Iron ore dryer, also known as mineral dryer, is a kind of rotary drum dryer.
It is available in handling
a large number of bulk materials, such as limestone, clay, coal powder, fly ash, slag, metal
concentrate, tailings, and other materials that have certain humidity. The iron ore dryer features
reliable and simple operation, strong adaptability, and large processing capacity, widely used in
metallurgy industry, chemical plant, power plant, mine industry, cement plant, etc.
In iron ore pelletizing plants, the iron ore dryer is one of the important pelletizing equipment. During
the production process, the raw material (iron ore concentrate) moisture is generally between 11% –
15%. Before they are fed into the pelletizing disc, they should be dehydrated firstly. The main
function of the dryer is to remove water from the iron ore concentrate. The second is to mix the
added auxiliary material (bentonite) with the iron ore concentrate by using the cylinder rotation so
as to facilitate the smooth progress of the next process.
Iron Ore Dryer Working Principle:-
The iron ore dryer is mainly composed of a rotary cylinder, transmission device, reducer, supporting
device, sealing device, lifting flights, self-cleaning device, conveying device, etc.
The main body of the iron ore dryer is a slightly inclined and rotatable cylinder. Wet materials enter
from the higher end through a feeding pipe and move continuously to the discharge port at the
other end. In this process, the wet material directly or indirectly exchanges heat with the heat
carrier to achieve the purpose of drying and then discharged through a belt conveyor or screw
conveyor.
Usually, the heat carrier enters from the lower end and contacts the material in a counter current.
However, it can also flow into the cylinder in parallel with the material.
The inner wall of the cylinder is equipped with several lifting flights, which are used to throw up and
scatter materials. It enlarges the contact surface between the material and heat carrier for
increasing the drying rate and promoting forward movement.
The heat carrier is generally divided into hot air, flue gas, and so on. After heat exchange, the
material particles it carried should be filtered out by a cyclone dust collector. If it is necessary to
further reduce the dust content, a pulse jet bag filter is a good choice.
