CN1995411A - Process for producing iron finished ore powder utilizing low grade siderite - Google Patents
Process for producing iron finished ore powder utilizing low grade siderite Download PDFInfo
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- CN1995411A CN1995411A CN 200610022654 CN200610022654A CN1995411A CN 1995411 A CN1995411 A CN 1995411A CN 200610022654 CN200610022654 CN 200610022654 CN 200610022654 A CN200610022654 A CN 200610022654A CN 1995411 A CN1995411 A CN 1995411A
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- iron ore
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Abstract
The invention discloses a manufacturing technique of iron concentrate powder from low-grade siderite, which comprises the following steps: adopting low-grade siderite as raw material; breaking; sieving; obtaining the sintered ore with grain size at 10-40mm; adopting flue gas as fuel; proceeding magnetic sintering; transmitting FeCO3 in the siderite into Fe3O4; cooling the material below 300 deg. c due to isolating air; quenching; balling the sintered ore; proceeding magnetic sieve, stripping magnet-stripping and magnetic sieve with magnetic strength at 800-1000 oerst; obtaining the product.
Description
Affiliated field
The present invention relates to produce the technology of fine iron breeze, particularly utilize low-grade spathic iron ore to produce the technology of fine iron breeze.
Background technology
Along with developing rapidly of domestic Iron And Steel Industry, the iron ore deposit of domestic higher-grade, easily processing constantly reduces, and forces a large amount of imported iron ore stones of each big steel enterprise.Therefore, the domestic various poor iron ore deposits of rational exploitation and utilization are studied new poor iron ore processing treatment technology to produce the iron ore concentrate that is fit to market demands, the focus that fine ore becomes China's iron and steel mine industry once more, also are the only ways of sustainable development of iron and steel industry.Spathic iron ore is with FeCO
3Low-grade iron ore for main component, be to be only second to limonite, rhombohedral iron ore and pyritous iron ore deposit, China's spathic iron ore reserves are at the forefront in the world, proven reserve are about 1,800,000,000 tons, the spathic iron ore reserves are just verified more than 1,800 ten thousand tons in state, the Liangshan Mountain, Sichuan Province, west area only Huili County Feng Ying township, iron-holder 27～30%, detrimental impurity content is low, if can rational exploitation and utilization, not only can alleviate and climb steel and each pellet factory of Panzhihua City demand pressure common iron ore concentrate, also can drive local economic development, solving employment, cultivate new growth engines.
Because the theoretical grade of spathic iron ore only 48.2%, head grade 22～35% and often with isomorph symbiosis such as calcium, magnesium, manganese, so adopt the physical concentration method to be difficult to make iron concentrate grade to reach more than 45%.Less to the research report of spathic iron ore processing and utilization both at home and abroad, at home, Ma'an Mountain mine research institute carried out research to the recycling of iron carbonate mineral in high mouthful of iron ore mine of Taiyuan Iron and Steel Co.; Changsha Mining ﹠ Metallurgy Inst adopts the mode of coal-based rotary kiln magnetizing roasting to carry out type approval test to big Xigou ditch, Shaanxi spathic iron ore, has obtained certain test-results.Abroad, scholars have also done some researchs to spathic iron ore, have studied mixed carbon comtent, lime consumption, globule size and etc. to the influence of product performance; Investigated the FT-IR collection of illustrative plates of the iron ore that contains spathic iron ore, magnet and rhombohedral iron ore, found that spathic iron ore is very big to the sintering character influence of ore, 400 ℃ begin to decompose; Also studied the influence of the character, composition, mineralogical character, size distribution etc. of spathic iron ore to sintering etc.; To containing FeCO
3The sintering of 37% spathic iron ore studies show that oxidative phenomena appears in temperature when being higher than 380 ℃, generates Fe
2O
3Present whole technical study is because various places raw ore composition difference is bigger, thereby the operational path of various places and processing condition also differ bigger, can't directly quote.Adopting roasting-magnetic dressing process that raw ore is carried out enrichment has wide prospect, but mostly stays in laboratory or half type approval test stage because of the restriction of technology and production cost, rarely seen have utilize spathic iron ore to carry out industrial report fully.Therefore, strengthening the research to spathic iron ore magnetizing roasting technology, improve the ore dressing quality of magnetizing roasting product grade and product of roasting, reduce production costs, finally reach scale development production, is the inexorable trend of development and use spathic iron ore.
Summary of the invention
Purpose of the present invention promptly is to overcome the shortcoming of prior art, and a kind of production technique of utilizing to economic and reliable spathic iron ore to produce the fine iron breeze that is fit to the market requirement under the prerequisite of higher iron recovery is provided.
Purpose of the present invention is achieved through the following technical solutions: utilize low-grade spathic iron ore to produce the technology of fine iron breeze, it may further comprise the steps:
(1) fragmentation-screening: make raw material with low-grade spathic iron ore, after fragmentation-screening, get the roasting lump ore of granularity 10～40mm;
(2) rotary kiln baking: make fuel with coal gas, carry out magnetizing roasting in 520～600 ℃ of scopes, begin to be fed to discharging, the about 50～60min of roasting time makes the FeCO in the spathic iron ore
3Be converted into Fe
3O
4, other carbonate also produces certain decomposition, by the control calcination atmosphere, makes the decomposition of spathic iron ore mainly produce Fe
3O
4, CO
2And CO, its reaction product CO also can reduce to the rhombohedral iron ore and the limonite of association;
(3) cooling: temperature still had 400～500 ℃ when furnace charge was come out of the stove, and adopted below the air-isolation slow cooling to 300 ℃, and this heat energy is used for air and the combustion air that the preheating gas producer is used, shrend chilling again;
(4) ball milling-screening: roasted ore carries out magnetic separation-Tuo magnetic-magnetic separation behind ball milling, and magneticstrength 1000 and 800 oersteds get fine iron breeze.
By top narration as can be seen, the present invention has the following advantages: utilize spathic iron ore to carry out industrial production fully, improved the ore dressing quality of magnetizing roasting product grade and product of roasting, reduced production cost, reach industrial scale development production, can obtain the iron ore concentrate of grade 55.18%, metal recovery rate reaches 74.6%.
Embodiment
The present invention will be further described for following embodiment:
Embodiment 1: Flos Bombacis Malabarici Feng Ying township, Sichuan spathic iron ore is with FeCO
3For mainly containing ferrous components, its lean ore TFe=27～30%, SiO
2=20～25%, because the low silicon height of iron can't be sintered with blast furnace and directly use.This surface, mine limonite has been accused withered through the exploitation in more than 20 years, its lower floor is the spathic iron ore of 1815.59 ten thousand tons of reserves (wherein 1783.71 ten thousand tons are lean ore).For making full use of local poor iron ore and low-quality coal resources, produce fine iron breeze, its processing step is as follows:
(1) fragmentation-screening: make raw material with low-grade spathic iron ore, after fragmentation-screening, get the roasting lump ore of granularity 30mm;
(2) rotary kiln baking: spathic iron ore is FeCO
3, general beneficiation method is difficult to sort.Can carry out roasting earlier and remove CO
2And upgrade.We carry out modification targetedly with spathic iron ore, are about to FeCO
3Generate Fe by neutral magnetizing roasting
3O
4, product is become have ferromagnetic magnetite, under go on foot magnetic separation and get ready.Make fuel with coal gas, carry out magnetizing roasting at 550 ℃, begin to be fed to discharging, roasting time 60min makes the FeCO in the spathic iron ore
3Be converted into Fe
3O
4, other carbonate also produces certain decomposition, by the control calcination atmosphere, makes the decomposition of spathic iron ore mainly produce Fe
3O
4, CO
2And CO, its reaction product CO also can reduce to the rhombohedral iron ore and the limonite of association; The following formula reaction is mainly pressed in the decomposition of spathic iron ore:
Bubbling air: 3FeCO not
3→ Fe
3O
4+ 2CO
2↑+CO ↑ (1)
Feed little air: 2FeCO
3+ 1/2O
2→ Fe
2O
3+ 2CO
2↑ (2)
3Fe
2O
3+CO→Fe
3O
4+CO
2↑ (3)
By the control calcination atmosphere, the decomposition of spathic iron ore is mainly undertaken by (1) formula.Its reaction product CO also can reduce to the rhombohedral iron ore and the limonite of association.
(3) cooling: temperature still had 450 ℃ when furnace charge was come out of the stove, and adopted below the air-isolation slow cooling to 300 ℃, and this heat energy is used for air and the combustion air that the preheating gas producer is used, shrend chilling again; Can prevent the Fe that generated
3O
4In process of cooling, be oxidized to Fe again
2O
3, also make roasted ore help ball milling-magnetic separation.Its core content is the air-isolation chilling.
(4) ball milling-screening: roasted ore is done magnetic separation-Tuo magnetic-magnetic separation behind ball milling, and magneticstrength 1000 and 800 oersteds get fine iron breeze.The artificial magnet ore deposit is big than natural magnetite remanent magnetism, coercive force is big, and specific susceptibility is little, and therefore the magnetic coagulation phenomenon is serious in ore dressing process, causes the concentrate quality and the rate of recovery all to be lower than natural magnetite.Therefore, must in two stages of magnetic separation, add and take off magnetic technology.
Test-results: on 0.9 * 12 meter test rotary kiln of φ with climb design and research institute of steel mining company ore dressing chamber and carried out beneficiation test, be summarized as follows.
Raw material granularity: 30mm, 550 ℃ of the highest maturing temperatures, the about 60min of roasting time (beginning to be fed to discharging), shrend immediately after the discharging (no slow cooling).Roasted ore is done magnetic separation-Tuo magnetic-magnetic separation behind ball milling, magneticstrength 1000 and 800 oersteds.
The beneficiation test result
| Productive rate/% | TFe/％ | The rate of recovery/% | |
| Concentrate | 52.89 | 55.18 | 74.60 |
| Mine tailing | 47.11 | 21.10 | 25.4 |
| Raw ore | 100 | 39.12 | 100 |
Above test-results shows, handles spathic iron ore through magnetizing roasting-ball milling-magnetic separation-Tuo magnetic-magnetic separation process, can obtain the iron ore concentrate of grade 55.18%, and metal recovery rate reaches 74.6%.
Embodiment 2: Flos Bombacis Malabarici Feng Ying township, Sichuan spathic iron ore is produced fine iron breeze, and its processing step is as follows:
(1) fragmentation-screening: make raw material with low-grade spathic iron ore, after fragmentation-screening, get the roasting lump ore of granularity 40mm;
(2) rotary kiln baking: make fuel with coal gas, carry out magnetizing roasting at 520 ℃, begin to be fed to discharging, the about 50min of roasting time makes the FeCO in the spathic iron ore
3Be converted into Fe
3O
4, other carbonate also produces certain decomposition, by the control calcination atmosphere, makes the decomposition of spathic iron ore mainly produce Fe
3O
4, CO
2And CO, its reaction product CO also can reduce to the rhombohedral iron ore and the limonite of association;
(3) cooling: temperature still had 400 ℃ when furnace charge was come out of the stove, and adopted below the air-isolation slow cooling to 300 ℃, and this heat energy is used for air and the combustion air that the preheating gas producer is used, shrend chilling again;
(4) ball milling-screening: roasted ore is done magnetic separation-Tuo magnetic-magnetic separation behind ball milling, and magneticstrength 1000 and 800 oersteds get fine iron breeze.
Test-results: on 0.9 * 12 meter test rotary kiln of φ with climb design and research institute of steel mining company ore dressing chamber and carried out beneficiation test, be summarized as follows.
Raw material granularity: 40mm, 520 ℃ of the highest maturing temperatures, the about 50min of roasting time (beginning to be fed to discharging), shrend immediately after the discharging (no slow cooling).Roasted ore is done magnetic separation-Tuo magnetic-magnetic separation behind ball milling, magneticstrength 1000 and 800 oersteds.
The beneficiation test result
| Productive rate/% | TFe/％ | The rate of recovery/% | |
| Concentrate | 52.89 | 55.18 | 74.60 |
| Mine tailing | 47.11 | 21.10 | 25.4 |
| Raw ore | 100 | 39.12 | 100 |
Above test-results shows, handles spathic iron ore through magnetizing roasting-ball milling-magnetic separation-Tuo magnetic-magnetic separation process, can obtain the iron ore concentrate of grade 55.18%, and metal recovery rate reaches 74.6%.
Embodiment 3: Flos Bombacis Malabarici Feng Ying township, Sichuan spathic iron ore is produced fine iron breeze, and its processing step is as follows:
(1) fragmentation-screening: make raw material with low-grade spathic iron ore, after fragmentation-screening, get the roasting lump ore of granularity 10mm;
(2) rotary kiln baking: make fuel with coal gas, carry out magnetizing roasting in 600 ℃ of scopes, begin to be fed to discharging, the about 55min of roasting time makes the FeCO in the spathic iron ore
3Be converted into Fe
3O
4, other carbonate also produces certain decomposition, by the control calcination atmosphere, makes the decomposition of spathic iron ore mainly produce Fe
3O
4, CO
2And CO, its reaction product CO also can reduce to the rhombohedral iron ore and the limonite of association;
(3) cooling: temperature still had 500 ℃ when furnace charge was come out of the stove, and adopted below the air-isolation slow cooling to 300 ℃, and this heat energy is used for air and the combustion air that the preheating gas producer is used, shrend chilling again;
(4) ball milling-screening: roasted ore is done magnetic separation-Tuo magnetic-magnetic separation behind ball milling, and magneticstrength 1000 and 800 oersteds get fine iron breeze.
Test-results: on 0.9 * 12 meter test rotary kiln of φ with climb design and research institute of steel mining company ore dressing chamber and carried out beneficiation test, be summarized as follows.
Raw material granularity: 10mm, 600 ℃ of the highest maturing temperatures, the about 55min of roasting time (beginning to be fed to discharging), shrend immediately after the discharging (no slow cooling).Roasted ore is done magnetic separation-Tuo magnetic-magnetic separation behind ball milling, magneticstrength 1000 and 800 oersteds.
The beneficiation test result
| Productive rate/% | TFe/％ | The rate of recovery/% | |
| Concentrate | 52.89 | 55.18 | 74.60 |
| Mine tailing | 47.11 | 21.10 | 25.4 |
| Raw ore | 100 | 39.12 | 100 |
Above test-results shows, handles spathic iron ore through magnetizing roasting-ball milling-magnetic separation-Tuo magnetic-magnetic separation process, can obtain the iron ore concentrate of grade 55.18%, and metal recovery rate reaches 74.6%.
Claims (1)
1, utilize low-grade spathic iron ore to produce the technology of fine iron breeze, it is characterized in that: it may further comprise the steps:
(1) fragmentation-screening: make raw material with low-grade spathic iron ore, after fragmentation-screening, get the roasting lump ore of granularity 10～40mm;
(2) rotary kiln baking: make fuel with coal gas, carry out magnetizing roasting in 520～600 ℃ of scopes, begin to be fed to discharging, the about 50～60min of roasting time makes the FeCO in the spathic iron ore
3Be converted into Fe
3O
4, other carbonate also produces certain decomposition, by the control calcination atmosphere, makes the decomposition of spathic iron ore mainly produce Fe
3O
4, CO
2And CO, its reaction product CO also can reduce to the rhombohedral iron ore and the limonite of association;
(3) cooling: temperature still had 400～500 ℃ when furnace charge was come out of the stove, and adopted below the air-isolation slow cooling to 300 ℃, and this heat energy is used for air and the combustion air that the preheating gas producer is used, shrend chilling again;
(4) ball milling-screening: roasted ore carries out magnetic separation-Tuo magnetic-magnetic separation behind ball milling, and magneticstrength 1000 and 800 oersteds get fine iron breeze.
Priority Applications (1)
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|---|---|---|---|
| CN 200610022654 CN1995411A (en) | 2006-12-26 | 2006-12-26 | Process for producing iron finished ore powder utilizing low grade siderite |
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|---|---|---|---|
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|---|---|---|---|---|
| CN101476031A (en) * | 2009-01-20 | 2009-07-08 | 杨伟 | Method for preparing magnetic attraction iron ore from non-magnetic attraction iron ore |
| CN101914675A (en) * | 2010-08-31 | 2010-12-15 | 马鞍山钢铁股份有限公司 | Method for developing and utilizing spathic iron ore |
| CN101575668B (en) * | 2009-06-19 | 2010-12-29 | 灵宝市金源矿业有限责任公司 | Method for recovering iron in melting waste slag through flash boiling magnetizing roasting |
| CN101274306B (en) * | 2008-05-21 | 2011-03-23 | 昆明理工大学 | Complete flotation mineral separation process for polymetallic siderite |
| CN101413057B (en) * | 2008-03-05 | 2011-03-30 | 中南大学 | Method for efficiently separating low-ore grade and complicated iron ore |
| CN101264465B (en) * | 2008-05-12 | 2011-06-08 | 昆明理工大学 | Singleness siderite full flotation ore dressing method |
| CN101264466B (en) * | 2008-05-12 | 2011-06-08 | 昆明理工大学 | High phosphorus and sulphur siderite full flotation mineral separation method |
| CN102230073A (en) * | 2011-06-14 | 2011-11-02 | 李国三 | Method for producing magnetic iron ore by using limonite |
| CN102274797A (en) * | 2011-08-16 | 2011-12-14 | 鞍钢集团矿业公司 | Sorting process capable of improving sorting indexes of siderite-containing ore |
| CN102586586A (en) * | 2012-03-09 | 2012-07-18 | 中南大学 | Method for magnetizing, roasting and sorting low-grade iron ores |
| CN102925797A (en) * | 2012-11-14 | 2013-02-13 | 曹艺 | Iron concentrate ore sand and sieving process thereof |
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| CN103305650A (en) * | 2013-06-25 | 2013-09-18 | 中南大学 | Efficient comprehensive utilization method of siderite resource |
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| CN105671311A (en) * | 2016-01-21 | 2016-06-15 | 昆明理工大学 | Processing method of iron ore |
| CN105903560A (en) * | 2016-04-13 | 2016-08-31 | 中国地质科学院矿产综合利用研究所 | Deep iron extraction and impurity reduction process for refractory siderite resource |
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| CN106399672A (en) * | 2016-11-22 | 2017-02-15 | 江苏省冶金设计院有限公司 | System and method for treating siderite |
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| CN108504855A (en) * | 2018-05-09 | 2018-09-07 | 东北大学 | A method of producing iron ore concentrate by reducing agent suspending magnetization roasting of siderite |
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2006
- 2006-12-26 CN CN 200610022654 patent/CN1995411A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413057B (en) * | 2008-03-05 | 2011-03-30 | 中南大学 | Method for efficiently separating low-ore grade and complicated iron ore |
| CN101264465B (en) * | 2008-05-12 | 2011-06-08 | 昆明理工大学 | Singleness siderite full flotation ore dressing method |
| CN101264466B (en) * | 2008-05-12 | 2011-06-08 | 昆明理工大学 | High phosphorus and sulphur siderite full flotation mineral separation method |
| CN101274306B (en) * | 2008-05-21 | 2011-03-23 | 昆明理工大学 | Complete flotation mineral separation process for polymetallic siderite |
| CN101476031A (en) * | 2009-01-20 | 2009-07-08 | 杨伟 | Method for preparing magnetic attraction iron ore from non-magnetic attraction iron ore |
| CN101575668B (en) * | 2009-06-19 | 2010-12-29 | 灵宝市金源矿业有限责任公司 | Method for recovering iron in melting waste slag through flash boiling magnetizing roasting |
| CN101914675A (en) * | 2010-08-31 | 2010-12-15 | 马鞍山钢铁股份有限公司 | Method for developing and utilizing spathic iron ore |
| CN102230073A (en) * | 2011-06-14 | 2011-11-02 | 李国三 | Method for producing magnetic iron ore by using limonite |
| CN102274797A (en) * | 2011-08-16 | 2011-12-14 | 鞍钢集团矿业公司 | Sorting process capable of improving sorting indexes of siderite-containing ore |
| CN102586586A (en) * | 2012-03-09 | 2012-07-18 | 中南大学 | Method for magnetizing, roasting and sorting low-grade iron ores |
| CN102586586B (en) * | 2012-03-09 | 2013-04-24 | 中南大学 | Method for magnetizing, roasting and sorting low-grade iron ores |
| CN102925797A (en) * | 2012-11-14 | 2013-02-13 | 曹艺 | Iron concentrate ore sand and sieving process thereof |
| CN102974456A (en) * | 2012-12-11 | 2013-03-20 | 中国地质科学院矿产综合利用研究所 | Separation process of refractory iron ore |
| CN102974456B (en) * | 2012-12-11 | 2015-10-21 | 中国地质科学院矿产综合利用研究所 | Separation process of refractory iron ore |
| CN103305650A (en) * | 2013-06-25 | 2013-09-18 | 中南大学 | Efficient comprehensive utilization method of siderite resource |
| CN103305650B (en) * | 2013-06-25 | 2014-12-24 | 中南大学 | Efficient comprehensive utilization method of siderite resource |
| CN103627891A (en) * | 2013-12-09 | 2014-03-12 | 北京华夏能达科技有限公司 | Method and device for magnetizing-roasting of iron ore |
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| CN104131156B (en) * | 2014-07-28 | 2016-03-30 | 鞍钢集团矿业公司 | Magnetizing roasting-magnetic separation the beneficiation method of fine-grain rhombohedral iron ore |
| CN104451126A (en) * | 2014-12-05 | 2015-03-25 | 中南大学 | Method for intensifying selective decomposition of zinc ferrite |
| CN104498704A (en) * | 2014-12-12 | 2015-04-08 | 陈小众 | Anaerobic reduction roasting method for hydrothermal fluid siderite rotary kiln |
| CN105671311A (en) * | 2016-01-21 | 2016-06-15 | 昆明理工大学 | Processing method of iron ore |
| CN105903560A (en) * | 2016-04-13 | 2016-08-31 | 中国地质科学院矿产综合利用研究所 | Deep iron extraction and impurity reduction process for refractory siderite resource |
| CN106381357A (en) * | 2016-11-22 | 2017-02-08 | 江苏省冶金设计院有限公司 | System and method for treating siderites by using rotary hearth furnace |
| CN106399669A (en) * | 2016-11-22 | 2017-02-15 | 江苏省冶金设计院有限公司 | System and method for treating siderite by combining rotary hearth furnace with ore grinding magnetic separation equipment |
| CN106399672A (en) * | 2016-11-22 | 2017-02-15 | 江苏省冶金设计院有限公司 | System and method for treating siderite |
| CN106399668A (en) * | 2016-11-22 | 2017-02-15 | 江苏省冶金设计院有限公司 | System and method for treating siderite in manner of combining rotary hearth furnace with gas melt separation furnace |
| CN108504855A (en) * | 2018-05-09 | 2018-09-07 | 东北大学 | A method of producing iron ore concentrate by reducing agent suspending magnetization roasting of siderite |
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