30+ YEARS OF EXPERIENCE IN CARBON INDUSTRY

  Ash content is the inorganic residue (mainly metal oxides and inorganic salts such as SiO₂, Al₂O₃, CaO, and MgO) remaining after complete combustion of electrode paste under specified conditions, expressed as a percentage by mass. Key factors affecting the ash content of electrode paste include: raw material purity, production process, and the quality of auxiliary materials.

  The ash content of raw materials for electrode paste production, such as calcined anthracite, graphite, and coke, is the core determining factor. Incomplete raw material sorting introduces impurities; metal scraps generated from equipment wear during production, impurities mixed in during batching, and incomplete combustion of residual carbon due to insufficient calcination all increase the ash content of the electrode paste. Additionally, the ash content of auxiliary materials such as binders (coal tar pitch) and the purity of additives also play a role.

   The impact of high ash content in electrode paste on its use is reflected in the following aspects:

   Conductivity: Inorganic impurities in ash are insulating or low-conductivity substances. Higher ash content results in poorer conductivity of the electrode paste, leading to increased power consumption and severe electrode overheating during use.

  High-Temperature Stability: Ash easily melts at the high temperatures of an electric arc furnace, forming low-melting-point compounds. This results in a loose electrode paste structure, reduced thermal shock resistance, and increased susceptibility to electrode breakage and accelerated oxidation.

Product Quality: Excessive ash content contaminates smelted products (e.g., reduced alloy purity), particularly significantly impacting the smelting of high-quality steel/ferroalloys.

Consumption Rate: Increased ash content reduces the density of the electrode paste, accelerating electrode oxidation and erosion, and increasing the electrode consumption rate.

To produce high-quality electrode paste with low ash content, Rongxing strictly controls and selects raw materials, using low-ash electric calcined anthracite, calcined petroleum coke, graphite powder, and other raw materials. We have established ash content testing standards for incoming raw materials; optimized raw material crushing and screening processes to prevent equipment wear and impurities from entering; and used closed equipment in the batching and mixing stages to prevent external impurities from entering. Each batch of semi-finished/finished products is tested for ash content, and batches exceeding the standard are prohibited from leaving the factory, allowing for tracing back to raw materials or process issues.