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CA-3246254-C - FULL-SIZE SEPARATION AND PRE-ENRICHMENT PROCESS FOR COAL-ASSOCIATED GERMANIUM-BEARING MINERALS

CA3246254CCA 3246254 CCA3246254 CCA 3246254CCA-3246254-C

Abstract

The present disclosure provides a full-size separation and pre-enrichment process for coal-associated germanium-bearing minerals, including the following steps: S1: feed grading preparation; S2: X-ray separation: feeding an oversize material into an X-ray sorting unit (2) for separation; and S3: microbubble flotation: feeding an undersize material into a microbubble flotation unit for separation: S3.1: allowing the undersize material to pass through a crushing mill (7) and a grinding mill (8) successively to allow full cleavage, to obtain a ground product; S3.2: grading the ground product by a hydrocyclone (9), to feed an overflow product of the hydrocyclone into a microbubble flotation separation unit for separation, and return an underflow product of the hydrocyclone to the grinding mill (8) for regrinding; S3.3: feeding the overflow product of the hydrocyclone (9) and an agent into a forced stirring mineralization device (12) for stirring mineralization; S3.4: subjecting a mixture produced after the stirring mineralization to rough selection with a flotation machine (13); and S3.5: subjecting an overflow product of the flotation machine (13) to fine selection with a flotation column (16), such that the coal-associated germanium-bearing minerals are efficiently separated out.

Inventors

  • Xiahui GUI
  • Yonggai LI
  • Tianyuan XU
  • Lei Wang
  • Yaowen XING
  • Qinshan LIU
  • Mengdi XU
  • Yangchao XIA
  • Yijun CAO
  • Zhenyong MIAO
  • LANOAO WANG

Assignees

  • CHINA UNIVERSITY OF MINING AND TECHNOLOGY

Dates

Publication Date
20260505
Application Date
20230306
Priority Date
20220511

Claims (10)

  1. CLAIMS 1. A full-size separation and pre-enrichment process for coal-associated germanium-bearing minerals, characterized by comprising the following steps: S1: feed grading preparation to obtain an oversize material and an undersize material; S2: X-ray sorting: feeding the oversize material into an X-ray separation unit (2) for separation; and S3: microbubble flotation: feeding the undersize material into a microbubble flotation unit for separation: S3.1: allowing the undersize material to pass through a crushing mill (7) and a grinding mill (8) successively to allow full cleavage, to obtain a ground product; S3.2: grading the ground product by a hydrocyclone (9), to feed an overflow product of the hydrocyclone into a microbubble flotation separation unit for separation, and return an underflow product of the hydrocyclone to the grinding mill (8) for regrinding; S3.3: feeding the overflow product of the hydrocyclone (9) and an agent into a forced stirring mineralization device (12) for stirring mineralization; S3.4: subjecting a mixture produced after the stirring mineralization to rough selection with a flotation machine (13); and S3.5: subjecting an overflow product of the flotation machine (13) to fine selection with a flotation column (16).
  2. 2. The process for the full-grain-size-grade sorting and pre-enrichment of the germanium minerals associated with the coal measures according to claim 1, characterized in that the microbubble flotation unit comprises the forced stirring mineralization device (12), the flotation machine (13), and the flotation column (16), the flotation machine (13) is arranged downstream from the forced stirring mineralization device (12), and the flotation column (16) is arranged downstream from the flotation machine (13).
  3. 3. The process for the full-grain-size-grade sorting and pre-enrichment of the germanium minerals associated with the coal measures according to claim 2, characterized in that the microbubble flotation unit further comprises a first concentrate pump (14) and a second tailing pump (18), the first concentrate pump (14) is arranged between the flotation machine (13) and the flotation column (16), and the second tailing pump (18) is connected to an underflow discharge port of the flotation column (16).
  4. 4. The process for the full-grain-size-grade sorting and pre-enrichment of the germanium minerals associated with the coal measures according to claim 3, characterized in that the microbubble flotation unit further comprises the crusher (7), the grinding mill (8), and the hydrocyclone (9), the crushing mill (7) is arranged downstream from a grading screen (1), the12 CPST Doc: 1396-5979-3935 grinding mill (8) is arranged downstream from the crushing mill (7), and the hydrocyclone (9) is arranged downstream from the grinding mill (8).
  5. 5. The process for the full-grain-size-grade sorting and pre-enrichment of the germanium minerals associated with the coal measures according to claim 4, characterized in that the forced stirring mineralization device (12) is arranged downstream from the hydrocyclone (9), and the flotation column (16) communicates with the grinding mill (8) through the second tailing pump (18).
  6. 6. The process for the full-grain-size-grade sorting and pre-enrichment of the germanium minerals associated with the coal measures according to claim 4, characterized in that a feed port of the grinding mill (8) is connected to a feed port of the hydrocyclone (9), and an underflow discharge port of the hydrocyclone (9) is connected to the feed port of the grinding mill (8).
  7. 7. The process for the full-grain-size-grade sorting and pre-enrichment of the germanium minerals associated with the coal measures according to claim 4, characterized in that the microbubble flotation unit further comprises a flotation agent-feeding platform (10), and the flotation dosing platform (10) is arranged downstream from the hydrocyclone (9) and is arranged upstream from the forced stirring mineralization device (12).
  8. 8. The full-size separation and pre-enrichment process for the coal-associated germaniumbearing minerals according to claim 4, characterized in that the grading screen (1) has a pore size of 25 mm.
  9. 9. The full-size separation and pre-enrichment process for the coal-associated germaniumbearing minerals according to any one of claims 4 to 8, characterized in that the crushing mill (7) is a hammer crushing mill.
  10. 10. The full-size separation and pre-enrichment process for the coal-associated germaniumbearing minerals according to any one of claims 4 to 8, characterized in that the grinding mill (8) is a ball grinding mill.

Description

FULL-SIZE SEPARATION AND PRE-ENRICHMENT PROCESS FOR COALASSOCIATED GERMANIUM-BEARING MINERALS TECHNICAL FIELD The present disclosure relates to the technical field of mineral separation, and in particular to a full-size separation and pre-enrichment process for coal-associated germanium-bearing minerals. BACKGROUND Coal is an important primary energy source in China, and coal measures are associated with abundant strategic metal minerals. With the development of emerging industries and the overall layout of national security, it is of great significance to improve the engineering level of coalassociated strategic metal minerals. As a typical representative, coal-associated germaniumbearing minerals have reached an industrially-available grade in the Lincang coalfield of Yunnan province and the Wulantuga coalfield of Inner Mongolia, providing a basis for extraction and utilization. The development of separation and pre-enrichment of coal-associated germanium-bearing minerals is conducive to improving the efficiencies of subsequent activation and leaching processes. However, because the coal-associated germanium-bearing minerals are finely and disorderly dispersed in coal measures and have characteristics such as a low grade and coexistence of coarse and fine grains, the traditional physical separation technologies are not applicable to the coal-associated germanium-bearing minerals, and exhibit an extremely-low separation efficiency for the coal-associated germanium-bearing minerals. Currently, there is yet no technology for efficient full-size separation and pre-enrichment of coal-associated germanium-bearing minerals in China. Based on the idea of phase identification and separation, the physical separation and preenrichment of coal-associated germanium-bearing minerals can be allowed according to occurrence states of germanium minerals in the coal measures and property differences between occurrence phases and non-occurrence phases. The coal-associated germanium-bearing minerals are mainly in a huminite/vitrinite organic component, and both of the occurrence phases are organic components of coal. Therefore, coal-associated germanium-bearing minerals also have the basis for industrial collaborative extraction. Based on the occurrence characteristics and the physical and chemical properties of occurrence phases of the coal-associated strategic germanium metal, it is urgent to develop an efficient full-size separation and pre-enrichment process and system for coal-associated germanium-bearing minerals based on phase identification, to promote the extraction and utilization of coal-associated germanium-bearing minerals and effectively2 CPST Doc: 1396-5979-3935 ensure the safety of national resources. SUMMARY In view of the above analysis, an embodiment of the present disclosure is intended to provide a full-size separation and pre-enrichment process for coal-associated germanium-bearing minerals, to solve the problem that the existing process has a low separation efficiency for coal-associated germanium-bearing minerals. The present disclosure provides a full-size separation and pre-enrichment process for coalassociated germanium-bearing minerals, including the following steps: S1: feed grading preparation to obtain an oversize material and an undersize material; S2: X-ray sorting: feeding the oversize material into an X-ray separation unit for separation; and S3: microbubble flotation: feeding the undersize material into a microbubble flotation unit for separation: S3.1: allowing the undersize material to pass through a crushing mill and a grinding mill successively to allow full cleavage, to obtain a ground product; S3.2: grading the ground product by a hydrocyclone, to feed an overflow product of the hydrocyclone into a microbubble flotation separation unit for separation, and return an underflow product of the hydrocyclone to the grinding mill for regrinding; S3.3: feeding the overflow product of the hydrocyclone and an agent into a forced stirring mineralization device for stirring mineralization; S3.4: subjecting a mixture produced after the stirring mineralization to rough selection with a flotation machine; and S3.5: subjecting an overflow product of the flotation machine to fine selection with a flotation column. Further, the microbubble flotation unit includes the forced stirring mineralization device, the flotation machine, and the flotation column, the flotation machine is arranged downstream from the forced stirring mineralization device, and the flotation column is arranged downstream from the flotation machine. Further, the microbubble flotation unit further includes a first concentrate pump and a second tailing pump, the first concentrate pump is arranged between the flotation machine and the flotation column, and the second tailing pump is connected to an underflow discharge port of the flotation column. Further, the microbubble flotation unit further includes the crushing mill, the grinding