The essence of re-election is summarized as a loose-layered-separation process. The layer of loose ore (called the bed) placed in the sorting device is loosened by the buoyancy, power or other mechanical forces of the fluid, in order to stratify the different density (or particle size) particles. Re-election is to achieve stratification by density. Therefore, the loose action of the fluid must obey the requirement of stratification of the particles. This is the difference between re-election and other two-phase flow engineering. The looseness of the fluid is different and the stratification results are also affected. The rhyme problem of re-election theory is simply to explore the relationship between looseness and stratification. The stratified ore is discharged separately under mechanical action. That is, sorting is achieved. Therefore, looseness is a condition, stratification is the purpose, and separation is the result. The various re-selection processes described above are implemented. The means of this process. Their work is governed by such basic principles; (1) the theory of sedimentation of particles and particle groups, (2) the theory of stratification of particle groups by density, and (3) the separation theory of particle groups in slant flow. There is also a sorting in the swirling flow, although the medium moves differently. However, the basic law of action is the same except for the difference between gravity and centrifugal force. According to the theory of density stratification, the earliest research is based on the jigging process. A lot of jigging stratification theory has been proposed, and later some special theory of vertical stratification: middle stratification. The bevel flow beneficiation is the first to treat coarser ore in a thick water layer. The sorting is based on the difference in velocity of the particles along the trough. After the 1940s, the bevel flow beneficiation developed towards the film-mining process, mainly for sorting fine-grained and fine-grained grade ore. The flow state has a laminar flow and a turbulent flow. It has been consistently believed that the turbulent pulsation velocity is the basic force of the loose bed, which is difficult to explain under laminar flow conditions. 1954 R. A. The inter-layer shear repulsion mechanics proposed by Bagn0ld complements this interesting gap. However, as with stratification theory, it is still difficult to make reliable calculations based on existing theory. Although re-election theory has not yet reached perfection today, like many process disciplines, it has provided basic guidance for production and can serve as the basis for mathematical statistics and similarity and simulation studies.
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