Pyrite (Fe! In a Pyrite Benefication Process the pyrite ore is crushed in the secondary jaw crusher of a and classified using a circulator vibrating screen. The crushed ore is dassified using a 6mm wibrating screen to separate the oversized material so that it can be returned to the crusher. The sieve analysis of a sample of the crushed product is given in the table below: A constant volume shape factor of 0.98 may be assumed for the crushed particles fed to the classifying screen. Question 1 (11 marks) 1. The crushed pyrite particles have a regular cuboid shape with average side lengths of 1.2mm. Looking at a single particle, answer the following questions: 1.1. Calculate the equivalent surface-volume diameter of the pyrite particle. (4) 1.2. Calculate the specific surface ratio for this pyrite particle. Compare this calculated value with the value obtained from Figure 1.1 in the formula sheet. (5) 1.3. Calculate the sphericity of the pyrite particle. (2)