X-ray intelligent pre-selection method for low-grade rare earth-fluorite resources

Abstract

The invention belongs to the technical field of rare earth and fluorite beneficiation, and particularly relates to an X-ray intelligent pre-selection method for low-grade rare earth-fluorite resources. At present, the flotation property of rare earth minerals in a Bayan obo mining area is close to that of fluorite or other calcium-containing minerals, a good separation effect can be obtained only through high selected grade and monomer dissociation degree, and the recovery effect of a common separation method on low-grade ores is limited. Therefore, according to the property of the raw ore or the sorting target, the grading sorting process and the specific threshold value are set in the X-ray intelligent pre-selection system, the specific threshold value is REO larger than or equal to 5% or CaF2 larger than or equal to 15%, and rare earth and fluorite in the rare earth-fluorite resource discarded minerals can be screened out at the same time. The grading separation is divided into first-stage separation (separation for one time), second-stage separation (separation for two times) or third-stage separation (separation for three times), a corresponding threshold value is set for each time of separation, and enrichment and separation of fluorite and rare earth resources in the discarded minerals can be achieved at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of rare earth and fluorite beneficiation, and in particular relates to a method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources. Background Art

[0002] Rare earth and fluorite are important strategic mineral resources in my country. The Bayan Obo area has large-scale iron, rare earth and fluorite polymetallic symbiotic deposits that are rare in the world. The proven iron ore reserves are 1.46 billion tons; the prospective reserves of rare earth resources are 135 million tons, ranking first in the world; the prospective reserves of niobium resources are 6.6 million tons, ranking second in the world; the prospective reserves of fluorite are 130 million tons. The mine also contains rich thorium, scandium, potassium-rich slate and other resources. The resource reserves are huge and the development potential is broad. Due to the complex mineral composition, the close co-existence relationship between valuable minerals and gangue, and the similar beneficiation properties (specific gravity, specific magnetic susceptibility, surface characteristics or electrical properties) between ores, the comprehensive recovery of the mine by conventional mineral processing methods has always been a world-class problem.

[0003] At present, the Bayan Obo mining area uses gravity separation-strong magnetic separation-flotation process to recover iron, rare earth and fluorite. After rare earth minerals and fluorite are enriched by gravity separation and strong magnetic separation processes, they are recovered in turn by flotation. Since the flotation properties of rare earth minerals are similar to those of fluorite or other calcium-containing minerals, a higher entry grade and monomer dissociation degree are required to obtain a good separation effect. Therefore, this method has limited recovery effect on low-grade ores. With the gradual exploitation of the mining area over the past few decades, shallow resources have become increasingly depleted, resulting in a decrease in ore grade and an increase in mining and selection costs. The recycling of valuable metals in low-grade ores and mining surrounding rocks has become a trend.

[0004] After searching, it is found that among the existing relevant patents, the pre-selection methods of low-grade fluorite or rare earths are generally only for a single mineral, and are difficult to apply to complex multi-metallic ores or multi-metallic surrounding rocks. For example, patent CN112090480A discloses a dry pre-selection system for low-grade fluorite and its use method, which mainly improves the grade of a single mineral through XRT intelligent pre-selection technology. However, this type of technology has shortcomings when dealing with complex multi-metallic ores or multi-mineral surrounding rocks, and cannot take into account the simultaneous sorting and recovery of multiple minerals.

[0005] Patent CN202310743411.9 discloses a method for recovering rare earth minerals, niobium minerals and fluorite minerals from Bayan Obo tailings. This method utilizes the magnetic differences between minerals and sequentially adopts permanent magnetic separation, electromagnetic magnetic separation, superconducting magnetic separation combined with flotation to achieve the recovery of rare earth, niobium and fluorite resources in tailings, effectively improving product quality and resource utilization. However, the process of this method is relatively complicated, the water and electricity energy consumption is high, and the magnetic differences between several minerals are small, making it difficult to obtain a good sorting effect. Summary of the invention

[0006] To solve the above problems, the present invention provides a method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources, which aims to recover rare earth and fluorite in low-grade polymetallic ores or waste minerals, while improving the grade of the minerals before entering the mill, reducing the grinding cost, and improving the efficiency of mineral processing operations and the comprehensive recovery rate of resources.

[0007] The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources described in the present invention comprises the following contents: according to the properties of rare earth-fluorite resources or the sorting target, a grading and sorting process is set in the X-ray intelligent pre-selection system, and corresponding sorting thresholds are set according to different grading and sorting processes, so that the available rare earth and fluorite in the rare earth-fluorite resources can be screened out at the same time;

[0008] The separation threshold is REO≥5% or CaF2≥15%, the rare earth grade in the rare earth-fluorite resource is <5% and the CaF2 grade in the fluorite is <15%; the rare earth-fluorite resource refers to the low-grade polymetallic ore or waste minerals in the Bayan Obo area, and the waste minerals include rare earth polymetallic waste minerals and spoil dump surrounding rocks. (REO means rare earth grade, CaF2≥15% means CaF2 grade in fluorite is ≥15%)

[0009] The grading and sorting is divided into primary sorting, secondary sorting or tertiary sorting.

[0010] If the classification and sorting is set to primary sorting, then sorting is performed once, and the sorting threshold is REO ≥ 6% or CaF2 ≥ 17%. The primary sorting concentrate is the usable rare earth and fluorite, and the rare earth / fluorite-containing ore is quickly classified and enriched;

[0011] Furthermore, when set as primary sorting, the sorting threshold is REO≥6% or CaF2≥25%.

[0012] If the graded sorting is set to secondary sorting, it will be sorted twice; the threshold of the first sorting is REO ≥ 5% or CaF2 ≥ 20%, and the separated first sorting concentrate is subjected to secondary sorting, the threshold of the second sorting is REO ≥ 7% or CaF2 ≥ 25%, and the REO or CaF2 threshold of the second sorting is greater than the threshold of the first sorting, and the obtained secondary sorting concentrate is the usable rare earth and fluorite; the secondary sorting can further remove impurities to improve the grade of the target mineral.

[0013] If the graded sorting is set to three-level sorting, it is sorted three times; the threshold of the first sorting is REO≥10% or CaF2≥20%, and the first sorting concentrate is separated; the first sorting concentrate is sorted for the second time, the threshold of the second sorting is REO≥30%, and the REO threshold of the second sorting is greater than the REO threshold of the first sorting, and after the second sorting, the secondary sorting rare earth concentrate and tailings are obtained; the tailings are sorted for three times, the threshold of the third sorting is CaF2≥50%, and the CaF2 threshold of the third sorting is greater than the CaF2 threshold of the first sorting, and the third-level sorting fluorite concentrate is obtained after three sorting.

[0014] When set to three-stage sorting, the first sorting quickly classifies and enriches the rare earth / fluorite-containing ore, the second sorting enriches and separates the rare earth concentrate, which is the usable rare earth, and the third sorting enriches and separates the fluorite concentrate, which is the usable fluorite; that is, by adjusting the sorting level and threshold parameters, the enrichment and separation of rare earth and fluorite are achieved at the same time.

[0015] The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources described in the present invention comprises the following contents:

[0016] (1) Crushing: crushing rare earth-fluorite resources to a particle size of ≤90 mm;

[0017] (2) Screening: Use a vibrating screen to screen the crushed rare earth-fluorite resources, and the material on the screen is used as the sorting feed;

[0018] (3) Sorting: According to the properties of rare earth-fluorite resources or the sorting target, a grading and sorting process is set in the X-ray intelligent pre-selection system, and corresponding sorting thresholds are set according to different grading and sorting processes, and the usable rare earths and fluorites in the rare earth-fluorite resources are screened out at the same time.

[0019] The device for crushing in step (1) comprises a jaw crusher, a cone crusher or a roll crusher;

[0020] The vibrating screen in step (2) uses a standard screen with a mesh size of 9.5 mm to 90 mm;

[0021] In step (3), the classification and sorting is divided into primary sorting, secondary sorting or tertiary sorting, and the sorting threshold is REO≥5% or CaF2≥15%.

[0022] The main equipment used for sorting in step (3) is as follows: storage bin, vibrating feeder, conveyor belt, X-ray generator, identification system and blowing system;

[0023] The specific sorting method is as follows: After the material in the storage bin is fed into the vibrating feeder, it is transported to the X-ray generator along the conveyor belt for scanning and identification, and the target minerals and waste rocks are accurately identified. After the identification data is processed by the identification system, the injection system accurately sprays according to the processing results to separate the target minerals from the waste rocks and introduce them into the designated material tanks respectively, thereby obtaining concentrates (that is, usable rare earths and fluorite) and tailings.

[0024] This method uses X-ray intelligent pre-selection technology and sets specific sorting thresholds to achieve simultaneous enrichment or separation of multiple target minerals. It is particularly suitable for the efficient recovery of rare earths and fluorite in low-grade polymetallic ores and waste minerals, significantly reducing production costs and improving resource utilization, which is of great significance to improving the quality and efficiency of enterprises.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention can effectively separate rare earth and fluorite by setting threshold ranges suitable for different ore samples, and is suitable for the recovery of low-grade polymetallic ores or surrounding rocks. It has lower requirements on the grade of minerals to be selected, and can realize accurate identification and simultaneous enrichment of multiple minerals. Compared with traditional gravity separation, flotation and magnetic separation processes, the separation efficiency is higher and the accuracy is stronger;

[0027] 2. The present invention effectively improves the grade of minerals to be selected by accurately discarding surrounding rocks or gangue, reduces the amount of grinding in subsequent ball milling operations, and greatly reduces energy consumption and steel consumption in the mineral processing process, thereby achieving the purpose of energy saving and consumption reduction and significantly improving economic benefits;

[0028] 3. The present invention adopts full-process dry sorting technology, which does not require ore cleaning, does not use chemicals during the sorting process, does not produce wastewater pollution, is green and environmentally friendly, and avoids the environmental problems caused by traditional wet processes.

[0029] In summary, the present invention realizes the simultaneous and efficient separation of rare earth and fluorite by setting an adjustable separation threshold. Compared with the existing mineral processing technology, it has wider applicability, higher separation accuracy and more significant energy-saving and environmental protection advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic flow chart of the X-ray intelligent pre-selection method for low-grade rare earth-fluorite resources of the present invention, wherein: 1-storage bin, 2-vibrating feeder, 3-conveyor belt, 4-X-ray generator, 5-identification system, 6-blowing device, 7-gas cylinder, 8-tailings, 9-concentrate. DETAILED DESCRIPTION

[0031] The technical scheme of the present invention is clearly and completely described below in conjunction with the embodiments and the accompanying drawings. It should be pointed out that the embodiments described in the present invention are only used to further explain and illustrate, rather than to limit the scope of application. Based on the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the protection scope of the present invention.

[0032] The process of the X-ray intelligent pre-selection method in each embodiment is as follows: Figure 1 shown.

[0033] The embodiment of the present invention uses rare earth-fluorite resources (including low-grade polymetallic ores, rare earth-polymetallic waste minerals and surrounding rocks of the dump) in the Bayan Obo area as samples. In the rare earth-fluorite resources of the embodiment: 3%≤REO<5%, 8%≤CaF2 grade in fluorite<15%. In the actual sorting process, the sorting level and sorting threshold can be determined according to the REO grade and CaF2 grade of the ore to be sorted, the type and target grade of the concentrate to be obtained after sorting, etc., to meet the needs of actual production.

[0034] Example 1

[0035] One-stage sorting is adopted, and the threshold value is REO ≥ 5% or CaF2 ≥ 15%.

[0036] In a certain rare earth and polymetallic waste ore, the REO grade is 3.93%, and the CaF2 grade in fluorite is 8.82%.

[0037] Step (1): crushing the waste minerals into particles ≤ 70 mm using a jaw crusher;

[0038] Step (2): Screening: The crushed ore is screened using a vibrating screen, and the material on the sieve with an aperture of 50 mm is used as the sorting feed, and the material under the sieve is treated as the medium ore separately;

[0039] Step (3): Sorting, using an X-ray intelligent pre-selector to sort the ore, the ore is fed into a vibrating feeder 2 through a storage bin 1, and the vibrating feeder 2 slowly and evenly spreads the ore onto a conveyor belt 3, the material is conveyed to an X-ray generator 4 through the belt for scanning and identification, the identification data is processed by an identification system 5 and then output to a computing system, the sorting level set in the X-ray intelligent pre-selection system is a first-level sorting, and the sorting grade threshold is REO ≥ 5% or CaF2 ≥ 15%. When the material passes through the injection system (including the injection device 6 and the gas cylinder 7), the injection device 6 will perform gas injection according to the judgment result of the system, so that the target mineral and the waste rock fall into the designated material storage tank respectively, and the enriched concentrate 9 (i.e., the usable rare earth and fluorite) and the tailings 8 are obtained.

[0040] The REO grade of the enriched concentrate obtained after sorting is 7.40%, the REO recovery rate is 52.12%, the CaF2 grade in the fluorite is 18.61%, and the CaF2 recovery rate is 58.35%.

[0041] Example 2

[0042] One-stage sorting is adopted, and the threshold value is REO ≥ 6% or CaF2 ≥ 25%.

[0043] In a certain rare earth and polymetallic waste ore, the REO grade is 3.54%, and the CaF2 grade in fluorite is 12.21%.

[0044] Step (1): crushing the waste minerals to a particle size of ≤50 mm using a cone crusher;

[0045] Step (2): Screening: The crushed ore is screened using a vibrating screen machine, and the material on the sieve with an aperture of 20 mm is used as the sorting feed, and the material under the sieve is treated as the medium ore separately;

[0046] Step (3): sorting. The sorting level set in the X-ray intelligent pre-selection system is primary sorting, and the sorting grade threshold is REO ≥ 6% or CaF2 ≥ 25%. The specific method of sorting is the same as that in Example 1.

[0047] The REO grade of the enriched concentrate obtained after sorting is 6.90%, the REO recovery rate is 48.18%, the CaF2 grade in the fluorite is 29.05%, and the CaF2 recovery rate is 52.73%.

[0048] Example 3

[0049] One-stage sorting is adopted, and the threshold value is REO ≥ 6% or CaF2 ≥ 17%.

[0050] In a certain rare earth and polymetallic waste ore, the REO grade is 3.57%, and the CaF2 grade in fluorite is 10.12%.

[0051] Step (1): crushing the waste minerals to a particle size of ≤60 mm using a double-roll crusher;

[0052] Step (2): Screening: The crushed ore is screened using a vibrating screen, and the material on the sieve with a 30 mm aperture is used as the sorting feed, and the material under the sieve is treated as the medium ore separately;

[0053] Step (3): sorting. The sorting level set in the X-ray intelligent pre-selection system is primary sorting. The sorting grade threshold is REO ≥ 6% or CaF2 ≥ 17%. The specific method of sorting is the same as that in Example 1.

[0054] The REO grade of the enriched concentrate obtained after sorting is 6.83%, the REO recovery rate is 48.25%, the CaF2 grade in the fluorite is 18.82%, and the CaF2 recovery rate is 46.88%.

[0055] Example 4

[0056] Two-stage sorting is adopted, the first sorting threshold is REO≥5% or CaF2≥20%, and the second sorting threshold is REO≥7% or CaF2≥25%.

[0057] In a certain rare earth and polymetallic waste ore, the REO grade is 4.04%, and the CaF2 grade in fluorite is 12.21%.

[0058] Step (1): crushing the waste minerals into particles ≤ 50 mm using a jaw crusher;

[0059] Step (2): Screening: The crushed ore is screened using a vibrating screen machine, and the material on the sieve with an aperture of 20 mm is used as the sorting feed, and the material under the sieve is treated as the medium ore separately;

[0060] Step (3): sorting. The sorting level set in the X-ray intelligent pre-selection system is secondary sorting. The grade threshold set in the first sorting is REO ≥ 5% or CaF2 ≥ 20%. The concentrate obtained after the first sorting enters the secondary sorting for further enrichment. The grade threshold set in the secondary sorting is REO ≥ 7% or CaF2 ≥ 25%. The specific method of sorting is the same as that in Example 1.

[0061] The REO grade of the enriched concentrate obtained after secondary separation is 8.10%, the REO recovery rate is 43.38%, the CaF2 grade in the fluorite is 29.05%, and the CaF2 recovery rate is 47.71%.

[0062] Example 5

[0063] Two-stage sorting is adopted, the first sorting threshold is REO≥5% or CaF2≥20%, and the second sorting threshold is REO≥7% or CaF2≥30%.

[0064] In the surrounding rock of a certain dump: the REO grade is 3.17%, and the CaF2 grade in fluorite is 14.56%;

[0065] Step (1): crushing the surrounding rock of the dump with a jaw crusher to a particle size of ≤60 mm;

[0066] Step (2): Screening: The crushed ore is screened using a vibrating screen, and the material on the sieve with a 30 mm aperture is used as the sorting feed, and the material under the sieve is treated as the medium ore separately;

[0067] Step (3): sorting. The sorting level set in the X-ray intelligent pre-selection system is secondary sorting. The grade threshold set in the primary sorting is REO ≥ 5% or CaF2 ≥ 20%. The concentrate obtained after the primary sorting enters the secondary sorting for further enrichment. The grade threshold set in the secondary sorting is REO ≥ 7% or CaF2 ≥ 30%. The specific method of sorting is the same as that in Example 1.

[0068] The REO grade of the enriched concentrate obtained after secondary separation is 7.23%, the REO recovery rate is 52.33%, the CaF2 grade in the fluorite is 37.21%, and the CaF2 recovery rate is 60.17%.

[0069] Example 6

[0070] A three-stage sorting is adopted, with the first sorting threshold being REO ≥ 10% or CaF2 ≥ 20%, the second sorting threshold being REO ≥ 30%, and the third sorting threshold being CaF2 ≥ 50%.

[0071] In a rare earth and fluorite mixed ore: REO grade is 4.85%, CaF2 grade in fluorite is 14.88%;

[0072] Step (1): crushing the mixed ore into a particle size of ≤50 mm using a jaw crusher;

[0073] Step (2): Screening: The crushed ore is screened using a vibrating screen machine, and the material on the sieve with an aperture of 20 mm is used as the sorting feed, and the material under the sieve is treated as the medium ore separately;

[0074] Step (3): sorting. The sorting level set in the X-ray intelligent pre-selection system is three-level sorting; the grade threshold value of the first sorting is set to REO ≥ 10% or CaF2 ≥ 20%, and the concentrate obtained after the first sorting enters the secondary sorting to sort rare earths. The grade threshold value of the secondary sorting is set to REO ≥ 30%. After the secondary sorting, rare earth concentrate and tailings are obtained. The tailings enter the tertiary sorting to sort fluorite. The grade threshold value of the tertiary sorting is set to CaF2 ≥ 50% to obtain fluorite concentrate. The specific method of sorting is the same as that in Example 1.

[0075] The REO grade of the rare earth concentrate obtained after the secondary sorting is 31.21%, and the REO recovery rate is 20.14%. The CaF2 grade of the fluorite concentrate obtained after the tertiary sorting is 55.35%, and the CaF2 recovery rate is 40.26%.

[0076] Comparative Example 1

[0077] One-stage sorting is adopted, and the threshold value is REO ≥ 4% or CaF2 ≥ 10%.

[0078] In a certain rare earth and polymetallic waste ore, the REO grade is 3.77%, and the CaF2 grade in fluorite is 10.41%.

[0079] Step (1): crushing the waste minerals into particles ≤ 60 mm using a jaw crusher;

[0080] Step (2): Screening: The crushed ore is screened using a vibrating screen, and the material on the screen with a pore size of 40 mm is used as the sorting feed, and the material under the screen is treated as the medium ore separately;

[0081] Step (3): sorting. The sorting grade threshold set in the X-ray intelligent pre-selection system is REO ≥ 4% or CaF2 ≥ 10%. The specific method of sorting is the same as that in Example 1.

[0082] The REO grade of the enriched concentrate obtained after sorting is 4.88%, the REO recovery rate is 55.67%, the CaF2 grade in the fluorite is 12.43%, and the CaF2 recovery rate is 60.71%.

[0083] Comparative Example 2

[0084] One-stage sorting is adopted, and the threshold value is REO ≥ 3% or CaF2 ≥ 13%.

[0085] In a rare earth and polymetallic waste ore, the REO grade is 3.06%, and the CaF2 grade in fluorite is 12.83%.

[0086] Step (1): crushing the waste minerals into particles ≤ 60 mm using a jaw crusher;

[0087] Step (2): Screening: The crushed ore is screened using a vibrating screen, and the material on the sieve with a 30 mm aperture is used as the sorting feed, and the material under the sieve is treated as the medium ore separately;

[0088] Step (3): sorting. The sorting level set in the X-ray intelligent pre-selection system is primary sorting, and the sorting grade threshold is REO ≥ 3% or CaF2 ≥ 13%. The specific method of sorting is the same as that in Example 1.

[0089] The REO grade of the enriched concentrate obtained after sorting is 3.23%, the REO recovery rate is 60.34%, the CaF2 grade in the fluorite is 15.57%, and the CaF2 recovery rate is 71.34%.

Claims

1. A method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources, characterized in that: The method includes the following: setting a grading and sorting process in the X-ray intelligent pre-selection system, and setting corresponding sorting thresholds according to different grading and sorting processes, so as to simultaneously screen out the available rare earth and fluorite in the rare earth-fluorite resources; The sorting threshold is REO≥5% or CaF2≥15%, the rare earth grade in the rare earth-fluorite resources is <5% and the CaF2 grade in the fluorite is <15%; the rare earth-fluorite resources refer to low-grade polymetallic ores or waste minerals in the Bayan Obo area, and the waste minerals include rare earth polymetallic waste minerals and spoil dump surrounding rocks.

2. The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources according to claim 1 is characterized in that: The grading and sorting is divided into primary sorting, secondary sorting or tertiary sorting.

3. The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources according to claim 2 is characterized in that: If the grading and sorting is set to primary sorting, it is sorted once, and the sorting threshold is REO ≥ 6% or CaF2 ≥ 17%. The primary sorting concentrate is the usable rare earth and fluorite.

4. The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources according to claim 2 is characterized in that: If the grading and sorting is set to primary sorting, it is sorted once, and the sorting threshold is REO ≥ 6% or CaF2 ≥ 25%. The primary sorting concentrate is the usable rare earth and fluorite.

5. The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources according to claim 2, characterized in that: If the classification and sorting is set to secondary sorting, the sorting will be done twice; The threshold for the primary sorting is REO ≥ 5% or CaF2 ≥ 20%. The separated primary sorting concentrate is subjected to secondary sorting. The threshold for the secondary sorting is REO ≥ 7% or CaF2 ≥ 25%. The REO or CaF2 threshold for the secondary sorting is greater than the threshold for the primary sorting. The secondary sorting concentrate is the usable rare earth and fluorite.

6. The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources according to claim 2, characterized in that: If the classification and sorting is set to three-level sorting, the sorting will be done three times; The threshold of primary separation is REO ≥ 10% or CaF2 ≥ 20%, and the primary separation concentrate is separated; The primary sorting concentrate is subjected to secondary sorting, the threshold of the secondary sorting is REO ≥ 30%, and the REO threshold of the secondary sorting is greater than the REO threshold of the primary sorting, and secondary sorting rare earth concentrate and tailings are obtained after the secondary sorting; The tailings are sorted three times, the threshold of the three-stage sorting is CaF2 ≥ 50%, and the CaF2 threshold of the three-stage sorting is greater than the CaF2 threshold of the first-stage sorting, and after the three-stage sorting, a three-stage sorted fluorite concentrate is obtained; The secondary sorted rare earth concentrate is the usable rare earth, and the tertiary sorted fluorite concentrate is the usable fluorite.

7. A method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources according to any one of claims 1 to 6, characterized in that: Includes the following: (1) Crushing: crushing rare earth-fluorite resources; (2) Screening: Screen the crushed rare earth-fluorite resources, and use the screened materials as sorting feed; (3) Sorting: The grading and sorting process is set in the X-ray intelligent pre-selection system, and the corresponding sorting thresholds are set according to different grading and sorting processes, so as to simultaneously screen out the usable rare earths and fluorite in the rare earth-fluorite resources.

8. The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources according to claim 7, characterized in that: The crushing device in step (1) includes a jaw crusher, a cone crusher or a roller crusher, and the rare earth-fluorite resource is crushed to a particle size of ≤90 mm; the screening in step (2) uses a standard sieve with a mesh size of 9.5 mm to 90 mm.

9. The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources according to claim 7, characterized in that: In step (3), the classification and sorting is divided into primary sorting, secondary sorting or tertiary sorting, and the sorting threshold is REO≥5% or CaF2≥15%.

10. The method for X-ray intelligent pre-selection of low-grade rare earth-fluorite resources according to claim 7, characterized in that: The main equipment used for sorting in step (3) is as follows: storage bin, vibrating feeder, conveyor belt, X-ray generator, identification system and blowing system; The specific sorting method is as follows: After the material in the storage bin is fed into the vibrating feeder, it is transported to the X-ray generator along the conveyor belt for scanning and identification of target minerals and waste rocks. After the identification data is processed by the identification system, the injection system accurately sprays according to the processing results to separate the target minerals from the waste rocks, thus obtaining usable rare earths and fluorite.

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