CN1857783A - Beneficiation method for weak magnetic iron ores such as siderite, limonite and siderite paragenetic ore - Google Patents
Beneficiation method for weak magnetic iron ores such as siderite, limonite and siderite paragenetic ore Download PDFInfo
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Abstract
The invention relates to a beneficiation method for low-grade weak magnetic iron ores such as siderite, limonite and siderite paragenetic ore. The method is characterized in that weak magnetic iron ores such as single siderite, limonite and siderite paragenetic ore are subjected to rotary kiln magnetic roasting-magnetic separation-reverse flotation to obtain iron ore concentrate with the concentrate grade TFe of 62-69% and the recovery rate of 78-88%.
Description
Technical field: the invention belongs to the iron ore beneficiation technical field, especially to the beneficiation method of weak magnetic minerals such as siderite, limonite and the brown mineral intergrowth of water chestnut thereof.
Background technology: in explored iron ore reserves, siderite (comprising single siderite, limonite, the brown mineral intergrowth of water chestnut) still, has prediction to show that in world's iron ore potential resource, siderite accounts for more than 40% though account for world's iron ore reserves less than 10%.China's siderite resource is than horn of plenty, and its reserves belong to prostatitis, the world, and total amount reaches 18.34 hundred million tons.Because fine, the complicated component of siderite disseminated grain size, grade are low, iron mainly exists with the form of ferric carbonate, and the part siderite is because of Mg
2+And Mn
2+Substitute Fe
2+Form isomorph and be magnesium, manganosiderite, and compose and be stored in red (brown) iron ore and the magnetic iron ore.Brown iron ore grade is low, complicated difficult choosing, argillization very easily in grinding process in addition, and the concentrate grade and the rate of recovery all are difficult to raising.These two kinds of ore deposits are the low-grade refractory ore dressing kinds of generally acknowledging.Be fully these type of mineral resources of exploitation, abroad, the mineral of its siderite type sorted the normal conventional sorting process that adopts, as gravity treatment, high intensity magnetic separation, flotation, roasting etc. single or the part combination sort flow process.Have the siderite ore dressing plant of semi-industrial scale in several countries in last century five, sixties Eastern Europe, but it is low all to exist technical-economic index generally to teach, if any the Ukraine Ba Kaer ore dressing plant of roasting technique, concentrate grade is the highest can only to reach 53%; And for example Czech Lu Denani ore dressing plant is by the combined process flow of magnetic separation-flotation, iron concentrate grade only about 35%.Blue moral processing contains manganosiderite as German Seagal, iron concentrate grade 50%, the rate of recovery 62.8% (see А. Ц. К в α П с к о в Д. Т. Х о х А о в А. И. А х и о с т ц и а. contain the ore-dressing technique [J] of magnesian carbonate iron ore. external metallic ore ore dressing, 1975,7:46～51).The domestic practice of still not having single siderite industrial utilization so far is even if ore dressing plants such as Da Ye Iron Mine, wine steel can also can only obtain the product of iron content about 35% at the comprehensive siderite that reclaims a part of association in the flow process that sorts of iron ore.For limonite, because its theoretical grade only about 57%, and argillization very easily in grinding process, thereby not only concentrate grade is not high when causing using conventional beneficiation method sorting, and because argillization seriously causes iron recovery low, for above-mentioned reasons, China's limonite does not still have the example of large scale mining, though there is exploitation utilization in indivedual medium and small ore dressing plants, the iron concentrate grade and the rate of recovery are all extremely low.
Summary of the invention: be the iron ore deposit of siderite, limonite and the brown symbiosis of water chestnut that can effectively utilize China's abundant, the present invention carries out roasting-magnetic separation-reverse flotation flowsheet to weakly magnetic iron ores such as single siderite, limonite, the brown mineral intergrowths of water chestnut, obtain concentrate grade TFe 62～69%, the iron ore concentrate of the rate of recovery 78～88% high targets
The reaction principle of above-mentioned flow process is:
Siderite
Limonite
The course of reaction and the equipment of above-mentioned flow process are as follows:
One, the roasting stage:
Raw ore advances stove granularity: 30～0mm. after fragmentation
Roasting apparatus: static roasting (fixedly layered material) chamber type electric resistance furnace
Dynamically roasting can be guaranteed the rotary kiln of calcination atmosphere.
Roasting fuel: coal or gas
Coal (siderite is without reducing agent)) or CO gas reducing agent:
The reducing agent consumption: the coal consumption is 0～8% of a roasting material; Or it is true with The addition of C O gas
Protect kiln tail CO content 〉=0.5%;
Fuel: coal or gas that 1.28～1.70GJ/ ton raw ore can be provided;
Sintering temperature: 570 ℃～950 ℃
Roasting time: 20～150 minutes
Shrend when roasted product is come out of the stove, cooling makes in roasting process because of CO in siderite, the limonite structure rapidly
2, H
2O volatilizees and the higher loose roasted ore chance cold water explosion of the temperature of formation, thereby increases substantially the grindability of roasted ore, reaches and reduces the ore grinding expense significantly, energy saving purposes.
Two, the magnetic separation stage
Product after magnetizing roast enters grinding classification system after the shrend, enter magnetic separation behind the grind grading.
For the artificial magnet ore deposit that is phase-changed into after this class ore roasting, at the strong characteristics of its coercivity, all its magnetic is handled at grinding-classification operation and magnetic concentration working, and according to the difference of different regions roasted ore, the magnetic force of magnetic plant is distributed to be proposed to adjust.
The plant-scale equipment: conventional ore grinding, classifying equipoment, at the strong demagnetizer of artificial magnet ore deposit coercivity, magnetic separator (magnetic field intensity 79～238KA/M)
Three, the reverse flotation stage:
Eliminating further improves concentrate grade because of magnetic is mingled with, mechanical entrainment is sneaked into magnetic concentrate monomer gangue and intergrowth.
Mixing time: 3～5 minutes
Flotation time: 24～35 minutes
Flotation: cation reverse flotation or anion reverse floatation
Regime of agent:
Cation reverse flotation, regime of agent is: amine cation-collecting agent 109g/t.
Anion reverse floatation, its regime of agent is: SD 620～700g/t, NaOH 700～960g/t, CaO 160～600g/t, RA series anionic collecting agent 100～800g/t.
In the magnetic concentrate reverse flotation stage, anion reverse floatation and cation reverse flotation are suitable equally.Select suitable floating agent for use according to different regions different quality characteristics.
Description of drawings: Fig. 1 is that the present invention sorts schematic flow sheet.
The specific embodiment: embodiment: get siderite (3# sample, 4# sample); The brown symbiotic iron ore of water chestnut (1# sample, 2# sample) sample ore, essential mineral content (%) is respectively in the ore:
The 1# sample
| Mineral | Siderite | Limonite | Magnetic iron ore | Metal sulfide | Gangue and other |
| Content | 42.1 | 14.5 | 1.8 | 0.3 | 41.3 |
The 2# sample
| Sample | Magnetic iron ore | Martite | Hematite and limonite | Siderite | Pyrite | Quartzy | The chlorite illite | Apatite | Other |
| Full-page proof | 3.8 | 2.1 | 29.6 | 36.4 | 0.10 | 12.90 | 12.30 | 1.8 | 1.0 |
| Sample | 1.0 | 0.8 | 17.0 | 52.7 | 0.10 | 17.60 | 8.50 | 1.3 | 1.0 |
| Aggregate sample | 2.4 | 1.45 | 23.3 | 44.55 | 0.10 | 15.25 | 10.40 | 1.55 | 1.0 |
The 3# sample
| Mineral | Siderite | Magnetic iron ore | Limonite | Quartzy | Sericite | Other |
| Content | 41.9 | 3.5 | 0.1 | 47.9 | 5.4 | 1.2 |
The 4# sample
| Mineral | Siderite | Limonite | Chalcopyrite | Pyrite | Quartzy | Sericite | Chlorite | Other |
| Content | 55.4 | 0.6 | 0.9 | 3.2 | 19.3 | 5.4 | 4.7 | 0.5 |
Used preparation equipment:
Guarantee the rotary kiln of calcination atmosphere
Ball mill Φ 1500 * 3000mm
Spiral classifier Φ 2000mm
At the strong demagnetizer of artificial magnet ore deposit coercivity;
Wet type half many magnetic poles of adverse current magnetic separator Φ 1050 * 2400mm
Cyclone Φ 150mm
By the process that sorts of above-mentioned schematic flow sheet, the present invention gets siderite (called after 3# sample, 4# sample) respectively, the brown symbiotic iron ore of water chestnut (called after 1# sample, 2# sample) has carried out 4 groups of tests.Its main cyclic process is: get raw ore after the fragmentation and reduce magnetizing roast; Product after roasting magnetic a little less than cooling, grind grading enter is rapidly roughly selected, and the mine tailing of this operation is a discarded object, and the high intensity magnetic separation that its concentrate enters next step carries out selected; The weak magnetic rougher tailings of the mine tailing of this magnetic separation and last step operation is mixed into total mine tailing, and strong magnetic concentrate enters down the step flotation operation and carries out reverse flotation, and its concentrate is a final qualified concentrate containing of the present invention, and its mine tailing is passing through the once purging selection operation; Scavenger concentrate turns back in the concentrate through reverse flotation operation of back, scan mine tailing turns back in the other operation of initial low intensity magnetic separation, in order to further recycling again.
Test used raw ore mineral content and sort technical parameter and index such as following table for above-mentioned 4 groups:
Sort experiment by above-mentioned roasting-magnetic separation-reverse flotation flowsheet and technical parameter, its result such as following table:
Claims (2)
1. beneficiation method that relates to weakly magnetic iron ores such as siderite, limonite and water chestnut limonite mineral intergrowth, it is characterized in that: weakly magnetic iron ores such as single siderite, limonite and water chestnut limonite mineral intergrowth obtain concentrate grade TFe 62～69%, the iron ore concentrate of the rate of recovery 78～88% high targets by roasting-magnetic separation-reverse flotation flowsheet; It sorts the stage and technical parameter is:
(1) the roasting stage:
Raw ore advances stove granularity: 30～0mm after fragmentation
Roasting fuel: coal or gas
Reducing agent: coal (single siderite is without reducing agent) or CO gas;
The reducing agent consumption: the coal consumption is 0～8% of a roasting material; Or guarantee kiln tail CO content 〉=0.5% with The addition of C O gas;
Fuel: coal or gas that 1.28～1.70GJ/ ton raw ore can be provided;
Sintering temperature: 530 ℃～950 ℃;
Roasting time: 20～150 minutes;
Shrend when roasted product is come out of the stove, cooling rapidly;
(2) the magnetic separation stage:
Product after the shrend enters magnetic separation behind grind grading; At grinding-classification operation and magnetic concentration working,, its magnetic is handled at the strong characteristics of its coercivity of roasting material;
(3) the reverse flotation stage
Mixing time: 3～5 minutes
Flotation time: 24～35 minutes
Flotation: cation reverse flotation or anion reverse floatation
Regime of agent:
Wherein: cation reverse flotation, regime of agent is: amine cation-collecting agent 70～200g/t, slurry temperature: normal temperature;
Anion reverse floatation, its regime of agent is: SD 620～700g/t, NaOH 700～960g/t, CaO 160～216g/t, RA series anionic collecting agent 100～120g/t, slurry temperature: 28～32 ℃.
2. beneficiation method according to claim 1 is characterized in that: roasting stage available energy is guaranteed the dynamic roasting of rotary kiln of calcination atmosphere or with the static roasting of chamber type electric resistance furnace.
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