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The role of paraffin

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

Paraffin wax

Paraffin wax is a product after petroleum processing. It is made from the waxy fraction of natural petroleum or artificial petroleum by cold pressing or solvent dewaxing, sweating and the like.


 

Paraffin form

Paraffin wax is an odorless, odorless white or light yellow solid. Paraffin does not react with concentrated acid or concentrated alkali.
 

The role of paraffin

Paraffin wax can also be used to reduce the viscosity of the asphalt during kneading and improve the plasticity of the carbon paste.
 

Use of paraffin

The main use of paraffin is to manufacture higher fatty acids, higher alcohols, matches, candles, water repellents, ointments, insulating materials, and the like.
 

 

Result of adding Fe2O3 powder

After adding iron oxide powder to the formulation, the analysis results of the finished graphite electrode: the graphitization performance of the pitch coke is not as good as that of petroleum coke.
 

Method for improving the degree of graphitization of pitch coke

Iron oxide powder was added when the electrode was produced by using pitch coke as a raw material. The comparative analysis of the sample after graphitization showed a slight increase in the true density; while the resistivity decreased, indicating that the degree of graphitization was improved.

Item Unit UHP
300-500mm 550-600mm 700-800mm
Electric resistivity Electrode μΩm 4.6-6.2 4.5-6.0 4.5-5.8
Nipple 3.5-5.0 3.4-4.5 3.3-4.3
Bending strength Electrode Mpa ≥10.5 ≥10.0 ≥10.0
Nipple ≥20.0 ≥22.0 ≥23.0
Elastic modulus Electrode Gpa ≤14.0 ≤14.0 ≤14.0
Nipple ≤20.0 ≤22.0 ≤22.0
Bulk density Electrode g/cm3 1.66-1.73 1.68-1.74
Nipple 1.75-1.82 1.78-1.85
CTE(100-600℃) Electrode 10-6/℃ 1.20-1.50 1.10-1.50
Nipple 1.10-1.40 1.00-1.30
Ash % ≤0.3

 

Reasons for the adverse processing of adding Fe2O3

Due to the high melting point of iron, it is not easy to volatilize, the residual ash is more, and the hardness of the product is increased, so the machining of the finished product has certain difficulties.
 

Ways to suppress inflation

Using petroleum coke with a very low sulfur content, about 1% of iron oxide is added to the formulation, the main purpose is to suppress the swelling during the graphitization process.
 

Fe2O3 is an additive

The production of graphite electrodes mainly uses ferric oxide as an additive. Ferric oxide is a reddish brown or black amorphous powder that is insoluble in water but soluble in acid.


 

Fe2O3 form and use

Reddish brown powder of ferric oxide is a low-grade pigment, industrially known as iron oxide red, mainly used in paints, inks, rubber and other industries, as well as catalysts or polishing agents for glass, gemstones and metals.
 
The main use of paraffin is to manufacture higher fatty acids, higher alcohols, matches, candles, water repellents, ointments, insulating materials, and the like.
 
 
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