CN115400980A - Oil shale sorting method and device - Google Patents
Oil shale sorting method and device Download PDFInfo
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- CN115400980A CN115400980A CN202211359333.4A CN202211359333A CN115400980A CN 115400980 A CN115400980 A CN 115400980A CN 202211359333 A CN202211359333 A CN 202211359333A CN 115400980 A CN115400980 A CN 115400980A
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- 239000004058 oil shale Substances 0.000 title claims abstract description 219
- 239000000463 material Substances 0.000 claims abstract description 166
- 238000005481 NMR spectroscopy Methods 0.000 claims abstract description 81
- 239000001257 hydrogen Substances 0.000 claims abstract description 61
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 61
- 230000000875 corresponding Effects 0.000 claims abstract description 48
- 239000012141 concentrate Substances 0.000 claims abstract description 40
- 238000000926 separation method Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
- 239000011707 mineral Substances 0.000 abstract description 2
- 239000007921 spray Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 238000005188 flotation Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
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- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 210000001519 tissues Anatomy 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the technical field of mineral processing, in particular to an oil shale sorting method and device. The method comprises the following steps: measuring the hydrogen content of each oil shale material; detecting each oil shale material to be detected through nuclear magnetic resonance, and measuring the relaxation time and nuclear magnetic resonance signal intensity of the corresponding oil shale material; judging whether the hydrogen content in the corresponding oil shale material is smaller than a first preset value or not according to the relaxation time of the oil shale material and the nuclear magnetic resonance signal intensity; and marking the oil shale material with the hydrogen content larger than or equal to the first preset value as concentrate, and marking the oil shale material with the hydrogen content smaller than the first preset value as tailing. The higher the hydrogen content in the oil shale material, the higher the oil content in the oil shale material. This application is based on the material characteristic of wanting the screening, through the hydrogen content in the oil shale material, discerns and judges that the oil shale material is concentrate or tailing, has the recognition accuracy height, selects separately high-efficient and advantage with low costs.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to an oil shale sorting method and device.
Background
The oil shale is a sedimentary rock containing combustible organic matters, and shale oil, dry distillation gas and shale semicoke can be obtained by performing dry distillation at the low temperature of about 500 ℃. The method for preparing shale oil from oil shale is low-temperature carbonization at 500 ℃, but if the content of inorganic minerals in the oil shale is high, a large amount of energy is consumed during heating, so that the energy consumption is increased, the efficiency is reduced, and the conversion of kerogen is not facilitated due to the existence of a large amount of inorganic minerals, so that the oil content of the oil shale required by carbonization is more than 5 percent, and the higher the oil content is, the better the oil content is. The existing oil shale separation method comprises a dense medium separation method and a flotation separation method. The dense medium separation method is used for separating the oil shale through a dense medium cyclone, and the dense medium separation method is high in cost and poor in separation effect. The flotation separation method comprises the steps of crushing and sieving the oil shale by using a universal crusher, and mixing the oil shale with water to form ore pulp; adjusting the ph value of the ore pulp, starting a flotation machine, introducing air into the ore pulp at a certain speed, and collecting foam products on the ore pulp; after the flotation is stopped, filtering, dehydrating and drying the foam product (concentrate) and the tailings to obtain oil shale concentrate and tailings; the efficiency of the flotation separation method mainly depends on the collecting agent, and the oil shale mainly takes aluminosilicate clay ore, so that the selectivity is poor, the recovery rate is low, the flotation effect is not obvious, the flotation effect is greatly influenced by the particle size distribution, the control is not easy, and the cost is high.
The traditional oil shale sorting method is low in recognition accuracy and difficult to effectively sort the oil shale. Therefore, how to select the rock with high oil content from the oil shale becomes the challenge of the practitioner.
Disclosure of Invention
The first purpose of the invention is to provide the oil shale sorting method which is high in recognition accuracy, efficient in sorting and low in cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the oil shale sorting method comprises the following steps:
performing nuclear magnetic resonance detection on each oil shale material to be detected, and measuring the relaxation time and nuclear magnetic resonance signal intensity of the corresponding oil shale material;
judging whether the hydrogen content in the corresponding oil shale material is smaller than a first preset value or not according to the relaxation time of the oil shale material and the nuclear magnetic resonance signal intensity, marking the oil shale material to be detected with the hydrogen content larger than or equal to the first preset value as concentrate, and marking the oil shale material to be detected with the hydrogen content smaller than the first preset value as tailing.
Further, the steps of: judging whether the hydrogen content in the corresponding oil shale material is less than a first preset value according to the relaxation time and the nuclear magnetic resonance signal intensity of the oil shale material, wherein the judgment comprises the following steps:
drawing a relaxation time spectrogram by taking the nuclear magnetic resonance signal intensity of the oil shale material as a vertical coordinate and the relaxation time of the oil shale material as a horizontal coordinate;
calculating the peak area of a set peak in the relaxation time spectrogram; the set peak is a peak corresponding to a preset relaxation time constant T;
and judging whether the hydrogen content in each oil shale material is less than a first preset value or not according to the peak area.
Further, the steps of: judging whether the hydrogen content in each oil shale material is less than a first preset value or not according to the peak area, and the method comprises the following steps:
measuring a second preset value, wherein the second preset value is a peak area corresponding to the set peak of the oil shale material when the hydrogen content in the oil shale material is at the first preset value;
and comparing the peak area of each oil shale material to be detected with a second preset value, marking the oil shale material of which the peak area is greater than or equal to the second preset value as concentrate, and marking the oil shale material of which the peak area is less than the second preset value as tailing.
Further, the relaxation time is the transverse relaxation time of the oil shale material to be detected.
Further, the preset relaxation time constant T is a transverse relaxation time constant T2 of the relaxation time spectrum at 10 ms.
Further, the steps of: detecting each oil shale material to be detected through nuclear magnetic resonance, comprising:
and sequentially conveying each oil shale material into a nuclear magnetic resonance coil, wherein the nuclear magnetic resonance coil is used for performing nuclear magnetic resonance on the oil shale materials passing through the nuclear magnetic resonance coil.
Further, after the step of identifying the corresponding oil shale material as concentrate or tailing, the method also comprises the following steps:
separating the concentrate from the tailings.
Further, the steps of: separating the concentrate from the tailings, comprising:
and a plurality of oil shale materials are sequentially conveyed to a separation device through a conveying belt, and the separation device removes the oil shale materials identified as concentrate or tailings from the conveying belt.
The second purpose of the invention is to provide the oil shale sorting device which has high recognition precision, high sorting efficiency and low cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
an oil shale sorting device comprises a nuclear magnetic resonance coil, a signal receiver and identification equipment;
the nuclear magnetic resonance coil is used for performing nuclear magnetic resonance on the oil shale material passing through the nuclear magnetic resonance coil; the signal receiver is used for detecting a relaxation time signal and a nuclear magnetic resonance intensity signal of the corresponding oil shale material and transmitting the relaxation time signal and the nuclear magnetic resonance intensity signal to the identification equipment; and the identification equipment marks the corresponding oil shale material as concentrate or tailings according to the relaxation time signal and the nuclear magnetic resonance intensity signal.
Further, the device also comprises a conveying belt and a separating device;
the conveying belt penetrates through the nuclear magnetic resonance coil, and the oil shale material is placed on the conveying belt and conveyed into the nuclear magnetic resonance coil through the conveying belt;
the separation equipment is arranged at the tail end of the conveying belt and used for separating the tailings and the concentrate.
The invention has the beneficial effects that:
the invention provides an oil shale sorting method and a device, and the method comprises the following steps: performing nuclear magnetic resonance detection on each oil shale material to be detected, and measuring the relaxation time and nuclear magnetic resonance signal intensity of the corresponding oil shale material; judging whether the hydrogen content in the corresponding oil shale material is smaller than a first preset value or not according to the relaxation time of the oil shale material and the nuclear magnetic resonance signal intensity, marking the oil shale material with the hydrogen content larger than or equal to the first preset value as concentrate, and marking the oil shale material with the hydrogen content smaller than the first preset value as tailing. The prior art oil shale sorting methods are all based on the density of the material. Compared with the existing oil shale sorting method, the method provided by the application utilizes the hydrogen content in the oil shale material to identify the quality of the oil shale, and the higher the hydrogen content in the oil shale material is, the higher the oil content in the oil shale material is. This application is based on the material characteristic that will filter, through the hydrogen content in the oil shale material, discerns and judges that the oil shale material is concentrate or tailing, has that the discernment precision is high, select separately high-efficient and advantage with low costs.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an oil shale sorting apparatus provided in a second embodiment of the present invention;
fig. 2 is a transverse relaxation time spectrum of an oil shale sample in the oil shale sorting method according to the first embodiment of the present invention.
Icon:
1-an oil shale material; 2-nuclear magnetic resonance coil; 3-a signal receiver; 4, conveying a belt; 5-separation equipment; 51-a gas cylinder; 52-a spray head; 53-a pipe; 54-control valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should be noted that, in the description of the present invention, the terms "connected" and "mounted" should be interpreted broadly, for example, they may be fixedly connected, detachably connected, or integrally connected; can be directly connected or connected through an intermediate medium; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example one
The embodiment provides an oil shale sorting method, which comprises the following steps:
detecting each oil shale material to be detected through nuclear magnetic resonance, and measuring the relaxation time and nuclear magnetic resonance signal intensity of the corresponding oil shale material;
judging whether the hydrogen content in the corresponding oil shale material is smaller than a first preset value or not according to the relaxation time of the oil shale material and the nuclear magnetic resonance signal intensity, marking the oil shale material 1 with the hydrogen content larger than or equal to the first preset value as concentrate, and marking the oil shale material 1 with the hydrogen content smaller than the first preset value as tailing.
The oil-containing substance in the oil shale is kerogen, the main component of which is aliphatic hydrocarbon, and the aliphatic hydrocarbon contains a large amount of hydrogen element, so that the high or low of the oil content in the oil shale can be identified by detecting the high or low of the hydrogen content in the oil shale.
The prior art oil shale sorting methods are all based on the density of the material. Compared with the existing oil shale sorting method, the method provided by the application utilizes the hydrogen content in the oil shale material 1 to identify the quality of the oil shale, and the higher the hydrogen content in the oil shale material 1 is, the higher the oil content in the oil shale material 1 is. This application is based on the material characteristic that will filter, through the size of hydrogen content in the comparison oil shale material 1 with first default, discerns and judges that oil shale material 1 is concentrate or tailing, has the advantage that the discernment precision is high, select separately high-efficient and with low costs.
Further, the steps of: judging whether the hydrogen content in the corresponding oil shale material is less than a first preset value according to the relaxation time and the nuclear magnetic resonance signal intensity of the oil shale material, wherein the judgment comprises the following steps:
drawing a relaxation time spectrogram by taking the nuclear magnetic resonance signal intensity of the oil shale material 1 as a vertical coordinate and the relaxation time of the oil shale material 1 as a horizontal coordinate;
calculating the peak area of a set peak in the relaxation time spectrogram; the set peak is a peak corresponding to a preset relaxation time constant T;
and judging whether the hydrogen content in each oil shale material is less than a first preset value or not according to the peak area.
The method comprises the following steps: detecting each oil shale material to be detected through nuclear magnetic resonance, comprising: and sequentially feeding each oil shale material 1 into the nuclear magnetic resonance coil 2, wherein the nuclear magnetic resonance coil 2 can perform nuclear magnetic resonance on the oil shale materials 1 passing through the nuclear magnetic resonance coil.
Relaxation refers to the phenomenon that when the atomic nucleus resonates and is in a high-energy state, the atomic nucleus can be rapidly restored to an original low-energy state after the radio-frequency pulse is stopped, and the restoration process is called as a relaxation process. The relaxation process is performed in two steps, i.e. the process of restoring the longitudinal magnetization vector Mz to the initial equilibrium state and the process of decaying the transverse magnetization vector Mxy to zero, which are started simultaneously but performed independently.
The process by which Mz returns from a minimum to its original size is called longitudinal relaxation, which is a reflection of spin-lattice relaxation, or T1 relaxation. Its speed is expressed by the time constant T1, i.e. the relaxation time that the longitudinal magnetization vector undergoes to return from a minimum to 63% of the equilibrium state. There is a difference in the intensity of the signal produced for different tissues at different T1 times.
Mxy is called transverse relaxation by the process of maximum gradual disappearance, which is a reflection of spin-spin relaxation, also called T2 relaxation. T2 is the transverse relaxation time constant, which is equal to the time it takes for the transverse magnetization vector to decay from a maximum to 37%, a measure of how fast the transverse magnetization of the tissue decays.
Because the time used in the longitudinal relaxation process is short, it is difficult to detect the longitudinal relaxation time, and therefore, in this embodiment, the relaxation time is the transverse relaxation time of the oil shale material to be detected, in the steps: and in the process of measuring the relaxation time of the corresponding oil shale material, measuring the transverse relaxation time of the corresponding oil shale material. Correspondingly, after measuring the transverse relaxation time of the corresponding oil shale material, drawing a transverse relaxation time spectrogram by taking the nuclear magnetic resonance signal intensity of the oil shale material 1 as a vertical coordinate and the transverse relaxation time of the oil shale material 1 as a horizontal coordinate; the set peak is a peak corresponding to a preset transverse relaxation time constant T2.
Further, the steps of: judging whether the hydrogen content in each oil shale material is less than a first preset value or not according to the peak area, and the method comprises the following steps:
measuring a second preset value, wherein the second preset value is a peak area of the set peak corresponding to the oil shale material 1 when the hydrogen content in the oil shale material 1 is at the first preset value;
and comparing the peak area of each oil shale material 1 to be detected with a second preset value, marking the oil shale material 1 with the peak area larger than or equal to the second preset value as concentrate, and marking the oil shale material 1 with the peak area smaller than the second preset value as tailing.
In this embodiment, the second preset value is: when the hydrogen content in the oil shale material 1 is at a first preset value, the peak area of a corresponding peak at the position of a transverse relaxation time constant T2 is preset in a transverse relaxation time spectrogram of the corresponding oil shale material 1.
In the transverse relaxation time spectrogram of the oil shale material 1, a certain corresponding relation exists between the peak area of a peak corresponding to a preset relaxation time constant T and the hydrogen content, and the larger the peak area of the oil shale material 1 is, the higher the hydrogen content of the corresponding oil shale material 1 is. Therefore, whether the hydrogen content in the oil shale material 1 is smaller than the first preset value or not can be identified by measuring the peak area of each oil shale material 1 to be detected and comparing the measured peak area with the second preset value. Specifically, when the peak area of the oil shale material 1 is greater than or equal to a second preset value, and the hydrogen content of the oil shale material 1 is greater than or equal to a first preset value, the corresponding oil shale material 1 is concentrate; when the peak area of the oil shale material 1 is smaller than a second preset value, and the hydrogen content of the oil shale material 1 is smaller than a first preset value, the corresponding oil shale material 1 is tailings.
Further, in the step: after the corresponding oil shale material is identified to be concentrate or tailings, the method further comprises the following steps:
separating the concentrate from the tailings.
In this embodiment, the steps are: separating the concentrate from the tailings, comprising:
the oil shale materials 1 are respectively conveyed to a separation device 5 in sequence through a conveying belt 4, and the separation device 5 removes the oil shale materials 1 identified as concentrate or tailings from the conveying belt 4.
As an alternative embodiment, the separation device 5 comprises an air bottle 51, a spray head 52, a pipeline 53 connecting the air bottle 51 and the spray head 52, and a control valve 54 arranged on the pipeline 53, wherein the air sprayed by the spray head 52 can blow the tailings or the concentrate off the conveying belt 4, and the tailings and the concentrate are separated through the difference of the falling positions of the tailings and the concentrate.
Referring to fig. 1, a nuclear magnetic resonance coil 2, a signal receiver 3 and a separating device 5 are sequentially arranged along a conveying direction of a conveying belt 4, and the conveying belt 4 penetrates through the nuclear magnetic resonance coil 2; during detection, the conveying belt 4 conveys the oil shale material 1 into the nuclear magnetic resonance coil 2, and the nuclear magnetic resonance coil 2 enables the oil shale material 1 to perform nuclear magnetic resonance; then, the oil shale material 1 is conveyed to a signal receiver 3, the signal receiver 3 detects a relaxation time signal and a nuclear magnetic resonance intensity signal of the corresponding oil shale material 1, and transmits the relaxation time signal and the nuclear magnetic resonance intensity signal to a recognition device; the identification equipment draws a transverse relaxation time spectrogram according to the relaxation time of the oil shale material 1 and the nuclear magnetic resonance signal intensity, and calculates the peak area of a preset peak in the transverse relaxation time spectrogram of the corresponding oil shale material 1; then, the identification equipment compares the peak area of the oil shale material 1 with a second preset value, and the oil shale material 1 is marked as concentrate or tailings according to a comparison result; finally, the marked oil shale material 1 is conveyed to the separation equipment 5, when the tailings are conveyed to the separation equipment 5, the control end sends out an instruction, the control valve 54 works, and the spray nozzle 52 sprays gas to blow the tailings off the conveying belt 4.
The identification device may include an intelligent computer, and the drawing of the transverse relaxation time spectrogram and the calculation of the peak area of the preset peak in the transverse relaxation time spectrogram are automatically completed by the intelligent computer.
The present application is explained below based on actual detection results.
Selecting 5 oil shale samples, and respectively marking the 5 oil shale samples as: a first sample, a second sample, a third sample, a fourth sample, and a fifth sample; and respectively detecting the oil content in the 5 oil shale samples, and obtaining that the oil content in the first sample, the second sample, the third sample, the fourth sample and the fifth sample is reduced in sequence according to the detection result.
Sequentially placing 5 oil shale samples on a conveying belt 4, and sequentially conveying the 5 oil shale samples to a nuclear magnetic resonance coil 2 by the conveying belt 4; the hydrogen element in the sample passing through the nuclear magnetic resonance coil 2 is subjected to relaxation reaction under the action of nuclear magnetic resonance, and when the corresponding sample is conveyed to the signal receiver 3, the signal receiver 3 detects a relaxation time signal and a nuclear magnetic resonance intensity signal of the sample and transmits the relaxation time signal and the nuclear magnetic resonance intensity signal to the identification device.
The recognition equipment takes the nuclear magnetic resonance signal intensity of the sample as a vertical coordinate, takes the transverse relaxation time of the oil shale sample as a horizontal coordinate, and draws a transverse relaxation time spectrogram, namely the attached drawing 2. As shown in fig. 2, the oil shale samples with different oil contents have obvious signal intensity difference.
Referring to fig. 2, although the T2 signal intensity less than 1ms is more obvious, the T2 signal less than 1ms is difficult to capture, and the requirement on the accuracy of the signal receiver 3 is high, therefore, in consideration of detection cost and difficulty, in this embodiment, the preset relaxation time constant T is the transverse relaxation time constant T2 of the relaxation time spectrogram at 10ms, and the peak area of the peak corresponding to the transverse relaxation time constant T2 at 10ms in the relaxation time spectrogram is measured, so as to distinguish the oil content of the oil shale.
On the basis of detecting the peak area at a relaxation time of 10ms, the speed of the conveyor belt 4 may be set to 3m/s, and the signal receiver 3 may be set under the conveyor belt 4 at a distance of 3cm from the nmr coil.
Through experiments, in 5 oil shale samples, the hydrogen content in the first sample is 0.87% (in the embodiment, the hydrogen content is the ratio of hydrogen element to the weight of the oil shale material 1), and the peak area of the peak corresponding to the transverse relaxation time constant T2 at 10ms in a relaxation time spectrogram is 1690; the hydrogen content in the second sample is 0.83%, the peak area is 1674; the hydrogen content in the third sample was 0.45%, the peak area was 1450; the hydrogen content in the fourth sample was 0.23%, the peak area was 1386; the hydrogen content in the fifth sample was 0.12%, and the peak area was 1294. According to the experimental result, the larger the peak area of the oil shale material 1 is, the higher the hydrogen content of the oil shale material 1 is, and correspondingly, the higher the oil content of the oil shale material 1 is.
In this embodiment, the oil shale with the peak area of 1500 (i.e. the second preset value) is selected as the sorting limit, and the ore is classified according to the calculated result. Marking the oil shale material 1 with the peak area larger than or equal to 1500 as a concentrate; and marking the oil shale material 1 with the peak area smaller than 1500 as tailings.
Because the hydrogen content in the oil shale material 1 is higher, the oil content in the oil shale material 1 is also higher, therefore, the application sorts the oil shale material 1 by comparing the hydrogen content of each oil shale material 1 with a first preset value. However, the method for directly measuring the hydrogen content of the oil shale material 1 has the disadvantages of tedious process, high cost and long time, and can not quickly divide a plurality of oil shale materials 1 to be measured into concentrate with the hydrogen content more than or equal to a first preset value and tailings with the hydrogen content less than the first preset value.
Based on this, the applicant finds that, through experiments, a certain corresponding relationship exists between the hydrogen content in the oil shale material 1 and the peak area of the corresponding peak at the preset relaxation time constant T in the relaxation time spectrogram measured by the oil shale material 1, that is, the larger the peak area of the oil shale material 1 is, the higher the hydrogen content of the oil shale material 1 is. Therefore, before the identification and sorting according to the sorting method of the application, a second preset value of the oil shale to be sorted (that is, a peak area of a set peak in a relaxation time spectrogram of the corresponding oil shale material 1 when the hydrogen content in the oil shale material 1 is at the first preset value) needs to be determined through experiments, and a measured value of the oil shale material 1 to be sorted is compared with the second preset value and is marked as concentrate or tailing. The separation method provided by the application can be used for effectively separating large batches of oil shale materials and has the advantages of high identification precision, low cost, high efficiency and the like.
Example two
The embodiment provides an oil shale sorting device, which comprises a nuclear magnetic resonance coil 2, a signal receiver 3 and identification equipment;
the nuclear magnetic resonance coil 2 is used for performing nuclear magnetic resonance on the oil shale material 1 passing through the inside of the nuclear magnetic resonance coil; the signal receiver 3 is used for detecting a relaxation time signal and a nuclear magnetic resonance intensity signal of the corresponding oil shale material 1 and transmitting the relaxation time signal and the nuclear magnetic resonance intensity signal to the recognition equipment; and the identification equipment marks the corresponding oil shale material 1 as concentrate or tailings according to the relaxation time signal and the nuclear magnetic resonance intensity signal.
Further, the apparatus also comprises a conveyor belt 4 and a separating device 5; the conveying belt 4 penetrates through the nuclear magnetic resonance coil 2, and the oil shale material 1 is placed on the conveying belt 4 and conveyed into the nuclear magnetic resonance coil 2 through the conveying belt 4; the separation equipment 5 is arranged at the end of the conveyor belt 4 for separating the tailings from the concentrate.
Specifically, the separation equipment 5 comprises an air bottle 51, a spray head 52, a pipeline 53 connecting the air bottle 51 and the spray head 52, and a control valve 54 arranged on the pipeline 53, wherein the tailings can be blown off from the conveying belt 4 by the gas sprayed by the spray head 52.
With reference to the accompanying drawings, the nuclear magnetic resonance coil 2, the signal receiver 3 and the separation equipment 5 are sequentially arranged along the conveying direction of the oil shale material 1, the oil shale material 1 passing through the nuclear magnetic resonance coil 2 and the signal receiver 3 is marked as concentrate or tailings by the identification equipment, when the tailings are conveyed to the separation equipment 5, the control end sends an instruction, the control valve 54 works, and the spray head 52 sprays gas to blow the tailings off the conveying belt 4.
Optionally, the device further comprises a tailing recycling frame, the spray nozzle 52 and the tailing recycling frame are respectively arranged on two sides of the conveying belt 4, and tailings blown down from the conveying belt 4 fall into the tailing recycling frame, so that workers can conveniently recycle the tailings.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The oil shale sorting method is characterized by comprising the following steps:
performing nuclear magnetic resonance detection on each oil shale material to be detected, and measuring the relaxation time and nuclear magnetic resonance signal intensity of the corresponding oil shale material;
judging whether the hydrogen content in the corresponding oil shale material is smaller than a first preset value or not according to the relaxation time of the oil shale material and the nuclear magnetic resonance signal intensity; and marking the oil shale material to be detected with the hydrogen content larger than or equal to the first preset value as concentrate, and marking the oil shale material to be detected with the hydrogen content smaller than the first preset value as tailings.
2. The oil shale sorting method of claim 1, wherein the steps of: judging whether the hydrogen content in the corresponding oil shale material is less than a first preset value according to the relaxation time and the nuclear magnetic resonance signal intensity of the oil shale material, wherein the judgment comprises the following steps:
drawing a relaxation time spectrogram by taking the nuclear magnetic resonance signal intensity of the oil shale material as a vertical coordinate and the relaxation time of the oil shale material as a horizontal coordinate;
calculating the peak area of a set peak in the relaxation time spectrogram; the set peak is a peak corresponding to a preset relaxation time constant T;
and judging whether the hydrogen content in each oil shale material is less than a first preset value or not according to the peak area.
3. The oil shale sorting method of claim 2, wherein the steps of: judging whether the hydrogen content in each oil shale material is less than a first preset value or not according to the peak area, and the method comprises the following steps:
measuring a second preset value, wherein the second preset value is a peak area corresponding to the set peak of the oil shale material when the hydrogen content in the oil shale material is at the first preset value;
and comparing the peak area of each oil shale material to be detected with a second preset value, marking the oil shale material of which the peak area is greater than or equal to the second preset value as concentrate, and marking the oil shale material of which the peak area is less than the second preset value as tailing.
4. The oil shale sorting method of claim 2, wherein the relaxation time is a transverse relaxation time of the oil shale material to be tested.
5. The oil shale sorting method of claim 4, wherein the preset relaxation time constant T is a transverse relaxation time constant T2 of the relaxation time spectrum at 10 ms.
6. The oil shale sorting method of claim 1, wherein the steps of: detecting each oil shale material to be detected through nuclear magnetic resonance, comprising:
and sequentially conveying each oil shale material into a nuclear magnetic resonance coil, wherein the nuclear magnetic resonance coil is used for carrying out nuclear magnetic resonance on the oil shale material passing through the nuclear magnetic resonance coil.
7. The oil shale sorting method of claim 1, further comprising, after the step of identifying the corresponding oil shale material as concentrate or tailings, the step of:
separating the concentrate from the tailings.
8. The oil shale sorting method of claim 7, wherein the steps of: separating the concentrate from the tailings, comprising:
and respectively and sequentially conveying the plurality of oil shale materials to a separation device through a conveying belt, and removing the oil shale materials identified as concentrate or tailings from the conveying belt by the separation device.
9. An oil shale sorting device for implementing the oil shale sorting method of any one of claims 1 to 6, which is characterized by comprising a nuclear magnetic resonance coil, a signal receiver and an identification device;
the nuclear magnetic resonance coil is used for performing nuclear magnetic resonance on the oil shale material passing through the nuclear magnetic resonance coil; the signal receiver is used for detecting a relaxation time signal and a nuclear magnetic resonance intensity signal of the corresponding oil shale material and transmitting the relaxation time signal and the nuclear magnetic resonance intensity signal to the identification equipment; and the identification equipment marks the corresponding oil shale material as concentrate or tailings according to the relaxation time signal and the nuclear magnetic resonance intensity signal.
10. The oil shale sorting apparatus of claim 9, further comprising a conveyor belt and a separation device;
the conveying belt penetrates through the nuclear magnetic resonance coil, and the oil shale material is placed on the conveying belt and conveyed into the nuclear magnetic resonance coil through the conveying belt;
the separation equipment is arranged at the tail end of the conveying belt and used for separating the tailings and the concentrate.
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