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CN-121972288-A - Resource treatment process for grading and gradient recovery of lepidolite ore thickness

CN121972288ACN 121972288 ACN121972288 ACN 121972288ACN-121972288-A

Abstract

The invention relates to a recycling treatment process for lepidolite ore thickness grading step recovery, which comprises the following steps of screening by adopting a linear screen, grinding and grading oversize materials, feeding graded overflow into a weak magnetic roller for deironing, feeding non-magnetic materials after deironing into a first cyclone through a cloth slide gravity separation and a shaking table procedure, feeding the cloth slide tailings into a first cyclone to obtain a first cyclone underflow and overflow, taking the first cyclone underflow as a coarse fraction raw material, feeding the coarse fraction flotation tailings into a coarse fraction flotation operation, carrying out high-gradient magnetic separation on the coarse fraction flotation tailings, feeding the first cyclone overflow into a first deep cone thickener for concentration, feeding the first cyclone overflow into a second cyclone to obtain underflow and overflow, feeding the second cyclone into a fine fraction flotation operation, and combining coarse fraction flotation concentrate and fine fraction flotation concentrate. The method can remarkably improve the recovery rate of the lepidolite and obtain various mineral products with high-grade values, thereby remarkably improving the comprehensive utilization rate of lithium resources.

Inventors

  • QIU ZHENZHONG
  • YI CHEN
  • LAI HUIBIN
  • XU FAGEN
  • XIAO YANFEI
  • DENG LIN

Assignees

  • 宜丰永洲锂业科技有限公司

Dates

Publication Date
20260505
Application Date
20260330

Claims (10)

  1. 1. The recycling treatment process for the lepidolite ore thickness grading step recovery is characterized by comprising the following steps of: Step S1, raw ore in a powder ore bin is fed into a linear sieve for sieving, the aperture of the sieve is controlled to be 1mm, and undersize and oversize are respectively obtained after sieving; Step S2, feeding the oversize product obtained in the step S1 into a first ball mill for grinding, feeding the ground ore product and the undersize product obtained in the step S1 into a spiral classifier for classification, returning the classified sand back to a second ball mill for regrinding, feeding the classified overflow into a weak magnetic roller for iron removal treatment, and obtaining non-magnetic materials and magnetic materials after iron removal; S3, carrying out gravity separation on the non-magnetic material subjected to iron removal in the step S2 through cloth, treating the magnetic material as iron slag, enabling the heavy mineral produced by the process of feeding the cloth-sliding rough concentrate into a shaking table to be tantalum-niobium-tin concentrate, feeding the cloth-sliding tailings into a next process, and feeding middlings and tailings produced by the process of the shaking table into a first cyclone; S4, feeding the tailing distributing obtained in the step S3 into a first-stage cyclone to obtain underflow and overflow of the first-stage cyclone; Step S5, taking the underflow of the cyclone with the section obtained in the step S4 as a coarse-grain raw material, and feeding the coarse-grain raw material into coarse-grain flotation operation, wherein the flotation operation comprises one-time roughing, two-time scavenging and two-time concentration, and coarse-grain lepidolite concentrate is obtained after the roughing foam product is subjected to concentration, and the scavenging tailings are coarse-grain flotation tailings; S6, feeding the coarse fraction flotation tailings in the step S5 into a 1.5T high-gradient magnetic separation to obtain magnetic substances and non-magnetic substances, wherein the non-magnetic substances are ceramic feldspar products; s7, feeding the overflow of the first-stage cyclone in the step S4 into a first deep cone thickener for concentration to serve as a fine-fraction raw material, and then feeding into a second-stage cyclone for classification to obtain underflow and overflow; Step S8, the underflow of the two-stage cyclone in the step S7 is fed into fine-fraction flotation operation, the flotation operation is subjected to primary roughing, secondary scavenging and secondary concentration, the flotation operation sequentially returns to closed-circuit flotation, fine-fraction lepidolite concentrate is obtained after the roughing foam product is subjected to concentration, and the scavenging tailings are fine-fraction flotation tailings; and S9, combining the coarse-size lepidolite concentrate in the step S5 and the fine-size lepidolite concentrate in the step S8 to jointly serve as a lepidolite concentrate product.
  2. 2. The recycling treatment process for lepidolite ore thickness grading step recovery according to claim 1, wherein in the step S4, the proportion of-0.2 mm particle size of the underflow is more than or equal to 80%, the proportion of-0.038 mm particle size is 14% -16%, the proportion of-0.038 mm particle size of the overflow is more than or equal to 90%, and the overflow yield is 12%.
  3. 3. The recycling treatment process for lepidolite ore thickness grading step recovery according to claim 1, wherein in the step S4, the feeding concentration of a section of cyclone is 12% -25%, the pressure is 0.1-0.13 MPa, and the diameter of a sand depositing nozzle is 28mm.
  4. 4. The recycling treatment process for lepidolite ore thickness grading step recovery according to claim 1, wherein in step S7, -0.038mm fraction of underflow accounts for 65% -70%, -0.026mm fraction accounts for 45% -55%, -0.026mm fraction of overflow accounts for 85% -90%, and overflow yield is about 6%.
  5. 5. The recycling treatment process for lepidolite ore thickness grading step recovery according to claim 1, wherein in the step S7, the feeding concentration of the two-stage cyclone is 5% -16%, the pressure is 0.25-0.30 MPa, and the diameter of a sand depositing nozzle is 22mm.
  6. 6. The recycling treatment process for lepidolite ore thickness grading step recovery according to claim 1, wherein in step S7, the concentration of the concentrated first deep cone thickener is controlled to be 5% -16%.
  7. 7. The recycling treatment process for lepidolite ore thickness grading step recovery according to claim 1 is characterized by further comprising the step S10 of feeding the overflow in the step S7 into a second deep cone thickener, concentrating, then feeding into 3.5-4.0T superconducting magnetic separation for recovery, obtaining magnetic lepidolite ore concentrate and non-magnetic matters through superconducting magnetic separation, and combining the magnetic lepidolite ore concentrate with the fine-fraction lepidolite ore concentrate in the step S8.
  8. 8. The recycling treatment process for lepidolite ore thickness grading step recovery according to claim 7, wherein in step S10, the concentration of the second deep cone thickener after concentration is controlled to be 10% -15%.
  9. 9. The recycling treatment process for lepidolite ore thickness grading step recovery according to claim 7 is characterized by further comprising a step S11 of merging the fine-fraction flotation tailings in the step S8 and the high-gradient non-magnetic matters in the step S10 into a third deep cone thickener, controlling the concentration after concentration to be 12% -25%, and then magnetically separating the mixture in a 1.7T slurry machine to obtain low-grade lepidolite ore concentrate and kaolin.
  10. 10. The recycling treatment process for lepidolite ore thickness grading step recovery according to claim 9 is characterized by further comprising a step S12, wherein middlings and tailings produced in the cradle process in the step S3, coarse fraction flotation and scavenging secondary concentrate in the step S5 and high gradient magnetic substances in the step S6 are combined and fed into a first cyclone for grading, underflow is returned to a second ball mill for regrinding, and overflow is fed into the linear screen in the step S1.

Description

Resource treatment process for grading and gradient recovery of lepidolite ore thickness Technical Field The invention relates to the technical field of mineral separation, in particular to a recycling treatment process for lepidolite ore thickness grading and gradient recovery. Background Lepidolite is one of the important mineral raw materials for extracting lithium resources. However, lepidolite has physical characteristics of cleavage development and high brittleness, and is extremely easy to generate a mud phenomenon due to crushing in the ore grinding process. In the conventional beneficiation process, a hydrocyclone is generally used for desliming pretreatment in the conventional process in order to eliminate negative effects of fine-particle-grade slime on flotation processes, such as increase of reagent consumption, deterioration of froth stability, reduction of concentrate grade, and the like. The traditional process is limited by the bottleneck of a micro-particle grade separation technology, and only the classified settled sand (coarse particle grade) is subjected to flotation, so that the micro-mud overflowed from the cyclone is usually directly discharged as tailings, and a large amount of monomer dissociated lepidolite is lost. Because lepidolite is easy to enrich in fine particle grade in ore grinding, direct discarding of high-grade fine mud leads to low recovery rate of lithium resources and huge waste of resources. On the other hand, if the full-size-fraction mixed flotation is directly carried out without classification, the requirements of coarse-grain and fine-grain minerals on hydrodynamic environment are quite different, for example, fine grains need to be stabilized to prevent entrainment, so that the grade and recovery rate of concentrate are difficult to be simultaneously considered, and the sorting effect is poor. In addition, the mineral composition of the spring-band lepidolite resource in China is complex, the content of fine mud is high, and the conventional flotation separation is difficult and the resource utilization rate is low. The evolution of lepidolite in the region generally shows a variation of 'petalite-lepidolite', and the lepidolite has natural weak magnetism due to the retention of iron elements in crystal lattices. However, the overflow product of the hydrocyclone in the prior art has extremely fine granularity (mainly minus 0.026 mm), large specific surface area and serious mud formation, is difficult to collect by conventional flotation, cannot be effectively separated by conventional magnetic separation (1.0-1.5T) due to insufficient magnetic field force, is generally regarded as waste discharge in industry, and causes the problems of low resource waste and recovery. Disclosure of Invention Aiming at the defects of low recovery rate of lithium resources, high resource waste, difficulty in considering concentrate grade and recovery rate, poor sorting effect and the like in the prior art, the inventor provides a reasonable and effective recycling treatment process for the lepidolite ore coarse-fine grading cascade recovery, can remarkably improve the recovery rate of lepidolite, and obtain various mineral products with high grade value, fully recover minerals, and remarkably improve the comprehensive utilization rate of lithium resources. The technical scheme adopted by the invention is as follows: A recycling treatment process for lepidolite ore thickness grading and gradient recovery comprises the following steps: Step S1, raw ore in a powder ore bin is fed into a linear sieve for sieving, the aperture of the sieve is controlled to be 1mm, and undersize and oversize are respectively obtained after sieving; Step S2, feeding the oversize product obtained in the step S1 into a first ball mill for grinding, feeding the ground ore product and the undersize product obtained in the step S1 into a spiral classifier for classification, returning the classified sand back to a second ball mill for regrinding, feeding the classified overflow into a weak magnetic roller for iron removal treatment, and obtaining non-magnetic materials and magnetic materials after iron removal; S3, carrying out gravity separation on the non-magnetic material subjected to iron removal in the step S2 through cloth, treating the magnetic material as iron slag, enabling the heavy mineral produced by the process of feeding the cloth-sliding rough concentrate into a shaking table to be tantalum-niobium-tin concentrate, feeding the cloth-sliding tailings into a next process, and feeding middlings and tailings produced by the process of the shaking table into a first cyclone; S4, feeding the tailing distributing obtained in the step S3 into a first-stage cyclone to obtain underflow and overflow of the first-stage cyclone; Step S5, taking the underflow of the cyclone with the section obtained in the step S4 as a coarse-grain raw material, and feeding the coarse-grain raw material into coarse-grain