CN211412329U - Low-grade micro-fine particle embedded magnetite quality-improving impurity-reducing ore dressing device - Google Patents

Abstract

The utility model discloses a low-grade fine particle inlays cloth magnetite and goes up matter and fall miscellaneous ore dressing device belongs to ore dressing technical field. The device comprises a belt conveyor, an intelligent blockage removal bin, a hopper, a high-pressure roller mill, a high-efficiency fine powder sieve, a permanent magnetic wet type coarse grain preselection magnetic separator, a dewatering sieve, a hydrocyclone, a high-efficiency permanent magnetic wet type magnetic separator, a pump pool, a slurry pump, a tower mill, a concentrate filter press, a tail throwing pipe, a total tailing pipe and a ball mill. When the device is used, firstly, the low-grade micro-fine particles are embedded with magnetite to be subjected to high-pressure roller grinding and screening, and the screened undersize product is subjected to coarse particle wet pre-selection to obtain pre-selection concentrate and pre-selection tailings; and carrying out three-stage grinding classification and three-stage high-efficiency magnetic separation on the obtained pre-selected concentrate to obtain a third-stage high-efficiency magnetic separation concentrate, namely the final iron concentrate. The utility model has the characteristics of energy-conserving green, and flow strong adaptability, stability is good, can show improvement iron ore concentrate grade, realizes the high-efficient recovery of low-grade fine particle magnetite.

Description

Low-grade micro-fine particle embedded magnetite quality-improving impurity-reducing ore dressing device

The technical field is as follows:

the utility model belongs to the technical field of the ore dressing, concretely relates to low-grade fine grain inlays cloth magnetite and carries matter and fall miscellaneous ore dressing device.

Background art:

iron ore is the metal ore which is most widely utilized and consumed in the world, is the 'grain' of the iron and steel industry, and is the 'blood' developed by the modern industry. The iron ore resources in China are rich in lean ores and rich ores, and are mainly characterized by poor, fine and impurity, and low average iron grade. Along with the rapid development of the steel industry in China, the demand of finished iron ores is increasing day by day, the quantity of easily-selected iron ores capable of being exploited and utilized is gradually reduced, objects for mineral separation treatment are depleted day by day, iron minerals in the ores gradually tend to the characteristic of fine particle-ultrafine particle embedding, the mineral separation difficulty is high, and the mineral separation cost is greatly improved.

In the technical field of iron ore dressing, the embedded granularity of iron mineral is 0.045 mm-0.025 mm, belonging to micro-fine particle embedding. The prior mineral processing technology for treating micro-fine particle magnetite ore resources mainly comprises the following steps: the method comprises the following steps of stage ore grinding-single low-intensity magnetic separation flow, stage ore grinding-low-intensity magnetic separation-reverse flotation flow, stage ore grinding-low-intensity magnetic separation (the low-intensity magnetic concentrate is subjected to quality improvement by an elutriator), stage ore grinding-low-intensity magnetic separation-fine screening-low-intensity magnetic separation flow, stage ore grinding-low-intensity magnetic separation-gravity separation flow and the like. The patent of CN 107413517A is that a fine screen is added to magnetic separation rough concentrate in a stage grinding-low-intensity magnetic separation process, and the weak magnetic separation of different types is respectively carried out on the screen and under the screen; an energy-saving ore dressing method for treating micro-fine particle magnetite (CN 107899738A) applied by a certain company is characterized in that an elutriation process is added to weak magnetic concentrate in a process in a stage grinding-weak magnetic separation process so as to improve the grade of the final concentrate. However, in practical applications, the above process has the following problems: (1) the fine crushed raw ore products of the magnetite need to be completely ground, the grinding quantity is large, the energy consumption is high, and the mineral separation cost is high; (2) a stage ore grinding-single magnetic separation process is adopted, although the process is simple, the ore grinding particle size distribution is uneven in the fine grinding stage, the minerals are easy to have the phenomena of incomplete dissociation or over grinding, and the concentrate grade cannot be effectively improved; (3) the reverse flotation is adopted for concentrate upgrading, so that although a better beneficiation index can be obtained, the consumption of beneficiation reagents can increase the production cost, and the reagents can generate certain influence on water resources; (4) the elutriation machine is added to the magnetic separation concentrate for quality improvement, corresponding water and electricity consumption can be increased, the operation cost is high, and meanwhile middlings generated by the elutriation machine can continuously return to the process. Therefore, aiming at the characteristics of the low-grade micro-particle embedded magnetic iron ore, the method has important practical significance and demonstration effect on researching and developing an economical and reasonable ore dressing process flow with advanced technology and related matched equipment with reliable work, high efficiency, energy conservation, safety and environmental protection so as to improve the quality of the concentrate and reduce the production cost of ore dressing.

The invention content is as follows:

the utility model discloses to the above-mentioned not enough and defect that prior art mentioned, provide a concentrate of high quality, low in production cost, the stable adaptability of technology good low-grade fine grain inlays cloth magnetite and goes up matter and fall miscellaneous ore dressing device.

The utility model provides a low-grade fine particle inlays cloth magnetite and carries matter and fall miscellaneous ore dressing device includes belt feeder 1, clear stifled feed bin 2 of intelligence, hopper 3, high-pressure roller mill 4, high-efficient fine powder sieve 6, proportioning bins 6.1, permanent magnetism wet-type coarse grain preselection magnet separator 7, dewatering screen 9, first hydrocyclone 11, first high-efficient permanent magnetism wet-type magnet separator 14, first pump sump 17, second sediment stuff pump 18, second hydrocyclone 20, second high-efficient permanent magnetism wet-type magnet separator 23, second pump sump 24, third hydrocyclone 27, third sediment stuff pump 29, third high-efficient permanent magnetism wet-type magnet separator 31, the second tower mill 36 of lower part feed, concentrate pressure filter 33, the fourth is thrown 37, the third is thrown tail pipe 38, the first tower 39 on feed mill upper portion, second tail pipe 40, first sediment stuff pump 41, third pump sump 42, total tail pipe 44 and ball mill 45.

The belt conveyor 1 is sequentially connected with the intelligent blockage removal bin 2, the hopper 3 and the high-pressure roller mill 4 respectively, the high-pressure roller mill 4 is connected with a high-efficiency fine powder sieve 6 through a pipeline, the high-efficiency fine powder sieve 6 is connected with a proportioning bin 6.1, the proportioning bin 6.1 is connected with a permanent magnetic wet type coarse grain preselection magnetic separator 7 through a sixteenth pipeline 6.2, and the permanent magnetic wet type coarse grain preselection magnetic separator 7 is respectively connected with a dewatering sieve 9 and a ball mill 45 through pipelines; the dewatering screen 9 is connected with a main tailing pipe 44 through a pipeline, the ball mill 45 is connected with a third pump pool 42 through a fifteenth pipeline 43, the third pump pool 42 is connected with a first hydrocyclone 11 through a first slurry pump 41 and a second pipeline 12, and the first hydrocyclone 11 is connected with the ball mill 45 through a first pipeline 10; the first hydrocyclone 11 is connected with a first high-efficiency permanent magnetic wet magnetic separator 14 through a third pipeline 13, the first high-efficiency permanent magnetic wet magnetic separator 14 is connected with a total tailing pipe 44 through a second tail pipe 40, the first high-efficiency permanent magnetic wet magnetic separator 14 is connected with a first pump pool 17 through a fifth pipeline 16, the first pump pool 17 is connected with a second hydrocyclone 20 through a second slurry pump 18 and a sixth pipeline 19, the second hydrocyclone 20 is connected with a first tower mill 39 fed at the upper part through a seventh pipeline 21, the first tower mill 39 fed at the upper part is connected with the first pump pool 17 through a fourth pipeline 15, the second hydrocyclone 20 is connected with a second high-efficiency permanent magnetic wet magnetic separator 23 through an eighth pipeline 22, the second high-efficiency permanent magnetic wet magnetic separator 23 is connected with the total tailing pipe 44 through a third tail pipe 38, the second high-efficiency permanent magnetic wet magnetic separator 23 is connected with a second pump pool 24 through a ninth pipeline 25, the second pump pool 24 is connected with a third hydrocyclone 27 through a third slurry pump 29 and a tenth pipeline 26, the third hydrocyclone 27 is connected with a second tower mill 36 feeding at the lower part through a twelfth pipeline 30, the second tower mill 36 feeding at the lower part is connected with the second pump pool 24 through a fourteenth pipeline 35, the third hydrocyclone 27 is connected with a third efficient permanent magnetic wet magnetic separator 31 through an eleventh pipeline 28, the third efficient permanent magnetic wet magnetic separator 31 is connected with a total tailing pipe 44 through a fourth tail throwing pipe 37, and the third efficient permanent magnetic wet magnetic separator 31 is connected with a concentrate filter press 33 through a thirteen pipeline 32.

The utility model is used for low-grade fine grain inlays cloth magnetite and goes up matter and fall miscellaneous ore dressing's concrete step as follows:

(1) carrying out fine crushing on the low-grade micro-fine particle embedded magnetite until the particle size reaches 25-0 mm, carrying out high-pressure roller grinding and superfine crushing to obtain a rolled product, screening the rolled product by adopting a high-efficiency fine powder screen to obtain an undersize product and an oversize product, and returning the oversize product to the high-pressure roller grinding to continue carrying out the superfine crushing;

(2) performing coarse grain wet preselection on the undersize product obtained in the step (1) to obtain preselection concentrate and preselection tailings;

(3) carrying out first-stage grinding classification on the pre-selected concentrate obtained in the step (2) to obtain overflow ore pulp and classified desanding ore, and returning the classified desanding ore to carry out the first-stage grinding classification;

(4) carrying out first-stage high-efficiency magnetic separation on the overflow ore pulp obtained in the step (3) to obtain first-stage high-efficiency magnetic separation concentrate and first one-stage high-efficiency magnetic separation tailings;

(5) carrying out second-stage grinding classification on the first-stage high-efficiency magnetic separation concentrate obtained in the step (4) to obtain overflow ore pulp and classified desanding ore, and returning the classified desanding ore to carry out second-stage grinding classification;

(6) performing second-stage high-efficiency magnetic separation on the overflow ore pulp obtained in the step (5) to obtain second-stage high-efficiency magnetic separation concentrate and second-stage high-efficiency magnetic separation tailings;

(7) carrying out third-stage grinding classification on the second-stage high-efficiency magnetic separation concentrate obtained in the step (6) to obtain overflow ore pulp and classified grit ore, and returning the classified grit ore to the third-stage grinding classification;

(8) and (4) carrying out third-stage high-efficiency magnetic separation on the overflow ore pulp obtained in the step (7) to obtain third-stage high-efficiency magnetic separation concentrate and third-stage high-efficiency magnetic separation tailings, wherein the third-stage high-efficiency magnetic separation concentrate is the final iron concentrate.

And (3) the equipment adopted in the coarse grain wet-type pre-concentration in the step (2) is a permanent magnet wet-type coarse grain pre-concentration magnetic separator, and the magnetic field intensity of the permanent magnet wet-type coarse grain pre-concentration magnetic separator is 5000 Gs.

The times of the high-efficiency magnetic separation in the step (4), the step (6) and the step (8) in the step (2) are 1 time, and the magnetic field intensity of the high-efficiency magnetic separation is 4000 Gs.

The first stage of ore grinding and classification refers to ball milling firstly and then classification by a hydrocyclone; the second stage of ore grinding and classification refers to classifying the hydrocyclone and then tower grinding; the third stage of ore grinding and classification refers to classification by using a hydrocyclone and then tower grinding; and the first stage of ore grinding classification is carried out by adopting a horizontal ball mill.

And (3) carrying out classification treatment on the pre-selected tailings obtained by the coarse wet pre-selection, wherein oversize products obtained by the classification treatment are used as building sandstone aggregates, and undersize products obtained by the classification treatment are combined with the first section of high-efficiency magnetic separation tailings, the second section of high-efficiency magnetic separation tailings and the third section of high-efficiency magnetic separation tailings to form total tailings.

And (2) the particle size of the high-efficiency fine powder sieve obtained in the step (1) is 3-0 mm.

In the step (3), the obtained overflow ore pulp with the fineness of-200 meshes accounts for 65-75 percent.

In the step (5), the fineness of the obtained overflow ore pulp is-325 meshes and is more than or equal to 70 percent.

In the step (7), the fineness of the obtained overflow ore pulp is-500 meshes and is more than or equal to 95 percent.

The utility model discloses in be used for low-grade fine particle to inlay when magnetic iron ore upgrading falls miscellaneous ore dressing at first adopt high-pressure roller mill-high-efficient fine powder sieve-the combination technology of coarse grain wet-type preliminary election to carry out the classification to high-pressure roll-in product, the qualified product of size carries out the wet-type preliminary election, has guaranteed under the coarse grain state that qualified tailing can be thrown out in advance, effectively gathers the concentrate, has reduced the income mill capacity to reach the mesh of sparingly grinding ore, and the granularity of roll-in product becomes thin and easy grindability improves, has improved the throughput of the first section grinding ore greatly; in the subsequent stage grinding-stage magnetic separation process of the first-stage high-efficiency magnetic separation concentrate, the two-stage grinding is carried out by adopting a tower mill, the high-efficiency magnetic separator is adopted for sorting the fine-ground qualified grain size products, and the high-efficiency magnetic separation concentrate after the third-stage tower mill grinding is the final iron concentrate.

The utility model aims at discarding qualified tailings as early as possible, selecting 3-0 mm coarse grain pre-selected concentrate to reduce the ore grinding amount of one-section ball milling, improving the total iron grade of the product subjected to the ore grinding, and greatly improving the processing capacity of one-section ore grinding due to the thinning of the granularity and the improvement of the grindability of the rolled product; two sections ore grinding after one section high-efficient magnetic separation all adopt the tower mill to grind, can improve the ore grinding efficiency of fine grinding technology greatly, energy saving and consumption reduction, and the product granularity of grinding is more even, is favorable to selecting other, and simultaneously, the hierarchical overflow product of hydrocyclone adopts high-efficient magnet separator to carry out the magnetic separation, not only makes the grade of magnetite concentrate obtain effectively improving, has still guaranteed the rate of recovery of iron, the utility model discloses the most suitable low-grade inlays the selection of cloth granularity at 0.045mm ~ 0.025mm superfine particle magnetite.

In the rough separation process, raw ore 25-0 mm after fine crushing is conveyed to an intelligent blockage removal bin 2 through a belt conveyor 1 for storage, the raw ore is distributed through a hopper 3 and enters a high-pressure roller mill 4 for ultra-fine crushing, the rolled material enters a high-efficiency fine powder screen 6 for screening, the oversize material returns to the hopper 3 through a high-lift angle belt conveyor 5 and is rolled again, the undersize material is fed into a proportioning bin 6.1, the proportioned material enters a permanent magnet wet type coarse particle preselection magnetic separator 7 for coarse particle preselection through a sixteenth pipeline 6.2, the rough separation tailings enter a dewatering screen 9 for dewatering classification, the oversize material 9.1 is good building material, and the undersize material 9.2 is thrown into a total tailing pipe 44. The coarse concentrate enters a ball mill 45 through a pipeline 8 and enters a high-efficiency fine grinding process flow.

In the roughing process, the intelligent blockage removing bin 2 has various forms, and can be selected from various forms and specifications of blockage removing bins such as a cylindrical flat-bottom bin (ZL 201410243926.3), a rectangular conical bin (ZL 201410245732.7), a V-shaped bin (ZL 201410245063.3) and the like.

The utility model provides a high pressure roller mill adopts articulated rack construction to be convenient for the roller and is the dismouting, and carbide stud roll surface is from giving birth to wear-resisting protective layer, and its life-span can reach 6000 ~ 20000 hours, and the roller shell need not frequently to be changed to the wear-resisting protection technology of unique side shield, can realize moving back the roller fast and rectify a deviation by oneself. The machine can realize superfine crushing, more crushing and less grinding, the particle size distribution of products is more uniform, the content of fine particles is higher, the preselection of minerals is convenient, the grinding amount is reduced, a large number of cracks can be generated in the ground minerals, the fine grinding is easy, and the energy consumption of ball milling can be greatly reduced. Alternative technical parameter ranges: diameter of the press roll: phi 1000 mm-2000 mm, roll surface length: 250-1800 mm, matched motor: 220 kw-4200 kw, particle size of feed: 20 mm-60 mm, throughput: 80-1900 t/h; in particular, the Chinese patent ZL201120126820.1 can be seen.

The utility model provides a high-efficient fine powder sieve is high-efficient dry-type screening equipment, shakes the screening efficiency of sieve than ordinary circle and improves more than 15%, and high-efficient fine powder sieve utilizes single drive to produce dual vibration principle, can make the elasticity sieve acutely shake, and the material obtains 30 ~ 50 g's bounce acceleration on the sieve, has strengthened the activity of material, is difficult for gluing sieve and stifled hole, and abundant loose sieve that passes through. The main technical performance ranges for selection are as follows: circular amplitude 4 ~ 7.5mm, linear amplitude 12 ~ 18mm, material acceleration 30 ~ 50g, feeding granularity 0 ~ 80mm, hierarchical granularity 2 ~ 8mm, sifter size width scope: 1500-3000 mm, 5250-10000 mm in length, 7.88-30 m2 in screening area, 80-500 t/h in processing capacity and 11-37 kw in motor power range. Particularly, the Chinese patent CN 201810605198A can be seen.

The utility model provides a permanent magnetism wet-type coarse grain preliminary election magnet separator is the preliminary election equipment before strong magnetic material goes into to grind. Adopt following current cell body structure, guaranteed the mobility of coarse grain material, the coarse grain export is adjustable, and the special design of magnetism system ensures that useful mineral fully retrieves, effectively throws except qualified tailing, has improved mill grade and production efficiency of going into of ball mill, has reached energy saving and consumption reduction purpose, and this quick-witted magnetic cylinder surface and cell body overflow surface adopt wear-resisting measure, have improved life, and the cell body of special design guarantees that the ore pulp flows smoothly unobstructed, does not produce the jam, its optional technical parameter scope: the diameter of the cylinder is 900-1500 mm, the length of the cylinder is 1800-4500 mm, the rotating speed is 25-13.6 r/min, and the magnetic induction intensity of the cylinder surface is determined according to the properties of ores. Processing capacity range: the dry ore amount is 40-240 t/h, the slurry amount is 110-600 m3/h, and the motor power is 4-22 kw. In particular, the Chinese patent ZL 201510241349.9 can be seen.

In the roughing process flow, the high-pressure roller mill is selected for carrying out superfine grinding, the high-efficiency fine powder sieve is used for grading, and the permanent magnet wet type coarse grain preselector is used for preselecting coarse grains; after entering the ball mill 45 from the pipeline 8, the coarse-grained concentrate enters the process flow of high-efficiency fine grinding and high-efficiency concentration.

The ball-milled material enters a third pump pool 42 through a fifteenth pipeline 43, enters the first hydrocyclone 11 through a first slurry pump 41 and a second pipeline 12, the coarse bottom processed by the first hydrocyclone 11 flows through a second pipeline 10 and returns to a ball mill 45 for secondary ball milling, the overflow processed by the first hydrocyclone 11 enters a first high-efficiency permanent magnetic wet magnetic separator 14 through a third pipeline 13 for first-stage high-efficiency magnetic separation, the bottom flows through a second tail pipe 40 and is thrown into a total tailing pipe 44, the concentrate enters the first pump pool 17 through a fifth pipeline 16 and enters a second hydrocyclone 20 through a second slurry pump 18 and a sixth pipeline 19 for classification, wherein the underflow of the second hydrocyclone 20 enters a first tower mill 39 with upper feeding through a seventh pipeline 21 for superfine grinding, and the ground material returns to the first pump pool 17 through a fourth pipeline 15, and entering an internal small circulation, wherein the overflow of the second hydrocyclone 20 enters a second high-efficiency permanent magnetic wet magnetic separator 23 through an eighth pipeline 22 for second-stage high-efficiency magnetic separation, the bottom flow of the second hydrocyclone 20 is discharged into a main tailing pipe 44 through a third tail throwing pipe 38, the concentrate is discharged into a second pump pool 24 through a ninth pipeline 25, then enters a third hydrocyclone 27 through a third slurry pump 29 and a tenth pipeline 26 for classification, the bottom flow of the concentrate enters a second tower mill 36 with lower feeding through a twelfth pipeline 30 for second-stage fine grinding, the lower feeding is selected to prevent over grinding of the materials, and the overflow product of the second tower mill 36 returns to the second pump pool 24 through a fourteenth pipeline 35 to form internal circulation of the second tower mill 36. The overflow product of the third hydrocyclone 27 enters the third section for high-efficiency magnetic separation through an eleventh pipeline 28 for final concentration, and the bottom flows through a fourth tail throwing pipe 37 and is discharged into a total tailing pipe 44. And finally, the iron ore concentrate enters a concentrate filter press 33 through a thirteenth pipeline 32, and is dehydrated to obtain iron ore concentrate 34.

The utility model provides a high-efficient permanent magnetism wet-type magnet separator chooses for use the high performance material preparation, and magnetism is the design and breaks through traditional magnet separator magnetism and is the magnetic circuit distribution structure, forms the magnetic field gradual change, and is level and smooth, and the high magnetic field performance of magnetism stirring factor and assorted multi-functional cell body with it break through traditional magnetic separation concept, obtains high-grade and high rate of recovery, obtains the national science and technology department and supports the innovation technology fund. The machine is most suitable for mineral separation after fine grinding by a tower mill. The main technical performance parameters of the method have the following optional ranges: the cylinder diameter phi is 750-1500 mm, the cylinder length is 1500-6000 mm, the rotating speed is 35-13.6 r/min, and the magnetic induction intensity of the cylinder surface is determined according to the properties of ores. Processing capacity range: the dry ore amount is 25-300 t/h, the ore pulp amount is 80-750 m3/h, and the motor power is 2.2-30 kw. In particular, the Chinese patent ZL 200820037987.4 can be seen.

The utility model provides a tower mill adopts closed circuit grinding return circuit, by hydrocyclone underflow feed, at the ore grinding in-process, the coarse grain sinks, and the fine particle come-up, its flow process nature layering, and churn lower part grinding intensity is the biggest, weakens gradually from supreme grinding intensity down, and this just with nature layering looks coincidence, the large granule is in grinding intensity large tracts of land and the fine particle is in the weak district of intensity, and this process is exactly that tower mill high efficiency energy-saving fundamental principle is located. The floating fine particles flow to a pump pool from an overflow port at the upper part of the tower mill and are conveyed to a hydrocyclone by a slurry pump to form closed circuit ore grinding of the tower mill. The selectable range of main technical parameters of the tower mill is as follows: 120-4800 t/d of ore pulp treatment capacity, 7.2-120 t of medium weight, 810-3300 mm of spiral diameter, 19-65 r/min of spiral rotation number, 1200-4200 mm of diameter of a stirring cylinder, 3000-4775 mm of height of the stirring cylinder, 3.5-66 m3 of volume of the stirring cylinder and 75-1200 kw of motor power; in particular, the Chinese patent ZL 201510241325.3 can be seen. The basic structure of the tower mill in the utility model is shown in figures 3-5. The tower mill has the advantages of energy conservation, high efficiency, low consumption of grinding media, small occupied area, low installation cost, open-air installation, high equipment operation rate up to 98 percent and low maintenance workload. The product fineness is easy to adjust, the particle size distribution is uniform, the ore feeding position is flexible, the noise is lower than 85dB, the operation is simple and safe, and the intelligent control is easy.

Compared with the prior art, the utility model has the following technical characteristics:

(1) the utility model discloses a high-pressure grinding of fine crushing product roller-high-efficient fine powder screening-coarse grain wet-type preliminary election technique carries out the superfine crushing with the raw ore, realizes breaking more and grinding less, and product particle size distribution is wide and the fine grit level is more after the roll-in, and high-efficient fine powder screen sieves high-pressure grinding product, and qualified size level carries out coarse grain wet-type preliminary election, can realize the wet-type tail of throwing under the coarse grain condition, and the qualified tailing yield of throwing is greater than 20%, greatly reduced the ore feeding capacity of one section ball-milling, practiced thrift the ore grinding energy consumption, use the utility model discloses an ore dressing process and current ore dressing process compare the energy consumption and reduce more than 20%, and the coarse grain product iron grade of sieving out in the coarse grain tailing is corresponding lower, not only qualified tailing can also regard as grit aggregate product.

(2) The utility model discloses two sections tower mills-magnetic separation technology to the adoption of one section high-efficient magnetic separation concentrate of gained can improve and grind ore efficiency, reduces the cross mill, practices thrift the energy consumption, and high-efficient fine-grained magnetic separator can improve more than 2 percentage points with current magnetic separator iron ore concentrate grade moreover.

(3) The utility model discloses green need not to use the flotation reagent.

(4) The utility model discloses to low-grade fine particle embedded magnetite, adopt specific ore dressing method to throw the tail in advance, fine grinding choice, improve the matter and fall miscellaneous, have better economic value in environment protecting mode; the flotation method is adopted for quality improvement, so that the cost is high, the environment is polluted, the conventional stage ore grinding-single magnetic separation process needs to be completely ground, the ore grinding cost is high, and the economic added value of the process technology is low.

Description of the drawings:

FIG. 1 is a schematic structural view of a low-grade fine particle magnetite embedded ore dressing device for quality improvement and impurity reduction;

FIG. 2 is a schematic structural diagram of a tower mill according to the present invention;

FIG. 3 is a schematic view of the operation cycle of the middle tower mill and the hydrocyclone of the present invention;

FIG. 4 is a schematic view of the tower mill transmission of the present invention;

fig. 5 is the installation schematic diagram of the stirring screw of the middle tower mill of the utility model.

In the figure: 1: a belt conveyor; 2: intelligently clearing a blocking bin; 3: a hopper 3; 4: a high pressure roller mill; 5: a high lift angle belt; 6: high-efficiency fine powder screening; 6.1: a proportioning bin; 6.2: a sixteenth pipeline; 7: a permanent magnet wet type coarse grain preselection magnetic separator; 8: a pipeline; 9: dewatering screen; 10: a first pipeline; 11: a first hydrocyclone; 12: a second pipeline; 13: a third pipeline; 14: a first high-efficiency permanent magnetic wet magnetic separator; 15: a fourth pipeline; 16: a fifth pipeline; 17: a first pump sump; 18: a second slurry pump; 19: a sixth pipeline; 20: a second hydrocyclone; 21: a seventh pipeline; 22: an eighth pipeline; 23: a second high-efficiency permanent magnetic wet magnetic separator; 24: a second pump sump; 25: a ninth conduit; 26: a tenth pipeline; 27: a third hydrocyclone; 28: eleven pipelines; 29: a third slurry pump; 30: a twelfth pipeline; 31: a third high-efficiency permanent magnetic wet magnetic separator; 32: thirteen pipelines; 33: a concentrate filter press; 34, iron ore concentrate; 35: a fourteenth pipeline; 36: a lower feed second tower mill; 37: fourthly, tail pipe throwing; 38: thirdly, tail pipe throwing; 39: a top feed first tower mill; 39.1: a tower mill drive system; 39.2: a reducer cover seat; 39.3: a drive device base; 39.4: an upper drive assembly; 39.5: the upper part of the mixing drum; 39.6: the lower part of the mixing drum; 39.7: an access door; 39.8: a door frame; 39.9: a bulb assembly; 39.10: mounting a trolley for a screw; 39.11: a mounting frame; 39.12: a small car beam; 39.13: a beam tail fixing block; 39.14: a trolley track; 39.1.1: a main motor; 39.1.2: a split serpentine coupling; 39.1.3: a speed reducer; 39.1.5: a thrust bearing box; 39.1.6: split sliding bearing seats; 39.1.7: a drive shaft; 39.1.8: a coupling flange; 39.1.9: a stirring screw assembly; 40: a second tail pipe throwing; 41: a first slurry pump; 42: a third pump sump; 43: a fifteenth pipeline; 44: a total tailings pipe; 45: a ball mill.

The specific implementation mode is as follows:

to facilitate understanding of the present invention, the present invention will be described more fully and specifically with reference to the accompanying drawings and preferred embodiments, but the scope of the present invention is not limited to the following specific embodiments.

Typical fine-grained magnetite ores processed by the present embodiment have fine grain sizes and complex structures. The main iron mineral is magnetite, and the secondary iron minerals are hematite (brown iron ore), iron carbonate and iron silicate, the gangue mineral mainly comprises siliceous oxide and iron silicate mineral, and a small amount of carbonate and calcium magnesium silicate mineral. The result of statistics of the magnetite by the measurement of the disseminated particle size under an electron microscope shows that the magnetite (containing maghemite) has fine particle size, about 54.38 percent is distributed at-0.038 mm and-0.074 mm, the content is 76.41 percent, and the disseminated particle size of siderite and limonite is relatively coarse.

The utility model is used for certain magnetite ore dressing plant's in Shanxi technical transformation project to "high-pressure grinding roller + coarse grain preselection", "tower mill + high-efficient magnetic separation" is the core technology, uses GLGY type high-pressure grinding roller, T-CCT type coarse grain preselection machine, and energy-conserving high-efficient patent equipment such as TGTM type tower mill and the high-efficient preparator of T-GCT series constitutes the utility model discloses the device has formed "high-pressure grinding roller + coarse grain preselection-ball-milling-tower mill + high-efficient magnetic separation" ore dressing process flow, obtains very big success in the ore dressing production industry of low-grade fine grain embedded magnet ore is used. The specific process steps are as follows:

(1) carrying out superfine grinding treatment on 25-0 mm raw ore with 24.26% iron grade by using a high-pressure roller mill, carrying out closed-circuit screening on a rolled product by using a 3mm high-efficiency fine powder sieve, rolling the oversize product serving as a return material and the fed raw ore, and carrying out wet coarse grain preselection on the undersize material.

(2) Performing coarse grain wet pre-selection on the undersize product in the step (1), wherein the number of pre-selection sections is one section, the magnetic field intensity is 5000Gs, and pre-selection tailings and pre-selection rough concentrate with the yield of 76.76%, the iron grade of 28.32% and the iron recovery rate of 89.61% are obtained; and screening the pre-selected tailings by using a 0.5mm dewatering screen to obtain the building sandstone aggregate with the yield of 10.05 percent, the iron grade of less than or equal to 9.52 percent and the granularity of 0.5-3 mm.

(3) Performing first-stage ore grinding on the coarse-grained pre-selected concentrate by using a horizontal ball mill, and classifying the product after ore grinding by using a hydrocyclone to obtain overflow ore pulp and underflow settled sand, wherein the fineness of the overflow ore pulp is-200 meshes and accounts for 70%, and the underflow settled sand of the hydrocyclone returns to the horizontal ball mill for ore grinding and classification;

(4) carrying out first-stage high-efficiency magnetic separation on the overflow ore pulp in the step (3), wherein the magnetic separation times are 1 time, and the magnetic field intensity is 4000Gs, so as to obtain first-stage high-efficiency magnetic separation tailings and first-stage high-efficiency magnetic separation concentrate with the yield of 42.46%, the iron grade of 41.52% and the iron recovery rate of 72.33%;

(5) and (4) grading the first-stage high-efficiency magnetic separation concentrate in the step (4) by using a hydrocyclone to obtain overflow ore pulp and underflow settled sand, wherein the fineness of the overflow ore pulp is-325 meshes and accounts for 70%, the underflow settled sand is returned to a tower mill for fine grinding, and the finely ground product enters the hydrocyclone for grading.

(6) And (4) carrying out second-stage high-efficiency magnetic separation on the overflow ore pulp in the step (5), wherein the magnetic separation times are 1 time, and the magnetic field intensity is 4000Gs, so that second-stage high-efficiency magnetic separation tailings and second-stage high-efficiency magnetic separation concentrate with the yield of 26.92%, the iron grade of 56.31% and the iron recovery rate of 62.48% are obtained.

(7) And (4) grading the second-stage high-efficiency magnetic separation concentrate in the step (6) by using a hydrocyclone to obtain overflow ore pulp and underflow settled sand, wherein the fineness of the overflow ore pulp is-500 meshes and accounts for 95%, the underflow settled sand is returned to a tower mill for fine grinding, and the finely ground product enters the hydrocyclone for grading.

(8) Carrying out third-stage high-efficiency magnetic separation on the overflow ore pulp in the step (7), wherein the magnetic separation frequency is 1 time, and the magnetic field intensity is 4000Gs, so as to obtain third-stage high-efficiency magnetic separation tailings and iron ore concentrate with the yield of 21.94%, the iron grade of 65.13% and the iron recovery rate of 58.89%; and (4) combining the three high-efficiency magnetic separation tailings obtained in the step (4), the step (6) and the step (8) into the final total tailings.

The utility model discloses the raw ore grade of handling is about 24.26%, adopts the utility model discloses obtained the whole iron grade 65.13% of iron ore concentrate, 58.89% technical indicator of rate of recovery compares with former production index, has improved about 3.13 percentage points and 4 percentage points respectively.

The utility model discloses handling low-grade fine grain and inlaying the magnet ore in-process, high pressure roller mill product adopts 3mm closed circuit, -3mm roll-in product adopts the wet-type preliminary election of coarse grain, can abandon the coarse grain tailing about 23%, and the coarse grain product iron content grade of sieving out in the coarse grain tailing is lower relatively, is not only qualified tailing, can also regard as grit aggregate product, has formed new economic growth point, and the fine fraction under the sieve has got into in the total tailing. Coarse concentrate is preselected by 3-0 mm coarse particles, so that the grinding amount of the primary ball milling is reduced, the full iron grade of a ground product is improved, the granularity of a rolled product is thinned, the grindability of the rolled product is improved, and the processing capacity of the primary grinding is greatly improved. The utility model replaces the original two-section and three-section long-cylinder ball mill fine grinding process, thoroughly solves the requirement of 95 percent of-500 meshes required by iron ore, and the tower mill has higher grinding efficiency than the ball mill, saves more energy, has more uniform granularity of ground products and is more beneficial to sorting; on the other hand, the high-efficiency magnetic separator is adopted for magnetic separation, and the concentrate grade also reaches more than 65% on the basis of ensuring the recovery rate.

Claims (1)

1. The quality-improving impurity-reducing mineral separation device for the low-grade micro-fine particle embedded magnetite is characterized by comprising a belt conveyor (1), an intelligent blocking bin (2), a hopper (3), a high-pressure roller mill (4), a high-efficiency fine powder sieve (6), a proportioning bin (6.1), a permanent magnet wet type coarse particle pre-selection magnetic separator (7), a dewatering sieve (9), a first hydraulic cyclone (11), a first high-efficiency permanent magnet wet type magnetic separator (14), a first pump pool (17), a second slurry pump (18), a second hydraulic cyclone (20), a second high-efficiency permanent magnet wet type magnetic separator (23), a second pump pool (24), a third hydraulic cyclone (27), a third slurry pump (29), a third high-efficiency permanent magnet wet type magnetic separator (31), a second tower mill (36) fed at the lower part, a concentrate filter press (33), a fourth tail pipe (37), a third tail pipe (38), a first tower mill (39) fed at the upper part, a slurry pump and a slurry throwing machine (39), A second tail pipe (40), a first slurry pump (41), a third pump pool (42), a main tailing pipe (44) and a ball mill (45); the belt conveyor (1) is sequentially connected with the intelligent blockage clearing bin (2), the hopper (3) and the high-pressure roller mill (4) respectively, the high-pressure roller mill (4) is connected with the high-efficiency fine powder sieve (6) through a pipeline, the high-efficiency fine powder sieve (6) is connected with the proportioning bin (6.1), the proportioning bin (6.1) is connected with the permanent magnetic wet coarse grain preselection magnetic separator (7) through a sixteenth pipeline (6.2), and the permanent magnetic wet coarse grain preselection magnetic separator (7) is connected with the dewatering sieve (9) and the ball mill (45) through pipelines respectively; the dewatering screen (9) is connected with the main tailing pipe (44) through a pipeline, the ball mill (45) is connected with the third pump pool (42) through a fifteenth pipeline (43), the third pump pool (42) is connected with the first hydrocyclone (11) through the first slurry pump (41) and the second pipeline (12), and the first hydrocyclone (11) is connected with the ball mill (45) through the first pipeline (10); the first hydrocyclone (11) is connected with the first high-efficiency permanent magnetic wet magnetic separator (14) through a third pipeline (13), the first high-efficiency permanent magnetic wet magnetic separator (14) is connected with the total tailing pipe (44) through the second throwing tail pipe (40), the first high-efficiency permanent magnetic wet magnetic separator (14) is connected with the first pump pond (17) through a fifth pipeline (16), the first pump pond (17) is connected with the second hydrocyclone (20) through the second slag slurry pump (18) and a sixth pipeline (19), the second hydrocyclone (20) is connected with the first tower mill (39) fed at the upper part through a seventh pipeline (21), the first tower mill (39) fed at the upper part is connected with the first pump pond (17) through a fourth pipeline (15), and the second hydrocyclone (20) is connected with the second high-efficiency permanent magnetic separator (23) through an eighth pipeline (22), the second high-efficiency permanent-magnet wet magnetic separator (23) is connected with the total tailings pipe (44) through the third tail pipe (38), the second high-efficiency permanent-magnet wet magnetic separator (23) is connected with the second pump sump (24) through a ninth pipeline (25), the second pump sump (24) is connected with the third hydrocyclone (27) through a tenth pipeline (26) through the third slurry pump (29), the third hydrocyclone (27) is connected with the second tower mill (36) of the lower feed through a twelfth pipeline (30), the second tower mill (36) of the lower feed is connected with the second pump sump (24) through a fourteenth pipeline (35), the third hydrocyclone (27) is connected with the third high-efficiency permanent-magnet wet magnetic separator (31) through an eleventh pipeline (28), and the third high-efficiency permanent-magnet wet magnetic separator (31) is connected with the total tailings pipe (44) through the fourth tail pipe (37), the third high-efficiency permanent magnetic wet magnetic separator (31) is connected with the concentrate filter press (33) through a thirteen-pipeline (32).

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