There are several types of Feeders. They should be selected to suit the material, feed rates and pre-sorting. The Feeder decides the magnitude of load on the crushing/process system. Therefore, then handling system load condition, and thereby its performance, is governed/controlled by the Feeder.
The type and size of a Feeder for a given application is primarily dictated by the characteristics of the material to be handled and the required capacity. The selection of a Feeder for a particular situation is not always simple, especially if more than one satisfactory solution appears possible.
Some of the criteria for choosing the proper Feeder includes:
First, consider the gradation of the material the Feeder will handle. Consider the largest lump to the smallest particle in this analysis.
Next, you want to determine the capacity of the Feeder, taking into account the design maximum, normal and minimum capacities. Determine if the feed rate is going to be fixed or variable.
Even if it is less than 1% of the total gradation, make sure you know what the largest lump size the Feeder will process.
Type of material and its characteristics
Consider the material the Feeder will process. When sizing a Feeder, it is important to know the following information about the material:
- angle of repose
You'll also want to consider if the material is free-flowing, sticky, wet or dry.
Consider the temperature of the material the Feeder will process, as well as the ambient temperature at the site in which the Feeder will operate.
Is scalping desired?
If the material is to be scalped by the Feeder, consider the desired size of the material and what percent is to pass the opening. Determine if there is one scalping size or multiple sizes.
Type of operating duty
Consider how many hours and days per week the Feeder will be operating.
Portable or stationary
Determine if the Feeder is going to be installed on a portable or stationary plant, and know if weight and size will be a factor.
Consider the space that is available for the Feeder. If this is an underground mine, know if there is a limit to the size and weight that can be transported in the mine shaft or tunnel. Also consider how much space is available for maintenance.
Type of loading
Consider how the Feeder will be loaded (haul truck, wheel loader, conveyor, crusher, etc.), and know the size of this piece of equipment.
Equipment Feeder is charging
Consider the type of equipment the Feeder is charging (truck, train, conveyor, crusher, screen or scalper). Also consider the type and size of crusher or downstream equipment the Feeder is planned to feed.
What are the site amenities?
When sizing a Feeder, it is important to consider the electrical power at the site and to know if that power is line power or generator power.
Also consider the elevation and climate, as well as if you prefer a hydraulic or electric drive.