Applications - Rheology Control
Typically, when water is added to an ore, it progressively causes particles to stick together and become less dusty. Ores with a large percentage of fine particles, like clay, have a greater propensity to agglomerate as water is added and can become very “sticky” blocking conveyor transfer points. If more water is added the ore changes and becomes more like a mud mixture and flow can be re-established. This tendency to agglomerate can be a positive feature such as in pelletising, sintering and extruded brick manufacture.
Lateritic ores such as bauxite and lateritic nickel are prime examples of this phenomenon and are usually found in areas with distinct wet and dry seasons. During the dry season the ores can be dusty and need added moisture to minimise dust formation. During the transition seasons it can be difficult to manage transfer points as successively wet and dry material is handled. Various control mechanisms such as adding water or sending an alarm to control personnel can be employed to minimise the impact on key infrastructure such as overland conveyors.
Moisture contents are also critical in fine crushing of fine materials particularly where clays are present. Substantial savings can be made in wear parts through optimal moisture control.
