How to judge the difficulty of re-election of two minerals?

Re-election is based on the mineral density of the mineral separation, re-election must be carried out in the medium. Therefore, the density of minerals and the density of the medium are the most important factors affecting the re-election process. The difficulty of re-sorting two minerals can be roughly judged by the following formula:

In the formula, Î´ ₁ , Î´ ₂ , Ïâ€” the density of light minerals, heavy minerals and medium, respectively.

E is called the reselection criterion for judging. The larger the E value, the easier it is to separate. It is customary to divide the E value into several levels as shown in Table 25 .

Table 25 judges the difficulty of re-election separation based on E value

E value

E>2.5

2.5>E>1.75

1.75>E>1.5

1.5>E>1.25

E<1.25

Reselection separation

Degree of difficulty

Extremely easy

easy

medium

difficult

Extremely difficult

To separate the metal and non-metallic minerals, for example, is generally greater than the density of metallic minerals 4.6g /cm ³ , the density of non-metallic minerals is generally less than 2.8 g /cm ³ when in the water medium (Ï= 1.0 g When separating them in /cm ³ ) , then:

It is easy to separate.

It can be seen from the above formula that for two specific minerals, that is, Î´ ₂ and Î´ _{1 are} constant, the larger the density Ï of the medium, the larger the E value, and the easier the separation becomes. For example, when Ï= 1.8 g /cm ³ , separating metal and non-metallic minerals, then

Separation is extremely easy at this time.

Of course, the particle size, shape, and motion state of the mineral particles are also important factors in the re-election process. Therefore, it is only preliminary and rough to judge the difficulty of re-separation by using the E value as the criterion.

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