Phased configuration method for grinding and dressing equipment in a newly built ore dressing plant

Abstract

The present invention relates to a phased configuration method for grinding and selecting equipment of a newly built ore dressing plant, including a main plant, a first-phase project equipment configuration and a second-phase project equipment configuration arranged in the main plant, characterized in that: the first-phase project equipment configuration includes a grinding bin, a belt conveyor unit, a closed-circuit grinding system composed of a ball mill and a cyclone, and the selection and arrangement of a magnetic separator unit, and the second-phase project equipment configuration also includes a closed-circuit grinding system C composed of a ball mill C and a cyclone C, a belt conveyor III, a belt conveyor IV, a belt feeder II, and a belt feeder III. The advantages of the present invention are: due to the adoption of the above equipment configuration, the plant investment is reduced, which is beneficial to production management, the first-phase project equipment configuration and the second-phase project equipment configuration are reasonably connected, and can be adjusted according to the production capacity of the first-phase project equipment configuration and the second-phase project equipment configuration, meeting the demand for expanding production capacity, and at the same time, the adaptability is strong and the plant investment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of construction of ore dressing plants in the iron and steel metallurgical industry, and is particularly directed to a phased configuration method for grinding and selection equipment of a newly built ore dressing plant. Background Art

[0002] In recent years, the price of iron ore has been high, and many iron ore dressing plants have begun to be newly built. The total scale of the main planning is more than 2 million t / a, which is called a large-scale dressing plant. However, due to the change of resources and the control of initial investment, it is generally divided into the first phase and the second phase according to the nature of the ore and the processing capacity. Usually, the high-grade ore is first mined in the early stage of planning, and the secondary ore is mined in the later stage. Therefore, the equipment configuration of the first phase and the second phase of the project construction is different in scale, and the mill selection is generally different, especially for magnetite. The amount of magnetic separation tailings before the first phase of the mill is small, and the amount of grinding is large. The amount of magnetic separation tailings before the second phase of the mill is large, and the amount of grinding is even smaller. This makes it difficult to design, select and arrange, and often leads to unreasonable design, too many mill models, and inconvenient production management. Summary of the invention

[0003] The present invention is aimed at the phased construction of the grinding and selecting section of a newly built ore dressing plant, especially the phased configuration of the grinding and selecting section equipment with different ore properties and processing capacities for the first and second phases of the project, to optimize the design, so that the equipment configuration design is more reasonable, the production and operation costs are reduced, and the management and maintenance are convenient.

[0004] The purpose of the present invention is achieved through the following process technology solutions:

[0005] A phased configuration method of a newly built ore dressing plant grinding and selection equipment of the present invention comprises a main plant, a first phase engineering equipment configuration and a second phase engineering equipment configuration arranged in the main plant, and is characterized in that:

[0006] The equipment configuration of the first phase project includes the selection and arrangement of a grinding bin, a belt conveyor unit, a closed-circuit grinding system consisting of a ball mill and a cyclone, and a magnetic separator unit. A plurality of discharge ports are provided at the lower part of the grinding bin. The belt conveyor unit includes a belt conveyor I, a belt conveyor II, and a belt feeder I. The belt conveyors I and II are arranged in double rows in parallel at the lower part of the discharge port, and the belt feeder I is arranged perpendicular to the belt conveyors I and II.

[0007] The closed-circuit grinding system composed of the ball mill and the cyclone group includes a one-stage closed-circuit grinding system A composed of the ball mill A and the cyclone A and a two-stage closed-circuit grinding system B composed of the ball mill B and the cyclone B. The center lines of the two are arranged perpendicular to the grinding bin. The receiving end of the belt feeder I is arranged on the left side of the belt conveyor I and the belt conveyor II. The discharging end of the belt feeder I is connected with the ball mill A of the closed-circuit grinding system A. The belt conveyor I and the belt conveyor II respectively feed the ball mill of the closed-circuit grinding system A. The closed-circuit grinding system A serves as a one-stage closed-circuit rough grinding system I, and the closed-circuit grinding system B serves as a two-stage closed-circuit fine grinding system I. The closed-circuit rough grinding system and the closed-circuit fine grinding system of the two-stage closed-circuit grinding system form a one-to-one configuration.

[0008] The magnetic separator unit includes a first-stage magnetic separator unit, a second-stage magnetic separator unit and a third-stage magnetic separator unit, and the overflow port of the cyclone A is connected to the slurry distributor of the first-stage magnetic separator unit through a pump I. As an embodiment, the first-stage magnetic separator unit uses four groups of magnetic separators, and the concentrate port of the first-stage magnetic separator unit is connected to the ore feeding port of the ball mill B of the second-stage closed-circuit fine grinding system I. The closed-circuit grinding system B is a two-stage closed-circuit fine grinding system. The overflow port of the cyclone B is connected to the slurry distributor of the second-stage magnetic separator unit through a gravity pump II, and the concentrate of the second-stage magnetic separator unit is connected to the third-stage magnetic separator unit through a slurry distributor;

[0009] The equipment configuration of the second phase project in the main plant also includes a closed-circuit grinding system C composed of a ball mill C and a cyclone C, a belt conveyor III, a belt conveyor IV, a belt feeder II and a belt feeder III. The closed-circuit grinding system C is arranged in the second-phase project space reserved on the other side of the closed-circuit grinding system B. The belt conveyor I uses a reversible belt conveyor I. The belt conveyor II is changed from a single belt conveyor to two reversible belt conveyors III and reversible belt conveyors IV arranged in a straight line. The receiving end of the belt feeder II is arranged on the belt conveyor. The belt feeder Ⅰ and the reversible belt conveyor Ⅳ are arranged on the right side, and the conveying direction of the reversible belt conveyor Ⅰ is changed at the same time, and the discharging end of the belt feeder Ⅱ is connected with the receiving port of the ball mill C of the closed circuit grinding system C, so that the belt conveyor Ⅰ and the reversible belt conveyor Ⅵ feed the ball mill C of the closed circuit grinding system C through the belt feeder Ⅱ; the receiving end of the belt feeder Ⅲ is arranged in the middle of the belt conveyor Ⅲ and the belt conveyor Ⅳ, and the discharging end of the belt feeder Ⅲ is connected with the ball mill B of the closed circuit grinding system B, and the ball mill B of the closed circuit grinding system B is fed through the belt feeder Ⅲ;

[0010] At this time, the closed-circuit grinding system C and the closed-circuit grinding system B are both used as the first stage of the closed-circuit coarse grinding system II of the second-phase project equipment configuration, and the closed-circuit coarse grinding system of the three-stage closed-circuit grinding system and the closed-circuit fine grinding system form a two-to-one configuration;

[0011] In the equipment configuration of the second phase project, the magnetic separator unit also includes a first-stage magnetic separator unit, a second-stage magnetic separator unit and a third-stage magnetic separator unit. The overflow ports of the cyclone B and the cyclone C of the first-stage closed-circuit rough grinding system II of the second phase project equipment are connected to the slurry distributor of the first-stage magnetic separator unit through gravity pump II and pump III respectively. At this time, there are six magnetic separators in the first-stage magnetic separator unit, and the concentrate port of the first-stage magnetic separator unit is connected to the ore feeding port of the ball mill A4 of the second-stage closed-circuit fine grinding system II. The overflow port of its cyclone A6 is connected to the slurry distributor of the second-stage magnetic separator unit through pump I, and the concentrate of the second-stage magnetic separator unit is connected to the third-stage magnetic separator unit through the slurry distributor; as an embodiment, five magnetic separators are selected for the second-stage magnetic separator unit and the third-stage magnetic separator unit.

[0012] Preferably, when configuring the equipment for the second phase project, the first stage closed-circuit coarse grinding system II and the second stage closed-circuit fine grinding system II use ball mills of different powers, and the power of ball mills B and ball mills C in the first stage closed-circuit coarse grinding system II is more than 1.3 times the power of ball mill A in the second stage closed-circuit fine grinding system II.

[0013] Preferably, when configuring the equipment for the second phase project, when the power ratio of the first-stage closed-circuit coarse grinding system II and the second-stage closed-circuit fine grinding system II is between 1.5-1.8, the specifications and models of the ball mill C of the added grinding system C should be consistent with the specifications and models of the ball mill A of the grinding system A; when the power ratio of the first-stage closed-circuit coarse grinding system II and the second-stage closed-circuit fine grinding system II is between 1.3-1.4, the specifications and models of the ball mill C of the added grinding system C should be consistent with the specifications and models of the ball mill B of the grinding system B.

[0014] Preferably, the first-phase project equipment is equipped with four magnetic separators, and the second-phase project equipment is equipped with six magnetic separators.

[0015] Preferably, the two-stage magnetic separator unit and the three-stage magnetic separator unit configured in the first-phase project equipment are three magnetic separators, and the two-stage magnetic separator unit and the three-stage magnetic separator unit configured in the second-phase project equipment are five magnetic separators.

[0016] The process characteristics of the invention are:

[0017] (1) The grinding bin of the present invention adopts a double-discharge belt conveyor arrangement, and the belt conveyor I is a reversible belt conveyor I, which can quickly switch to the ball mill C of the closed-circuit grinding system C for feeding;

[0018] (2) The equipment configuration of the first phase of the project of the present invention is that the closed-circuit coarse grinding system and the closed-circuit fine grinding system of the two-stage closed-circuit grinding system form a one-to-one configuration, which can meet the requirements of the first phase of mining high-grade ore;

[0019] (3) The equipment configuration of the second phase project of the present invention is that a closed-circuit grinding system C is added to the one-stage coarse grinding system II, and the closed-circuit coarse grinding system and the closed-circuit fine grinding system of the three-stage closed-circuit grinding system form a two-to-one configuration;

[0020] (4) When configuring the equipment for the two-phase project, during the power selection process of the ball mill, it can be adjusted according to the production capacity of the first and second phases, meeting the requirement that the first and second stages can be interchanged after the mill is selected, thus meeting the need to expand production capacity. At the same time, it has strong adaptability, reduces plant investment, and is conducive to production management. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the equipment configuration layout diagram of the first phase of the project of the present invention.

[0022] Figure 2 This is the equipment configuration layout diagram of the second phase project of the present invention. DETAILED DESCRIPTION

[0023] To describe the present invention, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0024] The example of the present invention is a new ore dressing plant project in a certain mine. According to the mining plan of the project, the overall scale is 9 million t / a, which is divided into two phases of construction. The construction scale of the first phase is 5.5 million t / a, mainly mining high-grade ore; the second phase construction is expanding the capacity by 4.5 million t / a, mining general grade ore, at this time the ore grade is low and the waste rock mixing rate is also high. According to experimental research, the first phase of 5.5 million t / a high-grade ore can throw out about 500,000 t / a of waste rock for pre-grinding pre-selection, and enter the first stage of rough grinding ore about 5 million t / a; when the final scale of the second phase reaches 9 million t / a, due to the deterioration of ore properties and the high waste rock mixing rate, the pre-grinding pre-selection can throw out about 1.8 million t / a of waste rock, that is, about 7.2 million t / a of the first stage of rough grinding ore, and the amount of grinding increased by 2.2 million t / a. According to the test results and the calculation and analysis of the grinding selection, when the first-stage grinding fineness is selected at -0.074mm55%, the specifications and power of the ball mill can meet the requirements of 5 million t / a for the first-stage grinding and 7.2 million t / a for the second-stage grinding, and the first-stage ball mill and the second-stage ball mill can be interchanged.

[0025] like Figure 1 As shown, a phased configuration method of a newly built ore dressing plant grinding and selection equipment of the present invention includes a main plant, a first-phase engineering equipment configuration and a second-phase engineering equipment configuration arranged in the main plant, and is characterized in that:

[0026] The configuration of the first phase project equipment includes a grinding bin, which is a flat-bottomed bin, a belt conveyor unit, a closed-circuit grinding system consisting of a ball mill and a cyclone, and the selection and arrangement of a magnetic separator unit. There are 12 discharge ports at the bottom of the grinding bin, two rows in total, and 6 discharge ports in each row. The belt conveyor unit includes a belt conveyor Ⅰ1, a belt conveyor Ⅱ2, and a belt feeder Ⅰ3. The belt conveyors Ⅰ1 and Ⅱ2 are arranged in parallel in double rows at the bottom of the discharge ports, and the belt feeder Ⅰ3 is arranged perpendicular to the belt conveyors Ⅰ1 and Ⅱ2.

[0027] The closed-circuit grinding system composed of a ball mill and a cyclone group includes a first-stage closed-circuit grinding system A composed of a ball mill A4 and a cyclone A6 and a second-stage closed-circuit grinding system B composed of a ball mill B5 and a cyclone B7. The center lines of the two are arranged perpendicular to the grinding bin. The receiving end of the belt feeder Ⅰ3 is arranged on the left side of the belt conveyor Ⅰ1 and the belt conveyor Ⅱ2. The discharging end of the belt feeder Ⅰ3 is connected with the ball mill A of the closed-circuit grinding system A. The ball mill A4 of the closed-circuit grinding system A is fed by the belt conveyor Ⅰ1 and the belt conveyor Ⅱ2 respectively. The closed-circuit grinding system A serves as a first-stage closed-circuit coarse grinding system Ⅰ, and the closed-circuit grinding system B serves as a second-stage closed-circuit fine grinding system Ⅰ. The closed-circuit coarse grinding system and the closed-circuit fine grinding system of the two-stage closed-circuit grinding system form a one-to-one configuration; the requirements for the first-phase mining of high-grade ores can be met.

[0028] The magnetic separator unit includes a first-stage magnetic separator unit 8, a second-stage magnetic separator unit 9 and a third-stage magnetic separator unit 10, and the overflow port of the cyclone A6 is connected to the slurry distributor of the first-stage magnetic separator unit 8 through a pump Ⅰ11. As an embodiment, the first-stage magnetic separator unit 8 uses four magnetic separators, and the concentrate port of the first-stage magnetic separator unit 8 is connected to the ore feeding port of the ball mill B5 of the second-stage closed-circuit fine grinding system Ⅰ. The closed-circuit grinding system B is a two-stage closed-circuit fine grinding system, and the overflow port of the cyclone B7 is connected to the slurry distributor of the second-stage magnetic separator unit 9 through a gravity pump Ⅱ13. The magnetic separators of the second-stage magnetic separator unit 9 and the third-stage magnetic separator unit 10 are three magnetic separators, and the concentrate of the second-stage magnetic separator unit 9 is connected to the third-stage magnetic separator unit 10 through a slurry distributor;

[0029] like Figure 2As shown, the equipment configuration of the second phase project also includes a closed-circuit grinding system C composed of a ball mill C15 and a cyclone C14, a belt conveyor III21, a belt conveyor IV22, a belt feeder II23 and a belt feeder III24. The closed-circuit grinding system C is arranged in the second-phase project space reserved on the other side of the closed-circuit grinding system B. The belt conveyor I1 uses a reversible belt conveyor I. The belt conveyor II is changed from a single belt conveyor to two reversible belt conveyors III21 and IV22 arranged in a straight line. The receiving end of the belt feeder II23 is arranged on the belt conveyor I. 1 and the right side of the reversible belt conveyor IV22, and at the same time, the conveying direction of the reversible belt conveyor I is changed, and the discharging end of the belt feeder II23 is connected with the receiving port of the ball mill C15 of the closed-circuit grinding system C, so that the belt conveyor I1 and the reversible belt conveyor VI22 feed the ball mill C15 of the closed-circuit grinding system C through the belt feeder II23; the receiving end of the belt feeder III24 is arranged between the belt conveyor III21 and the belt conveyor IV22, and the discharging end of the belt feeder III24 is connected with the ball mill B5 of the closed-circuit grinding system B, and the ball mill B5 of the closed-circuit grinding system B is fed through the belt feeder III24;

[0030] At this time, the closed-circuit grinding system C and the closed-circuit grinding system B are both used as the first stage of the closed-circuit coarse grinding system II of the second-phase project equipment configuration, and the closed-circuit coarse grinding system of the three-stage closed-circuit grinding system and the closed-circuit fine grinding system form a two-to-one configuration;

[0031] In the equipment configuration of the second phase project, the magnetic separator unit also includes a first-stage magnetic separator unit 8, a second-stage magnetic separator unit 9 and a third-stage magnetic separator unit 10. The overflow ports of the cyclone B7 and the cyclone C14 of the first-stage closed-circuit rough grinding system II of the second phase project equipment are connected to the slurry distributor of the first-stage magnetic separator unit 8 through gravity pumps II and pumps III, respectively. At this time, there are six magnetic separators in the first-stage magnetic separator unit, and the concentrate port of the first-stage magnetic separator unit 8 is connected to the ore feeding port of the ball mill A4 of the second-stage closed-circuit fine grinding system II. The overflow port of its cyclone A6 is connected to the slurry distributor of the second-stage magnetic separator unit 9 through pump I, and the concentrate of the second-stage magnetic separator unit 9 is connected to the third-stage magnetic separator unit 10 through the slurry distributor; as an embodiment, five magnetic separators are selected for the second-stage magnetic separator unit and the third-stage magnetic separator unit.

[0032] The first stage magnetic separator 8 of the magnetic separator in the second phase project equipment configuration is six magnetic separators, the second stage magnetic separator 9 and the third stage magnetic separator 10, the overflow port of the cyclone A6 is connected with the slurry distributor of the first stage magnetic separator 8 through the pump Ⅰ11. As an embodiment, the first stage magnetic separator 8 uses four magnetic separators, the concentrate port of the first stage magnetic separator 8 is connected with the feed port of the ball mill B5 of the second stage closed-circuit fine grinding system Ⅰ, the closed-circuit grinding system B is a two-stage closed-circuit fine grinding system, the overflow port of the cyclone B7 is connected with the slurry distributor of the second stage magnetic separator 9 through the gravity pump Ⅱ13, the magnetic separators of the second stage magnetic separator 9 and the third stage magnetic separator 10 are three magnetic separators, and the concentrate of the second stage magnetic separator 9 is connected with the third stage magnetic separator 10 through the slurry distributor;

[0033] When configuring the equipment for the second phase project of the present invention, the first stage closed-circuit coarse grinding system II and the second stage closed-circuit fine grinding system II select ball mills of different powers, and the power of the ball mills B5 and C15 of the first stage closed-circuit coarse grinding system II is more than 1.3 times the power of the ball mill A4 of the second stage closed-circuit fine grinding system II.

[0034] In the configuration of the equipment for the second phase project of the present invention, when the power ratio of the first stage closed-circuit coarse grinding system II to the second stage closed-circuit fine grinding system II is between 1.5-1.8, the specifications and models of the ball mill C15 added to the grinding system C shall be consistent with the specifications and models of the ball mill A4 of the grinding system A; when the power ratio of the first stage closed-circuit coarse grinding system II to the second stage closed-circuit fine grinding system II is between 1.3-1.4, the specifications and models of the ball mill C15 added to the grinding system C shall be consistent with the specifications and models of the ball mill B of the grinding system B.

[0035] The adoption of the above equipment configuration reduces plant investment and facilitates production management. The first and second phases are connected reasonably, arranged reasonably, and designed ingeniously, without affecting production.

Claims

1. A phased configuration method for grinding and selecting equipment of a newly built ore dressing plant, comprising a main plant, a first phase engineering equipment configuration and a second phase engineering equipment configuration arranged in the main plant, characterized in that: The equipment configuration of the first phase project includes the selection and arrangement of a grinding bin, a belt conveyor unit, a closed-circuit grinding system consisting of a ball mill and a cyclone, and a magnetic separator unit. A plurality of discharge ports are provided at the lower part of the grinding bin. The belt conveyor unit includes a belt conveyor I, a belt conveyor II, and a belt feeder I. The belt conveyors I and II are arranged in double rows in parallel at the lower part of the discharge port, and the belt feeder I is arranged perpendicular to the belt conveyors I and II. The closed-circuit grinding system composed of the ball mill and the cyclone group includes a one-stage closed-circuit grinding system A composed of the ball mill A and the cyclone A and a two-stage closed-circuit grinding system B composed of the ball mill B and the cyclone B. The center lines of the two are arranged perpendicular to the grinding bin. The receiving end of the belt feeder I is arranged on the left side of the belt conveyor I and the belt conveyor II. The discharging end of the belt feeder I is connected with the ball mill A of the closed-circuit grinding system A. The belt conveyor I and the belt conveyor II respectively feed the ball mill of the closed-circuit grinding system A. The closed-circuit grinding system A serves as a one-stage closed-circuit rough grinding system I, and the closed-circuit grinding system B serves as a two-stage closed-circuit fine grinding system I. The closed-circuit rough grinding system and the closed-circuit fine grinding system of the two-stage closed-circuit grinding system form a one-to-one configuration. The magnetic separator unit includes a first-stage magnetic separator unit, a second-stage magnetic separator unit and a third-stage magnetic separator unit, the overflow port of the cyclone A is connected to the slurry distributor of the first-stage magnetic separator unit through a pump I, the first-stage magnetic separator unit uses four groups of magnetic separators, the concentrate port of the first-stage magnetic separator unit is connected to the ore feeding port of the ball mill B of the second-stage closed-circuit fine grinding system I, the closed-circuit grinding system B is a two-stage closed-circuit fine grinding system, the overflow port of the cyclone B is connected to the slurry distributor of the second-stage magnetic separator unit through a gravity pump II, and the concentrate of the second-stage magnetic separator unit is connected to the third-stage magnetic separator unit through a slurry distributor; The equipment configuration of the second phase project also includes a closed-circuit grinding system C composed of a ball mill C and a cyclone C, a belt conveyor III, a belt conveyor IV, a belt feeder II and a belt feeder III. The closed-circuit grinding system C is arranged in the second-phase project space reserved on the other side of the closed-circuit grinding system B. The belt conveyor I uses a reversible belt conveyor I. The belt conveyor II is changed from a single belt conveyor to two reversible belt conveyors III and reversible belt conveyors IV arranged in a straight line. The receiving end of the belt feeder II is arranged on the belt conveyor. The belt feeder Ⅰ and the reversible belt conveyor Ⅳ are arranged on the right side, and the conveying direction of the reversible belt conveyor Ⅰ is changed at the same time, and the discharging end of the belt feeder Ⅱ is connected with the receiving port of the ball mill C of the closed circuit grinding system C, so that the belt conveyor Ⅰ and the reversible belt conveyor Ⅵ feed the ball mill C of the closed circuit grinding system C through the belt feeder Ⅱ; the receiving end of the belt feeder Ⅲ is arranged in the middle of the belt conveyor Ⅲ and the belt conveyor Ⅳ, and the discharging end of the belt feeder Ⅲ is connected with the ball mill B of the closed circuit grinding system B, and the ball mill B of the closed circuit grinding system B is fed through the belt feeder Ⅲ; At this time, the closed-circuit grinding system C and the closed-circuit grinding system B are both used as the first stage of the closed-circuit coarse grinding system II of the second-phase project equipment configuration, and the closed-circuit coarse grinding system of the three-stage closed-circuit grinding system and the closed-circuit fine grinding system form a two-to-one configuration; In the equipment configuration of the second phase project, the magnetic separator units also include a first-stage magnetic separator unit, a second-stage magnetic separator unit and a third-stage magnetic separator unit. The overflow ports of the cyclone B and the cyclone C of the first-stage closed-circuit rough grinding system II of the second phase project equipment are connected to the slurry distributor of the first-stage magnetic separator unit through gravity pumps II and pumps III respectively. At this time, there are six magnetic separators in the first-stage magnetic separator unit. The concentrate port of the first-stage magnetic separator unit is connected to the ore feeding port of the ball mill A of the second-stage closed-circuit fine grinding system II, and the overflow port of its cyclone A is connected to the slurry distributor of the second-stage magnetic separator unit through pump I. The concentrate of the second-stage magnetic separator unit is connected to the slurry distributor of the third-stage magnetic separator unit through the slurry distributor; the second-stage magnetic separator unit and the third-stage magnetic separator unit use five magnetic separators.

2. The phased configuration method for the grinding and selecting equipment of a newly built ore dressing plant according to claim 1 is characterized in that: When configuring the equipment for the second phase project, the first stage closed-circuit coarse grinding system II and the second stage closed-circuit fine grinding system II use ball mills of different powers. The power of ball mills B and C in the first stage closed-circuit coarse grinding system II is more than 1.3 times that of ball mill A in the second stage closed-circuit fine grinding system II.

3. The phased configuration method of the grinding and selecting equipment of a newly built ore dressing plant according to claim 1 is characterized in that: When configuring the equipment for the second phase project, when the power ratio of the first stage closed-circuit coarse grinding system II and the second stage closed-circuit fine grinding system II is between 1.5-1.8, the specifications and models of the ball mill C of the added grinding system C shall be consistent with the specifications and models of the ball mill A of the grinding system A; when the power ratio of the first stage closed-circuit coarse grinding system II and the second stage closed-circuit fine grinding system II is between 1.3-1.4, the specifications and models of the ball mill C of the added grinding system C shall be consistent with the specifications and models of the ball mill B of the grinding system B.

4. The phased configuration method of the grinding and selecting equipment of a newly built ore dressing plant according to claim 1 is characterized in that: The first-phase project equipment is equipped with four magnetic separators, and the second-phase project equipment is equipped with six magnetic separators.

5. The phased configuration method of the grinding and selecting equipment of a newly built ore dressing plant according to claim 1 is characterized in that: The two-stage magnetic separator set and the three-stage magnetic separator set configured in the first-phase project equipment are three magnetic separators, and the two-stage magnetic separator set and the three-stage magnetic separator set configured in the second-phase project equipment are five magnetic separators.

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