CN102417970B - Method for reducing, magnetizing and concentrating iron tailings - Google Patents
Method for reducing, magnetizing and concentrating iron tailings Download PDFInfo
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- CN102417970B CN102417970B CN 201110359545 CN201110359545A CN102417970B CN 102417970 B CN102417970 B CN 102417970B CN 201110359545 CN201110359545 CN 201110359545 CN 201110359545 A CN201110359545 A CN 201110359545A CN 102417970 B CN102417970 B CN 102417970B
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Abstract
The invention relates to a chemical and physical combined chemical metallurgical ore dressing technology for concentrating reduced and magnetized Fe2O3-containing iron tailings into rich concentrate. In the method, the iron tailings are used as a raw material, turf peat is used as a reducing agent, fluorite is used as a dispersant, and limestone is used as an oxygen regulating agent. The method comprises the following steps of: proportioning and uniformly mixing reaction materials according to the detection content, performing reduction reaction by heating to obtain magnetic compounds Fe3O4 and FeO of iron, cooling and storing the reduced materials in a closed state of isolated air, and performing magnetic separation to obtain iron concentrate containing more than or equal to 65 percent of iron (Fe). By the method, fine silt-like nonmagnetic hematite with the chemical structure of Fe2O3 can be reduced into magnetic Fe3O4 and FeO, and iron is enriched into the iron concentrate by magnetic separation; and the method is easy to implement, reasonable in use of the reducing agent, good in dynamic reducing effect and low in production cost.
Description
Technical field
The present invention a kind ofly will contain Fe
2O
3The iron tailings reduction magnetization after selected be the chemistry of rich concentrate 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%.In the selected enrichment of lean ore, be no matter to the selected of magnetite or selected to limonite, rhombohedral iron ore, spathic iron ore, be left behind the huge iron tailings of quantity, so far can't the enrichment utilization.Be not only the waste to iron resources, and be the pollution to environment.Although the reduction scheme of a lot of low-grade iron ores is arranged in prior art, because the reductive agent cost that uses is higher, and the stirring action that dynamically seethes with excitement is poor, causes production cost higher, therefore can not be promoted.
Summary of the invention
A kind of method that it is optional Armco magnetic iron compound that technical problem to be solved by this invention is to provide reduced iron mine tailing, it can be Fe with thin mud shape chemical structure
2O
3Non magnetic rhombohedral iron ore be reduced to the Fe of magnetic
3O
4And Fe
0Thereby, be iron ore concentrate with magnetic separation with the iron enrichment, the method operation is simple and easy, and reductive agent uses rationally, and dynamically reduction effect is good, and production cost is lower.
Solving the scheme that technical problem of the present invention adopts is: take iron tailings as raw material, make reductive agent with the cob coal, take fluorite as dispersion agent, the lime masonry is transferred the oxygen agent, prepares burden by the detection level of each reaction mass, and mixing, reduction reaction is carried out in heating, obtains the magnetic compound Fe of iron
3O
4And Fe
0, in air-tight state cooling and storing to the material that reduces of isolated air, then magnetic separation is the iron ore concentrate of iron content Fe 〉=65%.
The iron content of described iron tailings is 10～40wt%, the mass ratio of each material of reduction reaction is, iron tailings: cob coal: fluorite: Wingdale=1:0.05～0.1:0.001～0.005:0.005～0.01,300～600 ℃ of reduction reaction temperatures, the recovery time is 1～3h.
Iron tailings should be 120 mesh sieves 〉=95wt% through delaying wash-out mud and being milled to granularity, it was 120 mesh sieves 〉=95 wt % that fluorite and lime are milled to granularity, it was 100 mesh sieves 〉=95 wt % that the cob coal is milled to granularity, and the reaction mass briquetting that should be mixed is Φ 30mm～Φ 50mm before reduction reaction.
The material that reduction is good should except after abandoning ash content, mud scum, adopt the vertical ring of wet type high intensity magnetic separator to carry out magnetic separation through cyclone classification, and field intensity is 6000～12000H.
The invention has the beneficial effects as follows: 1. select cob coal cheap and easy to get to make reductive agent, integrate traditional gas base and coal-based reduction advantage, except contained fixed carbon wherein rises reductive action, its abundant gaseous reduction composition can play preferably dynamically reduction effect, the contained volatile matter of cob coal from ore deposit mixed each aspect that touches minute effusion, not only contact is abundant, and plays dynamic boiling stirring action.2. select fluorite and Wingdale as dispersion agent and transfer the oxygen agent, the particulate mineral aggregate is fully reduced.3. the Reasonable control of the consumption of reducing material makes the red iron tailings reduction of particulate more thorough.4. select vertical ring wet strong magnetic field magnetic separator to carry out magnetic separation to the material that reduces, be convenient to more mud is divided with ash content and get rid of smoothly, avoid the mine tailing of annulus (semi-ring) magnetic separator to stop up, effectively improve concentrate grade and the rate of recovery.
The iron tailings magnetization that present method will be discarded in a large number is selected is iron ore concentrate, not only improved environment, and reclaimed and abandoned long-pending iron resources, and to the iron import big country of our so poor iron, the outstanding great economic benefit of tool and social benefit.
Embodiment
Example one: Yunnan Yuxi Yang Wu iron tailings.
One, raw material Main elements analysis.
| Composition | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO |
| Content (%) | 39.84 | 12.18 | 30.11 | 10.72 | 8.91 |
Two, main processes.
Mine tailing delays wash-out mud, levigate, prepares burden levigate, and material compounding, briquetting, reduction reaction is sealed cold storage, wet magnetic separation.
Three, technological condition.
1. raw meal particle size: ore deposit and batching :-120 orders 〉=95%, coal :-100 orders 〉=95%.
2. material proportion: ore deposit: coal: fluorite: Wingdale=1:0.08:0.002:0.006.
3. reductive condition: a φ 50mm, 480 ℃ ± 10 ℃ of temperature, time 1h.
4. cooling storing: seal cooling, sealing storing.
5. two-stage magnetic separation a: 8000H; Secondary 10000H.
Four, products obtained therefrom quality and the ferrous metal rate of recovery.
1. quality product: contain Fe 68.33%.
2. the ferrous metal rate of recovery: 80.21%.
Example two: Huidong County, Sichuan iron tailings.
One, raw material Main elements analysis.
| Composition | Fe 2O 3 | Al 2O 3 | SiO 2 | CaO | MgO |
| Content (%) | 42.33 | 10.08 | 34.22 | 8.61 | 9.31 |
Two, main processes.
Mine tailing delays wash-out mud, levigate, prepares burden levigate, and material compounding, briquetting, reduction reaction is sealed cold storage, wet magnetic separation.
Three, technological condition.
1. raw meal particle size: ore deposit and batching :-120 orders 〉=95%, coal :-100 orders 〉=95%.
2. material proportion: ore deposit: coal: fluorite: Wingdale=1:0.09:0.003:0.006.
3. reductive condition: a φ 50mm, 450 ℃ ± 10 ℃ of temperature, time 1.5h.
4. cooling storing: seal cooling, sealing storing.
5. two-stage magnetic separation a: 8000H; Secondary 12000H.
Four, products obtained therefrom quality and the ferrous metal rate of recovery.
1. quality product: contain Fe 70.12%.
2. the ferrous metal rate of recovery: 81.34%.
Example three: Malong, Yunnan iron tailings.
One, raw material Main elements analysis.
| Composition | Fe 2O 3 | MnO 2 | SiO 2 | CaO | Mg |
| Content (%) | 29.33 | 11.26 | 31.32 | 8.86 | 7.38 |
Two, main processes.
Mine tailing delays wash-out mud, levigate, levigate, the material compounding of preparing burden, briquetting, and reduction reaction is sealed cold storage, wet magnetic separation.
Three, technological condition.
1. raw meal particle size: ore deposit and batching :-120 orders 〉=95%, coal :-100 orders 〉=95%.
2. material proportion: ore deposit: coal: fluorite: Wingdale=1:0.075:0.003:0.008.
3. reductive condition: a φ 50mm, 500 ℃ ± 10 ℃ of temperature, time 2h.
4. cooling storing: seal cooling, sealing storing.
5. three grades of magnetic separation a: 6000H; Secondary 8000H; Three 12000H.
Four, products obtained therefrom quality and the ferrous metal rate of recovery.
1. quality product: contain Fe 66.12%.
2. the ferrous metal rate of recovery: 78.23%.
Claims (3)
1. the reduction magnetization beneficiation method of an iron tailings, it is characterized in that: iron tailings is raw material, makes reductive agent with the cob coal, take fluorite as dispersion agent, the lime masonry is transferred the oxygen agent, prepares burden by the detection level of each reaction mass, mixing, reduction reaction is carried out in heating, obtains the magnetic compound Fe of iron
3O
4And FeO, air-tight state cooling and storing to the material that reduces at isolated air, magnetic separation is the iron ore concentrate of iron content Fe 〉=65% again, the iron content of iron tailings is 10～40wt%, the mass ratio of each material of reduction reaction is, iron tailings: cob coal: fluorite: Wingdale=1:0.05～0.1:0.001～0.005:0.005～0.01,300～600 ℃ of reduction reaction temperatures, the recovery time is 1～3h.
2. press the reduction magnetization beneficiation method of iron tailings claimed in claim 1, it is characterized in that: iron tailings should be 120 mesh sieves 〉=95wt% through delaying wash-out mud and being milled to granularity, it was 120 mesh sieves 〉=95 wt % that fluorite and Wingdale are milled to granularity, it was 100 mesh sieves 〉=95 wt % that the cob coal is milled to granularity, and the reaction mass briquetting that should be mixed is Φ 30mm～Φ 50mm before reduction reaction.
3. by the reduction magnetization beneficiation method of iron tailings claimed in claim 2, it is characterized in that: reduce good material through cyclone classification, except after abandoning ash content, mud scum, adopt the vertical ring of wet type high intensity magnetic separator to carry out magnetic separation, field intensity is 6000～12000H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110359545 CN102417970B (en) | 2011-11-15 | 2011-11-15 | Method for reducing, magnetizing and concentrating iron tailings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110359545 CN102417970B (en) | 2011-11-15 | 2011-11-15 | Method for reducing, magnetizing and concentrating iron tailings |
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| CN102417970A CN102417970A (en) | 2012-04-18 |
| CN102417970B true CN102417970B (en) | 2013-05-22 |
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| CN 201110359545 Expired - Fee Related CN102417970B (en) | 2011-11-15 | 2011-11-15 | Method for reducing, magnetizing and concentrating iron tailings |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104402335A (en) * | 2014-11-14 | 2015-03-11 | 中国建筑材料科学研究总院 | High-strength concrete employing magnetized reduced roasted iron-beneficiation tailings as admixture |
| CN105597917A (en) * | 2016-01-19 | 2016-05-25 | 中国铝业股份有限公司 | Method for increasing magnetism of weakly-magnetic iron ore |
| CN107117844B (en) * | 2017-05-25 | 2019-09-10 | 中南冶金地质研究所 | A method of cement concrete mineral admixture is prepared using reduced iron tailings |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1861265B (en) * | 2005-04-22 | 2011-09-07 | 纪礽辉 | Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite |
| CN101497933B (en) * | 2009-03-02 | 2010-12-01 | 王号德 | Method for rapidly and directly reducing haematite or limonite into ferrous powder |
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