Feeding system and method for wet and sticky ore

Abstract

The invention provides a feeding system and method for wet and sticky ores, which comprises the following steps: a pre-grinding bin conveys the ores to a belt weigher through a bottom chute, the inner wall of the bottom chute is provided with a lining plate, and the friction coefficient of the lining plate is 0.05-0.15; the belt weigher is used for conveying ores to the discharging chute; a lining plate is arranged on the inner wall of the discharging chute. In the feeding process, the controller is used for obtaining the bin wall pressure and the material level height change rate of the pre-grinding bin; when it is determined that the bin wall pressure is larger than a preset pressure threshold value and / or it is determined that the material level height change rate is abnormal, a vibrator is controlled to vibrate the corresponding area of the pre-grinding bin; thus, in the feeding process, if the controller determines that the bin wall pressure and / or the material level height change rate are / is abnormal, the vibrator is automatically controlled to vibrate the corresponding area of the pre-grinding bin, rapid dredging can be achieved, the discharging stability and the ore grinding efficiency are improved, the invalid vibration frequency is reduced, and equipment abrasion and energy consumption are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ore pretreatment, and in particular to a feeding system and method for wet sticky ore. BACKGROUND

[0002] Stable and continuous feeding of bauxite is a prerequisite for smooth operation of the entire production system.

[0003] However, in the actual production process, the following problems are prone to occur: first, adhesion and piling of the ore in the bin: wet sticky ore no longer flows freely in the pre-mill bin and is prone to adhere to the bin wall or form unstable arches. Second, the feeder is blocked. The above problems cause the ore entering the wet mill to be clumped due to adhesion, unevenly mixed with alkali, and poor flowability. Third, the ore entering the wet mill is clumped due to adhesion, unevenly mixed with alkali, and poor flowability, resulting in large fluctuations in mill load, uneven particle size of the mill discharge, and reduced grinding efficiency.

[0004] Therefore, there is an urgent need for a feeding method and system suitable for wet sticky ore to achieve stable feeding and improve grinding efficiency. SUMMARY

[0005] To solve or partially solve the technical problem that the prior art cannot stably feed ore with high moisture and high viscosity, thereby affecting the grinding efficiency, the embodiments of the present application provide a feeding system and method for wet sticky ore.

[0006] In a first aspect, the present application provides a feeding system for wet sticky ore, the system comprising: a pre-mill bin, a belt scale, a feeding chute, a slurry mill, and a controller. The pre-mill bin is used to store ore and deliver the ore to the belt scale through a bottom chute, the inner wall of the bottom chute is provided with a liner plate, and the friction coefficient of the liner plate is 0.05-0.15. The belt scale is used to continuously weigh the ore delivered by the pre-mill bin and deliver the weighed ore to the feeding chute. The inner wall of the feeding chute is provided with the liner plate. The slurry mill is used to grind the ore; wherein, The pre-mill bin is provided with a pressure sensor and a level gauge; during feeding, the controller is configured to: Obtain the bin wall pressure and the rate of change of the level height of the pre-mill bin; When it is determined that the bin wall pressure is greater than a predetermined pressure threshold and / or that the rate of change of the level height is abnormal, the controller controls the rapping device to rap the corresponding area of the pre-mill bin.

[0007] In the scheme, the material of the lining plate is an ultra-high molecular weight polyethylene plate.

[0008] In the scheme, the system further comprises a plurality of pressure sensors, each of which is installed in a corresponding area of the outer wall of the pre-mill bin.

[0009] In the scheme, the system further comprises an electromagnetic vibrator, which is installed at the bottom chute of the pre-mill bin and the discharge chute.

[0010] In the scheme, the controller is specifically configured to When it is determined that the single-area pressure of the bin wall is greater than a preset first pressure threshold, the controller controls the corresponding area of the rapping device to start a strong rapping mode, and controls the rapping device of the corresponding area to be turned on for a first preset time length.

[0011] In the scheme, the controller is specifically configured to When it is determined that the multi-area pressure of the bin wall is greater than a preset second pressure threshold, the controller controls the corresponding area of the rapping device to be rapped in a cyclic manner in the order of pressure from small to large, and controls the corresponding area of the rapping device to be rapped in the order of amplitude from small to large in each cycle.

[0012] In the scheme, the controller is specifically configured to When it is determined that the material level rising rate or the material level falling rate in the pre-mill bin is abnormal, the controller determines the current height of the material level and controls the rapping device corresponding to the area where the current height is located to be continuously rapped at a preset frequency and amplitude.

[0013] In the scheme, the controller is specifically configured to When it is determined that the material level height in the pre-mill bin exceeds a height threshold and the duration is greater than a preset time threshold, the controller controls the rapping device of the corresponding area to be rapped in an intermittent vibration mode.

[0014] In the scheme, the controller is specifically configured to When it is determined that the bin wall pressure is greater than a preset pressure threshold and it is determined that the material level height change rate is abnormal, the controller controls the rapping device of the corresponding area to be rapped at full power and controls the electromagnetic vibrator at the bottom chute of the pre-mill bin and the discharge chute to be turned on.

[0015] In a second aspect of the present application, a method for feeding wet sticky ore is provided, which is applied in the system of any one of the first aspect, and the method comprises: obtaining the bin wall pressure and the material level height change rate of the pre-mill bin; When it is determined that the bin wall pressure is greater than a preset pressure threshold and / or it is determined that the material level height change rate is abnormal, the controller controls the rapping device to rap the corresponding area of the pre-mill bin.

[0016] The application provides a wet sticky ore feeding system and method, which comprises a pre-mill bin, a belt scale, a discharging chute, a slurry mill and a controller; the pre-mill bin is used for storing ores and conveying the ores to the belt scale through a bottom chute, an inner wall of the bottom chute is provided with a lining plate, and a friction coefficient of the lining plate is 0.05-0.15; the belt scale is used for continuously weighing the ores conveyed by the pre-mill bin and conveying the weighed ores to the discharging chute; an inner wall of the discharging chute is provided with the lining plate; the slurry mill is used for grinding the ores; wherein the pre-mill bin is provided with a pressure sensor and a level gauge; during the feeding process, the controller is used for acquiring a bin wall pressure and a change rate of a level height of the pre-mill bin; when it is determined that the bin wall pressure is greater than a preset pressure threshold value and / or the change rate of the level height is abnormal, the controller controls a rapping device to rap a corresponding area of the pre-mill bin; in this way, the lining plates with low surface friction coefficients are arranged on the inner wall of the bottom chute and the inner wall of the discharging chute, the smoothness in the ore conveying process is improved, and during the feeding process, if the controller determines that the bin wall pressure and / or the change rate of the level height is abnormal, the controller automatically controls the rapping device to rap the corresponding area of the pre-mill bin, so that the ores can be quickly dredged, the stability of discharging and the ore grinding efficiency are improved, the number of invalid rapping is reduced, and the equipment wear and energy consumption are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the various drawings to designate the same or similar parts. In the drawings: Figure 1 Fig. 1 shows a schematic diagram of the overall structure of the wet sticky ore feeding system according to one embodiment of the application; Figure 2 Fig. 2 shows a schematic diagram of the feeding method of the wet sticky ore according to one embodiment of the application. DETAILED DESCRIPTION

[0018] Exemplary embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings. Although 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. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0019] The application provides a wet sticky ore feeding system, which comprises a pre-mill bin, a belt scale, a discharging chute, a slurry mill and a controller; the pre-mill bin is used for storing ores and conveying the ores to the belt scale through a bottom chute, an inner wall of the bottom chute is provided with a lining plate, and a friction coefficient of the lining plate is 0.05-0.15; the belt scale is used for continuously weighing the ores conveyed by the pre-mill bin and conveying the weighed ores to the discharging chute; an inner wall of the discharging chute is provided with the lining plate; the slurry mill is used for grinding the ores; wherein the pre-mill bin is provided with a pressure sensor and a level gauge; during the feeding process, the controller is used for acquiring a bin wall pressure and a change rate of a level height of the pre-mill bin; when it is determined that the bin wall pressure is greater than a preset pressure threshold value and / or the change rate of the level height is abnormal, the controller controls a rapping device to rap a corresponding area of the pre-mill bin; in this way, the lining plates with low surface friction coefficients are arranged on the inner wall of the bottom chute and the inner wall of the discharging chute, the smoothness in the ore conveying process is improved, and during the feeding process, if the controller determines that the bin wall pressure and / or the change rate of the level height is abnormal, the controller automatically controls the rapping device to rap the corresponding area of the pre-mill bin, so that the ores can be quickly dredged, the stability of discharging and the ore grinding efficiency are improved, the number of invalid rapping is reduced, and the equipment wear and energy consumption are reduced. Figure 1As shown, the system includes: a pre-grinding chamber 1, a belt scale 2, a discharge chute 3, a slurry mill 4, and a controller ( Figure 1 (not shown in the image) The pre-grinding chamber 1 stores ore and transports it to the belt scale 2 via a bottom chute. The inner wall of the bottom chute is lined with a liner 5 made of ultra-high molecular weight polyethylene (UHMWPE). The liner has a friction coefficient of 0.05~0.15, providing excellent self-lubrication and ensuring smoother material transport, preventing material adhesion and stagnation, and guaranteeing continuous material delivery. Furthermore, the liner has high wear resistance, effectively resisting friction and wear, extending the service life of equipment components, and significantly reducing wear on the bottom chute.

[0020] The belt scale 2 is used to continuously weigh the ore conveyed in the pre-milling chamber 1, realize the measurement and control of ore flow, and provide accurate measurement data for the subsequent slurry mill feed. The belt scale 2 conveys the weighed ore to the discharge chute 3; the inner wall of the discharge chute 3 is also equipped with the aforementioned liner 5.

[0021] The slurry mill 4 is used to grind the ore into a slurry to meet the requirements of subsequent production processes.

[0022] However, in actual production, due to the high moisture content and viscosity of the ore, the wet, sticky ore no longer flows freely within the pre-milling chamber 1. It easily adheres to the chamber walls or forms unstable material arches. Even with frequent activation of the vibrator, the effect gradually decreases, and local compaction may occur due to the fixed vibration point, ultimately leading to flow interruption. Similarly, from the opening of the pre-milling chamber 1 to the belt scale 1, wet ore adheres to the bottom chute, causing blockages and resulting in huge fluctuations in the feed rate, making it impossible to maintain the set feed rate.

[0023] Therefore, in order to achieve stable material feeding, a pressure sensor and a level gauge are also installed in the pre-grinding chamber 1; during the feeding process, the controller is used for: Obtain the rate of change of the wall pressure and material level in the pre-grinding chamber; When it is determined that the pressure on the silo wall is greater than the preset pressure threshold and / or the rate of change of the material level is abnormal, the vibrator is controlled to vibrate the corresponding area of ​​the pre-grinding silo.

[0024] Specifically, the pressure sensor comprises multiple sensors, each installed in a corresponding area on the outer wall of the pre-grinding chamber. This invention divides the pre-grinding chamber into upper, middle, and lower areas, with the same number of pressure sensors installed in each area, forming a three-dimensional pressure distribution. During feeding, the pressure sensors in each area can be used to collect the corresponding pressure of the chamber wall. Furthermore, a level gauge is installed inside the pre-grinding chamber to collect the material level height during feeding.

[0025] The controller can receive the silo wall pressure sent by the pressure sensor and the material level height sent by the level gauge. When it is determined that the silo wall pressure is greater than the preset pressure threshold and / or the material level height change rate is abnormal, the controller controls the vibrator to vibrate the corresponding area of ​​the pre-grinding silo.

[0026] Furthermore, in order to improve material flow efficiency, the system also includes electromagnetic vibrators, which are installed at the bottom chute of the pre-grinding chamber and at the discharge chute. In certain scenarios, the electromagnetic vibrators and the aforementioned shock absorbers can work together to ensure that the material flow path is smooth throughout.

[0027] The vibrating device mentioned in this invention can be an ultrasonic cannon array, which includes multiple ultrasonic cannon sub-arrays, divided into an upper ultrasonic cannon sub-array, a middle ultrasonic cannon array, and a lower ultrasonic cannon array; each ultrasonic cannon sub-array can independently receive control commands and perform vibrating actions.

[0028] The upper ultrasonic sub-array corresponds to the upper region of the pre-grinding chamber, the middle ultrasonic sub-array corresponds to the middle region of the pre-grinding chamber, and the lower ultrasonic sub-array corresponds to the lower region of the pre-grinding chamber.

[0029] During the feeding process, when the controller determines that the pressure in a single area of ​​the bin wall is greater than the preset first pressure threshold, it controls the vibrator in the corresponding area to start the strong vibration mode and controls the vibrator in the corresponding area to start for a first preset duration.

[0030] Specifically, the first pressure threshold can be determined according to the actual situation, for example, it can be 0.6~0.7MPa, and there is no limitation here. When the controller determines that the pressure in a single area of ​​the silo wall (upper area, middle area, or lower area) is greater than the preset first pressure threshold and the pressure in the remaining areas is normal, it indicates that the single-point pressure is too high and local arching may occur. In this case, it is necessary to control the ultrasonic sub-array corresponding to the area with excessive pressure to activate the strong vibration mode and control the ultrasonic sub-array to activate for a first preset duration. The strong vibration mode is characterized by an amplitude of 50~100μm, a frequency stable at 20–30kHz, and a first preset duration of 20~30s.

[0031] For example, if it is determined that the pressure of the upper region wall is greater than the preset first pressure threshold and the pressure of the middle and lower regions is normal, then it is necessary to control the ultrasonic sub-array in the upper region to start the strong vibration mode and control the ultrasonic sub-array to start for the first preset duration.

[0032] When the controller determines that the pressure in multiple areas of the silo wall is greater than the preset second pressure threshold, it controls the vibrators in the corresponding areas to perform cyclic vibration in order of increasing pressure. During each cycle of vibration, the vibrators in the corresponding areas are controlled to vibrate in order of increasing amplitude.

[0033] The second pressure threshold can be determined according to the actual situation, for example, it can be 0.5 MPa. When the controller determines that the pressure in multiple areas of the silo wall (at least two areas of the upper, middle or lower area) is greater than the preset second pressure threshold, it indicates that a large-area arching phenomenon may occur, and the multi-area rotating vibration mode needs to be activated.

[0034] The multi-zone rotating vibration mode can be: the vibration devices in the corresponding zones are controlled in sequence according to the order of increasing zone pressure to perform cyclic vibration, and the vibration is performed in the manner of increasing amplitude in each cycle.

[0035] For example, if the pressure in the upper, middle, and lower regions all exceed the second pressure threshold, and the pressure in the upper region is less than that in the middle region, and the pressure in the middle region is less than that in the lower region, then the vibration is performed sequentially in the order of upper region first, then middle region, and finally lower region. During each cycle, the vibration amplitude in the upper region is less than that in the middle region, and the vibration amplitude in the middle region is less than that in the lower region. The preset number of vibration cycles can be set according to actual conditions, and the duration of each vibration cycle can also be set according to actual conditions; there are no restrictions here.

[0036] In this way, a large-scale arch structure can be gradually broken down by using a multi-area rotating vibration method.

[0037] Similarly, the vibration strategy can be triggered by the material level height. When it is determined that the material level rise rate or fall rate in the pre-grinding chamber is abnormal, the current height of the material level is determined, and the vibrator corresponding to the current height area is controlled to continuously vibrate according to the preset frequency and amplitude for a duration of 20~30 seconds.

[0038] Generally, when supplying ore to the pre-grinding silo, the normal material level rise rate is 5-6 m / h; when discharging from the pre-grinding silo, the normal material level fall rate is 4-4.5 m / h. Therefore, if the material level rise rate in the pre-grinding silo is greater than (or less than) the normal material level rise rate, or the material level fall rate in the pre-grinding silo is greater than (or less than) the normal material level fall rate, it indicates that the material level rise or fall rate is abnormal.

[0039] For example, if the material level is descending at a rate less than 3 m / h, which is far below the normal rate, it indicates an abnormal descent rate. In this case, the current height of the material level can be obtained, the area to which the current height belongs can be determined, and the ultrasonic sub-array in that area can be controlled to continuously vibrate according to a preset frequency and amplitude. Generally, vibration is performed at a high frequency and low amplitude, with a frequency of 60~80kHz and an amplitude of 5~30μm.

[0040] For example, assuming the area to which the material level belongs is the central region, then the ultrasonic sub-array corresponding to the central region will be activated for vibration.

[0041] In another implementation, when it is determined that the material level in the pre-grinding chamber exceeds the height threshold and the duration exceeds the preset duration threshold, the vibrator in the corresponding area is controlled to vibrate in an intermittent vibration mode.

[0042] For example, if the material level is determined to be greater than 90% of the pre-grinding silo capacity and this condition persists for more than 10 minutes, then the vibrator in the upper area is controlled to perform intermittent vibration. The intermittent vibration can be performed for 5 seconds every 2 minutes.

[0043] In practical applications, abnormal changes in material level and abnormal pressure on the silo wall may occur simultaneously. In one implementation, the controller is also used to: When it is determined that the pressure on the silo wall is greater than the preset pressure threshold and the rate of change of the material level is abnormal, the vibrator in the corresponding area is controlled to vibrate at full power (amplitude and frequency are adjusted to the maximum value), and the electromagnetic vibrators at the bottom chute of the pre-mill silo and the discharge chute are controlled to start vibrating.

[0044] For example, if the material level drop rate is less than 3 m / h and the corresponding area pressure is greater than 0.6 MPa, then the area is determined to be severely blocked. In this case, the vibrator in the area is controlled to vibrate at full power, and the electromagnetic vibrators at the bottom chute of the mill pre-chamber and the discharge chute are controlled to start vibrating, forming a coordinated operation to improve the material unblocking efficiency.

[0045] Based on the same inventive concept as the foregoing embodiments, the present invention also provides a feeding method for wet, sticky ore, wherein the method is applied in the aforementioned system (specifically, in a controller), such as... Figure 2 As shown, the method includes the following steps: S210, obtain the wall pressure and material level height change rate of the pre-grinding chamber; S211, when it is determined that the pressure of the silo wall is greater than the preset pressure threshold and / or the rate of change of the material level is abnormal, the vibrator is controlled to vibrate the corresponding area of ​​the pre-grinding silo.

[0046] The subject of the above method is the controller included in the system. Therefore, the specific implementation of the controller can be referred to the relevant description of the controller in the above system embodiment, and will not be repeated here.

[0047] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages: This invention provides a feeding system and method for wet, sticky ore, comprising: a pre-grinding bin for storing ore and conveying the ore to a belt scale via a bottom chute; the inner wall of the bottom chute is lined with a liner having a friction coefficient of 0.05~0.15; the belt scale for continuously weighing the ore conveyed by the pre-grinding bin and conveying the weighed ore to a discharge chute; the inner wall of the discharge chute is lined with the liner; a slurry mill for grinding the ore; wherein, the pre-grinding bin is equipped with a pressure sensor and a level gauge; during the feeding process, the controller is used to: acquire the bin wall pressure and level of the pre-grinding bin. The height change rate; when it is determined that the pressure of the bin wall is greater than a preset pressure threshold and / or the material level height change rate is abnormal, the vibrator is controlled to vibrate the corresponding area of ​​the pre-grinding bin; thus, the inner wall of the bottom chute and the inner wall of the discharge chute are provided with a liner with a low surface friction coefficient, which improves the smoothness of the ore conveying process; and during the feeding process, if the controller determines that the bin wall pressure and / or the material level height change rate is abnormal, it automatically controls the vibrator to vibrate the corresponding area of ​​the pre-grinding bin, which can not only quickly clear the blockage, improve the stability of the discharge and the grinding efficiency, but also reduce the number of ineffective vibrations, thereby reducing equipment wear and energy consumption.

[0048] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A feeding system for wet, sticky ore, characterized in that, The system includes: a pre-grinding chamber, a belt scale, a discharge chute, a slurry mill, and a controller; The pre-grinding chamber is used to store ore and transport the ore to the belt scale via a bottom chute. The inner wall of the bottom chute is lined with a liner with a friction coefficient of 0.05 to 0.

15. The belt scale is used to continuously weigh the ore conveyed in the pre-grinding chamber and then convey the weighed ore to the discharge chute. The inner wall of the feeding chute is provided with the liner plate; The slurry mill is used to grind the ore; wherein... The pre-grinding chamber is equipped with a pressure sensor and a level gauge; during the feeding process, the controller is used for: The pressure on the wall of the pre-grinding chamber and the rate of change of the material level height are obtained; When it is determined that the pressure on the silo wall is greater than a preset pressure threshold and / or the rate of change of the material level is abnormal, the vibrator is controlled to vibrate the corresponding area of ​​the pre-grinding silo.

2. The system as described in claim 1, characterized in that, The liner is made of ultra-high molecular weight polyethylene.

3. The system as described in claim 1, characterized in that, The system also includes multiple pressure sensors, each of which is installed in a corresponding area on the outer wall of the pre-grind chamber.

4. The system as described in claim 1, characterized in that, The system also includes an electromagnetic vibrator, which is installed at the bottom chute of the pre-grinding chamber and at the discharge chute.

5. The system as described in claim 1, characterized in that, The controller is specifically used for When it is determined that the pressure in a single area of ​​the bin wall is greater than a preset first pressure threshold, the vibrator in the corresponding area is controlled to start a strong vibration mode, and the vibrator in the corresponding area is controlled to be activated for a first preset duration.

6. The system as described in claim 1, characterized in that, The controller is specifically used for: When it is determined that the pressure in multiple areas of the silo wall is greater than the preset second pressure threshold, the vibrators in the corresponding areas are controlled to perform cyclic vibration in order of increasing pressure. During each cycle of vibration, the vibrators in the corresponding areas are controlled to vibrate in order of increasing amplitude.

7. The system as described in claim 1, characterized in that, The controller is specifically used for: When it is determined that the material level rise rate or fall rate in the pre-grinding chamber is abnormal, the current height of the material level is determined, and the vibrator corresponding to the area where the current height is located is controlled to continuously vibrate according to a preset frequency and amplitude.

8. The system as described in claim 1, characterized in that, The control is specifically used for: When it is determined that the material level in the pre-grinding chamber exceeds the height threshold and the duration exceeds the preset duration threshold, the vibrator in the corresponding area is controlled to vibrate in an intermittent vibration mode.

9. The system as claimed in claim 1, characterized in that, The controller is specifically used for: When it is determined that the pressure on the silo wall is greater than the preset pressure threshold and the rate of change of the material level is abnormal, the vibrator in the corresponding area is controlled to vibrate at full power, and the electromagnetic vibrators at the bottom chute of the pre-grinding silo and the discharge chute are controlled to start vibrating.

10. A method for feeding wet, sticky ore, characterized in that, The method is applied to the system according to any one of claims 1 to 9, and the method includes: The pressure on the wall of the pre-grinding chamber and the rate of change of the material level height are obtained; When it is determined that the pressure on the silo wall is greater than a preset pressure threshold and / or the rate of change of the material level is abnormal, the vibrator is controlled to vibrate the corresponding area of ​​the pre-grinding silo.

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