Specialists of Research & Production company «Erga» have designed a comprehensive solution to improval of quality of raw materials for glass production by removal of weakly magnetic Fe₂O₃ contamination from raw products, thus reducing spendigs for expensive pre-concentrated materials. Depending on chemical and mineralogical properties of raw materials, powerful rare-earth magnet concentration equipment, produced by «Erga» LLC, allows to keep the weakly magnetic contamination content stably low, on the level required by standards and technical requirements.

Magnetic concentration equipment, designed by Research & Production company «Erga», continuosly removes metal contamination from the product flow. The concentration process consists of several separation stages . During the first stage of separation, ferrous metals are removed from the product flow by SMBM separators and weakly magnetic metals are magnetized for further easier removal. After ferrous metals were removed, separation product is fed into the high-intensity SMVI separator, where it passes through a cascade of powerful magnetic rolls (magnetic induction over 1 700 mTsl). Inside the roll separator, product is transported by a thin (for lower induction losses) but durable (for better performance with abrasive products) kevlar belt with special stuffing.

SMVI separators have a number of adjustable units, included to guarantee maximum possible separation performance at a certain flow rate - by organizing even distribution of separation product on the magnetic rolls, changhing product transportation speed, etc.

Recommendations:

• Removal of ferrous tramp metals from the product flow is required before its feeding into the SMVI separators. It is best carried out by magnetic drums (SMBM model).
• When dealing with hot products (t>=60 °C), i.e. silica sand after drying, or when it is necessary to ensure long-term separation performance for magnets, installed in environments with elevated temperatures,high-intensity SMVI separator or SmCo magnetic alloys should be used. Though more expensive, those alloys guarantee no irreversible reductions of magnetic strength, caused by exposion to elevated temperatures.
• Due to abrasiveness of many raw materials for glass production, kevlar belts are worn out and should be replaced every 1-3 months.