CN103934094A - Mineral processing process of low-grade micro-fine particle embedded iron ore hard to choose - Google Patents
Mineral processing process of low-grade micro-fine particle embedded iron ore hard to choose Download PDFInfo
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Abstract
The invention discloses a mineral processing process of low-grade micro-fine particle embedded iron ore hard to choose. The process comprises the following steps that first ore grinding and staged treatment is carried out firstly, settled sand is retuned to be ground again, second ore grinding and staged treatment is carried out on overflow, the settled sand is returned to a system to be ground again, the overflow enters a weak magnetic-strong magnetic system, low intensity magnetic separation treatment is carried out firstly, strong magnetic separation is carried out on tailings after the low intensity magnetic separation many times after concentration and residue separation, rough concentrates obtained through the strong magnetic separation are combined with rough concentrates after the low intensity magnetic separation, three-stage ore grinding and staged treatment is carried out, the settled sand is returned to be ground again, selective flocculation desliming operating is carried out on the overflow many times, the low intensity magnetic separation is carried out on the deslimed settled sand to obtain weak magnetic concentrates, weak magnetic tailings are concentrated and enter in reverse flotation operating to obtain reverse flotation concentrates, and reverse flotation foam enters the weak magnetic-strong magnetic system for direct strong magnetic separation treatment. The process has the advantages of being easy, convenient and stable to operate, high in iron ore concentrate recovery rate and grade, low in cost, small in the number of adopted agents and the like.
Description
Technical field
The present invention relates to a kind of ore-dressing technique of iron ore, relate in particular to a kind of ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth iron ore.
Background technology
The fast development of Chinese national economy has in recent years pulled growing continuously and fast of China's steel and iron industry, has driven thus the sharply increase of iron ore consumption amount.Expanding economy maximally utilises the limited iron ore deposit of China in the urgent need to dependence technological progress, thereby improves the degree of self-sufficiency of domestic iron ore, reduces the degree of dependence of China's steel industry to Ore Imported.
The main feature of China's iron ore is " poor ", " carefully ", " mixing ", average iron grade only 32%, and lower approximately 11 percentage points than the average iron grade in the world, 97% iron ore iron content, below 30%, need to be processed and just can develop through ore dressing.Since two thousand one, under the remaining rich academician forever academic thought of " carrying Fe and reducing Si " instructs, successfully research and develop technological processes such as " Continuous Grinding-weak magnetic-strong magnetic-anion reverse floatation, stage grinding-weak magnetic-strong magnetic-anion reverse floatation, stage grinding-coarse and fine separation-gravity treatment-magnetic separation-anion reverse floatation, stage grinding-coarse and fine separation-magnetic separation-gravity treatment-anion reverse floatation, stage grinding-Flocculation desliming-reverse flotations " for Refractory iron ore stone, and all in industrial practice, promoted the use.
But the technological processes such as Continuous Grinding-weak magnetic-strong magnetic-anion reverse floatation, stage grinding-weak magnetic-strong magnetic-anion reverse floatation, stage grinding-coarse and fine separation-gravity treatment-magnetic separation-anion reverse floatation, stage grinding-coarse and fine separation-magnetic separation-gravity treatment-anion reverse floatation all need to throw tail by high intensity magnetic separation and reverse flotation reaching after final mog.The sorting particle diameter of intensity magnetic separator the best is 38 μ m～74 μ m at present, and granularity is thinner, and the recovering effect of strong magnetic machine is poorer.Therefore, magnetic, the bloodstone of above-mentioned mineral processing circuit to fine grain teeth cloth exists high intensity magnetic separation iron content silicates gangue mineral to enter floatation system, causes the shortcomings such as reverse flotation iron concentrate grade is low, reverse floatation agent consumption is large, tailings grade is high, iron recovery is low.
Stage grinding-Flocculation desliming-reverse floatation process flow process, taking selective flocculation to remove slime technique as core, is utilized the difference of the physicochemical properties such as ore mineral and gangue mineral surface electrical behavior, hydrophobicity, by adding NaOH, Na
2cO
3ore mineral and gangue mineral surface nature be there are differences and be suspended dispersed state Deng desliming environment, the interpolation dispersant of adjusting ore pulp, then make the surface electrical behavior of ore mineral and gangue mineral and hydrophobicity present difference by adding flocculant, realize ore mineral floc sedimentation sinking, gangue mineral suspension and remove.The Chinese patent literatures such as No. CN102784712A (ore-dressing technique of For Lower Grade Micro-fine Grain level embedding cloth refractory iron ore), No. CN102806139A (a kind of ore-dressing technique of For Lower Grade Micro-fine Grain level embedding cloth refractory iron ore), No. CN102861659A (can be used for the selective flocculation multistage desliming process of ore dressing) are all to have adopted this technological process, this technological process has not only solved the impact on flotation operation of secondary slime that primary slime and fine grinding produce well, but has equally flotation iron recovery shortcoming on the low side.Therefore, how sufficiently and reasonably to utilize the advantage of the technique such as high intensity magnetic separation, Flocculation desliming, and then research and develop more the ore-dressing technique that has practical value, more adapts to domestic iron ore feature and can further improve iron concentrate grade and iron recovery, there is positive meaning for the efficient utilization of domestic For Lower Grade Micro-fine Grain embedding cloth refractory iron ore.
Summary of the invention
The technical problem to be solved in the present invention is the deficiencies such as the ore-dressing technique concentrate iron grade for the ore properties feature of domestic and international For Lower Grade Micro-fine Grain embedding cloth refractory iron ore and existing low-grade complex refractory iron ore is low, Iron Grade of Tailings is high, concentrate iron recovery is low, proposes the ore-dressing technique of easy stable, the iron ore concentrate rate of recovery of a kind of production operation and For Lower Grade Micro-fine Grain embedding cloth refractory iron ore of high grade, cost is low, dosing is few.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore, comprises the following steps:
(1) primary grinding and classification: first carry out primary grinding and classification processing through a closed circuit grinding classification system after crushing raw ore, sand setting after primary grinding and classification returns to closed circuit grinding classification system (in one section of grinding machine) and regrinds, and the overflow after primary grinding and classification enters into next step;
(2) secondary grinding and classification: the overflow obtaining after above-mentioned steps (1) is carried out secondary grinding and classification processing through another closed circuit grinding classification system, the closed circuit grinding classification system (in Secondary grinding mill) that sand setting after secondary grinding and classification returns in this step is regrinded, and the overflow after secondary grinding and classification enters next step;
(3) weak magnetic-high intensity magnetic separation: the overflow obtaining after above-mentioned steps (2) enters weak magnetic-strong magnetic system, first carry out low intensity magnetic separation processing, mine tailing after low intensity magnetic separation is through concentrating, carry out after slag repeatedly high intensity magnetic separation processing (preferably 2～3 times), after high intensity magnetic separation, mine tailing is directly thrown useless, the rough concentrate that high intensity magnetic separation obtains merges after the rough concentrate of aforementioned low intensity magnetic separation, enters next step;
(4) three sections of ore grindings and classifications: (after the strong magnetic of the weak magnetic annihilation) rough concentrate obtaining after above-mentioned steps (3) enters another closed circuit grinding classification system and carries out three sections of ore grindings and classification processing, the closed circuit grinding classification system (in three sections of grinding machines) that sand setting after three sections of ore grindings and classification returns in this step is regrinded, and the overflow after three sections of ore grindings and classification enters next step;
(5) selective flocculation to remove slime: the overflow obtaining after above-mentioned steps (4) is through repeatedly (preferably 2～5 times) selective flocculation to remove slime operation, sand setting after selective flocculation to remove slime carries out low intensity magnetic separation and obtains inferior fine magnetite concentrate, and weakly magnetic tailings enters next step after concentrated;
(6) reverse flotation: after above-mentioned steps (5), the concentrated weakly magnetic tailings obtaining enters reverse flotation work, after reverse flotation is processed, obtain concentrate through reverse flotation, reverse flotation (sweep two or the sweep three) foam obtaining enters in the weak magnetic-strong magnetic system of above-mentioned steps (3) and directly carries out high intensity magnetic separation processing; High intensity magnetic separation is cycled to repeat above-mentioned steps (4)～step (6) after processing again successively.
The technical scheme of the invention described above is the mineral processing circuit based on " stage grinding-weak magnetic-strong strong magnetic regrinding and reconcentration of magnetic-Flocculation desliming-reverse flotation-flotation froth ", wherein, last reverse flotation work can obtain qualified iron ore concentrate completely, throwing in technological process of the present invention is given up and is realized by high intensity magnetic separation and Flocculation desliming operation, this makes, and follow-up reverse flotation work flow process is shorter, operation is more simply controlled, flotation chats internal circulating load declines and reverse floatation agent consumption reduces, complementation before and after having played, the effect cooperatively interacting.
The ore-dressing technique of above-mentioned For Lower Grade Micro-fine Grain embedding cloth refractory iron ore, preferred, in described step (1), the overflow fineness after primary grinding and classification accounts for 50%～60% for-200 orders.
The ore-dressing technique of above-mentioned For Lower Grade Micro-fine Grain embedding cloth refractory iron ore, preferred, in described step (2), the overflow fineness after secondary grinding and classification accounts for 75%～95% for-200 orders.
The ore-dressing technique of above-mentioned For Lower Grade Micro-fine Grain embedding cloth refractory iron ore, preferred, in described step (4), the overflow fineness after three sections of ore grindings and classification is-400 order >=95%.
The ore-dressing technique of above-mentioned For Lower Grade Micro-fine Grain embedding cloth refractory iron ore, preferred, after all being interconnected by each section of grinding machine and each section of hydrocyclone, the closed circuit grinding classification system that described one, two, three section of ore grinding and classification are used in processing forms.
The ore-dressing technique of above-mentioned For Lower Grade Micro-fine Grain embedding cloth refractory iron ore, preferred, in described step (3), the magnetic field intensity control of low intensity magnetic separation is 0.15T～0.30T, the magnetic field intensity control of high intensity magnetic separation is 0.8T～1.2T.
The ore-dressing technique of above-mentioned For Lower Grade Micro-fine Grain embedding cloth refractory iron ore, preferably, in described step (5), selective flocculation to remove slime selects NaOH as slurry pH adjusting agent, total consumption (repeatedly total consumption of Flocculation desliming, lower same) of NaOH is 700g～1500g/t
raw ore; Select waterglass as dispersant, the total consumption of waterglass is 500g～1000g/t
raw ore; Select starch or ammonium humate as flocculant, in the time that flocculant is starch, its total consumption is 40g～200g/t
raw ore, in the time that flocculant is ammonium humate, its total consumption is 1000～2000g/t
raw ore.The equipment that selective flocculation to remove slime adopts is preferably concentrator, dense bucket or concentrated case.According to remove sludge amount number and the height of sludge grade, desliming hop count is preferably 3～5 times, the general final productive rate that removes sludge is 15%～45%, iron grade is 8%～14%.
The ore-dressing technique of above-mentioned For Lower Grade Micro-fine Grain embedding cloth refractory iron ore, preferably, in described step (6), consider the factors such as the iron grade of final concentrate, the technological process of the technological process of " a thick essence two is swept, chats order return " or employing " a thick essence three is swept, chats order return " is processed and adopted to described reverse flotation, the iron mineral inhibitor of selecting when reverse flotation is starch, and its consumption is 100g～300g/t
raw ore; The gangue mineral collecting agent of selecting is CY-78, GE-609 or RA-915, and its consumption is 50～500g/t
raw ore; ; The temperature of reverse flotation is 25 DEG C～35 DEG C.
Compared with prior art, the invention has the advantages that:
(1) in mineral processing circuit of the present invention, first adopt high intensity magnetic separation to throw useless, throw useless amount large, it is not only simply controlled with respect to Flocculation desliming, and alleviate the accumulation of Flocculation desliming medicament in recirculated water, dependence to water quality is less than Flocculation desliming, is particularly suitable for selecting factory to lack the area of new water supply.
(2) in mineral processing circuit of the present invention, after fine grinding, adopt multistage Flocculation desliming technique, it has removed a large amount of secondary slimes that produce in fine grinding process, eliminate or reduced the impact of sludge on follow-up reverse flotation work, having solved high intensity magnetic separation iron content silicates gangue mineral and entered the technical barrier of reverse flotation systematic influence concentrate through reverse flotation quality.
(3) foam of in mineral processing circuit of the present invention, reverse flotation being swept to two (or sweeping three) uses strong magnetic to select again, high intensity magnetic mineral returns to three sections of ore grinding regrinding and reconcentrations, reverse flotation work only completes the simple function that obtains qualified iron ore concentrate, throwing gives up is completed jointly by high intensity magnetic separation and Flocculation desliming operation, this makes flotation operation flow process shorter, operate more simply controlled, flotation chats internal circulating load declines, dosing reduces, the present invention is for " stage grinding-Flocculation desliming-weak magnetic-strong magnetic-reverse flotation " technological process, final total concentrate yield can improve 2.5～5.0 percentage points, the rate of recovery improves 5.0～10.0 percentage points.
To sum up, ore-dressing technique of the present invention has positive directive significance for the ore dressing of domestic For Lower Grade Micro-fine Grain embedding cloth refractory iron ore.
Brief description of the drawings
Fig. 1 is the basic flow sheet of the ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore of the present invention.
Detailed description of the invention
For the ease of understanding the present invention, below in connection with Figure of description and preferred embodiment, the present invention is done more comprehensively, described meticulously, but protection scope of the present invention is not limited to following specific embodiment.
Unless otherwise defined, all technical terms of hereinafter using are identical with the implication that those skilled in the art understand conventionally.Technical term used herein, just in order to describe the object of specific embodiment, is not to be intended to limit the scope of the invention.
Embodiment 1:
The ore dressing plant of a certain refractory iron ore, a year treating capacity is 300,000 t/, and in district, iron in ore mineral granularity is fine, and wherein magnetic iron ore belongs to the category of particulate to particulate embedding cloth, and granularity is many between 0.01～0.03mm; Bloodstone is fine disseminated and is distributed in gangue, has the feature of microfine to atomic grain, and granularity can be to 0.04mm left and right except a few granules, and the size distribution of most of particles is between 0.002mm～0.03mm.Adopt the ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore of the present invention as shown in Figure 1, specifically comprise the following steps:
(1) primary grinding and classification: crushing raw ore first carries out primary grinding and classification processing through a closed circuit grinding classification system to <12mm, sand setting after primary grinding and classification returns to closed circuit grinding classification system and regrinds, and the overflow after primary grinding and classification enters into next step; The overflow fineness of controlling after primary grinding and classification accounts for 50% for-200 orders;
(2) secondary grinding and classification: the overflow obtaining after above-mentioned steps (1) is carried out secondary grinding and classification processing through another closed circuit grinding classification system, the closed circuit grinding classification system that sand setting after secondary grinding and classification returns in this step is regrinded, and the overflow after secondary grinding and classification enters next step; The overflow fineness of controlling after secondary grinding and classification accounts for 75% for-200 orders;
(3) weak magnetic-high intensity magnetic separation: the overflow obtaining after above-mentioned steps (2) enters weak magnetic-strong magnetic system, first carry out low intensity magnetic separation processing, the magnetic field intensity control of low intensity magnetic separation is 0.25T, mine tailing after low intensity magnetic separation is through concentrating, carry out after slag repeatedly high intensity magnetic separation processing (SLON2500 intensity magnetic separator), comprise one roughing (field intensity 1.00T) and scan (field intensity is 1.01T) for twice, after high intensity magnetic separation mine tailing directly throw useless, the mine tailing that the productive rate of can dishing out is 28.76%, iron grade is 14.36%; The rough concentrate that high intensity magnetic separation obtains merges after the rough concentrate of aforementioned low intensity magnetic separation, enters next step;
(4) three sections of ore grindings and classifications: the rough concentrate that after above-mentioned steps (3), (weak magnetic+strong magnetic) obtains enters another closed circuit grinding classification system and carries out three sections of ore grindings and classification processing, the closed circuit grinding classification system that sand setting after three sections of ore grindings and classification returns in this step is regrinded, and the overflow after three sections of ore grindings and classification enters next step; The overflow fineness of controlling after three sections of ore grindings and classification is-400 order >=95%;
(5) selective flocculation to remove slime: the overflow obtaining after above-mentioned steps (4) is through repeatedly selective flocculation to remove slime operation, specifically comprise twice Flocculation desliming and once clean desliming, wherein, the consumption of Flocculation desliming process Chinese medicine NaOH, waterglass and starch is respectively 600g/t. for the first time
raw ore, 400g/t.
raw ore, 30g/t.
raw ore, Flocculation desliming process Chinese medicine NaOH, waterglass and starch consumption are respectively 500g/t. for the second time
raw ore, 250g/t.
raw ore, 15g/t.
raw ore, cleaning for the third time after desliming, the productive rate that finally can remove sludge is 42.77%, iron content is 12.58%; Sand setting after selective flocculation to remove slime carries out low intensity magnetic separation and obtains inferior fine magnetite concentrate, and weakly magnetic tailings enters next step after concentrated;
(6) reverse flotation: the rear concentrated weakly magnetic tailings obtaining of above-mentioned steps (5) enters flotation operation and carries out reverse flotation processing, reverse flotation is processed the technological process that adopts " a thick essence two is swept, chats order return ", after reverse flotation is processed, obtains concentrate through reverse flotation; The inhibitor of the iron mineral of selecting when reverse flotation is that (consumption is 100g/t. to starch
raw ore), the collecting agent of the gangue mineral of selecting is that CY-78(consumption is 250g/t.
raw ore), reverse flotation temperature is 30 DEG C～35 DEG C;
(7) foam obtaining after above-mentioned reverse flotation enters in the weak magnetic of above-mentioned steps (3)-strong magnetic system and directly carries out high intensity magnetic separation processing, and high intensity magnetic separation is cycled to repeat above-mentioned steps (4)～step (6) after processing again successively; This step intensity magnetic separator used is step (3) strong magnetic machine used, needn't additionally add strong magnetic machine again, can save capital expenditure, and the concentrate yield finally obtaining is 28.47%, iron grade 62.84%, iron recovery 62.77%.
In addition, adopt compared with the flow process that technological process of the present invention and Gai Xuan factory produce early stage, concentrate can reduce production costs 45 yuan/t, increase income 80 yuan/t, add up to concentrate to increase by 125 yuan/t of benefit, if the annual operating rate in ore dressing plant 330 days, 8.54 ten thousand tons, year volume increase concentrate, a year benefit can reach 1067.63 ten thousand yuan.
Embodiment 2:
The ore dressing plant of a certain refractory iron ore, a year treating capacity is 2,000,000 t/, and iron in ore mineral are mainly bloodstone and magnetic iron ore, and inferior is half illusion～martite, and accidental limonite sporadicly distributes; Gangue mineral is mainly quartz, and inferior is feldspar, chlorite, sericite, actinolite and apatite.In district, in ore, magnetic iron ore belongs to the category of particulate to particulate embedding cloth, and granularity is many between 0.01mm～0.03mm, and part, at 0.04mm～0.15mm, belongs to the category of fine grain teeth cloth; Bloodstone crystal size is very tiny, and the size distribution of most of particles, between 0.002mm～0.01mm, belongs to the category of atomic fine-grained disseminated grain.Adopt the ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore of the present invention as shown in Figure 1, specifically comprise the following steps:
(1) primary grinding and classification: crushing raw ore first carries out primary grinding and classification processing through a closed circuit grinding classification system to <15mm, sand setting after primary grinding and classification returns to closed circuit grinding classification system and regrinds, and the overflow after primary grinding and classification enters into next step; The overflow fineness of controlling after primary grinding and classification accounts for 55% for-200 orders;
(2) secondary grinding and classification: the overflow obtaining after above-mentioned steps (1) is carried out secondary grinding and classification processing through another closed circuit grinding classification system, the closed circuit grinding classification system that sand setting after secondary grinding and classification returns in this step is regrinded, and the overflow after secondary grinding and classification enters next step; The overflow fineness of controlling after secondary grinding and classification accounts for 95% for-200 orders;
(3) weak magnetic-high intensity magnetic separation: the overflow obtaining after above-mentioned steps (2) enters weak magnetic-strong magnetic system, first carry out low intensity magnetic separation processing, the magnetic field intensity control of low intensity magnetic separation is 0.30T, mine tailing after low intensity magnetic separation is through concentrating, carry out after slag repeatedly high intensity magnetic separation processing (SLON2500 intensity magnetic separator), comprise one roughing (field intensity 1.00T) and once purging selection (field intensity is 1.01T), after high intensity magnetic separation mine tailing directly throw useless, the mine tailing that the productive rate of can dishing out is 30.52%, iron grade is 11.41%; The rough concentrate that high intensity magnetic separation obtains merges after the rough concentrate of aforementioned low intensity magnetic separation, enters next step;
(4) three sections of ore grindings and classifications: the rough concentrate that after above-mentioned steps (3), (weak magnetic+strong magnetic) obtains enters another closed circuit grinding classification system and carries out three sections of ore grindings and classification processing, the closed circuit grinding classification system that sand setting after three sections of ore grindings and classification returns in this step is regrinded, and the overflow after three sections of ore grindings and classification enters next step; The overflow fineness of controlling after three sections of ore grindings and classification is-400 order >=95%;
(5) selective flocculation to remove slime: the overflow obtaining after above-mentioned steps (4) is through four selective flocculation to remove slime operations, and wherein, total consumption of Flocculation desliming process Chinese medicine NaOH, waterglass and ammonium humate is respectively 1180g/t.
raw ore, 600g/t.
raw ore, 1860g/t.
raw ore, the productive rate that finally can remove sludge is 35.77%, iron content is 10.58%; Sand setting after selective flocculation to remove slime carries out low intensity magnetic separation and obtains inferior fine magnetite concentrate, and weakly magnetic tailings enters next step after concentrated;
(6) reverse flotation: the rear concentrated weakly magnetic tailings obtaining of above-mentioned steps (5) enters reverse flotation work and carries out reverse flotation processing, reverse flotation is processed the technological process that adopts " a thick essence two is swept, chats order return ", after reverse flotation is processed, obtains concentrate through reverse flotation; The inhibitor of the iron mineral of selecting when reverse flotation is that (consumption is 150g/t. to starch
raw ore), the collecting agent of the gangue mineral of selecting is that GE-609(consumption is 420g/t.
raw ore), reverse flotation temperature is 30 DEG C～35 DEG C;
(7) foam obtaining after above-mentioned reverse flotation enters in the weak magnetic of above-mentioned steps (3)-strong magnetic system and directly carries out high intensity magnetic separation processing, and high intensity magnetic separation is cycled to repeat above-mentioned steps (4)～step (6) after processing again successively; This step intensity magnetic separator used is step (3) strong magnetic machine used, needn't additionally add strong magnetic machine again, can save capital expenditure, and the concentrate yield finally obtaining is 33.71%, iron grade 62.00%, iron recovery 68.02%.
In addition, adopt compared with the flow process that technological process of the present invention and Gai Xuan factory produce early stage, concentrate yield can increase approximately 2.5 percentage points, iron recovery and improve approximately 5 percentage points.If the annual operating rate in ore dressing plant 330 days, approximately 50,000 tons, year volume increase concentrate, calculates by 800 yuan/t of iron ore concentrate price, and year increases benefit and can reach 4,000 ten thousand yuan.
Claims (7)
1. an ore-dressing technique for For Lower Grade Micro-fine Grain embedding cloth refractory iron ore, comprises the following steps:
(1) primary grinding and classification: first carry out primary grinding and classification processing through a closed circuit grinding classification system after crushing raw ore, sand setting after primary grinding and classification returns to closed circuit grinding classification system and regrinds, and the overflow after primary grinding and classification enters into next step;
(2) secondary grinding and classification: the overflow obtaining after above-mentioned steps (1) is carried out secondary grinding and classification processing through another closed circuit grinding classification system, the closed circuit grinding classification system that sand setting after secondary grinding and classification returns in this step is regrinded, and the overflow after secondary grinding and classification enters next step;
(3) weak magnetic-high intensity magnetic separation: the overflow obtaining after above-mentioned steps (2) enters weak magnetic-strong magnetic system, first carry out low intensity magnetic separation processing, mine tailing after low intensity magnetic separation is through concentrating, carry out after slag repeatedly high intensity magnetic separation processing, after high intensity magnetic separation, mine tailing is directly thrown useless, the rough concentrate that high intensity magnetic separation obtains merges after the rough concentrate of aforementioned low intensity magnetic separation, enters next step;
(4) three sections of ore grindings and classifications: the rough concentrate obtaining after above-mentioned steps (3) enters another closed circuit grinding classification system and carries out three sections of ore grindings and classification processing, the closed circuit grinding classification system that sand setting after three sections of ore grindings and classification returns in this step is regrinded, and the overflow after three sections of ore grindings and classification enters next step;
(5) selective flocculation to remove slime: the overflow obtaining after above-mentioned steps (4) is through repeatedly selective flocculation to remove slime operation, and the sand setting after selective flocculation to remove slime carries out low intensity magnetic separation and obtains inferior fine magnetite concentrate, weakly magnetic tailings enters next step after concentrated;
(6) reverse flotation: after above-mentioned steps (5), the concentrated weakly magnetic tailings obtaining enters reverse flotation work, after reverse flotation is processed, obtain concentrate through reverse flotation, the foam that reverse flotation obtains enters in the weak magnetic of above-mentioned steps (3)-strong magnetic system and directly carries out high intensity magnetic separation processing; High intensity magnetic separation is cycled to repeat above-mentioned steps (4)～step (6) after processing again successively.
2. the ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore according to claim 1, is characterized in that: in described step (1), the overflow fineness after primary grinding and classification accounts for 50%～60% for-200 orders.
3. the ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore according to claim 1, is characterized in that: in described step (2), the overflow fineness after secondary grinding and classification accounts for 75%～95% for-200 orders.
4. the ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore according to claim 1, is characterized in that: in described step (3), the magnetic field intensity control of low intensity magnetic separation is 0.15T～0.30T, and the magnetic field intensity control of high intensity magnetic separation is 0.8T～1.2T.
5. the ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore according to claim 1, is characterized in that: in described step (4), the overflow fineness after three sections of ore grindings and classification is-400 order >=95%.
6. the ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore according to claim 1, is characterized in that: in described step (5), selective flocculation to remove slime selects NaOH as slurry pH adjusting agent, and total consumption of NaOH is 700g～1500g/t
raw ore; Select waterglass as dispersant, the total consumption of waterglass is 500g～1000g/t
raw ore; Select starch or ammonium humate as flocculant, in the time that flocculant is starch, its total consumption is 40g～200g/t
raw ore, in the time that flocculant is ammonium humate, its total consumption is 1000～2000g/t
raw ore; The equipment that selective flocculation to remove slime adopts is concentrator, dense bucket or concentrated case.
7. the ore-dressing technique of For Lower Grade Micro-fine Grain embedding cloth refractory iron ore according to claim 1, it is characterized in that: in described step (6), the technological process of the technological process of " a thick essence two is swept, chats order return " or employing " a thick essence three is swept, chats order return " is processed and adopted to described reverse flotation, the iron mineral inhibitor of selecting when reverse flotation is starch, and its consumption is 100g～300g/t
raw ore; The gangue mineral collecting agent of selecting is CY-78, GE-609 or RA-915, and its consumption is 50～500g/t
raw ore; The temperature of reverse flotation is 25 DEG C～35 DEG C.
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| CN105170287A (en) * | 2015-10-19 | 2015-12-23 | 武汉科技大学 | Beneficiation method of fine dissemination magnetite |
| CN105536979A (en) * | 2015-12-16 | 2016-05-04 | 陈均宁 | Method for extracting micro-fine-particle iron ore concentrate from tailings obtained after primary iron separation |
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| CN111167611A (en) * | 2018-11-10 | 2020-05-19 | 中蓝连海设计研究院有限公司 | Reverse flotation method for continuously grinding silicon-calcium collophanite |
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| CN105170287A (en) * | 2015-10-19 | 2015-12-23 | 武汉科技大学 | Beneficiation method of fine dissemination magnetite |
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| CN107321495A (en) * | 2017-08-30 | 2017-11-07 | 玉溪大红山矿业有限公司 | A kind of beneficiation method of high efficiente callback particulate low-grade magnetite |
| CN107790283A (en) * | 2017-10-19 | 2018-03-13 | 中冶北方（大连）工程技术有限公司 | A kind of amphibole type proto culture sorting process |
| CN108355828A (en) * | 2018-02-09 | 2018-08-03 | 鞍钢集团矿业设计研究院有限公司 | The full permanent magnetism short route of Continuous Grinding handles mixed type iron ore technique |
| CN108355827A (en) * | 2018-02-09 | 2018-08-03 | 鞍钢集团矿业设计研究院有限公司 | Continuous Grinding magnetic weight flow processing mixed type iron ore technique |
| CN108283988A (en) * | 2018-02-09 | 2018-07-17 | 鞍钢集团矿业设计研究院有限公司 | Stage grinding magnetic weight flow processing mixed type iron ore technique |
| CN108283988B (en) * | 2018-02-09 | 2020-03-31 | 鞍钢集团矿业设计研究院有限公司 | Process for treating mixed iron ore by stage ore grinding magnetic-gravity flow |
| CN108993766A (en) * | 2018-07-24 | 2018-12-14 | 昆明冶金研究院 | A kind of ore dressing processing method of weathering type ilmenite |
| CN108993766B (en) * | 2018-07-24 | 2020-10-13 | 昆明冶金研究院 | Ore dressing treatment method for weathered ilmenite |
| CN109225607A (en) * | 2018-09-18 | 2019-01-18 | 湖南柿竹园有色金属有限责任公司 | A kind of method of iron ore concentrate reverse flotation |
| CN111167611A (en) * | 2018-11-10 | 2020-05-19 | 中蓝连海设计研究院有限公司 | Reverse flotation method for continuously grinding silicon-calcium collophanite |
| CN110694789A (en) * | 2019-11-18 | 2020-01-17 | 安徽马钢矿业资源集团有限公司 | Ore dressing method for magnetite |
| CN111167595A (en) * | 2019-12-30 | 2020-05-19 | 东营方圆有色金属有限公司 | Process method for improving qualified material granularity ratio by secondary classification of cyclone of concentrating mill |
| 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 |
| CN113941425A (en) * | 2021-09-16 | 2022-01-18 | 魏昌国 | Iron ore grinding and separating process |
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