Fine crushing front ore vibration screening device with microwave irradiation

Abstract

The invention relates to a fine crushing front ore vibration screening device with microwave irradiation, which comprises a screening box body, and is characterized by further comprising a feeding hole formed in the top end of the right side of the screening box body, a double-layer screen mechanism arranged in the screening box body, a microwave heating irradiation device and three discharging chutes, the discharging openings are formed in the side wall of the lower portion of the screening box body, the vibrating mechanism is arranged on a front side wall plate of the screening box body, and the buffering mechanisms are arranged at the bottom of the screening box body. The device has the advantages that as the microwave irradiation device is arranged in the device, cracks appear on the surface of minerals by utilizing a microwave irradiation thermal stress principle, the ore grinding efficiency is effectively improved, the ore grinding energy consumption is reduced, and a good grinding aiding effect is achieved; the device is provided with the double-layer screening net, the granularity of ore materials can be selectively screened after intermediate crushing, fine crushing and other links, and mineral grading is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration screening devices, and in particular relates to a fine crushing pre-orbital vibration screening device ring with microwave irradiation. Background Art

[0002] At present, in the mineral processing technology, the conventional grinding method for the separation of high-hardness minerals is to crush the raw ore and screen it, and then finely grind the coarse-grained minerals after screening. The grinding is the most energy-consuming part in the mineral processing process, accounting for 50%-70% of the total energy consumption, while the energy utilization rate of crushing is only about 1%, and most of the energy is lost in the form of heat energy. In order to solve the above problems, people use kilns for the first roasting of raw ore after crushing and screening; cold roasted sand is ground into fine powder.

[0003] Chinese Patent 202110012162.7 discloses a method for improving the grinding efficiency of coated minerals by intermittent microwave pretreatment, the method comprising: S1. crushing the coated mineral into a plurality of granular ores, screening and grading the granular ores through a vibrating screen to obtain an initial ore, and based on the initial ore, naturally drying it in air for 12 hours to obtain a first target ore; S2. loading the first target ore into a ceramic crucible, and performing intermittent microwave heating pretreatment through a microwave oven to obtain a second target ore, and after the pretreatment, naturally cooling the second target ore to room temperature in air; S3. Based on the second target ore, performing grinding treatment through a planetary ball mill to obtain a third target ore, and causing cracks to appear on the surface of the ore through intermittent and periodic microwave irradiation, thereby reducing the difficulty of ore crushing and decomposition and improving grinding efficiency.

[0004] Although the above-mentioned prior art uses a microwave oven to irradiate the minerals with microwaves, the function of the device is single, that is, one device can only achieve screening or microwave irradiation, which cannot meet the user's needs of both ore screening and microwave irradiation at the same time. Summary of the invention

[0005] The purpose of the present invention is to provide a method to solve the problem of single technology and overcome the existing defects, and to provide a fine crushing pre-ore screening device with microwave irradiation in combination with the actual situation on site to improve the efficiency of mineral crushing and grinding.

[0006] The object of the present invention is achieved in this way.

[0007] A fine crushing pre-positioned ore vibration screening device with microwave irradiation of the present invention comprises a screening box, characterized in that: the screening box is a rectangular screening box, and also comprises a feeding port arranged at the top right side of the screening box, a double-layer screen mechanism arranged in the screening box, a microwave heating irradiation device and three discharge chutes, multiple discharge ports arranged on the lower side wall of the rectangular screening box, a vibration mechanism arranged on the upper part of the front side wall plate of the rectangular screening box and multiple buffer mechanisms arranged at the bottom of the rectangular screening box, the double-layer screen mechanism consists of an upper screen obliquely arranged at the lower part of the feeding port in the rectangular screening box and a lower screen located below the upper screen; the three discharge chutes consist of a first discharge chute for receiving materials on the upper screen, a second discharge chute for receiving materials on the lower screen. The screen box 1 is composed of a discharge chute and a third discharge chute for receiving materials under the lower screen. The microwave heating irradiation device is arranged on the upper parts of the first and second discharge chutes in the rectangular screening box 1. A first screening outlet corresponding to the discharge end position of the first discharge chute and a second screening outlet corresponding to the discharge end position of the second discharge chute are provided at the bottom end of the left side of the screening box. A third screening outlet corresponding to the discharge end position of the third discharge chute is provided at the bottom end of the front side of the lower part of the screening box. A coarse material chute connected to the coarse material receiving box on the screen is provided at the bottom corresponding to the first screening outlet and the second screening outlet. A fine material chute connected to the fine material receiving box under the screen is provided at the bottom corresponding to the third screening outlet. The buffer mechanism is a shock-absorbing spring column, which is fixedly connected to the four corners of the bottom of the rectangular screening box 1 respectively.

[0008] Preferably, the microwave irradiation power of the microwave heating irradiation device is 3-12 kW, the microwave irradiation frequency is 2450 Hz, the period of each microwave pulse is less than 1 s, and the pulse period is less than 0.1 s, wherein the pulse time period is less than 0.001 s.

[0009] Preferably, the aperture of the upper screen is the same as that of the lower screen, or the aperture of the upper screen is larger than that of the lower screen.

[0010] Preferably, a mesh screen fixing plate is obliquely fixedly connected to the inner sides of the front and rear side walls of the screening box, and a double-layered plurality of mesh screen fixing slots are equidistantly provided on the mesh screen fixing plate.

[0011] Preferably, the upper screen and the lower screen are respectively the upper screen and the lower screen of a single-layer screen surface or the upper screen and the lower screen of a double-layer screen surface with the same mesh size and staggered arrangement.

[0012] The technical effects and advantages of the present invention are: The minerals of the present invention fall through the feed port to the upper and lower screens below, and are vibrated by a vibrating device to achieve repeated lifting and screening of the minerals. At the same time, a microwave heating and irradiation device arranged on the upper part of the screening box performs microwave irradiation during vibration screening, thereby achieving continuous treatment of radiating and vibrating and grading, thus saving the step of irradiating with a microwave oven alone.

[0013] The present invention provides a microwave irradiation device in the device, which utilizes the principle of microwave irradiation thermal stress to cause cracks on the surface of the mineral, thereby effectively improving the grinding efficiency, saving grinding energy consumption, and achieving a good grinding aid effect; the device is provided with a double-layer screening net, which can selectively screen the particle size of the ore material after the medium crushing, fine crushing and other links, and realize the classification of the minerals. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an overall three-dimensional diagram of a finely crushed ore screening device with microwave irradiation according to the present invention.

[0015] Figure 2 It is a three-dimensional cross-sectional diagram of a finely crushed ore screening device with microwave irradiation according to the present invention.

[0016] Figure 3 It is a structural schematic diagram of the mesh screen fixing plate of the present invention.

[0017] Figure 4 The present invention is a superimposed cross-sectional view of the screen surface of the upper screen in a double-layer screen of a finely crushed ore screening device with microwave irradiation.

[0018] Figure 5 The present invention is a superimposed cross-sectional view of the screen surface of the lower screen in a double-layer screen of a fine ore screening device with microwave irradiation.

[0019] A schematic structural diagram of the double-layer mesh screens of the present invention being staggered and tiltedly arranged in a screening box. DETAILED DESCRIPTION

[0020] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present disclosure will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0021] like Figure 1-Figure 3As shown, a fine crushing pre-position ore vibration screening device with microwave irradiation of the present invention comprises a screening box, characterized in that: the screening box is a rectangular screening box 1, and also comprises a feeding port 2 arranged at the top right side of the screening box, a double-layer screen mechanism arranged in the screening box, a microwave heating irradiation device 3 and three discharge chutes, multiple discharge ports arranged on the lower side wall of the rectangular screening box 1, a vibration mechanism 8 arranged on the upper part of the front side wall plate of the rectangular screening box and multiple buffer mechanisms 11 arranged at the bottom of the rectangular screening box 1, the double-layer screen mechanism consists of an upper screen 12 obliquely arranged at the lower part of the feeding port 2 in the rectangular screening box 1 and a lower screen 13 located below the upper screen 12; the three discharge chutes consist of a first discharge chute (not shown in the figure) for receiving materials on the upper screen 12, a second discharge chute (not shown in the figure) for receiving materials on the lower screen The second discharging chute 15 and the third discharging chute 14 for receiving the material screened under the lower screen 13 are composed. The microwave heating irradiation device 3 is arranged on the upper part of the first discharging chute and the second discharging chute 15 in the rectangular screening box 1. A first screening outlet 5 corresponding to the discharging end position of the first discharging chute and a second screening outlet 7 corresponding to the discharging end position of the second discharging chute 15 are provided at the bottom end of the left side of the screening box. A third screening outlet 9 corresponding to the discharging end position of the third discharging chute 14 is provided at the bottom end of the front side of the lower part of the screening box 1. A coarse material chute 6 connected to the coarse material receiving box on the screen is provided at the bottom corresponding to the first screening outlet 7 and the second screening outlet 5. A fine material chute 10 connected to the fine material receiving box under the screen is provided at the bottom corresponding to the third screening outlet 9. The buffer mechanism 11 is a shock-absorbing spring column, which is fixedly connected to the four corners of the bottom of the rectangular screening box 1 respectively.

[0022] The microwave irradiation power of the microwave heating irradiation device 3 of the present invention is 3-12kw, the microwave irradiation frequency is 2450Hz, the period of each microwave pulse is less than 1s, and the pulse period is less than 0.1s, wherein the pulse time period is less than 0.001s. In the microwave field, the heating rate of gangue minerals is very slow, and the heating rate of useful minerals is very fast. Different minerals have different absorption capacities for microwaves, which results in a significant local temperature difference between useful minerals and gangue minerals, and thermal stress between minerals. When this thermal stress reaches a certain level, cracks will appear on the surface of the mineral, making the ore more grindable, thereby reducing the energy consumption of grinding.

[0023] In the present invention, a mesh fixing plate 16 is obliquely fixedly connected to the inner sides of the front and rear side walls of the screening box 1, and a double-layered plurality of mesh fixing slots 16-1 are equidistantly provided on the mesh fixing plate.

[0024] like Figure 4 and Figure 5As shown, the upper screen and the lower screen described in the present invention are respectively the upper screen 12 and the lower screen 13 of a single-layer screen surface, or they can be the upper screen 12 and the lower screen 13 of a double-layer screen surface with double layers of the same mesh and staggered arrangement.

[0025] When the upper and lower screens use double-layer screens with the same mesh size, the upper and lower screens of the upper screen are fixed together by bolts. The mesh size of the two screens of the upper screen is 40mm×40mm. After the left and right offset movement adjustment, the aperture size can be 20mm×20mm; the aperture size of the lower screen is 20mm×20mm, and the aperture size of the double screen is 10mm×10mm after the left and right offset movement adjustment. The efficiency and particle size of the vibration screening are effectively increased. The double-layer screen set in this way can form two working modes, and a total of four particle size screening of minerals can be achieved. The particle size of ore materials can be selectively screened after medium crushing and fine crushing to achieve mineral classification.

[0026] It should be noted that the terms "first", "second", "third", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to facilitate the embodiments of the present application described herein. In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. "Front", "rear", "left", "right", etc. are only used to indicate the relative position relationship shown in the figures of the present application. When the absolute position of the described object changes, the relative position relationship may change; for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A fine crushing pre-ore vibrating screening device with microwave irradiation, comprising a screening box, characterized in that: The screening box is a rectangular screening box, and also includes a feeding port arranged at the top right side of the screening box, a double-layer screen mechanism, a microwave heating irradiation device and three discharge chutes arranged in the screening box, multiple discharge ports arranged on the lower side wall of the rectangular screening box, a vibration mechanism arranged on the upper part of the front side wall plate of the rectangular screening box and multiple buffer mechanisms arranged at the bottom of the rectangular screening box, the double-layer screen mechanism consists of an upper screen obliquely arranged at the lower part of the feeding port in the rectangular screening box and a lower screen located below the upper screen; the three discharge chutes consist of a first discharge chute for receiving materials on the upper screen, a second discharge chute for receiving materials on the lower screen and a third buffer mechanism for receiving materials under the lower screen. The screening box body is composed of three discharge chutes, the microwave heating irradiation device is arranged on the upper parts of the first screening chute and the second discharge chute in the rectangular screening box body 1, a first screening outlet corresponding to the discharge end position of the first discharge chute and a second screening outlet corresponding to the discharge end position of the second discharge chute are provided at the bottom end of the left side of the screening box body, a third screening outlet corresponding to the discharge end position of the third discharge chute is provided at the bottom end of the front side of the lower part of the screening box body, a coarse material chute connected to the coarse material receiving box on the screen is provided at the bottom corresponding to the first screening outlet and the second screening outlet, a fine material chute connected to the fine material receiving box under the screen is provided at the bottom corresponding to the third screening outlet, and the buffer mechanism is a shock-absorbing spring column, which is respectively fixedly connected to the four corners of the bottom of the rectangular screening box body.

2. The fine crushing pre-ore vibrating screening device with microwave irradiation according to claim 1 is characterized in that: The microwave irradiation power of the microwave heating irradiation device is 3-12kw, the microwave irradiation frequency is 2450Hz, the period of each microwave pulse is less than 1s, and the pulse period is less than 0.1s, wherein the pulse time period is less than 0.001s.

3. The fine crushing pre-ore vibrating screening device with microwave irradiation according to claim 1 is characterized in that: The aperture of the upper screen is the same as that of the lower screen, or the aperture of the upper screen is larger than that of the lower screen.

4. The fine crushing pre-ore vibrating screening device with microwave irradiation according to claim 1 is characterized in that: A mesh screen fixing plate is obliquely fixedly connected to the inner sides of the front and rear side walls of the screening box, and a double-layered plurality of mesh screen fixing slots are equidistantly provided on the mesh screen fixing plate.

5. The fine crushing pre-ore vibrating screening device with microwave irradiation according to claim 1 is characterized in that: The upper screen and the lower screen are respectively the upper screen and the lower screen of a single-layer screen surface or the upper screen and the lower screen of a double-layer screen surface with the same mesh size and staggered arrangement.

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