Ceramic Fiber and Rock Wool Electric Fiber Formation: Molybdenum Electrode Selection

1. Ceramic Fiber and Rock Wool: Fiber Formation Paths in Aluminosilicate Melts

Ceramic fiber (aluminosilicate fiber) and rock wool both belong to the aluminosilicate family of high-temperature fibrous materials: the former is mostly used for industrial furnace linings and petrochemical heater insulation, while the latter is common in building and industrial insulation. The two follow similar paths in melting and fiber formation: raw materials are melted in a resistance furnace or electric melting furnace to form a high-temperature melt, which is then drawn into fiber by spinning or blowing. Temperature stability in the melting stage directly affects fiber diameter uniformity and shot content, which is the practical reason why melting equipment has shifted from flame pool furnaces to electric melting furnaces in recent years.

2. Two Core Requirements That Electric Fiber Formation Places on Molybdenum Electrodes

Aluminosilicate melts run hot and viscous and are strongly corrosive to electrode materials. Electric fiber formation places two main requirements on molybdenum electrodes: resistance to melt corrosion, so that the electrode does not wear out too quickly and disrupt continuous production; and a dense structure with thermal shock resistance, to withstand the thermal stress of heating up and cooling down during shutdowns. In aluminosilicate melts, molybdenum electrodes corrode relatively slowly and generally do not noticeably affect fiber whiteness, which is why they are widely used in ceramic fiber and rock wool electric melting furnaces.

3. Points to Watch in Selection and Use

• Current density: Depending on melt composition and furnace type, keep the operating current density within 1–3A/cm² and leave adjustment margin.
• Immersion depth: Check the immersed section of side-inserted electrodes regularly and adjust the insertion depth in good time to avoid end oxidation or overheating.
• Batch replacement: Mixing new and old electrodes easily causes drift in power distribution and the temperature field, so schedule replacements by batch.
• Heating and cooling rates: Control the heating rate and the cooling rate during shutdowns to reduce thermal stress damage to the electrodes.

Electrode specifications (rod Φ20–100mm or custom plate) must be determined in conjunction with the furnace ports and water-cooling conditions.

4. Regional Support and Supply Methods

Ceramic fiber and rock wool are important electrode applications, with production regions spread across Shandong, Hebei, Jiangsu, Henan, Liaoning, Inner Mongolia and elsewhere. These companies mostly aim for continuous operation and are sensitive to batch consistency and delivery dates; technical upgrades are usually tied to furnace repair windows, so local technical contact and volume stocking matter a great deal.

5. Discussing the Scheme

For electrode selection and specifications in ceramic fiber and rock wool electric fiber formation, see Ceramic Fiber Furnace Electrodes.

You can submit the furnace type, melt composition and current operating parameters, and we will make recommendations based on current density and cooling conditions.