Control respectively as H at reducing gas composition and magnetizing roasting temperature
2/ N
2under the precondition of=15/85 and 700 DEG C, carry out the roasting test that massive iron ore granularity is 55～65mm, roasting time is shown in shown in Fig. 5 and Fig. 6 the impact of massive iron ore roasting process, as can be known from Fig. 5 and Fig. 6: it is more suitable that massive iron ore roasting time is controlled between 60min to 90min, during this to massive iron ore center iron mineral reduction reaction interface H
2velocity of diffusion, heat conductivility constantly increase, thereby cause the homogeneity of massive iron ore roasting to improve.Improve preferably the homogeneity of massive iron ore roasting.
The present invention independently arranges by reducing gas system in iron ore roasting method and heating gas system, realize composition, flow, the pressure flexible of reducing gas, improve the content of hydrogen in reducing gas, hydrogen content is controlled to 15% ± 3%, increase substantially diffusibility and the capacity of heat transmission of reducing gas, obtained best shaft furnace and efficiently controlled 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, has reduced production cost, has eliminated the pollution of CO to environment in furnace waste gas.Reduction of iron ore temperature is brought up to 680～720 DEG C, for massive iron ore reduction provides better reduction temperature, simultaneously by reducing gas pressure-controlling at 5000Pa ± 200Pa, realized iron ore and can complete fully, uniformly roasting process.Reduce after reducing gas usage quantity, for ensureing the stability of pressure and the homogeneity of ejection, shaft furnace of the present invention dwindles the nozzle latus rectum of reducing gas ejection tower.
Brief description of the drawings
Fig. 1 is H in reducing gas
2the affect figure of content on lump ore shaft furnace magnetizing roasting process;
Fig. 2 is reducing gas H
2the affect figure of content on lump ore top layer and lump ore center susceptibility difference;
Fig. 3 is the affect figure of CO content on lump ore shaft furnace magnetizing roasting process in reducing gas;
Fig. 4 is the affect figure of reducing gas CO content on lump ore top layer and lump ore center susceptibility difference;
Fig. 5 is the affect figure of magnetizing roasting time on lump ore shaft furnace magnetizing roasting process;
Fig. 6 is the affect figure of magnetizing roasting time on lump ore top layer and lump ore center susceptibility 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 independently arranges, reducing gas system arranges reducing gas pressurization and mixes station, and heating gas system arranges heating gas pressurization and mixes station.The latus rectum of the spray nozzle of the reducing gas ejection tower of the shaft furnace using is 22mm × 85mm.
embodiment 1
A kind of efficient magnetized roasting method of iron ore, the first step limonite mFe of controlling
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, the preheating section of iron ore process shaft furnace is dried, preheating; The 3rd step, iron ore heats, heats up at the burner of shaft furnace through the heating zone of shaft furnace; The 4th step, iron ore reduces with the reducing gas of the reducing gas ejection tower ejection of shaft furnace through the reduction section 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 wherein H 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; The 5th step, iron ore is entered and in cooling basin, is carried out cooling, cooling by the Mineral Ejection Roll of shaft furnace through cooling section.
embodiment 2
A kind of efficient magnetized roasting method of iron ore, the first step rhombohedral iron ore Fe of controlling
2o
3distributor by shaft furnace adds from shaft furnace top, rhombohedral iron ore Fe
2o
3granularity is 100mm; Second step, the preheating section of iron ore process shaft furnace is dried, preheating; The 3rd step, iron ore heats, heats up at the burner of shaft furnace through the heating zone of shaft furnace; The 4th step, iron ore reduces with the reducing gas of the reducing gas ejection tower ejection of shaft furnace through the reduction section 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 wherein H 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; The 5th step, iron ore is entered and in cooling basin, is carried out cooling, cooling by the Mineral Ejection Roll of shaft furnace through cooling section.
embodiment 3
A kind of efficient magnetized roasting method of iron ore, the first step rhombohedral iron ore Fe of controlling
2o
3distributor by shaft furnace adds from shaft furnace top, rhombohedral iron ore Fe
2o
3granularity is 100mm; Second step, the preheating section of iron ore process shaft furnace is dried, preheating; The 3rd step, iron ore heats, heats up at the burner of shaft furnace through the heating zone of shaft furnace; The 4th step, iron ore reduces with the reducing gas of the reducing gas ejection tower ejection of shaft furnace through the reduction section 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 wherein H 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; The 5th step, iron ore is entered and in cooling basin, is carried out cooling, cooling by the Mineral Ejection Roll of shaft furnace through cooling section.
Claims (5)
1. the efficient magnetized roasting method of iron ore of controlling, the first step iron ore is added from shaft furnace top by the distributor of shaft furnace; Second step, the preheating section of iron ore process shaft furnace is dried, preheating; The 3rd step, iron ore heats, heats up at the burner of shaft furnace through the heating zone of shaft furnace; The 4th step, iron ore reduces with the reducing gas of the reducing gas ejection tower ejection of shaft furnace through the reduction section of shaft furnace; The 5th step, iron ore is entered in cooling basin and is carried out cooling, cooling by the Mineral Ejection Roll of shaft furnace through cooling section, it is characterized in that: in described the 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 wherein H 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 is efficiently controlled the magnetized roasting method of iron ore, it is characterized in that: described iron ore granularity is 15～100mm.
3. one according to claim 1 and 2 is efficiently controlled 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.
4. one according to claim 3 is efficiently controlled 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 independently arranges, described reducing gas system arranges reducing gas pressurization and mixes station, and described heating gas system arranges heating gas pressurization and mixes station.
5. one according to claim 3 is efficiently controlled 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 using in described the 4th step is 22mm × 85mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104745806A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Refractory low-grade iron ore shaft furnace semi-coke added magnetizing roast process |
| CN108950179A (en) * | 2018-06-15 | 2018-12-07 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore low temperature reduction with hydrogen magnetic roasting process |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747217B (en) * | 2012-06-14 | 2016-06-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Powdery difficulty selects iron oxide ore cold-pressing balls agglomeration, shaft furnace magnetizing roasting sorting process |
| CN103205561B (en) * | 2013-03-18 | 2016-08-24 | 酒泉钢铁(集团)有限责任公司 | Powdery difficulty selects iron ore of low ore grade carbonaceous pelletizing coal-base shaft furnace magnetizing roast method |
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2014
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104745806A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Refractory low-grade iron ore shaft furnace semi-coke added magnetizing roast process |
| CN108950179A (en) * | 2018-06-15 | 2018-12-07 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore low temperature reduction with hydrogen 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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