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Dry beneficiation and cleaning of chinese high-ash coarse coal utilizing a dense-medium gas-solid fluidized bed separator

He J., Tan M., Zhu R., Luo Z.

Physicochemical Problems of Mineral Processing

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2016

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Vol. 52, iss. 2

662--675

EN

Dry dense-medium fluidized bed separation provides a new alternative approach for coal beneficiation and cleaning. An indicator of segregation degree Sash was proposed to evaluate the stratified performance of coal samples by bed density. Fluidization stability of the bed was greatly enhanced by mixing a certain amount (21.53%) of fine magnetite powder (< 0.15 mm) into the fluidized media, which indicated a uniform density distribution as well as slight fluctuations in bed. It was found that the favorable density-segregation performance of 3–13 mm coarse coal occurred with a static bed height of 80 mm and a superficial gas velocity of 11.84 cm/s. The optimal segregation degree values of 0.67, 0.74 and 0.76 were obtained for 3–6, 6–10 and 10–13 mm coal samples, respectively. Low-ash clean coal with yields of 50.79, 56.83 and 61.24% were effectively acquired by the dry separation for various coal size fractions, respectively. Probable error values of 0.07, 0.055 and 0.05 g/cm3 were achieved, indicating good separation performance.

2

Numerical investigation of the inner flow in a centrifugal pump at the shut-off condition

Liu H., Wu X, Tan M.

Journal of Theoretical and Applied Mechanics

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2013

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Vol. 51 nr 3

649--660

EN

The unsteady flow fields in a centrifugal pump at the shut-off condition (SOC) are simulated by the Unsteady Reynolds Averaged Navier-Stokes (URANS) approach. To improve simulation accuracy and assign the boundary condition, special 3D models are made. Three-dimensional URANS equations are solved on high-quality unstructured grids with the shear stress transport turbulence model by using the computational fluid dynamics (CFD) code CFX-11.0. Furthermore, the numerical simulation results are validated by particle image velocimetry (PIV) measurements. The main goal of the study is, on one hand, the validation of the numerical procedure proposed, and on the other hand, the detailed analysis of the unsteady inner flow field distribution and pressure fluctuation in the centrifugal pump at SOC. In addition, the head of the pump at SOC is predicted based on CFD results. The flow analysis indicates that there exists two eddies in each impeller flow passage, and the velocity at the volute diffusion part is very low. The amplitudes of pressure fluctuation at ƒr (impeller rotation frequency) and 3ƒr dominate in the impeller, while the pressure fluctuation at ƒb (blade passing frequency) is dominant in the volute.

3

Synthesis and Crystal Structure of a New Mononuclear Silver(I) Complex with a Schiff Base Ligand Derived from 2-Fluorobenzaldehyde and Ethylenediamine

Qu Y., Liu Z., Zhu H., Tan M.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 9

1535-1538

4

Studies on the Controllable Luminescence Properties from Red to Green of Rare Earth Complexes

Cai ZH., Tang Y., Tan M.

Polish Journal of Chemistry

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2004

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Vol. 78 / nr 3

447-449

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Synthesis, Spectral Properties and Antitumor Activity of Some Transition Metal Complexes with a Schiff Base Ligand

Tai X., Yin X., Tan M.

Polish Journal of Chemistry

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2003

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Vol. 77 / nr 4

411-414

EN

Four complexes of transition metals, namely: [Mn(L)2] (complex 1), [Ni(L)2ź0.5H2O] (complex 2), [Cu(L)2ź4H2O] (complex 3) and [Zn(L)2ź0.5H2O] (complex 4), (L = Schiff base derived from trimethylol amino methane and salicylic aldehyde), have been synthesized. The complexes were characterized by elemental analysis, IR, 1H NMR, UV and TG-DTA spectra. Tentative structures for the complexes have been proposed. The antitumor activity against HL-60 human leukemia cells of free ligand and its Mn, Ni, Cu complexes were studied by MTT method.

6

Synthesis of Eu(III) and Tb(III) Complexes with Two New Aryl Amide Type Tetrapodal Ligands and Their Luminescence Properties

Cai ZH., Tang Y., Zhang J., Liu D., Yu Q., Yin X., Tan M.

Polish Journal of Chemistry

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2003

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Vol. 77 / nr 4

471-474