CN115032213A - Neutron photon fusion ore sorting method and system - Google Patents
Neutron photon fusion ore sorting method and system Download PDFInfo
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Abstract
The application provides a neutron photon fusion ore sorting method and system, comprising the following steps: generating target photon rays and target neutron rays through a ray conversion target; irradiating the ore with the target photon rays and the target neutron rays to obtain transmission target photon rays and transmission target neutron rays transmitted through the ore; determining the grade of the ore according to the transmission target photon rays and the transmission target neutron rays transmitted through the ore and the target photon rays and the target neutron rays received by a detector; and when the grade of the ore meets a set condition, determining the ore as a target ore for sorting. The method aims to carry out grade separation on the lithium ores with high efficiency and low cost.
Description
Technical Field
The invention relates to the technical field of ore sorting, in particular to a neutron photon fusion ore sorting method and system.
Background
In recent years, a great demand is put on lithium in the field of new energy resources (such as electric vehicles, energy storage and the like), but the lithium ore resources have low grade, poor occurrence environment and incomplete breakthrough of the high-magnesium brine lithium extraction technology, so that the resources are difficult to exploit, the yield is low, the cost is high, and the dependence on import is difficult to get rid of in a short time.
The traditional ore lithium extraction technology at present has three types: (1) a flotation method; (2) heavy medium beneficiation; (3) a dense medium-flotation combined process. The method (1) is the most important method, about 1 ton of lithium concentrate with the grade of about 5% can be selected from 3 tons of raw ores with the grade of about 1.5%, the recovery rate of lithium oxide reaches about 80%, but the process is complex, the dosage of the medicament is large, and the beneficiation cost is 120-140 yuan/ton. (2) The method is suitable for ores with high spodumene crystallization strength, simple in process, low in overall investment and low in beneficiation cost, the comprehensive recovery rate of lithium oxide is 60-80% according to the properties of the ores, and the beneficiation cost is 30-40 yuan/ton. (3) The method has the functions of coarse grain tailing discarding, pre-enrichment and comprehensive resource utilization, and the comprehensive recovery rate can reach about 80%.
With the development of industry and the improvement of the requirement on environmental protection, the traditional ore lithium extraction technology has the problems of high capital investment, heavy environmental pollution, high water consumption, high operation cost, high energy consumption, unstable product quality and the like. Therefore, the problem of sorting the lithium ore with high efficiency, low pollution and low energy consumption is needed, so that the extraction cost of the lithium ore is reduced.
Disclosure of Invention
In view of the above, the present application provides a neutron photon fusion ore sorting method and system. The method aims to carry out grade separation on the lithium ores with high efficiency and low cost.
In a first aspect, the present application provides a neutron-photon fusion ore sorting method, comprising:
generating target photon rays and target neutron rays through a ray conversion target;
irradiating the ore through the target photon rays and the target neutron rays to obtain transmission target photon rays and transmission target neutron rays which are transmitted through the ore;
determining a grade of the ore from the transmission target photon rays and the transmission target neutron rays transmitted through the ore, and the target photon rays and the target neutron rays received by a detector;
and when the grade of the ore meets a set condition, determining the ore as a target ore for sorting.
Optionally, the generating target photon rays and target neutron rays by ray conversion of the target comprises:
bombarding electrons generated by an electron accelerator to a target to generate neutron rays and target photon rays;
and carrying out moderation treatment on the neutron rays to obtain target neutron rays.
Optionally, the slowing down the neutron ray to obtain a target neutron ray includes:
performing first collision moderation treatment on the neutron rays to obtain first neutron rays;
and carrying out secondary collision moderation treatment on the first neutron rays to obtain target neutron rays.
Optionally, said irradiating the ore with said target photon rays and said target neutron rays to obtain transmitted target photon rays and transmitted target neutron rays transmitted through the ore comprises:
target photon rays and target neutron rays are incident from one side of a conveyor belt to irradiate ore transported on the conveyor belt;
transmitted target photon rays and transmitted target neutron rays transmitted through the ore exit the other side of the conveyor belt.
Optionally, said determining the grade of the ore from the transmitted target photon rays and the transmitted target neutron rays transmitted through the ore and the target photon rays and the target neutron rays received by the detector comprises:
receiving transmission target photon rays and transmission target neutron rays through a detector, and measuring respective counting rates of the transmission target photon rays and the transmission target neutron rays;
receiving the target photon rays and the target neutron rays through a detector, and measuring the respective counting rates of the target photon rays and the target neutron rays;
determining an attribute factor of the ore according to the respective count rates of the transmission target photon rays and the transmission target neutron rays and the respective count rates of the target photon rays and the target neutron rays;
and determining the ore grade according to the attribute factor and the corresponding relation between the preset attribute factor and the ore grade.
Optionally, the detector comprises a neutron detector and a photon detector;
the neutron detector is close to one side of the ore, and the photon detector is far away from one side of the ore.
Optionally, the target photon rays and the target neutron rays generated by the radiation conversion target are cone-angle directed at the ore.
Optionally, the acceleration energy of the electron accelerator is greater than or equal to 1.67 MeV;
the particle size range of the ore is 100 mu m to 5 cm;
the grade measurement accuracy of the ore is 0.1%.
The embodiment of the application provides a neutron photon fusion ore sorting method. By directing both the target photon rays and the target neutron rays towards the lithium ore, the target photon rays and the target neutron rays will be transmitted through the lithium ore, the target photon rays and the target neutron rays transmitted through the lithium ore being transmitted target photon rays and transmitted target neutron rays. According to the detected target photon rays and target neutron rays, and the detected transmission target photon rays and transmission target neutron rays, the content of lithium in the lithium ore can be determined, so that the high-efficiency and low-cost grade separation of the lithium ore can be realized.
And carrying out first-time slowing treatment on the target neutron rays to increase the speed of neutrons and photons, so that the transmission target photon rays and the transmission target neutron rays can be detected by a detector respectively. Meanwhile, the target neutron rays after the first moderation treatment are subjected to the second moderation treatment again, so that the accuracy of the lithium ore grade sorting is improved.
In a second aspect, the present application provides a neutron photon fused ore sorting system, the system comprising:
an electron accelerator for accelerating electrons;
the ray conversion target is used for receiving bombardment of the accelerated electrons to generate target photon rays and target neutron rays;
a detector for receiving transmitted target photon rays and transmitted target neutron rays transmitted through the ore after the target photon rays and the target neutron rays irradiate the ore, and receiving the target photon rays and the target neutron rays, and measuring respective count rates of the transmitted target photon rays and the transmitted target neutron rays;
the ore grade determining module is used for determining an attribute factor of the ore according to the respective counting rates of the transmission target photon ray and the transmission target neutron ray and the respective counting rates of the target photon ray and the target neutron ray, and determining the ore grade according to the attribute factor, a preset corresponding relation between the attribute factor and the ore grade;
and the ore sorting module is used for determining the ore as the target ore to be sorted when the grade of the ore meets the set condition.
Optionally, the radiation conversion target comprises:
the ray generation module is used for bombarding the electrons generated by the electron accelerator to the ray conversion target to generate neutron rays and target photon rays;
and the moderating processing module is used for performing moderating processing on the neutron rays to obtain target neutron rays.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flow chart of a neutron photon fusion ore sorting method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a neutron-photon fusion ore sorting method according to an embodiment of the present application;
FIG. 3 is a time diagram of a detector in a neutron photon fusion ore sorting method according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating neutron and photon attenuation in a neutron photon fusion ore sorting method according to an embodiment of the present application;
fig. 5 is a schematic diagram illustrating a correspondence relationship between attribute factors and ore grades in a neutron-photon fusion ore sorting method according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a detector in a neutron photon fusion ore sorting method according to an embodiment of the present application;
fig. 7 is a schematic diagram of a neutron photon fusion ore sorting system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flow chart of a neutron photon fusion ore sorting method according to an embodiment of the present application. Referring to fig. 1, the present application provides a neutron photon fusion ore sorting method, comprising the steps of;
step S11: generating target photon rays and target neutron rays through a ray conversion target;
step S12: irradiating the ore through the target photon rays and the target neutron rays to obtain transmission target photon rays and transmission target neutron rays which are transmitted through the ore;
step S13: determining the grade of the ore according to the transmission target photon rays and the transmission target neutron rays transmitted through the ore and the target photon rays and the target neutron rays received by a detector;
step S14: and when the grade of the ore meets a set condition, determining the ore as a target ore for sorting.
In the present embodiment, fig. 2 is a schematic diagram illustrating a neutron photon fusion ore sorting method according to an embodiment of the present application. Referring to fig. 2, electrons accelerated by an electron accelerator strike a radiation conversion target to produce target neutron rays and target photon rays.
The ore is conveyed on a conveyor belt, target neutron rays and target photon rays are generated and emitted to the ore conveyed on the conveyor belt from one side of the conveyor belt, the target neutron rays and the target photon rays penetrating through the ore are received by a detector, and the target neutron rays and the target photon rays penetrating through the ore are transmitted target photon rays and transmitted target neutron rays.
Meanwhile, the detector receives the target neutron rays and the target photon rays when the generated target neutron rays and the generated target photon rays are not blocked by the ore on the conveyor belt. It should be understood that the generation of target neutron rays and target photon rays that are not blocked by the ore on the conveyor includes the ore on the conveyor not being conveyed by the conveyor to the emission path of the target neutron rays and target photon rays before the conveyor is activated, or the ore on the conveyor having a time gap between two ore pieces during conveyance that does not block the target neutron rays and target photon rays.
And determining the grade of the ore through calculation according to the transmission target photon rays and the transmission target neutron rays which are transmitted through the ore and are received by a detector, and the target photon rays and the target neutron rays.
When the grade of the ore meets a preset condition, the ore is determined as a target ore, and the target ore is selected from a conveyor belt for subsequent ore extraction.
In this application, the generating of target photon rays and target neutron rays by a ray conversion target includes: bombarding electrons generated by an electron accelerator to a target to generate neutron rays and target photon rays; and carrying out moderation treatment on the neutron rays to obtain target neutron rays.
In this embodiment, the speed of photons in photon rays is constant, although the speed of neutrons is obviously different from that of photons, the speeds of the photons are fast, and the distance between the ray conversion target emitting photon rays and neutron rays and the detector receiving transmitted photon rays and transmitted neutron rays cannot be set too far. Therefore, in a case where the distance provided between the radiation conversion target and the detector cannot be secured far enough, the detector cannot easily receive the transmitted photon radiation and the transmitted neutron radiation separately. Meanwhile, the electron pulse accelerated by the electron accelerator has a time width, so that the first photon and the last photon of the photon ray emitted by the ray conversion target will be different by a period of time, thereby also causing the photon ray received by the detector to be mixed with the neutron ray, and the neutron ray is mixed with the photon ray, so that the transmitted photon ray and the transmitted neutron ray cannot be received separately.
If the ray conversion target simultaneously generates neutron rays and photon rays, the neutron speed is 1cm/ns, the photon speed is 30cm/ns, although the speed difference between the neutron speed and the photon speed is 30 times, under the condition that the ray conversion target and the detector cannot be arranged far enough, the neutron rays immediately reach the detector after the photon rays reach the detector, and the detector cannot conveniently and separately receive the transmission photon rays and the transmission neutron rays. At the same time, the electron pulse accelerated by the electron accelerator has a temporal width, e.g. 5us wide, i.e. the first photon in the photon beam is emitted 5000ns different from the last photon, resulting in a photon pulse of 15000m length. Under the condition that the ray conversion target and the detector cannot be arranged far enough, neutrons can quickly reach the detector after the first photon reaches the detector, and meanwhile, many neutrons reach the detector before the last photon reaches, and at the moment, the detector cannot separately receive the neutron rays and the photon rays.
Therefore, the target is bombarded by electrons generated by the electron accelerator, the neutron rays and the target photon rays are generated, and then collision slowing treatment is carried out on the generated neutron rays to reduce the speed of the neutron rays, so that the target neutron rays are obtained.
In this embodiment, the speed between the neutron ray and the target neutron ray obtained after the collision moderation processing of the neutron ray and the neutron ray is reduced by at least 4 orders of magnitude to separate the transmission target photon ray from the transmission target photon ray, so that the detector can be ensured to receive the transmission target photon ray and the transmission target photon ray respectively, and the grade of the ore can be determined based on that the detector can receive the transmission target photon ray and the transmission target photon ray respectively.
In this application, the slowing down the neutron ray to obtain the target neutron ray includes: performing first collision moderation treatment on the neutron rays to obtain first neutron rays; and carrying out secondary collision moderation treatment on the first neutron rays to obtain target neutron rays.
In this embodiment, the ore includes at least lithium ore. The reaction cross section of lithium element and neutron is larger than that of other elements and neutron, and the counting rate of the detector finally receiving the detected transmission neutron ray is more influenced by the lithium element. In order to improve the calculation accuracy of the grade of the lithium ore, the lithium element is amplified, and the influence of other elements on the counting rate of the transmission neutron ray finally received and detected by the detector is reduced, so that the counting rate of the transmission neutron ray finally received and detected by the detector is only influenced by the lithium element as far as possible, and the grade of the lithium ore can be more accurately determined based on the counting rate of the transmission neutron ray finally received and detected. In the embodiment of the present embodiment, the reaction cross section of the element and the neutron is inversely proportional to the neutron velocity, and the reaction cross section of the neutron ℃ —. 1/v (v is the neutron velocity), so that the reaction cross section of the element and the neutron can be increased by decreasing the neutron velocity (i.e. the energy of the neutron). And because the reaction cross section of lithium element and neutron is bigger than other elements, therefore, by reducing the neutron speed, the reaction cross section of lithium element and neutron becomes bigger than other elements, that is to say, the analysis sensitivity difference of lithium element and other elements is bigger, the counting rate of the transmission neutron ray finally received and detected by the detector is only influenced by the neutron reaction cross section of lithium element to a greater extent, and the grade of lithium ore can be calculated more accurately based on the counting rate of the transmission neutron ray finally received and detected by the detector.
For example, the 25.3meV neutron reaction cross section of oxygen is 1.7X 10 -4 The reaction section of 25.3meV neutron of lithium is about 940 targets, the difference is about 1000 ten thousand times, and after the reaction section is increased by the same times, the difference between the lithium and the section of other elements becomes larger.
Therefore, the neutron ray is subjected to first collision moderation treatment to obtain a first neutron ray, so that the neutron ray and the photon ray are separated, and the detector can receive the transmission neutron ray and the transmission photon ray respectively. After first collision moderation treatment is carried out to obtain first neutron rays, second collision moderation treatment is carried out on the first neutron rays to obtain target neutron rays, the lithium ore is irradiated by the target neutron rays to increase the analysis sensitivity difference between the reaction section of lithium elements and neutrons and the reaction section of other elements and neutrons, the counting rate of the transmitted neutron rays finally received and detected by the detector is only influenced by the neutron reaction section of the lithium elements to a greater extent, and the grade of the lithium ore can be calculated more accurately based on the counting rate of the transmitted neutron rays finally received and detected by the detector.
In this embodiment, fig. 3 is a time structure diagram of a detector in an ore sorting method using neutron photon fusion according to an embodiment of the present application. Referring to FIG. 3, the time of electron bombardment of the radiation conversion target is at time t0, the electron pulse bombarding the radiation conversion target has a time width Δ t, the detector detects the first photon at time t1, and the detector detects the last photon at time t2, where the time duration of time t2 and t1 is just equal to the time width Δ t of the electron pulse (typical value of t2-t1 is 5 μ s). The detector detects the first neutron at time t3 and the last neutron at time t 4. The energy of the neutrons is reduced to energy regions below eV for better sensitivity to lithium ore, so the flight speed of the neutrons is slow, at the level of hundreds of mus to 10 ms. The neutron rays after the two times of collision moderation treatment can be separated from the photon rays, so that the detector can detect the transmission neutron rays and the transmission photon rays respectively, and the sensitivity of the neutron rays to the lithium ore is greatly improved.
In this embodiment, after an electron pulse is accelerated by an electron acceleration, it bombards a radiation conversion target, the electron generates a target photon ray in the radiation conversion target by bremsstrahlung, a photon in the target photon ray generates a neutron by a photonuclear reaction, and the generated neutron is subjected to a first collision moderation treatment and a second collision moderation treatment in the radiation conversion target, so as to obtain a target neutron ray.
In this application, said irradiating the ore with said target photon rays and said target neutron rays to obtain transmitted target photon rays and transmitted target neutron rays transmitted through said ore comprises: target photon rays and target neutron rays are incident from one side of a conveyor belt to irradiate ore transported on the conveyor belt; transmitted target photon rays and transmitted target neutron rays transmitted through the ore exit the other side of the conveyor belt.
In this embodiment, referring to fig. 2, lithium ore is transported on a conveyor belt, a target photon ray and a target neutron ray are emitted from a ray conversion target fixed to one side of the conveyor belt, and a target photon ray and a target neutron ray transmitted through the lithium ore are received by a detector fixed to the other side of the conveyor belt. Therefore, the determination of the grade of the lithium ore can be completed directly in the process of lithium ore transmission, and the determination efficiency is high.
In this application, said determining the grade of said ore from said transmitted target photon rays and said transmitted target neutron rays transmitted through said ore, and said target photon rays and said target neutron rays received by a detector comprises: receiving transmission target photon rays and transmission target neutron rays through a detector, and measuring respective counting rates of the transmission target photon rays and the transmission target neutron rays; receiving the target photon rays and the target neutron rays through a detector, and measuring respective count rates of the target photon rays and the target neutron rays; determining an attribute factor of the ore according to the respective count rates of the transmission target photon rays and the transmission target neutron rays and the respective count rates of the target photon rays and the target neutron rays; and determining the ore grade according to the attribute factor and the corresponding relation between the preset attribute factor and the ore grade.
In this embodiment, a detector receives a transmission target photon ray and a transmission target neutron ray, and measures respective count rates of the transmission target photon ray and the transmission target neutron ray, where the count rate of the transmission target photon ray is I x The counting rate of the neutron rays of the transmission target is I n . Receiving the target photon ray and the target neutron ray through a detector, and measuring the respective counting rates of the target photon ray and the target neutron ray, wherein the counting rate of the target photon ray is I n,0 And a target neutron ray count rate of I x,0 。
Fig. 4 is a schematic diagram illustrating neutron and photon attenuation in a neutron photon fusion ore sorting method according to an embodiment of the present application. Referring to FIG. 4, with Li in lithium ore 2 The neutron and photon attenuation characteristics are different depending on the O content, with Li in the lithium ore 2 Of content of OThe increase in photons gives almost no attenuation, while the attenuation of neutrons decreases almost linearly.
The target photon rays and the target neutron rays obey the following exponential decay law:
wherein N is the atomic number density (1/cm) in the ore 3 Unknown), D is the thickness of the ore (unknown), σ n And σ x The reaction cross section (cm) of the ore to neutrons and photons respectively 2 Also unknown).
And determining an attribute factor F of the ore according to the respective counting rates of the transmission target photon rays and the transmission target neutron rays and the respective counting rates of the target photon rays and the target neutron rays.
The attribute factor F is calculated as follows:
and establishing a corresponding relation between the attribute factor F and the lithium ore grade in advance. After the counting rates of the transmission target photon rays and the transmission target neutron rays are obtained through measurement of a detector and the counting rates of the target photon rays and the target neutron rays are obtained through measurement, the value of the attribute factor F of the lithia ore can be determined through the calculation mode of the attribute factor F. And inquiring the lithium ore grade corresponding to the value of the attribute factor F of the determined lithium ore in the corresponding relation between the attribute factor F and the lithium ore grade, thus determining the grade of the lithium ore.
In this embodiment, fig. 5 is a schematic diagram illustrating a corresponding relationship between attribute factors and ore grades in a neutron photon fusion ore sorting method according to an embodiment of the present application. Referring to fig. 5, fig. 5 shows that the corresponding relationship between the attribute factor F and the grade of the lithium ore is pre-established, for example, the value of the attribute factor F to the lithium ore is determined to be 2.2, and by querying the corresponding relationship between the attribute factor F and the grade of the lithium ore pre-established in fig. 5, the grade of the lithium ore is determined to be 2, that is, the content of lithium dioxide in the lithium ore is 2%.
It should be understood that the corresponding relationship between the attribute factor of the lithium ore and the grade of the lithium ore may vary according to the producing area of the lithium ore, the mining depth of the lithium ore, and the like. Therefore, the pre-established correspondence relationship between the attribute factor F and the lithium mineral grade in fig. 5 is only an exemplary illustration and is not intended to limit the present application.
The method for establishing the corresponding relationship between the attribute factor F and the lithium ore grade in advance comprises the steps of calibrating the corresponding relationship between the corresponding lithium ore attribute factor F and the corresponding lithium ore grade based on ores produced in different producing areas of lithium ores, for example, mining a plurality of lithium ores in the producing areas, measuring the attribute factor F of each lithium ore, detecting the lithium content in each lithium ore by other detection equipment, calibrating the corresponding relationship curve between the lithium ore attribute factor F and the lithium ore grade according to the attribute factor F of each lithium ore and the lithium content in each lithium ore, determining the corresponding relationship curve as the corresponding relationship between the lithium ore attribute factor F and the lithium ore grade established in advance in the producing areas, or, because the lithium element has a large reaction section for neutrons compared with other elements, although the matrix material in the lithium ore is different, the influence of different matrix materials in the lithium ore on the reaction section for neutrons is not large, the neutron reaction section is mainly influenced by lithium elements in the lithium ore, so that the corresponding relation between the attribute factor F and the grade of the lithium ore is established in advance as a range of the grade of the lithium ore corresponding to each attribute factor F, for example, the corresponding relation between the attribute factor F of the lithium ore and the grade of the lithium ore is F ═ a + bx ± c, wherein x represents the upper limit and the lower limit of the grade range of the lithium ore, and therefore, the value of one attribute factor F of the lithium ore corresponds to one range of the grade of the lithium ore.
In the present application, the detectors include neutron detectors and photon detectors; the neutron detector is close to one side of the ore, and the photon detector is far away from one side of the ore; the target photon rays and the target neutron rays generated by the ray conversion target are emitted to the ore in a cone angle.
In this embodiment, fig. 6 is a schematic diagram of a detector in a neutron photon fusion ore sorting method according to an embodiment of the present application. Referring to fig. 6, in the present application, the grade separation can be directly performed on lithium ores with large sizes, the sizes of the lithium ores conveyed on the conveyor belt after mining are different, and the grade separation can be performed on all the mined lithium ores in order to ensure that the grade separation can be performed on all the mined lithium ores, so that the grade separation can be performed on lithium ores with small sizes as possible. Thus, the present application directs the target photon rays and the target neutron rays emitted from the target by the ray conversion to the lithium ore in a cone angle, where the detector-to-source distance (i.e., distance to the ray conversion target) D SD Greater than the distance D from the lithium ore to the source SO There is a magnification mechanism at the time of imaging so that the imaging resolution of the lithium ore will increase. For example, the detector itself has a position resolution of R D Then the position resolution corresponding to the sample is R D ×D SO /D SD . When R is D ＝3mm，D SD ＝3D SO During the process, the position resolution ratio of the lithium ore can reach 1mm, namely the lithium ore with the size of 1mm can be sorted, and the grade sorting of the more fine ore is facilitated.
At the same time, a neutron detector (i.e., in FIG. 6) 3 He or 10 BF 3 Proportional counter) is placed at the front side close to the lithium ore to absorb neutrons firstly, and due to the strong penetrating power of photon rays, the photon ray array detector is arranged behind the neutron detector, namely far away from the lithium ore, and the photon rays penetrate through the neutron detector and are measured by the photon ray array detector at the back side. This will further facilitate the accuracy of the detector in receiving both transmitted target photon rays and transmitted target neutron rays.
It should be understood that, in the above embodiments, the lithium ore with a size of 1mm can be sorted by way of example only, and the application is not limited to the application, the imaging resolution of ore grade sorting can be improved by directing the target photon rays and the target neutron rays to the lithium ore in a cone angle form, and the application is beneficial to grade sorting finer ores, and the application is not limited to the application, and only lithium ore with a size of 1mm can be sorted.
In the present application, the acceleration energy of the electron accelerator is 1.67MeV or more; the particle size range of the ore is 100 mu m to 5 cm; the ore grade measurement accuracy is 0.1%.
In this embodiment, in order for the target to generate both neutrons and photons, the energy of the electron accelerator must be ≧ 1.67 MeV. And when the energy of the electron accelerator is less than or equal to 7MeV, beryllium or heavy water is used as a conversion target material. When the energy of the accelerator is more than or equal to 7MeV, tantalum, tungsten and other materials are selected as conversion target materials. When the particle size of the lithium ore is less than or equal to 1cm, a neutron sensitive micro-channel detector can be used for simultaneously measuring neutrons and photon rays. Particles in lithium ore samples>At 1cm, can utilize 3 He or 10 BF 3 The detector measures neutrons and the scintillation or semiconductor, including CsI, CZT, CdTe, measures photons. The granularity range of grade separation of lithium ores can be 100 mu m-5 cm, and the grade separation precision of the ores can reach 0.1%.
In the present embodiment, the setting condition includes a specific value to which the content of lithium dioxide in lithium ore specified by the user needs to be reached. If a user wants to sort out lithium ore with the content of lithium dioxide in the lithium ore of 2% or more, when the content of the lithium dioxide in the lithium ore is determined to be more than or equal to 2% through the attribute factors of the lithium ore, the lithium ore is sorted out for subsequent ore extraction.
The ore separation method based on neutron photon fusion can be used for carrying out grade separation on lithium ores efficiently and at low cost. Meanwhile, the neutron rays are subjected to slowing-down treatment twice, so that the sorting accuracy can be effectively improved. By directing the target photon rays and the target neutron rays emitted by the ray conversion target toward the lithium ore in a cone angle, the fineness of ore sorting can be increased. The neutron detector is placed at the front side close to the lithium ore to absorb neutrons firstly, and the photon ray array detector is arranged behind the neutron detector, so that the accuracy of the detector for receiving the transmission target photon rays and the transmission target neutron rays is better, and the subsequently determined grade of the lithium ore is more accurate.
Another aspect of the present application further provides a neutron photon fused ore sorting system 700, and fig. 7 is a schematic diagram of a neutron photon fused ore sorting system according to an embodiment of the present application. Referring to fig. 7, the system 700 includes:
an electron accelerator 701 for accelerating electrons;
a radiation conversion target 702 for receiving bombardment of the accelerated electrons to generate target photon rays and target neutron rays;
a detector 703 for receiving transmitted target photon rays and transmitted target neutron rays transmitted through the ore after the target photon rays and the target neutron rays irradiate the ore, and receiving the target photon rays and the target neutron rays, and measuring respective count rates of the transmitted target photon rays and the transmitted target neutron rays;
an ore grade determining module 704, configured to determine an attribute factor of the ore according to respective count rates of the transmission target photon ray and the transmission target neutron ray, and respective count rates of the target photon ray and the target neutron ray, and determine an ore grade according to a corresponding relationship between the attribute factor and an ore grade and a preset attribute factor;
an ore sorting module 705, configured to determine the ore as a target ore for sorting when the grade of the ore satisfies a set condition. And the conveyor belt is used for conveying the lithium ores.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Optionally, the radiation conversion target comprises:
the ray generation module is used for converting electron bombardment rays generated by the electron accelerator into targets and generating neutron rays and target photon rays;
and the moderating processing module is used for performing moderating processing on the neutron rays to obtain target neutron rays.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The neutron photon fusion ore sorting method and system provided by the invention are introduced in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A neutron-photon fusion ore sorting method, comprising:
generating target photon rays and target neutron rays through a ray conversion target;
irradiating the ore with the target photon rays and the target neutron rays to obtain transmission target photon rays and transmission target neutron rays transmitted through the ore;
determining the grade of the ore according to the transmission target photon rays and the transmission target neutron rays transmitted through the ore and the target photon rays and the target neutron rays received by a detector;
and when the grade of the ore meets a set condition, determining the ore as a target ore for sorting.
2. The method of claim 1, wherein generating the target photon rays and the target neutron rays by a radiation conversion target comprises:
bombarding electrons generated by an electron accelerator to a target to generate neutron rays and target photon rays;
and carrying out moderation treatment on the neutron rays to obtain target neutron rays.
3. The method of claim 2, wherein the moderating the neutron rays to obtain target neutron rays comprises:
performing first collision moderation treatment on the neutron rays to obtain first neutron rays;
and carrying out secondary collision moderation treatment on the first neutron rays to obtain target neutron rays.
4. The method of claim 1, wherein said irradiating an ore with said target photon rays and said target neutron rays to obtain transmitted target photon rays and transmitted target neutron rays transmitted through said ore comprises:
target photon rays and target neutron rays are incident from one side of a conveyor belt to irradiate ore transported on the conveyor belt;
transmitted target photon rays and transmitted target neutron rays transmitted through the ore exit the other side of the conveyor belt.
5. The method of claim 1, wherein said determining a grade of said ore from said transmitted target photon rays and said transmitted target neutron rays transmitted through said ore and said target photon rays and said target neutron rays received by a detector comprises:
receiving transmission target photon rays and transmission target neutron rays through a detector, and measuring the respective counting rates of the transmission target photon rays and the transmission target neutron rays;
receiving the target photon rays and the target neutron rays through a detector, and measuring respective count rates of the target photon rays and the target neutron rays;
determining an attribute factor of the ore according to the respective count rates of the transmission target photon rays and the transmission target neutron rays and the respective count rates of the target photon rays and the target neutron rays;
and determining the ore grade according to the attribute factor and the corresponding relation between the preset attribute factor and the ore grade.
6. The method of claim 1, wherein the detectors include neutron detectors and photon detectors;
the neutron detector is close to one side of the ore, and the photon detector is far away from one side of the ore.
7. The method of claim 1, wherein the targeted photon and neutron rays generated by the radiation conversion target are cone-angle directed at the ore.
8. The method of claim 2, wherein the acceleration energy of the electron accelerator is 1.67MeV or more;
the particle size range of the ore is 100 mu m to 5 cm;
the grade measurement accuracy of the ore is 0.1%.
9. A neutron photon fused ore sorting system, the system comprising:
an electron accelerator for accelerating electrons;
the ray conversion target is used for receiving bombardment of the accelerated electrons to generate target photon rays and target neutron rays;
a detector for receiving transmitted target photon rays and transmitted target neutron rays transmitted through the ore after the target photon rays and the target neutron rays irradiate the ore, and receiving the target photon rays and the target neutron rays, and measuring respective count rates of the transmitted target photon rays and the transmitted target neutron rays;
an ore grade determining module, configured to determine an attribute factor of the ore according to respective count rates of the transmission target photon ray and the transmission target neutron ray, and the respective count rates of the target photon ray and the target neutron ray, and determine the ore grade according to a corresponding relationship between the attribute factor and an ore grade and a preset attribute factor;
and the ore sorting module is used for determining the ore as the target ore to sort when the grade of the ore meets the set condition.
10. The system of claim 9, wherein the radiation conversion target comprises:
the ray generation module is used for bombarding the electrons generated by the electron accelerator to the ray conversion target to generate neutron rays and target photon rays;
and the moderating processing module is used for performing moderating processing on the neutron rays to obtain target neutron rays.
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