AU2016249176B2

AU2016249176B2 - Intelligent ore dry separation system based on intelligent air nozzle arranged in array

Info

Publication number: AU2016249176B2
Application number: AU2016249176A
Authority: AU
Inventors: Taiyou LI; Yunfeng Li
Original assignee: Tianjin Meiteng Technology Co Ltd
Current assignee: Tianjin Meiteng Technology Co Ltd
Priority date: 2015-04-16
Filing date: 2016-01-22
Publication date: 2018-10-18
Anticipated expiration: 2036-01-22
Also published as: CN105268634A; AU2016249176A1; WO2016165442A1

Abstract

An intelligent ore dry separation system based on intelligent air nozzles arranged in an array is mainly comprised of a distribution device, an identification device, and an execution mechanism. The identification device includes an emission ray source (3) located above the distribution device and an emission ray detector (4) located below the distribution device. The execution mechanism includes air nozzles (11) having outlets facing towards trajectories of ore concentrates and tailings. The emission ray detector (4) of the identification device identifies the ore concentrates and the tailings via physical properties thereof and outputs position information thereof on the distribution device to the execution mechanism. The air nozzles (11) of the execution mechanism are arranged in an array, and an air nozzle (11) at a corresponding position according to the position of a target object. The intelligent ore dry separation system of the present invention has improved separation precision and a lower separation lower limit, and reduces energy consumption.

Description

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INTELLIGENT ORE DRY SEPARATION SYSTEM BASED ON INTELLIGENT AIR NOZZLE ARRANGED IN ARRAY

FIELD OF THE INVENTION [0001] The present disclosure relates to the field of dry mineral (coal) separation, and more particularly to a dry mineral separation system based on intelligent air nozzles arranged in an array.

BACKGROUND OF THE INVENTION [0002] Dry mineral separation based on ray identification has advantages such as no water use, simple process, low investment, and low production cost. Since the year of 2005, this technique has been increasingly applied in coal industry, for example, such as in Shenhuo Group’s Liangbei coal mine and Muchengjian coal mine in Peking. As an example of existing automatic mineral separators based on ray identification, an automatic coal gangue separator is disclosed in Chinese Patent No. CN101637765 B, which includes a raw material feeding copper, a coal receiving hopper, a gangue receiving hopper, a belt conveyor positioned between the raw material feeding hopper and the coal and gangue receiving hoppers, an identification and separation control mechanism, and an execution mechanism. The identification and separation control mechanism includes a gamma-ray source positioned below the conveyor belt, a ray sensor positioned above the conveyor belt at a location corresponding to the gamma-ray source, a measurement instrument electrically connected to the ray sensor, and an ultrasonic transceiver positioned above the conveyor belt and electrically connected to the measurement instrument. The execution mechanism is a high frequency air valve positioned above the coal and gangue receiving hoppers, with the valve port thereof oriented toward the drop trajectory of coal and gangue.

[0003] Existing automatic mineral separators involve line up by channel, detection by channel, and independent execution by channel. As such, an air nozzle of each channel may strike inaccurately the material that does not pass through its center, thereby compromising the separation effects. Furthermore, the same type of air nozzle in the channel is used regardless of the size of the material bricks. Therefore, when small tailings are being blew, small concentrates in the vicinity may be brought out due to the excessive air volume. Meanwhile, when small bricks are being blew, severe air waste would occur, resulting in a long time operation of a low energy efficiency.

[0004] Production practice shows that automatic mineral separators based on ray identification such as existing automatic coal gangue separators have a poor separation precision. Both the proportion of tailings entrained in concentrates and the proportioned of concentrates entrained in tailings are between 10-20%, which is far from the required precision for main separation apparatus in mineral separation plants.

SUMMARY OF THE INVENTION [0005] It is one object of the present disclosure to provide an intelligent dry mineral separation system based on intelligent air nozzles arranged in an array. The separation system overcomes the defects of low separation precision, low process capacity, and low energy efficiency due to detection by channel and independent channel execution in existing automatic concentrate and tailing separators.

[0006] To achieve the above objective, in accordance with one embodiment of the invention, the present disclosure adopts the following technical solutions.

[0007] An intelligent dry mineral separation system based on intelligent air nozzles arranged in an array comprises a distribution device, an identification device, and an execution mechanism. The identification device comprises a ray source positioned above the distribution device and a ray detector positioned below the distribution device, or alternatively a spectrum analyzer positioned on the same side as the distribution device. The execution mechanism comprises air nozzles with the outlets thereof being oriented toward the movement trajectory of concentrates and tailings. The ray detector of the identification device is a ray linear array detector that not only identifies the concentrates and tailings based on their physical characteristics but also outputs the information about the position of the concentrates and tailings on the distribution device to the execution mechanism. The air nozzles of the execution mechanism are arranged in an array, and an air nozzle at a position corresponding to that of the concentrates or tailings to be separated is opened.

[0008] Preferably, the distribution device is a horizontally arranged conveyor belt, a conveyor belt arranged in an inclined manner, an angularly inclined sliding plate, or a combination thereof. The distribution device receives raw material from a feeding device, which may be a screener, a feeder, a belt conveyor, a gate, or a vibrating distribution screener.

[0009] Preferably, the ray linear array detector is an X-ray linear array detector or a γ-ray linear array detector.

[0010] Preferably, the ray linear array detector comprises a digital board and an analog board. Each analog board comprises a plurality of detector channels. The detectors are arranged at an equal spacing that is predetermined based on a required identification resolution. The plurality of analog boards is arranged close to one another so as to form a detector linear array that matches the width of the distribution device. A ray passes through the object to be detected and arrives at the detector. Based on the magnitude of the signal received by the detector, equivalent atom information of the materials can be acquired in order to identify and classify the materials.

[0011] Besides identification of concentrates and tailings based on their physical characteristics, the identification device can also output the information about the position of the concentrates and tailings on the distribution device to the subsequent execution mechanism.

[0012] Preferably, the opening and closing of the air nozzles is controlled by a high-frequency solenoid valve; an air tank is connected to the high-frequency solenoid valve through a first air pipe and the high-frequency solenoid valve is connected to the air nozzles through a second air pipe.

[0013] Unlike the arrangement in existing automatic coal gangue separators in which one air nozzle is provided for each channel, the present disclosure provides a modified

J arrangement of an air nozzle array for which the execution mechanism opens intelligently a high-frequency solenoid valve corresponding to the position of the concentrates or tailings to be separated.

[0014] In existing automatic mineral separators, one set of a γ ray source and a ray sensor and a high-frequency air valve are provided for each channel. The centers of the γ ray source, the ray sensor, and the high-frequency air valve are all aligned with the center of the channel. As the width of the channel needs to be adapted to the upper limit of particle size, for example, a channel of a width of 100 mm may be provided for feeding material of an upper limit of 80 mm, the position of materials of a small particle size in the channel cannot be controlled. As such, in the case where a small material brick is positioned other than the center of the channel or even positioned between two channels, execution deviation may occur.

[0015] With the technical solution of the present disclosure, the raw materials are not required to be lined up by channel, as long as the raw materials are arranged one by one on the distribution device without overlapping. As the identification device can output the position of a material brick and the air nozzles in the execution mechanism are arranged densely in an array, the identification device can determine the positions of the concentrates and tailings accurately, regardless of the positions of the concentrate and tailing on the distribution device. Upon calculation of the control system, the execution mechanism can always find one or more air nozzles at a corresponding position and open them intelligently within a predetermined time period.

[0016] The present disclosure changes the arrangement of raw materials from a linear queue with a large spacing to a single layer of a plane array. In this way, the space utilization of the distribution device is also considerably improved and the process capacity of the apparatus is improved, which provides an essential support for further lowering the lower separation limit and thus applying the intelligent dry separation process to material bricks and particles of a size of 3-300 mm.

[0017] In existing automatic mineral separators, one air nozzle is provided for each channel and the flow and thrust of the air nozzle are designed and chosen for the brick gangue of the largest particle size. The present disclosure optimizes a single large air nozzle that is arranged sparsely and used independently as several small air nozzles arranged in an array. The size of these air nozzles are chosen for a single gangue brick of the smallest particle size. If the object to be separated is a small brick, one air nozzle is opened. If the object to be separated is a large brick, multiple air nozzles covered by the large brick are opened. Such a process of using one air nozzle for small bricks and multiple air nozzles for large bricks is advantageous over the existing design of using a single large air nozzle for both large and small bricks in that the present design allows a lower air loss, a higher energy efficiency, and a more precise separation. In the present disclosure, the size, quantity, and arrangement density of the air nozzles are custom designed according to parameters such as the particle size and quality of the feeding material in the intelligent dry separator.

[0018] Besides the three essential devices, i.e. the distribution device, the identification device, and the execution mechanism, the separation system according to the present disclosure also comprises a feeding device, a dust removal device, a concentrate collection chute and a tailing collection chute, and an air supply device. All the mechanical subsystems in the present intelligent separation system are controlled by the control system and operate under its control and with its cooperation.

[0019] The intelligent dry mineral separation system of the present disclosure can achieve the following advantageous effects:

[0020] With the technical solutions described above, the intelligent dry separation system features an increased separation precision and a lowered lower limit of separation, thereby enabling the intelligent dry separation process to be applied to all raw material bricks of a size of 3-300 mm. As the execution mechanism is densely arranged in an array, the air volume consumed during separation is decreased, thereby reducing the energy consumption.

BRIEF DESCRIPTION OF THE DRAWINGS [0021] FIG. 1 shows a schematic diagram of an intelligent dry mineral separation system based on intelligent air nozzles arranged in an array according to the present disclosure; and [0022] FIG. 2 shows a schematic diagram of an intelligent air nozzle array according to the present disclosure.

[0023] 1-feeding device; 2-belt conveyor; 3-ray source; 4-ray linear array detector;

5-intelligent air nozzle array; 6-tailing collection chute; 7-concentrate collection chute; 8-control system; 9-dust removal system; 10-air supply system; 11-outlet of the intelligent air nozzle array; 12-valve mounting plate; 13-high-frequency solenoid valve.

DETAILED DESCRIPTION OF THE EMBODIMENTS [0024] The invention is described hereinbelow with reference to the accompanying drawings.

[0025] FIG. 1 shows an intelligent dry mineral separation system based on intelligent air nozzles arranged in an array.

[0026] The intelligent dry mineral separation system based on intelligent air nozzles arranged in an array is a dry separation apparatus for intelligent identification and separation of minerals using rays. The intelligent dry mineral separation system based on intelligent air nozzles arranged in an array identifies concentrates and tailings according to the difference between their ray absorption amounts and uses air nozzles as an execution mechanism which is applicable to separation of mineral bricks and particles of a size of 3-300 mm.

[0027] The raw material is fed by a feeding device 1 to a belt conveyor 2 and is distributed on a belt conveyor 2 to achieve a single layer arrangement of material bricks in which each material brick is separated from adjacent material bricks at its front, behind, left, and right by a certain spacing, so as to be prepared for detection. A ray source 3 and a ray linear array detector 4 determine whether the raw material brick is a concentrate or a tailing and output the position information of the material brick to a control system 8.

The control system 8 opens one or more air nozzles in an intelligent air nozzle array 5 at a position corresponding to the position of the concentrates or tailings to be separated. The tailings being blew are collected by a tailing collection chute 6, whereas the concentrates remain their original movement trajectory and are collected by a concentrate collection chute 7. In this way, the dry mineral separation process is completed. Adust removal system 9 removes the dust resulting from air blowing to maintain a clean environment. An air supply system 10 supplies air to the intelligent air nozzle array 5.

[0028] In the actual schematic structural view of the intelligent air nozzle array 5 shown in FIG. 2, a high frequency solenoid valve 13 is mounted on a valve mounting plate 12 and is connected to the intelligent air nozzle array 5 through air holes in the valve mounting plate 12 or through a separate pipe. The outlets 11 of the intelligent air nozzle array are arranged in an array.

[0029] While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.

Claims

INTELLIGENT ORE DRY SEPARATION SYSTEM BASED ON INTELLIGENT

AIR NOZZLE ARRANGED IN ARRAY

1. An intelligent dry mineral separation system based on intelligent air nozzles arranged in an array, the system comprising a distribution device, an identification device, a dust removal system, and an execution mechanism; wherein the identification device comprises a ray source positioned above the distribution device and a ray detector positioned below the distribution device, or alternatively a spectrum analyzer positioned on the same side as the distribution device;

the execution mechanism comprises air nozzles with outlets thereof being oriented toward a movement trajectory of concentrates and tailings;

the ray detector of the identification device is a ray linear array detector adapted to identify the concentrates and tailings based on their physical characteristics and to output position information of the concentrates and tailings on the distribution device to the execution mechanism;

the air nozzles of the execution mechanism are arranged in an array;

the execution mechanism is adapted to open an air nozzle at a position corresponding to that of the concentrates or tailings to be separated; and the dust removal system is disposed in the vicinity of the identification device.
2. The intelligent dry mineral separation system of claim 1, characterized in that the distribution device is a horizontally arranged conveyor belt,

2016249176 12 Sep 2018 a conveyor belt arranged in an inclined manner, an angularly inclined sliding plate, or a combination thereof.
3. The intelligent dry mineral separation system of claim 1, characterized in that the ray linear array detector is an X-ray linear array detector or a γ-ray linear array detector.
4. The intelligent dry mineral separation system of claim 3, characterized in that the ray linear array detector comprises a digital board and an analog board, and each analog board comprises a plurality of detector channels.
5. The intelligent dry mineral separation system of claim 1, characterized in that the opening and closing of the air nozzles is controlled by a high-frequency solenoid valve; an air tank is connected to the highfrequency solenoid valve through a first air pipe and the high-frequency solenoid valve is connected to the air nozzles through a second air pipe.
6. The intelligent dry mineral separation system of claim 1, characterized in that the dust removal system is adapted to remove dust in the vicinity of the identification device.