The term "limonite" is not a mineral species name but usually is
goethite and water goethite's collectively.Because these small
mineral particles, it is difficult to distinguish, so collectively
referred to as limonite.Limonite iron content is less than the
magnetite and hematite, but because it is loose and easy to
smelting, it is also an important iron ore.The following is a
limonite beneficiation line process.
1. limonite high intensity magnetic separation
With the development of new and efficient dry and wet high
intensity magnetic separation equipment, high intensity magnetic
separation process is simple,easy to operate, the popularization
and application, but marginally improve the quality of the
concentrate, and for-20um iron mineral recovery rate is poor.
For example, the iron ore mined the limonite ore grade of about
46%, was processed by the two-stage crushing, two-stage screening
output-25mm +10 mm and-10mm two broken products, rare earth
permanent magnet strong magnetic separator roller dry magnetic
separation operation process.
Production proved that -25 mm +10 mm grain is available to obtain
iron grade of 52.00% of the bulk concentrate, -10 mm grain more
than 50% of the powdered concentrate, comprehensive recovery rate
of 85.00%above, the resulting the mine resource utilization
increased by 11 percentage points.Limonite concentrator generated
grading 0.315 to 0.04 mm granular products by crushing - Wind used
strong magnetic separator magnetic roller for magnetic separation,
from 28.00% to 29.00% of the grade iron ore, concentrate iron grade
may be raised to 42.00%.
2. Limonite Selective flocculation - intensity magnetic separation
For low-grade fine disseminated limonite, only finely ground in
order to obtain high-grade iron ore concentrate, while at the same
time will produce mud phenomenon, which led to lower recovery.The
selective flocculation - intensity magnetic separation process can
significantly improve the recovery of micro-fine iron minerals, to
overcome the shortcomings of strong magnetic separator selected
micro-fine iron minerals poor.The key technologies of the
implementation of the process is selective dispersion the
flocculation of control and strong magnetic separator sorting
conditions (mainly to the mine, and rinse water).
3. Limonite Restore magnetic roasting - low intensity magnetic
Restore magnetization roasting - low intensity magnetic separation
processing limonite is more effective method, but due to the higher
cost of the beneficiation process, which has not been widely used,
especially magnetic roasting of limonite basic technicalindustrial
applications.Foreign iron ore fluidized bed furnace and kiln
magnetic roasting technology, limonite fluidized bed furnace-stage
magnetic roasting, roasting the ore particle size of 30mm, about
39.00% of the iron grade, roasted ore grinding - magnetic
separation, the concentrateiron grade of 61.00%, the recovery rate
of 70.00% or more.