Method for removing iron impurities in minerals through manual and automatic three-stage combination in magnet mineral separation

Abstract

The invention belongs to the technical field of magnetite beneficiation, and particularly relates to a method for removing iron impurities in minerals through manual and automatic three-stage combination in magnet beneficiation, a three-stage iron removal system is arranged, the iron impurities and ferromanganese are detected step by step according to the size of the iron impurities and the property of magnets or ferromanganese, and a detected magnetic field is cooperatively calibrated step by step; and iron impurities in the ores are removed in a classified manner. Compared with the prior art, the system has the beneficial effects that a manual and automatic three-stage combined iron removal solution is adopted, large magnetic iron impurities, small magnetic iron impurities and ferromanganese impurities in the process are efficiently classified and removed in a targeted manner, damage of the iron impurities to equipment such as an ore crusher and a belt conveyor is avoided, the operation efficiency of the process is improved, and the production cost is reduced. And the problem of removing iron impurities in magnet beneficiation is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetite beneficiation, and in particular relates to a manual and automatic three-stage combined method for removing iron impurities in minerals during magnetite beneficiation. Background Art

[0002] Minerals are the main raw materials for processing in mining enterprises. During the processing of minerals, iron impurities in the minerals will have a serious impact on the process. Therefore, the removal of iron impurities is an important research content in mineral processing. At present, the most widely used and most effective method is to use magnetic separation and iron removal to automatically remove iron impurities in minerals. The application effect is good in non-metallic mineral processing, but in magnetic iron ore dressing, due to the high ferromagnetic rate of minerals, it has a great impact on the detection and removal of iron impurities, and the iron removal effect is not good. At present, there is no efficient method for removing iron impurities in magnetic ore dressing. Iron impurities enter the ore dressing and crushing process, which will cause certain damage to crushers, belt conveyors and other equipment, affecting the stability of the crushing process.

[0003] In the large-scale crushing process of the ore dressing plant of a large steel plant, the incoming ore raw materials are often accompanied by iron impurities, including magnetic impurities and ferromanganese impurities. Although two magnetic separation automatic iron removers are installed on the crusher feed belt, the iron removal effect is not good. The specific situation is as follows:

[0004] 1. Due to the large ore particle size and high ferromagnetic rate of the mining industry, ore splashing will occur during the operation of the iron remover. Frequent operation of the iron remover will cause excessive stone splashing, which will damage the belt conveyor and cause the equipment to stop. When the magnetic field of the iron remover is calibrated to be strong, there will be too many false operations and frequent operations, causing excessive ore splashing, affecting the operation of the host equipment. When the magnetic field of the iron remover is calibrated to be weak, it cannot effectively remove small pieces of iron impurities. The single operation time of the automatic iron remover is too long. When the iron detector detects an iron signal, the iron remover starts to operate immediately, and the iron has not yet reached the iron remover position. 3 / 4 of the operation time is invalid, which causes ore splashing.

[0005] 2. Manganese iron often appears in the process, and the iron remover system cannot detect and remove it. The iron removal system cannot effectively remove the iron impurities in the ore. Crusher iron smelting often occurs, causing wear of the liner iron and straight mouth. In severe cases, it can cause the crusher anchor screws to break. Some iron impurities pass through the crusher into the lower process belt conveyor, causing scratches on the belt conveyor, seriously affecting the stability of the process operation. Therefore, a method is urgently needed to effectively remove the iron impurities in the ore to ensure stable operation of the equipment and process. Summary of the Invention

[0006] The present invention provides a method for removing iron impurities from minerals in magnetite beneficiation by combining manual and automatic three-stage removal. Through a comprehensive solution of multi-stage combined iron removal, the iron impurities in magnetite or ferromanganese in the process can be effectively removed, ensuring the stable operation of the equipment and the process.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for removing iron impurities from ore by combining manual and automatic three-stage combination in magnet beneficiation is provided. A three-stage iron removal system is provided. According to the size of the iron impurities and the properties of the magnet or ferromanganese, the iron impurities and ferromanganese are detected step by step. The detection magnetic field is collaboratively calibrated according to the level to remove the iron impurities from the ore by category. The method specifically includes the following steps:

[0009] 1) The first-stage iron removal system adopts a magnetic separation automatic iron removal device, which is installed at the front end of the medium crushing feed belt. The magnetic field calibration for detecting iron impurities is physical calibration, and the calibration size of iron impurities is 80-90mm.

[0010] 2) The second-stage iron removal system uses manual ferromanganese removal and adopts an iron detector with ferromanganese detection function. It is installed after the first-stage iron removal system and before the crusher. The magnetic field calibration of the iron impurities by the iron detector with ferromanganese detection function is the same as that of the first-stage iron removal system. After the iron detector with ferromanganese detection function detects the ferromanganese detection signal, the detected ferromanganese detection signal is connected to the DCS system. The DCS system controls the belt to stop, locates the iron picking point, and manually picks up the iron.

[0011] 3) The third iron removal system uses a magnetic separation automatic iron removal device, installed on the belt after the crusher. The magnetic field calibration for detecting iron impurities is based on physical calibration, and the iron impurity size is calibrated to 30-50mm. The magnetic field is adjusted slightly higher than that of the first two iron removal systems to automatically remove smaller iron impurities in the ore. Since the particle size of the ore after the crusher is less than 90mm, the iron removal process will not cause excessive mineral splashing.

[0012] The particle size of the ore entering the first-stage iron removal system is ≤350mm.

[0013] The first-stage iron removal system includes a first-stage magnetic iron detector and a first-stage magnetic iron remover. The control logic of the first-stage iron removal system is: after the first-stage magnetic iron detector detects an iron signal, the first-stage magnetic iron remover is started when the iron impurities walk under the first-stage magnetic iron remover. The running time of each operation is no more than 4 seconds, which reduces the running time each time and significantly reduces the splash of ore.

[0014] In the second-stage iron removal system, the iron detector with ferromanganese detection function detects the ferromanganese detection signal and stops the feeding belt after a delay of 4 to 6 seconds. This effectively prevents accumulation of goods at the belt chute and issues an iron overload warning at the control room operation station.

[0015] The second-stage iron removal system has a locking logic added to the control system. When it detects that the belt operation box selection switch has switched from "remote to stop, and then from stop to remote", it releases the lock and allows startup to ensure the safety and effectiveness of manual iron removal.

[0016] The particle size of the ore entering the third iron removal system after being crushed by the crusher is less than 90 mm.

[0017] The third iron removal system includes a third-stage magnet iron detector and a third-stage magnet iron remover. The control logic of the third-stage magnet iron removal system is: after the third-stage magnet iron detector detects an iron signal, the third-stage magnet iron remover is started when the iron impurities walk under the third-stage magnet iron remover, and each operation lasts no more than 4 seconds.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention adopts a manual + automatic three-stage combined iron removal solution, which can effectively classify and remove large magnetic iron impurities, small magnetic iron impurities, and ferromanganese impurities in the process, avoid the damage of iron impurities to crushers, belt conveyors and other equipment, improve the operation efficiency of the process, and solve the problem of removing iron impurities in magnet ore dressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a process diagram of the present invention.

[0021] In the figure: 1. Coarse ore bin; 2. Heavy-duty vibrating feeder; 3. First-stage magnetic iron detector; 4. First-stage magnetic iron remover; 5. Iron detector with ferromanganese detection function; 6. Iron picking point; 7. Secondary crushing feed belt; 8. Vibrating feeder; 9. Crusher; 10. Third-stage magnetic iron detector; 11. Third-stage magnetic iron remover; 12. Secondary crushing discharge belt. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0023] A method for removing iron impurities from ore by combining manual and automatic three-stage combination in magnet beneficiation is provided. A three-stage iron removal system is provided. According to the size of the iron impurities and the properties of the magnet or ferromanganese, the iron impurities and ferromanganese are detected step by step. The detection magnetic field is collaboratively calibrated according to the level to remove the iron impurities from the ore by category. The method specifically includes the following steps:

[0024] 1) The particle size of the incoming ore for the first-stage iron removal system is ≤350mm. The first-stage iron removal system utilizes a magnetic separation automatic iron removal device, installed at the front end of the secondary crushing feed belt. It includes a first-stage magnetic iron detector 3 and a first-stage magnetic iron remover 4. The magnetic field for detecting iron impurities is calibrated based on physical objects, with the calibrated size of the iron impurities being 80-90mm. The first-stage iron removal system's magnetic field for detecting iron impurities is calibrated to a relatively weak level, primarily used to detect and remove larger magnetic impurities. This prevents malfunctions caused by interference from the mineral's ferromagnetism with the detection signal, significantly reducing the number of operations of the first-stage magnetic iron remover 4 and thereby reducing ore splash.

[0025] The control logic of the first-stage iron removal system is as follows: after the first-stage magnetic iron detector 3 detects an iron signal, the first-stage magnetic iron remover 4 is activated when the iron impurities pass under it, and each operation lasts no more than 4 seconds. The original iron removal device began operating upon detecting the iron signal, and each operation lasted 14 seconds. The above design of the present invention reduces each operation time and significantly reduces the ore splash caused by it.

[0026] The first-stage iron removal system is mainly used to remove larger magnetic impurities. By calibrating the weak magnetism of the detection signal, it reduces false operations and the number of operations. By optimizing the action logic of the iron removal system, it reduces the single operation time of the iron remover. While effectively removing larger magnetic impurities, it also reduces the action time of the iron remover to a minimum, thereby minimizing ore splashing and not affecting the stable operation of the equipment.

[0027] 2) The second-stage iron removal system adopts manual ferromanganese removal and adopts an iron detector 5 with a ferromanganese detection function. It is installed after the first-stage iron removal system and before the crusher 9. The magnetic field calibration of the iron impurities by the iron detector 5 with the ferromanganese detection function is the same as that of the first-stage iron removal system. The iron detector 5 with the ferromanganese detection function connects the detected ferromanganese detection signal to the DCS system. The DCS system controls the belt to stop and locate the iron picking point 6. The control room operation station issues an iron passing prompt, and the on-site manual personnel go to the predetermined iron picking point 6 to pick up the iron.

[0028] In the second-stage iron removal system, the iron detector 5 with ferromanganese detection function detects the ferromanganese detection signal and stops the feeding belt after a delay of 4 to 6 seconds. This effectively prevents accumulation of goods at the belt chute and the control room operation station issues an iron overload warning.

[0029] In the second-level iron removal system, the control system adds locking logic. When it detects that the belt operation box selection switch has changed from "remote to stop, and then from stop to remote", it releases the lock and allows startup to ensure the safety and effectiveness of manual iron removal.

[0030] Generally, ferromanganese impurities are “shovel tips” and other objects in the mining process. When using the iron detector 5 with ferromanganese detection function for detection, the actual object is used for calibration to achieve effective detection and avoid false operation.

[0031] In the first-stage to second-stage iron removal system, larger magnetic impurities are automatically removed by the first-stage magnetic iron remover 4. When ferromanganese impurities appear, since the first-stage magnetic iron detector 3 in the first-stage iron removal system does not have the function of detecting ferromanganese, the first-stage iron removal system does not operate. The iron detector 5 with ferromanganese detection function of the second-stage iron removal system sends a signal, and the signal is connected to the DCS system. The DCS controls the belt to stop, locates the iron picking point, and manually picks up the iron. The second-stage iron detector 5 with ferromanganese detection function calibrates the magnetic field of iron debris in the same way as the first stage. Therefore, smaller-sized magnetic iron impurities can be avoided in the second-stage iron removal system, avoiding excessive shutdowns and reduced operating efficiency.

[0032] 3) After crushing in the crusher 9, the ore entering the third iron removal system has a particle size of less than 90 mm. This third iron removal system uses a magnetic separation automatic iron removal device, including a third-stage magnetic iron detector 10 and a third-stage magnetic iron remover 11. These are installed on the secondary crushing feed belt 7 after the crusher 9. The magnetic field calibration for detecting iron impurities is physical calibration, and the calibrated size of iron impurities is 30-50 mm.

[0033] The third-stage iron removal system calibrates the magnetic field of iron impurities to be stronger, slightly higher than the first two-stage iron removal systems, and is used to automatically remove smaller iron impurities in the mineral. Since the particle size of the mineral after being crushed by the crusher 9 is less than 90mm, the iron removal process will not cause excessive mineral splashing.

[0034] The control logic for the third-stage iron removal system is as follows: After the third-stage magnetic iron detector 10 detects the presence of iron, the third-stage magnetic iron remover 11 is activated when the iron impurities pass under it. Each operation lasts no longer than four seconds. The optimization of the third-stage iron removal system control logic is similar to the first stage, minimizing the single operation time of the iron removal system.

[0035] The present invention achieves a stable and efficient iron removal effect through the coordinated calibration of magnetic separation of a three-stage iron removal system and optimization of control logic.

[0036] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A three-stage combined manual and automatic method for removing iron impurities from minerals in magnet beneficiation, characterized in that: A three-stage iron removal system is set up to detect iron and ferromanganese in each stage, and the detection magnetic field is calibrated in coordination according to the stage to remove iron impurities in the ore by category. The specific steps include the following: 1) The first-stage iron removal system adopts a magnetic separation automatic iron removal device, which is installed at the front end of the secondary crushing feed belt. The magnetic field calibration for detecting iron impurities is physical calibration, and the calibration size of iron impurities is 80-90mm; 2) The second-stage iron removal system uses an iron detector with ferromanganese detection function. It is installed after the first-stage iron removal system and before the crusher. The magnetic field calibration of the iron impurities by the iron detector with ferromanganese detection function is the same as that of the first-stage iron removal system. After the iron detector with ferromanganese detection function detects the ferromanganese detection signal, the belt stops, the iron picking point is located, and the iron is picked up manually; 3) The third iron removal system uses a magnetic separation automatic iron removal device, which is installed on the belt after the crusher. The magnetic field calibration for detecting iron impurities is physical calibration, and the calibration size of iron impurities is 30-50mm.

2. The method for removing iron impurities from minerals by combining manual and automatic three-stage separation in magnet beneficiation according to claim 1, characterized in that: The particle size of the ore entering the first-stage iron removal system is ≤350mm.

3. The method for removing iron impurities from minerals by combining manual and automatic three-stage separation in magnet beneficiation according to claim 1, characterized in that: The first-stage iron removal system includes a first-stage magnet iron detector and a first-stage magnet iron remover. The control logic of the first-stage iron removal system is: after the first-stage magnet iron detector detects an iron signal, the first-stage magnet iron remover is started when the iron impurities walk under the first-stage magnet iron remover, and each operation lasts no more than 4 seconds.

4. The method for removing iron impurities from minerals by combining manual and automatic three-stage separation in magnet beneficiation according to claim 1, characterized in that: In the second-stage iron removal system, the iron detector with ferromanganese detection function detects the ferromanganese detection signal and stops the feeding belt after a delay of 4 to 6 seconds.

5. The method for removing iron impurities from minerals by combining manual and automatic three-stage separation in magnet beneficiation according to claim 1, characterized in that: The control system of the second-stage iron removal system is added with a locking logic. When it detects that the belt operation box selection switch has changed from "remote to stop and then from stop to remote", the locking is released and the start is allowed.

6. The method for removing iron impurities from minerals by combining manual and automatic three-stage separation in magnet beneficiation according to claim 1, characterized in that: The particle size of the ore entering the third iron removal system after being crushed by the crusher is less than 90 mm.

7. The method for removing iron impurities from minerals by combining manual and automatic three-stage separation in magnet beneficiation according to claim 1, characterized in that: The third iron removal system includes a third-stage magnet iron detector and a third-stage magnet iron remover. The control logic of the third-stage magnet iron removal system is: after the third-stage magnet iron detector detects an iron signal, the third-stage magnet iron remover is started when the iron impurities walk under the third-stage magnet iron remover, and each operation lasts no more than 4 seconds.

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