Two screens that decide which pellet enters the kiln
Pellet Plant No. 1 “Hernán Quivera” is the heart of pellet production for the national steel industry. After a rigorous selection, Ferrominera's specialists chose Metal 7's Canadian technology to replace two roller screens. RELANSA supplied, installed and inspects it.
450
T/H PER SCREEN
TECHNOLOGY BY
Metal 7 (Canadá)
Mining & Material Handling
01
THE CHALLENGE
Pellets leaving the balling discs must be classified precisely: only those of optimal size may advance to induration in the rotary kiln. Off-spec material must return to the system without overloading the kiln or going to waste.
02
THE SOLUTION
Replacement of two Metal 7 Single Deck Roller Screens (SDRS): 86 high-strength stainless steel rollers per screen, A-19 tungsten carbide anti-wear coating and variable frequency drives to adjust roller speed to the ore. RELANSA, as local contractor, executed the installation and technical services under the supervision of Metal 7 specialists.
03
THE IMPACT
450 t/h nominal per screen with 90% fines removal and automatic reprocessing of off-spec material. Strict control of the gap between rollers ensures the size distribution Ferrominera's customers require; A-19 extends replacement intervals versus carbon steel or chromed rollers, and the gentle rotation protects green pellets. Sealed design: less dust and under 85 dB.
// ROLLER SCREEN INSPECTION: WHAT RELANSA CHECKS ON SITE
Checklist from RELANSA's technical visit to Ferrominera's Pellet Plant.
- —Roller gap measured with feeler gauges at three points (drive end, center, free end); typical tolerances of 14–16 mm for oversize and 6.5–8 mm for fines
- —Roller profile and surface wear (smooth, grooved or chromed): abrasion channels widen the gap
- —Cracks, bowing and coating detachment, with non-destructive testing (dye penetrant) where structural damage is suspected
- —Bearings and pillow blocks: grease leaks, temperature, noise and internal play
- —Shaft alignment, chains and sprockets, belt tension, gearbox oil and keys
- —Lower scrapers: effective roller cleaning without excessive wear
- —Frame, discharge hoppers and anchor-bolt torque
// TECHNOLOGY BY
Metal 7
VIEW PARTNER →World specialist in high-performance thermal coatings for pellet plants: 47 plants equipped across 17 countries. Its A-19 technology multiplies roller service life. From Sept-Îles, Québec, with RELANSA as exclusive representative in Venezuela.
// GALLERY
1 PHOTO // ACTUAL PROJECT PHOTO
