CN105032609A - Iron ore iron-increasing and silicon-reduction process - Google Patents
Iron ore iron-increasing and silicon-reduction process Download PDFInfo
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- CN105032609A CN105032609A CN201510432703.6A CN201510432703A CN105032609A CN 105032609 A CN105032609 A CN 105032609A CN 201510432703 A CN201510432703 A CN 201510432703A CN 105032609 A CN105032609 A CN 105032609A
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Abstract
The invention discloses an iron ore iron-increasing and silicon-reduction process. The process includes the steps that after being subjected to desulphurization by flotation, a grinding product is subjected to weak-magnetism roughing as weak-magnetism feed ore, and weak-magnetism roughing concentrate enters a large concentrate well for concentration; weak-magnetism roughing tailings are subjected to weak-magnetism scavenging, and weak-magnetism scavenging concentrate enters a large concentrate well for concentration; weak-magnetism scavenging tailings enter a large middling well for concentration and then are delivered to a high-frequency undersize sieve for slag separation through a pump, the sieved concentrate enters strong-magnetism roughing, and waste slag is left on the sieve; strong-magnetism roughing concentrate enters a large concentrate well for concentration, and strong-magnetism roughing tailings enter strong-magnetism scavenging; strong-magnetism scavenging concentrate enters a large concentrate well, and strong-magnetism scavenging tailings become final tailings. By means of the iron ore iron-increasing and silicon-reduction process, the iron grade of iron ore is improved, the silicon grade of the iron ore is lowered, accurate control over the grade of the final concentrate is achieved, the high-frequency undersize sieve is adopted for slag separation, the slag separation efficiency is improved to 100%, and the problem that a medium box of a strong magnetic separator is blocked by waste slag is solved. An alternative magnetic field is adopted for strong-magnetism roughing and strong-magnetism scavenging, so that the recovery rate of weak-magnetic minerals is increased.
Description
Technical field
The present invention relates to metallurgical mine iron ore and refine field, particularly a kind of iron ore puies forward Fe and reducing Si technique.
Background technology
China's ore has the advantages that reserves are large, grade is low, therefore can not directly be used for smelting, and need to carry out enrichment through ore dressing process to valuable mineral, harmful substance removes.
In iron ore dressing field, the conventional method carrying Iron grade generally has: adopt weak magnet drum to sort for magnetic iron ore, high intensity magnetic separation is adopted to sort for the weak magnetism mineral that magnetic is more weak; selecting process common are stage grinding-stage grading; stage grinding-magnetic separation-dusting cover, stage grinding-high intensity magnetic separation-low intensity magnetic separation-gravity treatment.In addition the technique adopting magnetizing roast to improve iron concentrate grade is also had.For different Ore performance, adopt different purifying technique flow processs.Current more employing combined process flow, due to succeeding in developing of Novel heavy optional equipment and strong magnetic separation equipment, combined process flow is used widely in the sorting of hematite is produced, as the gravity treatment-magnetic separation-flotation flowsheet of neat dashan concentrator, high intensity magnetic separation-classification-spiral chute-centrifugal classifier magnetic reconnection interflow the journey of Gongchangling Tails, its separation index is all greatly improved than during the single method for separating of employing.
Plum mountain ore type is hematite, based on magnetic iron ore, containing bloodstone, pyrite, siderite, magnetic iron ore etc., ore type is more, also containing objectionable impurities such as sulphur, phosphorus, silicon in ore, need that desulfurization is carried out to the type iron ore, carry Fe and reducing Si etc. and sort, just can obtain qualified iron ore concentrate.Simultaneously, plum mountain ore is half autolyzed ore (alkaline ore), and the iron ore grade of ore that namely ore dressing obtains does not need to reach smelting grade requirement, and it is more high better namely not require, this half self-fluxing ore when entering blast furnace ironmaking, the Ca (OH) in ore
2, the material such as NaOH can be oxidized, thus iron ore grade is improved when smelting.Therefore, the Beneficiation flowsheet for this ore should be able to accurately control final concentrate grade in the reasonable scope.For plum mountain ore, iron concentrate grade controls 57.3% ± 0.1%.
Summary of the invention
The object of the invention is for solving the problem, providing a kind of iron ore and putting forward Fe and reducing Si technique.
In order to achieve the above object, the invention provides following technical scheme: a kind of iron ore puies forward Fe and reducing Si technique, comprises the following steps:
(1) ore milling product is entered weak magnetic as weak magnetic to ore deposit after floatation desulphurization to roughly select, obtain weak magnetic rougher concentration and weak magnetic rougher tailings;
(2) weak magnetic rougher concentration is entered the large well of concentrate to concentrate, weak magnetic rougher tailings enters weak magnetic and scans;
(3) weak magnetic is scanned and to be obtained and weak magnetic scans mine tailing;
(4) weak magnetic scavenger concentrate is entered the large well of concentrate to concentrate, weak magnetic scan mine tailing enter the large well of chats concentrate;
(5) use after concentrated and be pumped into high frequency fine screen and carry out every slag, enter strong magnetic under sieve and roughly select, sieve forms waste residue;
(6) strong magnetic rougher concentration enters the large well of concentrate and concentrates, and strong magnetic rougher tailings enters strong magnetic and scans;
(7) strong magnetic scavenger concentrate enters the large well of concentrate, and strong magnetic is scanned mine tailing and formed true tailings.
Preferred as the one doing invention, described weak magnetic adopts dovetail type to ore deposit chute to ore deposit.
Preferred as the one doing invention, described strong magnetic is roughly selected to scan with strong magnetic to adopt and is intersected magnetic system.
Preferred as one of the present invention, described weak magnetic is roughly selected and is adopted φ 1500mm half adverse current type permanent-magnet drum type magnetic separator, magnetic field intensity 2000Oe.
Preferred as one of the present invention, described weak magnetic is scanned and is adopted φ 1500mm half adverse current type permanent-magnet drum type magnetic separator, magnetic field intensity 3000Oe.
Preferred as one of the present invention, described strong magnetic is roughly selected and is adopted φ 1750mm pulsating high gradient magnetic separator, horizontal magnetic system, φ 2mm dielectric rod, magnetic field intensity 1.0T.
Preferred as one of the present invention, described strong magnetic is scanned and is adopted φ 2500mmSlon pulsating high gradient magnetic separator, vertical magnetic system, φ 2mm dielectric rod, magnetic field intensity 1.2T.
Preferred as one of the present invention, described high frequency fine screen adopts 2FMVSm2020mm high frequency fine screen, screen size 1.0 × 2.5mm, adopts polyurethane screen.
Preferred as one of the present invention, concentrate, chats thickener all adopt CN-50m peripheral-traction formula concentrator.
Beneficial effect:
1, iron ore Iron grade can be increased to 57% by 46% by technique of the present invention, silicon grade is reduced to less than 5% by 12.3%.
2, by the exciting curent in adjustment high-intensity magnetic separation stage, the accurate control to final concentrate grade can be realized.
3, have employed high frequency fine screen to carry out every slag, be increased to 100% every slag efficiency, eliminate the problem that strong magnetic machine cartridge is blocked by waste residue.
4, low intensity magnetic separation innovative design " dovetail " point ore deposit device, enables large-scale weak magnetic separator all spare to ore deposit, improves and sort efficiency.
5, strong magnetic is roughly selected, strong magnetic scans and have employed alternating fields, improves the rate of recovery of weak magnetic mineral.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention;
Fig. 2 is that dovetail type of the present invention is to the structural representation of ore deposit chute;
Fig. 3 is the schematic diagram that the strong magnetic of the present invention roughly selects magnetic direction;
Fig. 4 is the schematic diagram that the strong magnetic of the present invention scans magnetic direction.
Detailed description of the invention
Below with reference to specific embodiment, technical scheme provided by the invention is described in detail, following detailed description of the invention should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
The invention discloses a kind of iron ore as shown in Figure 1 and put forward Fe and reducing Si technique, comprise the following steps:
(1) ore milling product is entered weak magnetic as weak magnetic to ore deposit after floatation desulphurization to roughly select, obtain weak magnetic rougher concentration and weak magnetic rougher tailings;
(2) weak magnetic rougher concentration is entered the large well of concentrate to concentrate, weak magnetic rougher tailings enters weak magnetic and scans;
(3) weak magnetic is scanned and to be obtained and weak magnetic scans mine tailing;
(4) weak magnetic scavenger concentrate is entered the large well of concentrate to concentrate, weak magnetic scan mine tailing enter the large well of chats concentrate;
(5) use after concentrated and be pumped into high frequency fine screen and carry out every slag, enter strong magnetic under sieve and roughly select, sieve forms waste residue;
(6) strong magnetic rougher concentration enters the large well of concentrate and concentrates, and strong magnetic rougher tailings enters strong magnetic and scans;
(7) strong magnetic scavenger concentrate enters the large well of concentrate, and strong magnetic is scanned mine tailing and formed true tailings.
The equipment that above-mentioned technique adopts is respectively: weak magnetic is roughly selected and adopted φ 1500mm half adverse current type permanent-magnet drum type magnetic separator, magnetic field intensity 2000Oe.Weak magnetic is scanned and is adopted φ 1500mm half adverse current type permanent-magnet drum type magnetic separator, magnetic field intensity 3000Oe.Adopt 2FMVSm2020mm high frequency fine screen to carry out every slag, screen size 1.0 × 2.5mm, adopt polyurethane screen.Strong magnetic is roughly selected and is adopted φ 1750mm pulsating high gradient magnetic separator, horizontal magnetic system, φ 2mm dielectric rod, magnetic field intensity 1.0T.Strong magnetic is scanned and is adopted φ 2500mmSlon pulsating high gradient magnetic separator, vertical magnetic system, φ 2mm dielectric rod, magnetic field intensity 1.2T.Concentrate, chats thickener all adopt CN-50m peripheral-traction formula concentrator.
The iron mineral grade of strong magnetic rougher concentration and strong magnetic scavenger concentrate can regulate by adjusting strong magnetic machine exciting curent, and when exciting curent is large, high intensity magnetic mineral is of high grade, exciting curent hour, and high intensity magnetic mineral grade is low.By adjusting high intensity magnetic mineral grade, control the grade of final concentrate.
Weak magnetic mine-feeding equipment adopts " dovetail type " to ore deposit chute, and what can realize large-scale weak magnetic separator all spares to ore deposit, and version as follows as shown in Figure 2.
The several piece steel baffle plate arranged in chute, ore pulp is uniformly distributed on whole section, and square aperture is set on baffle plate, the aperture of every block baffle plate is dislocatedly distributed, meet coarse fraction mineral and feed magnetic separator cell body smoothly, avoid the gathering of coarse fraction mineral in chute, cover plate place, chute top arranges a steel baffle plate, not only serve minimizing ore pulp to splash, overflow, also give the mixing of ore pulp simultaneously, reduce flow velocity, reduce and certain effect is played to cylindrical shell impact.
As shown in Figure 3 and Figure 4, strong magnetic is roughly selected to scan with strong magnetic to adopt and is intersected magnetic system, and namely roughly select and have employed horizontal magnetic system, scan and adopt vertical magnetic system, alternately the rate of recovery of magnetic mineral can improve in magnetic system, improves concentrate output, reduces tailings grade, avoids the wasting of resources.
Low intensity magnetic separation mainly for the recovery of strongly magnetic mineral, as magnetic iron ore (Fe
3o
4).High intensity magnetic separation mainly for weak magnetic mineral, as bloodstone (Fe
2o
3), siderite (FeCO
33H
2o), limonite (2Fe
2o
3), magnetic iron ore (Fe
1-xs).Low intensity magnetic separation and high intensity magnetic separation all adopt the technique slightly swept, and object improves the rate of recovery of iron mineral.
The sorting process index of this technique is:
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, also comprises the technical scheme be made up of above technical characteristic.
Claims (9)
1. iron ore puies forward a Fe and reducing Si technique, it is characterized in that: comprise the following steps:
(1) ore milling product is entered weak magnetic as weak magnetic to ore deposit after floatation desulphurization to roughly select, obtain weak magnetic rougher concentration and weak magnetic rougher tailings;
(2) weak magnetic rougher concentration is entered the large well of concentrate to concentrate, weak magnetic rougher tailings enters weak magnetic and scans;
(3) weak magnetic is scanned and to be obtained and weak magnetic scans mine tailing;
(4) weak magnetic scavenger concentrate is entered the large well of concentrate to concentrate, weak magnetic scan mine tailing enter the large well of chats concentrate;
(5) use after concentrated and be pumped into high frequency fine screen and carry out every slag, enter strong magnetic under sieve and roughly select, sieve forms waste residue;
(6) strong magnetic rougher concentration enters the large well of concentrate and concentrates, and strong magnetic rougher tailings enters strong magnetic and scans;
(7) strong magnetic scavenger concentrate enters the large well of concentrate, and strong magnetic is scanned mine tailing and formed true tailings.
2. a kind of iron ore according to claim 1 puies forward Fe and reducing Si technique, it is characterized in that: described weak magnetic adopts dovetail type to ore deposit chute to ore deposit.
3. a kind of iron ore according to claim 1 puies forward Fe and reducing Si technique, it is characterized in that: described strong magnetic is roughly selected to scan with strong magnetic to adopt and intersected magnetic system.
4. a kind of iron ore according to claim 1 puies forward Fe and reducing Si technique, it is characterized in that: described weak magnetic is roughly selected and adopted φ 1500mm half adverse current type permanent-magnet drum type magnetic separator, magnetic field intensity 2000Oe.
5. a kind of iron ore according to claim 1 puies forward Fe and reducing Si technique, it is characterized in that: described weak magnetic is scanned and adopted φ 1500mm half adverse current type permanent-magnet drum type magnetic separator, magnetic field intensity 3000Oe.
6. a kind of iron ore according to claim 1 puies forward Fe and reducing Si technique, it is characterized in that: described strong magnetic is roughly selected and adopted φ 1750mm pulsating high gradient magnetic separator, horizontal magnetic system, φ 2mm dielectric rod, magnetic field intensity 1.0T.
7. a kind of iron ore according to claim 1 puies forward Fe and reducing Si technique, it is characterized in that: described strong magnetic is scanned and adopted φ 2500mmSlon pulsating high gradient magnetic separator, vertical magnetic system, φ 2mm dielectric rod, magnetic field intensity 1.2T.
8. a kind of iron ore according to claim 1 puies forward Fe and reducing Si technique, it is characterized in that: described high frequency fine screen adopts 2FMVSm2020mm high frequency fine screen, screen size 1.0 × 2.5mm, adopts polyurethane screen.
9. a kind of iron ore according to claim 1 puies forward Fe and reducing Si technique, it is characterized in that: concentrate, chats thickener all adopt CN-50m peripheral-traction formula concentrator.
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Cited By (6)
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| CN107433226A (en) * | 2016-05-27 | 2017-12-05 | 南京梅山冶金发展有限公司 | A kind of method that acid sludge recycles |
| CN107824332A (en) * | 2016-09-15 | 2018-03-23 | 南京梅山冶金发展有限公司 | A kind of high intensity magnetic separation method for distinguishing of mineral |
| CN109351470A (en) * | 2018-11-30 | 2019-02-19 | 广州粤有研矿物资源科技有限公司 | Mine choosing method and mine select system |
| CN109894366A (en) * | 2017-12-11 | 2019-06-18 | 南京梅山冶金发展有限公司 | The fine pre-selection technique of the red water chestnut compound iron ore of magnetic |
| CN109894256A (en) * | 2017-12-11 | 2019-06-18 | 南京梅山冶金发展有限公司 | Low-grade iron ore powder mentions iron and drops miscellaneous beneficiation method |
| CN113457834A (en) * | 2021-06-30 | 2021-10-01 | 中冶北方（大连）工程技术有限公司 | Mineral processing technology for recovering high-grade iron ore concentrate from copper tailings |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107433226A (en) * | 2016-05-27 | 2017-12-05 | 南京梅山冶金发展有限公司 | A kind of method that acid sludge recycles |
| CN107824332A (en) * | 2016-09-15 | 2018-03-23 | 南京梅山冶金发展有限公司 | A kind of high intensity magnetic separation method for distinguishing of mineral |
| CN109894366A (en) * | 2017-12-11 | 2019-06-18 | 南京梅山冶金发展有限公司 | The fine pre-selection technique of the red water chestnut compound iron ore of magnetic |
| CN109894256A (en) * | 2017-12-11 | 2019-06-18 | 南京梅山冶金发展有限公司 | Low-grade iron ore powder mentions iron and drops miscellaneous beneficiation method |
| CN109351470A (en) * | 2018-11-30 | 2019-02-19 | 广州粤有研矿物资源科技有限公司 | Mine choosing method and mine select system |
| CN113457834A (en) * | 2021-06-30 | 2021-10-01 | 中冶北方（大连）工程技术有限公司 | Mineral processing technology for recovering high-grade iron ore concentrate from copper tailings |
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Application publication date: 20151111 |