January 21, 2022

Reselection theory


In recent years, domestic and foreign scientific and technological workers have carried out a lot of research on improving the precision of re-election equipment sorting, increasing processing capacity and the joint use of re-election and other processes. The purpose is to use the re-election process to strengthen complex and difficult selection. The recovery of fine-grained high-density minerals improves the quality of concentrates. The research on shaker and centrifugal beneficiation (flow film dressing) is a hot spot in the field of re-election. It is the main research content to strengthen the recovery of high-density minerals in fine-grained grade and improve the sorting accuracy in the process of re-election.

1 Shaker design and simulation

In view of the low efficiency and large floor area of ​​single-layer traditional shaker re-election, Guo Nianqin and others used Solidworks three-dimensional mechanical design software to design a three-layer suspension shaker, and used ADAMS software to carry out dynamic simulation analysis. The analysis of the speed and acceleration of the shaker under different strokes and strokes is carried out, and the relationship between the motion parameters of the shaker and the weight is obtained.
Wu Zhu et al. used Solidwords software to carry out three-dimensional modeling and optimization design of the LYN(S)-1100×500 shaker, and used Mastercam software to design the key component—the bed surface for NC machining, and carried out on the Nantong V1100B machining center. CNC machining, optimized new products have been used by many mineral processing research institutes across the country, with good results.
2 Study on the dynamics and separation mechanism of centrifugal concentrator Liu Weishi et al. Based on the basic equations of fluid dynamics and single fluid model, the slurry film in the vertical centrifugal concentrator sorting cone is in radial, tangential and axial directions. The dynamics analysis is carried out, and the calculation models of the fluidized bed in radial, tangential and axial directions are established by certain simplifying assumptions and theoretical calculations. Wen Xuefeng et al. used the Falcon SB centrifugal sorting machine as an example to establish the kinetic equation of spherical particles in the stratified zone and sorting zone of the centrifugal separator.

3 Study on stratification and movement mechanism of jig

Wei Guofeng et al. used the theory of potential energy theory and other layers to analyze the effect of bed looseness on the sorting effect of the moving sieve jig through the layered analysis test of the moving sieve jigging machine. Han Huijun et al. used the analytical method to study the kinematics of the sieve of the mechanical sieve jig, and used Matlab to solve the motion equation of the sieve of the mechanical sieve jig. Wang Xingyu et al. used the 3D modeling software Pro/Engineer to model the GDT series mechanical sieve jigs in three dimensions, and analyzed the kinematics with ABAQUS software. Yang et al., Respectively, using a particle size distribution and density to give the volume fraction of coal particles of different particle size and density combinations. Wei Shuhai et al. proposed and demonstrated that the generalized buoyancy is the fundamental driving force and theoretical basis of jigging stratification based on the comprehensive force analysis of solid particles in liquid. On the model jigging experiment system, Yan Yali and others used high-speed cameras and dynamic analysis software to capture the particle motion image of the jigging process at a rate of 100 frames per second. Two density and two particle size particles were studied in more than 60 groups. Under the experimental conditions of the motion process, multiple sets of particle motion curves were obtained.

4 Progress in foreign re-election theory

D. Boucher et al. studied the particle motion of the laboratory spiral chute during the gravity sorting process, using PEPT (Positron Emission Particle Tracking) particle tracking technology for different particle sizes and The trajectory of the density tracer particles is tracked. By recording the trajectory of the particles and their corresponding time, the distribution and velocity of the different particle size and density tracer particles are determined. The PEPT technique shows a powerful research on the particle motion visualization. Functional and developmental potential to provide data in gravity ore dressing studies to visualize particle motion

Stephen Viduka et al. combined the CFD and DEM techniques to simulate and simulate the fluid motion and particle distribution in the jigging process, and describe and analyze the trajectories of particles of different density and size during the jigging process. In order to improve the separation efficiency of different plastic particles, Kunihiro Hori et al. conducted a sorting test on a jig. The results show that the flow rate of the pulsating water flow is the main factor affecting the sorting efficiency. Tetsuya Yamamoto et al. studied the particle grading behavior in a vertical centrifuge and simulated the fluid behavior. C. Raghu Kumar et al. investigated the effects of rising water flow rate, feed rate and slurry density on the sorting efficiency of fine-grain coal grader. The mathematical data were used to analyze the test data and the classification efficiency of the equipment was carried out. Evaluation. In order to solve the problem that the Falcon centrifuge industrial sorting index is difficult to predict, Jean-sébastien Kroll-Rabotin et al. proposed a robust control model by introducing a continuous polynomial equation, which can predict the industrial sorting index of Falcon centrifuge. Xuesong Wang et al. constructed and simulated the flow field distribution of the fluidized bed centrifugal sorter under different centrifugal force and flushing water speeds. The obtained results were consistent with the actual measured results of the flow field. MADoheim et al. used Euler's equation and turbulence model to simulate the velocity, distribution rate and sorting effect of the spiral chute during the sorting process, and compared the predicted data with the experimental results. The research shows that the RNG K-ε turbulence The model simulation results are in good agreement with the experimental data. KPGalvin et al. constructed a centrifugal force sloping plate model to investigate the movement and separation of particles under different centrifugal forces and inclined plates. RDPascoe et al. based on QEMSCAN technology to improve the understanding of re-election efficiency, QEMSCAN technology can analyze and calculate mineralogy, mineral composition, particle size and dissociation of raw ore and mineral processing products, the research results show that this technology is available Predict the efficiency of re-election. Gajanan Kapure, who used for sorting behavior of iron ore in the fluidized bed density of chromium sorter (floatex density separator) slip velocity model simulation studies, only about 5% of the error model predictions and experimental results from It can be seen that the slip velocity model can be used for sorting behavior research and sorting performance prediction in the re-election process.

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