CN101850295A - Beneficiation method for producing high-quality iron ore concentrate by low-grade magnetic iron ore - Google Patents

Beneficiation method for producing high-quality iron ore concentrate by low-grade magnetic iron ore Download PDF

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CN101850295A
CN101850295A CN201010177556A CN201010177556A CN101850295A CN 101850295 A CN101850295 A CN 101850295A CN 201010177556 A CN201010177556 A CN 201010177556A CN 201010177556 A CN201010177556 A CN 201010177556A CN 101850295 A CN101850295 A CN 101850295A
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concentrate
iron ore
ore
collecting agent
reverse flotation
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CN101850295B (en
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胡义明
张永
刘军
皇甫明柱
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MAANSHAN Mine Research Institute Co.,Ltd.
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Sinosteel Maanshan Institute of Mining Research Co Ltd
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Abstract

The invention discloses a beneficiation method for producing high-quality iron ore concentrate by low-grade magnetic iron ore, which comprises the following steps that a stage grinding-stage magnetic separation discarding tailing beneficiation process is adopted to produce magnetic separation ore concentrate with the iron ore concentrate grade TFe of 62-66 %; a positive ion collector reverse flotation process is adopted on the magnetic separation ore concentrate to obtain positive ion collector reverse flotation iron ore concentrate and middling; a negative ion collector reverse flotation process is adopted on the middling obtained by positive ion collector reverse flotation to obtain negative ion collector reverse flotation iron ore concentrate; and the positive ion collector reverse flotation iron ore concentrate and the negative ion collector reverse flotation iron ore concentrate are combined to obtain the ultimate high-quality iron ore concentrate. The invention has the advantages of high grade of iron ore concentrate, high iron recovery rate, small loss of fine iron minerals, low beneficiation energy consumption and small consumption of medicaments, can relieve the industry difficulty of difficult filtration caused by adding starch into fine concentrate, greatly optimizes concentrate filtration operation, can be used for the sorting of magnetite ore, and can also be used for the sorting of weakly magnetic iron minerals such as hematite and the like.

Description

A kind of beneficiation method of producing high-quality iron ore concentrate by low-grade magnetic iron ore
Technical field
The present invention relates to a kind of beneficiation method of iron ore, specifically relate to a kind of beneficiation method of producing high-quality iron ore concentrate by low-grade magnetic iron ore, be applicable to sorting of quartz type magnetic iron ore, be specially adapted to the sorting of the poor magnetic iron ore of quartz type of fine-grained disseminated grain, to produce high-quality iron ore concentrate.
Background technology
The main feature of China's iron ore is " poor ", " carefully ", " mixing ", and average iron grade 32% is than low 11 percentage points of world average grade.Wherein 97% iron ore needs ore dressing to handle, and the ratio that the hematite of complicated difficult choosing accounts for is big, accounts for 20.8% of iron ore reserves.
The magnetic iron ore ore dressing is the main body of iron ore dressing always, in China's iron ore concentrate output, mainly is magnetite concentrate.The magnetite separation technology mainly contains stage grinding---the other technology of stage low intensity magnetic separation that adopts single low intensity magnetic separation at present, when part gangue mineral disseminated grain size is thick, can throw and remove the gangue of monomer dissociation, for energy-saving and production-increase creates good conditions in the corase grind stage.Coarse concentrate regrinding can be saved hypomere ore mill volume greatly.To the fine-grained disseminated grain magnetic iron ore, adopt multistage grinding, repeatedly sort, in this flow process, introduce the dusting cover regrinding process, can under thicker grinding particle size condition, tell the high-grade iron ore concentrate of part, further reduce the ore deposit amount of regrinding of rough concentrate, prevent that the high-grade concentrate is overground, reduce metal loss.In order to improve iron concentrate grade, the low intensity magnetic separation picking equipment has been adopted in the ore dressing plant that has, as low intensity magnetic separation picking equipments such as magnetic separation posts.
Chinese patent CN101130177 discloses a kind of iron ore of low ore grade ore-dressing technique and preparation equipment thereof, its ore-dressing technique comprises coarse crushing, fine crushing, dry separation screening, ball milling, depiler sub-material, magnetic separation, a high frequency screening, filters, following step is arranged: the mineral aggregate regrading, the rough secondary fine crushing that carries out that sieves out, fines carries out wet type and roughly selects, the fines of selecting is sent into the depiler sub-material, carries out magnetic separation, high frequency screening again, filters.Preparation equipment comprises coarse crushing machine, fine crushing machine, dry separation screening machine, storage bin, ball mill, depiler, magnetic separator, high frequency sieve, filter, between storage bin and depiler, set up a cover wet type and roughly select unit, comprise the conveyer belt, rescreener, wet type fine crushing machine, wet screening machine and the wet type coarse classifier that connect successively.Compare with equipment with the existing technology of equal scale, sort equal low-grade iron ore, under the condition of same power consumption, output can improve 1-2 doubly, thereby makes full use of the iron ore of low ore grade resource.But this ore-dressing technique and equipment are not suitable for the ore dressing of the poor magnetic iron ore of quartz type of fine-grained disseminated grain, and the rate of recovery of iron is low in the iron ore concentrate, is generally less than 70%, iron concentrate grade is low, TFe is less than 64%, and the impurity content height is not suitable for metallurgical industry fine fodder policy and energy conservation and environment protection.
To the poor magnetic iron ore of fine-grained disseminated grain, adopt combined process flow, both at home and abroad at present low intensity magnetic separation---reverse flotation flowsheets that adopt with low intensity magnetic separation a large amount of mine tailings of dishing out, further improve concentrate iron grade to magnetic concentrate with reverse flotation more.Main technique has:
Ore-dressing technique one: stage grinding-stage low intensity magnetic separation-cation-collecting agent reverse flotation;
Ore-dressing technique two: stage grinding-stage low intensity magnetic separation-anion collecting agent reverse flotation.
Ore-dressing technique one adopts the advantage of cation-collecting agent reverse flotation to have: the first, and cation-collecting agent reverse floatation agent system is simple, only uses cation-collecting agent just can realize the purpose of desiliconization; The second, cation-collecting agent has the good low-temperature resistance performance, can realize industrial production about 10 ℃; Obviously, adopt the cation-collecting agent reverse floatation process can save the writing expense of heating, reduce production costs.
But also there is tangible deficiency in cation-collecting agent lauryl amine commonly used: foam volume is big in the floatation process, viscosity is high and froth breaking is difficult, the flowability is poor, causes the subsequent operation difficulty big; The lauryl amine poor selectivity, the sorting mineral effect is subjected to very big influence.
Ore-dressing technique two adopts anion collecting agent reverse flotation, the anion collecting agent has the strong characteristics of selectivity, and in anion collecting agent reverse flotation work, four kinds of medicaments such as total NaOH, starch, calcium oxide, collecting agent are had an effect in ore pulp, medicament kind is many, can realize the control of flotation operation during the course by a plurality of variablees.Increasing of medicament kind makes that the specific aim of floatation process is stronger.
But anion collecting agent reverse floatation process pharmacy variety is many, regime of agent is complicated, consumption is big, and ore pulp will heat to about 30 ℃, and this has also increased under the situation of operating cost, particularly north of china in winter, and energy consumption consumption is very high.In addition, use the inhibitor of starch as iron mineral, it is difficult also to have caused concentrate to filter, and has brought very big difficulty to subsequent job.
Summary of the invention
Purpose of the present invention is exactly at the above-mentioned defective that exists on the prior art, provides a kind of and do not reduce the concentrate grade and the rate of recovery, helps the beneficiation method of the producing high-quality iron ore concentrate by low-grade magnetic iron ore that concentrate filters.
For realizing the present invention's purpose, the beneficiation method of a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore of the present invention is achieved through the following technical solutions.
The beneficiation method of a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore of the present invention comprises following technology, step:
(1) to the process of the raw iron ores after fragmentation primary grinding-classification-section weak magnetic separation process, obtain one section low intensity magnetic separation rough concentrate, and the mine tailing of dishing out;
A section low intensity magnetic separation gets two sections low intensity magnetic separation rough concentrates to (2) one sections low intensity magnetic separation rough concentrates through pre-classification-secondary grinding-two, and the mine tailing of dishing out;
(3) two sections low intensity magnetic separation rough concentrates through pre-classification-three section ore grinding-three a section low intensity magnetic separation roughly select, four sections low intensity magnetic separations selected the TFe62%-66% magnetic concentrate, and the mine tailing of dishing out;
(4) magnetic concentrate to above-mentioned TFe62%-66% adopts the cation-collecting agent reverse floatation process, obtains cation-collecting agent reverse flotation iron concentrate and chats;
(5) chats that the cation-collecting agent reverse flotation is obtained adopts anion collecting agent reverse floatation process, obtains anion collecting agent reverse flotation iron concentrate, and discharges mine tailing;
(6) cation-collecting agent reverse flotation iron concentrate, anion collecting agent reverse flotation iron concentrate merge the final high-quality iron ore concentrate of acquisition.
Described cation-collecting agent reverse flotation adopts one roughing, primary cleaning to be advisable, and anion collecting agent reverse flotation adopts one roughing, primary cleaning and scans for two to three times and be advisable.
The regime of agent of above-mentioned flotation operation is (all additive amount of medicament are the dried ore deposit amount meter of flotation being given the ore deposit):
The cation-collecting agent reverse flotation only uses a kind of amine collector of collecting agent, as a kind of medicament of employing lauryl amine, or a kind of medicament of ether amine.Roughly selecting the lauryl amine consumption is 30~80g/t, and selected lauryl amine consumption is 10~30g/t.
The employing NaOH of roughly selecting of anion collecting agent reverse flotation is that PH adjusts agent, cornstarch is that inhibitor, lime are activator, and collecting agent adopts soap or modified fat hydrochlorate; It is 500~1500g/t that described PH adjusts the agent consumption, and the inhibitor consumption is that 500~1500g/t, activator level are 100~600g/t, and collector dosage is 100~600g/t.
The anti-floating selected operation of anion is added 100~300g/t PH again and is adjusted agent, 100~300g/t collecting agent, anti-floatingly scans operation and adds 100~300g/t PH again and adjust agent.
It is good that described pre-classification adopts cyclone, high frequency fine screen group technology;
Above-mentioned one section magnetic induction intensity scope to four sections low intensity magnetic separations is that 0.1~0.25 tesla is advisable.
Above-mentioned dosing, magnetic induction intensity, the isoparametric occurrence of grinding particle size all can be according to ore character, and the chamber experimental result is determined by experiment.
The classification ore discharge granularity of described primary grinding accounts for 40%~60% for-0.076mm, and the classification ore discharge granularity of secondary grinding for the classification ore discharge granularity that-0.076mm accounts for 75%~95%, three sections ore grindings is-0.043mm75~95%.
The present invention compared with prior art has following advantage:
1. adopt stage grinding-staged magnetic separation process for discarding tailings for low-grade magnetic iron ore, the qualified mine tailing of can dishing out in advance reduces follow-up ore grinding, ore dressing amount, energy efficient significantly.
2. the magnetic concentrate to the TFe62%-66% that obtains at first adopts the cation-collecting agent reverse flotation can obtain most of qualified iron ore concentrate, and this a part of concentrate can be optimized filtration operation greatly owing to do not add starch in the operation.
3. the chats of cation-collecting agent reverse flotation generation adopts anion collecting agent reverse flotation, when obtaining the sub-fraction iron ore concentrate, can reduce the grade of true tailings, guarantees the concentrate rate of recovery.
4. the ore deposit amount that enters anion collecting agent reverse flotation work is few, can significantly reduce the medicament use amount, saves cost.
5. with background technology in ore-dressing technique one relatively owing to increased anion collecting agent reverse flotation work, can reduce the flotation tailing grade greatly to cation-collecting agent reverse flotation chats, improve the concentrate rate of recovery.
6. with background technology in ore-dressing technique two relatively, because the cation-collecting agent reverse flotation has obtained most of iron ore concentrate in advance, reduced the ore deposit amount that enters anion collecting agent reverse flotation work, therefore reduce anion collecting agent reverse floatation agent consumption, also saved the energy resource consumption that flotation pulp is heated greatly.
Description of drawings
Fig. 1 is the stage grinding of the beneficiation method of a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore of the present invention---staged magnetic separation is thrown tail ore dressing principle process chart.
Fig. 2 is the cation of the beneficiation method of a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore of the present invention---anion substep reverse flotation principle process chart.
The specific embodiment
For further describing the present invention,, for a more detailed description to the beneficiation method of a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore of the present invention below in conjunction with accompanying drawing.
With domestic certain magnetite separation is example, and its mineral composition is fairly simple, and metalliferous mineral is mainly magnetic iron ore, and content is 25~35%, is martite secondly, a small amount of limonite and micro-pyrite, chalcopyrite.Gangue mineral is mainly quartz, and content is 40~50%, is the tremolite, actinolite, hornblende and small amounts of iron amphibole, chlorite, mica, plagioclase and calcite etc. secondly.
The silicic acid iron mineral that contains in the ore has actinolite, the tremolite and a small amount of hornblende.Contain the silicic acid iron mineral high for grunerite, be distributed in grunerite-schist, off-balancesheet ore or the magnet grunerite-schist in interlayer, the country rock more.
---cation of the beneficiation method of staged magnetic separation ore dressing principle process chart, a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore of the present invention shown in Figure 2---anion substep reverse flotation principle process chart that adopts the stage grinding of the beneficiation method of a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore of the present invention shown in Figure 1, its technology, step are as follows:
(1) stage grinding---staged magnetic separation is thrown tail
Magnetic iron ore is through being crushed to-20mm, feed in one section ball mill and carry out primary grinding, the ball mill ore discharge is through the spiral classifier classification, primary grinding is returned in the sand return of spiral classifier again, the overflow of spiral classifier (granularity-0.076mm accounts for 40~60%) sorts through one section low intensity magnetic separation, obtain a stages of magnetic separation rough concentrate, throw and remove qualified tailings; One stages of magnetic separation rough concentrate feeds hydroclone classification again through hydrocyclone pre-classification, cyclone sand setting behind secondary grinding, cyclone overflow (0.076mm accounts for 75~95%) feeds two sections low intensity magnetic separations, obtains two sections low intensity magnetic separation concentrate; Two sections low intensity magnetic separation concentrate feed three sections and four sections low intensity magnetic separations through the cyclone overflow (0.043mm75~95%) that the ore grinding-hierarchical composition technology of hydrocyclone and three sections ore grindings obtains again, obtain the low intensity magnetic separation concentrate.
The Wet-type permanent magnet drum type magnetic separator is adopted in one section to four sections low intensity magnetic separation, and its magnetic induction intensity is 0.1~0.25 tesla.
Through stage grinding---staged magnetic separation process for discarding tailings flow process, the magnetic separation of iron ore concentrate grade of acquisition is 65.5 ± 0.5%, SiO 2About content 8%, and SiO 2The content fluctuation ratio is bigger, if direct marketing, consumers' opinions is bigger.
(2) magnetic separation of iron ore concentrate carries out the cation-collecting agent reverse flotation.
Magnetic separation of iron ore concentrate is fed cation-collecting agent reverse flotation tank diameter, add lauryl amine 30~80g/t, feed flotation device after the stirring, through one roughing, primary cleaning, the selected lauryl amine 10~30g/t that adds.Is qualified cation-collecting agent reverse flotation iron concentrate in the reverse flotation groove, roughly select with selected foam be that chats carries out anion collecting agent reverse flotation.
(3) cation-collecting agent reverse flotation chats carries out anion collecting agent reverse flotation.
Mine pump feeds anion collecting agent reverse flotation tank diameter in the cation-collecting agent reverse flotation, wherein add and adjust agent NaOH 500~1500g/t, inhibitor cornstarch 500~1500g/t, activator lime 200~600g/t, anion collecting agent MH (a kind of modified fat hydrochlorate, buy on the market) 100~600g/t, feed flotation device after the stirring, scan through one roughing, primary cleaning, secondary.Selected MH100~300g/t, the NaOH 100~300g/t of adding; Once purging selection hydro-oxidation sodium 100~300g/t.Product is a qualified concentrate containing in the anti-floating cleaner cell, and it is flotation tailing that secondary is scanned foam, and product returns anion collecting agent reverse flotation tank diameter in the once purging selection groove.In the present embodiment, cornstarch, is made into 3% concentration and uses again as inhibitor as flocculant after the causticization in water.NaOH is adjusted agent as PH, is made into 20% concentration and uses.
In actual applications, the anti-floating number of times of scanning can increase and decrease according to processing ore situation, iron ore concentrate quality requirement; Flotation chats echo plex mode also can be according to returning in the processing ore situation choice set or returning in proper order.
The final iron ore concentrate TFe69.2% that obtains, SiO 2Content is 3.75%, the fine quality iron concentrate powder of overall recovery 82%%.
Known to the applicant, up to the present, also in the iron ore dressing technological process, do not adopt the precedent of the cation-anion substep reverse flotation of cation-collecting agent reverse flotation, anion collecting agent reverse flotation.

Claims (5)

1. the beneficiation method of a producing high-quality iron ore concentrate by low-grade magnetic iron ore, it is characterized in that: it comprises following technology, step:
(1) to the process of the raw iron ores after fragmentation primary grinding-classification-section weak magnetic separation process, obtain one section low intensity magnetic separation rough concentrate, and the mine tailing of dishing out;
A section low intensity magnetic separation gets two sections low intensity magnetic separation rough concentrates to (2) one sections low intensity magnetic separation rough concentrates through pre-classification-secondary grinding-two, and the mine tailing of dishing out;
(3) two sections low intensity magnetic separation rough concentrates through pre-classification-three section ore grinding-three a section low intensity magnetic separation roughly select, four sections low intensity magnetic separations selected the TFe62%-66% magnetic concentrate, and the mine tailing of dishing out;
(4) magnetic concentrate to above-mentioned TFe62%-66% adopts the cation-collecting agent reverse floatation process, obtains cation-collecting agent reverse flotation iron concentrate and chats;
(5) chats that the cation-collecting agent reverse flotation is obtained adopts anion collecting agent reverse floatation process, obtains anion collecting agent reverse flotation iron concentrate, and discharges mine tailing;
(6) cation-collecting agent reverse flotation iron concentrate, anion collecting agent reverse flotation iron concentrate merge the final high-quality iron ore concentrate of acquisition.
2. the beneficiation method of a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore as claimed in claim 1, it is characterized in that: described cation-collecting agent reverse flotation adopts one roughing, primary cleaning, and anion collecting agent reverse flotation adopts one roughing, primary cleaning and scans for two to three times.
3. the beneficiation method of a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore as claimed in claim 2, it is characterized in that: it is collecting agent that described cation-collecting agent reverse flotation adopts lauryl amine, roughly selecting the lauryl amine consumption is that 30~80g/t (gives the ore deposit to flotation, doing the ore deposit amount calculates), selected lauryl amine consumption is 10~30g/t (gives the ore deposit to flotation, do the ore deposit amount and calculate).
4. the beneficiation method of a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore as claimed in claim 3, it is characterized in that: the employing NaOH of roughly selecting of anion collecting agent reverse flotation is that PH adjusts agent, cornstarch is that inhibitor, lime are activator, and collecting agent adopts soap or modified fat hydrochlorate;
Described each dosing is (give the ore deposit to flotation, do the ore deposit amount and calculate): it is 500~1500g/t that PH adjusts the agent consumption, and the inhibitor consumption is that 500~1500g/t, activator level are 100~600g/t, and collector dosage is 100~600g/t; The anti-floating selected operation of anion is added 100~300g/t PH again and is adjusted agent, 100~300g/t collecting agent, anti-floatingly scans operation and adds 100~300g/tPH again and adjust agent.
5. as the beneficiation method of claim 1,2,3 or 4 described a kind of producing high-quality iron ore concentrate by low-grade magnetic iron ore, it is characterized in that: described pre-classification adopts cyclone, high frequency fine screen group technology; Described one section magnetic induction intensity scope to four sections low intensity magnetic separations is 0.1~0.25 tesla; The classification ore discharge granularity of described primary grinding accounts for 40%~60% for-0.076mm, and the classification ore discharge granularity of secondary grinding for the classification ore discharge granularity that-0.076mm accounts for 75%~95%, three sections ore grindings is-0.043mm75~95%.
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CN102125888A (en) * 2010-11-25 2011-07-20 长沙矿冶研究院 Method for finely grinding and separating fine grain iron ore
CN102284426A (en) * 2011-07-21 2011-12-21 王辉 Sorting device and sorting method for ores
CN102430468A (en) * 2011-09-19 2012-05-02 鞍钢集团矿业公司 Magnetism-gravity combined separation technology for magnetic hematite mixed type rough concentrate
CN102489397A (en) * 2011-12-20 2012-06-13 鞍钢集团矿业公司 Dry dry crushing, grinding, grading and four-stage magnetic separation process of magnetite
CN102553707A (en) * 2012-03-17 2012-07-11 鞍钢集团矿业公司 Process for separating lean-magnetite fine ore
CN102688806A (en) * 2012-06-06 2012-09-26 鞍钢集团矿业公司 Dispersed flotation separation method for carbonate-containing iron ore
CN102778843A (en) * 2012-07-23 2012-11-14 东北大学 Operation control method of high magnetic grading process
CN102794226A (en) * 2012-08-31 2012-11-28 本溪市平山区佳鑫铁选厂 Mineral processing method of fine-particle magnetite
CN103495506A (en) * 2013-10-10 2014-01-08 鞍钢集团矿业公司 Agent for reverse flotation of iron ore and combination use method
CN104128244A (en) * 2014-07-23 2014-11-05 湖南鑫生矿冶废弃物综合利用科技有限公司 Method for recycling iron ore concentrate from iron tailings and obtained iron ore concentrate
CN104138801A (en) * 2014-07-04 2014-11-12 赣州金环磁选设备有限公司 Method for improving index of high-gradient magnetic concentrate
CN104480323A (en) * 2014-11-24 2015-04-01 灵宝金源矿业股份有限公司 Process of comprehensively recovering various metals from limonite
CN104689913A (en) * 2015-02-27 2015-06-10 铜陵化工集团新桥矿业有限公司 Pyrite mixed recycling method for polycrystal system
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CN104968437A (en) * 2013-02-05 2015-10-07 淡水河谷公司 Process to concentrate manganese ores via reverse cationic flotation of silicates
CN105728176A (en) * 2016-02-26 2016-07-06 中钢集团马鞍山矿山研究院有限公司 Beneficiation method for reducing content of SiO2 in magnetite concentrate
CN106076606A (en) * 2016-08-10 2016-11-09 中钢集团马鞍山矿山研究院有限公司 A kind of beneficiation method of the red Complex iron ore of magnetic
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CN109127122A (en) * 2018-11-14 2019-01-04 安徽工业大学 A kind of magnetite concentrate proposes the beneficiation method of Fe and reducing Si
CN109499772A (en) * 2018-12-20 2019-03-22 太原理工大学 A kind of method of pyroxene in FLOTATION SEPARATION magnetic iron ore
CN112642577A (en) * 2020-12-15 2021-04-13 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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CN102125888A (en) * 2010-11-25 2011-07-20 长沙矿冶研究院 Method for finely grinding and separating fine grain iron ore
CN102284426A (en) * 2011-07-21 2011-12-21 王辉 Sorting device and sorting method for ores
CN102284426B (en) * 2011-07-21 2013-11-06 王辉 Sorting device and sorting method for ores
CN102430468B (en) * 2011-09-19 2013-04-17 鞍钢集团矿业公司 Magnetism-gravity combined separation technology for magnetic hematite mixed type rough concentrate
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