CN103894285B - A kind of magnetic iron ore dressing process - Google Patents
A kind of magnetic iron ore dressing process Download PDFInfo
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- CN103894285B CN103894285B CN201410147545.5A CN201410147545A CN103894285B CN 103894285 B CN103894285 B CN 103894285B CN 201410147545 A CN201410147545 A CN 201410147545A CN 103894285 B CN103894285 B CN 103894285B
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Abstract
The invention discloses a kind of magnetic iron ore dressing process, this technique comprises fragmentation, ball milling, magnetic separation, high intensity magnetic separation and enters circulation barrel carries out the techniques such as stirring is selected, and the ore deposit overflow after selected enters concentrate pond and adopts high-pressure sprayer to carry out cleaning removal of impurities pressure ore deposit and obtains concentrate; The ore deposit that simultaneously non-overflow enters concentrate pond is again sent into magnetic separation unit through pumping line and is carried out magnetic separation.Cost of the present invention is low, energy consumption is low, technique is simple, the rate of recovery is high, just greatly can promote iron ore grade without the need to adding medicament.
Description
Technical field
The present invention relates to a kind of technique of preparing, be specifically related to a kind of magnetic iron ore dressing process.
Background technology
The main feature of China's iron ore is " poor ", " carefully ", " mixing ", and Iron grade 32%-37% is about lower than world average grade 10 percentage points.Wherein the iron ore of 97% needs ore dressing process, and magnetic iron ore ore dressing is the main body of iron ore dressing always, in China's iron ore concentrate output, and mainly magnetite concentrate.Current magnetite separation technology adopts the other technique of the stage grinding of single low intensity magnetic separation-stage low intensity magnetic separation mostly, this Processes and apparatus is not suitable for the ore dressing of the chromium depleted zone stone of fine-grained disseminated grain, and the rate of recovery of iron is low in iron ore concentrate, be generally less than 70%, iron concentrate grade is low, impurity content is high, is not suitable for the requirement of metallurgical industry high quality burden and energy-conserving and environment-protective.
Summary of the invention
For above-mentioned weak point, the invention provides that a kind of cost is low, energy consumption is low, technique is simple, the rate of recovery is high, without the need to adding medicament and greatly promoting the magnetic iron ore dressing process of iron ore grade.
In order to achieve the above object, the invention provides following technical scheme:
A kind of magnetic iron ore dressing process, comprises the following steps:
(1) the magnetic iron ore raw ore from stope is carried out one-level fragmentation by disintegrating machine, require that ore discharge granularity is not more than 200mm, product after one-level fragmentation again enters jaw crusher and carries out two-stage crushing, require that ore discharge granularity is not more than 40mm, product after two-stage crushing and water enter ball mill grinding again with the mass ratio of 1:1, ore pulp after grinding enters high-frequency screen and sieves, and oversize particle degree is greater than 100 object products and returns ball mill and again carry out grinding; The magnetic separation unit that after screening, qualified ore pulp and water enter 2500-3000 Gauss with the mass ratio of 1:2 carries out magnetic separation, obtains rough concentrate and mine tailing; The intensity magnetic separator magnetic separation that mine tailing enters 4000-4500 Gauss again obtains secondary rough concentrate and mine tailings, and mine tailings directly enter tailings pond and separately use it for anything else;
(2) above-mentioned rough concentrate and secondary rough concentrate being entered circulation barrel carries out selected, and the ore deposit overflow after selected enters concentrate pond and adopts giant to carry out cleaning removal of impurities pressure ore deposit and obtains concentrate; The ore deposit that simultaneously non-overflow enters concentrate pond is again sent into magnetic separation unit through pumping line and is carried out magnetic separation.
Described magnetic separation unit is made up of the magnetic separator of 3 2500-3000 Gausses.
The described equipment for magnetite beneficiation process, comprise cooperatively interact disintegrating machine, ball mill, high-frequency screen, magnetic separation unit, intensity magnetic separator, circulation barrel and concentrate pond.
Described magnetic separation unit is made up of 3 magnetic separators, and magnetic separator is provided with the concentrate carrier pipe matched with circulation barrel, and the rough concentrate that concentrate carrier pipe is used for magnetic separator to select is sent in circulation barrel.
Described intensity magnetic separator is also provided with the concentrate carrier pipe matched with circulation barrel, and the secondary rough concentrate that this concentrate carrier pipe is used for intensity magnetic separator to select is sent in circulation barrel.
In described circulation barrel, agitating device is installed, this agitating device stirs the rough concentrate entered in circulation barrel and secondary rough concentrate and (is equivalent to stirring selected, the ore deposit that impurity or purity are not high is just in agitator middle and upper part, the ore deposit that purity is high is in agitator middle and lower part, because ore deposit purity gets over high specific gravity with large).
Inside described circulation barrel one, middle and lower part is provided with concentrate overflow pipe, and this concentrate overflow pipe is connected with concentrate pond, circulation barrel by stir rough concentrate and secondary rough concentrate mixture enter concentrate pond by the overflow of concentrate overflow pipe; Be provided with to wind apparatus in described concentrate overflow pipe arrival end, should to wind apparatus by air compressor to wind, overflow is entered the impurity blowout that concentrate overflow pipe endosome is light, thus makes impurity can not enter concentrate overflow pipe and then more effectively improve concentrate quality.
Also be provided with a pumping line matched with magnetic separation unit on the upside of described circulation barrel, the ore deposit that non-overflow is entered concentrate pond by this pumping line is again sent into magnetic separation unit and is carried out magnetic separation.
Also be provided with high-pressure sprayer bottom described concentrate pond, its effect utilizes hydraulic pressure to be compressed by force by concentrate, and impurity is swept along with the water. simultaneously, improves concentrate grade further.
Cost of the present invention is low, energy consumption is low, technique is simple, the rate of recovery is high, just greatly iron ore grade can be promoted without the need to adding medicament, compared with traditional handicraft, add intensity magnetic separator: reclaim the Iron concentrate gone in tailings, the rate of recovery exceeds normal recovery about 10%, set up circulation barrel: allow ore deposit stop at circulation barrel after magnetic separator, the concentrate that purity is high, concentrate pond is overflowed to through concentrate overflow pipe, use in concentrate overflow pipe simultaneously and load to wind apparatus, object is gone out by impurity wind light for body and it can not be entered concentrate overflow pipe thus more effectively improve concentrate quality.In addition: circulation barrel is provided with pumping line, its effect magnetic separation unit is sent into again through sand pump in ore deposit (comprising to the impurity of wind apparatus blowout) not high for ore deposit liquid level purity carry out magnetic separation (under normal circumstances, common process magnetic separation unit is per hour carries out washing once to 10 tons of ore deposits, but adopts circulation barrel can ensure per hourly to have carried out 3-4 washup to 10 tons of ore deposits) thus reach the object of improving the quality of products; Concentrate pond is provided with high-pressure sprayer, and its effect again to carry out cleaning removal of impurities to concentrate and to utilize hydraulic pressure to be compressed by force by concentrate, to be convenient to shipment and to deposit.
Accompanying drawing explanation
Fig. 1 present invention process flow chart.
Circulation barrel structural representation in Fig. 2 the present invention.
Concentrate pond and water injector result schematic diagram in Fig. 3 the present invention.
In figure: 1. concentrate carrier pipe; 2. agitating device; 3. concentrate overflow pipe; 4. give wind apparatus; 5. pumping line; 6. high-pressure sprayer.
Detailed description of the invention
We will the present invention is further elaborated by reference to the accompanying drawings below.
Embodiment 1
For grade iron content 36.84% Pingwu iron ore, this iron ore is carried out one-level fragmentation by disintegrating machine, ore discharge granularity is not more than 200mm, product after one-level fragmentation again enters jaw crusher and carries out two-stage crushing, ore discharge granularity is not more than 40mm, product after two-stage crushing and water enter ball mill grinding again with the mass ratio of 1:1, and the ore pulp after grinding enters high-frequency screen and sieves, and oversize particle degree is greater than 100 object products and returns ball mill and again carry out grinding; The ore pulp of screening rear qualified (product granularity is not more than 100 orders) and water enter magnetic separation unit with the mass ratio of 1:2 and carry out magnetic separation, and this magnetic separation unit is made up of the magnetic separator of 3 2500-3000 Gausses, and ore pulp obtains rough concentrate and mine tailing after entering magnetic separator magnetic separation; Rough concentrate enters in circulation barrel by concentrate carrier pipe 1, and the intensity magnetic separator magnetic separation that mine tailing enters 4000-4500 Gauss again obtains secondary rough concentrate and mine tailings, secondary rough concentrate also enters in circulation barrel by concentrate carrier pipe 1, and mine tailings directly enter tailings pond and separately use it for anything else; The mixture of rough concentrate and secondary rough concentrate is undertaken stirring by the agitating device 2 in circulation barrel and (is equivalent to stir selected, the ore deposit that impurity or purity are not high is just in agitator middle and upper part, the ore deposit that purity is high is in agitator middle and lower part, because ore deposit purity gets over high specific gravity with large), the ore deposit being in agitator middle and lower part by concentrate overflow pipe 3 overflow to concentrate pond, in this process, wind apparatus 4 of giving in concentrate overflow pipe 3 arrival end passes through ceaselessly to dry and will enter the impurity blowout concentrate overflow pipe 3 of concentrate overflow pipe 3, does not allow it enter concentrate pond; Simultaneously, pumping line 5 is used again to send into magnetic separation unit to the not high ore deposit of concentrate overflow pipe 3 purity (comprising the impurity blown out to wind apparatus 4) carry out magnetic separation by being in the non-overflow in agitator middle and upper part, the ore deposit entering concentrate pond utilizes hydraulic pressure to be compressed in ore deposit by force by the flushing removal impurity of high-pressure sprayer (3-6Mpa) simultaneously, finally obtains the concentrate of grade iron content 65.53%.
Simultaneously, from magnetic separation unit and intensity magnetic separator, the concentrate of circulation barrel and secondary concentrate mixture are entered to the present embodiment and detects to obtain the grade iron content 55.12% of this mixture, this concentrate grade iron content 64.23% is detected to obtain to the concentrate entered in concentrate overflow pipe, when learning the technique adopted without circulation barrel equipment thus, gained concentrate grade iron content is only 55.12%, adopt without during to the technique of wind apparatus and high-pressure sprayer, gained concentrate grade iron content is 64.23%.
Embodiment 2
For the Aba river iron ore of grade iron content 33.62%, dressing process is example 1 simultaneously, finally draws the concentrate of grade iron content 64.44%.
Equally, from magnetic separation unit and intensity magnetic separator, the concentrate of circulation barrel and secondary concentrate mixture are entered to the present embodiment and detects to obtain the grade iron content 54.49% of this mixture, this concentrate grade iron content 62.78% is detected to obtain to the concentrate entered in concentrate overflow pipe, when learning the technique adopted without circulation barrel equipment thus, gained concentrate grade iron content is only 54.49%, adopt without during to the technique of wind apparatus and high-pressure sprayer, gained concentrate grade iron content is 62.78%.
Embodiment 3
Iron concentrate is selected for An County, Mianyang domestic grade iron content 50% sulfate slag, dressing process is example 1 simultaneously, ball mill grinding is directly entered without fragmentation unlike sulfate slag, the Iron concentrate taste iron content 62-63% finally obtained, the rate of recovery reaches more than 70%, select factory's iron content to exceed 5-7% than other, various impurity low go out more than one times, the rate of recovery exceeds more than 10%.
Equally, from the Iron concentrate that magnetic separation unit and intensity magnetic separator enter circulation barrel, the grade iron content 58% of this Iron concentrate is detected to obtain to the present embodiment, this concentrate grade iron content 61% is detected to obtain to the Iron concentrate entered in concentrate overflow pipe, when learning the technique adopted without circulation barrel equipment thus, gained concentrate grade iron content is only 57%, adopt without during to the technique of wind apparatus and high-pressure sprayer, gained concentrate grade iron content is 61%.
Present invention process not only can apply the ore-dressing technique to all magnetic ores, is also applied to sulfate slag and reclaims in the techniques such as iron ore concentrate.
Claims (2)
1. a magnetic iron ore dressing process, is characterized in that, this technique comprises the following steps:
Step 1: the magnetic iron ore raw ore from stope is carried out one-level fragmentation by disintegrating machine, require that ore discharge granularity is not more than 200mm, product after one-level fragmentation again enters jaw crusher and carries out two-stage crushing, require that ore discharge granularity is not more than 40mm, product after two-stage crushing and water enter ball mill grinding again with the mass ratio of 1:1, and the ore pulp after grinding enters high-frequency screen and sieves; Oversize particle degree is greater than 100 object products and returns ball mill and again carry out grinding, and the magnetic separation unit that after screening, qualified ore pulp and water enter 2500-3000 Gauss with the mass ratio of 1:2 carries out magnetic separation, obtains rough concentrate and mine tailing; The intensity magnetic separator magnetic separation that mine tailing enters 4000-4500 Gauss again obtains secondary rough concentrate and mine tailings, and mine tailings directly enter tailings pond and separately use it for anything else;
Step 2: above-mentioned rough concentrate and secondary rough concentrate being entered circulation barrel, to carry out stirring selected, the ore deposit overflow after selected enters concentrate pond and adopts high-pressure sprayer to carry out cleaning removal of impurities pressure ore deposit and obtains concentrate; The ore deposit that simultaneously non-overflow enters concentrate pond is again sent into magnetic separation unit through pumping line and is carried out magnetic separation;
Equipment for above-mentioned magnetite beneficiation process comprise cooperatively interact disintegrating machine, ball mill, high-frequency screen, magnetic separation unit, intensity magnetic separator, circulation barrel and concentrate pond; Described magnetic separation unit is made up of 3 magnetic separators, and magnetic separator is provided with the concentrate carrier pipe (1) matched with circulation barrel;
Described intensity magnetic separator is also provided with the concentrate carrier pipe (1) matched with circulation barrel;
Agitating device (2) is installed in described circulation barrel;
Inside described circulation barrel one, middle and lower part is provided with concentrate overflow pipe (3), and this concentrate overflow pipe (3) is connected with concentrate pond;
Be provided with to wind apparatus (4) in described concentrate overflow pipe (3) arrival end;
A pumping line matched with magnetic separation unit (5) is also provided with on the upside of described circulation barrel;
High-pressure sprayer (6) is also installed bottom described concentrate pond;
Described magnetic separation unit is made up of the magnetic separator of 3 2500-3000 Gausses.
2. magnetic iron ore dressing process according to claim 1 reclaims the application in iron ore concentrate at sulfate slag.
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| CN201410147545.5A CN103894285B (en) | 2014-04-14 | 2014-04-14 | A kind of magnetic iron ore dressing process |
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| CN103894285B true CN103894285B (en) | 2016-03-16 |
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| CN104401764B (en) * | 2014-11-14 | 2016-03-30 | 攀钢集团矿业有限公司 | Material-transporting system and mineral processing production line |
| KR101667651B1 (en) * | 2015-04-03 | 2016-10-21 | 한국지질자원연구원 | Method for producting iron concentrate from low grade iron ore using dry separating proocess |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4070274A (en) * | 1976-03-11 | 1978-01-24 | United States Steel Corporation | Coarse concentrated iron ore for catalytic purposes |
| CN101362116A (en) * | 2008-10-09 | 2009-02-11 | 王修安 | Large-sized energy-saving ore processing equipment and technique |
| WO2009094612A2 (en) * | 2008-01-25 | 2009-07-30 | O'brien & Gere Engineers, Inc. | In-line milling system |
| CN101573614A (en) * | 2007-01-02 | 2009-11-04 | 通用电气健康护理生物科学股份公司 | Separation media slurry tank |
| CN102228865A (en) * | 2010-07-30 | 2011-11-02 | 鞍钢集团矿业公司 | Novel wet-type strong-magnetic pre-separation process of weak-magnetic low-grade iron mineral roller mill |
| CN103495495A (en) * | 2013-10-23 | 2014-01-08 | 会理县鸿运有限责任公司 | Super-low-grade iron ore beneficiation method |
-
2014
- 2014-04-14 CN CN201410147545.5A patent/CN103894285B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4070274A (en) * | 1976-03-11 | 1978-01-24 | United States Steel Corporation | Coarse concentrated iron ore for catalytic purposes |
| CN101573614A (en) * | 2007-01-02 | 2009-11-04 | 通用电气健康护理生物科学股份公司 | Separation media slurry tank |
| WO2009094612A2 (en) * | 2008-01-25 | 2009-07-30 | O'brien & Gere Engineers, Inc. | In-line milling system |
| CN101362116A (en) * | 2008-10-09 | 2009-02-11 | 王修安 | Large-sized energy-saving ore processing equipment and technique |
| CN102228865A (en) * | 2010-07-30 | 2011-11-02 | 鞍钢集团矿业公司 | Novel wet-type strong-magnetic pre-separation process of weak-magnetic low-grade iron mineral roller mill |
| CN103495495A (en) * | 2013-10-23 | 2014-01-08 | 会理县鸿运有限责任公司 | Super-low-grade iron ore beneficiation method |
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