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Introduction materials of graphite electrode

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

Definition of coke volatiles

The volatile matter of coke indicates the distillation temperature of coke and the degree of heat uniformity at high temperatures.


 

Different volatilization levels lead to different coke appearances

The coke with sufficient coke has a silver-gray appearance, and the metal is sounded by tapping. The volatile matter is generally only about 1%. The volatile content is higher, the appearance of coke is dark black, and the sound is dumb when struck.
 

Coke reactivity

The reactivity of coke is related to the coke bulk, pore structure, specific surface and ash composition. The alkali metal oxide in the ash reacts with the reaction of CO2, while SiO2 and Al3O2 act as inhibitors.
 

Anti-alkaline of coke

Alkali resistance is the ability to resist the chemical reaction between alkali metals and their salts and coke. Alkali metals and their salts invade the pores of coke under certain conditions, causing the coke structure to become loose and crack or agglomerate. The service life of blast furnace carbon blocks with metallurgical coke as raw material has a significant impact.


 

Mechanical strength of metallurgical coke

The mechanical strength of metallurgical coke includes two indexes of crushing strength and grinding strength. The two are mutually causal. The mechanical strength of coke directly affects the normal operation of blast furnace smelting.
 

The origin of quartz sand

Silica is an ore with SiO2 as its main component. It is generally called quartz sand after crushing. The silica is pure white and easily broken into small particles. The graphite furnace insulation material in the carbon industry generally uses small particles of quartz sand and coke powder in a certain proportion. Use after mixing.

Size of HP graphite electrode

Item Unit HP
300-800mm
Electric resistivity Electrode μΩm 5.8-6.6
Nipple 4.2-5.0
Flexural strength Electrode Mpa 10.0-13.0
Nipple 18.0-22.0
Elastic modulus Electrode Gpa 8.0-12.0
Nipple 14.0-16.0
Bulk density Electrode ≥g/cm3 1.62-1.66
Nipple 1.74-1.80
CTE(100-600℃) Electrode x10-6/℃ 1.6-1.9
Nipple 1.1-1.4
Ash   0.3

 

Silica sand form

Silica sand is sand with SiO 2 as its main component. It has river sand, mountain sand and beach sand. It is often yellow or reddish brown because it contains some impurities.
 

Advantages of river sand as an industrial filler

The filling material of the charcoal industrial roasting furnace sometimes uses river sand. The river sand particles mined in nature are not large, generally do not need to be broken. Just wash it, remove the soil and powder particles, and then sieve and take out the required particle size to directly use the mouth. River sand is used as a baking filler.


 
Can use the river sand stove
Ring roasters generally do not use river sand as a filler, and downwind kiln and car bottom furnace (cylinder roasting) can use river sand.
 
Operation to reduce river sand mobility
In order to reduce the fluidity of river sand, river sand is sometimes mixed with calcined anthracite (or metallurgical coke powder) in a 1:1 ratio.
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