CN104888958B - Micro-fine particle red magnetic mixed iron ore sorting process - Google Patents
Micro-fine particle red magnetic mixed iron ore sorting process Download PDFInfo
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Abstract
The invention relates to a micro-fine particle red magnetic mixed iron ore sorting process characterized by including stage grinding-classification-weak magnetic operation-strong magnetic operation-anionic reverse flotation operation, the anionic reverse flotation is performed by use of a one-coarse, one-fine and large circulation mine returning three-scavenging system. According to the micro-fine particle red magnetic mixed iron ore sorting process, first stage ball-milling is performed, then weak magnetic-strong magnetic separation is performed, excess-grinding is effectively prevented, the effect of the magnetic separation can be ensured; after secondary stage ball-milling, anionic reverse flotation operation is directly performed, the advantage of good micro-fine particle iron ore sorting effect of reverse flotation is full used, by use of the technological process, iron concentrate with the iron grade of 65% and the iron recovery rate of more than 73% can be obtained, the final sorting indicators can be further optimized, and the high recovery rate of the iron concentrate can be ensured.
Description
Technical field
The invention belongs to iron ore beneficiation technical field, particularly a kind of microfine red magnetic mixing iron mine sorting process.
Background technology
China's Shanxi Yuan Jiacun iron mine is a large deposited metamorphic iron bed, and about 12.62 hundred million tons of reserves belong to microfine multiple
Miscellaneous difficulty selects red magnetic mixing lean ore.Yuan Jia village Iron Ore Reserve is big, and the exploitation of this ore deposit are to Taiyuan Iron and Steel Co. group or even whole China iron deposit
Stone supply all will serve positive role.This ore deposit is found in the sixties in last century, due to being mainly the oxide ores such as bloodstone, and
Ore species is various, and iron mine species include quartz type primary ore, quartz type oxide ore, quartz type speculum iron, quartz type spiegel
Secondary lean ore, quartz type (magnetic) bloodstone, amphibole type oxide ore, Conglomerate Type iron mine totally seven kinds can type selecting；Its valuable mineral embedding cloth grain
Degree is tiny, and grinding particle size is p80=25-30 micron, it is developed and utilized extremely difficult.Traditional based on bloodstone
Ore-dressing technique is gravity treatment-magnetic separation-anion reverse floatation combined process flow, and the such as ore dressing plant such as Anshan iron and steel plant, this steel, Hebei iron and steel is applied very
Many, useful mineral disseminated grain size in these mines is thicker, because gravity treatment granularity is far above p80=25-30 micron, uses this flow process
Process the red magnetic iron ore of microfine and have that the level of reselection tailings is too high, the iron ore concentrate response rate is low.In addition, it is anti-to enter anion after magnetic separation
The granularity of flotation mostly be 95% -0.074mm(p80 be about 43 μm), generally all pass through one roughing, primary cleaning, three sweep or
Four scan and can get qualified iron ore concentrate, and reverse flotation is to sweep floatation underflow concentrate order to return, i.e. the bottom of operation is scanned in this section of flotation
Stream concentrate return to upper level flotation scan operation to ore deposit, referred to as partial circulating technique), flotation time was at 100 minutes to 110
Minute.For flotation, the length of flotation time is closely related with the flotation speed of ore particle, and the flotation speed of ore particle and mineral
Granularity is relevant, because milling ore granularity is too thin, in order to obtain rational concentrate grade and the response rate it is necessary to extend flotation when
Between, increase and scan hop count.By to Taiyuan Iron and Steel Co. Yuan Jia village Hematite, iron mineral disseminated grain size is fine micro- for p80=25-30
Rice experimental study finds, to according to conventional hematite reverse flotation partial circulating technological process, floatation process be then one roughing,
Primary cleaning, scan for four-five times, not only flotation time will reach 134 minutes and it is necessary to sweep flotation using four times-five times,
Iron concentrate grade can be made to reach 65%, operation recovery can only achieve 77%, long using this technique flotation time, the response rate is low,
Flotation device used is many, and investment is high, and operating charges are high, high cost.
Content of the invention
It is an object of the invention to provide one kind effectively can be sorted to microfine Refractory iron ore, sorting result is good,
The high microfine red magnetic mixing iron mine sorting process of the high iron ore concentrate response rate of Iron grade.
The purpose of the present invention is realized by following technical proposals:
A kind of microfine red magnetic mixing iron mine sorting process of the present invention it is characterised in that include stage grinding-classification-
Weak magnetic-strong magnetic-anion reverse floatation operation, specifically comprises the following steps that
1) by granularity after coarse crushing be p80=150mm, grade be 30%-32% microfine red magnetic mixing iron mine feed Semi-Autogenous
Equipment carries out ore grinding, and the ore discharge of Semi-Autogenous equipment feeds vibrosieve and sieved, and under sieving after screening, < product of 12mm feeds one
The closed circuit ball grinder graded operation of section, oversize returns Semi-Autogenous equipment and is regrinded；
2) granularity of one section of closed circuit ball grinder graded operation reaches p80=65 μm of overflow product and feeds one section of weak magnetic operation, product
Position is 26%, and after the concentrated machine of one section of weakly magnetic tailings of the response rate 68% concentrates, thickener underflow product feeds one section strong magnetic operation,
Thickener overflow feeds recirculated water, and grade is 53%, the response rate be 32% one section of inferior fine magnetite concentrate and grade be 36%, the response rate is
The closed circuit ball grinder graded operation of two-stage nitration is fed after 59% one section of high intensity magnetic mineral mixing；
3) two-stage nitration ball milling and the sand setting return closed circuit ball grinder graded operating system of two-stage nitration after classification are regrinded, and two-stage nitration is closed circuit
The granularity of ball grinder graded operation is that the overflow product of p80=25-30 micron feeds concentration operation before flotation；Concentration is 30%, granularity
Underflow product for the thickener of p80=25-30 micron feeds anion reverse floatation operating system, and the overflow of thickener feeds and follows
Ring water,
4) anion reverse floatation described in is returned mine using a thick, essence and systemic circulation and three is swept system job, and concrete steps are such as
Under:
A) by concentration be 30%, granularity be p80=25-30 micron thickener underflow product feed roughing flotation operation, float
The underflow concentrate that operation is roughly selected in choosing feeds the selected operation of flotation, and the foam mine tailing of roughing flotation operation feeds scans operation,
The foam mine tailing of the selected operation of flotation returns roughing flotation operation, the selected operation of flotation concentrate as final essence
Ore deposit, the final concentrate grade of the selected operation of its flotation is 65%, the response rate up to more than 73%；
B) systemic circulation described in is returned mine and three is swept system job and be:
The foam mine tailing of roughing flotation operation feeds flotation once purging selection, and the foam mine tailing of flotation once purging selection feeds flotation
Secondary scan, the secondary foam mine tailing scanned of flotation feeds flotation and scans for three times, the underflow concentrate of flotation once purging selection, flotation two
The secondary underflow concentrate scanned all returns roughing flotation operation, and the underflow concentrate that flotation is scanned for three times returns flotation once purging selection and makees
Industry, formed systemic circulation return mine, the grade that flotation is scanned for three times be 14%, the response rate be 15% foam mine tailing and grade be 9.5%,
The response rate merges into true tailings for 9% 1 section strong magnetic tail ore deposit, and the Iron grade of its true tailings is 12%, and iron recovery is 24%.
The strong magnetic operation of described one section adopts horizontal disk high gradient intensity magnetic separator, and its field intensity is 1.6t.
Described roughing flotation operation and the selected operation of flotation adopt self-suction type flotation machine, and flotation is scanned and adopted inflated type
Flotation device.
Described microfine red magnetic mixing iron mine includes quartz type primary ore, quartz type oxide ore, quartz type speculum iron, stone
English type spiegel time lean ore, quartz type (magnetic) bloodstone, amphibole type oxide ore or Conglomerate Type iron mine.
The invention has the advantage that
1) adopt the technological process of the present invention, can obtain Iron grade is 65%, the iron ore concentrate of iron recovery more than 73%, and this is right
In the mixing iron mine based on bloodstone, it is extraordinary product index.
2) the technological process high intensity magnetic separation of the present invention adopts Horizontal ring high intensity magnetic separator, and Horizontal ring high intensity magnetic separator is High gradient high intensity magnetic separation
Machine, field intensity 1.6t, field intensity is far above Verticle ring high intensity magnetic separator, is conducive to reclaiming fine-particle minerals, so that strong magnetic tailings grade is reduced to
9.5%,.
3) technological process of the present invention carries out weak magnetic-high intensity magnetic separation using after one section of ball milling, and grinding particle size is p80=65 micron,
Effectively prevent overground it is ensured that the effect of magnetic separation；Directly carry out anion reverse floatation, grinding particle size is after two-stage nitration ball milling
P80=25-30 micron, sufficiently make use of the advantage that reverse flotation is good to microfine iron mine sorting result, optimizes final further
Sorting index is it is ensured that the high-recovery of iron ore concentrate.
4) technological process of the present invention, in rough floatation, cleaner flotation operation, employs self-suction type flotation machine, and scans with filling
The equipment combination of gas formula flotation device.This equipment combination not only sufficiently make use of self-suction type flotation machine foam stroke short, absorption
Thing feature difficult for drop-off it is ensured that the grade of reverse flotation underflow concentrate, and make use of pneumatic flotation cell foam stroke length,
The relatively caducous feature of adsorbate, reduces the iron recovery of reverse flotation foam mine tailing.
5) the technique flotation of the present invention is scanned and is returned technique using great-leap-forward underflow, and the underflow concentrate that three times are scanned returns floating
Select once purging selection, flotation is secondary to scan and all return roughing flotation with the underflow concentrate of flotation once purging selection.Decrease flotation to scan
Number of times (the reverse flotation feeding granularity of general p80=25-30 micron needs to scan to ensure the response rate for four times), decreases flotation device
The quantity of equipment, simplifies flotation flowsheet, reduces flotation investment.
Brief description
Fig. 1 is the flowage structure figure of the present invention.
Specific embodiment
Further illustrate the specific embodiment of the present invention below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of microfine red magnetic mixing iron mine sorting process of the present invention is it is characterised in that include stage mill
Ore deposit-classification-weak magnetic-strong magnetic-anion reverse floatation operation, specifically comprises the following steps that
1) by granularity after coarse crushing be p80=150mm, grade be 30%-32% microfine red magnetic mixing iron mine feed Semi-Autogenous
Equipment carries out ore grinding, and the ore discharge of Semi-Autogenous equipment feeds vibrosieve and sieved, and under sieving after screening, < product of 12mm feeds one
The closed circuit ball grinder graded operation of section, oversize returns Semi-Autogenous equipment and is regrinded；
2) granularity of one section of closed circuit ball grinder graded operation reaches p80=65 μm of overflow product and feeds one section of weak magnetic operation, product
Position is 26%, and after the concentrated machine of one section of weakly magnetic tailings of the response rate 68% concentrates, thickener underflow product feeds one section strong magnetic operation,
Thickener overflow feeds recirculated water, and grade is 53%, the response rate be 32% one section of inferior fine magnetite concentrate and grade be 36%, the response rate is
The closed circuit ball grinder graded operation of two-stage nitration is fed, one section strong described magnetic operation adopts flat ring high after 59% one section of high intensity magnetic mineral mixing
Gradient strong magnetic selects machine, and its field intensity is 1.6t；
3) two-stage nitration ball milling and the sand setting return closed circuit ball grinder graded operating system of two-stage nitration after classification are regrinded, and two-stage nitration is closed circuit
The granularity of ball grinder graded operation is that the overflow product of p80=25-30 micron feeds concentration operation before flotation；Concentration is 30%, granularity
Underflow product for the thickener of p80=25-30 micron feeds anion reverse floatation operating system, and the overflow of thickener feeds and follows
Ring water,
The technological process high intensity magnetic separation of the present invention adopts Horizontal ring high intensity magnetic separator, and Horizontal ring high intensity magnetic separator is High gradient high intensity magnetic separator,
Field intensity 1.6t, field intensity is far above Verticle ring high intensity magnetic separator, is conducive to reclaiming fine-particle minerals, makes strong magnetic tailings grade be reduced to 9.5%.
Carry out weak magnetic-high intensity magnetic separation using after one section of ball milling, grinding particle size is p80=65 micron, effective prevent overground,
Ensure that the effect of magnetic separation；Directly carry out anion reverse floatation, grinding particle size is p80=25-30 micron, fully after two-stage nitration ball milling
Make use of the reverse flotation advantage good to microfine iron mine sorting result, optimize final sorting index further it is ensured that ferrum
The high-recovery of concentrate.
4) anion reverse floatation described in is returned mine using a thick, essence and systemic circulation and three is swept system job, and concrete steps are such as
Under:
A) by concentration be 30%, granularity be p80=25-30 micron thickener underflow product feed roughing flotation operation, float
Choosing is roughly selected and adds silicate collecting agent " ra715 " 500g/t to do ore deposit in operation, and ph regulator " naoh " 600g/t does ore deposit, iron mineral
Inhibitor corn starch 630g/t does ore deposit, and silicic acid salt activator " cao " 280g/t does ore deposit, and the underflow concentrate of roughing flotation operation is given
Enter the selected operation of flotation, the foam mine tailing of roughing flotation operation feeds scans operation, the selected operation of flotation adds silicate
Collecting agent " ra715 " 160g/t does ore deposit, and silicic acid salt activator " cao " 140g/t does ore deposit, and the foam mine tailing of the selected operation of flotation returns
Return roughing flotation operation, the concentrate of the selected operation of flotation is final concentrate, and the final concentrate grade of the selected operation of its flotation is
65%, the response rate up to more than 73%；
Roughing flotation operation of the present invention and the selected operation of flotation adopt self-suction type flotation machine, this self suction type floatation
Machine not only sufficiently make use of the feature that self-suction type flotation machine foam stroke is short, adsorbate is difficult for drop-off it is ensured that reverse flotation bottom
The grade of stream concentrate, and make use of pneumatic flotation cell foam stroke length, the relatively caducous feature of adsorbate, reduce
The iron recovery of reverse flotation foam mine tailing.
B) systemic circulation described in is returned mine and three is swept system job and adopt pneumatic flotation cell:
The foam mine tailing of roughing flotation operation feeds flotation once purging selection, and the foam mine tailing of flotation once purging selection feeds flotation
Secondary scan, the secondary foam mine tailing scanned of flotation feeds flotation and scans for three times, the underflow concentrate of flotation once purging selection, flotation two
The secondary underflow concentrate scanned all returns roughing flotation operation, and the underflow concentrate that flotation is scanned for three times returns flotation once purging selection and makees
Industry, formed systemic circulation return mine, the grade that flotation is scanned for three times be 14%, the response rate be 15% foam mine tailing and grade be 9.5%,
The response rate merges into true tailings for 9% 1 section strong magnetic tail ore deposit, and the Iron grade of its true tailings is 12%, and iron recovery is 24%.
The process selection of the present invention is in sorting quartz type primary ore, quartz type oxide ore, quartz type speculum iron, quartz type mirror
Ferrum time lean ore, quartz type (magnetic) bloodstone, amphibole type oxide ore or Conglomerate Type iron mine.
The technique flotation of the present invention is scanned and is returned technique using great-leap-forward underflow, and the underflow concentrate that three times are scanned returns flotation
Once purging selection, flotation is secondary to scan and all returns roughing flotation with the underflow concentrate of flotation once purging selection.Decrease flotation to scan time
Number (the reverse flotation feeding granularity of general p80=25-30 micron needs to scan to ensure the response rate for four times), decreases flotation device and sets
Standby quantity, simplifies flotation flowsheet, reduces flotation investment.
Claims (4)
1. a kind of microfine red magnetic mixing iron mine sorting process it is characterised in that include the magnetic of stage grinding-classification-weak magnetic-by force-
Anion reverse floatation operation, specifically comprises the following steps that
1) by granularity after coarse crushing be p80=150mm, grade be 30%-32% microfine red magnetic mixing iron mine feed Semi-Autogenous equipment
Carry out ore grinding, the ore discharge of Semi-Autogenous equipment feeds vibrosieve and sieved, after screening sieve under < product of 12mm feed one section closed circuit
Ball grinder graded operation, oversize returns Semi-Autogenous equipment and is regrinded；
2) granularity of one section of closed circuit ball grinder graded operation reaches p80=65 μm of overflow product and feeds one section of weak magnetic operation, and grade is
26%, after the concentrated machine of one section of weakly magnetic tailings of the response rate 68% concentrates, thickener underflow product feeds one section strong magnetic operation, concentrates
Machine overflow feeds recirculated water, grade be 53%, the response rate be 32% one section of inferior fine magnetite concentrate and grade be 36%, the response rate is 59%
The closed circuit ball grinder graded operation of two-stage nitration is fed after one section of high intensity magnetic mineral mixing；
3) two-stage nitration ball milling and the sand setting return closed circuit ball grinder graded operating system of two-stage nitration after classification are regrinded, the closed circuit ball milling of two-stage nitration
The granularity of graded operation is that the overflow product of p80=25-30 micron feeds concentration operation before flotation；Concentration is 30%, and granularity is p80
The underflow product of the thickener of=25-30 micron feeds anion reverse floatation operating system, and the overflow of thickener feeds recirculated water,
4) anion reverse floatation described in is returned mine using a thick, essence and systemic circulation and three is swept operating system, specifically comprises the following steps that
A) by concentration be 30%, granularity be p80=25-30 micron thickener underflow product feed roughing flotation operation, flotation is thick
The underflow concentrate being elected to be industry feeds the selected operation of flotation, and the foam mine tailing of roughing flotation operation feeds scans operation,
B) the foam mine tailing of the selected operation of flotation returns roughing flotation operation, and the concentrate of the selected operation of flotation is final concentrate,
The final concentrate grade of the selected operation of its flotation is 65%, the response rate up to more than 73%；
C) systemic circulation described in is returned mine and three is swept operating system and be:
The foam mine tailing of roughing flotation operation feeds flotation once purging selection, and it is secondary that the foam mine tailing of flotation once purging selection feeds flotation
Scan, the secondary foam mine tailing scanned of flotation feeds flotation and scans for three times, the underflow concentrate of flotation once purging selection, and flotation is secondary to sweep
The underflow concentrate of choosing all returns roughing flotation operation, and the underflow concentrate that flotation is scanned for three times returns flotation once purging selection operation, shape
Become systemic circulation return mine, the grade that flotation is scanned for three times be 14%, the response rate be 15% foam mine tailing and grade be 9.5%, the response rate
Merge into true tailings for 9% 1 section strong magnetic tail ore deposit, the Iron grade of its true tailings is 12%, and iron recovery is 24%.
2. microfine according to claim 1 red magnetic mixing iron mine sorting process it is characterised in that
The strong magnetic operation of described one section adopts horizontal disk high gradient intensity magnetic separator, and its field intensity is 1.6t.
3. microfine according to claim 1 red magnetic mixing iron mine sorting process is it is characterised in that described roughing flotation
Operation and the selected operation of flotation adopt self-suction type flotation machine, and flotation is scanned and adopted pneumatic flotation cell.
4. microfine according to claim 1 red magnetic mixing iron mine sorting process is it is characterised in that described microfine is red
Magnetic mixing iron mine includes quartz type primary ore, quartz type oxide ore, quartz type speculum iron, quartz type spiegel time lean ore, quartz type
Bloodstone, quartz type magnetic iron ore, amphibole type oxide ore or Conglomerate Type iron mine.
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| CN105540799A (en) * | 2016-01-26 | 2016-05-04 | 太原钢铁(集团)有限公司 | Method for improving quality of red ore back water |
| CN106076606B (en) * | 2016-08-10 | 2018-06-01 | 中钢集团马鞍山矿山研究院有限公司 | A kind of beneficiation method of magnetic-red Complex iron ore |
| CN106824507A (en) * | 2016-12-19 | 2017-06-13 | 东北大学 | The method for separating that a kind of floating stage agent addition reinforcing particulate weak magnetic iron mineral of magnetic is reclaimed |
| CN107321472A (en) * | 2017-07-06 | 2017-11-07 | 中国矿业大学(北京) | A kind of crystalline flake graphite method for separating based on pneumatic separation and flotation |
| CN107335535B (en) * | 2017-08-30 | 2020-02-14 | 玉溪大红山矿业有限公司 | Efficient beneficiation method for low-grade refractory titanomagnetite |
| CN107790283B (en) * | 2017-10-19 | 2019-10-11 | 中冶北方（大连）工程技术有限公司 | A kind of amphibole type proto culture sorting process |
| CN108993757A (en) * | 2018-07-05 | 2018-12-14 | 鞍钢集团矿业有限公司 | Semi-Autogenous pre-selection-the stage grinding of magnetic iron ore-dusting cover tower grinds magnetic separation process |
| CN108580043B (en) * | 2018-08-01 | 2019-10-11 | 中冶北方（大连）工程技术有限公司 | A kind of ore-dressing technique of high alferric mine |
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| 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 |
| CN112642577B (en) * | 2020-12-15 | 2022-08-12 | 中冶北方（大连）工程技术有限公司 | Mineral processing technology for processing ultrafine magnetite with embedded granularity |
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| UA82265C2 (en) * | 2006-05-03 | 2008-03-25 | Открытое Акционерное Общество Научно-Исследовательский И Проектный Институт По Обогащению И Агломерации Руд Черных Металлов | Method of combined benefication of complex titaniferous ores |
| CN101708481B (en) * | 2008-10-31 | 2012-09-12 | 鞍钢集团矿业公司 | Additional grading technology for spiral chute roughing tailings |
| CN102019228B (en) * | 2009-09-18 | 2012-09-12 | 鞍钢集团矿业公司 | Ultra-lean hematite dressing process |
| CN102078839A (en) * | 2010-12-06 | 2011-06-01 | 河北钢铁集团矿业有限公司 | Method for sorting first-section grind grading overflow in laterite dressing |
| CN102441481B (en) * | 2011-09-19 | 2013-08-07 | 鞍钢集团矿业公司 | Mineral separation process for magnetic hematite rough concentrates |
| CN102872973B (en) * | 2012-09-29 | 2015-06-10 | 河北联合大学 | High-mud micro-fine particle lean hematite separation process |
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