Abstract
Deep dry screening is the key unit in mineral processing. A vibrating flip-flow screen (VFFS) can provide effective solutions for screening fine-grained minerals, and it has been extensively used in many industrial fields. An accurate dynamic model of VFFS considering the influence of materials is significant for its dynamic analysis and screening process research, but it has rarely been studied in detail. In this paper, an improved dynamic model of VFFS is proposed and its dynamic equations are solved to find the reasonable operating condition, and experiments are carried out to verify the reasonability of the proposed model under no-load and loading materials conditions. Furthermore, the method of multistage sampling and multilayer screening is also applied to evaluate the screening performance of iron ore at 3 mm cut size on VFFS. Results show that when the mass of materials, relative amplitude, and operating frequency have values of 107 kg, about 6 mm and 80.79 rad/s, respectively, the screening efficiency gradually increases with an increase of screening length, reaching 89.05%; however, it does not change much when the screening length exceeds 1900.8 mm. Additionally, the misplaced materials of coarse particles will continue to increase as the screening length increases. This provides theoretical and technical support for the optimization of the length of the VFFS.
Highlights
Screening is a vital unit in mineral processing and utilization [1, 2]
The vibrating flip-flow screen (VFFS) was employed for screening 3 mm iron ore, and an improved dynamic model of VFFS is proposed considering the effects of loading materials and verified by analyzing the vibration data obtained from a vibration test and analysis unit
The dynamic characteristics of VFFS has been studied and analyzed by many scholars; the existing dynamic model of VFFS usually did not consider the influence of materials, and there is a little report on screening experimental research of VFFS
Summary
Screening is a vital unit in mineral processing and utilization [1, 2]. In recent years, the dry deep screening of moist and fine-grained minerals has become increasingly essential in many industries. e dry deep screening technology, which can simplify the cleaning process, has become the technology of choice for power coal preparation plants [3]. Erefore, the vibrating flip-flow screen (VFFS) with elastic sieve mats has been widely used for screening fine-grained minerals due to its good performance [6,7,8,9,10]. Xiong et al [12] analyzed the dynamics of a banana flip-flow screen with linear springs and proposed an analytical model for an elastic sieve mat based on catenary theory. Differing from the VFFS, the Liwell flip-flow screen is driven by a crank and connecting rod, and its dynamic characteristics are stable during screening process. The particle distribution characteristics of various size fractions and screening performance of different sections on VFFS are investigated in the screening process. The particle distribution characteristics of various size fractions and screening performance of different sections on VFFS are investigated in the screening process. is study provides theoretical and technical support for optimally structural design and industrial applications of VFFS
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