The Compressive Strength of rocks is measured by crushing cylinder shaped ore samples of 2 x 2 . This techniques allows for a rock to rock relative comparison. The Bond Crushing Work Index is common to calculate the power needed to crush rocks from a given F80 size to a resulted P80 product size.
The goal of crushing is to produce mineral fractions of required particle for subsequent benefication process. The quality parameters are usually hardness, size and shape. The figure shows the different size reduction stages from 1000mm to 4mm. The reduction in ore size is to liberate valuable minerals from the host rock.
Design and Construction of Rock Crushing Machine from Locally Sourced Materials for Indigenous Use Introduction Crushing is one of the preliminary stages in mineral processing from the ore. The process is required to reduce rocks and lumps to smaller pieces. Rollers or jaw crushers are employed in this situation.
The crushing and grinding process will produce a range of particles with varying degrees of liberation . Any particles that exceed a target size required for physical separation or chemical extraction are returned to the crushing or the grinding circuit. Figure 2.
the background light clearly visible. An example of standard opacity levels is illustrated by Figure 1 1. The more dust or PM generated, the more difficult it is to see the landscape background. Figure 1 1: Opacity Levels . Michigan Environmental Compliance Guide for Mineral Crushing Facilities