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Classification and use of asphalt

Release time:2019-11-01 From: Zhengnai Industry in China

Definition and use of coal tar pitch

Coal tar is the solid or semi-solid product left after the distillation of coal tar. It is one of the main products of coal chemical industry. Coal tar is widely used in various industries.


 

4 different softening points of asphalt

  • Low temperature asphalt “soft asphalt”, the softening point of the ring and ball method is 35-75 ° C;
  • Medium temperature asphalt, the softening point of the ring and ball method is 75-95 ° C;
  • High temperature asphalt (hard asphalt), the ring and ball softening point is 95-120 ° C;
  • High quality asphalt.

2 uses of low temperature asphalt

Low-temperature asphalt is mainly used as road building materials, processing waterproof linoleum paper, waterproof coating for construction, asphalt paint for production, and sealing material for dry batteries.
The raw material for producing pitch coke can be used as raw material for producing bituminous carbon fiber after special treatment.
Use of medium temperature asphalt
The medium temperature asphalt is mainly used as a binder and impregnating agent for producing carbon products, such as a graphite electrode, a carbon block for an umbrella furnace, a carbon anode or an anode paste for electrolytic aluminum, and an electrode paste required for smelting iron alloy and calcium carbide.

Parameter of UHP graphite electrode

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

Use of high temperature asphalt

High-temperature asphalt can be used as a raw material for producing pitch coke or activated carbon.
The mud cannon material that blocks the iron mouth of the blast furnace often uses high temperature asphalt with a softening point of 135 ° C or higher as a binder.
 

The shape and origin of coal tar pitch

The coal tar is derived from coal tar, which is a black viscous liquid obtained during the carbonization of coal. The density at 20 ° C is 1.15 to 1.20 g/cm3 .

 

Two ways of distillation of coal tar

The coking plant divides the coal tar into various fractions by a boiling method according to the boiling point range. There are two types of coal tar distillation methods: batch type and continuous type.
 

Advantages and disadvantages of batch distillation

The utility model has the advantages that the batch type (the equipment is a distillation still) processes the coal tar, the equipment is simple, the investment required is small, the production flexibility is large, and the disadvantage is that the production capacity is small and the quality is unstable.


 

Reasons for continuous processing for large coking plants

Coal tar continuous processing equipment (equipment including tube heating furnace, evaporator and distillation tower) has large production capacity and stable operation, and is suitable for large coking plants.
 

Method for studying asphalt components

Solvent extraction is the primary method for studying asphalt components, and the results obtained using different solvents are different.
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