Re-election is suitable for processing useful mineral and has a bigger density difference between the gangue minerals or other materials. It deals with thick bead, and fine grain in grain boundaries (roughly) is greater than 25 mm, 25 '2 mm, 2 ~ o. 1 millimeter) of the ore effective methods. In dealing with subtle exploratory experiment (less than 0.1 mm) the efficiency is not high, the modern flow film processing equipment effective recovery grain to 20-30 level can micron, centrifugal machine can to 10 microns dressing.
Re-election method is deal with tungsten, tin, gold ore, especially ShaJin processing, the traditional method of tin ore. In treating of rare metal (nb and ta, titanium, zirconium, etc.) used in the placers is also common. Re-election is also used to sorting weak magnetic iron ore, manganese ore stone, chromium minerals.

In the coal cleaning industry re-election is the main method. Nonmetallic mineral processing industry in recent years in re-election also obtained the development, mainly used for processing the asbestos, diamond, kaolin, apatite, pyrite mine ore, etc. Choose in copper, lead, zinc, antimony sulfide ore, mercury and other flotation factory. Often the re-election of primary minerals. In the process of mating re-election often and other beneficiation process up the process to (early in the thick bead state elected concentrate or tailings. Heavy this will help reduce the production cost and reduce metal loss. When dealing with some ore have many kinds of methods to choose from, re-election method is preferred.

Re-election in certain fluid to medium, medium used normally water, also sometimes with air or heavy medium (heavy liquid or heavy suspension). Medium sorting equipment to be in the way of the sport. By the buoyancy of medium mineral grains and fluid dynamic function and loose, and then reach by density (sometimes according to size) sent stratification. Effects of the process of nature of layered ore is its density, grain size and the shape of the minor factors.

According to media forms of exercise and the object, the heavy choose has the following several process method:

(1) hierarchical

(2) heavy medium dressing

3) jig dressing

(4) wave bed dressing

(5) chute dressing

(6) spiral dressing

(7) the centrifugal force dressing

(8) wind dressing

(9) wash ore

The essence of the re-election epitomizes loose-layered-the separation process. In sorting equipment within the medium ore layer (called bed layer), in the fluid buoyancy, power or other mechanical force the push of loose, the purpose is to make different density (or particle size) particle generation layered turn a move, it is to achieve re-election by density stratification. So fluid loose role must obey grain group of layered this one requirement. That's re-election and the other two phase flow engineering phase differences from. Fluid of loose different ways, layered result also affected. Re-election theory research rhyme problem, is simply discusses the relationship between the loose and stratification. Layered ore after repeatedly in the mechanical effect respectively under discharge. The sorting is implemented. We can think loose is conditions, stratification is the goal, and separation is the result. The various re-election process method, is to achieve. This process means. They work by such a dominant some fundamental principles;

(1) particles and the settlement of particle group theory,

(2) particle group density stratified according to the theory,

(3) particle group in the sorting cant flow theory.

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