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2 Physicochemical Problems of Mineral Processing

2 2024

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Role of maceral groups in coal beneficiation : A short review

Ping An, Liu Xinran, Xia Wencheng, Peng Yaoli, Xie Guangyuan

Physicochemical Problems of Mineral Processing

2024

Vol. 60, iss. 1

art. no. 183765

Macerals are the basic constituents of coal that can be distinguished and identified under the microscope. Depending on the difference in optical properties, the macerals are divided into four maceral groups, including liptinite, vitrinite, huminite and inertinite. These maceral groups not only affect coal mining and utilization but also play different roles in coal beneficiation. According to the different properties of maceral groups, they can be separated (or enriched) to provide high-quality raw materials for the coal industry. This review briefly introduces the international maceral classification system and reviews in detail the role of maceral groups in coal beneficiation combined with their properties.

Analysis of bubble parameters in a fluidized flotation column with steel ball particles

Shi Yingxiang, Wei Zhongkuan, Xu Huilin, Wu Fan, Gao Hang, Ping An

Physicochemical Problems of Mineral Processing

2024

Vol. 60, iss. 6

art. no. 195880

Examining the properties of bubble parameters within a three-phase system is crucial for enhancing and optimizing fluidized bed flotation column cells. This research focuses on the variations in primary bubble parameters within such columns, with the goal of offering a theoretical foundation for the advancement of fluidized bed flotation technology. The experiment utilized steel balls, tap water, and compressed air as the solid, liquid, and gas phases, respectively. Bubble parameters were measured directly using an electrical conductivity probe. Key factors influencing bubble size in the fluidized bed flotation column included the initial static bed height(H*), superficial liquid velocity (UL), superficial gas velocity (UG), and reagent concentration. The study assessed how bubble size and gas holdup are distributed in the fluidization zone and identified how bubble parameters vary with different operating conditions. Findings show that incorporating steel ball particles in the fluidization zone significantly improves bubble stability, reduces the variability of bubble size, and ensures a more consistent bubble distribution. Proper selection of filling particles and accurate bed height adjustment can notably enhance the local gas holdup within the bed. Additionally, it has been found that local gas holdup increases rapidly when the liquid-to-gas velocity ratio drops below a certain threshold.