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Vol 65, Issue 5, [10 - 2024]

Study on sedimentation of tailings sludge from bauxite processing plant of TKV's Aluminum Companies by lamella thickener

DOI:10.46326/JMES.2024.65(5).03

  • Affiliations:

    1 Hanoi University of Mining and Geology, Hanoi, Vietnam
    2 Vinacomin-Dak Nong Aluminium Company (DNA), Dak Nong, Vietnam

  • *Corresponding:
    This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Received: 15th-Mar-2024
  • Revised: 19th-July-2024
  • Accepted: 15th-Aug-2024
  • Online: 1st-Oct-2024
Pages: 21 - 30
Views: 193
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Abstract:

Inclined parallel plates thickener (lamella sedimentation tank) is a new modern type of equipment for fine slurry deposition in the world. Actual use shows that the tank is very effective with fine and ultra-fine slurry. But up to now, lamella thickeners have hardly been used in the mineral processing industry in Vietnam. Currently, two bauxite ore washing factories (Dak Nong and Lam Dong Aluminum Company) are using 02 traditional thickeners with a total area of 4,400 m2 to sediment slurry with a volume flow of 4,000 m3/h. However, the sedimentation efficiency is low, and the overflow water quality and discharge product concentration have not reached the design criteria. The reason is that the slurry from the two companies' washing factories contains over 60% ultra-fine particles (-0.02 mm) and the ROM ore properties have changed further compared to the design. The report presents the sedimentation results of two slurry samples with particle sizes below 1 mm, which were collected from the bauxite ore washing factory of Dak Nong and Lam Dong Aluminum Company. Tests were conducted using a laboratory Lamella sedimentation tank with a settling surface area of 0.05 m2. The feed capacity to the thickener was 0.52÷0.63 m3/h (3 times higher than the theoretical calculated capacity). The 6% solid concentration of tailing slurry is separated into the overflow product (has a solid concentration in the range of 56.33÷80 mg/l) and the discharge product (with a solid concentration in the range of 35.44÷48.39%). The above preliminary results open the prospect of applying lamella sedimentation tanks to the actual slurry deposition of washing factories of Vinacomin's Aluminum Companies.

How to Cite
Pham, L.Van, Le, H.Viet, Pham, H.Thanh, Nhu, D.Kim Thi, Nguyen, P.Ba and Nguyen, H.Vu 2024. Study on sedimentation of tailings sludge from bauxite processing plant of TKV's Aluminum Companies by lamella thickener. Journal of Mining and Earth Sciences. 65, 5 (Oct, 2024), 21-30. DOI:https://doi.org/10.46326/JMES.2024.65(5).03.
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