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Smashing and screening are essential

Release time:2019-11-12 From: Zhengnai Industry in China

Cylinder dryer structure

The cylindrical dryer structure is a tiltable, rotatable metal cylinder with different forms of baffles installed to increase the contact time between the material and the heat medium.

Graphite electrode production process

  • 1. Calcination.
  • 2. Broken.
  • 3. The kneading.
  • 4. To shape.
  • 5. Roasting.
  • 6. Maceration.
  • 7.Graphitization.
  • 8. Machining.
  • 9. After inspection, the finished products shall be properly packaged and distributed to users.
 

Cylinder dryer deflector has 3 forms

There are three types according to the flow direction of materials and heat medium: forward flow, counter flow and composite.
 

Conditions for downstream material drying

The flow direction of the downstream drying material is the same as the direction of the heat medium movement. In this way, the temperature difference between the dry material and the medium is small, and the temperature of the material leaving the baking machine is low.

Countercurrent definition and pros and cons

The direction of heat medium movement opposite to the flow direction of the material is called counterflow type. The average temperature difference between the heat medium and the material is larger, and the drying speed is faster, but the temperature of the material leaving the dryer is higher.
 

The use of the composite dryer

The compound dryer is a concentric double-layer cylinder, the material flows in the interlayer, and the heat medium passes in the middle of the cylinder in the downstream direction, indirectly heating the material, then folding back, and directly contacting the material through the interlayer in a countercurrent manner. The dry heat medium is from the calcining chamber, and the hot flue gas provided should be kept within the specified temperature range to avoid oxidation of the material.

Parameter of graphite electrode

Item Unit UHP HP
300-600mm 650-800mm 300-800mm
Electric resistivity Electrode μΩm 4.8-5.8 4.6-5.8 5.8-6.6
Nipple 3.8-4.5 3.8-4.5 4.2-5.0
Flexural strength Electrode Mpa 10.0-14.0 10.0-14.0 10.0-13.0
Nipple 20.0-26.0 22.0-26.0 18.0-22.0
Elastic modulus Electrode Gpa 9.0-13.0 10.0-14.0 8.0-12.0
Nipple 15.0-18.0 15.0-18.0 14.0-16.0
Bulk density Electrode ≥g/cm3 1.68-1.74 1.70-1.74 1.62-1.66
Nipple 1.77-1.82 1.78-1.84 1.74-1.80
CTE(100-600℃) Electrode x10-6/℃ 1.1-1.4 1.1-1.4 1.6-1.9
Nipple 0.9-1.2 0.9-1.2 1.1-1.4
Ash   0.3 0.3 0.3

The drying efficiency of the fluidized dryer is higher

The fluidized dryer is a tilted plate conveyor with a screen hole. The material is fed from above the plate conveyor. The hot air flows from the lower part of the plate conveyor through the sieve hole and passes through the material to fluidize the moving material. Continuously evaporated, the drying efficiency of the fluidized dryer is relatively high.
 

Smashing and screening are essential

The raw materials used in the production of charcoal products (including the production of return materials) must be pulverized into several sizes of aggregates and powders according to the formulation requirements. Therefore, pulverization (including crushing and milling) and sieving are essential processes for the production of carbon products. .

Crushing definition

The process of making the size of a large solid material smaller is called pulverization.

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