Grinding machine selection and calculation (1)

The rod mill has a certain selective crushing effect, the product has uniform particle size, less crushed ore particles, and is suitable for coarse grinding. The product size is 1 to 3 mm.

Ball mills are available in both lattice and overflow types. The lattice ball mill is often used in the first section of the two-stage grinding process, and often forms a closed circuit with the spiral classifier. The upper limit of the product size is 0.2 to 0. .3 mm The overflow ball mill is often used in the second stage or intermediate product grinding in the two-stage grinding process. The product size is generally smaller than 0.2 mm .

The calculation method commonly used in grinding machines is the volumetric method, that is, according to the original or the newly generated calculation level (usually used) -0.074 mm The content of the grain size is calculated by the processing amount of the grinding and the unit volume, and then the processing amount of the grinding machine is calculated.

1 ) Calculation of q value
q=K ₁ K ₂ K3K ₄ q _o (1)

In the middle     q ——The mill to be selected in the design according to the newly generated level ( -0.074mm Granular level) Calculated unit throughput, t / ^m3 · hour;

        q ₀ - The mill used in production is at the newly generated level ( -0) . 074mm Level) Calculated unit throughput, t / ^m3 · hour;

(2)

Q ₀ - the amount of grinding machine used in production, tons / Taiwan · hour;

    β ₁ - less than the grinding machine used in production 0.074mm The content of the level, % ;

    β ₂ - less than the grinding machine used in production 0.074mm The content of the level, % ;

    V - the effective volume of the grinding machine used in production, m ³ ;

    K ₁ —— the grinding difficulty coefficient of the ore to be ground, determined according to experimental data or with reference to Table 1 ;

Table 1 ore grinding difficulty coefficient K ₁

    K ₂ - the diameter of the grinding machine is proportional to the positive coefficient, which can be calculated according to formula 3 :

(3)

  n - variable index . The relationship between the value of n and the diameter and type of the mill can be found in Table 2 ;

    D ₁ - diameter of the grinding machine to be selected in the design, meters;

    D ₂ - diameter of the mill used in production, meters;

    b ₁ —— thickness of the grinding machine liner to be selected in the design, meters;

    b ₂ - thickness of the mill liner used in production, meters;

    K ₃ —— the type correction coefficient of the grinding machine to be selected in the design, check Table 3 ;

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