Iron ore roasting+magnetic separation process

Iron ore roasting+magnetic separation process

This method involves heating the ore to a certain temperature and transforming weakly magnetic iron minerals into strongly magnetic iron minerals in a reducing or neutral atmosphere, and then recovering the iron minerals using magnetic separation. It is the best method for handling siderite.

Iron ore roasting+magnetic separation process flow

  • 1.Raw material preparation:Crush and grind the raw ore to achieve a certain particle size requirement for the subsequent roasting process.
  • 2.Roasting:The crushed ore is sent into a roasting furnace and roasted at a certain temperature (usually between 800 ° C and 1200 ° C) and a specific atmosphere (reducing atmosphere or neutral atmosphere). During the roasting process, weakly magnetic iron minerals undergo chemical and physical changes, transforming into strongly magnetic iron minerals.
  • 3.Cooling:The roasted ore needs to be cooled for subsequent magnetic separation treatment. The temperature of cooled ore usually drops to room temperature.
  • 4.Magnetic Separation:Send the cooled ore into a magnetic separator for magnetic separation treatment. The magnetic separator generates a magnetic field to attract and separate strong magnetic iron minerals, thereby achieving the recovery of iron minerals.
  • 5.Concentrate Treatment:The concentrate after magnetic separation is further processed, such as washing and drying, to remove impurities and increase iron content. The processed concentrate can be used as a raw material for iron in fields such as steel production.
  • 6.Tailings Treatment:After magnetic separation, tailings can be treated, such as grading, concentration, etc., and can be used as raw materials for building materials or other purposes, or for further resource recovery and utilization.

Technological advantages

  • 1.Improving the Quality of Iron Ore:The roasting process can change the magnetism of iron minerals, making it easier to separate them through magnetic separation and improving the quality of the concentrate.
  • 2.Increase recovery rate:Magnetic separation is an efficient separation method that can effectively separate strong magnetic iron minerals through the action of a magnetic field, improving recovery rate.
  • 3.Reduce tailings amount: Due to the strong targeting of magnetic separation, it can effectively separate useful minerals, resulting in fewer useful components in tailings, reducing the processing capacity and environmental burden of tailings.
  • 4.Strong adaptability:The roasting+magnetic separation process is suitable for various types of iron ore, especially those that are difficult to process through traditional physical beneficiation methods.
  • 5.Easy to operate:The magnetic separation equipment is easy to operate, easy to achieve automated control, and improves production efficiency and stability.
  • 6.Environmental Protection:Compared with some chemical beneficiation methods, the roasting+magnetic separation process does not use chemical agents and has a smaller impact on the environment.
  • The iron ore roasting+magnetic separation process changes the magnetic and physical properties of minerals through high-temperature roasting, and then uses magnetic separation to efficiently separate iron minerals, which has the advantages of improving quality, recovery rate, simple operation, and environmental protection.

Typical beneficiation plant

Daxigou Lingtie Iron Ore Dressing Plant: The iron grade of the ore is about 20%, mainly consisting of Lingtie iron ore, a small amount of magnetite, and pseudo hematite. The gangue minerals are mainly sericite and quartz.