CN101850295B - 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 PDFInfo
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- CN101850295B CN101850295B CN 201010177556 CN201010177556A CN101850295B CN 101850295 B CN101850295 B CN 101850295B CN 201010177556 CN201010177556 CN 201010177556 CN 201010177556 A CN201010177556 A CN 201010177556A CN 101850295 B CN101850295 B CN 101850295B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 168
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 84
- 239000012141 concentrate Substances 0.000 title claims abstract description 82
- 238000004519 manufacturing process Methods 0.000 title abstract description 3
- 238000005188 flotation Methods 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 55
- 238000007885 magnetic separation Methods 0.000 claims abstract description 45
- 239000003795 chemical substances by application Substances 0.000 claims description 68
- 150000001450 anions Chemical class 0.000 claims description 27
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000000227 grinding Methods 0.000 claims description 16
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 claims description 10
- 239000003002 pH adjusting agent Substances 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 7
- 239000003112 inhibitor Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000012190 activator Substances 0.000 claims description 5
- 229920002261 Corn starch Polymers 0.000 claims description 4
- 239000008120 corn starch Substances 0.000 claims description 4
- 229940099112 cornstarch Drugs 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 238000013467 fragmentation Methods 0.000 claims description 2
- 238000006062 fragmentation reaction Methods 0.000 claims description 2
- 239000000344 soap Substances 0.000 claims description 2
- 239000003814 drug Substances 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 6
- 229910001608 iron mineral Inorganic materials 0.000 abstract description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract description 5
- 229920002472 Starch Polymers 0.000 abstract description 4
- 239000008107 starch Substances 0.000 abstract description 4
- 235000019698 starch Nutrition 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000011019 hematite Substances 0.000 abstract description 2
- 229910052595 hematite Inorganic materials 0.000 abstract description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 abstract 7
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 238000012216 screening Methods 0.000 description 5
- 239000010453 quartz Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 239000006148 magnetic separator Substances 0.000 description 3
- 229910052891 actinolite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052888 grunerite Inorganic materials 0.000 description 2
- 229910052892 hornblende Inorganic materials 0.000 description 2
- WMSLVFFFKYWWSG-UHFFFAOYSA-N iron silicic acid Chemical compound [Fe].O[Si](O)(O)O WMSLVFFFKYWWSG-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910052889 tremolite Inorganic materials 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 208000001840 Dandruff Diseases 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229910052951 chalcopyrite Inorganic materials 0.000 description 1
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- -1 ether amine Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052655 plagioclase feldspar Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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 process, and the ratio that the hematite of complicated difficult choosing accounts for is large, 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 technique of stage low intensity magnetic separation that adopts single low intensity magnetic separation at present, when part gangue mineral disseminated grain size is thicker, can in the corase grind stage, throw and remove the gangue of monomer dissociation, for energy-saving and production-increase creates good conditions.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, such as low intensity magnetic separation picking equipments such as column magnetic separators.
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 primary mill, type fine disintegrating machine, dry separation screening machine, storage bin, ball mill, depiler, magnetic separator, high-frequency screen, filter, between storage bin and depiler, set up a cover wet type and roughly select unit, comprise the conveyer belt, rescreener, wet type type fine disintegrating machine, wet screening machine and the wet type coarse classifier that connect successively.Compare with the existing technology and equipment of same size, sort equal low-grade iron ore, under the condition of same power consumption, output can improve 1-2 doubly, thereby takes full advantage 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 impurity content is high, is not suitable for the requirement of metallurgical industry fine fodder policy and energy-conserving and environment-protective.
To the poor magnetic iron ore of fine-grained disseminated grain, adopt combined process flow, present domestic and international 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 good resistance to low temperature, 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 obvious deficiency in cation-collecting agent lauryl amine commonly used: foam volume is large in the floatation process, viscosity is high and froth breaking is difficult, poor fluidity, causes the subsequent operation difficulty large; The lauryl amine poor selectivity, the sorting mineral effect is greatly affected.
Ore-dressing technique two adopts anion collecting agent reverse flotation, the anion collecting agent has selective strong characteristics, 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 by a plurality of variablees during the course the control of flotation operation.Increasing of medicament kind is so 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 large, and ore pulp will heat to about 30 ℃, and this has also increased in the situation of operating cost, particularly north of china in winter, and energy consumption consumption is very high.In addition, use starch as the inhibitor of iron mineral, it is difficult also to have caused concentrate to filter, and has brought very large difficulty to subsequent job.
Summary of the invention
Purpose of the present invention is exactly for the defects that exists on the prior art, provides a kind of and do not reduce concentrate grade and the rate of recovery, is conducive to 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 technique, 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) the cation-collecting agent reverse floatation process is adopted in the magnetic concentrate of above-mentioned TFe62%-66%, obtain 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 to the ore deposit):
The cation-collecting agent reverse flotation only uses a kind of amine collector of collecting agent, such 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.
It is that PH adjusting agent, cornstarch are that inhibitor, lime are activator that the roughly selecting of anion collecting agent reverse flotation adopted NaOH, and collecting agent adopts soap or modified fat hydrochlorate; Described PH adjusting agent consumption is 500～1500g/t, and the inhibitor consumption is that 500～1500g/t, activator level are 100～600g/t, and collector dosage is 100～600g/t.
100～300g/t PH adjusting agent, 100～300g/t collecting agent are added in the anti-floating selected operation of anion again, anti-floatingly scan operation and add 100～300g/t PH adjusting agent again.
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 properties, 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, the qualified mine tailing of can dishing out in advance, the follow-up ore grinding of decrease, ore dressing amount, energy efficient for low-grade magnetite.
2. at first adopt the cation-collecting agent reverse flotation can obtain most of qualified iron ore concentrate to the magnetic concentrate of the TFe62%-66% that obtains, 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 greatly 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 to cation-collecting agent reverse flotation chats, can greatly reduce the flotation tailing grade, 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 greatly saved the energy resource consumption that flotation pulp is heated.
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, below in conjunction with accompanying drawing, 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.
Take domestic certain magnetite separation as example, 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%, secondly is the tremolite, actinolite, hornblende and a small amount of grunerite, chlorite, mica, plagioclase and calcite etc.
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, useless 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 technique, 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, ball mill ore discharging 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 except qualified tailings; One stages of magnetic separation rough concentrate feeds hydroclone classification again through hydrocyclone pre-classification, hydrocyclone sand 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 ore grinding-hierarchical composition technique obtains of hydrocyclone and three sections ore grindings 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 larger, if direct marketing, consumers' opinions is larger.
(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.Be qualified cation-collecting agent reverse flotation iron concentrate in the reverse flotation groove, roughly selecting with selected foam is 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 adjusting 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 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 made into 20% concentration and uses as the PH adjusting agent.
In actual applications, the anti-floating number of times of scanning can require to increase and decrease according to processing ore situation, Iron Concentrate Quality; Flotation chats echo plex mode also can be according to returning in the processing ore situation choice set or sequentially returning.
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 anionic-cationic substep reverse flotation of cation-collecting agent reverse flotation, anion collecting agent reverse flotation.
Claims (2)
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 technique, 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) the cation-collecting agent reverse floatation process is adopted in the magnetic concentrate of above-mentioned TFe62%-66%, obtain 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, and anion collecting agent reverse flotation adopts one roughing, primary cleaning and scans for two to three times;
It is collecting agent that described cation-collecting agent reverse flotation adopts lauryl amine, and roughly selecting the lauryl amine consumption is 30～80g/t, and selected lauryl amine consumption is 10～30g/t, and dosing is to the ore deposit, by doing ore deposit amount calculating to flotation;
It is that PH adjusting agent, cornstarch are that inhibitor, lime are activator that the roughly selecting of anion collecting agent reverse flotation adopted NaOH, and collecting agent adopts soap or modified fat hydrochlorate; Described each dosing be to flotation to the ore deposit, calculate by doing the ore deposit amount: PH adjusting agent consumption is 500～1500g/t, and the inhibitor consumption is that 500～1500g/t, activator level are 100～600g/t, and collector dosage is 100～600g/t; 100～300g/tPH adjusting agent, 100～300g/t collecting agent are added in the anti-floating selected operation of anion again, anti-floatingly scan operation and add 100～300g/t PH adjusting agent again.
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 is characterized in that: described pre-classification employing 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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