Fig. 3 illustrates the optimum feed conditions for the FM1 fine mineral spiral at a values recovery of 50% viz. low feed rate 0.8 t/h and feed pulp density of 35 36 %solids. The benefits of using the FM1 spiral for the treatment of fine grained silica sand, tin tailings, iron ore and copper were also investigated .
New spirals have been developed that do not use wash water. These new units have modified cross sections and only one concentrate take off port, which is. located at the bottom of the spiral . Spiral concentrators are used for the processing of heavy mineral bearing beach deposits in Florida and Australia.
Spiral classifier. Another mechanical classifier is the spiral classifier. The spiral classifier such as the Akins classifier consists of a semi cylindrical trough inclined to the horizontal. The trough is provided with a slow rotating spiral conveyor and a liquid overflow at the lower end.
Use of spirals breaking new ground in minerals of the future Traditionally, spiral concentrators have not been widely employed in the separation process of minerals like copper, lithium, tin and tantalite, but all that is changing fast, according to Graeme Smith, application representative at Multotec Process Equipment.
The mineral size recovery curves of roughing, cleaning and re cleaning spirals from two Canadian iron ore processing plants are estimated using the results of several sampling campaigns. A similar behavior of the spirals is observed in both plants in spite of the fact that the plants use different types of spirals.