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Information on graphite particle sieving

Release time:2019-11-13 From: Zhengnai Industry in China

Definition of graphite electrode purity

Purity is the percentage of the aggregate in the aggregate or powder of a nominal size that actually meets the size requirements.

 

Definition of granular purity

Granular purity is a work indicator for managing crushing and milling operations in a carbon plant, and is related to the calculation of working recipes.
 

Screening the actual particle size

After crushing and sieving, the raw materials such as petroleum coke can obtain several aggregates of the same size as the mesh size, but the actual aggregate particles are not completely identical in particle size, but are different in size within a certain size range. a mixture of particles.

Screening operation has four factors

  • 1. The size of the screen inclination angle,
  • 2. The length of the screening time,
  • 3. The size of the sieve hole is not standard,
  • 4. The screen may have partial damage.
 

1 measure to stabilize the quality of ingredients

Regularly measuring the granular purity of the fine powder discharged from the mill and adjusting the operation of the mill in time is an important measure to stabilize the quality of the ingredients.
The manufacturing process of graphite electrodes is our strength.

4 screening equipment

  • Screening equipment includes vibrating screens,
  • simple screens,
  • probability screens and four-layer ladders.
  • China's carbon plants use more vibrating screens.


5 advantages of the vibrating screen

1. The vibrating screen has high production efficiency and high efficiency. 2. It is difficult to operate and maintain. 3. The granular material is not easy to block the sieve hole on the sieve surface. 4. The screen is easy to replace the network. 5. The power consumption is less.
 

The vibrating screen structure is divided into 3 categories.

The vibrating screen structure can be divided into three types: self-centering vibrating screen, motor vibrating screen and inertial vibrating screen, each with advantages and disadvantages.

Size of graphite electrode

Item Unit RP HP
300-500mm 550-800mm 300-500mm 550-700mm
Electric resistivity Electrode μΩm 7.5-8.6 7.5-8.8 5.5-6.8 5.5-7.0
Nipple 4.5-6.0 4.0-5.5
Bending strength Electrode Mpa ≥7.5 ≥6.5 ≥10.0 ≥8.5
Nipple ≥16.0 ≥18.0
Elastic modulus Electrode Gpa ≤9.0 ≤13.0
Nipple ≤13.0 ≤15.0
Bulk density Electrode g/cm3 1.54-1.62 1.62-1.70
Nipple 1.70-1.78 1.72-1.80
CTE(100-600℃) Electrode 10-6/℃ 2.20-2.60 1.80-2.20
Nipple 1.50-1.90 1.50-1.80
Ash % ≤0.3 ≤0.3
 
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