CN109351467B - Sorting process for treating maghemia mixed ore based on iron mineral embedded granularity - Google Patents

Sorting process for treating maghemia mixed ore based on iron mineral embedded granularity Download PDF

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CN109351467B
CN109351467B CN201811098617.6A CN201811098617A CN109351467B CN 109351467 B CN109351467 B CN 109351467B CN 201811098617 A CN201811098617 A CN 201811098617A CN 109351467 B CN109351467 B CN 109351467B
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magnetic
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concentrate
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strong
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CN109351467A (en
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吴文红
姚强
柴青平
陈国岩
梅灿国
袁哲
唐昊
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Ansteel Mining Co Ltd
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Ansteel Mining Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
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Abstract

The invention relates to a sorting process for treating magnetic hematite mixed ore based on the distribution granularity of iron minerals, which comprises the steps of feeding the mixed ore with the grade of 27% -29% and mainly magnetite into a first-stage closed circuit grinding to obtain primary overflow; the method is characterized in that: the method also comprises the operations of first-stage weak magnetic strong magnetism, fine screening, first-stage magnetic screening, elutriation and magnetic separation, second-stage closed circuit grinding, second-stage weak magnetic strong magnetism, second-stage magnetic screening, elutriation and magnetic separation, third-stage closed circuit grinding, third-stage weak magnetic strong magnetism and reverse flotation; through the operation, the final concentrate with the grade of 66-66.5% is obtained. Compared with the prior art, the invention has the advantages that: 1) the efficient separation process of segmented ore grinding, segmented ore taking and segmented tailing discarding for dissociating the maghemite mixed ore with uneven disseminated iron ore granularity is provided, the over-grinding is reduced, the energy is saved, and the consumption is reduced; 2) quality improvement is carried out by adopting magnetic sieve equipment, and three-section grinding is carried out by adopting a vertical grinding machine; 3) the process has simple structure, no middling circulation, easy field implementation and easy production management operation.

Description

Sorting process for treating maghemia mixed ore based on iron mineral embedded granularity
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a sorting process for treating magnetic red mixed ore based on the embedded granularity of iron minerals.
Background
Some magnet red mixed ore with high magnetic iron content (the content of magnetite accounts for more than 70% of the content of iron minerals), the iron minerals of the magnet red mixed ore mainly comprise magnetite, red brown iron ore, iron carbonate and iron silicate with low content; gangue minerals are mainly quartz, and the contents of harmful impurities such as sulfur and phosphorus are low. The intercalated particle size of iron minerals in the magnetite-hematite mixed ore is substantially non-uniform. The research on the process mineralogy properties of the maghemia mixed ore shows that the mixed ore is an ore with nonuniform magnetic mineral embedded particle size, firstly, the magnetic mineral embedded particle size is nonuniform in thickness, the average embedded particle size of the magnetite is 52 mu m, about 40 percent of the magnetite is thicker and can reach more than 85 mu m, and part of the magnetite is thinner and is only about 35 mu m; meanwhile, the embedded granularity of the hematite and the limonite in the ore is smaller and even and is only 35 mu m; the mineral aggregate has coarse embedded particle size, and the average embedded particle size reaches 75 μm.
At present, most of domestic iron ore dressing plants process poor iron ores mainly comprising magnetite and adopt a 'stage grinding single magnetic separation-fine screening regrinding flow' or a 'stage grinding-magnetic, heavy and floating combined flow' for sorting.
When mixed ore with high magnetite content is processed through the 'stage ore grinding single magnetic separation-fine screening regrinding process', generally because the hematite content is low and the embedded granularity is fine and difficult to separate, weak magnetic tailings separated from each stage are finally directly thrown out as final tailings, so that the final tailings have high grade due to high hematite and limonite content, the metal recovery rate of the process is greatly reduced, and useful iron mineral resources cannot be fully recycled; secondly, the 'stage grinding single magnetic separation-fine screen regrinding flow' is suitable for processing iron ore with fine embedded particle size of iron ore and relatively coarse particle size of gangue mineral, so that the tail can be sorted and discarded after the stage grinding, but the final qualified iron ore concentrate needs to be reground and reground; and thirdly, when fine-grained embedded iron minerals are graded and upgraded by adopting fine screening equipment in the process of stage ore grinding single magnetic separation-fine screening regrinding, because the size of a screen hole is small, the grading efficiency of the fine screen is low, and the amount of the ore returned to the fine screen for regrinding is large, so that not only is the ore grinding energy consumption increased, but also the iron ore is easily over-ground, and the metal recovery rate of the iron minerals and the final quality of concentrate are improved.
Other 'stage grinding-magnetic, heavy and floating combined processes' for treating the magnetic hematite mixed ore with high magnetic iron content are also stage grinding stage tailing discarding, and the final grading concentrate of the magnetic hematite is a grading process in which after one-stage grinding and one-stage grading tailing discarding, two-stage or three-stage grinding is carried out on one-stage rough concentrate to obtain final qualified iron concentrate, and the qualified tailings and the final concentrate can be discarded without sectional grinding. In the existing 'stage grinding-magnetic, gravity and floatation combined process', magnetite is separated to obtain final concentrate, and a weak magnetic-fine screening-weak magnetic mode or a gravity separation method (such as gravity separation equipment such as a spiral chute or a centrifuge) is generally adopted. The quality of the fine-grained embedded magnetite is improved by adopting a weak magnetic-fine screening-weak magnetic method, and on one hand, the gravity separation method has the advantages of large occupied space of equipment, low separation efficiency, middling circulation and difficult control of the process; in addition, in the 'step grinding-magnetic, heavy and floating combined flow', a large amount of magnetite middlings are combined with the hematite and limonite for separation by gravity separation or flotation method after being finely ground, gravity separation is not the best selection for separating magnetic ores, and the part of magnetic ores with higher content are subjected to flotation, so that the ore treatment amount of flotation is increased, the use amount of flotation reagents is increased, the separation cost is increased, and the reagent pollution is increased.
Disclosure of Invention
The invention aims to provide a sorting process for treating maghemia mixed ore based on the magnetite disseminated granularity, which treats the maghemia mixed ore mainly by carrying out sectional grinding, sectional fine taking and sectional tailing discarding on the maghemia mixed ore with uneven disseminated granularity.
The invention is realized by the following steps:
the invention relates to a sorting process for treating maghemia mixed ore based on iron mineral embedded granularity, which comprises the steps of feeding the mixed ore with the grade of 27-29 percent and the magnetic iron distribution rate higher than 70 percent into a first-stage closed circuit ore grinding operation consisting of a first-stage ore grinding and a first cyclone to obtain a first-stage grading overflow product with the granularity of-200 meshes and the content of 60-65 percent; the method is characterized in that: further comprising the following operations: the method comprises the following steps of first-stage weak magnetic and strong magnetic operation, fine screening operation, first-stage magnetic screening and first-stage elutriation magnetic separation operation, second-stage closed circuit grinding operation, second-stage weak magnetic and strong magnetic operation, second-stage magnetic screening and second-stage elutriation magnetic separation operation, third-stage closed circuit grinding operation, third-stage weak magnetic and strong magnetic operation and reverse flotation operation; the primary classification overflow product is treated by the primary weak magnetic and strong magnetic operation, the primary weak magnetic concentrate is treated by the fine screening operation, the undersize product is treated by the primary magnetic screen and the primary elutriation and magnetic separation operation, the secondary classification overflow product is treated by the secondary weak magnetic and strong magnetic operation, the secondary weak magnetic concentrate is treated by the secondary magnetic screen and the secondary elutriation and magnetic separation operation, the secondary weak magnetic concentrate is treated by the secondary weak magnetic and strong magnetic concentrate, the secondary weak magnetic concentrate is treated by the secondary weak magnetic and strong magnetic separation operation, the secondary weak magnetic concentrate and strong magnetic concentrate are treated by the secondary closed circuit grinding operation, the secondary weak magnetic and strong magnetic concentrate is treated by the secondary weak magnetic and strong magnetic concentrate, the tertiary classification overflow product is treated by the tertiary weak magnetic and strong magnetic concentrate, and the reverse flotation operation is used for treating the tertiary weak magnetic and strong magnetic concentrate.
The first-stage weak magnetic strong magnetic operation consists of a first-stage weak magnetic and a first-stage strong magnetic, the first-stage weak magnetic is fed into the first-stage graded overflow product to obtain a first-stage weak magnetic concentrate and a first-stage weak magnetic tailing with the grade of 55% -57%, the first-stage weak magnetic tailing is fed into a first-stage strong magnetic to obtain a first-stage strong magnetic concentrate and a first-stage strong magnetic tailing, and the first-stage strong magnetic tailing of coarse grains is discarded;
the fine screening operation is a high-frequency vibration fine screen with the screen hole size of 0.5 × 0.5.5 mm, and a section of weakly magnetic concentrate demagnetized by a demagnetizer is fed into the high-frequency vibration fine screen to obtain a product under the fine screen and a product on the fine screen;
the first-stage magnetic sieve and the first-stage elutriation magnetic separation operation consist of a first-stage magnetic sieve with 1.5mm sieve pores and a first-stage elutriation magnetic separator, products below a fine sieve are fed into the first-stage magnetic sieve to obtain first-stage magnetic sieve oversize concentrate and first-stage magnetic sieve undersize middlings with the grade of over 64.5%, and the first-stage magnetic sieve oversize concentrate is demagnetized by a demagnetizer and then fed into the first-stage elutriation magnetic separator to obtain first-stage elutriation magnetic separator coarse-grain concentrate and first-stage elutriation magnetic separator middlings with the grade of over 65.5%;
the second-stage closed circuit grinding operation is closed circuit grinding composed of a secondary cyclone and second-stage grinding, and the product on the fine screen, the first-stage strong magnetic concentrate and the middlings under the first-stage magnetic screen are combined and fed into the second-stage closed circuit grinding operation to obtain a secondary grading overflow product with the granularity of-200 meshes and the content of 85% -90%;
the second-stage weak magnetic strong magnetic operation consists of second-stage weak magnetism and second-stage strong magnetism, secondary grading overflow products are fed into the second-stage weak magnetism to obtain second-stage weak magnetic concentrate and second-stage weak magnetic tailings with the grade of more than 58%, the second-stage weak magnetic tailings are fed into the second-stage strong magnetism to obtain second-stage strong magnetic concentrate and second-stage strong magnetic tailings, and the second-stage strong magnetic tailings of medium particles are discarded;
the second-stage magnetic sieve and the second-stage elutriation magnetic separation operation consist of a second-stage magnetic sieve with 1.2mm sieve pores and a second-stage elutriation magnetic separator, the second-stage weak magnetic concentrate is demagnetized by a demagnetizer and then fed into the second-stage magnetic sieve to obtain second-stage magnetic sieve oversize concentrate and second-stage magnetic sieve undersize middlings with the grade of more than 65.5%, the second-stage magnetic sieve oversize concentrate is demagnetized by the demagnetizer and then fed into the second-stage elutriation magnetic separator to obtain second-stage elutriation magnetic separator middlings with the grade of more than 66.5%;
the three-section closed circuit grinding operation is closed circuit grinding composed of a tertiary swirler and a three-section vertical mill, and the three-section closed circuit grinding operation is implemented by combining first-section elutriation magnetic separator middlings, second-section magnetic sieve undersize middlings and second-section strong magnetic concentrate to obtain a tertiary grading overflow product with the granularity of-325 meshes and the content of 85% -90%;
the three-section weak magnetic strong magnetic operation consists of three sections of weak magnetism and three sections of strong magnetism, three sections of weak magnetism are fed into the three-section graded overflow product to obtain three sections of weak magnetic concentrate and three sections of weak magnetic tailings, three sections of weak magnetic tailings are fed into three sections of strong magnetism to obtain three sections of strong magnetic concentrate and three sections of strong magnetic tailings, and three sections of fine strong magnetic tailings are thrown away;
the reverse flotation operation is a one-rough one-fine three-sweep standard flow, concentrate of scavenging operation is returned to the upper section of operation in sequence, tailings of concentration operation are returned to the rough flotation operation, three sections of weak magnetic concentrate and three sections of strong magnetic concentrate are combined and fed into the reverse flotation operation, reverse flotation fine-grained concentrate and reverse flotation tailings with the grade of more than 67.5% are obtained, tailings of fine-grained reverse flotation are thrown, and the reverse flotation fine-grained concentrate, the second section of elutriation magnetic separator medium-grained concentrate and the first section of elutriation magnetic separator coarse-grained concentrate are combined into final concentrate with the grade of 66% -66.5%; the reverse flotation tailings, the three sections of strong magnetic tailings, the two sections of strong magnetic tailings and the one section of strong magnetic tailings are combined into final tailings, and the grade is 12% -14%.
Compared with the prior art, the invention has the advantages that:
1) the invention adopts the sectional grinding, the sectional taking of fine and the sectional discarding of the end to process the uneven thickness of the disseminated granularity of the iron mineral, and takes magnetite as the main mixed ore of magnetic red, in particular to the mixed ore with the uneven thickness of the disseminated granularity of the magnetite and the hematite and the magnetite content reaching more than 70 percent in the mixed ore of magnetic red, the invention provides a high-efficiency separation process of the sectional grinding, the sectional taking of fine and the sectional discarding of the end, which is the dissociation of the fine and the discarding of the end;
2) under the condition of one-stage coarse grinding, most of the coarse-grained embedded iron minerals are dissociated by monomers, and a part of qualified coarse-grained magnetite concentrate is obtained by adopting a weak magnetic-magnetic sieve-elutriation magnetic separator process; after two-stage grinding, most of the magnetite embedded with medium granularity is dissociated by monomers, and the other part of qualified medium-grain magnetite concentrate is obtained by adopting the weak magnetic-magnetic sieve-elutriation magnetic separator process, and for the iron minerals embedded with fine grains, after three-stage grinding, most of the magnetite embedded with fine grains is dissociated by monomers, and then the high-grade fine-grain magnetic hematite concentrate is obtained by adopting the mature weak magnetic-strong magnetic-reverse flotation process.
3) After the first-stage coarse grinding and magnetic separation, the quality is improved by adopting advanced magnetic sieve equipment, the model of the magnetic field screening machine is a CSX series magnetic field screening machine, and the situation that a large amount of magnetite-rich intergrowth is adsorbed while monomer magnetic mineral particles are attracted by adopting a traditional low-intensity magnetic separator due to higher magnetic field intensity is avoided, so that qualified iron ore concentrate is difficult to obtain under the condition of coarser granularity.
4) After the second-stage ore grinding magnetic separation, the quality is improved by adopting advanced magnetic screen equipment, the model of the magnetic screen is a CSX series magnetic screen machine, the yield of the ore concentrate product on the screen is high, the yield of the middling product under the screen is low, the content of the intergrowth is high, the separation efficiency is high, the fine ore grinding amount of the next stage is reduced, the ore grinding energy consumption is reduced, and the over-grinding phenomenon of iron minerals is avoided;
5) advanced ore grinding equipment is adopted for grinding, three sections of vertical mill mixers are JM series vertical mill mixers, a small amount of magnetic hematite and hematite which are embedded with fine particles difficult to grind and select also reach the monomer dissociation degree after the magnetic hematite and the hematite are finely ground by the vertical mill, high-grade flotation concentrate is obtained through an efficient reverse flotation process, and the grade of the final concentrate is improved to reach an ideal index;
6) the ore amount required for flotation is less, so that the operation difficulty of the process flow is simplified, the dosage of a flotation reagent is reduced, the separation cost is reduced, the reagent pollution is reduced, and the purposes of energy conservation and environmental protection are achieved;
7) the final concentrate product consists of coarse-grained magnetite concentrate, medium-grained magnetite concentrate and fine-grained bulk flotation concentrate, and the composition optimizes the feeding condition of the filter, can improve the filtering efficiency and reduce the filtering cost;
8) the magnetic sieve and the elutriation magnetic separator are organically combined, so that the grade of the final concentrate is further improved and stabilized;
9) the process has simple structure, no middling circulation in the process, easy field implementation and easy production management operation.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in figure 1, according to the characteristics of high magnetic iron content of raw ores, uneven thickness of iron mineral embedded granularity in the magnetite-hematite mixed iron ore and the like, the ore is separated by adopting the grinding and sorting process of sectional grinding, sectional fine taking and sectional tailing discarding.
The invention relates to a sorting process for treating maghemia mixed ore based on iron mineral embedded granularity, which comprises the steps of feeding the mixed ore with 28 percent of iron grade and 75 percent of magnetic iron distribution rate into a section of closed circuit ore grinding operation consisting of a section of ore grinding and a primary cyclone to obtain a primary grading overflow product with the granularity of-200 meshes and the content of 65 percent; the method is characterized in that: further comprising the following operations:
one-stage weak magnetic and strong magnetic operation: the first-stage weak magnetic and strong magnetic operation consists of a first-stage weak magnetic and a first-stage strong magnetic, the first-stage weak magnetic is fed into the first-stage graded overflow product to obtain a first-stage weak magnetic concentrate with the grade of 56% and a first-stage weak magnetic tailing, the first-stage weak magnetic tailing is fed into a first-stage strong magnetic to obtain a first-stage strong magnetic concentrate with the grade of 8%, and the first-stage strong magnetic tailing of coarse grains is discarded;
fine screening operation: the fine screening operation is a high-frequency vibration fine screen with the screen hole size of 0.5mm, and a section of weakly magnetic concentrate demagnetized by a demagnetizer is fed into the high-frequency vibration fine screen to obtain a fine screen undersize product and a fine screen oversize product;
one-section magnetic screening and one-section elutriation magnetic separation operation: the first-stage magnetic sieve and the first-stage elutriation magnetic separation operation consist of a first-stage magnetic sieve with 1.5mm sieve pores and a first-stage elutriation magnetic separator, products below a fine sieve are fed into the first-stage magnetic sieve to obtain first-stage magnetic sieve oversize concentrate with the grade of 64.7% and first-stage magnetic sieve undersize middlings, and the first-stage magnetic sieve oversize concentrate is demagnetized by a demagnetizer and then fed into the first-stage elutriation magnetic separator to obtain first-stage elutriation magnetic separator coarse-grain concentrate and first-stage elutriation magnetic separator middlings with the grade of 65.5%; after the coarse grinding, under the condition that the magnetite embedded in the coarse grains is dissociated into monomers, the monomer magnetic mineral particles in the ore pulp are magnetized into chains by the aid of a low-intensity magnetic field specially designed by a magnetic field screening machine. The method has the advantages that the sedimentation velocity difference and the size difference of the magnetite-gangue intergrowth are increased, the coarse-grain magnetite is effectively separated from the gangue and the intergrowth by adopting the special sieve arranged in the low-weak magnetic field, the phenomenon that the traditional low-weak magnetic separator attracts magnetic mineral particles due to high magnetic field intensity and adsorbs a large amount of rich magnetite intergrowth is avoided, and qualified iron ore concentrate is difficult to obtain under the condition of coarse granularity.
The invention relates to two-stage closed circuit ore grinding operation: the second-stage closed circuit grinding operation is closed circuit grinding composed of a secondary cyclone and second-stage grinding, and the product on the fine screen, the first-stage strong magnetic concentrate and the middlings under the first-stage magnetic screen are combined and fed into the second-stage closed circuit grinding operation to obtain a secondary grading overflow product with the granularity of-200 meshes and the content of 88%;
two-stage weak magnetic and strong magnetic operation: the second-stage weak magnetic strong magnetic operation consists of second-stage weak magnetism and second-stage strong magnetism, secondary grading overflow products are fed into the second-stage weak magnetism to obtain second-stage weak magnetic concentrate and second-stage weak magnetic tailings with the grade of 58%, second-stage weak magnetic tailings are fed into the second-stage strong magnetism to obtain second-stage strong magnetic concentrate and second-stage strong magnetic tailings with the grade of 11%, and the second-stage strong magnetic tailings of medium grains are discarded;
two-stage magnetic screening and two-stage elutriation magnetic separation operation: the second-stage magnetic sieve and the second-stage elutriation magnetic separation operation consist of a second-stage magnetic sieve with 1.2mm sieve pores and a second-stage elutriation magnetic separator, the second-stage weak magnetic concentrate is demagnetized by a demagnetizer and then fed into the second-stage magnetic sieve to obtain second-stage magnetic sieve oversize concentrate with the grade of 65.7% and second-stage magnetic sieve undersize middlings, the second-stage magnetic sieve oversize concentrate is demagnetized by the demagnetizer and then fed into the second-stage elutriation magnetic separator to obtain second-stage elutriation magnetic separator middlings and second-stage elutriation magnetic separator middlings with the grade of 66.5%; after the two-stage grinding ore is separated by weak magnetism, a magnetic field screening machine is also selected, and the vibration fine screen is abandoned for quality improvement of the medium-grain embedded magnetite concentrate, so that the screening efficiency is high based on the advantages of relatively larger screen hole size of the magnetic field screening machine, the amount of the medium ore under the screen is reduced, namely the subsequent fine grinding treatment amount is reduced, and the ball milling energy consumption can be further reduced.
Three-stage closed circuit grinding operation: the three-section closed circuit grinding operation is closed circuit grinding composed of a tertiary swirler and a three-section vertical grinder, and the three-section closed circuit grinding operation is implemented by merging the middlings of the first-section elutriation magnetic separator, the middlings of the second-section elutriation magnetic separator, the middlings under the sieve of the second-section magnetic sieve and the second-section strong magnetic concentrate to obtain a tertiary classification overflow product with the granularity of-325 meshes and the content of 91 percent;
three-stage weak magnetic and strong magnetic operation: three sections of weak magnetic and strong magnetic operation are composed of three sections of weak magnetic and three sections of strong magnetic, three sections of weak magnetic are fed into three sections of graded overflow products for three times, three sections of weak magnetic concentrate and three sections of weak magnetic tailings with the grade of 60% are obtained, three sections of strong magnetic tailings are fed into three sections of strong magnetic, three sections of strong magnetic concentrate with the grade of 35% and three sections of strong magnetic tailings with the grade of 13% are obtained, and three sections of fine strong magnetic tailings are discarded;
reverse flotation operation: the reverse flotation operation is a one-rough one-fine three-sweep standard flow, concentrate of each operation of scavenging returns to the upper section of operation in sequence, tailings of the concentration operation returns to the rough flotation operation, three sections of weak magnetic concentrates and three sections of strong magnetic concentrates are combined and fed into the reverse flotation operation, reverse flotation fine-grained concentrate with the grade of 67.7% and reverse flotation tailings with the grade of 18% are obtained, tailings of the fine-grained reverse flotation are thrown, and the reverse flotation fine-grained concentrate, the second-section elutriation magnetic separator medium-grained concentrate and the first-section elutriation magnetic separator coarse-grained concentrate are combined into final concentrate with the grade of 66.5%; the reverse flotation tailings, the three-section strong magnetic tailings, the two-section strong magnetic tailings and the one-section strong magnetic tailings are combined into final tailings, and the grade is 14%.
Brief introduction to magnetic field screening machine and vertical Mill
A magnetic field screening machine (magnetic screen for short) is a magnetic field screening method equipment, which is different from the traditional low-intensity magnetic separator by the principle of directly attracting magnetic mineral particles, the magnetic field screening machine magnetizes the magnetic mineral particles in ore pulp into a chain by using a special low-intensity magnetic field, the sedimentation velocity difference and the size difference of a magnetic iron ore and gangue intergrowth are increased, and meanwhile, the magnetic iron ore, the gangue and the intergrowth are effectively separated by using a special screen installed in the magnetic field, so that the dissociated micro-fine particle magnetic iron ore is produced as concentrate, the defects that the traditional low-intensity magnetic separator is easy to clamp the gangue and is more difficult to separate the intergrowth are solved, and the high-efficiency separation of the fine particle embedded magnetite is realized. The magnetic sieve is not a simple magnetic separation technical device, but a technical device for magnetic gravity combined separation by means of magnetic field medium characteristics (materials are sieved according to mineral purity, concentrate is on the sieve and the granularity is fine, and middlings are under the sieve and the granularity is coarse).
The vertical mill is fine grinding equipment which is vertically installed, fixed in a cylinder body and internally provided with a spiral stirring device. The vertical mill usually forms a closed circuit grinding with a cyclone, a spiral agitator is installed in the vertical direction of the central shaft of a cylindrical grinding chamber, the medium in the mill makes up-and-down circulation movement due to the spiral agitation action, and the added material is ground. The grinding medium is generally steel balls with a diameter of 12 mm. The material is fed from the lower part of the mill, after being ground by the medium, the qualified product is separated under the action of gravity and external force, overflows from the top of the mill, and the heavier particles are left in the mill to be continuously ground. The suitable product particle size P80 of the vertical mill is generally 74-20 mu m. Compared with a ball mill, the vertical mill has the advantages that: the high-efficiency fine grinding can prevent over-grinding; the energy consumption is saved, and is greatly reduced in a suitable product granularity range compared with that of a ball mill; easy to operate, maintain and install; low noise, small vibration, small occupied area and simple equipment foundation.

Claims (10)

1. A sorting process for processing magnetic red mixed ore based on iron mineral embedded granularity comprises the steps of feeding the mixed ore with the grade of 27% -29% and the magnetic iron distribution rate higher than 70% into a section of closed circuit ore grinding operation consisting of a section of ore grinding and a primary cyclone to obtain a primary grading overflow product with the granularity of-200 meshes and the content of 60% -65%; the method is characterized in that: further comprising the following operations: the method comprises the following steps of first-stage weak magnetic and strong magnetic operation, fine screening operation, first-stage magnetic screening and first-stage elutriation magnetic separation operation, second-stage closed circuit grinding operation, second-stage weak magnetic and strong magnetic operation, second-stage magnetic screening and second-stage elutriation magnetic separation operation, third-stage closed circuit grinding operation, third-stage weak magnetic and strong magnetic operation and reverse flotation operation; the primary classification overflow product is treated by the primary weak magnetic and strong magnetic operation, the primary weak magnetic concentrate is treated by the fine screening operation, the undersize product is treated by the primary magnetic screen and the primary elutriation and magnetic separation operation, the secondary classification overflow product is treated by the secondary weak magnetic and strong magnetic operation, the secondary weak magnetic concentrate is treated by the secondary magnetic screen and the secondary elutriation and magnetic separation operation, the secondary weak magnetic concentrate is treated by the secondary weak magnetic and strong magnetic concentrate, the secondary weak magnetic concentrate is treated by the secondary weak magnetic and strong magnetic separation operation, the secondary weak magnetic concentrate and strong magnetic concentrate are treated by the secondary closed circuit grinding operation, the secondary weak magnetic and strong magnetic concentrate is treated by the secondary weak magnetic and strong magnetic concentrate, the tertiary classification overflow product is treated by the tertiary weak magnetic and strong magnetic concentrate, and the reverse flotation operation is used for treating the tertiary weak magnetic and strong magnetic concentrate.
2. The separation process of mixed magnetic red ores based on iron mineral embedded granularity according to claim 1, characterized in that the first-stage weak magnetic strong magnetic operation consists of first-stage weak magnetic and first-stage strong magnetic, the first-stage weak magnetic is fed to the first-stage graded overflow product to obtain first-stage weak magnetic concentrate with 56% of grade and first-stage weak magnetic tailings, the first-stage weak magnetic tailings are fed to the first-stage strong magnetic to obtain first-stage strong magnetic concentrate and first-stage strong magnetic tailings with 6% -9% of grade, and the first-stage strong magnetic tailings of coarse grains are discarded.
3. The process of claim 1, wherein the fine screening is a high-frequency vibrating fine screen with a screen opening size of 0.5 × 0.5.5 mm, and the low-magnetic concentrate is demagnetized by a demagnetizer and fed into the high-frequency vibrating fine screen to obtain a product under the fine screen and a product on the fine screen.
4. The separation process of magnetic red mixed ore based on iron mineral embedded particle size according to claim 1, characterized in that the first-stage magnetic sieve and the first-stage elutriation magnetic separation operation are composed of a first-stage magnetic sieve with 1.5mm sieve pores and a first-stage elutriation magnetic separator, wherein the product below the fine sieve is fed into the first-stage magnetic sieve to obtain the first-stage magnetic-sieve oversize concentrate and the first-stage magnetic-sieve undersize middling with the grade of 64.5% or more, and the first-stage magnetic-sieve oversize concentrate is demagnetized by the demagnetizer and then fed into the first-stage elutriation magnetic separator to obtain the first-stage elutriation magnetic-separator coarse concentrate and the first-stage elutriation magnetic-separator middling with the grade of 65.5% or more.
5. The separation process of magnetic red mixed ore based on iron mineral embedded granularity as claimed in claim 1, characterized in that the second stage closed circuit grinding operation is closed circuit grinding composed of a secondary cyclone and a second stage grinding operation, and the product on the fine screen, the first stage strong magnetic concentrate and the middlings under the first stage magnetic screen are combined and fed into the second stage closed circuit grinding operation to obtain the secondary grading overflow product with granularity of-200 meshes and content of 85% -90%.
6. The separation process of magnetic red mixed ore based on iron mineral embedded granularity according to claim 1, characterized in that the second-stage weak magnetic strong magnetic operation is composed of a second-stage weak magnetic and a second-stage strong magnetic, the second-stage weak magnetic is fed to the secondary classification overflow product to obtain a second-stage weak magnetic concentrate and a second-stage weak magnetic tailing with a grade of more than 58%, the second-stage weak magnetic tailing is fed to the second-stage strong magnetic to obtain a second-stage strong magnetic concentrate and a second-stage strong magnetic tailing with a grade of 10% -12%, and the second-stage strong magnetic tailing of medium grain is discarded.
7. The separation process of magnetic red mixed ore based on iron mineral embedded particle size according to claim 1, characterized in that the second-stage magnetic sieve and the second-stage elutriation magnetic separation operation consist of a second-stage magnetic sieve with 1.2mm sieve pores and a second-stage elutriation magnetic separator, the second-stage weak magnetic concentrate is demagnetized by a demagnetizer and then fed into the second-stage magnetic sieve to obtain the second-stage magnetic sieve oversize concentrate with the grade of more than 65.5% and the second-stage magnetic sieve undersize middlings, the second-stage magnetic sieve oversize concentrate is demagnetized by a demagnetizer and then fed into the second-stage elutriation magnetic separator to obtain the second-stage elutriation magnetic separator middlings with the grade of more than 66.5% and the second-stage elutriation magnetic separator middlings.
8. The separation process of magnetic red mixed ore based on iron mineral embedded particle size according to claim 1, characterized in that the three-stage closed circuit grinding operation is a closed circuit grinding operation consisting of a tertiary cyclone and a three-stage vertical mill, and the three-stage closed circuit grinding operation is carried out by combining the middlings of a first-stage elutriation magnetic separator, the middlings of a second-stage elutriation magnetic separator, the middlings under a second-stage magnetic sieve and the second-stage strong magnetic concentrate to obtain a tertiary classification overflow product with the particle size of-325 meshes and the content of more than 90%.
9. The separation process for treating magnetic red mixed ore based on iron mineral embedded granularity according to claim 1, characterized in that the three-section weak magnetic strong magnetic operation consists of three sections of weak magnetic and three sections of strong magnetic, three sections of weak magnetic are fed with three sections of classified overflow products to obtain three sections of weak magnetic concentrate and three sections of weak magnetic tailings, three sections of weak magnetic tailings are fed with three sections of strong magnetic to obtain three sections of strong magnetic concentrate and three sections of strong magnetic tailings with 12% -14% grade, and three sections of fine strong magnetic tailings are discarded.
10. The process of claim 1, wherein the reverse flotation is a coarse-fine three-sweep standard process, the concentrate from each operation of sweeping returns to the upper stage of operation in sequence, the tailings from the concentration operation returns to the roughing operation, the three-stage weak magnetic concentrate and the three-stage strong magnetic concentrate are combined and fed to the reverse flotation, and a reverse flotation fine-grained concentrate with a grade of more than 67.5% and a reverse flotation tailings with a grade of 16% -18% are obtained, the reverse flotation tailings from the fines are discarded, the reverse flotation fine-grained concentrate, the medium-grained concentrate from the second-stage elutriation magnetic separator and the coarse-grained concentrate from the first-stage elutriation magnetic separator are combined into a final concentrate with a grade of 66% -66.5%; the reverse flotation tailings, the three-section strong magnetic tailings, the two-section strong magnetic tailings and the one-section strong magnetic tailings are combined into final tailings, and the product is 13% -15%.
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