A beneficiation method and a beneficiation system

Abstract

The present invention provides a mineral processing method and a mineral processing system. The mineral processing method includes: feeding the crushed product into a first-stage grinding mill for first-stage grinding, and feeding the ground product into a magnetic classification pre-selection device for magnetic classification pre-selection; feeding the separated concentrate product obtained by magnetic classification pre-selection into a first-stage classification device for classification; feeding the overflow product of the first-stage classification into a mineral processing device for beneficiation; performing concentrate treatment on the beneficiated concentrate product to separate the moisture in the beneficiated concentrate product to obtain the final concentrate product. The present invention uses a magnetic classification pre-selection device in combination with a first-stage grinding mill. The magnetic classification pre-selection device integrates classification and magnetic separation into one, and is directly used after the grinding mill, optimizing the traditional grinding-classification-separation process in the first-stage mineral treatment, upgrading it to a grinding-separation process, removing the classification process, simplifying the mineral processing technological process, reducing the number of devices in the process, reducing the number of devices to be controlled, and reducing the floor area of the mineral processing devices.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and in particular to a mineral processing method and a mineral processing system. Background Art

[0002] my country is rich in mineral resources, but there are more poor ores and fewer rich ores, with fine grain size, many associated elements, and complex deposit types. With the continuous development and utilization of mineral resources, the characteristics of "poor, fine, and mixed" in my country's mineral resources are becoming increasingly apparent, and the iron ore is mined at a low grade and fine particle size. The development and utilization of resources is more difficult than before, and the requirements for the design of mineral processing procedures are also higher. This also leads to more complicated separation processes. At present, the domestic mineral processing process is basically fixed as grinding-classification-separation. The application effect of this process is stable and the technology is mature, but the process is cumbersome, the separation chain is long, and the process management is complex. The mineral processing process must have a certain degree of advancement and reliability, which is conducive to the effective and comprehensive utilization of mineral resources. The development trend of mineral processing technology is large-scale equipment specifications, low energy consumption of equipment, and automation of production process. And it requires environmental protection and production safety. The mineral processing process requires saving investment, smooth production compliance, good economic benefits, and improving the level of mineral processing technology. Therefore, in addition to using low-energy consumption and high-efficiency serial equipment as much as possible, it is also necessary to optimize and improve the sorting process to obtain a new sorting process that can not only meet the requirements of mineral processing technical indicators, but also improve sorting efficiency, simplify the sorting process, reduce the difficulty of process management, and reduce capital investment. Summary of the invention

[0003] In view of this, the present invention proposes a mineral processing method and a mineral processing system, aiming to provide a new mineral processing method and a new mineral processing system which can simplify the separation process, reduce the number of equipment, reduce the floor space of the separation plant, reduce the difficulty of equipment management and the mineral processing cost, and improve the efficiency of magnetite separation.

[0004] On the one hand, the present invention proposes a mineral processing method, which includes the following steps: a grinding pre-selection step, feeding the crushed product into a first-stage grinding machine for a first-stage grinding, and feeding the ground product into a magnetic grading pre-selection device for magnetic grading pre-selection to obtain coarse-grained minerals, sorted concentrate products and sorted tailings products; a grading step, feeding the sorted concentrate product obtained by the magnetic grading pre-selection into a first-stage grading device for grading; a concentrating step, feeding the overflow product of the first-stage grading into the ore dressing device for concentrating, to obtain a concentrating concentrate product and a concentrating tailings product; a concentrate treatment step, performing concentrate treatment on the concentrating concentrate product to separate the moisture in the concentrating concentrate product to obtain a final concentrate product.

[0005] Furthermore, for the above beneficiation method, the beneficiation method further comprises the following steps: a concentration beneficiation step of performing concentration beneficiation on the underflow product of the first-stage classification and / or the concentrated tailing product obtained by the beneficiation equipment to obtain a concentrated concentrate product and a concentrated tailing product; a second-stage grinding step of performing second-stage grinding on the concentrated concentrate product obtained by the concentration beneficiation; and a grinding and classification step of returning the grinding product obtained by the second-stage grinding to the first-stage classification equipment for re-classification.

[0006] Furthermore, for the above beneficiation method, the beneficiation method further comprises the following steps: a tailing treatment step of performing tailing treatment on the concentrated tailing product obtained by the concentrated beneficiation and / or the separated tailing product obtained by the magnetic classification pre-selection, and obtaining the final tailing after the treatment.

[0007] Furthermore, for the above beneficiation method, the tailing treatment is carried out in a tailing treatment device, and the tailing treatment device is a tailing dry discharge device or a tailing concentration device.

[0008] Furthermore, for the above beneficiation method, in the beneficiation step, at least one-stage beneficiation is performed on the overflow product of the first-stage classification. And during the at least one-stage beneficiation process, the corresponding concentrate products obtained in each stage of beneficiation are successively fed into the beneficiation equipment of the next stage for subsequent-stage beneficiation until the selected concentrate product and the selected tailing product are obtained in the last stage of beneficiation, and the corresponding tailing products obtained in each stage of beneficiation are all fed into the concentrated beneficiation equipment for concentration beneficiation.

[0009] Furthermore, for the above beneficiation method, the magnetic classification pre-selection specifically comprises: sorting the product after grinding according to the ore particle size to obtain fine-grained minerals and coarse-grained minerals, and directly discharging the coarse-grained minerals from the magnetic classification pre-selection equipment to return to the first-stage grinding for re-grinding; and performing magnetic separation on the fine-grained minerals according to the mineral magnetism to obtain magnetic minerals as the separated concentrate product and non-magnetic minerals as the separated tailing product.

[0010] Furthermore, for the above beneficiation method, the concentrate treatment is filtration treatment, and the filtrate after filtration is returned to the beneficiation equipment for reuse as makeup water; or, the concentrate treatment is precipitation treatment.

[0011] Furthermore, for the above beneficiation method, in the classification step, it further comprises: returning the coarse-grained minerals obtained by the magnetic classification pre-selection to the first-stage grinding mill for grinding to form a closed-circuit grinding and beneficiation cycle.

[0012] The ore dressing method provided by the present invention uses a magnetic classification pre-selection device in combination with a primary grinding mill. The magnetic classification pre-selection device integrates classification and magnetic separation into one. After being directly used behind the mill, the process becomes a grinding-separation process, changing the traditional grinding-classification-separation process in the primary mineral processing to a grinding-magnetic classification pre-selection device separation process, removing the classification process, simplifying the ore dressing process flow, reducing the number of devices in the process, reducing the number of devices to be controlled, reducing the floor area occupied by ore dressing equipment, having the advantages of improving separation efficiency, reducing the difficulty of process operation and management, and reducing ore dressing costs, and solving the problems of complex, cumbersome ore dressing process flow, long separation chain, and complex process management. At the same time, the magnetic classification pre-selection device can pre-reject tailings, reduce the amount of ore entering the process, improve separation efficiency, simplify the separation process, reduce the number of devices in the process, reduce the management difficulty of the concentrator, save the floor area of the concentrator, reduce the equipment management difficulty, ore dressing costs, and the investment funds of the concentrator. In addition to using a series of low-energy consumption and high-efficiency devices for this method, it is also necessary to optimize and improve the separation process to obtain a new separation process that can not only meet the requirements of ore dressing technical indicators, but also improve separation efficiency, simplify the separation process, reduce the difficulty of process management, and reduce the investment capital.

[0013] In addition, the coarse-grained minerals separated by the magnetic classification pre-selection device are directly returned to the primary grinding mill for re-grinding, so that the magnetic classification pre-selection device is used in combination with the primary grinding mill to form a grinding-separation closed circuit, enabling the coarse-grained minerals obtained by magnetic classification pre-selection to be re-ground and magnetically classified pre-selected again, that is, forming a grinding-separation closed-circuit operation process.

[0014] Furthermore, classification, thickening ore dressing and the mill are used in combination, and thickening ore dressing is added between classification and grinding to form a grinding-classification-separation closed-circuit process. The primary classification device is used as a pre-inspection classification device to pre-inspect and classify the minerals entering the process. The minerals are classified, and the fine-grained minerals enter the next-stage separation process. The underflow product after primary classification and the tailing products of primary ore dressing and secondary ore dressing are fed into thickening ore dressing together. The concentrate product of thickening ore dressing is fed into secondary grinding after thickening for re-grinding, and the product after grinding is returned to the primary classification device for classification again. The tailing product of thickening ore dressing directly enters the tailing treatment system for treatment, reducing the grinding amount entering secondary grinding, improving separation efficiency, and reducing grinding costs.

[0015] On the other hand, the present invention also provides a beneficiation system, which includes: a primary grinding mill, a magnetic classification pre-selection device, a primary classification device, a beneficiation device, and a concentrate treatment device; wherein, the primary grinding mill is used for performing primary grinding treatment; the inlet end of the magnetic classification pre-selection device is connected to the outlet end of the primary grinding mill, and is used to receive the product after grinding by the primary grinding mill, and perform magnetic classification pre-selection on the product after grinding to obtain coarse-grained minerals, separated concentrate products and separated tailing products; the inlet of the primary classification device is connected to the concentrate outlet of the magnetic classification pre-selection device, and is used to receive the separated concentrate products discharged from the concentrate outlet, and classify the separated concentrate products to obtain overflow products and underflow products; the inlet of the beneficiation device is connected to the overflow port of the primary classification device, and is used to receive the overflow products discharged from the overflow port, and perform beneficiation on the overflow products to obtain beneficiated concentrate products and beneficiated tailing products; the inlet of the concentrate treatment device is connected to the inlet of the beneficiation device, and is used to perform concentrate treatment on the beneficiated concentrate products to separate the moisture in the beneficiated concentrate products to obtain the final concentrate products.

[0016] Furthermore, the above beneficiation system further includes: a thickening beneficiation device, a secondary grinding mill, and a tailing treatment device; wherein, the inlet of the thickening beneficiation device is respectively connected to the underflow port of the primary classification device and the tailing outlet of the beneficiation device, and is used to receive the underflow products discharged from the underflow port and the beneficiated tailing products obtained by the beneficiation device and perform thickening separation on them to obtain thickened concentrate products and thickened tailing products; the inlet of the secondary grinding mill is connected to the concentrate outlet of the thickening beneficiation device, and is used to receive the thickened concentrate products obtained by the thickening separation device and perform secondary grinding on them; the outlet of the secondary grinding mill is connected to the inlet of the primary classification device, and is used to return the grinding products obtained by secondary grinding to the primary classification device for re-classification; the tailing treatment device is respectively connected to the tailing outlet of the thickening beneficiation device and the tailing outlet of the magnetic classification pre-selection, and is used to receive the thickened tailing products obtained by the thickening separation device and the separated tailing products obtained by the magnetic classification pre-selection and perform tailing treatment on them; the magnetic classification pre-selection device is provided with a coarse-grained outlet, and the coarse-grained outlet is connected to the inlet of the primary grinding mill, and is used to return the coarse-grained minerals obtained by the magnetic classification pre-selection device to the primary grinding mill for grinding to form a closed-circuit grinding and beneficiation cycle. Description of the Drawings

[0017] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0018] Figure 1 Flow chart of the ore dressing method provided by an embodiment of the present invention;

[0019] Figure 2 Process flow chart of the ore dressing method provided by an embodiment of the present invention;

[0020] Figure 3 Structural block diagram of the ore dressing system provided by an embodiment of the present invention. Detailed implementation manners

[0021] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. Hereinafter, the present invention will be described in detail with reference to the drawings and in conjunction with the embodiments.

[0022] Method embodiment:

[0023] Refer to Figures 1 to 2 , which shows the preferred process flow of the ore dressing method provided by an embodiment of the present invention. As shown in the figure, the ore dressing method includes the following steps:

[0024] Grinding and pre-selection step S1: feeding the crushed product into a first-stage grinding mill for first-stage grinding, and feeding the ground product into a magnetic classification pre-selection device for magnetic classification pre-selection to obtain coarse-grained minerals, separated concentrate products, and separated tailing products.

[0025] Specifically, first, the crushed product is fed into a first-stage grinding mill for first-stage grinding in the first-stage grinding mill. Among them, the first-stage grinding mill can be a ball mill, and of course, it can also be other grinding equipment, and no limitation is made thereto in this embodiment; then, the product obtained from the first-stage grinding is fed into a magnetic classification pre-selection device for magnetic classification pre-selection in the magnetic classification pre-selection device. The magnetic classification pre-selection device can select three products, namely coarse-grained minerals, separated concentrate products, and separated tailing products. In this embodiment, the magnetic classification pre-selection performed by the magnetic classification pre-selection device specifically includes: sorting the ground product according to the different particle sizes of the ore to obtain fine-grained minerals and coarse-grained minerals, and directly discharging the coarse-grained minerals from the magnetic classification pre-selection device and returning them to the first-stage grinding for re-grinding; for the fine-grained minerals, magnetic separation is performed on the fine-grained minerals according to the magnetic difference of the minerals to obtain magnetic minerals as separated concentrate products and non-magnetic minerals as separated tailing products. The magnetic minerals are selected and fed into the next process, and the non-magnetic minerals are directly discharged from the tailing port of the magnetic classification pre-selection device to the tailing treatment device and discharged as tailings after tailing treatment.

[0026] The classification step S2 returns the coarse-grained minerals obtained by magnetic classification pre-selection to the first-stage grinding mill for grinding to form a closed-circuit grinding and separation cycle, and feeds the separated concentrate product obtained by magnetic classification pre-selection into the first-stage classification equipment for first-stage classification.

[0027] Specifically, the coarse-grained minerals separated by the magnetic classification pre-selection equipment can be directly returned to the first-stage grinding mill for re-grinding, so that the magnetic classification pre-selection equipment and the first-stage grinding mill are used in combination to form a closed-circuit grinding and separation, enabling the coarse-grained minerals obtained by magnetic classification pre-selection to be ground again and subjected to magnetic classification pre-selection, that is, forming a closed-circuit operation process for grinding and separation. The separated concentrate product obtained by magnetic classification pre-selection can also enter the first-stage classification equipment for the first-stage classification operation, that is, further separation in the subsequent process. The separated tailing product obtained by magnetic classification pre-selection can also be discharged to the tailing treatment equipment and discharged after tailing treatment. In this embodiment, the first-stage classification equipment is used as a pre-inspection classification equipment to pre-inspect and classify the minerals entering the process. The minerals are classified, and the fine-grained minerals enter the next-stage separation process, while the coarse-grained minerals enter the thickening separation equipment for thickening separation. Among them, the first-stage classification equipment can classify the separated concentrate product to obtain an overflow product of fine-grained minerals and an underflow product of coarse-grained minerals. The first-stage classification equipment can be a hydrocyclone or other classification equipment, and no limitation is made to it in this embodiment.

[0028] The concentration step S3 feeds the overflow product of the first-stage classification into the ore dressing equipment for concentration to obtain a concentrated concentrate product and a concentrated tailing product.

[0029] Specifically, the overflow product of the first-stage classification, that is, the fine-grained minerals, can be fed into the ore dressing equipment for concentration, and the underflow product of the first-stage classification, that is, the coarse-grained minerals, can be fed into the thickening ore dressing equipment for thickening ore dressing operation. In this embodiment, the concentration can be to perform at least one stage of ore dressing on the overflow product of the first-stage classification. And during at least one stage of ore dressing, the corresponding concentrate products obtained from each stage of ore dressing are successively fed into the next-stage ore dressing equipment for subsequent-stage ore dressing until the final concentrated concentrate product and the concentrated tailing product are obtained from the last stage of ore dressing, and the corresponding tailing products obtained from each stage of ore dressing are all fed into the thickening ore dressing equipment for thickening separation. In this embodiment, two-stage ore dressing is taken as an example for illustration: First, the overflow product of the first-stage classification, that is, the fine-grained minerals, is fed into the first-stage ore dressing equipment for a first concentration, and then the concentrate product of the first concentration is fed into the second-stage ore dressing equipment for a second concentration. The tailing products of the two-stage concentration can be fed into the thickening ore dressing equipment for thickening separation. Of course, the number of ore dressing stages is not limited to the two-stage ore dressing in this embodiment. The number of ore dressing stages can be one stage, two stages, or multiple stages, as long as the separated products meet the technical index requirements.

[0030] The concentrate treatment step S4 performs concentrate treatment on the concentrated concentrate product to separate the moisture in the concentrated concentrate product and obtain the final concentrate product.

[0031] Specifically, the concentrated concentrate product obtained from the last stage of ore dressing is subjected to concentrate treatment to separate the moisture in the concentrated concentrate product from the concentrate product. In particular, the moisture therein can be separated to obtain the final concentrate product, which is convenient for the transportation of the concentrate product. Among them, the concentrate treatment can be sedimentation treatment carried out in a sedimentation tank to precipitate the concentrate product to obtain the final concentrate product. Of course, the concentrate treatment can also be to directly feed the concentrated concentrate product obtained from the last stage of ore dressing into a filter for filtration. The filtered concentrate product is the final concentrate product, and the filtrate obtained after filtration can be returned to the second-stage ore dressing equipment for re-separation. Of course, the filtrate obtained after filtration can be used as make-up water for any separation stage in the process, such as being fed into the first-stage ore dressing equipment as make-up water for the first-stage ore dressing equipment, not limited to only being able to be returned to the second stage. In this embodiment, the concentrate treatment is described by taking the filtration treatment as an example, and it can also be any other treatment method suitable for concentrate dehydration.

[0032] Concentration separation step S5: The underflow product of the first-stage classification and / or the concentrated tailing product obtained by concentrating the selected tailings of the ore dressing equipment are subjected to concentration separation to obtain a concentrated concentrate product and a concentrated tailing product.

[0033] Specifically, the underflow product of the first-stage classification equipment, the tailing product of the first-stage ore dressing equipment, and the tailing product of the second-stage ore dressing equipment can be fed into the concentration ore dressing equipment for concentration separation to obtain a concentrated concentrate product and a concentrated tailing product. That is to say, the concentration separation is carried out in the concentration ore dressing equipment. Among them, the concentration ore dressing equipment can carry out concentration separation on the coarse-grained minerals, that is, the underflow product of the first-stage classification equipment, the tailing product of the first-stage ore dressing equipment, and the tailing product of the second-stage ore dressing equipment, so as to pre-reject the non-magnetic minerals in the coarse-grained minerals, which can directly enter the tailing treatment system for treatment, so as to reduce the grinding amount entering the second-stage grinding, improve the separation efficiency, and reduce the grinding cost; the concentrate product of the concentration separation enters the second-stage grinding equipment, that is, the second-stage grinding mill, for re-grinding.

[0034] Second-stage grinding step S6: The concentrated concentrate product obtained from the concentration separation equipment is subjected to secondary grinding.

[0035] Specifically, the concentrated concentrate product obtained from the concentration separation equipment is fed into the second-stage grinding mill for secondary grinding. Among them, the second-stage grinding mill can also be a ball mill, and of course, it can be other grinding equipment, and no limitation is made thereto in this embodiment.

[0036] Grinding and classification step S7: The grinding product obtained from the second-stage grinding is returned to the first-stage classification equipment for re-classification.

[0037] Specifically, the grinding product of the secondary grinding mill is returned to the primary classification equipment for re-classification. In this embodiment, the primary classification, thickening beneficiation, and grinding mill are used in combination, and thickening beneficiation is added between classification and grinding to form a closed-circuit process of grinding-classification-beneficiation. At the same time, the underflow product after primary classification, the tailing products of primary beneficiation and secondary beneficiation can be fed into the thickening beneficiation together. The concentrate product of the thickening beneficiation is fed into the secondary grinding mill for re-grinding after thickening. The product after grinding is then returned to the primary classification equipment for classification, and the tailing product is treated twice.

[0038] Tailings treatment step S8: Treat the thickened tailings product obtained from the thickening beneficiation equipment and / or the separated tailings product obtained from magnetic classification pre-selection to obtain the final tailings after treatment.

[0039] Specifically, the tailings product of the thickening beneficiation equipment and the tailings product of magnetic classification pre-selection enter the tailings treatment system for treatment, and the final tailings are obtained after treatment. Among them,. In this embodiment, the tailings treatment can be carried out in the tailings treatment equipment. The tailings treatment equipment is only a way to treat the tailings product, and it is not limited to the tailings treatment method. It can be dry discharge of tailings or thickening of tailings, etc. That is, the tailings treatment equipment can be a dry discharge equipment for tailings or a thickening equipment for tailings.

[0040] In summary, the beneficiation method provided in this embodiment uses a magnetic classification pre-selection equipment in combination with a primary grinding mill. The magnetic classification pre-selection equipment integrates classification and magnetic separation into one. After being directly used behind the grinding mill, the process becomes a grinding-beneficiation process, changing the traditional grinding-classification-beneficiation process in primary mineral processing to a grinding-magnetic classification pre-selection equipment beneficiation process, removing the classification process, simplifying the beneficiation process flow, reducing the number of equipment in the process, reducing the number of equipment to be controlled, reducing the floor area of beneficiation equipment, and having the advantages of improving beneficiation efficiency, reducing the difficulty of process operation and management, and reducing beneficiation costs, etc., solving the problems of complex beneficiation process flow, cumbersome process, long beneficiation chain, and complex process management. At the same time, the magnetic classification pre-selection equipment can pre-discard tailings, reduce the amount of ore entering the process, improve beneficiation efficiency, simplify the beneficiation process, reduce the number of equipment in the process, reduce the management difficulty of the concentrator, save the floor area of the concentrator, and reduce the equipment management difficulty, beneficiation cost, and investment funds of the concentrator. In addition to using a series of low-energy-consuming and high-efficiency equipment, this method also needs to optimize and improve the beneficiation process to obtain a new beneficiation process flow that can not only meet the requirements of beneficiation technical indicators but also improve beneficiation efficiency, simplify the beneficiation process, reduce the difficulty of process management, and reduce the investment capital.

[0041] In addition, the coarse-grained minerals separated by the magnetic classification pre-selection device are directly returned to the first-stage grinding mill for re-grinding, so that the magnetic classification pre-selection device is used in conjunction with the first-stage grinding mill to form a closed grinding and separation circuit, enabling the coarse-grained minerals obtained by magnetic classification pre-selection to be ground again and subjected to magnetic classification pre-selection, that is, forming a closed operation process for grinding and separation.

[0042] Furthermore, classification, concentration ore dressing, and the grinding mill are used in combination, with concentration ore dressing added between classification and grinding to form a closed circuit process for grinding, classification, and separation. The first-stage classification device serves as a pre-inspection classification device to pre-inspect and classify the minerals entering the process. The minerals are classified, and the fine-grained minerals enter the next-stage separation process. The underflow product after the first-stage classification, together with the tailing products of the first-stage ore dressing and the second-stage ore dressing, are fed into the concentration ore dressing. The concentrate product of the concentration ore dressing is fed into the second-stage grinding mill for re-grinding after concentration, and the product after grinding is then returned to the first-stage classification device for classification. The tailing product of the concentration ore dressing directly enters the tailing treatment system for treatment, reducing the grinding amount entering the second-stage grinding mill, improving the separation efficiency, and reducing the grinding cost.

[0043] System embodiment:

[0044] See Figure 3 , which is a structural block diagram of the ore dressing system provided by the embodiment of the present invention. As shown in the figure, the ore dressing system includes: a first-stage grinding mill 1, a magnetic classification pre-selection device 2, a first-stage classification device 3, an ore dressing device 4, a concentrate treatment device 5, a concentration ore dressing device 6, a second-stage grinding mill 7, and a tailing treatment device 8; wherein,

[0045] The first-stage grinding mill 1 is used for performing first-stage grinding treatment. Specifically, the crushed product can be fed into the first-stage grinding mill 1 through the inlet of the first-stage grinding mill 1 for first-stage grinding in the first-stage grinding mill 1. Among them, the first-stage grinding mill 1 can be a ball mill, and of course, it can also be other grinding equipment, and no limitation is made thereto in this embodiment.

[0046] The inlet end of the magnetic classification pre-selection device 2 is connected to the outlet end of the primary grinding mill 1, and is used to receive the products after grinding by the primary grinding mill 1, and perform magnetic classification pre-selection on the products after grinding to obtain coarse-grained minerals, separated concentrate products and separated tailing products. Specifically, the products obtained by the primary grinding mill 1 through primary grinding are fed into the magnetic classification pre-selection device 2, and magnetic classification pre-selection is performed in the magnetic classification pre-selection device 2. The magnetic classification pre-selection device 2 can separate three kinds of products, namely coarse-grained minerals, separated concentrate products and separated tailing products; the separated tailing products obtained by magnetic classification pre-selection can be discharged to the tailing treatment device and discharged after tailing treatment. In this embodiment, the magnetic classification pre-selection device 2 may be provided with a coarse-grained outlet, and the coarse-grained outlet is connected to the inlet of the primary grinding mill 1, and is used to return the coarse-grained minerals obtained by the magnetic classification pre-selection device 2 to the primary grinding mill 1 for grinding to form a closed-circuit grinding and separation cycle, that is, the coarse-grained minerals separated by the magnetic classification pre-selection device 2 can be directly returned to the primary grinding mill 1 for re-grinding, so that the magnetic classification pre-selection device 2 and the primary grinding mill 1 are used in combination to form a grinding and separation closed circuit, so that the coarse-grained minerals obtained by magnetic classification pre-selection 2 are ground and magnetically classified again, that is, a closed-circuit operation process of grinding and separation is formed.

[0047] The inlet of the primary classification device 3 is connected to the concentrate outlet of the magnetic classification pre-selection device 2, and is used to receive the separated concentrate products discharged from the concentrate outlet, and classify the separated concentrate products to obtain overflow products and underflow products. Specifically, the separated concentrate products obtained by the magnetic classification pre-selection device 2 enter the primary classification device 3 for primary classification operation, that is, further separation is performed in the subsequent process. In this embodiment, the primary classification device 3 is used as a pre-inspection classification device to perform pre-inspection classification on the minerals entering the process, classify the minerals, the fine-grained minerals enter the next-stage separation process, and the coarse-grained minerals enter the thickening separation device 6 for thickening separation, that is, the underflow products of the primary classification device 3, that is, the coarse-grained minerals, can be fed into the thickening beneficiation equipment for thickening beneficiation operation. Among them, the primary classification device 3 can classify the separated concentrate products, obtain the overflow products of fine-grained minerals by overflow, and the underflow products of coarse-grained minerals. The primary classification device 3 can be a hydrocyclone or other classification devices, and no limitation is made to it in this embodiment.

[0048] The inlet of the beneficiation device 4 is connected to the overflow port of the primary classification device 3, and is used to receive the overflow products discharged from the overflow port, and perform beneficiation on the overflow products to obtain beneficiated concentrate products and beneficiated tailing products. Specifically, the overflow products of the primary classification device 3, that is, the fine-grained minerals, can be fed into the beneficiation device 4 for beneficiation to obtain beneficiated concentrate products and beneficiated tailing products.

[0049] The inlet of the concentrate treatment device 5 is connected to the inlet of the ore dressing device 4, and is used for treating the concentrated concentrate product obtained by the ore dressing device 4 to separate the moisture in the concentrated concentrate product and obtain the final concentrate product. Specifically, the concentrated concentrate product obtained by the ore dressing device 4 is treated to separate the moisture from the concentrated concentrate product and the concentrate product, especially the moisture can be separated to obtain the final concentrate product, which is convenient for the transportation of the concentrate product. Among them, the concentrate treatment device 5 can be a sedimentation tank for sedimentation treatment in the sedimentation tank to precipitate the concentrate product to obtain the final concentrate product and realize the dehydration treatment of the concentrate; of course, the concentrate treatment device 5 can also be a filter, and the filtrate outlet of the filter is connected to the water inlet of the ore dressing device 4. The filtrate of the filter is used for reuse as makeup water, that is, the obtained concentrated concentrate product is directly fed into the filter for filtration. The filtered concentrate product is the final concentrate product, and the filtrate obtained after filtration can be returned to the ore dressing device 4 for re-separation. Of course, the filtrate obtained after filtration can be used as makeup water at any separation stage in the process, such as being fed into the first-stage separation ore component 41 as makeup water for the first-stage separation ore component 41, not limited to only being able to be returned to the second-stage separation ore component 42. In this embodiment, the concentrate treatment device 5 is a filter, and the filtration treatment is taken as an example for description. It can also be any other treatment device suitable for concentrate dehydration for concentrate dehydration treatment.

[0050] The inlets of the thickening ore dressing device 6 are respectively connected to the underflow outlet of the first-stage classification device 3 and the tailings outlet of the ore dressing device 4, and are used for receiving the underflow product discharged from the underflow outlet and the concentrated tailings product obtained by the ore dressing device 4 and performing thickening separation on them to obtain a thickened concentrate product and a thickened tailings product. Specifically, the underflow product of the first-stage classification device 3 and the tailings product of the ore dressing device 4, such as the tailings product of the first-stage separation ore component 41 and the tailings product of the second-stage separation ore component 42, can be fed into the thickening ore dressing device 6 for thickening separation to obtain a thickened concentrate product and a thickened tailings product. That is to say, the thickening separation is carried out in the thickening ore dressing device 6. Among them, the thickening ore dressing device 6 can perform thickening separation on the coarse-grained minerals, that is, the underflow product of the first-stage classification device 3 and the tailings product of the first-stage separation ore component 41 and the tailings product of the second-stage separation ore component 42, to pre-reject the non-magnetic minerals in the coarse-grained minerals, which can directly enter the tailings treatment device 8 for treatment to reduce the grinding amount entering the second-stage grinding, improve the separation efficiency, and reduce the grinding cost; the concentrate product of the thickening separation enters the second-stage grinding mill 7 for re-grinding.

[0051] The inlet of the secondary grinding mill 7 is connected to the concentrate outlet of the thickening beneficiation equipment 6, and is used to receive the concentrated concentrate product obtained by the thickening beneficiation equipment 6 and perform secondary grinding on it. Specifically, the concentrated concentrate product obtained by the thickening beneficiation equipment 6 is fed into the secondary grinding mill 7 for secondary grinding. Among them, the secondary grinding mill 7 can also be a ball mill, and of course can be other grinding equipment, which is not limited in this embodiment.

[0052] The outlet of the secondary grinding mill 7 is connected to the inlet of the primary classification equipment 3, and is used to return the grinding product obtained by the secondary grinding mill 7 to the primary classification equipment 3 for reclassification. Specifically, the grinding product of the secondary grinding mill 7 is returned to the primary classification equipment 3 for reclassification. In this embodiment, the primary classification equipment 3, the thickening beneficiation equipment 6 and the secondary grinding mill 7 are used in series, and thickening beneficiation is added between classification and grinding to form a closed circuit process of grinding, classification and beneficiation; at the same time, the underflow product after the primary classification equipment 3 and the tailing products of the primary separation ore assembly 41 and the secondary separation ore assembly 42 can be fed into the thickening beneficiation equipment 6 together. The concentrate product obtained by the thickening beneficiation equipment 6 is concentrated and then fed into the secondary grinding mill 7 for regrinding. After grinding, the product is returned to the primary classification equipment 3 for classification, and the tailing product is treated twice.

[0053] The tailing treatment equipment 8 is respectively connected to the tailing outlet of the thickening beneficiation equipment 6 and the tailing outlet of the magnetic separation preselection equipment 2, and is used to receive the concentrated tailing product obtained by the thickening beneficiation equipment 6 and the separated tailing product obtained by the magnetic separation preselection equipment 2 and perform tailing treatment on them. Specifically, the tailing product of the thickening beneficiation equipment 6 and the tailing product of the magnetic separation preselection equipment 2 enter the tailing treatment equipment 8 for treatment, and the final tailing is obtained after treatment. In this embodiment, the tailing treatment can be carried out in the tailing treatment equipment 8. The tailing treatment equipment 8 is only a way to treat the tailing product, and is not limited to the tailing treatment method. It can be tailing dry discharge or tailing thickening, etc. That is, the tailing treatment equipment 8 can be a tailing dry discharge equipment or a tailing thickening equipment.

[0054] In this embodiment, the ore dressing equipment 4 may include: at least one stage of sequentially connected ore separation components; wherein, at least one stage of the ore separation components is used for performing at least one stage of ore dressing on the overflow product obtained by the first-stage classification equipment 3, and sequentially feeding the corresponding concentrate products obtained by the ore dressing of each stage of the ore separation components into the next-stage ore separation components for subsequent-stage ore dressing until the final-stage ore separation components obtain the selected concentrate products and the selected tailings products; the tailings product outlets of each stage of the ore separation components are all connected to the inlet of the thickening ore dressing equipment 6, and are used for feeding the corresponding tailings products obtained by the ore dressing of each stage of the ore separation components into the thickening ore dressing equipment 6 for thickening separation. Specifically, the concentration of the ore dressing equipment 4 may be to perform at least one stage of ore dressing on the overflow product of the first-stage classification equipment 3, and during the at least one stage of ore dressing process, sequentially feed the corresponding concentrate products obtained by the ore dressing of each stage into the next-stage ore dressing equipment for subsequent-stage ore dressing until the final-stage ore dressing obtains the selected concentrate products and the selected tailings products, and feed the corresponding tailings products obtained by the ore dressing of each stage into the thickening ore dressing equipment for thickening separation. In this embodiment, two-stage ore dressing is taken as an example for illustration, that is to say, the ore dressing equipment 4 includes: a first-stage ore separation component 41 and a second-stage ore separation component 42. Among them, first, the overflow product of the first-stage classification, that is, the fine-grained minerals, is fed into the first-stage ore separation component 41 for primary concentration, and then the concentrate product of the primary concentration is fed into the second-stage ore separation component 42 for secondary concentration. The tailings products of the two-stage concentration can be fed into the thickening ore dressing equipment 6 for thickening separation. Of course, the number of ore dressing stages is not limited to the two-stage ore dressing in this embodiment. The number of ore dressing stages can be one stage, two stages, or multiple stages, as long as the selected products meet the technical index requirements.

[0055] In this embodiment, the magnetic classification pre-selection device 2 may include: a particle size separation component and a magnetic separation component. Among them, the particle size separation component is used to separate the ground product according to the ore particle size to obtain fine-grained minerals and coarse-grained minerals; the coarse-grained outlet of the particle size separation component is connected to the inlet of the first-stage grinding mill, and is used to directly discharge the coarse-grained minerals and return them to the first-stage grinding mill for re-grinding; the inlet of the magnetic separation component is connected to the fine-grained outlet of the particle size separation component, and is used to receive the fine-grained minerals discharged by the particle size separation component, and perform magnetic separation on the fine-grained minerals according to the mineral magnetism to obtain magnetic minerals as the separated concentrate product and non-magnetic minerals as the separated tailings product. Specifically, the particle size separation component separates the ground product according to different ore particle sizes to obtain fine-grained minerals and coarse-grained minerals, and directly excludes the coarse-grained minerals from the magnetic classification pre-selection device and returns them to the first-stage grinding for re-grinding; the magnetic separation component performs magnetic separation on the fine-grained minerals according to the magnetic difference of the minerals to obtain magnetic minerals as the separated concentrate product and non-magnetic minerals as the separated tailings product. The magnetic minerals are separated and fed into the next process, and the non-magnetic minerals are directly discharged from the tailings outlet of the magnetic classification pre-selection device to the tailings treatment device 8 and discarded after tailings treatment.

[0056] It should be noted that since the ore dressing method and the ore dressing system principle in this embodiment are the same, the relevant parts can be referred to each other.

[0057] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0058] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0059] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A mineral processing method, characterized in that, It includes the following steps: The grinding pre-selection step: feeding the crushed product into a first-stage grinding mill for first-stage grinding, and then feeding the ground product into a magnetic classification pre-selection device for magnetic classification pre-selection to obtain coarse-grained minerals, separated concentrate products, and separated tailings products; The classification step: feeding the separated concentrate products obtained from magnetic classification pre-selection into a first-stage classification device for classification; The cleaning step: feeding the overflow product of the first-stage classification into a beneficiation device for cleaning to obtain cleaned concentrate products and cleaned tailings products; The concentrate treatment step: treating the cleaned concentrate products to separate the moisture in the cleaned concentrate products to obtain the final concentrate products; The thickening separation step: performing thickening separation on the underflow product of the first-stage classification and / or the cleaned tailings products obtained by cleaning the beneficiation device to obtain thickened concentrate products and thickened tailings products; The second-stage grinding step: performing second-stage grinding on the thickened concentrate products obtained from thickening separation; The grinding classification step: returning the ground products obtained from the second-stage grinding to the first-stage classification device for re-classification; In the said cleaning step, at least one stage of beneficiation is performed on the overflow product of the first-stage classification. And during at least one stage of beneficiation, the corresponding concentrate products obtained from each stage of beneficiation are successively fed into the next-stage beneficiation device for subsequent-stage beneficiation until the final stage of beneficiation to obtain cleaned concentrate products and cleaned tailings products, and the corresponding tailings products obtained from each stage of beneficiation are all fed into a thickening beneficiation device for thickening separation; The said magnetic classification pre-selection specifically includes: Sorting the ground product according to the ore particle size to obtain fine-grained minerals and coarse-grained minerals, and directly discharging the coarse-grained minerals from the magnetic classification pre-selection device to return to the first-stage grinding for re-grinding; Performing magnetic separation on the fine-grained minerals according to the mineral magnetism to obtain magnetic minerals as the separated concentrate products and non-magnetic minerals as the separated tailings products.

2. The ore dressing method according to claim 1, characterized in that, It also includes the following steps: The tailings treatment step: treating the thickened tailings products obtained from thickening beneficiation and / or the separated tailings products obtained from magnetic classification pre-selection to obtain the final tailings after treatment.

3. The beneficiation method according to claim 2, wherein The said tailings treatment is carried out in a tailings treatment device, and the said tailings treatment device is a tailings dry discharge device or a tailings thickening device.

4. The beneficiation method according to any one of claims 1 to 3, wherein In the said cleaning step, at least one stage of beneficiation is performed on the overflow product of the first-stage classification. And during at least one stage of beneficiation, the corresponding concentrate products obtained from each stage of beneficiation are successively fed into the next-stage beneficiation device for subsequent-stage beneficiation until the final stage of beneficiation to obtain cleaned concentrate products and cleaned tailings products, and the corresponding tailings products obtained from each stage of beneficiation are all fed into a thickening beneficiation device for thickening separation.

5. The beneficiation method according to any one of claims 1 to 3, wherein The said concentrate treatment is filtration treatment, and the filtrate after filtration is returned to the beneficiation device for reuse as makeup water; or, the said concentrate treatment is sedimentation treatment.

6. The beneficiation method according to any one of claims 1 to 3, wherein In the classification step, it further includes: returning the coarse-grained minerals obtained by magnetic classification preselection to the primary grinding mill for grinding to form a closed-circuit grinding and separation cycle.

7. A beneficiation system, characterized in that, It includes: A primary grinding mill, a magnetic classification preselection device, a primary classification device, a beneficiation device, and a concentrate treatment device; among them, The primary grinding mill is used for primary grinding treatment; The inlet end of the magnetic classification preselection device is connected to the outlet end of the primary grinding mill, and is used to receive the product after grinding by the primary grinding mill and perform magnetic classification preselection on the product after grinding to obtain coarse-grained minerals, separated concentrate products, and separated tailing products; The inlet of the primary classification device is connected to the concentrate outlet of the magnetic classification preselection device, and is used to receive the separated concentrate product discharged from the concentrate outlet and classify the separated concentrate product to obtain an overflow product and an underflow product; The inlet of the beneficiation device is connected to the overflow port of the primary classification device, and is used to receive the overflow product discharged from the overflow port and perform beneficiation on the overflow product to obtain a beneficiated concentrate product and a beneficiated tailing product; The inlet of the concentrate treatment device is connected to the inlet of the beneficiation device, and is used to perform concentrate treatment on the beneficiated concentrate product to separate the moisture in the beneficiated concentrate product to obtain a final concentrate product; It further includes: a thickening beneficiation device, a secondary grinding mill, and a tailing treatment device; among them, The inlet of the thickening beneficiation device is respectively connected to the underflow port of the primary classification device and the tailing outlet of the beneficiation device, and is used to receive the underflow product discharged from the underflow port and the beneficiated tailing product obtained by the beneficiation device and perform thickening separation on them to obtain a thickened concentrate product and a thickened tailing product; The inlet of the secondary grinding mill is connected to the concentrate outlet of the thickening beneficiation device, and is used to receive the thickened concentrate product obtained by the thickening separation device and perform secondary grinding on it; The outlet of the secondary grinding mill is connected to the inlet of the primary classification device, and is used to return the grinding product obtained by secondary grinding to the primary classification device for reclassification; The tailing treatment device is respectively connected to the tailing outlet of the thickening beneficiation device and the tailing outlet of the magnetic classification preselection, and is used to receive the thickened tailing product obtained by the thickening separation device and the separated tailing product obtained by the magnetic classification preselection and perform tailing treatment on them; The magnetic classification preselection device is provided with a coarse-grained outlet, and the coarse-grained outlet is connected to the inlet of the primary grinding mill, and is used to return the coarse-grained minerals obtained by the magnetic classification preselection device to the primary grinding mill for grinding to form a closed-circuit grinding and separation cycle; The magnetic classification pre-selection equipment includes: a particle size separation component and a magnetic separation component. Among them, the particle size separation component is used to separate the products after grinding according to the particle size of the ore to obtain fine-grained minerals and coarse-grained minerals; the coarse-grained outlet of the particle size separation component is connected to the inlet of the first-stage grinding mill, and is used to directly discharge the coarse-grained minerals and return them to the first-stage grinding mill for re-grinding; the inlet of the magnetic separation component is connected to the fine-grained outlet of the particle size separation component, and is used to receive the fine-grained minerals discharged by the particle size separation component, and perform magnetic separation on the fine-grained minerals according to the mineral magnetism to obtain magnetic minerals as the separated concentrate product and non-magnetic minerals as the separated tailings product; The first-stage grinding mill and / or the second-stage grinding mill is a ball mill.

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