WANG Xuexia;YU Mei;WANG Yemin;MA Chao;BU Xiangning;

• 1:Department of Mining Engineering
• 2: Shanxi Institute of Technology
• 3:Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education)
• 4:China University of Mining & Technology

Abstract：

The main bottleneck restricting the efficient flotation recovery of fine coal slime is the low mineralization efficiency of particles and bubbles caused by the properties of fine coal slime itself, but the influence of factors such as clay mineral entrainment pollution, foam properties, and collector performance cannot be ignored. To understand the latest research progress on methods and technologies for enhancing flotation separation of fine coal slime, firstly, the reasons for the difficulty in flotation separation of fine coal slime were introduced. Secondly, seven aspects including increasing apparent particle size, reducing bubble size, strengthening flow field regulation, optimizing collector performance, improving flotation equipment, innovating flotation processes, and pretreating slurry were reviewed comprehensively. Finally, the advantages and disadvantages of different enhancing methods and technologies of flotation separation were also deeply explored. To overcome the impact of the small mass of fine coal slime, flocculation flotation is a common technique to increase the apparent particle size of particles. Its flotation enhancement performance is significant, while the selectivity and cost of reagents need to be considered. Both carrier flotation and ultrasonic standing-wave agglomeration have good potential, but they are currently in the laboratory research stage. Reducing the bubble size is an effective means to improve the collision probability between particles and bubbles. The nanobubble flotation technology can significantly improve the recovery rate of fine coal slime and effectively reduce the dosage of reagents. The probability of collision and adhesion between particles and bubbles can also be improved by strengthening the flow field regulation. Turbulence enhancement can effectively promote the improvement of flotation index. The optimization of collectors is aimed at reducing the cost of reagents and improving the selectivity of reagents. The main research points include improving the dispersibility of traditional reagents, introducing polar groups, and designing new types of reagents. The technologies of reagent emulsification, collector substitutes, compound collectors, and new nanoparticle collectors have all shown good strengthening effects in varying degrees. However, their preparation costs and possible environmental impacts are urgent problems that need to be addressed. In addition, for the challenge of fine coal slime separation, the core breakthrough point of flotation equipment optimization is the efficient mineralization of target minerals and the effective suppression of gangue minerals. Multiple flotation and classification flotation are the important technological innovations to solve the problem of incomplete separation of fine coal slime. Pretreatment intensification technologies such as slurry classified conditioning, ultrasonic and high shear effectively improve the uniformity of reagents and slurry, as well as the collision probability between reagents and coal particles, thereby enhancing the flotation separation performance. Among the different enhancing methods and technologies of flotation separation mentioned above, flocculation flotation, ultrasonic standing-wave agglomeration, nanobubble flotation, turbulence intensity regulation, and collector molecular design optimization are all in the laboratory research stage. A large amount of basic theoretical research and semi-industrial research are needed to develop towards industrial application. At present, it is more appropriate and feasible for coal preparation plants to enhance the flotation separation performance of fine coal slime by seeking new cost-effective reagents, upgrading flotation equipment, innovating flotation process, and finely strengthening flotation slurry pretreatment.

Key Words： fine coal slime;flotation enhancement;increase apparent particle size;reduce bubble size;strengthen flow field;collector optimization;equipment and process improvement

Abstract:

Keywords:

Foundation: 国家自然科学基金资助项目(52204296);; 山西省基础研究计划(自由探索类)青年资助项目(202303021212311);; 山西省高等学校大学生创新创业训练计划资助项目(202314527004)

Authors: WANG Xuexia;YU Mei;WANG Yemin;MA Chao;BU Xiangning;

DOI: 10.13226/j.issn.1006-6772.24053101

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