Beneficiation method of iron, boron and uranium minerals in uranium-containing boron iron ore

Abstract

This invention discloses a beneficiation method for iron, boron, and uranium minerals in uranium-boron iron ore, which has the following characteristics: 1. The three-stage closed-circuit crushing product is laminated and pulverized using a high-pressure roller mill, so that the -5mm particle size content in the crushed product is greater than 70%. By utilizing the technology of multiple crushing and less grinding, the energy consumption of beneficiation can be reduced and the grinding efficiency can be improved; 2. Iron concentrate is obtained by staged grinding and staged magnetic separation. The tailings of iron beneficiation, such as the tailings of coarse magnetic separation, primary magnetic separation, and secondary magnetic separation, are subjected to stepwise gravity separation to obtain uranium concentrate and boron concentrate in stages, thereby improving the recovery rate of B2O3 and U in the boron and uranium concentrates and comprehensively utilizing iron, boron, and uranium resources; 3. The uranium minerals in the iron beneficiation tailings are separated by a combination of Nelson centrifugal concentrator, shaking table, and suspended cone concentrator, thereby improving the U recovery rate in the uranium concentrate. The Nelson centrifugal concentrator can be used for roughing of uranium minerals, the suspended cone concentrator can recover fine-grained uranium minerals, and the shaking table can recover relatively coarse-grained uranium minerals.

Description

Technical Field

[0001] This invention relates to a beneficiation method for iron, boron, and uranium minerals in uranium-boron iron ore, belonging to the field of mineral separation. Background Technology

[0002] Iron ore is a crucial raw material for steelmaking and is widely used in construction, machinery, automobiles, railways, shipbuilding, light industry, and home appliances. Boron ore is an important chemical mineral resource, widely used in the glass industry, ceramics industry, detergents, and agricultural fertilizers. Uranium ore is a vital strategic resource and energy mineral in my country, used in nuclear weapons and nuclear fuel. Uranium-boron-bearing iron ore is a multi-element associated sedimentary metamorphic mineral, with magnetite, borosilicate, and uranium ore being the main useful minerals. Improving the beneficiation technology of uranium-boron-bearing iron ore and comprehensively utilizing the iron, boron, and uranium minerals in it is of great significance for the comprehensive utilization of mineral resources.

[0003] In uranium-boron iron ore, the fine particle size of iron, boron, and uranium minerals, complex associated relationships, and low grades of useful elements are the main problems. Existing technologies employ a process of high-pressure roller mill lamination crushing, magnetic pre-selection, staged grinding, staged magnetic separation, hydrocyclone classification, and shaking table gravity separation to obtain iron, boron, and uranium concentrates. Currently, the recovery rates of TFe, B2O3, and U in iron, boron, and uranium concentrates are 89–91%, 19–21%, and 32–35%, respectively. The recovery rates of B2O3 and U in boron and uranium concentrates are low, and boron and uranium resources are severely lost. Summary of the Invention

[0004] Based on the differences in magnetism, specific gravity, and particle size among magnetite, boromagnesite, crystalline uranium ore, and other gangue minerals in uranium-boron iron ore, this invention aims to provide a method for obtaining iron concentrate, boron concentrate, and uranium concentrate using a three-stage closed-circuit crushing—high-pressure roller mill lamination—magnetic pre-selection—stage grinding—stage magnetic separation—magnetic tailings stepwise gravity separation process. This method improves the recovery rate of useful elements such as TFe, B2O3, and U in the concentrate, achieving efficient recovery of iron, boron, and uranium resources. The specific scheme is as follows:

[0005] A beneficiation method for iron, boron, and uranium minerals in uranium-boron iron ore includes the following steps:

[0006] Step 1: Taking uranium-boron-iron ore as the target, the raw ore is crushed using a three-stage closed-circuit crushing process. This process involves: feeding the raw ore into a coarse crushing unit; feeding the coarse crushed product into a medium crushing unit; feeding the medium and fine crushed products into a circular vibrating screen with a 12mm aperture to obtain +12mm oversize and -12mm undersize products; and feeding the +12mm oversize product into a fine crushing unit. The coarse crushing unit is a jaw crusher, while the medium and fine crushing units are cone crushers. The purpose and effect of this step is to use a three-stage closed-circuit crushing process to crush the raw ore, minimizing grinding and maximizing energy utilization.

[0007] Step 2: The -12mm undersize product from Step 1 is fed into a high-pressure roller mill for lamination and crushing. The product from the high-pressure roller mill is then wet-screened using a linear screen with a 5mm aperture, yielding an oversize +5mm product and an undersize -5mm product. The undersize -5mm product accounts for more than 70% of the screening feed. The oversize +5mm product is then separated using magnetic pulleys. The magnetic pulley concentrate is fed into the intermediate crushing plant, and the magnetic pulley tailings are used as construction ballast. The purpose and effect of this step is to minimize the ore particle size through the high-pressure roller mill, ensuring that the undersize -5mm product accounts for more than 70% of the screening feed.

[0008] Step 3: Take the -5mm particle size product from Step 2 and perform coarse magnetic separation using a drum magnetic separator to obtain coarse magnetic separation concentrate and coarse magnetic separation tailings. Then, perform magnetic scavenging separation on the coarse magnetic separation tailings using a drum magnetic separator to obtain coarse magnetic separation tailings scavenged concentrate and coarse magnetic separation tailings scavenged tailings. The coarse magnetic separation tailings scavenged concentrate is incorporated into the coarse magnetic separation concentrate. The purpose and effect of this step is to enrich iron minerals in the coarse magnetic separation concentrate and partially enrich boron and uranium minerals in the coarse magnetic separation tailings scavenged tailings through coarse magnetic separation, thus separating the iron minerals from the boron and uranium minerals.

[0009] Step 4: Take the coarse magnetic separation concentrate from Step 3 and perform a first-stage closed-circuit grinding and classification. The first-stage grinding equipment is an overflow ball mill, and the first-stage classification equipment is a hydrocyclone. The content of -0.074mm particles in the first-stage classification overflow is ≥60%.

[0010] Step 5: Take a section of the graded overflow from Step 4 and perform a first-stage magnetic separation using a drum magnetic separator to obtain a first-stage magnetic concentrate and a first-stage magnetic tailings. The obtained first-stage magnetic tailings are then subjected to magnetic scavenging to obtain a first-stage magnetic tailings scavenged concentrate and a first-stage magnetic tailings scavenged tailings. The first-stage magnetic tailings scavenged concentrate is then incorporated into the first-stage magnetic concentrate. The purpose and effect of this step is to enrich the iron concentrate in the first-stage magnetic concentrate through magnetic separation, thereby partially separating the iron minerals from the boron and uranium minerals.

[0011] Step 6: Take the magnetic separation concentrate from Step 5 and perform fine screening and regrinding. The fine screening equipment is a high-frequency vibrating fine screen, and the second-stage grinding equipment is an overflow ball mill. The oversize product obtained from the high-frequency vibrating fine screen is fed into the second-stage ball mill, and the second-stage grinding product is returned to the high-frequency vibrating fine screen. The undersize product obtained from the high-frequency vibrating fine screen has a -0.074mm particle size content of ≥80%.

[0012] Step 7: Take the undersize product from the high-frequency vibrating fine screen in Step 6 and perform two-stage magnetic separation using a drum magnetic separator to obtain a two-stage magnetic concentrate and a two-stage magnetic tailings. The two-stage magnetic concentrate is then subjected to a three-stage magnetic separation using a drum magnetic separator to obtain an iron concentrate. The three-stage magnetic tailings are returned to the high-frequency vibrating fine screen. The two-stage magnetic tailings are then subjected to magnetic scavenging using a drum magnetic separator to obtain a two-stage magnetic tailings scavenged concentrate and a two-stage magnetic tailings scavenged tailings. The two-stage magnetic tailings scavenged concentrate is returned to the high-frequency vibrating fine screen. The purpose and effect of this step is to obtain iron concentrate through three-stage magnetic separation, thereby partially separating iron minerals from boron and uranium minerals.

[0013] Step 8: Take the tailings from the coarse magnetic separation in Step 3 and classify them using a hydrocyclone to obtain a classification overflow and classification sand. The classification overflow is fed into a vibrating cone concentrator for gravity separation to obtain gravity concentrate I and gravity tailings I. Gravity concentrate I is uranium concentrate I. The classification sand is screened using a linear screen with a screen aperture of 0.5mm to obtain an oversize +0.5mm particle size product and an undersize -0.5mm particle size product. The oversize +0.5mm particle size product is construction sand. The purpose and effect of this step: The classification overflow of the coarse magnetic separation tailings is used for gravity separation in a vibrating cone concentrator to obtain uranium concentrate I.

[0014] Step 9: Take one magnetic tailings scavenging tailings from Step 5 and perform gravity separation using a Nelson centrifugal concentrator to obtain Nelson gravity concentrate I and Nelson gravity tailings I. Nelson gravity tailings I is boron concentrate I. Nelson gravity concentrate I and the -0.5mm particle size product from Step 9 are then subjected to shaking table gravity separation to obtain gravity concentrate II and gravity tailings II. Gravity concentrate II is uranium concentrate II. The purpose and effect of this step: one magnetic tailings scavenging tailings are separated into uranium concentrate II and boron concentrate I through Nelson centrifugal concentrator and shaking table gravity separation.

[0015] Step 10: Take the tailings from the second magnetic tailings scavenging process in Step 7 and perform gravity separation using a Nelson centrifugal concentrator to obtain Nelson gravity concentrate II and Nelson gravity tailings II. Nelson gravity tailings II is boron concentrate II. Boron concentrate I and boron concentrate II are combined into boron concentrate. Nelson gravity concentrate II is then subjected to gravity separation using a suspended conical concentrator to obtain gravity concentrate III and gravity tailings III. Gravity concentrate III is uranium concentrate III. Uranium concentrate I, uranium concentrate II, and uranium concentrate III are combined into uranium concentrate. Gravity tailings I, gravity tailings II, and gravity tailings III are combined into tailings. The purpose and effect of this step: The tailings from the second magnetic tailings scavenging process are separated into uranium concentrate III and boron concentrate II through Nelson centrifugal concentrator and suspended conical gravity separation.

[0016] The advantages of this invention are: it provides a method for obtaining iron concentrate, boron concentrate, and uranium concentrate through a three-stage closed-circuit crushing—high-pressure roller mill lamination pulverization—magnetic pre-selection—stage grinding—stage magnetic separation—magnetic tailings stepwise gravity separation process. The resulting iron concentrate has a TFe grade ≥ 54% and a TFe recovery rate ≥ 88%; the boron concentrate has a B2O3 grade ≥ 16% and a B2O3 recovery rate ≥ 48%; the overall iron concentrate has a B2O3 recovery rate ≥ 27% and a B2O3 recovery rate ≥ 75%; and the resulting uranium concentrate has a U grade ≥ 0.13% and a U recovery rate ≥ 60%. Compared with existing technologies, this invention improves the B2O3 grade and B2O3 recovery rate in the boron concentrate and the U grade and U recovery rate in the uranium concentrate, achieving comprehensive recovery and utilization of iron, boron, and uranium resources and reducing the waste of boron and uranium resources.

[0017] Key points of the invention

[0018] 1. The three-stage closed-circuit crushing product uses a high-pressure roller mill for lamination and crushing, so that the content of -5mm particles in the crushed product is greater than 70%. By using the technology of more crushing and less grinding, the energy consumption of mineral processing can be reduced and the grinding efficiency can be improved.

[0019] 2. Iron concentrate is obtained by staged grinding and staged magnetic separation. The tailings of iron beneficiation, such as the tailings of coarse magnetic separation, primary magnetic separation, and secondary magnetic separation, are subjected to stepwise gravity separation to obtain uranium concentrate and boron concentrate in stages. This improves the recovery rate of B2O3 and U in boron and uranium concentrates and makes comprehensive use of iron, boron and uranium resources.

[0020] 3. The Nelson centrifugal concentrator is used to separate boron and uranium from iron ore tailings. Boron minerals are enriched in the Nelson gravity separation tailings, while uranium minerals are enriched in the Nelson gravity separation concentrate. The separation efficiency of boron and uranium minerals is high. The combined use of the Nelson centrifugal concentrator, shaking table, and vibrating cone concentrator to separate uranium minerals from iron ore tailings improves the U recovery rate in the uranium concentrate. The Nelson centrifugal concentrator can roughen uranium minerals, the vibrating cone concentrator can recover fine-grained uranium minerals, and the shaking table can recover relatively coarse-grained uranium minerals. Attached Figure Description

[0021] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0022] The technical means, results and effects of the present invention will be described in detail below through examples.

[0023] Example 1

[0024] Step 1: Using uranium-boron iron ore as the target, a three-stage closed-circuit crushing process is used to crush the raw ore. The raw ore is fed into the coarse crushing equipment, the coarse crushing product is fed into the medium crushing equipment, and the medium crushing product and the fine crushing product are fed into a circular vibrating screen with a screen aperture size of 12mm to obtain the +12mm particle size product on the screen and the -12mm particle size product on the screen. The +12mm particle size product on the screen is fed into the fine crushing equipment. The coarse crushing equipment is a jaw crusher, and the medium crushing equipment and the fine crushing equipment are cone crushers.

[0025] Table 1 Content of major elements in raw ore

[0026] Element name TFe <![CDATA[B2O3]]> <![CDATA[SiO2]]> MgO <![CDATA[Al2O3]]> CaO S U content / % 26-30 6.0-7.5 16-20 22-26 1.1-1.6 0.8-1.2 1.0-1.4 0.004-0.006

[0027] Step 2: The undersize -12mm particle size product from Step 1 is fed into a high-pressure roller mill for lamination and crushing. The product from the high-pressure roller mill is wet-screened using a linear screen with a screen aperture of 5mm to obtain the oversize +5mm particle size product and the undersize -5mm particle size product. The undersize -5mm particle size product accounts for 72.13% of the screening feed. The oversize +5mm particle size product is separated by magnetic pulley. The magnetic pulley concentrate is fed into the intermediate crusher. The magnetic pulley tailings are construction ballast, which contains 5.17% TFe, 1.59% B2O3, and 0.0031% U.

[0028] Step 3: Take the -5mm particle size product from Step 2 and perform coarse magnetic separation using a drum magnetic separator to obtain coarse magnetic separation concentrate and coarse magnetic separation tailings. Perform magnetic scavenging separation on the coarse magnetic separation tailings using a drum magnetic separator to obtain coarse magnetic separation tailings scavenged concentrate and coarse magnetic separation tailings scavenged tailings. The coarse magnetic separation tailings scavenged concentrate is incorporated into the coarse magnetic separation concentrate.

[0029] Step 4: Take the coarse magnetic separation concentrate from Step 3 and perform a first-stage closed-circuit grinding and classification. The first-stage grinding equipment is an overflow ball mill, and the first-stage classification equipment is a hydrocyclone. The content of -0.074mm particles in the first-stage classification overflow is 61.32%.

[0030] Step 5: Take a section of the graded overflow from Step 4 and perform a first-stage magnetic separation using a drum magnetic separator to obtain a first-stage magnetic concentrate and a first-stage magnetic tailings. The first-stage magnetic tailings are then subjected to magnetic scavenging using a drum magnetic separator to obtain a magnetic tailings scavenged concentrate and a magnetic tailings scavenged tailings. The magnetic tailings scavenged concentrate is then incorporated into the first-stage magnetic concentrate.

[0031] Step 6: Take the magnetic separation concentrate from Step 5 and perform fine screening and regrinding. The fine screening equipment is a high-frequency vibrating fine screen, and the second-stage grinding equipment is an overflow ball mill. The oversize product obtained from the high-frequency vibrating fine screen is fed into the second-stage ball mill, and the second-stage grinding product is returned to the high-frequency vibrating fine screen. The content of -0.074mm particle size in the undersize product obtained from the high-frequency vibrating fine screen is 81.56%.

[0032] Step 7: Take the undersize product from the high-frequency vibrating fine screen in Step 6 and perform two-stage magnetic separation using a drum magnetic separator to obtain two-stage magnetic concentrate and two-stage magnetic tailings. The two-stage magnetic concentrate is then subjected to three-stage magnetic separation using a drum magnetic separator. The three-stage magnetic concentrate is an iron concentrate with a TFe grade of 54.03% and a TFe recovery rate of 89.76%, a B2O3 grade of 3.57% and a B2O3 recovery rate of 27.57%, a U grade of 0.0016% and a U recovery rate of 16.45%. The three-stage magnetic tailings are returned to the high-frequency vibrating fine screen. The two-stage magnetic tailings are then subjected to magnetic scavenging using a drum magnetic separator to obtain two-stage magnetic tailings scavenged concentrate and two-stage magnetic tailings scavenged tailings. The two-stage magnetic tailings scavenged concentrate is returned to the high-frequency vibrating fine screen.

[0033] Step 8: Take the tailings from the coarse magnetic separation in Step 3 and classify them using a hydrocyclone to obtain a classification overflow and classification sand. The classification overflow is fed into a suspended cone concentrator for gravity separation to obtain gravity concentrate I and gravity tailings I. Gravity concentrate I is uranium concentrate I, with a U grade of 0.1226% and a U recovery rate of 19.93%. The classification sand is screened using a linear screen with a screen aperture size of 0.5mm to obtain the oversize +0.5mm particle size product and the undersize -0.5mm particle size product. The oversize +0.5mm particle size product is building sand, with a TFe grade of 4.78%, a B2O3 grade of 2.20%, and a U grade of 0.0028%.

[0034] Step 9: Take one magnetic tailings scavenging tailings from Step 5 and perform gravity separation using a Nelson centrifugal concentrator to obtain Nelson gravity concentrate I and Nelson gravity tailings I. Nelson gravity tailings I is boron concentrate I, with a B2O3 grade of 15.48% and a B2O3 recovery rate of 35.30%. Nelson gravity concentrate I and the -0.5mm particle size product from Step 9 are then subjected to shaking table gravity separation to obtain gravity concentrate II and gravity tailings II. Gravity concentrate II is uranium concentrate II, with a U grade of 0.1403% and a U recovery rate of 24.84%.

[0035] Step 10: Take the tailings from the magnetic tailings scavenging process in Step 7 and perform gravity separation using a Nelson centrifugal concentrator to obtain Nelson gravity concentrate II and Nelson gravity tailings II. Nelson gravity tailings II is boron concentrate II, with a B2O3 grade of 18.74% and a B2O3 recovery rate of 12.87%. Boron concentrate I and boron concentrate II are combined to form boron concentrate, with a B2O3 grade of 16.23% and a B2O3 recovery rate of 48.17%. The overall iron concentrate has a B2O3 recovery rate of 27.57% and a total B2O3 recovery rate of 75.74%. Nelson gravity concentrate II is then subjected to gravity separation using a vibrating cone concentrator. The process yielded gravity concentrate III and gravity tailings III. Gravity concentrate III was uranium concentrate III, with a U grade of 0.1653% and a U recovery rate of 15.84%. Uranium concentrates I, II, and III were combined into uranium concentrate, with a U grade of 0.1392% and a U recovery rate of 60.61%. Gravity tailings I, II, and III were combined into tailings, with a TFe grade of 4.40% and a TFe recovery rate of 3.26%, a B2O3 grade of 5.95% and a B2O3 recovery rate of 20.46%, and a U grade of 0.0019% and a U recovery rate of 8.69%.

[0036] This example demonstrates a method for obtaining iron, boron, and uranium concentrates through a three-stage closed-circuit crushing process—high-pressure roller mill lamination—magnetic pre-selection—stage grinding—stage magnetic separation—and stepwise gravity separation of magnetic tailings, achieving comprehensive recovery of iron, boron, and uranium minerals. The resulting iron concentrate has a TFe grade of 54.03% and a TFe recovery rate of 89.76%, a B2O3 grade of 3.57% and a B2O3 recovery rate of 27.57%, and a U grade of 0.0016% and a U recovery rate of 16.45%. The boron concentrate has a B2O3 grade of 16.23% and a B2O3 recovery rate of 48.17%. The overall iron concentrate has a B2O3 recovery rate of 27.57% and a B2O3 recovery rate of 75.74%. The uranium concentrate has a U grade of 0.1392% and a U recovery rate of 60.61%. The beneficiation process flow for iron, boron, and uranium minerals in uranium-boron-bearing iron ore is shown below. Figure 1 The results of the beneficiation process for iron, boron, and uranium minerals in uranium-boron iron ore are shown in Table 2.

[0037] Table 2. Results of the mineral processing flow chart for uranium-boron-iron ore containing iron, boron, and uranium minerals in Example 1.

[0038]

[0039] Effects of the present invention

[0040] This invention describes a method for obtaining iron concentrate, boron concentrate, and uranium concentrate using a three-stage closed-circuit crushing—high-pressure roller mill lamination—magnetic pre-selection—stage grinding—stage magnetic separation—magnetic tailings stepwise gravity separation process, achieving comprehensive recovery of iron, boron, and uranium minerals. The obtained iron concentrate has a TFe grade ≥ 54% and a TFe recovery rate ≥ 88%; the boron concentrate has a B2O3 grade ≥ 16% and a B2O3 recovery rate ≥ 48%; the combined iron concentrate has a B2O3 recovery rate ≥ 27% and a B2O3 recovery rate ≥ 75%; and the obtained uranium concentrate has a U grade ≥ 0.13% and a U recovery rate ≥ 60%.

[0041] Compared with existing technologies, this invention utilizes a three-stage closed-circuit crushing—high-pressure roller mill lamination—magnetic pre-selection—stage grinding—stage magnetic separation—magnetic tailings stepwise gravity separation process to obtain iron concentrate, boron concentrate, and uranium concentrate, achieving comprehensive recovery of iron, boron, and uranium minerals. The resulting iron concentrate has a TFe grade ≥54% and a TFe recovery rate ≥88%; the boron concentrate has a B2O3 grade ≥16% and a B2O3 recovery rate ≥48%; the overall iron concentrate has a B2O3 recovery rate ≥27% and a B2O3 recovery rate ≥75%; and the resulting uranium concentrate has a U grade ≥0.13% and a U recovery rate ≥60%. This invention combines several mineral processing methods, including magnetic separation, Nelson centrifugal gravity separation, shaking table gravity separation, and suspended cone gravity separation, and considers the magnetic properties, specific gravity, and particle size distribution of various minerals to improve the recovery rate of B2O3 and U elements in boron and uranium concentrates. It provides a new method for the effective separation of iron, boron, and uranium minerals in uranium-boron iron ore and can provide guidance for existing uranium-boron iron ore beneficiation processes.

Claims

1. A method for beneficiating iron, boron, and uranium minerals in uranium-boron iron ore, characterized in that... Includes the following steps: Step 1: Using uranium-boron-containing iron ore as the target, the raw ore is crushed using a three-stage closed-circuit crushing process. The three-stage closed-circuit crushing process refers to: the raw ore is fed into the coarse crushing equipment, the coarse crushing product is fed into the medium crushing equipment, and the medium crushing product enters the fine crushing equipment; the medium crushing product and the fine crushing product are fed into a circular vibrating screen with a screen aperture size of 12mm to obtain the +12mm particle size product on the screen and the -12mm particle size product on the screen. The +12mm particle size product on the screen is fed into the fine crushing equipment. Step 2: Feed the undersize -12mm particle size product from Step 1 into a high-pressure roller mill for lamination and crushing. Use a linear screen to wet screen the product from the high-pressure roller mill with a screen size of 5mm to obtain the oversize +5mm particle size product and the undersize -5mm particle size product. Use a magnetic pulley to separate the oversize +5mm particle size product. Feed the magnetic pulley concentrate into the intermediate crushing equipment. Step 3: Take the -5mm particle size product from Step 2 and perform coarse magnetic separation using a drum magnetic separator to obtain coarse magnetic separation concentrate and coarse magnetic separation tailings. Perform magnetic scavenging separation on the coarse magnetic separation tailings using a drum magnetic separator to obtain coarse magnetic separation tailings scavenged concentrate and coarse magnetic separation tailings scavenged tailings. The coarse magnetic separation tailings scavenged concentrate is incorporated into the coarse magnetic separation concentrate. Step 4: Take the coarse magnetic separation concentrate from Step 3 and perform a closed-circuit grinding and classification process. The grinding equipment is an overflow ball mill, and the classification equipment is a hydrocyclone. The content of -0.074mm particles in the resulting first-stage classification overflow is ≥60%. Step 5: Take a section of the graded overflow from Step 4 and perform a first-stage magnetic separation using a drum magnetic separator to obtain a first-stage magnetic concentrate and a first-stage magnetic tailings. Perform magnetic scavenging on the obtained first-stage magnetic tailings to obtain a magnetic tailings scavenged concentrate and a magnetic tailings scavenged tailings. The magnetic tailings scavenged concentrate is then incorporated into the first-stage magnetic concentrate. Step 6: Take the magnetic separation concentrate from Step 5 and perform fine screening and regrinding. The fine screening equipment is a high-frequency vibrating fine screen, and the second-stage grinding equipment is an overflow ball mill. The oversize product obtained from the high-frequency vibrating fine screen is fed into the second-stage ball mill, and the second-stage grinding product is returned to the high-frequency vibrating fine screen. The undersize product obtained from the high-frequency vibrating fine screen has a -0.074mm particle size content of ≥80%. Step 7: Take the undersize product from the high-frequency vibrating fine screen in Step 6 and perform two-stage magnetic separation using a drum magnetic separator to obtain two-stage magnetic concentrate and two-stage magnetic tailings. The two-stage magnetic concentrate is then subjected to three-stage magnetic separation using a drum magnetic separator to obtain iron concentrate. The three-stage magnetic tailings are returned to the high-frequency vibrating fine screen. The two-stage magnetic tailings are then subjected to magnetic scavenging using a drum magnetic separator to obtain two-stage magnetic tailings scavenged concentrate and two-stage magnetic tailings scavenged tailings. The two-stage magnetic tailings scavenged concentrate is returned to the high-frequency vibrating fine screen. Step 8: Take the tailings from the coarse magnetic separation in Step 3 and classify them using a hydrocyclone to obtain a classification overflow and classification sand. The classification overflow is fed into a suspended cone concentrator for gravity separation to obtain gravity concentrate I and gravity tailings I. Gravity concentrate I is uranium concentrate I. The classification sand is screened using a linear screen with a screen aperture size of 0.5mm to obtain the +0.5mm particle size product and the -0.5mm particle size product. The +0.5mm particle size product is building sand. Step 9: Take one magnetic tailings scavenging tailings from Step 5 and use a Nelson centrifugal separator for gravity separation to obtain Nelson gravity concentrate I and Nelson gravity tailings I. Nelson gravity tailings I is boron concentrate I. Nelson gravity concentrate I and the -0.5mm particle size product under the screen from Step 9 are used for gravity separation on a shaking table to obtain gravity concentrate II and gravity tailings II. Gravity concentrate II is uranium concentrate II. Step 10: Take the tailings from the magnetic tailings scavenging process in Step 7 and perform gravity separation using a Nelson centrifugal concentrator to obtain Nelson gravity concentrate II and Nelson gravity tailings II. Nelson gravity tailings II is boron concentrate II. Boron concentrate I and boron concentrate II are combined into boron concentrate. Nelson gravity concentrate II is then subjected to gravity separation using a suspended conical concentrator to obtain gravity concentrate III and gravity tailings III. Gravity concentrate III is uranium concentrate III. Uranium concentrate I, uranium concentrate II, and uranium concentrate III are combined into uranium concentrate. Gravity tailings I, gravity tailings II, and gravity tailings III are combined into tailings.

2. The beneficiation method for iron, boron, and uranium minerals in uranium-boron-bearing iron ore according to claim 1, characterized in that: In step 1, the coarse crushing equipment is a jaw crusher, and the medium and fine crushing equipment are cone crushers.

3. The beneficiation method for iron, boron, and uranium minerals in uranium-boron-iron ore according to claim 1, characterized in that: In step 2, the tailings from the magnetic pulley separation are used as building ballast.

Images