Application Case of Twin-Shaft Stainless Steel Screw Conveyors in Ferric Phosphate Handling

In new energy battery material production, the post-drying conveying of ferric phosphate often faces three major challenges: wall adhesion, wear, and metal contamination. A 50,000-ton-per-year cathode material production line adopted twin-shaft stainless steel screw conveyors to achieve stable, clean, and continuous material transport.

Tailored Design for Material Characteristics

The conveyed material is dried iron phosphate powder with an approximate bulk density of 0.8 g/cm³, exhibiting high abrasiveness and sensitivity to iron content. The entire unit is constructed from 304 stainless steel, with blades undergoing nitriding hardening treatment to achieve surface hardness exceeding HV900, effectively resisting particle cutting. Replaceable wear-resistant liners installed on the inner shell walls extend equipment lifespan while reducing maintenance frequency.

Self-Cleaning via Dual-Shaft Interlocking

To address bridging and adhesion tendencies, a dual-shaft structure with equal diameters rotating in opposite directions is employed. The two screw blades interlock and mesh, simultaneously advancing material while scraping off deposits from the opposing blades. This significantly reduces residual buildup at the bottom, eliminating clogging risks at the source and ensuring continuous operation.

Sealing and Transmission Ensure Long-Term Operation

PTFE sealing strips are installed at both inlet/outlet ports and cover plates. The housing withstands pressures ≥±5000Pa, accommodating slight negative pressure conditions and effectively controlling dust leakage. The drive end employs a shaft-mounted reducer for direct connection, boosting transmission efficiency by 15%. During full-load operation at 25t/h, noise levels remain below 78dB, with no unplanned shutdowns over eight consecutive months.

This case demonstrates that for highly abrasive and viscous powders, the twin-shaft stainless steel screw conveyor offers outstanding advantages in contamination prevention, clogging resistance, and operational stability, making it a reliable choice for upgrading new energy material production lines.