CN102417971B - Reduction magnetization beneficiation method of lean hematite - Google Patents
Reduction magnetization beneficiation method of lean hematite Download PDFInfo
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- CN102417971B CN102417971B CN 201110359547 CN201110359547A CN102417971B CN 102417971 B CN102417971 B CN 102417971B CN 201110359547 CN201110359547 CN 201110359547 CN 201110359547 A CN201110359547 A CN 201110359547A CN 102417971 B CN102417971 B CN 102417971B
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Abstract
The invention is a beneficiation method of lean hematite, and especially is physical and chemical combined chemical-industry metallurgical beneficiation technology for reduction magnetization beneficiation of lean hematite with an iron content of not more than 40%. The method adopts peat as a reducing agent, and comprises the following steps: respectively detecting the Fe2O3 content and C content in lean hematite and peat, calculating the material ratio for the reduction reaction of lean hematite and peat, crushing the reaction materials, well mixing, heating to perform a reduction reaction so as to obtain ferromagnetic compounds of Fe3O4 and FeO, and enriching the lean hematite by a magnetic separator to obtain iron concentrate with a Fe content of not less than 65 wt%. The method of the invention reduces nonmagnetic hematite with a chemical structure of Fe2O3 into strongly magnetic Fe3O4 and FeO, and thus enriches iron into iron concentrate by magnetic separation; the reducing agent used in the process is cheap, has good reducing effect, can reduce production cost, and greatly improve the recovery rate.
Description
Technical field
The present invention is a kind of method for concentrating of lean hematite, especially that the lean hematite reduction magnetization of iron content≤40% is selected chemistry and the chemical industry metallurgical technique of preparing of physical bond.
Background technology
The China iron deposit stock number is low, and per capita 25% of the not enough world average level of reserves, and wherein lean ore accounts for 94.3% of total reserves, rich ore only accounts for 5.7%.Hold thin-graded magnetite and account for 68% in the lean ore reserves, the rhombohedral iron ore that is difficult to rich choosing with traditional technology accounts for 32%.To this type of refractory hematite, for a long time all from mineral granularity, dressing method, sort condition and general reduction magnetization aspects has carried out a large amount of experimental studies and industry development, all do not obtain feasible progress.Mainly contain employing coke or CO in these methods as the method for reductive agent, or sneak into the method for certain proportion spathic iron ore roasting reduction.The contriver is through for many years follow, and analyzing the reason that above method makes slow progress in actual applications has two: one, only writes an article from the external physics present situation of mineral, and is not deep into the inherent chemical structure that changes mineral, makes its magnetization selected; The 2nd,, in the magnetization work, or susceptibility is low, or magnetization cost high-technology economic target is poor, can not realize industrialized requirement.
Summary of the invention
Technical problem to be solved by this invention provides the method that a kind of reducing hematite is optional Armco magnetic iron compound, and it can be Fe with chemical structure
2O
3Non magnetic rhombohedral iron ore be reduced to ferromagnetic Fe
3O
4And Fe
0Thereby, be iron ore concentrate with magnetic separation with the iron enrichment.
Solving the method that technical problem of the present invention adopts is: make reductive agent with the cob coal, detect respectively the Fe in lean hematite and the cob coal
2O
3Content and C content calculate the material proportion of lean hematite and cob coal reduction reaction, reaction mass ground, and mixing, reduction reaction is carried out in heating, obtains the magnetic compound Fe of iron
3O
4And Fe
0, its richness is elected as the iron ore concentrate that contains Fe 〉=65wt% with magnetic separator.
The iron content of described lean hematite is 10～40wt%, the quality proportioning of lean hematite and cob coal is ore deposit: coal=1:1.5～2, and reduction reaction temperature is controlled at 300～600 ℃, and the recovery time is 1～3h, after reduction was finished, material cooling and storage were all carried out in the closed unit of secluding air.
The granularity that grinds of lean hematite was 120 mesh sieves 〉=95%, and the granularity that grinds of cob coal was 100 mesh sieves 〉=95%, and the field intensity of magnetic separator magnetic separation is 6000～12000H.
The material that described reduction is good should through cyclone classification, except after abandoning ash, mud scum, carry out magnetic separation with vertical ring wet strong magnetic field magnetic separator.
The present invention program's technical characterstic has following 4 points.
1, the selection of cheap reductive agent, the reason of selecting the cob coal to make reductive agent has three: one, cheap and easy to get, modern age, the people was in Vlei, careless sea and pond, formation of deposits a large amount of cob coals, the annual face territory of digging clearly is wide, number is large, thereby cheap and easy to get; The 2nd, the cob calorific value of coal is low, should not make fuel, and the detritus degree is poor, and also discomfort is made fertilizer, but it contains a certain amount of carbon and abundant volatilizable part, but is good reductive agent, particularly carbon monoxide (CO) and the methane (CH in volatilizable part
4), all be to provide electronics easily and self be oxidized to stablize harmless carbonic acid gas (CO
2) and water (H
2O) desirable reductive agent; The 3rd, this type of gaseous reducing agent can decompose effusion from each part at a certain temperature equably in the mixture of mineral aggregate and cob coal, disperses and plays equably dynamic reductive action, not only makes reaction thoroughly but also do not need the described fluidizing apparatus of prior art.
The cob coal composition analysis of somewhere, Yunnan.
| Composition | Fixed carbon | Fugitive constituent | Ash | Moisture content |
| Content (wt%) | 28.90 | 39.41 | 13.87 | 17.82 |
Somewhere, Yunnan cob coal principal element is analyzed.
| Element | C | H | O | N | S |
| Content (wt%) | 41.43 | 17.14 | 16.95 | 3.64 | 1.16 |
2, the usage quantity of cob coal reductant join control: according to the difference of the contained reductive agent composition of various places cob coal (particularly gaseous state part), the consumption proportion that capable of regulating adapts to.
3, the control of reduction temperature and recovery time: guarantee that volatilizable part of thorough volatilization decomposed and the selection control of the temperature and time that the participation reduction reaction is complete is necessary.
4, the selection of vertical ring wet strong magnetic field magnetic separator: the raw material of this technique and process have more mud part and ash, select such magnetic separator, avoid the mine tailing of annulus (semi-ring) magnetic separator to stop up, and improve the concentrate rate of recovery.
The invention has the beneficial effects as follows.
1, traditional beneficiation method can not rich be selected into the structural change that the lean hematite that contains Fe 10%～40% of stove reduces, can richness elect the iron ore concentrate that contains Fe＞65% as, solve the so far utilization of pendent lean hematite both at home and abroad.
2, effective fit applications of the vertical ring of cob coal---reduction magnetization---wet strong magnetic field magnetic separator has not only reduced production cost, and has greatly improved the rate of recovery, and the general rate of recovery is all greater than 70%, and high person reaches more than 90%.
Embodiment
Example one: the reduction magnetic separation of Malong, Yunnan lean hematite.
One, raw material Main elements analysis.
| Composition | Fe 2O 3 | MnO 2 | Al 2O 3 | SiO 2 | CaO | MgO |
| Content (wt%) | 36.41（Fe25.49） | 7.83 | 11.24 | 29.81 | 9.87 | 6.15 |
Two, main processes.
The mineral powder comminution is thin, and the cob coal is levigate, material compounding, reduction reaction, sealing cooling, wet high-intensity magnetic separation.
Three, technological condition.
1, ore grinding:
(1) dry grinding.
(2) granularity: rhombohedral iron ore-120 order 〉=95%, cob coal-100 order 〉=95%.
2, reduction:
(1) material proportion: ore deposit: coal=1:0.075(mass ratio).
(2) reduction temperature: 450 ± 10 ℃.
(3) recovery time: 1.5h.
3, cooling storing:
(1) sealing cooling.
(2) sealing storing.
4, magnetic separation:
This ore deposit, is adopted lower magnetic field to carry out three grades and is scanned, to improve separating effect for reducing it to the impact of magnetic separation effect owing to the existence of manganese.
(1) once: 6000H.
(2) secondary: 8000H.
(3) three times: 10000H.
Four, the rate of recovery of this example products obtained therefrom quality and ferrous metal.
1, quality product: contain Fe 66.32%.
2, ferrous metal yield: 81.38%.
Example two: Huidong County, Sichuan lean hematite reduction magnetic separation.
One, raw material Main elements analysis.
| Composition | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO |
| Content (wt%) | 43.73（Fe30.61） | 18.41 | 27.22 | 4.92 | 2.23 |
Two, main processes.
The mineral powder comminution is thin, and the cob coal is levigate, material compounding, reduction reaction, sealing cooling, wet magnetic separation.
Three, technological condition.
1, ore grinding:
(1) dry grinding.
(2) granularity: rhombohedral iron ore-120 order 〉=95%, cob coal-100 order 〉=95%.
2, reduction:
(1) material proportion: ore deposit: coal=1:0.08(mass ratio).
(2) reduction temperature: 500 ± 10
0C.
(3) recovery time: 2h.
3, cooling storing:
(1) sealing cooling.
(2) sealing storing.
4, magnetic separation:
Adopt 2 wet strong magnetic field magnetic separation:
(1) once: 8000H.
(2) secondary: 12000H.
Four, this example products obtained therefrom quality and the ferrous metal rate of recovery.
1, quality product: contain Fe 73.12%.
2, ferrous metal yield: 86.24%.
Example three: Yuxi Yang Wu lean hematite reduction magnetic separation.
One, raw material Main elements analysis.
| Composition | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO |
| Content (wt%) | 37.69（Fe26.38） | 20.18 | 31.38 | 5.33 | 2.81 |
Two, main processes.
The mineral powder comminution is thin, and the cob coal is levigate, material compounding, reduction reaction, sealing cooling, wet magnetic separation.
Three, technological condition.
1, ore grinding:
(1) dry grinding.
(2) granularity: rhombohedral iron ore-120 order 〉=95%, cob coal-100 order 〉=95%.
2, reduction:
(1) material proportion: ore deposit: coal=1:0.08(mass ratio).
(2) reduction temperature: 480 ± 10
0C.
(3) recovery time: 2h.
3, cooling storing:
(1) sealing cooling.
(2) sealing storing.
4, magnetic separation:
Adopt 2 wet strong magnetic field magnetic separation:
(1) once: 8000H.
(2) secondary: 12000H.
Four, this example products obtained therefrom quality and the ferrous metal rate of recovery.
1, quality product: contain Fe 70.31%.
2, ferrous metal yield: 83.11%.
Claims (3)
1. the reduction magnetization beneficiation method of a lean hematite is characterized in that: make reductive agent with the cob coal, detect respectively the Fe in lean hematite and the cob coal
2O
3Content and C content calculate the material proportion of lean hematite and cob coal reduction reaction, reaction mass ground, and mixing, reduction reaction is carried out in heating, obtains the magnetic compound Fe of iron
3O
4And FeO, its richness is elected as the iron ore concentrate that contains Fe 〉=65wt% with magnetic separator, the iron content of lean hematite is 10～40wt%, the quality proportioning of lean hematite and cob coal is ore deposit: coal=1:1.5～2, reduction reaction temperature is controlled at 300～600 ℃, recovery time is 1～3h, and after reduction was finished, material cooling and storage were all carried out in the closed unit of secluding air.
2. the reduction magnetization beneficiation method of lean hematite according to claim 1, it is characterized in that: the granularity that grinds of lean hematite was 120 mesh sieves 〉=95%, the granularity that grinds of cob coal was 100 mesh sieves 〉=95%, and the field intensity of magnetic separator magnetic separation is 6000～12000H.
3. the reduction magnetization beneficiation method of lean hematite according to claim 2 is characterized in that: the material that reduction is good should through cyclone classification, except after abandoning ash, mud scum, carry out magnetic separation with the vertical wet strong magnetic field magnetic separator that encircles.
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|---|---|---|---|
| CN 201110359547 CN102417971B (en) | 2011-11-15 | 2011-11-15 | Reduction magnetization beneficiation method of lean hematite |
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|---|---|---|---|
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| CN102417971B true CN102417971B (en) | 2013-04-10 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676620A (en) * | 2005-04-22 | 2005-10-05 | 纪礽辉 | Ore dressing process for reducing magnetic iron ore from hematite carbonaceous pelletizing |
| CN1861265A (en) * | 2005-04-22 | 2006-11-15 | 纪礽辉 | Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite |
| CN101240371A (en) * | 2008-03-14 | 2008-08-13 | 东北大学 | Method for extracting iron from poor mixed hematite |
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- 2011-11-15 CN CN 201110359547 patent/CN102417971B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676620A (en) * | 2005-04-22 | 2005-10-05 | 纪礽辉 | Ore dressing process for reducing magnetic iron ore from hematite carbonaceous pelletizing |
| CN1861265A (en) * | 2005-04-22 | 2006-11-15 | 纪礽辉 | Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite |
| CN101240371A (en) * | 2008-03-14 | 2008-08-13 | 东北大学 | Method for extracting iron from poor mixed hematite |
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