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2 Physicochemical Problems of Mineral Processing

2 2023

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Study on the cleanliness of super clean coal prepared by water-only cyclone

Liu Peikun, Wang Hui, Jiang Lanyue, Zhang Yuekan, Yang Xinghua, Li Xiaoyu, Li Feng

Physicochemical Problems of Mineral Processing

2023

Vol. 59, iss. 3

art. no. 168129

Maintaining clean and pristine nature is the key to the use of super clean coal (SCC) for coal-based materials or energy combustion. Herein, SCC is prepared by a new water-only cyclone method, and compared the surface characteristics with the SCC products obtained by conventional chemical deashing method. The results indicate that: FTIR analysis revealed that the chemical method changed the original functional group of coal; BET analysis revealed that the SCC products prepared by the water-only method maintained the micropore volume of the raw coal and yielded a uniform and concentrated distribution of pore sizes, however, the chemical method destroying the original pore structure in the coal; SEM-EDS analysis indicated that the surface of SCC particles that were deashed using the water-only cyclone method was smooth and neat, whereas those obtained using the chemical method were seriously corroded, had a rough surface, and the SCC particles were prone to acid residues and precipitates. This study opens an innovative, simple, and clean method for the preparation of SCC, which further expands and enhances the potential application value of SCC.

Effect of spiral vanes width on the separation performance of a hydrocyclone

Liu Peikun, Wang Xiaoguo, Jiang Lanyue, Zhang Yuekan, Yang Xinghua, Li Xiaoyu, Wang Hui

Physicochemical Problems of Mineral Processing

2023

Vol. 59, iss. 6

art. no. 173563

Aiming at the problem of “entrainment fine particles in underflow” of hydrocyclone in grinding and classification process, a hydrocyclone with spiral vanes (the SV hydrocyclone) was proposed. The CFD techniques were used to study the pressure field, velocity field, turbulence field, particle field and classification efficiency of hydrocyclones with spiral vanes of different widths. The results show that the pressure drop, axial velocity, tangential velocity, turbulence intensity of SV hydrocyclone are reduced in different degrees compared with conventional hydrocyclone, and the reduction becomes more obvious with the increase of vane width. In the case of a vane width of 0.04D, the underflow recovery rate of 5μm and 10μm fine particles was reduced by 16.2% and 15.7%. The selection of spiral vanes with small widths is beneficial to improve the separation accuracy of fine particles and reduce the cut particle size.