CN-122006893-A - Magnetic-gravity combined classifying and sorting method for comprehensively recovering iron, uranium and boron in low-grade uranium-bearing boron-magnesium-iron ore

Abstract

The invention discloses a magnetic gravity combined classification method for comprehensively recovering iron, uranium and boron in low-grade uranium-bearing boron-magnesium-iron ore, which comprises the steps of carrying out multistage closed circuit crushing and wet screening on raw ore to obtain ore pulp of-5 mm, carrying out wet tailing discarding magnetic separation and scavenging to separate mixed concentrate, sequentially carrying out two-stage closed circuit grinding classification on concentrate, carrying out magnetic separation by matching with a gradient magnetic field and high-frequency screening purification to obtain iron concentrate powder, separating uranium-bearing boron tailings, grading by a multi-specification hydrocyclone, and carrying out gravity separation by combining with a KGS concentrator, a suspension vibration conical surface concentrator and a shaking table, so as to respectively recover uranium ores in tailings of different sources and obtain boron concentrate.

Inventors

• ZHANG HAO
• FENG WEI
• ZOU HONGWEI
• ZHANG SHUAI
• JIN YUEDONG
• Han Dongzhe
• GAO YANG
• WU YANG
• ZHANG HAIFENG

Assignees

• 辽宁首钢硼铁有限责任公司

Dates

Publication Date

20260512

Application Date

20260410

Claims (4)

1. 1. The magnetic-gravity combined classifying and sorting method for comprehensively recovering iron, uranium and boron in low-grade uranium-bearing ludwigite is used for treating the uranium-bearing ludwigite with TFe content of 22.5% -30%, B 2 O 3 grade of 4.2% -7.3% and U grade of 0.0004% -0.0005%, and is characterized by comprising the following steps: S1 crushing process Raw ore with the grain diameter of 300 mm-1000 mm is subjected to coarse crushing, medium crushing, dry screening, fine crushing and high-pressure roller grinding in sequence, the high-pressure roller grinding discharging material is mixed with water to prepare ore pulp, then wet screening is carried out, +5mm ore returns to the medium crushing to form a closed circuit, and the ore with the grain diameter of-5 mm enters the next flow; s2 wet type tail-throwing magnetic separation process Feeding the ore with the diameter of-5 mm obtained in the step S1 into a magnetic separator for wet tailing discarding magnetic separation to obtain concentrate A and tailings A, wherein the tailings A enter scavenging I and are magnetically separated to obtain tailings I, and the concentrate A enters a subsequent ore grinding process; S3 one-stage ore grinding-classifying-low intensity magnetic separation process The method comprises the steps of (1) grinding ore from concentrate A by ball milling I, feeding the ground product into a hydraulic grading first stage, and returning the sand setting of the hydraulic grading first stage to the ball milling first stage to form a closed circuit grinding system; S4 two-stage ore grinding-classifying-low intensity magnetic separation process Feeding the oversize material D into a concentration magnetic separator for magnetic separation, feeding concentrate of the concentration magnetic separator into a ball mill II for grinding, and feeding the discharged material of the ball mill II and tailings of the concentration magnetic separator together into high-frequency screening to form a closed circuit grinding system; S5 uranium ore and boron concentrate recovery process S5a tailings I are sent into a hydraulic grading second grade, settled sand of the hydraulic grading second grade enters a comprehensive tail, overflow is treated by a slag separation sieve, feeding undersize materials into a KGS concentrator for gravity separation, and feeding concentrate of the KGS concentrator into a suspension vibration conical surface concentrator for concentration to obtain uranium concentrate I; s5b, feeding tailings J of the scavenging II into a hydraulic classification third stage, feeding sand setting of the hydraulic classification third stage into a 90-table for separation to obtain uranium concentrate II, and feeding overflow into a hydraulic classification fifth stage; S5c, delivering tailings H into a hydraulic classification fourth stage, delivering settled sand of the hydraulic classification fourth stage into a 120 shaking table for separation to obtain uranium concentrate III, and delivering overflow into a hydraulic classification fifth stage; The discharged comprehensive tail is the final tailings, and the uranium concentrate I, the uranium concentrate II and the uranium concentrate III are combined into the final uranium concentrate.
2. 2. The method according to claim 1, wherein in the step S1, a jaw crusher is adopted for the rough crushing, a cone crusher is adopted for the medium crushing, a 45mm ore discharge port is adopted for the medium crushing, a double-layer circular vibrating screen is adopted for the dry screening, a screen hole is 12 mm-14 mm, a cone crusher is adopted for the fine crushing, a 20mm ore discharge port is adopted for the medium crushing, a high-pressure grinding pressure is set to 90bar, and a 5mm wet screening screen hole is adopted for the fine crushing.
3. 3. The method of claim 1, wherein in the step S3, the magnetic separation I is a cylindrical magnetic separator with the magnetic field intensity of 120KA/m to 165KA/m, the scavenging II is a cylindrical magnetic separator with the magnetic field intensity of 350KA/m to 500KA/m, and the high-frequency screening adopts five-layer high-frequency screens with the screen holes of 0.1mm.
4. 4. The method of claim 1, wherein in the step S5b, the third hydraulic classification step adopts a hydraulic cyclone with the diameter of 500mm, the diameter of a sand setting nozzle is 80mm, the working pressure is 0.08-0.11 mpa, in the step S5c, the fourth hydraulic classification step adopts a hydraulic cyclone with the diameter of 100mm, the diameter of the sand setting nozzle is 20mm, the working pressure is 0.08-0.11 mpa, the fifth hydraulic classification step adopts a hydraulic cyclone with the diameter of 350mm, the diameter of the sand setting nozzle is 70mm, and the working pressure is 0.18-0.25 mpa.

Description

Magnetic-gravity combined classifying and sorting method for comprehensively recovering iron, uranium and boron in low-grade uranium-bearing boron-magnesium-iron ore Technical Field The invention belongs to the field of mineral processing technology and mineral resource comprehensive utilization, and particularly relates to a magnetic gravity combined beneficiation method for comprehensively recovering three valuable components of iron, uranium and boron from low-grade and co-associated complex uranium-bearing boron-magnesium-iron ores. Background The uranium ore resource is a dual strategic support related to national energy safety and national defense safety, the strategic position of the uranium ore resource exceeds most mineral products such as rare earth, the uranium ore resource is a core 'strategic hard general cargo' of a large country game, the uranium ore resource is taken as a core fuel of nuclear energy, the uranium ore resource provides stable base charge power with the energy density which is millions times that of fossil fuel, the uranium ore resource is a key zero-carbon energy source for realizing a 'double-carbon' target, uranium-235 is a core raw material of strategic equipment such as a nuclear weapon and a nuclear submarine, and the national nuclear deterrence capability is directly determined. For China, a resource-technology-safety three-in-one uranium resource guarantee system is constructed, so that the system is not only a necessary choice for coping with global unbalance of supply and demand and risk of a supply chain, but also a core strategic support for realizing energy independence, maintaining national safety and pushing energy transformation. Liaoning Weng Quan paigeite mineral has complex composition types, iron ore mainly exists in magnetite, boron mainly exists in paigeite, a small amount of boron exists in paigeite, uranium mineral is crystalline uranium mineral, magnesium-containing mineral mainly exists in serpentine and phlogopite, and harmful elemental sulfur mainly exists in the forms of pyrrhotite and pyrite. Magnetite in ore has a finer particle size and a complex mosaic relationship with other minerals of interest, and it is expected that monomer formation is difficult to complete even by fine grinding, and it is suggested to sort it by a stage grinding-stage magnetic separation process. Uranium minerals in the ore are mainly crystalline uranium ores, are irregularly granular or fine granular, are filled along the edges, inter-grains or cracks of magnetite, paigeite and serpentine, and the magnetite in the cracks of the individual coarse particles is in fine pulse filling distribution. In general, the ore has low content of crystalline uranium, high dispersion degree and fine granularity, and has a close relationship with magnetite, paigeite and serpentine. The original uranium separation process is that the two sections of ore grinding and iron separation tailings are classified and then are separated by a sand setting table, and because the uranium separation process is positioned at the tail end of the whole ore separation process, the front end loss is larger, the yield and the yield are lower, and the yield of subsequent hydrometallurgy products are limited, therefore, a brand new ore separation process which can intervene in advance and accurately capture the fine-grained uranium ores lost early in the process and realize the co-efficient recovery of iron, uranium and boron is developed, and the brand new ore separation process has become the urgent technical requirement for solving the utilization bottleneck of strategic co-associated mineral resources of the type Disclosure of Invention In order to solve the problems, the invention discloses a magnetic-gravity combined classification method for comprehensively recovering iron, uranium and boron in low-grade uranium-bearing boron-magnesium-iron ores. The specific technical scheme is as follows: A magnetic gravity combined classification method for comprehensively recovering iron, uranium and boron in low-grade uranium-containing boron-containing magnesium-iron ore is used for treating the uranium-containing boron-containing magnesium-iron ore with TFe content of 22.5% -30%, B2O3 grade of 4.2% -7.3% and U grade of 0.0004% -0.0005%, and is realized by the following steps: S1 crushing process Raw ore with the grain diameter of 300 mm-1000 mm is subjected to coarse crushing, medium crushing, dry screening, fine crushing and high-pressure roller grinding in sequence, the high-pressure roller grinding discharging material is mixed with water to prepare ore pulp, then wet screening is carried out, +5mm ore returns to the medium crushing to form a closed circuit, and the ore with the grain diameter of-5 mm enters the next flow; s2 wet type tail-throwing magnetic separation process Feeding the ore with the diameter of-5 mm obtained in the step S1 into a magnetic separator for wet tailing discarding magnetic separat