Cathode Carbon Block

Short Description:

Cathode blocks are used for the masonry lining of aluminum electrolytic cells. As a positive electrode conductive carbon material, it has the characteristics of high-temperature resistance, molten salt corrosion resistance, and good conductivity. There are many types, including ordinary carbon cathode block, semi-graphite carbon block, high-graphitic carbon block, and graphitized cathode block.

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Cathode Block Overview

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Product Name: Cathode carbon block

Brand Name: QF

Resistance (μΩ.m): 9-29

Apparent Density (g/cm³ ): 1.60-1.72

Flexural Strength (N/㎡): 8-12

Color: Black

Material: high quality petroleum coke and needle coke

Size: as customer requirement

Application: Electrolytic aluminum

real density: 1.96-2.20

ASH: 0.3-2

sodium expansion: 0.4-0.7

Packaging Description: Packing with wooden cases and steel belt.

Specification

Specifications	Unit	Test method	Value
Specifications	Unit	Test method	30%GraphiteAddad	50%Graphite Added	Graphitic Grade	Graphitized Grade
Real Density	g/cm	ISO21687	≥1.98	≥1.98	≥2.12	≥2.20
Apparent Density	g/cm	ISO12985.1	≥1.60	≥1.60	≥1.62	≥1.62
Open Porosity	%	ISO12985.2	≤16	≤16	≤18	≤20
Total Porosity	%		≤19	≤19	≤23	≤27
Compressive Strength(or Cold Crushing Strength)	MPa	ISO18515	≥26	≥26	≥26	≥20
Flexural Strength	MPa	IS012986.1	≥7	≥7	≥7	≥7
Specific Electrical Resistivity	uom	ISO11713	≤35	≤30	≤21	≤12
Thermal Conductivity	W/mk	IS012987	≥13	≥15	≥25	≥100
Coefficient of Linear Thermal Expansion	106/K	ISO14420	≤4.0	≤4.0	≤4.0	≤3.5
Ash Content	%	ISO8005	≤5	≤3.5	≤1.5	≤0.5
Sodium Expansion(or Rapoport Swelling or Swelling by Alkali)	%	ISO15379.1	≤0.8	≤0.7	≤0.5	≤0.4