CN101104881A - Iron ore roasting technique - Google Patents
Iron ore roasting technique Download PDFInfo
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- CN101104881A CN101104881A CNA2007100924279A CN200710092427A CN101104881A CN 101104881 A CN101104881 A CN 101104881A CN A2007100924279 A CNA2007100924279 A CN A2007100924279A CN 200710092427 A CN200710092427 A CN 200710092427A CN 101104881 A CN101104881 A CN 101104881A
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Abstract
The invention discloses an iron ore calcinations process, which comprises (1) detecting and regulating the weight proportions of siderite (FeCO3) and hematite (Fe2O3) in the iron ore, if the content of siderite (FeCO3) in the iron ore is low, the siderite (FeCO3) is added to allow the weight ratio of siderite to hematite is larger than or equal to 0.725; (2) crushing iron ore or a mixture of iron ore and siderite, sieving, and collecting ore particles with a grain size of 10-75mm; and (3) calcining at a temperature ranging from 720 DEG C to 900 DEG C under a negative pressure larger than 100mm water column. The inventive iron ore calcinations process has the advantages that the magnetic roasting of siderite is completed in a neutral atmosphere without using reducers and the CO gas with reducing capacity is released and serves as a reducer for the magnetic roasting of hematite; and the procedure of adding reducer is omitted, so that the consumption of reducer such as powdered coal is reduced and the calcinations cost is saved. The invention can better utilize the siderite (limonite)-siderite mixed iron ore, provide a basis for developing the iron ore in Qijiang technically and theoretically.
Description
Technical field
The present invention relates to a kind of process method for roasting of iron ore, the process method for roasting of especially red (brown) iron ore-spathic iron ore mixed type iron ore.
Background technology
Domestic in the Qijiang County, Chongqing City, storing a kind of red (brown) iron ore-spathic iron ore mixed type iron ore (this paper is referred to as the Qijiang iron ore), once supplied with Chongqing iron and steel (collective) company limited and used.The Qijiang iron ore belongs to acid high silicon low-sulfur phosphorus-containing iron ore, and the ore natural type is red (brown) iron ore-spathic iron ore mixed type ore; With the occurrence status complexity of its iron in ore, the multi mineral symbiosis, the ore deposit disseminated grain size very carefully is difficult to monomer dissociation and iron ore concentrate dehydration characteristics such as difficulty and well-known less.For developing this partly resource, heavy steel is once in sixties first arrival late nineteen seventies, surplus the cumulative investment test funds 100 ten thousand yuan, successively entrust metallurgical mine research institute of number man, carry out magnetic, weight, the experimental study of flotation ore deposit, and throw footrill sink float separation factory of factory and numb willow beach Sweet natural gas calcining magnetic separation factory in the construction of Qijiang iron ore in succession, but all because of the ore complex structure, difficult tribulation choosing difficulty is dewatered and is forced to stop factory, inactive.Qijiang iron ore character is mainly: one, mineral composition complexity, multi mineral symbiosis.Fresh grey black～aterrimuss that show under naked eyes of ore have the compact mass structure more, and part is the assorted columnar structure of ribbon, beans shape, dust shape, sparse dip-dye shape or spot.Observation under mirror, X-ray diffraction analysis and scanning electron microscope analysis, the iron in ore mineral species is more, except that spathic iron ore, secondly is rhombohedral iron ore, and other has a small amount of magnetite, half martite and limonite.Metallic sulfide content is extremely low, and rarely seen pyrite sporadicly distributes.Secondly gangue mineral is penninite, chamosite, illite and phosphatic rock based on quartz.Other trace quantity mineral comprises calcite, rhombspar, plagioclase, biotite, white mica, zircon, rutile and pistacite.Two, disseminated grain size is very carefully few, is difficult to monomer dissociation.Two, 1, rhombohedral iron ore and limonite: rhombohedral iron ore and limonite are distributed more widely general, and the output form is comparatively complicated, summarizes and gets up to be broadly divided into two kinds of forms.1. be beans shape aggregate and occur, internal crack is common, and the minority aggregate has biological structure.Higher in the segment set zoarium because of the shale component content, the visible limonite explanation along the edge, granularity 0.3～1.0mm does not wait.2. be irregular or fine pulse-like along the filling of quartzy chip intergranular, constitute very complicated intergrowth relation, also can be used as cementing matter simultaneously and distribute along beans shape magnetite or beans shape rhombohedral iron ore aggregate intergranular.Change of granularity is bigger, and thick person can be to 0.3mm, and tiny person is only about 0.01mm, general 0.02～0.2mm.In the rhombohedral iron ore of above-mentioned two kinds of output forms, quantitatively based on first kind, the two mineral content ratio is roughly 65: 35.Adhere to the product of different origins separately, the former is formed through martite by beans shape magnetite, and its embedding Bu Tezheng is comparatively simple.The latter is then relevant with hydrothermal metasomatism or weathering eluviation.Since complicated with gangue mineral intergrowth relation, even also being difficult to acquisition, the rhombohedral iron ore fine grinding of a kind of form in back fully dissociates.Two, 2, spathic iron ore: spathic iron ore often is idiomorphism, hypidiomorphic granular.Colour-change is bigger, based on tawny, is sorrel, yellow-green colour and chocolate secondly.Be divided into primary and secondary two kinds, the former often is microfine and middle particulate output.Wherein the microfine spathic iron ore mainly occurs with the form of matrix, general 0.005～the 0.04mm of grain size number, aggregate coarse size person is greater than 1.0mm, tiny person is less than 0.05mm, and general 0.1～0.5mm is at the quartzy chip of normal extensively distribution angular of microfine spathic iron ore intergranular or subangular, wherein quartzy chip granularity thickness is inhomogeneous, tiny person is less than 0.01mm, general 0.02～0.05mm, and individual coarse person is greater than 0.3mm.Local quartz mine is considered comparatively enrichment to be worth doing, even to the ferruginous sandstone transition, the many forms with cementing matter of spathic iron ore this moment exist, or are the inhomogeneous embedding cloth of the shape that is scattered about like the stars.The common crystallization degree of secondary spathic iron ore is higher, and granularity is thicker, is irregular lumps or fine pulse-like along ore hole and fracture filling explanation microfine or middle particulate spathic iron ore more.Part microfine spathic iron ore is spherulitic or roe shape aggregate occurs, and roe nuclear often is made up of tiny flakey chlorite and the quartzy chip of microfine, even fine grinding also is difficult to it is dissociated.Two, 3, gangue mineral: mainly being quartzy, is chlorite, illite and phosphatic rock secondly.Wherein quartzy widely distributed, often be fragmental and be wrapped in part beans shape magnetite and the rhombohedral iron ore, part then is fragmental and spathic iron ore intergrowth, and globule size differs, and tiny person is less than 0.01mm, and general 0.02～0.1mm individually can be to the 0.3mm.Chlorite often is finely squamose, aggregate is irregular, how to be wrapped in spathic iron ore inside along the filling of spathic iron ore intergranular or as roe nuclear, local comparatively enrichment and become the embedding cloth substrate of spathic iron ore, the aggregate change of granularity is bigger, little person is less than 0.02mm, general 0.05～0.5mm, and part can be to the 1.0mm.Phosphatic rock is widely distributed, often is the tiny granular spathic iron ore intergranular that sees and distributes, and granularity between 0.002～0.05mm, is seldom seen the thicker person of granularity mostly, and characteristic distributions one is that granularity is tiny; The 2nd, very close with the relation of spathic iron ore, even adopt fine grinding technology also to be difficult to it is dissociated.Three, the moisture height of filter cake, the iron ore concentrate dehydration is difficult.Qijiang iron ore fiber crops willow beach Sweet natural gas calcining magnetic separation factory adopts permanent magnetism vacuum outside filtering type filter between the seventies trial production period, iron ore concentrate filter cake moisture content average out to 18% is up to 21.30%, because iron ore concentrate filter cake moisture content height, production is difficult to normally carry out.Once invited Ministry of Metallurgical Industry dehydration expert to come the tackling key problem of ore deposit organizational technology, but because iron ore concentrate exists pore water and magnetic coagulation parcel water, and very easily forming fouling, to stop up filter cloth pore etc. former thereby have no resolution.
The Qijiang iron ore is because of above characteristics, adopts the prior art can't calcination process, can not get exploitation for a long time and uses, and makes valuable natural resources idle, resources advantage can not be converted into economic advantages.Simultaneously, Chongqing iron and steel (collective) company limited needs a large amount of iron ores again, and the money of the number that need cost a lot of money every year is bought nonlocal iron ore, and the freight charges of cost writing are transported nonlocal iron ore back plant area again.
Summary of the invention
The present invention is directed to prior art can't handle the Qijiang iron ore roasting, the Qijiang iron ore can not get the deficiency of exploiting and using for a long time, a kind of calcination process method is provided, can effectively carry out calcination process, qualified, the high-quality roasted ore that provide that Steel Plant use to red (brown) iron ore-spathic iron ore mixed type iron ore.
Calcination process method of the present invention: a kind of iron ore roasting technique, step is: spathic iron ore FeCO in (1), detection, the adjustment iron ore
3With rhombohedral iron ore Fe
2O
3Weight ratio, if iron ore in spathic iron ore FeCO
3Content is low, then adds spathic iron ore FeCO
3, make spathic iron ore and rhombohedral iron ore weight ratio more than or equal to 0.725; (2), with the mixed ore fragmentation of iron ore or iron ore and spathic iron ore, sieve, choose the ore of granularity at 10-75mm; (3), 720 ℃ to 900 ℃ following roastings, the roasting negative pressure is greater than the 100mm water column.
Spathic iron ore and rhombohedral iron ore weight ratio are greater than 1.
Iron ore roasting technique of the present invention with respect to prior art, has following characteristics:
1, the spathic iron ore magnetizing roasting need not additional reducing agent, just can realize under the neutral atmosphere condition, and emit the reductive agent of reducing gas CO as the rhombohedral iron ore magnetizing roasting.Do not need additional reducing agent, under neutral atmosphere, just can realize spathic iron ore and rhombohedral iron ore magnetizing roasting; Omit the operation of additional reducing agent, saved reductive agent, the consumption as coal dust etc. has reduced the roasting cost.
2, can utilize red (brown) iron ore-spathic iron ore mixed type iron ore well, technically, provide foundation for exploitation Qijiang iron ore in theory.
3, roasting effect is good, steady quality is provided, meets the roasted ore of ironmaking needs.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing
Differential thermal-thermogravimetric (TGA-DTA) curve of Fig. 1 raw ore in neutral closed atmosphere (nitrogen environment).
Fig. 2 ore roasting test flow process
Fig. 3 Qijiang formula iron ore roasting commerical test flow process
Embodiment
Calcination process method of the present invention is: a kind of iron ore roasting technique is characterized in that comprising the steps: (1), detects, adjusts spathic iron ore FeCO in the iron ore
3With rhombohedral iron ore Fe
2O
3Weight ratio, if iron ore in spathic iron ore FeCO
3Content is low, then adds spathic iron ore FeCO
3, make spathic iron ore and rhombohedral iron ore weight ratio more than or equal to 0.725; (2), with the mixed ore fragmentation of iron ore or iron ore and spathic iron ore, sieve, choose the ore of granularity at 10-75mm; (3), 720 ℃ to 900 ℃ following roastings, the roasting negative pressure is greater than the 100mm water column;
Spathic iron ore and rhombohedral iron ore weight ratio are greater than 1.
Technical basis of the present invention, 1. differential thermal analysis:
As shown in Figure 1, record differential thermal-thermogravimetric (TGA-DTA) curve of raw ore in neutral closed atmosphere (nitrogen environment) for differential thermal-thermogravimetric instrument Netzsch.
The result shows: along with the rising of temperature, curve A BC segment table shows limonite heat absorption, dehydration decomposition, and weight begins to alleviate, and its chemical equation is as follows:
2Fe
2O
3·3H
2O＝2Fe
2O
3+3H
2O-Q
1
Curve D EF segment table shows the spathic iron ore thermal endothermic decomposition, generates FeO, and FeO character is quite active, and instability is decomposed the CO that produces by self
2Oxidation generates strongly magnetic mineral Fe fast
3O
4, separate out CO, CO
2Mixed gas, ore weightlessness, a large amount of heat is emitted in the FeO oxidation, and reaction equation is as follows:
FeCO
3＝FeO+CO
2-Q
2
3FeO+CO
2＝Fe
3O
4+CO+Q
3
Total reaction equation: 3FeCO
3=Fe
3O
4+ CO+2CO
2-Q
4
Curve FGH segment table shows that rhombohedral iron ore is generated strongly magnetic mineral-Fe by the CO reduction
3O
4, chemical equation is as follows:
3Fe
2O
3+CO＝2Fe
3O
4+CO
2-Q
5
The two total reaction equation: FeCO
3+ Fe
2O
3=Fe
3O
4+ CO
2-Q
6
2. reaction mechanism
By process mineralogy research as can be known: this sample ore is rhombohedral iron ore-spathic iron ore mixed type ore.Under neutral atmosphere (not additional reducing agent, such as coal dust) condition, spathic iron ore magnetizing roasting chemical equation is: FeCO
3→ FeO+CO
2
3FeO+CO
2→Fe
3O
4+CO
Its net reaction is 3FeCO
3→ Fe
3O
4+ 2CO
2+ CO
And rhombohedral iron ore magnetizing roasting chemical equation is:
3Fe
2O
3+CO→2Fe
3O
4+CO
2
The two total reaction equation is: FeCO
3+ Fe
2O
3→ Fe
3O
4+ CO
2
By above reaction formula as can be known: the rhombohedral iron ore magnetizing roasting must have reductive agent, and the spathic iron ore magnetizing roasting need not additional reducing agent, just can realize under the neutral atmosphere condition, and emit the reductive agent of reducing gas CO as the rhombohedral iron ore magnetizing roasting.Analyze theoretically, the ratio of the substance weight of spathic iron ore and rhombohedral iron ore is more than or equal to 1, if promptly weight ratio reach 0.725 and more than, just this ore can be realized carrying out smoothly of neutral magnetizing roasting, and actual ore spathic iron ore and rhombohedral iron ore weight ratio are 1.27, greater than 0.725.
Fig. 2 is an ore roasting test flow process.
Embodiment 1, adjusts spathic iron ore and rhombohedral iron ore weight ratio, and greater than 1 mixed, actual ratio is about 1.1 according to spathic iron ore and rhombohedral iron ore weight ratio; Take by weighing-2mm ore 1.2kg, the metal vessel of packing into treats to put into when resistance furnace temperature is raised to design temperature roaster hearth, after furnace temperature is raised to design temperature, write down roasting time again, carry out magnetizing roasting, behind setting-up time, take out container and rapidly with the water seal cooling, roasted ore carries out ore grinding (fineness-0.043mm98.54%) by 50% concentration again after cooling, divide sample, get about 20g sample and do the test of magnetic separation pipe, the content of ferromagnetism iron mineral in the check roasted ore is to detect the quality of roasted ore.
It is as follows to obtain test index:
Test index table (%) table 1
| Temperature (℃) | Time (min) | Name of product | Productive rate | TFe | The rate of recovery |
| 838 | 120 | Magnetic concentrate | 79.71 | 60.07 | 92.53 |
| Magnetic tailing | 20.29 | 19.06 | 7.47 | ||
| Roasted ore | 100.00 | 51.75 | 100.00 |
Conclusion (of pressure testing): it is practicable that this ore adopts this process method for roasting.Under the neutral atmosphere condition, 838 ℃ of control maturing temperatures, roasting time 90min, water-cooled is come out of the stove, and can obtain comparison fine roasted ore.
(2), the test type of furnace and operational condition
The test type of furnace is the Qijiang iron ore Qijiang formula stoving oven of research and design voluntarily, its test operation condition is: 1070 ℃ of chamber temperatures, 806 ℃ of heating zone temperature, 425 ℃ of preheating zone temperature, the roasting negative pressure is greater than 100mm water column (the combustion chamber internal cause exhausting of stoving oven and produce negative pressure).
(3), test period
Test period totally 5 days was wherein adjusted the stoving oven operational condition 2 days, continous-stable test 3 days.
(4), sampling analysis system
Be the representativeness of sample in the warranty test process, sampling interval time be sampling in 1 hour once, per tour sampling is merged into an assay sample 8 times.
(5), experiment process
Bai Shitan sample that gather in the mining area is transported to footrill roasting workshop, in footrill mining area sample: the ratio of Bai Shitan mining area well sample=2: 1, its spathic iron ore and rhombohedral iron ore weight ratio are greater than 1 after testing; Method with hand feeding feeds the crushing and screening system, reaches qualified grade and goes into the stove roasting, and experiment process is seen shown in Figure 3, referring to Fig. 3.
(6), test-results
1. treatment capacity and roasted ore output during platform
7.65 tons/platform of treatment capacity during platform. the time, 5.98 tons/platform of roasted ore output. the time.
2. coal consumption: 16 tons in continous-stable duration of test consumption bituminous coal, produce 430.11 tons of roasted ores, coal consumption 37Kg/ ton roasted ore.
3. power consumption: continous-stable duration of test power consumption 3720Kw.h, produce 430.11 tons of roasted ores, power consumption 8.65Kw.h/ ton roasted ore.
4. test index: go into stove ore deposit grade 41.08%, burn and lose 21.83%, roasted ore grade 51.42%.Roasted ore under the grinding fineness-200 purpose condition, sorts iron concentrate grade 56.44%, concentrate yield 51.80%, metal recovery rate 56.86% at magneticstrength 1200 oersteds through the magnetic separation pipe.
From the foregoing description as can be known:
(1), testing laboratory's small-scale test and commerical test all show: it is practicable that Qijiang formula iron ore adopts sinter process.Under the neutral atmosphere condition, 820 ℃ of control maturing temperatures discharge out of the furnace after water-cooled, can obtain comparison fine roasted ore.
(2), the laboratory test index is: go into stove ore deposit grade 40.39%, burn and lose 18.96%, roasted ore grade 51.75%.
(3), the type approval test index is: go into stove ore deposit grade 41.08%, burn and lose 21.83%, roasted ore grade 51.42%.
(4), according to the occurrence status complexity of iron in the Qijiang formula iron ore, the multi mineral symbiosis, the ore deposit disseminated grain size very carefully is difficult to characteristics such as monomer dissociation and iron ore concentrate dehydration difficulty less, adopt sinter process to obtain the roasted ore of iron grade＞50%, for weighing stock company of steel group iron work, being feasible technically, is a kind of efficient ways of handling Qijiang formula refractory iron ore.
The mixed ore fragmentation of spathic iron ore and rhombohedral iron ore, sieve etc., concrete processing parameter is all arranged, the processing parameter of dissimilar, big or small stoving oven is variant.To the iron ore fragmentation, sieve etc. as prior art, do not describe in detail at this.
Claims (2)
1. an iron ore roasting technique is characterized in that comprising the steps: (1), detects, adjusts spathic iron ore FeCO in the iron ore
3With rhombohedral iron ore Fe
2O
3Weight ratio, if iron ore in spathic iron ore FeCO
3Content is low, then adds spathic iron ore FeCO
3, make spathic iron ore and rhombohedral iron ore weight ratio more than or equal to 0.725; (2), with the mixed ore fragmentation of iron ore or iron ore and spathic iron ore, sieve, choose the ore of granularity at 10-75mm; (3), 720 ℃ to 900 ℃ following roastings, the roasting negative pressure is greater than the 100mm water column.
2. iron ore roasting technique according to claim 1 is characterized in that: spathic iron ore and rhombohedral iron ore weight ratio are greater than 1.
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|---|---|---|---|
| CNB2007100924279A CN100494421C (en) | 2007-07-13 | 2007-07-13 | Iron ore baking technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100924279A CN100494421C (en) | 2007-07-13 | 2007-07-13 | Iron ore baking technique |
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|---|---|
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| CN100494421C CN100494421C (en) | 2009-06-03 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476031A (en) * | 2009-01-20 | 2009-07-08 | 杨伟 | Method for preparing magnetic attraction iron ore from non-magnetic attraction iron ore |
| WO2012150873A1 (en) * | 2011-05-05 | 2012-11-08 | Erlikhman Dmitriy Leonidovich | Method for pollution-free processing of sideritic iron ore |
| CN104451126A (en) * | 2014-12-05 | 2015-03-25 | 中南大学 | Method for intensifying selective decomposition of zinc ferrite |
| CN104673994A (en) * | 2014-04-30 | 2015-06-03 | 内蒙古科技大学 | Ore dressing method for roasting magnetized weakly-magnetic iron ores under external-reducer-free conditions |
| CN108330273A (en) * | 2018-05-07 | 2018-07-27 | 段志松 | A kind of iron ore roasting Magnitizing method and equipment |
| CN112176176A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Method for improving reducibility of natural lump ore |
| CN112176178A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Method for improving thermal decrepitation of natural block ore |
| CN112176177A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Pretreatment method of natural lump ore |
| CN112593152A (en) * | 2020-11-26 | 2021-04-02 | 安徽金阳金属结构工程有限公司 | High-strength H-shaped steel for fabricated building and production process thereof |
-
2007
- 2007-07-13 CN CNB2007100924279A patent/CN100494421C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476031A (en) * | 2009-01-20 | 2009-07-08 | 杨伟 | Method for preparing magnetic attraction iron ore from non-magnetic attraction iron ore |
| WO2012150873A1 (en) * | 2011-05-05 | 2012-11-08 | Erlikhman Dmitriy Leonidovich | Method for pollution-free processing of sideritic iron ore |
| RU2562016C1 (en) * | 2011-05-05 | 2015-09-10 | Дмитрий Леонидович Эрлихман | Method of preparation to processing of sideritic iron ore (versions) and method of its following waste-free processing |
| CN104673994A (en) * | 2014-04-30 | 2015-06-03 | 内蒙古科技大学 | Ore dressing method for roasting magnetized weakly-magnetic iron ores under external-reducer-free conditions |
| CN104451126A (en) * | 2014-12-05 | 2015-03-25 | 中南大学 | Method for intensifying selective decomposition of zinc ferrite |
| CN108330273A (en) * | 2018-05-07 | 2018-07-27 | 段志松 | A kind of iron ore roasting Magnitizing method and equipment |
| CN112176176A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Method for improving reducibility of natural lump ore |
| CN112176178A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Method for improving thermal decrepitation of natural block ore |
| CN112176177A (en) * | 2019-07-04 | 2021-01-05 | 美匡冶金技术研究院(苏州)有限公司 | Pretreatment method of natural lump ore |
| CN112593152A (en) * | 2020-11-26 | 2021-04-02 | 安徽金阳金属结构工程有限公司 | High-strength H-shaped steel for fabricated building and production process thereof |
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|---|---|
| CN100494421C (en) | 2009-06-03 |
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