In the smelting production of submerged arc furnaces for ferroalloys, calcium carbide, and other applications, electrode paste serves as the core material for self-baking electrodes. Its quality directly determines smelting efficiency and operational costs. Also known as Söderberg electrode paste, this carbonaceous product is manufactured by blending carbon-based materials with binders. Unlike other carbon products, its forming process is not completed in a single step at the factory. Instead, it undergoes a unique sequence: pre-forming, loading into electrode casings, and subsequent self-baking within the electric furnace. As a specialized supplier deeply rooted in the carbon metallurgy sector, Henan Rongxin Carbon has accumulated extensive expertise in the forming technology of electrode paste.
The Forming Characteristics of Electrode Paste
1
Diverse Pre-formed Shapes
Electrode paste is not shipped as loose powder but is pre-formed into specific shapes to facilitate transportation and feeding operations. Common forms include egg-shaped, trapezoidal, and cylindrical blocks. Henan Rongxin Carbon supplies various specifications of electrode paste products to meet the diverse requirements of feeding systems in different submerged arc furnaces.
2
Rigorous Particle Size Grading
The strength, electrical conductivity, and oxidation resistance of electrode paste largely depend on the particle size distribution of its aggregates. High-quality electrode paste employs a multi-stage grading system, where raw materials are crushed and screened into several fractions:
20-30mm
12-20mm
8-12mm
4-8mm
0-0.075mm
This "coarse-fine matching" gradation design enables the paste to achieve optimal dense packing after softening, resulting in a self-baked electrode with high strength and excellent conductivity.
3
Precise Kneading and Forming Process
The proportioned dry aggregates are thoroughly mixed with heated, molten coal tar pitch binder in a kneading pan. The kneading temperature must exceed the softening point of the binder by at least 70°C.
Henan Rongxin Carbon utilizes authentic Taixi anthracite from Ningxia as the primary raw material, valued for its low volatile matter, low ash content, and high fixed carbon. Combined with a superior binder system, this ensures the electrode paste exhibits excellent fluidity upon heating and softening, allowing it to fully fill the cross-section of the electrode casing and prevent operational issues such as hanging paste.
In Summary: The forming of electrode paste is a precision process centered on "Particles and Temperature."
As a leading supplier of carbon metallurgical materials, Henan Rongxin Carbon strictly controls every stage of production—from aggregate gradation to kneading and forming. With an annual output reaching 200,000 Tons and products exported worldwide, selecting the right electrode paste provides a crucial "dual safeguard" for the stable and efficient operation of your submerged arc furnace.
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