CN115501964A - Dry-wet separation method for superfine crushing and coarse-fine grading of low-grade magnetite - Google Patents
Dry-wet separation method for superfine crushing and coarse-fine grading of low-grade magnetite Download PDFInfo
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- 238000000926 separation method Methods 0.000 title claims abstract description 136
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000011282 treatment Methods 0.000 claims abstract description 193
- 238000000034 method Methods 0.000 claims abstract description 77
- 239000012141 concentrate Substances 0.000 claims abstract description 73
- 239000002699 waste material Substances 0.000 claims abstract description 71
- 238000012216 screening Methods 0.000 claims abstract description 60
- 230000008569 process Effects 0.000 claims abstract description 51
- 238000003801 milling Methods 0.000 claims abstract description 18
- 238000007885 magnetic separation Methods 0.000 claims abstract description 7
- 238000007689 inspection Methods 0.000 claims description 21
- 238000000498 ball milling Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 abstract description 14
- 239000011435 rock Substances 0.000 abstract description 14
- 239000000047 product Substances 0.000 description 91
- 239000002245 particle Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000012467 final product Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000004575 stone Substances 0.000 description 7
- 238000005498 polishing Methods 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000010878 waste rock Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 201000010001 Silicosis Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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Abstract
The invention relates to a dry-wet separation method for superfine crushing and coarse grading of low-grade magnetite. The method comprises the following steps: performing hydraulic crushing treatment on the ore to obtain raw ore meeting the first size requirement; screening, crushing, dry separation and waste disposal are carried out on the raw ore in multiple stages to obtain concentrate meeting the second size requirement; carrying out high-pressure roller grinding treatment on the concentrate to obtain a roller grinding product meeting the third size requirement; and carrying out wet magnetic separation treatment on the roller-milled product to obtain rough concentrate. According to the ball mill, the principle that more broken pieces and less mills can be met to the utmost extent through screening treatment, crushing treatment, dry separation treatment and waste throwing treatment in multiple stages, and early throwing can be thrown, so that large-scale crushing and waste throwing before milling are realized, the treatment efficiency of the ball mill is further improved, and the waste rocks are thrown in advance and do not enter the ball mill, so that the yield of the waste rocks is improved. The ore dressing process of the concentrate can be more efficient and energy-saving.
Description
Technical Field
The invention relates to the technical field of magnetite production, in particular to a dry-wet separation method for superfine grinding and coarse grading of low-grade magnetite.
Background
In iron ore resources in China, because the lean ore accounts for a high ratio (accounting for 97.5 percent of the total reserves), most of the lean ore needs to be subjected to ore dressing treatment before smelting, and the production cost of iron ore in China is always high compared with that of iron ore rich in iron ore which can be directly charged abroad. Therefore, energy conservation and consumption reduction are the direction of continuous efforts of mineral separation technicians. At present, the crushing process of large and medium sized concentrating mills usually adopts a three-stage and one-closed-circuit crushing process, and the particle size d95 of the crushed final product is usually less than 12mm. Some small concentrating mills use a two-stage open-circuit crushing or two-stage closed-circuit crushing process, and the particle size d95 of the crushed final product is usually less than 20mm. In order to further reduce the production cost of ore dressing and improve the grinding grade, the crushing process flow needs to be optimized according to the energy-saving and consumption-reducing principle of' more crushing, less grinding and early polishing, the grinding granularity is reduced to the greatest extent, and the waste is polished to the greatest extent. In recent years, superfine crushing research and application are carried out successively, the granularity d95 of a crushed final product is lower than 6mm by adopting a four-section two-closed crushing process, and the granularity of the crushed final product is reduced. The medium-fine crushed products and the superfine crushed products are subjected to dry separation by adopting a magnetic pulley and a fine ore dry separator, so that the yield of the waste rocks is improved.
The superfine crushing process flow usually adopts four-section two-closed-circuit crushing and screening operation, uses a vertical shaft impact crusher to carry out the fourth-section superfine crushing, and adopts two-section dry separation to discard waste. However, the granularity of the crushed final product is lower than 6mm, the crushed final product is still thick, the mineral separation index is still not ideal, a large amount of waste rocks enter the process, the whole-process equipment type selection requirement is improved, and the mineral separation production cost and the construction investment are greatly increased; the vertical shaft impact crusher lining plate has short service life, low equipment operation rate and large labor capacity of workers; the dry screening and ultrafine crushing operation generates a large amount of dust, which causes the hazards of silicosis, noise, air pollution and the like. In the production, dust fall measures such as water sprinkling, dust suppression by spraying and the like are frequently adopted, so that the dry screening efficiency is reduced, and the mineral separation production index is further deteriorated.
The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention discloses a low-grade magnetite superfine crushing, coarse grading, dry grading and wet sorting method, which comprises the following steps:
performing hydraulic crushing treatment on the ore to obtain raw ore meeting the first size requirement;
screening, crushing, dry separation and waste disposal of the raw ore in multiple stages to obtain concentrate meeting a second size requirement, wherein the granularity of the second size requirement is smaller than that of the first size requirement;
performing high-pressure roller milling treatment on the concentrate to obtain a roller-milled product meeting a third size requirement, wherein the granularity required by the third size is smaller than the granularity required by the second size;
and carrying out wet magnetic separation treatment on the roller-milled product to obtain rough concentrate.
In a possible implementation manner, the screening treatment comprises pre-screening treatment and pre-inspection screening treatment, the crushing treatment comprises coarse crushing treatment, medium crushing treatment and fine crushing treatment, the dry separation treatment comprises first section dry separation treatment, second section dry separation treatment and third section dry separation treatment,
the method comprises the following steps of carrying out screening treatment, crushing treatment, dry separation treatment and waste disposal treatment on the raw ore in multiple stages to obtain concentrate meeting a second size requirement, wherein the granularity of the second size requirement is smaller than that of the first size requirement, and comprises the following steps:
pre-screening and coarsely crushing the raw ore to obtain coarsely crushed ore meeting a fourth size requirement, wherein the fourth size requirement is smaller than the first size requirement;
performing first-stage dry separation treatment on the coarse crushed ore to obtain first-stage dry separation concentrate, and performing waste disposal treatment on unselected first-stage dry separation tailings;
and carrying out medium crushing treatment, fine crushing treatment, second-stage dry separation treatment, third-stage dry separation treatment and pre-inspection screening treatment on the first-stage dry separation concentrate to obtain the concentrate, and carrying out waste disposal treatment on unselected tailings.
In one possible implementation, the raw ore is subjected to pre-screening and coarse crushing treatment to obtain coarse crushed ore meeting a fourth size requirement, and the method includes:
pre-screening the raw ore to obtain a product to be dry-sorted meeting the fourth size requirement and a product to be coarsely crushed not meeting the fourth size requirement;
carrying out coarse crushing treatment on the product to be coarsely crushed to obtain coarsely crushed ore;
and taking the product to be dry sorted as the coarse crushed ore.
In a possible implementation manner, the performing middle crushing, fine crushing, second-stage dry separation and third-stage dry separation on the first-stage dry separation concentrate to obtain the concentrate, and performing waste disposal on unselected tailings, includes:
carrying out intermediate crushing treatment on the first section of dry separation concentrate, and carrying out pre-inspection screening treatment on intermediate crushed products to obtain undersize products meeting the second size requirement and oversize products not meeting the second size requirement;
performing second-stage dry separation treatment and fine crushing treatment on the product on the screen to obtain the product under the screen, and performing waste disposal on unselected second-stage dry separation tailings;
and carrying out third-stage dry separation treatment on the undersize products to obtain the concentrate, and carrying out waste disposal treatment on unselected third-stage dry separation tailings.
In a possible implementation manner, the second-stage dry separation treatment and the fine crushing treatment are performed on the product on the screen to obtain the product under the screen, and the waste disposal treatment is performed on the unselected second-stage dry separation tailings, including:
performing second-stage dry separation treatment on the product on the sieve to obtain second-stage dry separation concentrate, and performing waste disposal on unselected second-stage dry separation tailings;
finely crushing the second section of dry-separation concentrate to obtain a finely crushed product;
and carrying out the pre-inspection screening treatment on the fine crushed products, wherein the fine crushed products meeting the second size requirement are used as the undersize products, and the fine crushed products not meeting the second size requirement are used as the oversize products.
In one possible implementation, the process of hydraulic crushing ore to obtain raw ore meeting a first size requirement includes:
performing grid screening treatment on the ore to obtain raw ore meeting the first size requirement and large ore which does not meet the first size requirement;
and carrying out hydraulic crushing treatment on the large ores to obtain the raw ores.
In one possible implementation, the high pressure roll milling of the concentrate to obtain a roll milled product meeting the third size requirement comprises:
carrying out high-pressure roller milling treatment on the concentrate to obtain a roller milled product meeting the third size requirement and a reprocessed product not meeting the third size requirement;
and (3) carrying out high-pressure roller milling treatment on the reprocessed product to obtain a roller milled product meeting a third size requirement.
In one possible implementation, the method further includes:
and sending the rough concentrate into a ball mill for ball milling treatment to obtain the concentrate.
In one possible implementation manner, the first stage dry separation process and the second stage dry separation process are performed by a bulk dry separator, and the third stage dry separation process is performed by a magnetic pulley.
In one possible implementation, the coarse crushing process is performed by a jaw crusher, the medium crushing process is performed by a medium-sized cone crusher, and the fine crushing process is performed by a fine-sized cone crusher.
According to the low-grade magnetite superfine crushing, coarse grading, dry and wet separation method disclosed by the embodiment of the disclosure, the principle of more crushing and less grinding can be met to the maximum extent through screening treatment, crushing treatment, dry separation treatment and waste throwing treatment in multiple stages, and early throwing can be thrown, so that large-scale crushing and waste throwing before grinding are realized, the treatment efficiency of the ball mill is further improved, and the waste rocks are thrown to be waste in advance and do not enter the ball mill, so that the yield of the waste rocks is increased. The ore dressing process of the concentrate can be more efficient and energy-saving.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. Other features and aspects of the present disclosure will become more apparent from the following detailed description of exemplary embodiments with reference to the attached drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.
FIG. 1 illustrates a flow diagram of a low-grade magnetite ultra-fine comminution coarse-fine classification dry-wet separation method in accordance with an embodiment of the present disclosure;
fig. 2 shows a schematic flow diagram of a low-grade magnetite ultrafine-crushing coarse-fine-classifying dry-wet separation method according to an embodiment of the disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present disclosure and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein.
It should be understood that, in various embodiments of the present disclosure, the sequence numbers of the processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the inherent logic of the processes, and should not constitute any limitation on the implementation process of the embodiments of the present disclosure.
It should be understood that in the present disclosure, "including" and "having" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present disclosure, "a plurality" means two or more. "and/or" is merely an association relationship describing an associated object, meaning that there may be three relationships, for example, and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "comprising a, B and C", "comprising a, B, C" means that all three of a, B, C are comprised, "comprising a, B or C" means comprising one of three of a, B, C, "comprising a, B and/or C" means comprising any 1 or any 2 or 3 of three of a, B, C.
It should be understood that in this disclosure, "B corresponding to a," "a corresponds to B," or "B corresponds to a," means that B is associated with a, from which B may be determined. Determining B from a does not mean determining B from a alone, but may be determined from a and/or other information. And the matching of A and B means that the similarity of A and B is greater than or equal to a preset threshold value.
As used herein, the term "if" may be interpreted as "at \8230; …" or "in response to a determination" or "in response to a detection" depending on the context.
The technical solution of the present disclosure is explained in detail with specific examples below. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 shows a flow diagram of a low-grade magnetite ultrafine coarse-fine fraction dry-wet separation method according to an embodiment of the present disclosure, as shown in fig. 1, the method comprising:
in step S11, carrying out hydraulic crushing treatment on the ore to obtain raw ore meeting the first size requirement;
in step S12, screening, crushing, dry separation, and waste disposal are performed on the raw ore in multiple stages to obtain a concentrate meeting a second size requirement, wherein the granularity of the second size requirement is smaller than the granularity of the first size requirement;
in step S13, performing high-pressure roll milling on the concentrate to obtain a roll-milled product meeting a third size requirement, wherein the particle size of the third size requirement is smaller than the particle size of the second size requirement;
in step S14, the roll-milled product is subjected to wet magnetic separation to obtain a rougher concentrate.
According to the low-grade magnetite superfine crushing, coarse grading, dry and wet separation method disclosed by the embodiment of the disclosure, the principle of more crushing and less grinding can be met to the maximum extent through screening treatment, crushing treatment, dry separation treatment and waste throwing treatment in multiple stages, and early throwing can be thrown, so that large-scale crushing and waste throwing before grinding are realized, the treatment efficiency of the ball mill is further improved, and the waste rocks are thrown to be waste in advance and do not enter the ball mill, so that the yield of the waste rocks is increased. The ore dressing process of the concentrate can be more efficient and energy-saving.
In a possible implementation mode, after hydraulic crushing treatment is carried out on large ores in a stope, screening treatment, crushing treatment, dry separation treatment and waste disposal treatment in multiple stages can be carried out, so that the ores are subjected to crushing treatment as much as possible, the granularity of products entering a ball mill is reduced, the efficiency of the ball mill is improved, and the energy consumption is reduced. And, still can throw useless the processing with the waste stone in advance, not only promote the waste stone output, additionally increase product classification and output, still can make the waste stone get into the ball mill as few as possible, improve the utilization ratio and the efficiency of ball mill.
Fig. 2 shows a schematic flow diagram of a low-grade magnetite ultrafine-crushing coarse-fine-classifying dry-wet separation method according to an embodiment of the disclosure.
In a possible implementation manner, in step S11, the ore in the stope may be subjected to hydraulic crushing treatment, so as to obtain raw ore meeting the first size requirement. In an example, the hydraulic breaking process may be performed by a hydraulic breaking hammer. The first size requirement may be a particle size below 1000mm. The present disclosure is not limited to the specific numerical values of the first dimensional requirement and the implementation equipment of the hydraulic fracturing treatment.
In one possible implementation, step S11 may include: performing grid screening treatment on the ore to obtain raw ore meeting the first size requirement and large ore which does not meet the first size requirement; and carrying out hydraulic crushing treatment on the large ores to obtain the raw ores.
In one possible implementation, the grid screen can directly screen out raw ores meeting the first size requirement, for example, raw ores with a particle size below 1000mm. If the large ores which do not meet the first size requirement exist, hydraulic crushing treatment can be carried out through equipment such as a hydraulic crushing hammer, and raw ores which meet the first size requirement are obtained. And avoid the bold ore to get into ore bin and block up the feed opening.
In a possible implementation manner, in step S12, the raw ore may be subjected to a screening process, a crushing process, a dry separation process and a waste disposal process in multiple stages, so as to obtain a concentrate meeting the second size requirement. Wherein the second size requirement has a smaller particle size than the first size requirement. For example, the second size requirement may be a particle size below 30mm. The present disclosure does not limit the specific numerical values required for the second dimension.
In a possible implementation, the objective of obtaining a concentrate that meets the second size requirement can be achieved by a multi-stage process. In an example, the screening treatment includes a pre-screening treatment and a pre-inspection screening treatment, the crushing treatment includes a coarse crushing treatment, a middle crushing treatment and a fine crushing treatment, and the dry separation treatment includes a first stage dry separation treatment, a second stage dry separation treatment and a third stage dry separation treatment. That is, the screening process, the crushing process, and the dry separation process may each include a plurality of stages, and by combining the screening process, the crushing process, and the dry separation process of the plurality of stages, the concentrate satisfying the second size requirement may be obtained. And the waste stone disposal treatment can be executed in the treatment of multiple stages, so that the yield of the waste stone is improved, and the amount of the waste stone entering the ball mill is reduced.
In one possible implementation, step S12 may include: pre-screening and coarsely crushing the raw ore to obtain coarsely crushed ore meeting a fourth size requirement, wherein the granularity of the fourth size requirement is smaller than that of the first size requirement; carrying out first-stage dry separation treatment on the coarse crushed ore to obtain first-stage dry separation concentrate, and carrying out waste disposal treatment on unselected first-stage dry separation tailings; and carrying out medium crushing treatment, fine crushing treatment, second-stage dry separation treatment, third-stage dry separation treatment and pre-inspection screening treatment on the first-stage dry separation concentrate to obtain the concentrate, and carrying out waste disposal treatment on unselected tailings.
In one possible implementation, the fourth size requirement may be a particle size below 160mm, and the disclosure does not limit the specific value of the fourth size requirement. Pre-screening and coarsely crushing the raw ore to obtain coarsely crushed ore meeting a fourth size requirement, wherein the method comprises the following steps: pre-screening the raw ore to obtain a product to be dry-sorted meeting the fourth size requirement and a product to be coarsely crushed not meeting the fourth size requirement; carrying out coarse crushing treatment on the product to be coarsely crushed to obtain coarsely crushed ore; and taking the product to be dry sorted as the coarse crushed ore.
In a possible implementation, the pre-screening treatment may be performed by feeding the raw ore into a heavy-duty circular vibrating screen by means of a vibrating bar feeder, and the product to be dry sorted satisfying a fourth size requirement, for example, a product to be dry sorted below 160mm, may be obtained. In the preliminary screening treatment, a product to be coarsely crushed which does not satisfy the fourth size requirement, for example, a product to be coarsely crushed having a particle size of more than 160mm may also be obtained, and in this case, the product to be coarsely crushed may be subjected to a coarse crushing treatment.
In one possible implementation, the coarse crushing process is performed by a jaw crusher. Through the coarse crushing treatment of the jaw crusher, coarse crushed ore meeting the fourth size requirement can be obtained. Meanwhile, products to be dry-sorted meeting the fourth size requirement obtained in the pre-screening separation process can be directly used as coarse crushed ores for subsequent treatment. The present disclosure is not limited as to the type of equipment that performs the coarse comminution process.
In one possible implementation, after obtaining the coarse crushed ore, a first stage dry separation process, for example, dry separation 1 in fig. 2, may be performed to obtain a first stage dry separation concentrate. In an example, the first stage dry separation process may be performed by a bulk dry separator. In the first section of dry separation treatment, first section of dry separation concentrate and unselected first section of dry separation tailings can be obtained, and the first section of dry separation tailings can be used as waste rocks to be subjected to waste disposal and enter a waste rock bin. The first stage dry concentration can enter the subsequent stage of treatment. For example, the medium crushing buffer bin can be entered by a belt feeder and then sequentially processed in subsequent stages.
In a possible implementation manner, in the subsequent treatment, the first-stage dry separation concentrate may be subjected to medium crushing treatment, fine crushing treatment, second-stage dry separation treatment, third-stage dry separation treatment and the pre-inspection screening treatment to obtain the concentrate, and the unselected tailings are subjected to waste disposal. For example, the subsequent treatment stages can be divided according to the size of the product obtained after the medium crushing treatment, so that different treatments can be performed, the concentrate can be obtained finally, and the waste rocks can be discarded in different treatments.
In a possible implementation manner, the performing middle crushing treatment, fine crushing treatment, second-stage dry separation treatment and third-stage dry separation treatment on the first-stage dry separation concentrate to obtain the concentrate, and performing waste disposal treatment on unselected tailings, includes: carrying out intermediate crushing treatment on the first section of dry separation concentrate, and carrying out pre-inspection screening treatment on intermediate crushed products to obtain undersize products meeting the second size requirement and oversize products not meeting the second size requirement; performing second-stage dry separation treatment and fine crushing treatment on the products on the screen to obtain products under the screen, and performing waste disposal on unselected second-stage dry separation tailings; and carrying out third-stage dry separation treatment on the undersize products to obtain the concentrate, and carrying out waste disposal treatment on unselected third-stage dry separation tailings.
In one possible implementation, the middle crushing process is performed by a middle cone crusher, and the present disclosure does not limit the type of equipment that performs the middle crushing process. The medium crushed product can enter a circular vibrating screen buffer bin. Further, the medium crushed products in the circular vibrating screen buffer bin can sequentially enter the circular vibrating screen to be subjected to the pre-inspection screening treatment, and undersize products (with the granularity smaller than 30mm, for example) meeting the second size requirement and oversize products not meeting the second size requirement (with the granularity larger than 30mm, for example) can be obtained. The sieve pores of the circular vibrating sieve are square holes or long-strip holes, which is not limited by the disclosure. The oversize product and undersize product may be subjected to different stages of treatment. For example, the oversize product may be subjected to a second stage dry separation treatment and the undersize product may be directly subjected to a third stage dry separation treatment.
In a possible implementation manner, the product on the sieve does not meet the second size requirement, therefore, not only the second stage dry separation treatment but also the fine crushing treatment is carried out, the product under the sieve meeting the second size requirement can be obtained, and the waste stone generated in the fine crushing process can be discarded. And performing second-stage dry separation treatment and fine crushing treatment on the product on the screen to obtain the product under the screen, and performing waste disposal treatment on unselected second-stage dry separation tailings, wherein the waste disposal treatment comprises the following steps: performing second-stage dry separation treatment on the product on the sieve to obtain second-stage dry separation concentrate, and performing waste disposal on unselected second-stage dry separation tailings; finely crushing the second section of dry separation concentrate to obtain a finely crushed product; and carrying out the pre-inspection screening treatment on the fine crushed products, wherein the fine crushed products meeting the second size requirement are used as the undersize products, and the fine crushed products not meeting the second size requirement are used as the oversize products.
In a possible implementation manner, the second-stage dry separation process is executed by a bulk dry separation machine, and the disclosure does not limit the type of equipment for executing the second-stage dry separation process. After the second-stage dry separation treatment, second-stage dry separation concentrate can be obtained, and the second-stage dry separation tailings can be used as waste rocks to be subjected to waste disposal and conveyed to a waste rock bin.
In a possible implementation mode, the second section of dry separation concentrate can be conveyed to a fine crushing buffer ore bin through a belt conveyor, and fine crushing treatment is sequentially carried out, so that a fine crushing product is obtained. The fine crushing treatment is carried out by a fine cone crusher. The present disclosure is not limited as to the type of equipment that performs the fine crushing process.
In a possible implementation mode, the fine crushed products obtained in the previous step can be disassembled to a belt conveyor and returned to the circular vibrating screen for the pre-inspection screening treatment, so that the pre-inspection screening treatment is performed again, the undersize products are subjected to third-stage dry separation treatment again, and the oversize products are subjected to second-stage dry separation treatment again, so that a fine crushing loop is formed, the fineness of the undersize products is improved, and the waste of the undersize products is reduced.
In a possible implementation, a third stage of dry separation treatment can be performed on the undersize product to obtain a concentrate. The third stage dry separation treatment is performed by a magnetic pulley, and the present disclosure does not limit the type of equipment performing the third stage dry separation treatment. Furthermore, the third section of dry tailings which are not selected can be discarded, the third section of dry tailings can be used as waste rocks and can also be conveyed to a waste rock bin, and the waste rocks in the waste rock bin can be used as ballast, so that the category of finished products is increased, and the yield and the output value are improved.
In one possible implementation, in step S13, after the concentrate satisfying the second size is obtained, the concentrate may be subjected to a high pressure roller milling process. Step S13 may include: performing high-pressure roller milling treatment on the concentrate to obtain a roller-milled product meeting the third size requirement and a reprocessed product not meeting the third size requirement; and (3) carrying out high-pressure roller milling treatment on the reprocessed product to obtain a roller milled product meeting the third size requirement.
In a possible implementation manner, the concentrate obtained in the third stage of dry separation can be conveyed to a high-pressure roller mill buffer bin, then conveyed to the high-pressure roller mill for superfine grinding through a belt feeder, and the produced product is subjected to inspection screening, for example, wet screening can be performed, in the inspection screening process, a linear vibrating screen or a GK screen can be used, and the disclosure does not limit the equipment for performing the inspection screening process. During inspection screening, a grinding roll product meeting a third size requirement, which in an example may be a grain size of less than 3mm, may be obtained. During the inspection screening it is also possible to obtain a product under process which does not meet the third dimensional requirements, for example a reprocessed product with a particle size of more than 3mm. The reprocessed product can be conveyed to a high-pressure roller milling buffer ore bin and subjected to high-pressure roller milling again, so that closed loop processing of the high-pressure roller milling is formed, waste of the product is reduced, and the granularity of the product is reduced.
The high pressure roller milling process may be performed by a high pressure roller mill, and the present disclosure does not limit an apparatus for performing the high pressure roller milling process.
In one possible implementation manner, in step S14, after the roll-milled product meeting the third size requirement is obtained, wet magnetic separation treatment may be performed on the roll-milled product to obtain rough concentrate, and the wet magnetic separation treatment may be performed by a wet drum magnetic separator, and the disclosure does not limit the apparatus for performing the wet magnetic separation treatment. In the process, the unselected tailings can be used as construction sand to be produced, so that the types of products are increased, and the economic benefit is improved.
In one possible implementation, the method further includes: and sending the rough concentrate into a ball mill for ball milling treatment to obtain the concentrate. Namely, the roughing concentrate can be continuously subjected to ball milling treatment to obtain a final product, namely, the concentrate, and the final product is treated by using the ball mill in the final stage, so that the granularity of the product entering the ball mill can be reduced, the efficiency of the ball mill is improved, and the energy consumption of the ball mill is reduced.
According to the low-grade magnetite superfine crushing coarse-fine grading dry-wet separation method disclosed by the embodiment of the disclosure, the principle of more crushing and less grinding and early polishing can be met to the maximum extent through screening treatment, crushing treatment, dry separation treatment and waste polishing treatment in multiple stages, so that the granularity of rough concentrate is lower than 3mm, the waste polishing yield reaches 50%, and compared with waste polishing treatment in the related technology, the waste polishing yield can be improved by 20%. Large-scale crushing and waste disposal before grinding are realized, and the treatment efficiency of the ball mill is improved by 30%. Can improve the mineral dressing index, reduce the energy consumption, save the production cost by 20 percent to 30 percent, and save the construction investment by 25 percent to 30 percent. The waste rocks and the tailings can be used as ballast and building sand to increase economic benefits. The aims of tailless mines and green mines are achieved. Meanwhile, the fine-grained wet tailings are reduced, and the production cost of the tailings and the occupied area of a tailing pond are reduced.
It is to be understood that the above-mentioned embodiments mentioned in the present disclosure can be combined with each other to form a combined embodiment without departing from the principle and logic, which is limited by the space, and the detailed description of the present disclosure is omitted. Those skilled in the art will appreciate that in the above methods of the specific embodiments, the specific order of execution of the steps should be determined by their function and possibly their inherent logic.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used in the present disclosure are selected to best explain the principles of the embodiments, the practical application, or improvements to the technology in the market, or to enable others of ordinary skill in the art to understand the embodiments of the present disclosure.
Claims (10)
1. A low-grade magnetite superfine crushing, coarse grading, dry grading and wet sorting method is characterized by comprising the following steps:
performing hydraulic crushing treatment on the ore to obtain raw ore meeting the first size requirement;
screening, crushing, dry separation and waste disposal of the raw ore in multiple stages to obtain concentrate meeting a second size requirement, wherein the granularity of the second size requirement is smaller than that of the first size requirement;
performing high-pressure roller milling treatment on the concentrate to obtain a roller milled product meeting a third size requirement, wherein the granularity of the third size requirement is smaller than the granularity of the second size requirement;
and carrying out wet magnetic separation treatment on the roller-milled product to obtain rough concentrate.
2. The method according to claim 1, wherein the screening process comprises a pre-screening process and a pre-inspection screening process, the crushing process comprises a coarse crushing process, a medium crushing process and a fine crushing process, the dry separation process comprises a first stage dry separation process, a second stage dry separation process and a third stage dry separation process,
the method comprises the following steps of screening, crushing, dry separation and waste disposal of the raw ore in multiple stages to obtain concentrate meeting a second size requirement, wherein the granularity of the second size requirement is smaller than that of the first size requirement, and the method comprises the following steps:
pre-screening and coarsely crushing the raw ore to obtain coarsely crushed ore meeting a fourth size requirement, wherein the granularity of the fourth size requirement is smaller than that of the first size requirement;
performing first-stage dry separation treatment on the coarse crushed ore to obtain first-stage dry separation concentrate, and performing waste disposal treatment on unselected first-stage dry separation tailings;
and performing medium crushing treatment, fine crushing treatment, second-stage dry separation treatment, third-stage dry separation treatment and pre-inspection screening treatment on the first-stage dry separation concentrate to obtain the concentrate, and performing waste disposal treatment on unselected tailings.
3. A method according to claim 2, wherein the raw ore is subjected to a pre-screening and coarse crushing process to obtain coarse crushed ore meeting a fourth size requirement, comprising:
pre-screening the raw ore to obtain a product to be dry-sorted meeting the fourth size requirement and a product to be coarsely crushed not meeting the fourth size requirement;
carrying out coarse crushing treatment on the product to be coarsely crushed to obtain coarsely crushed ore;
and taking the product to be dry sorted as the coarse crushed ore.
4. The method according to claim 2, wherein the first section of dry separation concentrate is subjected to medium crushing treatment, fine crushing treatment, second section of dry separation treatment and third section of dry separation treatment to obtain the concentrate, and unselected tailings are subjected to waste disposal treatment, and the method comprises the following steps:
performing intermediate crushing treatment on the first section of dry separation concentrate, and performing pre-inspection screening treatment on intermediate crushed products to obtain undersize products meeting the second size requirement and oversize products not meeting the second size requirement;
performing second-stage dry separation treatment and fine crushing treatment on the product on the screen to obtain the product under the screen, and performing waste disposal on unselected second-stage dry separation tailings;
and carrying out third-stage dry separation treatment on the undersize products to obtain the concentrate, and carrying out waste disposal treatment on unselected third-stage dry separation tailings.
5. The method of claim 4, wherein the second stage dry separation treatment and the fine crushing treatment are performed on the oversize product to obtain the undersize product, and the non-selected second stage dry separation tailings are subjected to waste disposal, and the method comprises the following steps:
performing second-stage dry separation treatment on the product on the sieve to obtain second-stage dry separation concentrate, and performing waste disposal on unselected second-stage dry separation tailings;
finely crushing the second section of dry-separation concentrate to obtain a finely crushed product;
and carrying out the pre-inspection screening treatment on the fine crushed products, wherein the fine crushed products meeting the second size requirement are used as the undersize products, and the fine crushed products not meeting the second size requirement are used as the oversize products.
6. A method according to claim 1, wherein the subjecting of the ore to a hydraulic crushing treatment to obtain a raw ore meeting first size requirements comprises:
performing grid screening treatment on the ore to obtain raw ore meeting the first size requirement and large ore which does not meet the first size requirement;
and carrying out hydraulic crushing treatment on the large ores to obtain the raw ores.
7. The method of claim 1, characterized in that the concentrate is subjected to high pressure roller milling to obtain a roller milled product meeting the third size requirement, comprising:
carrying out high-pressure roller milling treatment on the concentrate to obtain a roller milled product meeting the third size requirement and a reprocessed product not meeting the third size requirement;
and (3) carrying out high-pressure roller milling treatment on the reprocessed product to obtain a roller milled product meeting the third size requirement.
8. The method of claim 1, further comprising:
and sending the rough concentrate into a ball mill for ball milling treatment to obtain the concentrate.
9. The method of claim 2, wherein the first and second stage dry separation processes are performed by a bulk dry separator and the third stage dry separation process is performed by a magnetic pulley.
10. The method according to claim 2, wherein the coarse crushing process is performed by a jaw crusher, the middle crushing process is performed by a middle cone crusher, and the fine crushing process is performed by a fine cone crusher.
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