Magnetite ore is required to undergo a series of processes before being transformed into high-quality, premium magnetite concentrate. At Sino Iron, the downstream process starts at the mine pit, where ore receives primary crushing. ore is then conveyed to the concentrator, the processing hub of Sino Iron operation, where it’s put through six processing lines.
The beneficiation of iron ore includes using the biggest grinding mills in the world to produce a fine powder and mixed with water, creating a slurry mixture. Magnetite, as its name suggests, has magnetic qualities, so large magnetic separators are used at various stages through the process to separate the valuable iron from the waste material. The resulting magnetite concentrate is a premium product that grades approximately 65% Fe.
Once the concentrate is thickened it’s pumped in slurry form via the 30km pipeline to the port area, where a dewatering plant extracts the water through a series of massive press filters. The water is recycled and returned to the concentrator area circuit. The concentrate is then stockpiled, ready for shipping.
Facts & FIGURES
- Each autogenous grinding mill has a design throughput capacity of 1,566 tonnes of ore per hour.
- The ball mills use steel balls to finely grind the ore.
- 52 magnetic separators are used in each of the processing lines.
- The concentrate thickening unit is 45m in diameter.
- Four dewatering buildings, each containing seven press filters.
- Each press filter has a design capacity of 154 tonnes of concentrate per hour.